Patent Application
20250168949
The present disclosure relates to a light-emitting diode lamp string, and especially relates to a light-emitting diode lamp string system.
Due to the high luminous efficiency, low power consumption, long life, fast response speed, and high reliability of the light-emitting diodes, the light-emitting diodes have been widely used in many light-emitting products, such as the light-emitting diode lamp which includes a plurality of the light-emitting diodes, and the light-emitting diode lamp string which includes a plurality of the light-emitting diode lamps.
Moreover, the lighting control of each light-emitting diode requires external control instructions to change the lighting mode based on the instruction content. However, in order to generate the control instructions, complicated electronic circuits are used in the lamp string controller, which further increase the production cost.
Moreover, the brightness of the light-emitting diode is determined by the current flowing through the light-emitting diode. If the current flowing through the light-emitting diode is greater, the light-emitting diode is brighter. If the current flowing through the light-emitting diode is smaller, the brightness of the light-emitting diode is dimmer. It may be known from Ohm's law that the magnitude of the current is determined by the operating voltage received by the light-emitting diode lamp string. If the operating voltage is higher, the current flowing through the light-emitting diode lamp string is greater. If the operating voltage is lower, the current flowing through the light-emitting diode lamp string is smaller.
However, the light-emitting diode lamp string includes a plurality of light-emitting diode lamps. Because the paths of the light-emitting diode lamp string transmitting the operating voltage to the light-emitting diode lamps have line losses, the operating voltage received by each light-emitting diode lamp may be different due to the line losses, resulting in uneven brightness of each light-emitting diode lamp.
In order to solve the above-mentioned problems, an object of the present disclosure is to provide a light-emitting diode lamp string system.
In order to achieve the object of the present disclosure mentioned above, the light-emitting diode lamp string system of the present disclosure includes a light-emitting diode lamp string and a control apparatus. The light-emitting diode lamp string includes a plurality of light-emitting diode lamps which are electrically connected to each other. Moreover, each of the light-emitting diode lamps includes a first controller and a plurality of light-emitting diodes which are electrically connected to the first controller respectively. The control apparatus is used to receive a direct-current power and includes a controller, a power circuit, a controlled switch, and an impedance component. The controlled switch is electrically connected to the controller and is arranged on the power circuit to form a first loop. The impedance component is connected across the controlled switch and is arranged on the power circuit to form a second loop. The control apparatus is electrically connected to the light-emitting diode lamp string through the power circuit. Moreover, when the controller performs a lighting mode, the controller switches the controlled switch to turn on or off the controlled switch, so that when the controlled switch is turned on, a first voltage is formed from the direct-current power through the first loop, and when the controlled switch is turned off, a second voltage is formed from the direct-current power through the second loop, wherein the first voltage and the second voltage have a voltage difference and form a lighting signal. The first controller of each of the light-emitting diode lamps identifies the lighting signal to drive each of the light-emitting diodes to operate based on the lighting signal. Moreover, each of the light-emitting diode lamps further includes an impedance-balancing unit which is electrically connected to the first controller and the light-emitting diode. Moreover, the impedance-balancing unit adjusts an impedance of the light-emitting diode lamp to a fixed impedance based on the direct-current power received by the light-emitting diode lamp, so that a voltage of each of the light-emitting diode lamps is similar (or identical).
Moreover, in an embodiment of the light-emitting diode lamp string system of the present disclosure mentioned above, the impedance component is a resistor, a variable resistor, or a Zener diode.
Moreover, in an embodiment of the light-emitting diode lamp string system of the present disclosure mentioned above, each of the light-emitting diode lamps further includes a plurality of first switches, a linear controller, a positive terminal, and a negative terminal. Each of the first switches is electrically connected to the first controller and the light-emitting diode respectively. The linear controller is electrically connected to the first controller and the light-emitting diode. The positive terminal is electrically connected to the first controller, the light-emitting diode, and the linear controller. The negative terminal is electrically connected to the first controller, the first switch, and the linear controller. Moreover, each of the light-emitting diodes includes an anode terminal and a cathode terminal. The anode terminal is electrically connected to the first controller and the linear controller. The cathode terminal is electrically connected to the first switch. Moreover, the linear controller linearly adjusts the direct-current power received from the positive terminal so that a current flowing through the light-emitting diode lamp is a fixed current, so that a brightness of the light-emitting diode corresponds to the fixed current and is a fixed brightness.
