Patent Application
20100039159
This application is based upon and claims the benefit of priority from the prior Japanese Patent Application No. 2008-208841, filed on Aug. 14, 2008; the entire contents of which are incorporated herein by reference.
1. Field of the Invention
The present invention relates to a control device and a control method generating a control signal based on, for example, a weak signal.
2. Description of the Related Art
A remote-control device and a control device controlling a home electric appliance such as a TV generally use a technique of optical communication being one-way communication. Specifically, the remote-control device emits an optical signal or the like, and the control device built in a TV obtains a control signal by receiving the optical signal and changing the signal into an electrical signal.
Such a remote-control device and control device consume so-called standby power since there is a need to constantly operate a light-receiving part of the control device. Further, since the light-receiving part is driven, when a regulator is provided in the control device, a power loss in the regulator becomes larger than power consumption of the light-receiving part itself, resulting that power consumption as a whole control device may become large.
Accordingly, it is proposed to drive the control device using batteries and directly use a signal obtained by rectifying a received wave for generating the control signal (refer to, for example, JP-A2005-295289 (KOKAI)). However, a rectifier rectifying the received wave generally has a low sensitivity, so that an amplifier is required to enhance the sensitivity of rectifier. The amplifier consumes electric power, which results in placing a burden on the batteries of the control device.
As described above, in the control device generating the control signal based on an instruction signal from the remote-control device, there is a problem that the power consumption of the whole control device (especially a receiving front-end including the amplifier) is increased when the sensitivity for receiving light or the like from the remote-control device is tried to be enhanced.
The present invention has been made to solve such problems, and an object thereof is to provide a control device and a control method capable of suppressing power consumption while enhancing a sensitivity for receiving a signal from a remote-control device.
In order to achieve the aforementioned object, a control device according to one aspect of the present invention includes: a rectifier to rectify a received signal; an amplifier having an amplifying element to amplify the signal rectified by the rectifier and an assisting element being connected to the amplifying element to assist the amplifying element; a determination unit to determine presence or absence of the signal amplified by the amplifier; and a controller to control the connection of the assisting element with the amplifying element at a predetermined timing.
Further, a control method according to another aspect of the present invention is a control method of a control device including a rectifier to rectify a received signal, an amplifier having an amplifying element to amplify the signal rectified by the rectifier and an assisting element being connected to the amplifying element to assist the amplifying element, a determination unit to determine presence or absence of the signal amplified by the amplifier, and a controller to control the connection of the assisting element with the amplifying element at a predetermined timing, the control method is characterized in that it includes: searching, with the controller, an optimum first connection number of the assisting element with the amplifying element for enhancing a sensitivity of the amplifier; controlling, with the controller, the connection number of the assisting element with the amplifying element to be the first connection number at the predetermined timing; and controlling, with the controller, the connection number of the assisting element with the amplifying element to be a second connection number other than the first connection number.
In a control device according to an embodiment of the present invention, a remote-control device transmits an instruction signal using a radio wave, and the control device receives the instruction signal and generates a control signal controlling a controlled object such as a TV. A medium for transmitting the instruction signal is not limited to the radio wave, and an optical signal such as infrared ray can also be used, for instance. The control device driven by batteries or the like rectifies the received instruction signal, determines presence/absence of the instruction signal, and outputs the control signal when the instruction signal is determined to exist.
The instruction signal is normally weak, so that if it is only rectified, it is difficult to obtain a signal whose magnitude is sufficient enough for the determination. Accordingly, the control device of this embodiment amplifies a rectified signal being the rectified instruction signal using an amplifier, and determines presence/absence of the instruction signal based on the magnitude of the amplified signal. However, when the amplifier is constantly in a high sensitivity state, the burden on the batteries which drive the control device becomes large, resulting that a continuous operation time of the control device itself is reduced. Accordingly, in the control device according to the embodiment of the present invention, by suppressing power consumption of the entire control device by controlling the state of amplifier, it is possible to perform control with high sensitivity and low power consumption.
