LED control circuit and control method

Abstract

The present disclosure relates to an LED control circuit and a control method, belonging to the technical field of LED control, the LED control circuit comprising a transformer, a first end of the transformer being connected with an AC input source of the LED control circuit; a first conversion circuit, a first end of the first conversion circuit being connected with a second end of the transformer, a second end of the first conversion circuit being connected with an LED lamp; a second conversion circuit, a first end of the second conversion circuit being connected with a third end of the transformer; a feedback circuit, a first end of the feedback circuit being connected with the second end of the first conversion circuit, a second end of the feedback circuit being connected with a second end of the second conversion circuit; a control circuit, the control circuit being connected with the AC input source, the second conversion circuit and the feedback circuit respectively.

Description

Technical Field

[0001] This disclosure relates to the technical field of LED control, and more specifically, to an LED control circuit and control method. Background Technology

[0002] With the rapid development of LED lights, they have been widely used in various industries. Furthermore, LED lights can be categorized into constant voltage LED lights or constant current LED lights based on their power supply characteristics to suit different application scenarios. Currently, existing LED light constant current control generally uses switching power supply topologies (Buck, Boost, Buck-Boost) and adjusts the current through high-frequency switching. However, this method is difficult to use simultaneously to power multiple LED lights that require different voltages, resulting in unstable power supply for multiple LED lights. Summary of the Invention

[0003] One object of the present disclosure is to provide an LED control circuit and control method.

[0004] According to a first aspect of this disclosure, an LED control circuit is provided, the LED control circuit comprising:

[0005] A transformer, the first end of which is connected to the AC input source of the LED control circuit;

[0006] A first conversion circuit, wherein a first terminal of the first conversion circuit is connected to a second terminal of the transformer, and a second terminal of the first conversion circuit is connected to an LED light;

[0007] A second conversion circuit, wherein the first terminal of the second conversion circuit is connected to the third terminal of the transformer;

[0008] A feedback circuit, wherein a first terminal of the feedback circuit is connected to a second terminal of the first conversion circuit, and a second terminal of the feedback circuit is connected to a second terminal of the second conversion circuit;

[0009] A control circuit is connected to the AC input source, the second conversion circuit, and the feedback circuit, respectively.

[0010] In response to a power supply request for the LED, the control circuit first controls the AC input source to output a first AC power and controls the second conversion circuit to operate at a set first conversion efficiency; the control circuit adjusts the first AC power output by the AC input source in response to a feedback signal output by the feedback circuit.

[0011] Optionally, the first conversion circuit includes a first diode, a first capacitor, and a first resistor;

[0012] In this configuration, the anode of the first diode is connected to the first end of the first secondary winding of the transformer, the connection point between the cathode of the first diode and the first end of the first capacitor is connected to the positive terminal of the LED, the connection point between the second end of the first capacitor and the second end of the first secondary winding of the transformer is connected to the ground terminal of the LED control circuit, and the first resistor is connected between the ground terminal of the LED control circuit and the negative terminal of the LED.

[0013] Optionally, the second switching circuit includes a second switch, a third switch, a fourth switch, and a fifth switch;

[0014] The connection point between the source of the second switching transistor and the drain of the third switching transistor is connected to the first end of the second secondary winding of the transformer; the connection point between the drain of the second switching transistor and the drain of the fourth switching transistor is connected to the second end of the feedback circuit; the connection point between the source of the fourth switching transistor and the drain of the fifth switching transistor is connected to the second end of the second secondary winding of the transformer; and the connection point between the source of the third switching transistor and the source of the fifth switching transistor is connected to the ground terminal of the LED control circuit.

[0015] Optionally, the feedback circuit includes a comparator circuit, a reference circuit, and a signal output circuit. The first terminal of the comparator circuit is connected to the LED, the second terminal of the comparator circuit is connected to the first terminal of the reference circuit, the second terminal of the reference circuit is connected to the first terminal of the signal output circuit, and the second terminal of the signal output circuit is connected to the second terminal of the second conversion circuit.

[0016] Optionally, the comparator circuit includes a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a fourth capacitor, a fifth capacitor, a sixth capacitor, and an operational amplifier;

[0017] Wherein, the first end of the seventh resistor is connected to the ground terminal of the LED control circuit; the connection point between the second end of the seventh resistor and the first end of the sixth resistor is connected to the inverting input terminal of the operational amplifier; the connection point between the second end of the sixth resistor and the first end of the fifth resistor is connected to the output terminal of the operational amplifier; the second end of the fifth resistor is connected to the first terminal of the reference circuit; the first end of the eighth resistor is connected to the second terminal of the first conversion circuit; the connection point between the second end of the eighth resistor and the first end of the ninth resistor is connected to the non-inverting input terminal of the operational amplifier; the second end of the ninth resistor is connected to the ground terminal of the LED control circuit; the fourth capacitor is connected across the sixth resistor; the fifth capacitor is connected across the inverting and non-inverting input terminals of the operational amplifier; and the sixth capacitor is connected across the ninth capacitor.

