Patent Application
20050046366
The present invention relates generally to circuits for providing power to multiple electrical devices. In particular, the present invention relates to circuits for providing direct current (DC) power to multiple electrical devices.
Presently, there are a number of devices that use DC power. Many of these devices require DC power that has a constant polarity. In these devices, if the polarity of the power is reversed, the device may be severely damaged or destroyed. However, other DC devices are configured so that the polarity of the power may be reversible (e.g., reversible motors, etc.). Typically, because some of the electrical devices require constant polarity power and some require reversible polarity power, power for the constant polarity devices was obtained at a point in a circuit where the polarity of the power was not reversible (e.g., a position in the circuit before a switch that reversed the polarity of the DC power). This required separate power wires to be run to each of these devices, even in situations where the devices were located in close proximity to one another, thus increasing the cost and complexity of these devices.
Accordingly, there is a need for a simple and effective system for providing power to reversible polarity DC devices and constant polarity DC devices. Other features and advantages will be made apparent from the present description. The teachings disclosed extend to those embodiments that fall within the scope of the appended claims, regardless of whether they accomplish one or more of the aforementioned needs.
According to an exemplary embodiment, a system comprises a first electrical device, a second electrical device, and a circuit configured to provide power to the first and second electrical devices. The circuit is configured to provide a first voltage across the first electrical device, a polarity of the first voltage being reversible. The circuit is also configured to use the first voltage to provide a second voltage across the second electrical device. A polarity of the second voltage across the second electrical device remains constant when a polarity of the first voltage across the first electrical device is reversed.
According to another exemplary embodiment, a system comprises a first electrical device, a second electrical device, and a circuit configured to provide power to the first and second electrical devices. The circuit is configured to use a reversible polarity voltage to power the first electrical device. The circuit is also configured to convert the reversible polarity voltage to a constant polarity voltage which is used to power the second electrical device.
According to another exemplary embodiment, a direct current motor package comprises a position sensor coupled to the motor, a first lead, and a second lead. The first and second leads are configured to be coupled to a power controller to provide reversible polarity power to the motor. The reversible polarity power provided to the motor is used to provide constant polarity power to the position sensor.
According to another exemplary embodiment, a direct current motor package comprises a position sensor coupled to the motor and a circuit configured to provide power to the motor and the position sensor. The circuit is configured to provide a first voltage across the motor, a polarity of the first voltage being reversible. The circuit is also configured to use the first voltage to provide a second voltage across the position sensor. A polarity of the second voltage across the position sensor remains constant when the polarity of the first voltage across the motor is reversed.
According to another exemplary embodiment, a vehicle system comprises a direct current motor, a sensor, and a circuit. The direct current motor is configured to adjust a position of at least a portion of the vehicle device. The sensor is configured to measure the position of a portion of the vehicle device. The circuit is configured to provide a first voltage across the motor and a second voltage across the sensor, a polarity of the first voltage being reversible, the second voltage being obtained from the first voltage. The circuit is also configured to provide a polarity of the second voltage across the sensor that remains constant when a polarity of the first voltage across the motor is reversed.
With reference to the accompanying Figs., the present disclosure relates to circuits for providing power to multiple direct current (DC) electrical devices (e.g., motors, sensors (e.g., encoders, hall effect sensors, potentiometers, optical sensors, etc. that measure speed, position, temperature, etc.), actuators, solenoids, latches, etc.) and systems which utilize such circuits. While the subject matter herein is presented in the context of the use of such circuit in conjunction with a motor and a sensor (e.g., position sensor, temperature sensor, etc.), such circuits may be utilized in alternative applications.