Concretely, a system for changing the sensitivity of amplifier in a time division is realized. Namely, time is divided into a time with high sensitivity and a time with low sensitivity. Although the power consumption during the time in which the amplifier operates with high sensitivity is high, since it is configured that a shoot-through current is reduced during the time in which the amplifier operates with low sensitivity, the power consumption during the time is lowered. In the embodiment to be described hereinbelow, it is designed such that a time (time for correction operation) Tc during which the high sensitivity and the low sensitivity are recognized is provided at the time of initial setting after a power supply is turned on, the recognition is performed, and then, two states of high sensitivity time TH and low sensitivity time TL are periodically operated.
Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings. As shown in
The remote-control device 2 includes: an instruction signal generating section 70 generating the instruction signal; a transmitting section 80 transmitting the generated instruction signal to the control device 1; and an antenna section 90.
The antenna section 10 receives the instruction signal from the remote-control device 2. For the antenna section 10, the one suitable for the medium with which the remote-control device 2 transfers the instruction signal can be used. For example, if the remote-control device 2 transmits the instruction signal using a radio wave, the antenna section 10 becomes an antenna for receiving the radio wave, and if the remote-control device 2 transmits the instruction signal using light such as infrared ray, the antenna section 10 can be realized by a light-receiving element or the like.
The rectifier 20 is a functional element having a rectification action, and a semiconductor element such as a diode and a transistor can be used, for instance. Since the rectifier 20 rectifies a weak signal received by the antenna section, it is preferably a low-loss rectifier.
In an example shown in
The amplifier 40 amplifies the signal rectified by the rectifier. The amplifier 40 has a function of enhancing an accuracy of determination (enhancing a sensitivity of determination) made by the determination section 50 by correcting a strength and weakness (correcting a variation) of the instruction signal due to variation of elements in production. A timing at which the variation is corrected is controlled by the control section 60.
As shown in
Since the current source I1 is provided, a threshold voltage necessary for M1 to operate is applied to M1. Accordingly, the sensitivity is increased. What is adjusted is a voltage of Vo1, and a magnitude of current flowing through an inverter formed of M10 and M11 less than a current flowing through M02, M2 and M1. Therefore, by performing a time division operation of the sensitivity using the present circuits, it is possible to remarkably reduce the power consumption.
The rectified output of the rectifier 20 is input into an input of the current mirror circuit formed of M02 and M1 (gate of M1), and output from the drain of M1 as a current. A gate of M4 is connected to a gate of M3. The gate of M2 is biased. As a result, an amplified output voltage Vo1 is generated at a connection point between M4 and M1. Note that a capacitor C whose one end is grounded operates to stabilize a voltage VM1 generated due to an input-output characteristic of M02. At the other end of the capacitor C, a drain and a gate of an n-type MOSFET (M03) whose source is grounded are connected.
If there is no input into the antenna section 10, a gate voltage VM1 of M1 becomes basically a threshold voltage. A current I2 is copied to M4 by current mirrors MX2 to M2 and M3 to M4. If no element variance exists in the transistors forming the current mirrors, the current flowing through M1 and the current flowing through M4 become substantially the same, and Vo1 takes a voltage of about VDD/2. When the current sources I1 and I2 are not provided, the gate voltage VM1 of M1 becomes a ground potential, but, if a fine CMOS is applied, a leakage current is flown when a voltage is applied between the drain and the source. This current results in an input offset, so that there is a need to introduce a mechanism to offset the leakage current to enhance the sensitivity. M2 operates to generate a leakage current which simulates the leakage current flown through M1 when no signal is input into the antenna section 10. M3 and M4 form a current mirror circuit, and a current which compensates the leakage current of M1 is output from M4. Accordingly, Vo1 becomes a voltage of about VDD/2 when no signal is input.
In this embodiment, the amplifier 40 further includes a circuit which fine-adjusts an offset caused by a variation of element characteristics of M1 to M4. Namely, as shown in
The determination section 50 determines presence/absence of the instruction signal based on the output signal of the amplifier 40. In an example shown in
The switch section 30 is inserted between the rectifier 20 and the amplifier 40. The switch section 30 cuts-off a signal to be input from the rectifier 20 to the amplifier 40, and enables the offset adjustment of the amplifier 40. As described above, the amplifier 40 has the circuit to adjust the offset caused by the variation of elements, but, the adjustment cannot be correctly performed in a state where the input signal exists. The switch section 30 cuts-off the input to the amplifier 40 at the time of such offset adjustment (calibration). Note that the opening/closing operation of the switch section 30 is controlled by the control section 60.