[0018] Optionally, the reference circuit includes a fourth resistor, a voltage regulator, a second capacitor, and a third capacitor;

[0019] Wherein, the connection point of the first terminal of the voltage regulator and the first terminal of the third capacitor is connected to the first terminal of the signal output circuit, the second terminal of the third capacitor is connected to the first terminal of the fourth resistor, the connection point of the second terminal of the voltage regulator and the second terminal of the fourth resistor is connected to the second terminal of the comparator circuit, the third terminal of the voltage regulator is connected to the ground terminal of the LED control circuit, the first terminal of the second capacitor is connected to the first terminal of the third capacitor, and the second terminal of the second capacitor is connected to the second terminal of the fourth resistor.

[0020] Optionally, the signal output circuit includes a second resistor, a third resistor, and a first optocoupler;

[0021] Wherein, the first end of the second resistor is connected to the second end of the second conversion circuit, the connection point between the second end of the second resistor and the first end of the third resistor is connected to the anode of the light-emitting diode of the first optocoupler, the connection point between the second end of the third resistor and the cathode of the light-emitting diode of the first optocoupler is connected to the second end of the reference circuit, the collector of the phototransistor of the first optocoupler is connected to the first signal feedback terminal of the control circuit, and the emitter of the phototransistor of the first optocoupler is connected to the ground terminal of the LED control circuit.

[0022] Optionally, the feedback circuit further includes a first switching transistor;

[0023] The drain of the first switching transistor is connected to the second terminal of the reference circuit, the source of the first switching transistor is connected to the ground terminal of the LED control circuit, and the gate of the first switching transistor is connected to the control circuit.

[0024] Optionally, it also includes an energy storage circuit, which includes an energy storage battery and a first switch;

[0025] The first switch is located between the first end of the energy storage battery and the second end of the second conversion circuit, and the second end of the energy storage battery is used to connect to the output end of the power generation equipment.

[0026] According to a second aspect of this disclosure, a control method is also provided, wherein the control method is applied to an LED control circuit as described in the first aspect, the control method is executed by the control circuit, and the control method includes:

[0027] In response to the power supply request of the LED lamp in the LED control circuit, the remaining power of the energy storage battery in the LED control circuit is determined;

[0028] When the remaining power is less than or equal to a set threshold, the AC input source in the LED control circuit is controlled to output a first AC power, causing the transformer in the LED control circuit to output a second AC power. The first conversion circuit in the LED control circuit converts the second AC power and outputs it to the LED lamp. The second conversion circuit in the LED control circuit is controlled to operate at a set first conversion efficiency, causing the second conversion circuit to convert the second AC power into a first DC power. In response to the feedback signal output by the feedback circuit in the LED control circuit, the first AC power output by the AC input source is adjusted.

[0029] When the remaining power is greater than a set threshold, the energy storage battery in the LED control circuit is controlled to output a second DC power to the second conversion circuit, and the second conversion circuit is controlled to operate at a set second conversion efficiency, so that the second conversion circuit converts the second DC power into a third AC power. The transformer responds to the third AC power and outputs a fourth AC power to the first conversion circuit. The first conversion circuit converts the fourth AC power and outputs it to the LED lamp.

[0030] According to a third aspect of this disclosure, a control device is also provided, the control device comprising:

[0031] A response module is used to respond to a power supply request from an LED in the LED control circuit and determine the remaining power of the energy storage battery in the LED control circuit.

[0032] A first control module is configured to, when the remaining power is less than or equal to a set threshold, control the AC input source in the LED control circuit to output a first AC current, causing the transformer in the LED control circuit to output a second AC current, and the first conversion circuit in the LED control circuit to convert the second AC current and output it to the LED lamp; control the second conversion circuit in the LED control circuit to operate at a set first conversion efficiency, causing the second conversion circuit to convert the second AC current into a first DC current; and adjust the first AC current output by the AC input source in response to a feedback signal output by the feedback circuit in the LED control circuit.

[0033] The second control module is used to control the energy storage battery in the LED control circuit to output a second DC power to the second conversion circuit when the remaining power is greater than a set threshold, and to control the second conversion circuit to operate at a set second conversion efficiency, so that the second conversion circuit converts the second DC power into a third AC power, the transformer responds to the third AC power to output a fourth AC power to the first conversion circuit, and the first conversion circuit outputs the fourth AC power to the LED lamp after conversion.

[0034] According to a fourth aspect of this disclosure, a computer-readable storage medium is also provided, wherein a computer program is stored therein, wherein the computer program is configured to execute the above-described control method at runtime.

[0035] According to a fifth aspect of this disclosure, a computer program product is also provided, comprising a computer program that, when executed, causes a computer to perform the control method steps described above.

[0036] According to a sixth aspect of this disclosure, a control terminal is also provided, including a memory and a processor, wherein the memory stores a computer program and the processor is configured to execute the control method described above through the computer program.