Moreover, in an embodiment of the light-emitting diode lamp string system of the present disclosure mentioned above, each of the light-emitting diode lamps further includes a plurality of the impedance-balancing units. Each of the impedance-balancing units is electrically connected to the light-emitting diode lamp and the first controller respectively. The first controller identifies the lighting signal to generate a first control signal based on the lighting signal and transmits the first control signal to each of the first switches to turn on or off each of the first switches to turn on or off each of the light-emitting diodes. The impedance-balancing unit is controlled by the first controller to have a first equivalent impedance. When the first controller turns on the first switch, the light-emitting diode and the first switch have a second equivalent impedance. When the first controller turns off the first switch, the impedance-balancing unit is synchronously controlled to provide the first equivalent impedance equivalent to the second equivalent impedance to perform an impedance compensation.
Moreover, in an embodiment of the light-emitting diode lamp string system of the present disclosure mentioned above, each of the impedance-balancing units includes an inverting circuit and a bypass switch. The inverting circuit is electrically connected to the first controller. The bypass switch is electrically connected to the inverting circuit, the first controller, and the light-emitting diode. Moreover, the first controller turns on or off the bypass switch oppositely to the first switch through the inverting circuit, so that when the first controller turns off the first switch, the impedance-balancing unit provides the first equivalent impedance equivalent to the second equivalent impedance to perform the impedance compensation.
Moreover, in an embodiment of the light-emitting diode lamp string system of the present disclosure mentioned above, based on driving each of the light-emitting diodes to operate, the first controller of each of the light-emitting diode lamps synchronously controls each of the impedance-balancing units to perform the impedance compensation, to fix the first voltage which is supplied from the direct-current power to the light-emitting diode lamp through the first loop. When the first controller turns on the first switch, a first current from the anode terminal of the light-emitting diode to the cathode terminal of the light-emitting diode is generated. The linear controller controls a cross voltage between the positive terminal and the negative terminal to be a fixed voltage, to control the first current to be fixed, so that the brightness of the light-emitting diode corresponds to the fixed current and is the fixed brightness.
Moreover, in an embodiment of the light-emitting diode lamp string system of the present disclosure mentioned above, the linear controller includes a voltage-dividing circuit, a transistor, and an amplifier. The voltage-dividing circuit is electrically connected to the first controller, the light-emitting diode, the first switch, the bypass switch, the positive terminal, and the negative terminal, and generates a divided voltage based on the lighting signal. The transistor is coupled between the voltage-dividing circuit and a ground terminal. The amplifier is electrically connected to the voltage-dividing circuit and the transistor. Moreover, the amplifier includes a first input terminal, a second input terminal, and an output terminal. The first input terminal is electrically connected to the voltage-dividing circuit to receive the divided voltage. The second input terminal receives a reference voltage. The output terminal is electrically connected to the transistor. Moreover, the amplifier provides a second control signal to the transistor based on the divided voltage and the reference voltage to fix a size of a channel of the transistor. The amplifier adjusts a potential of the negative terminal based on a second current flowing through the transistor, to maintain the cross voltage at the fixed voltage by adjusting the potential of the negative terminal.
Moreover, in an embodiment of the light-emitting diode lamp string system of the present disclosure mentioned above, the linear controller further includes a constant voltage source and a voltage follower. The constant voltage source generates a constant voltage. The voltage follower is electrically connected to the constant voltage source and the second input terminal of the amplifier. Moreover, the voltage follower electrically isolates and amplifies the constant voltage to generate the reference voltage corresponding to the constant voltage. The voltage follower transmits the reference voltage to the amplifier through the second input terminal of the amplifier.
Moreover, in an embodiment of the light-emitting diode lamp string system of the present disclosure mentioned above, the voltage-dividing circuit includes a first voltage-dividing resistor and a second voltage-dividing resistor. The first voltage-dividing resistor is electrically connected to the first controller, the light-emitting diode, the bypass switch, the positive terminal, and the first input terminal of the amplifier. The second voltage-dividing resistor is electrically connected to the first voltage-dividing resistor, the first input terminal of the amplifier, the transistor, the first controller, the first switch, the bypass switch, and the negative terminal.
Moreover, in an embodiment of the light-emitting diode lamp string system of the present disclosure mentioned above, each of the impedance-balancing units further includes an equivalent diode impedance component electrically connected to the first controller, the light-emitting diode, and the bypass switch.
The advantage of the present disclosure is to improve the problem that the controller in the light-emitting diode lamp string includes complicated circuits for generating the lighting signal, and to improve the problem that the brightness of each of the light-emitting diode lamps is uneven.
Please refer to the detailed descriptions and figures of the present disclosure mentioned below for further understanding technologies, methods, and effects and achieving the predetermined purposes of the present disclosure. Further, the purposes, characteristics, and features of the present disclosure may be more deeply and specifically understood. However, the drawings are provided only for references and descriptions and not intended to limit the scope of the present disclosure.