The control section 60 has a function of controlling the offset adjustment of the amplifier 40 as well as controlling a gain adjustment of the amplifier 40. The control section 60 includes a control signal generating part 61 generating a control signal based on the determination result made by the determination section 50, a clock 62 giving a control timing, a calibration control part 63 (CAL control part) controlling the offset adjustment of the amplifier 40, an amplifier control part 64 controlling the gain adjustment of the amplifier 40, and a memory 65 storing a timing of the offset adjustment and the gain adjustment and the like. The control section 60 is realized by a CPU, a memory or the like. Note that the memory 65 can store not only operation procedures of the CAL control part 63 and the amplifier control part 64 but also the states of switches SWb1 to SWb2 and SWc1 to SWc2 shown in
The remote-control device 2 includes the instruction signal generating section 70, the transmitting section 80 and the antenna section 90. The instruction signal generating section 70 is connected to a not-shown input section, and generates a predetermined instruction signal based on an instruction from a user. The transmitting section 80 generates a transmitting signal by modulating a high-frequency signal or the like according to the generated instruction signal. The antenna section 90 transmits the transmitting signal generated by the transmitting section 80. The transmitting section 80 and the antenna section 90 can be changed in accordance with a medium for transmitting the instruction signal. For instance, if an infrared ray is used, the transmitting section 80 and the antenna section 90 can be realized by being combined with an infrared-emitting diode or the like.
The remote-control device 2 transmits an ID signal corresponding to the control device as an instruction signal. When the ID signal from the remote-control device 2 transmitted as the instruction signal is the same as an ID of the control device, and power supply of a controlled device 5 is cut off, the control device 1 generates a control signal to release the cut-off state of the power supply, and supplies power to the controlled device 5. Meanwhile, when the transmitted ID signal is the same as the ID of the control device, and the controlled device 5 is already operated, the control device 1 turns off the power supply of the controlled device 5 and generates, at the same time, a control signal to cut off the power supply.
Next, an operation example of a control device according to this embodiment will be explained.
The control device according to this embodiment repeats three operating states of (1) correction operation (calibration operation), (2) high sensitivity operation and (3) low sensitivity operation, and stands ready to receive the instruction signal from the remote-control device 2. Specifically, by repeating the high sensitivity operation with high sensitivity and large power consumption, and the low sensitivity operation with inferior sensitivity yet suppressed power consumption, the power consumption as a whole is suppressed.
As shown in
When the memory 65 is initialized, the CAL control part 63 turns off the switch section 30 (S105). By turning off the switch section 30, the amplifier 40 is made to be in a state where no signal is input therein. This state is suitable for correcting the offset caused by the variation of M1 to M4. Note that although a switch SWa1 is serially connected between the rectifier 20 and the amplifier 40 in an example shown in
When the switch section 30 is turned off, the CAL control part 63 detects the determination result made by the determination section 50 (S110). As a result of detection, when the output Vo of the determination section 50 is not H (No in S115), the CAL control part 63 adds 1 to the variable x (S120), and detects whether or not the connection number m of the switches SWb1 to SWb2 is zero (S125). If m is not zero (No in S125), one of the switches SWb1 to SWb2 is turned off to thereby decrease the connection number m of M2b-1 to M2b-2 by one, and if m is zero (Yes in S125), 1 is added to the connection number n of M3c-1 to M3c-2 (S135). Specifically, if the determination result made by the determination section 50 is not H, the sensitivity of amplifier 40 does not reach the maximum, so that the connection number m of M2b-1 to M2b-2 where the parallel connection number is the maximum in the initial state is decreased by one. Meanwhile, if the connection number m of M2b-1 to M2b-2 is zero, which means a state where only M2 exists, so that at this time, the connection number of M3c-1 to M3c-2 is increased by one. In this manner, a processing is conducted in which the connection number m of M2b-1 to M2b-2 is decreased, and after m becomes zero, the connection number n of M3c-1 to M3c-2 is increased until the output Vo of the determination section 50 becomes H.