[0037] One beneficial effect of this disclosure is that the LED control circuit provided in this disclosure converts the AC power output from the transformer into DC power that can be supplied to the LED lamp through a first conversion circuit, and converts the AC power output from the transformer into a reference voltage required by the feedback circuit through a second conversion circuit. The feedback circuit can feed back a signal to the control circuit, so that the control circuit can adjust the input of the AC input source according to the feedback signal. On the one hand, it realizes the simultaneous supply of power to multiple LED lamps that require different voltages, ensuring the power supply stability of multiple constant current LED lamps. On the other hand, it can control the LED lamps in an isolated manner, effectively improving the safety of the LED lamp control circuit.

[0038] The features and advantages of the embodiments of this specification will become clear from the following detailed description of exemplary embodiments with reference to the accompanying drawings. Attached Figure Description

[0039] The accompanying drawings, which are incorporated in and form a part of this specification, illustrate embodiments of this specification and, together with their description, serve to explain the principles of these embodiments.

[0040] Figure 1 A structural block diagram is shown that can be used to implement an LED control circuit according to embodiments of the present disclosure;

[0041] Figure 2 Circuit diagrams of a first conversion circuit and a second conversion circuit according to some embodiments are shown;

[0042] Figure 3 A circuit diagram of a feedback circuit according to some embodiments is shown;

[0043] Figure 4 A circuit diagram of a second conversion circuit according to some embodiments is shown;

[0044] Figure 5A flowchart illustrating a control method according to some embodiments is shown;

[0045] Figure 6 A schematic diagram of the structure of a control device according to some embodiments is shown;

[0046] Figure 7 A schematic diagram of the hardware structure of a control device according to some embodiments is shown. Detailed Implementation

[0047] Various exemplary embodiments of this specification will now be described in detail with reference to the accompanying drawings.

[0048] The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the embodiments of this specification or their application or use.

[0049] It should be noted that similar labels and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be discussed further in subsequent figures.

[0050] It should be noted that all actions involving the acquisition of signals, information, or data in this embodiment are carried out in compliance with the relevant data protection laws and regulations of the country where the location is situated, and with authorization from the owner of the relevant equipment.

[0051] <System Implementation>

[0052] This disclosure provides a novel LED control circuit, such as... Figure 1 As shown, the LED control circuit includes:

[0053] Transformer T12, the first terminal of transformer T12 is connected to AC input source 1 of LED control circuit;

[0054] First conversion circuit 3, the first end of the first conversion circuit 3 is connected to the second end of transformer T12, and the second end of the first conversion circuit 3 is connected to LED lamp 4;

[0055] The second conversion circuit 5, the first terminal of the second conversion circuit 5 is connected to the third terminal of the transformer T12;

[0056] Feedback circuit 7, the first end of feedback circuit 7 is connected to the second end of first conversion circuit 3, and the second end of feedback circuit 7 is connected to the second end of second conversion circuit 5;

[0057] Control circuit 6 is connected to AC input source 1, second conversion circuit 5 and feedback circuit 7 respectively;

[0058] In response to the power supply request for the LED lamp 4, the control circuit 6 first controls the AC input source 1 to output a first AC power, and controls the second conversion circuit 5 to operate at a set first conversion efficiency; in response to the feedback signal output by the feedback circuit 7, the control circuit 6 adjusts the first AC power output by the AC input source 1.

[0059] In this embodiment, the second AC power output from transformer T12 is converted into DC power to supply the LED lamp 4 by the first conversion circuit 3, and the second AC power output from transformer T12 is converted into the reference voltage VCC required by the feedback circuit 7 by the second conversion circuit 5. The feedback circuit 7 can output the generated feedback signal to the control circuit 6, so that the control circuit 6 adjusts the input of AC input source 1 according to the feedback signal. On the one hand, it realizes the simultaneous supply of power to multiple LED lamps 4 that require different voltages, ensuring the power supply stability of multiple constant current LED lamps 4. On the other hand, it can control the LED lamps 4 in an isolated manner, effectively improving the safety of the LED lamp control circuit 6.

[0060] In some embodiments, such as Figure 2 As shown, in order to improve the stability of the power supply to the LED lamp 4, the first conversion circuit 3 includes a first diode D1, a first capacitor C1C1, and a first resistor R1;

[0061] In this circuit, the anode of the first diode D1 is connected to the first end of the first secondary winding of the transformer T12, the connection point between the cathode of the first diode D1 and the first end of the first capacitor C1C1 is connected to the positive terminal of the LED lamp 4, the connection point between the second end of the first capacitor C1C1 and the second end of the first secondary winding of the transformer T12 is connected to the ground terminal of the LED control circuit, and the first resistor R1 is connected between the ground terminal of the LED control circuit and the negative terminal of the LED lamp 4.