Referring to
Power controller 56 is configured to receive power from a power source and control the output of the power to first and second electrical devices 50 and 52. The power source is typically a DC power source such as a 12 volt battery (e.g., car battery), 24 volt battery, 6 volt battery, DC power supplies (e.g., power supply for a computer), etc. Power controller 56 is configured to control the polarity of the DC power provided to first electrical device 50 and rectifier 60. Accordingly, power controller 56 may comprise any of a number of suitable control devices (e.g., a three way rocker switch, an H-bridge, relays, transistors, etc.). In an exemplary embodiment, power controller comprises a microprocessor or other control circuit to control the polarity of the power provided to first electrical device 50. In another exemplary embodiment, power controller may be configured to change the polarity of the DC power provided to first electrical device 50 in response to user input. The user may provide input by pressing a button (e.g., a button to control a motorized automotive device, etc.), changing the position of a switch, etc. In an exemplary embodiment, the user input is received by a microprocessor that is configured to control the polarity of the DC power provided to motor 50.
In general, first electrical device 50 is configured to be any DC electrical device that is capable of receiving reversible polarity power. Examples of such devices include reversible DC motors, actuators, solenoids, etc. Although system 58 is shown with only first electrical device 50 receiving reversible polarity DC power, in other embodiments, multiple electrical devices may be configured to receive reversible polarity DC power (e.g., two reversible DC motors in parallel, etc.).
Second electrical device 52 may be any of a number of electrical devices configured to receive constant polarity DC power. Examples of such devices include sensors such as those mentioned above, buzzer, LED, etc. Also, system 58 may be configured to include multiple electrical devices configured to receive constant polarity DC power.
In an exemplary embodiment, the power used to power first and second electrical devices 50 and 52 is approximately equal voltage. In this embodiment, there is no need to alter the power provided to first electrical device 50 to provide power to second electrical device 52.
Rectifier 60 is generally configured to receive the reversible polarity DC power provided to first electrical device 50 and output constant polarity DC power to second electrical device 52. Thus the polarity of the power provided to second electrical device 52 is the same regardless of the polarity of the power provided to first electrical device 50. Accordingly, rectifier 60 may be any of a number of suitable circuit elements that function to convert reversible polarity DC power to constant polarity DC power (e.g., diodes, thyristors, SCRs, portions of a printed circuit board, etc.).
Referring to
As shown in
In an exemplary embodiment, motor 50 is a conventional DC motor that includes an armature, a stator, windings, etc. In another exemplary embodiment, motor 50 may be configured to be of the size and type that is used in conjunction with moving vehicle devices.
In an exemplary embodiment, sensor 52 is a position sensor. For example, sensor 52 may be a Hall Effect sensor, a potentiometer, etc. In other embodiments, sensor 52 may be any of a number of low current (e.g., position sensors, temperature, sensors, speed sensor, encoder, buzzer, LED, etc.) sensors.
As shown in
In an exemplary embodiment, as shown in
In an exemplary embodiment, shown in
In an exemplary embodiment, system 58 may be used to implement a variety of desirable features. For example, system 58 may be used in conjunction with a memory feature. The memory feature allows the user to manually move vehicle seat 10 to a desirable position and store that position in memory. If vehicle seat 10 is moved from that position it may be restored to the desired position by pressing a button. When the button is pressed power controller 56 controls the actuation of one or more of motors 50, which, in turn, move vehicle seat 10 to the desired position. As vehicle seat 10 moves, sensor 52 is configured to measure its position and output the position to a microprocessor in power controller 56. By inputting the measured position into a microprocessor controller or other control circuit, a feedback control loop can be used to move vehicle seat 10 back to the stored position. Of course, other configurations may also be used. For example, in another embodiment, vehicle seat 10 may be configured to include multiple systems 58 configured to control the position of multiple seat devices. In another embodiment, vehicle seat 10 may be configured to include a single system 58 that is configured to control the position of multiple components of vehicle seat 10.
The construction and arrangement of the elements of the system as shown in the embodiments is illustrative only. Although only a few embodiments of the present invention have been described in detail in this disclosure, those of ordinary skill who review this disclosure will readily appreciate that many modifications are possible without materially departing from the novel teachings and advantages of the subject matter recited in the claims. Accordingly, all such modifications are intended to be included within the scope of the present invention as defined in the appended claims. The order or sequence of any process or method steps may be varied or re-sequenced according to alternative embodiments. Other substitutions, modifications, changes and omissions may be made in the design, operating conditions and arrangement of the embodiments without departing from the scope of the present invention as expressed in the appended claims.