After increasing/decreasing the connection number m of M2b-1 to M2b-2 and/or the connection number n of M3c-1 to M3c-2, the CAL control part 63 detects the determination result made by the determination section 50 again (S110). When the output Vo of the determination section 50 is not H, steps 120 to 135 are repeated (No in S115).
When the output Vo of the determination section 50 is H (Yes in S115), the CAL control part 63 stores the connection number m of M2b-1 to M2b-2 and the connection number n of M3c-1 to M3c-2 corresponding to the state where the variable x is decreased by one, in the memory 65 as a high sensitivity state. Namely, by setting the state right before the output Vo of the determination section 50 becomes H as the high sensitivity state, the CAL control part 63 stores the corresponding connection number m of M2b-1 to M2b-2 and connection number n of M3c-1 to M3c-2 (S140).
In addition, by setting a state with lower sensitivity than the high sensitivity state made by the connection number m of M2b-1 to M2b-2 and the connection number n of M3c-1 to M3c-2 as a low sensitivity state, the CAL control part 63 stores the corresponding connection number of M2b-1 to M2b-2 and connection number of M3c-1 to M3c-2. In examples shown in
Operations from S105 through S140 correspond to the aforementioned correction operation. Though this correction operation, a combination of switches SWb and SWc making the state of high sensitivity where the offset caused by a variation between the elements of M1 to M4 is removed, and the state of low sensitivity where the sensitivity is lower than that in the high sensitivity state to suppress the power consumption, can be stored in the memory.
Subsequently, the CAL control part 63 turns on the switch section 30 (S145). Accordingly, the rectifier 20 and the amplifier 40 are connected, and the control device 1 becomes a receiving state.
When the CAL control part 63 turns on the switch section 30, the amplifier control part 64 reads the connection numbers m and n making the state of high sensitivity from the memory 65, controls the corresponding switches SWb1 to SWb2 and SWc1 to SWc2 of the amplifier 40, and maintains the state for a predetermined period of time TH (S150). The predetermined period of time TH can be decided by the amplifier control part 64 based on a time signal from the clock 62.
Next, the amplifier control part 64 reads the connection numbers m and n making the state of low sensitivity from the memory 65, controls the corresponding switches SWb1 to SWb2 and SWc1 to SWc2 of the amplifier 40, and maintains the state for a predetermined period of time TL (S155). The predetermined period of time TL can also be decided by the amplifier control part 64 based on the time signal from the clock 62.
After the predetermined period of time TL elapses, the amplifier control part 64 determines how much time has elapsed since the CAL control part 63 completed the correction operation (how much time has elapsed since the processing was received from the CAL control part 63) (S160). As a result of determination, if a predetermined period of time TDEF has not elapsed (No in S160), the amplifier control part 64 reads the connection numbers m and n making the state of high sensitivity from the memory 65, and maintains the state for the predetermined period of time TH (S150). Namely, until the predetermined period of time TDEF elapses, the high sensitivity state and the low sensitivity state are alternately repeated (S150 through S160).
When the predetermined period of time TDEF has elapsed (Yes in S160), the amplifier control part 64 returns the processing to the CAL control part 63, and resumes the correction operation (S105).
In this example, the correction operation is repeated each time the predetermined period of time TDEF elapses, so that even when the variation between the elements M1 to M4 is large due to the surrounding temperature change, it is possible to maintain the high sensitivity state. If there is a situation where a surrounding situation is stable and the correction operation is required to be conducted only when, for instance, the power supply is turned on, it is possible to omit step 160 and repeat only steps 150 and 155 after conducting the correction operation at steps 105 to 145.
As described above, according to the control device of this embodiment, since the high sensitivity state and the low sensitivity state are alternately repeated, it is possible to substantially suppress the power consumption in a state including the high sensitivity state. Further, since the correction operation is conducted prior to the operation in the high sensitivity state, it is possible to set a higher-sensitivity and more appropriate state of power consumption as the high sensitivity state.
Here, a relation among the instruction signal to be transmitted by the remote-control device 2 and respective operations in the high sensitivity state and the low sensitivity state of the control device 1 will be described. Since two operating states of the high sensitivity state and the low sensitivity state exist in the control device according to this embodiment, it is possible to suppress power consumption also at the remote-control device side in accordance with a distance between the remote-control device and the control device.