[0062] In this embodiment, the first diode D1 serves to prevent reverse polarity, thereby improving the stability of the power supply to the LED 4.

[0063] In some embodiments, such as Figure 4 As shown, in order to improve the accuracy of the second conversion circuit 5 in providing the required reference voltage VCC to the feedback circuit 7, the second conversion circuit 5 includes a second switch Q2, a third switch Q3, a fourth switch Q4 and a fifth switch Q5;

[0064] Specifically, the connection point between the source of the second switch Q2 and the drain of the third switch Q3 is connected to the first end of the second secondary winding of the transformer T12; the connection point between the drain of the second switch Q2 and the drain of the fourth switch Q4 is connected to the second end of the feedback circuit 7; the connection point between the source of the fourth switch Q4 and the drain of the fifth switch Q5 is connected to the second end of the second secondary winding of the transformer T12; and the connection point between the source of the third switch Q3 and the source of the fifth switch Q5 is connected to the ground terminal of the LED control circuit.

[0065] In this embodiment, the second switch Q2, the third switch Q3, the fourth switch Q4, and the fifth switch Q5 are all MOSFETs. The second switch Q2, the third switch Q3, the fourth switch Q4, and the fifth switch Q5 are all controlled by the control circuit 6, so that the second switch Q2 and the fifth switch Q5 are in one group, and the third switch Q3 and the fourth switch Q4 are in another group. The control circuit 6 controls these two groups to conduct alternately, so that the second conversion circuit 5 can convert the second AC power output from the transformer T12 into the required reference voltage VCC.

[0066] In some embodiments, in order to enable the feedback circuit 7 to output a feedback signal to the control circuit 6, the feedback circuit 7 includes a comparison circuit, a reference circuit, and a signal output circuit. The first terminal of the comparison circuit is connected to the LED 4, the second terminal of the comparison circuit is connected to the first terminal of the reference circuit, the second terminal of the reference circuit is connected to the first terminal of the signal output circuit, and the second terminal of the signal output circuit is connected to the second terminal of the second conversion circuit 5.

[0067] In this embodiment, by setting up a comparison circuit, a reference circuit, and a signal output circuit, and by using the first resistor R1 for secondary-side current sampling and an optocoupler, the duty cycle of the AC input source 1 is dynamically adjusted to achieve precise constant current output (accuracy up to ±3%), thereby meeting the stringent requirements of the LED lamp 4 for current stability.

[0068] In some embodiments, to ensure the accuracy of the feedback signal of the feedback circuit 7, such as... Figure 3 As shown, the comparator circuit includes a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a fourth capacitor C4, a fifth capacitor C5, a sixth capacitor C6, and an operational amplifier U2.

[0069] In this circuit, the first end of the seventh resistor R7 is connected to the ground terminal of the LED control circuit; the connection point between the second end of the seventh resistor R7 and the first end of the sixth resistor R6 is connected to the inverting input terminal of the operational amplifier U2; the connection point between the second end of the sixth resistor R6 and the first end of the fifth resistor R5 is connected to the output terminal of the operational amplifier U2; the second end of the fifth resistor R5 is connected to the first terminal of the reference circuit; the first end of the eighth resistor R8 is connected to the second terminal of the first conversion circuit 3; the connection point between the second end of the eighth resistor R8 and the first end of the ninth resistor R9 is connected to the non-inverting input terminal of the operational amplifier U2; the second end of the ninth resistor R9 is connected to the ground terminal of the LED control circuit; the fourth capacitor C4 is connected across the sixth resistor R6; the fifth capacitor C5 is connected across the inverting and non-inverting input terminals of the operational amplifier U2; and the sixth capacitor C6 is connected across the ninth capacitor.

[0070] In this embodiment, the seventh resistor R7 and the eighth resistor R8 are used as proportional resistors. The seventh resistor R7 and the eighth resistor R8 collect the voltage difference across the first resistor R1 as the input signal of the operational amplifier U2. The resistance values ​​of the seventh resistor R7 and the eighth resistor R8 are equal. The sixth resistor R6 is used as a feedback resistor and has the same resistance value as the ninth resistor R9 matched to ground. It can be seen that the amplification factor of the operational amplifier U2 is the output voltage of the operational amplifier U2 = voltage across the first resistor R1 × R6 / R7.

[0071] In some embodiments, in order to enable the control circuit 6 to control the AC input source 1 through the feedback signal output by the feedback circuit 7, such as... Figure 3 As shown, the reference circuit includes a fourth resistor R4, a voltage regulator U1, a second capacitor C2, and a third capacitor C3.

[0072] Specifically, the connection point between the first terminal of voltage regulator U1 and the first terminal of third capacitor C3 is connected to the first terminal of signal output circuit; the second terminal of third capacitor C3 is connected to the first terminal of fourth resistor R4; the connection point between the second terminal of voltage regulator U1 and the second terminal of fourth resistor R4 is connected to the second terminal of comparator circuit; the third terminal of voltage regulator U1 is connected to the ground terminal of LED control circuit; the first terminal of second capacitor C2 is connected to the first terminal of third capacitor C3; and the second terminal of second capacitor C2 is connected to the second terminal of fourth resistor R4.