In the present disclosure, numerous specific details are provided, to provide a comprehensive understanding of embodiments of the present disclosure. However, those skilled in the art may understand that the present disclosure may be practiced without one or more of these specific details. In other instances, well-known details are not shown or described to avoid obscuring features of the present disclosure. The technical content and the detailed description of the present disclosure are as follows with reference to the figures.
The control apparatus 30 is used to receive a direct-current power 302. The controlled switch 306 is arranged on the power circuit 310 to form a first loop L1. The impedance component 308 is connected across the controlled switch 306 and is arranged on the power circuit 310 to form a second loop L2. The impedance component 308 is a resistor, a variable resistor, or a Zener diode. In
The first controller 1 of each of the light-emitting diode lamps 200 identifies the lighting signal Vdc to generate a first control signal Sc1 based on the lighting signal Vdc and transmits the first control signal Sc1 to each of the first switches 3 to turn on or off each of the first switches 3 to turn on or off each of the light-emitting diodes 2. The impedance-balancing unit 56 is controlled by the first controller 1 to have a first equivalent impedance Re1. When the first controller 1 turns on the first switch 3, the light-emitting diode 2 and the first switch 3 have a second equivalent impedance Re2. When the first controller 1 turns off the first switch 3, the impedance-balancing unit 56 is synchronously controlled by the first controller 1 to provide the first equivalent impedance Re1 equivalent to the second equivalent impedance Re2 to perform the impedance compensation. The equivalent diode impedance component 566 (for example, a diode) may make the first equivalent impedance Re1 more accurately equivalent to the second equivalent impedance Re2.
The first controller 1 turns on or off the bypass switch 564 oppositely to the first switch 3 through the inverting circuit 562, so that when the first controller 1 turns off the first switch 3, the impedance-balancing unit 56 provides the first equivalent impedance Re1 equivalent to the second equivalent impedance Re2 to perform the impedance compensation.
Moreover, because the linear controller 4 has the function of linearly adjusting and controlling the input power when the input power changes and maintaining the power passing through the light-emitting diode lamp 200 as a constant power (such as a constant voltage or a constant current), when the direct-current power 302 received from the positive terminal Vdd changes, the linear controller 4 linearly adjusts the direct-current power 302 so that the current passing through the light-emitting diode lamp 200 is a fixed current, so that a brightness of the light-emitting diode 2 corresponds to the fixed current and is a fixed brightness. The specific content is described in detail below.
When the first controller 1 turns on the first switch 3, a first current I1 from the anode terminal LED+ of the light-emitting diode 2 to the cathode terminal LED− of the light-emitting diode 2 is generated. The linear controller 4 controls a cross voltage Vc between the positive terminal VDD and the negative terminal VSS to be a fixed voltage, to control the first current I1 to be fixed, so that the brightness of the light-emitting diode 2 corresponds to the fixed current and is the fixed brightness.
The voltage-dividing circuit 42 generates a divided voltage Vp based on the lighting signal Vdc. The constant voltage source 50 generates a constant voltage V. The voltage follower 52 electrically isolates and amplifies the constant voltage V to generate a reference voltage Vref corresponding to the constant voltage V. The voltage follower 52 transmits the reference voltage Vref to the amplifier 46 through the second input terminal In2 of the amplifier 46. The second input terminal In2 receives the reference voltage Vref. The amplifier 46 provides a second control signal Sc2 with linear variation characteristics to the transistor 44 based on the divided voltage Vp and the reference voltage Vref to fix a size of a channel of the transistor 44. In other words, the channel of the transistor 44 is controlled in the linear region based on the linear variation characteristics of the second control signal Sc2. A potential of the negative terminal VSS is adjusted through the size of the channel of the transistor 44, so that the cross voltage Vc is maintained at the fixed voltage by adjusting the potential of the negative terminal VSS. Specifically, since the second control signal Sc2 controls the gate-source voltage (commonly referred to as Vgs) of the transistor 44 to be fixed, the drain-source voltage (commonly referred to as Vds) of the transistor 44 is affected by a second current 12 (namely, the drain current, commonly referred to as Id) flowing through the transistor 44, so that the potential of the negative terminal VSS is adjusted. Therefore, by adjusting the potential of the negative terminal VSS, the cross voltage Vc between the positive terminal VDD and the negative terminal VSS may be maintained at the fixed voltage (for example but not limited to 3 volts), and further the first current I1 is controlled to be fixed.
The present disclosure has at least the following two advantages:
Although the present disclosure has been described with reference to the embodiment thereof, it will be understood that the present disclosure is not limited to the details thereof. Various substitutions and modifications have been suggested in the foregoing description, and others will occur to those of ordinary skill in the art. Therefore, all such substitutions and modifications are intended to be embraced within the scope of the present disclosure.