For instance, when the distance between the remote-control device and the control device is relatively long, there is a possibility that the control device cannot receive the instruction signal correctly unless it receives the signal in the high sensitivity state. Meanwhile, since the high sensitivity state and the low sensitivity state are alternately operated as described above, when a transmission distance is long, there is a need that the instruction signal reaches during the period of time TH in the high sensitivity state.
Meanwhile, when the distance between the remote-control device and the control device is short, the control device does not always have to be in the high sensitivity state. Namely, as shown in
Accordingly, in order to reduce the power consumption at the remote-control device side, it is only required to provide a timer to the instruction signal generating section 70 and to enable to switch the transmission time of the instruction signal. For instance, “sensitivity switching switch” is provided to the remote-control device 2, and it is configured that the instruction signal is transmitted for a period of time TH+TL when the sensitivity is set as high sensitivity, and the instruction signal is transmitted for a period of time TIDT when the sensitivity is set as low sensitivity. With such a configuration, it is possible to minimize the instruction signal transmission time transmitted by the remote-control device, resulting that the power consumption at the remote-control device side can also be reduced.
As another method of suppressing the power consumption at the remote-control device side, it is also possible to control the instruction signal transmission time in accordance with a time during which a user pushes a button or the like. For instance, a counter is provided to the instruction signal generating section 70 of the remote-control device, and a time during which the user pushes a button or the like is measured. Subsequently, the instruction signal transmission time may be decided in accordance with the obtained time.
Here, a further detailed description will be made regarding a condition of the instruction signal to be transmitted by the remote-control device 2 and the power consumption. If a period of time during which the remote-control device transmits an ID as an instruction signal is set as TIDT, a condition under which an ID signal is always received during the time TH in high sensitivity is to satisfy TIDT<TH/2 and to transmit a signal whose cycle is TIDT for one cycle (TCTL) in which a time with low gain and that with high gain are combined.
If a system in which transmission power of remote-control is 10 dBm, the power consumption of control device 1 during the time of low sensitivity and the time of high sensitivity are respectively 0.1 μW and 0.5 μW, TCTL is 1 ms and TH is 0.1 ms, is tentatively assumed, the control device 1 reduces energies as much as 0.9 ms×0.4 μW=0.36 nWs per 1 ms with the use of the time-division sensitivity control. Specifically, the power consumption of 0.36 μW is reduced.
Meanwhile, if an efficiency of a remote-control transmitter is assumed to be 33%, the energy increases as much as 10 mW×3 (efficiency)×0.9 ms=27 μWs per one time of transmission. A time TEQ required to equalize the increased energy with the energy reduced in the control device becomes 75 s obtained from 27 μWs=0.36 μW×TEQ. Specifically, the power consumption per one use of the remote-control can be compensated by 75 s. Since one day has 86400 s, if 1152 times of transmission are performed, the power consumption is offset. If considering a case where several ten times of control are normally conducted per one day, the effect on the power consumption even including the power consumption of the remote-control is large with the use of the present system.
Subsequently, another operation example of the control device according to this embodiment will be described with reference to
In this operation example, the memory 65 previously stores data shown in
As shown in
When the variable x is initialized, the CAL control part 63 turns off the switch section 30 (S105). By turning off the switch section 30, the amplifier 40 is made to be in a state where no signal is input therein. Note that similar to the operation example shown in
When the switch section 30 is turned off, the CAL control part 63 detects the determination result made by the determination section 50 (S110).
As a result of detection, when the output Vo of the determination section 50 is not L (No in S215), the CAL control part 63 subtracts 2 from the variable x (S220). If the variable x becomes negative as a result of subtracting 2, the processing is continued on the assumption that the variable x is zero. Since the correction operation is integrated in the cycle of high sensitivity state and low sensitivity state in this operation example, even after the variable x is set to correspond to the high sensitivity state as a result of correction operation, the correction operation is conducted again after the high sensitivity state and the low sensitivity state are gone through. At this time, since it is inefficient if the correction operation is conducted from the initial state, a state of being back to the low sensitivity state by increasing/decreasing the connection numbers of M2b-1 to M2b-2 and M3c-1 to M3c-2 by two from the current state is set to be the initial state. The processing to subtract 2 from x ultimately means the processing to subtract 1 from x, which will be described later.