[0073] In this embodiment, the voltage regulator U1 can be a chip with the model number LM431 or TL431.

[0074] In some embodiments, in order to enable the control circuit 6 to control the AC input source 1 through the feedback signal output by the feedback circuit 7, such as... Figure 3 As shown, the signal output circuit includes a second resistor R2, a third resistor R3, and a first optocoupler OC1;

[0075] In this circuit, the first end of the second resistor R2 is connected to the second end of the second conversion circuit 5; the connection point between the second end of the second resistor R2 and the first end of the third resistor R3 is connected to the anode of the light-emitting diode of the first optocoupler OC1; the connection point between the second end of the third resistor R3 and the cathode of the light-emitting diode of the first optocoupler OC1 is connected to the second end of the reference circuit; the collector of the phototransistor of the first optocoupler OC1 is connected to the first signal feedback terminal of the control circuit 6; and the emitter of the phototransistor of the first optocoupler OC1 is connected to the ground terminal of the LED control circuit.

[0076] In this embodiment, the reference voltage of the voltage regulator U1 is 3V. When the output voltage of the operational amplifier U2 is 3V, the feedback circuit 7 maintains balance.

[0077] In this embodiment, when the output voltage of the operational amplifier U2 is higher than 3V, the voltage at the second terminal of the voltage regulator U1 increases. Since the voltage regulator U1 has negative feedback, the voltage at the first terminal of the voltage regulator U1 decreases. At this time, the voltage across the optocoupler OC1 increases, and the current of the feedback signal flowing from the anode of the light-emitting diode of the optocoupler to the cathode of the light-emitting diode increases accordingly. The pull-up current of the first feedback terminal COMP1 of the control chip also increases accordingly. When the pull-up current of the first feedback terminal COMP1 increases, the control circuit 6 controls the output of the AC input source 1 to decrease.

[0078] In this embodiment, when the output voltage of the operational amplifier U2 is lower than 3V, the voltage at the first terminal of the voltage regulator U1 increases, and the current of the feedback signal flowing from the anode of the light-emitting diode to the cathode of the light-emitting diode at both ends of the optocoupler OC1 decreases accordingly. The pull-up current at the first feedback terminal COMP1 of the control chip also decreases accordingly. When the pull-up current at the first feedback terminal COMP1 decreases, the control circuit 6 controls the output of the AC input source 1 to increase.

[0079] In some embodiments, in order to achieve overvoltage protection of the LED control circuit, the feedback circuit 7 further includes a first switching transistor Q1;

[0080] In this circuit, the drain of the first switching transistor Q1 is connected to the second terminal of the reference circuit, the source of the first switching transistor Q1 is connected to the ground terminal of the LED control circuit, and the gate of the first switching transistor Q1 is connected to the control circuit 6.

[0081] In this embodiment, the LED lamp 4 can feed back the input voltage value to the control circuit 6 through its built-in chip. When the input voltage value of the LED lamp 4 exceeds the voltage threshold, the control circuit 6 can control the first switch Q1 to turn on, so as to achieve the purpose of overvoltage protection of the LED control circuit.

[0082] In some embodiments, the energy storage circuit 8 includes an energy storage battery 9 and a first switch K1;

[0083] The first switch K1 is located between the first end of the energy storage battery 9 and the second end of the second conversion circuit 5. The second end of the energy storage battery 9 is used to connect to the output end of the power generation device 10.

[0084] In this embodiment, the power generation equipment 10 is, for example, a photovoltaic panel or a wind turbine.

[0085] In this embodiment, the first switch K1 is communicatively connected to the control circuit 6. The first switch K1 is controlled by the control circuit 6, so that when the energy storage battery 9 has sufficient remaining power, the control circuit 6 controls the first switch K1 to close, allowing the energy storage battery 9 to supply power to the LED lamp 4 through the second conversion circuit 5, the transformer T12, and the first conversion circuit 3. By reusing the second conversion circuit 5, the transformer T12, and the first conversion circuit 3 to supply power to the LED lamp 4, the manufacturing cost of the LED lamp control circuit 6 is effectively reduced.

[0086] <Method Implementation>

[0087] Figure 5 This is a flowchart illustrating a control method according to one embodiment. The implementing entity is, for example, a... Figure 1 Control circuit 6.

[0088] like Figure 5 As shown, the control method of this embodiment may include the following steps S510 to S530:

[0089] Step S510: In response to the power supply request of the LED lamp in the LED control circuit, determine the remaining power of the energy storage battery in the LED control circuit.