As a result of detection, when the output Vo of the determination section 50 is L (Yes in S215) and when the value of variable x is changed in step 120 (S220), the CAL control part 63 turns on the switch section 30 (S145). Accordingly, the rectifier 20 and the amplifier 40 are connected, and the control device 1 becomes a receiving state.
When the CAL control part 63 turns on the switch section 30, the amplifier control part 64 reads the connection numbers m and n corresponding to the current variable x from the memory 65, controls the corresponding switches SWb1 to SWb2 and SWc1 to SWc2 of the amplifier 40, and maintains the state for a predetermined period of time TH (S250). The predetermined period of time TH can be decided by the amplifier control part 64 based on a time signal from the clock 62.
Next, the amplifier control part 64 reads the connection numbers m and n corresponding to a value obtained by subtracting a predetermined number N from the current variable x from the memory 65, controls the corresponding switches SWb1 to SWb2 and SWc1 to SWc2 of the amplifier 40, and maintains the state for a predetermined period of time TL (S255). The predetermined period of time TL can also be decided by the amplifier control part 64 based on the time signal from the clock 62.
After the predetermined period of time TL elapses, the amplifier control part 64 adds 1 to the variable x, and returns the processing to the CAL control part 63. The CAL control part 63 resumes the correction operation (S105).
In this operation example, the variable x is increased by one at a time until the amplifier 40 becomes in the high sensitivity state, and the correction operation, the high sensitivity state and the low sensitivity state are repeated during the period of time. Subsequently, when the amplifier 40 becomes in the high sensitivity state, 2 is subtracted from the variable x, and the operation is repeated again in such an order of the high sensitivity state, the low sensitivity state and the correction operation. Specifically, the amplifier 40 searches the connection numbers m and n constantly making the high sensitivity state, so that ultimately, its high sensitivity state is constantly maintained in a state being approximate to the best state. Therefore, even in a state where the surrounding environment is likely to change, it is possible to suppress the power consumption while constantly maintaining the high sensitivity.
Although there is few chance that the characteristic is largely changed due to a difference in the designation of order of the correction operation, the high sensitivity state and the low sensitivity state, there is a convenient order depending on determination criteria. For instance, if a setting after the determination is set to be the high sensitivity side as compared to the last time, it is preferable, in terms of the low power consumption, to provide a time zone of high sensitivity after the correction operation and provide a time zone of low sensitivity after that, because the change in the setting becomes small so that a transition due to the setting change becomes small. Regarding the decreased amount of power consumption realized by this operation example, if the correction operation time, the time during which the sensitivity is set to be the high sensitivity, and the time during which the sensitivity is set to be the low sensitivity are respectively set as TC, TH and TL, the power consumption can be reduced to (TC+TH)/(TC+TH+TL) as compared to a case where the sensitivity is constantly set to be the high sensitivity state.
Subsequently, still another operation example of the control device according to this embodiment will be described with reference to
In the operation example shown in
Accordingly, in the operation example to be described hereinbelow, by switching a mode in which three states of the calibration, the high sensitivity state and the low sensitivity state are set to be one cycle and a mode in which two states of the high sensitivity state and the low sensitivity state are set to be one cycle, the period of time TH is relatively controlled. Concretely, when the power supply is turned on, the mode shown in
Namely, in the operation example shown in
Also in the example shown in
As shown in
When the internal variables are initialized, the CAL control part 63 turns off the switch section 30 (S305). By turning off the switch section 30, the amplifier 40 is made to be in a state where no signal is input therein.
When the switch section 30 is turned off, the CAL control part 63 adds 1 to the internal variable ncpath (S310), and detects the determination result made by the determination section 50 (S315).
As a result of detection, when the output Vo of the determination section 50 is L (Yes in S320), the CAL control part 63 determines whether or not the variable ncpath is equal to or larger than 2 (S320). When the variable ncpath is equal to or larger than 2 (Yes in S325), the CAL control part 63 initializes the variables Cnum and ncpath (S335).
As a result of detection, when the output Vo of the determination section 50 is not L (No in S320), the CAL control part 63 subtracts 2 from the variable x (S360), adds 1 to the variable Cnum (S365), and initializes the variable ncpath (S370).
When the variable ncpath is smaller than 2 (No in S325) and when the variables Cnum and ncpath are initialized (S335 and S370), the CAL control part 63 turns on the switch section 30 (S330). Accordingly, the rectifier 20 and the amplifier 40 are connected, and the control device 1 becomes a receiving state. In the first sequence, the output Vo is L and the variable ncpath is zero, so that the switch section 30 is turned on without any change being made.
When the switch section 30 is turned on, the CAL control part 63 determines whether or not the variable Cnum is larger than a maximum value CMAX (S340). When the variable Cnum is not larger than the maximum value CMAX (Yes in S340), the amplifier control part 64 reads the connection numbers m and n (values corresponding to the variable x) making the state of high sensitivity from the memory 65, controls the corresponding switches SWb1 to SWb2 and SWc1 to SWc2 of the amplifier 40, and maintains the state for a predetermined period of time TH (S345).
Next, the amplifier control part 64 reads the connection numbers m and n (values corresponding to the variable x−N) making the state of low sensitivity from the memory 65, controls the corresponding switches SWb1 to SWb2 and SWc1 to SWc2 of the amplifier 40, and maintains the state for a predetermined period of time TL (S350).
After the predetermined period of time TL elapses, the amplifier control part 64 adds 1 to the variable x (S355), returns the processing to the CAL control part 63, and resumes the correction operation (S305).
Meanwhile, when the variable Cnum is larger than the maximum value CMAX (No in S340), the amplifier control part 64 reads the connection numbers m and n (values corresponding to the variable x) making the state of high sensitivity from the memory 65, controls the corresponding switches SWb1 to SWb2 and SWc1 to SWc2 of the amplifier 40, and maintains the state for a predetermined period of time TH (S375).
Next, the amplifier control part 64 reads the connection numbers m and n (values corresponding to the variable x−N) making the state of low sensitivity from the memory 65, controls the corresponding switches SWb1 to SWb2 and SWc1 to SWc2 of the amplifier 40, and maintains the state for a predetermined period of time TL (S380).
After the predetermined period of time TL elapses, the CAL control part 63 determines whether or not the variable Cnum is equal to or larger than the maximum value CMAX (S390). When the variable Cnum is smaller than the maximum value CMAX, the amplifier control part 64 reads the connection numbers m and n (values corresponding to the variable x) making the state of high sensitivity from the memory 65, and executes the operations in the high sensitivity state and the low sensitivity state and adding processing on Cnum (S375 to S385). When the variable CNnum is equal to larger than a maximum value CNMAX, the CAL control part 63 initializes the variables Cnum and CNnum (S395), and resumes the correction operation (S305). Here, CNnum represents the maximum number of times at which the mode in which the high sensitivity state and the low sensitivity state are set as one cycle is consecutively executed. This value is previously set.
In the control device according to this embodiment, the operation shown in
Here, a relation among the instruction signal to be transmitted by the remote-control device 2 and respective operations of the correction operation, the high sensitivity state and the low sensitivity state of the control device 1 will be described.
Also in this operation example, there exists two operating states of the high sensitivity state and the low sensitivity state, similar to the example of the remote-control device shown in
Meanwhile, when the distance between the remote-control device and the control device is short, if the instruction signal is transmitted for a period of time longer than the correction operation period of time TC, the control device can surely receive the instruction signal.
Next, a control device according to another embodiment will be described in detail with reference to
In the control device 1 shown in
The CTC has a function of transferring charges stored in a capacitor included therein, and performs equivalently the same operation as that of a resistance, so that it can be replaced with a resistor. As shown in
It should be noted that the present invention is not limited only to the aforementioned embodiments and their operation examples. For instance, the explanation of the above embodiments was made in which the connection numbers making the high sensitivity state and the low sensitivity state are stored in the memory in the operation example shown in
| Number | Date | Country | Kind |
|---|---|---|---|
| P2008-208841 | Aug 2008 | JP | national |