[0090] Step S520: When the remaining power is less than or equal to a set threshold, control the AC input source in the LED control circuit to output a first AC power, so that the transformer in the LED control circuit outputs a second AC power. The first conversion circuit in the LED control circuit converts the second AC power and outputs it to the LED lamp. Control the second conversion circuit in the LED control circuit to operate at a set first conversion efficiency, so that the second conversion circuit converts the second AC power into a first DC power. In response to the feedback signal output by the feedback circuit in the LED control circuit, adjust the first AC power output by the AC input source.

[0091] In this embodiment, the threshold can be set to 70%, 80%, or 90%, etc., and is not limited here.

[0092] In step S530, when the remaining power is greater than a set threshold, the energy storage battery in the LED control circuit is controlled to output a second DC power to the second conversion circuit, and the second conversion circuit is controlled to operate at a set second conversion efficiency, so that the second conversion circuit converts the second DC power into a third AC power, the transformer responds to the third AC power and outputs a fourth AC power to the first conversion circuit, and the first conversion circuit converts the fourth AC power and outputs it to the LED light.

[0093] In this embodiment, the first conversion efficiency and the second conversion efficiency can be preset and are not limited here.

[0094] <Device Embodiment>

[0095] Figure 6 A schematic diagram of the composition of a control device according to an embodiment of the present disclosure is shown. Figure 6 As shown, the control device 600 includes:

[0096] The response module 610 is used to respond to the power supply request of the LED lamp in the LED control circuit and determine the remaining power of the energy storage battery in the LED control circuit.

[0097] The first control module 620 is used to control the AC input source in the LED control circuit to output a first AC power when the remaining power is less than or equal to a set threshold, so that the transformer in the LED control circuit outputs a second AC power, and the first conversion circuit in the LED control circuit converts the second AC power and outputs it to the LED lamp; control the second conversion circuit in the LED control circuit to operate at a set first conversion efficiency, so that the second conversion circuit converts the second AC power into a first DC power; and adjust the first AC power output by the AC input source in response to the feedback signal output by the feedback circuit in the LED control circuit.

[0098] The second control module 630 is used to control the energy storage battery in the LED control circuit to output a second DC power to the second conversion circuit when the remaining power is greater than a set threshold, and to control the second conversion circuit to operate at a set second conversion efficiency, so that the second conversion circuit converts the second DC power into a third AC power, the transformer responds to the third AC power to output a fourth AC power to the first conversion circuit, and the first conversion circuit converts the fourth AC power and outputs it to the LED light.

[0099] <Equipment Example>

[0100] Figure 7 A schematic diagram of the hardware structure of a control device according to some other embodiments is shown. For example... Figure 7As shown, the control device 700 includes a processor 710 and a memory 720. The memory 720 stores a computer program that controls the processor 710 to operate in order to control the control device 700 to execute a control method according to any embodiment of the present disclosure.

[0101] This disclosure also provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements a control method according to any embodiment of this disclosure.

[0102] The various embodiments in this specification are described in a progressive manner. Similar or identical parts between embodiments can be referred to mutually. Each embodiment focuses on describing the differences from other embodiments. In particular, the device and apparatus embodiments are basically similar to the method embodiments, so the descriptions are relatively simple; relevant parts can be referred to the descriptions of the method embodiments.

[0103] The foregoing has described specific embodiments of this specification. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps recited in the claims may be performed in a different order than that shown in the embodiments and may still achieve the desired result. Furthermore, the processes depicted in the drawings do not necessarily require the specific or sequential order shown to achieve the desired result. In some embodiments, multitasking and parallel processing are possible or may be advantageous.

[0104] Embodiments of this specification may be devices, methods, and / or computer program products. A computer program product may include a computer-readable storage medium having computer-readable program instructions loaded thereon for causing a processor to implement various aspects of the embodiments of this specification.

[0105] Computer-readable storage media can be tangible devices capable of holding and storing instructions for use by an instruction execution device. Computer-readable storage media can be, for example—but not limited to—electrical storage devices, magnetic storage devices, optical storage devices, electromagnetic storage devices, semiconductor storage devices, or any suitable combination thereof. More specific examples (a non-exhaustive list) of computer-readable storage media include: portable computer disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), static random access memory (SRAM), portable compact disc read-only memory (CD-ROM), digital multifunction disc (DVD), memory sticks, floppy disks, mechanical encoding devices, such as punch cards or recessed protrusions storing instructions thereon, and any suitable combination thereof. The computer-readable storage media used herein are not to be construed as transient signals themselves, such as radio waves or other freely propagating electromagnetic waves, electromagnetic waves propagating through waveguides or other transmission media (e.g., light pulses through fiber optic cables), or electrical signals transmitted through wires.

[0106] The computer-readable program instructions described herein can be downloaded from computer-readable storage media to various computing / processing devices, or downloaded via a network, such as the Internet, local area network, wide area network, and / or wireless network, to an external computer or external storage device. The network may include copper transmission cables, fiber optic transmission, wireless transmission, routers, firewalls, switches, gateway computers, and / or edge servers. A network adapter card or network interface in each computing / processing device receives the computer-readable program instructions from the network and forwards them to the computer-readable storage media in the respective computing / processing device.

[0107] Computer program instructions used to perform the operations of the embodiments described herein may be assembly instructions, instruction set architecture (ISA) instructions, machine instructions, machine-dependent instructions, microcode, firmware instructions, state setting data, or source code or object code written in any combination of one or more programming languages, including object-oriented programming languages ​​such as Smalltalk, C++, etc., and conventional procedural programming languages ​​such as the "C" language or similar programming languages. The computer-readable program instructions may execute entirely on the user's computer, partially on the user's computer, as a standalone software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In cases involving a remote computer, the remote computer may be connected to the user's computer via any type of network—including a local area network (LAN) or a wide area network (WAN)—or may be connected to an external computer (e.g., via the Internet using an Internet service provider). In some embodiments, electronic circuitry, such as programmable logic circuitry, field-programmable gate arrays (FPGAs), or programmable logic arrays (PLAs), is personalized by utilizing state information from the computer-readable program instructions. This electronic circuitry can execute the computer-readable program instructions to implement various aspects of the embodiments described herein.

[0108] Various aspects of embodiments of this specification are described herein with reference to flowchart illustrations and / or block diagrams of methods, apparatus (devices), and computer program products according to embodiments of this specification. It should be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer-readable program instructions.

[0109] These computer-readable program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing apparatus to produce a machine such that, when executed by the processor of the computer or other programmable data processing apparatus, they create means for implementing the functions / actions specified in one or more blocks of the flowchart and / or block diagram. These computer-readable program instructions can also be stored in a computer-readable storage medium that causes a computer, programmable data processing apparatus, and / or other device to operate in a particular manner; thus, the computer-readable medium storing the instructions comprises an article of manufacture that includes instructions for implementing aspects of the functions / actions specified in one or more blocks of the flowchart and / or block diagram.

[0110] Computer-readable program instructions may also be loaded onto a computer, other programmable data processing apparatus, or other device to cause a series of operational steps to be performed on the computer, other programmable data processing apparatus, or other device to produce a computer-implemented process, thereby causing the instructions executed on the computer, other programmable data processing apparatus, or other device to perform the functions / actions specified in one or more boxes of a flowchart and / or block diagram.

[0111] The flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of systems, methods, and computer program products according to various embodiments of this specification. In this regard, each block in a flowchart or block diagram may represent a module, program segment, or part of an instruction, which contains one or more executable instructions for implementing the specified logical function. In some alternative implementations, the functions marked in the blocks may occur in a different order than those marked in the drawings. For example, two consecutive blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. It should also be noted that each block in the block diagrams and / or flowcharts, and combinations of blocks in the block diagrams and / or flowcharts, can be implemented using a dedicated hardware-based system that performs the specified function or action, or using a combination of dedicated hardware and computer instructions. It will be known to those skilled in the art that implementation in hardware, implementation in software, and implementation in a combination of software and hardware are equivalent.

[0112] Various embodiments of this specification have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope of the described embodiments. The terminology used herein is chosen to best explain the principles, practical application, or improvement of the technology in the market, or to enable others skilled in the art to understand the embodiments disclosed herein.

Claims

1. An LED control circuit, wherein, The LED control circuit includes: A transformer, the first end of which is connected to the AC input source of the LED control circuit; A first conversion circuit, wherein a first terminal of the first conversion circuit is connected to a second terminal of the transformer, and a second terminal of the first conversion circuit is connected to an LED light; A second conversion circuit, wherein the first terminal of the second conversion circuit is connected to the third terminal of the transformer; A feedback circuit, wherein a first terminal of the feedback circuit is connected to a second terminal of the first conversion circuit, and a second terminal of the feedback circuit is connected to a second terminal of the second conversion circuit; A control circuit is connected to the AC input source, the second conversion circuit, and the feedback circuit, respectively. In this circuit, in response to a power supply request for the LED, the control circuit first controls the AC input source to output a first AC power, and then controls the second conversion circuit to operate at a set first conversion efficiency; the control circuit adjusts the first AC power output by the AC input source in response to a feedback signal output by the feedback circuit. The first conversion circuit includes a first diode, a first capacitor, and a first resistor; Wherein, the anode of the first diode is connected to the first end of the first secondary winding of the transformer, the connection point of the cathode of the first diode and the first end of the first capacitor is connected to the positive terminal of the LED, the connection point of the second end of the first capacitor and the second end of the first secondary winding of the transformer is connected to the ground terminal of the LED control circuit, and the first resistor is connected between the ground terminal of the LED control circuit and the negative terminal of the LED. The feedback circuit includes a comparator circuit, a reference circuit, and a signal output circuit. The first terminal of the comparator circuit is connected to the LED, the second terminal of the comparator circuit is connected to the first terminal of the reference circuit, the second terminal of the reference circuit is connected to the first terminal of the signal output circuit, and the second terminal of the signal output circuit is connected to the second terminal of the second conversion circuit. The comparator circuit includes a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a fourth capacitor, a fifth capacitor, a sixth capacitor, and an operational amplifier; Wherein, the first end of the seventh resistor is connected to the ground terminal of the LED control circuit; the connection point between the second end of the seventh resistor and the first end of the sixth resistor is connected to the inverting input terminal of the operational amplifier; the connection point between the second end of the sixth resistor and the first end of the fifth resistor is connected to the output terminal of the operational amplifier; the second end of the fifth resistor is connected to the first terminal of the reference circuit; the first end of the eighth resistor is connected to the second terminal of the first conversion circuit; the connection point between the second end of the eighth resistor and the first end of the ninth resistor is connected to the non-inverting input terminal of the operational amplifier; the second end of the ninth resistor is connected to the ground terminal of the LED control circuit; the fourth capacitor is connected across the sixth resistor; the fifth capacitor is connected across the inverting and non-inverting input terminals of the operational amplifier; and the sixth capacitor is connected across the ninth capacitor.

2. The LED control circuit according to claim 1, wherein, The second switching circuit includes a second switch, a third switch, a fourth switch, and a fifth switch; The connection point between the source of the second switching transistor and the drain of the third switching transistor is connected to the first end of the second secondary winding of the transformer; the connection point between the drain of the second switching transistor and the drain of the fourth switching transistor is connected to the second end of the feedback circuit; the connection point between the source of the fourth switching transistor and the drain of the fifth switching transistor is connected to the second end of the second secondary winding of the transformer; and the connection point between the source of the third switching transistor and the source of the fifth switching transistor is connected to the ground terminal of the LED control circuit.

3. The LED control circuit according to claim 1, wherein, The reference circuit includes a fourth resistor, a voltage regulator, a second capacitor, and a third capacitor; Wherein, the connection point of the first terminal of the voltage regulator and the first terminal of the third capacitor is connected to the first terminal of the signal output circuit, the second terminal of the third capacitor is connected to the first terminal of the fourth resistor, the connection point of the second terminal of the voltage regulator and the second terminal of the fourth resistor is connected to the second terminal of the comparator circuit, the third terminal of the voltage regulator is connected to the ground terminal of the LED control circuit, the first terminal of the second capacitor is connected to the first terminal of the third capacitor, and the second terminal of the second capacitor is connected to the second terminal of the fourth resistor.

4. The LED control circuit according to claim 1, wherein, The signal output circuit includes a second resistor, a third resistor, and a first optocoupler; Wherein, the first end of the second resistor is connected to the second end of the second conversion circuit, the connection point between the second end of the second resistor and the first end of the third resistor is connected to the anode of the light-emitting diode of the first optocoupler, the connection point between the second end of the third resistor and the cathode of the light-emitting diode of the first optocoupler is connected to the second end of the reference circuit, the collector of the phototransistor of the first optocoupler is connected to the first signal feedback terminal of the control circuit, and the emitter of the phototransistor of the first optocoupler is connected to the ground terminal of the LED control circuit.

5. The LED control circuit according to claim 1, wherein, The feedback circuit also includes a first switching transistor; The drain of the first switching transistor is connected to the second terminal of the reference circuit, the source of the first switching transistor is connected to the ground terminal of the LED control circuit, and the gate of the first switching transistor is connected to the control circuit.

6. The LED control circuit according to claim 1, wherein, It also includes an energy storage circuit, which includes an energy storage battery and a first switch; The first switch is located between the first end of the energy storage battery and the second end of the second conversion circuit, and the second end of the energy storage battery is used to connect to the output end of the power generation equipment.

7. A control method, wherein, The control method is applied to the LED control circuit as described in any one of claims 1 to 6, wherein the execution subject of the control method is the control circuit, and the control method includes: In response to the power supply request of the LED lamp in the LED control circuit, the remaining power of the energy storage battery in the LED control circuit is determined; When the remaining power is less than or equal to a set threshold, the AC input source in the LED control circuit is controlled to output a first AC power, causing the transformer in the LED control circuit to output a second AC power. The first conversion circuit in the LED control circuit converts the second AC power and outputs it to the LED lamp. The second conversion circuit in the LED control circuit is controlled to operate at a set first conversion efficiency, causing the second conversion circuit to convert the second AC power into a first DC power. In response to the feedback signal output by the feedback circuit in the LED control circuit, the first AC power output by the AC input source is adjusted. When the remaining power is greater than a set threshold, the energy storage battery in the LED control circuit is controlled to output a second DC power to the second conversion circuit, and the second conversion circuit is controlled to operate at a set second conversion efficiency, so that the second conversion circuit converts the second DC power into a third AC power. The transformer responds to the third AC power and outputs a fourth AC power to the first conversion circuit. The first conversion circuit converts the fourth AC power and outputs it to the LED lamp.

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