Multi-output LED power supply circuit

Abstract

The utility model relates to the technical field of LED power supplies, in particular to a multiplexed output LED power supply circuit, which comprises a transformer T1, an LLC module, a linear voltage stabilization module, a safe current regulation module, a code clearing identification module and at least one current expansion output driving module, the output end of the safe current regulation module is electrically connected with the input end of the LLC module, the output end of the LLC module is electrically connected with the primary side of the transformer T1, the secondary side of the transformer T1 is electrically connected with the input end of the linear voltage stabilization module, and the output end of the linear voltage stabilization module is electrically connected with the current expansion output driving module and then connected with the output end of the LLC module. The current-expanding output driving modules are electrically connected with loads in a one-to-one correspondence manner, and the current-expanding output driving modules are electrically connected with the dimming module to realize dimming; the code clearing identification module is electrically connected between the safety current regulation module and the dimming module; the code clearing identification module is used for synchronizing the AC voltage to the dimming module; the problems that multi-path output current distribution is insufficient, the overall lighting effect is poor, and code clearing is not reliable are solved.

Description

Technical Field

[0001] This utility model relates to the field of LED power supply technology, and in particular to a multi-output LED power supply circuit. Background Technology

[0002] With the rapid development of modern lighting technology, LEDs (light-emitting diodes) have been widely used in various lighting systems due to their high efficiency, long lifespan, and environmental friendliness. To meet the lighting needs of different scenarios, intelligent dimming has become an indispensable part of LED lighting systems. Intelligent dimming not only adjusts brightness according to actual lighting requirements, achieving effective energy management, but also enhances the user experience and creates a more comfortable lighting environment.

[0003] Traditional LED power supply circuits typically consist of a rectifier circuit, an LLC resonant converter (LLC circuit), and a linear regulator circuit, achieving a single-channel output conversion from alternating current (AC) to direct current (DC). LLC circuits are widely used in LED power supply design due to their high efficiency, good voltage regulation capability, and small size. However, with the increasing demand for multi-channel dimming outputs in intelligent lighting systems, traditional single-output LED power supply circuits can no longer meet the needs of intelligent dimming.

[0004] First, simply adding more outputs to the existing LED power supply circuit can easily lead to uneven current distribution among the output ports due to the high-efficiency energy conversion characteristics of LLC circuits. This results in each output's dimming failing to match the preset brightness, affecting the overall lighting effect. Therefore, directly increasing the number of outputs is not an ideal solution.

[0005] Secondly, intelligent dimming systems are typically equipped with a dimming module to send dimming signals to the LED power supply, enabling the power supply to adjust the brightness of the connected LEDs according to preset logic. During the LED power supply shutdown or restart process, the dimming module needs to correctly identify its power status to perform a code clearing operation, ensuring accurate operation upon the next power-on. However, the design complexity of multi-output LED power supplies increases the difficulty for the dimming module to accurately identify the LED power supply's operating status, especially at the moment of power shutdown. Due to rapid changes in current and voltage, or feedback delays, the dimming module may fail to capture the shutdown signal in a timely and accurate manner, thus affecting the stability and reliability of the entire LED system. Utility Model Content

[0006] To address the aforementioned shortcomings, the purpose of this invention is to propose a multi-output LED power supply circuit that solves the problems of insufficient current distribution across multiple outputs, poor overall lighting effect, and unreliable code clearing.

[0007] To achieve this objective, the present invention adopts the following technical solution:

[0008] A multi-output LED power supply circuit includes a transformer T1, an LLC module, and a linear regulator module; it also includes a safety rectifier module, a code clearing and identification module, a dimming module, and at least one current-amplifying output driver module; the output terminal of the safety rectifier module is electrically connected to the input terminal of the LLC module, the output terminal of the LLC module is electrically connected to the primary side of the transformer T1, the secondary side of the transformer T1 is electrically connected to the input terminal of the linear regulator module, the output terminals of the linear regulator module are respectively electrically connected to the current-amplifying output driver modules, the current-amplifying output driver modules are each electrically connected to the load, and each current-amplifying output driver module is electrically connected to the dimming module to achieve dimming;

[0009] The code clearing and identification module is electrically connected between the safety rectification module and the dimming module; the code clearing and identification module is used to synchronize the AC voltage to the dimming module.

[0010] Furthermore, it also includes a fast discharge module; the output terminal of the linear voltage regulator module is connected in series with the fast discharge module, and then electrically connected to the current amplification output drive module respectively;

[0011] The fast discharge module is used to accelerate the discharge speed of the linear voltage regulator module when power is off.

[0012] Furthermore, it also includes an overvoltage feedback module; the input terminal of the overvoltage feedback module is electrically connected to the output terminal of the linear voltage regulator module, and the output terminal of the overvoltage feedback module is electrically connected to the current amplification output drive module.

[0013] The overvoltage feedback module is used to trigger the current amplification output drive module to shut down when an overvoltage is detected in the output voltage of the linear voltage regulator module.

[0014] Furthermore, the current-amplifying output drive module includes a driver U103, a MOSFET Q109, resistors R129 and R131, a diode D107, resistors R122 and R124, a MOSFET Q106, a diode D109, resistors R126 and R128, a MOSFET Q108, a bidirectional TVS diode TVS2, and a diode D111; the input terminal of the driver U103 is connected in series with resistor R131 and then electrically connected to the control terminal of the dimming module.

[0015] The GND terminal of the driver U103 is connected to the SGND ground terminal. The input terminal and GND terminal of the driver U103 are electrically connected to the drain and source of the MOS transistor Q109, respectively. The gate of the MOS transistor Q129 is connected to the output terminal of the overvoltage feedback module after being connected in series with the resistor R129.

[0016] One end of resistor R122, the cathode of diode D107, one end of resistor R126, and the cathode of diode D109 are all electrically connected to the output terminal of driver U103. The other end of resistor R122, the anode of diode D107, and one end of resistor R124 are all electrically connected to the gate of MOSFET Q106. The other end of resistor R126, the anode of diode D109, and one end of resistor R128 are all electrically connected to the gate of MOSFET Q108. The other end of resistor R124, the source of MOSFET Q106, the other end of resistor R128, the source of MOSFET Q108, and one end of bidirectional TVS diode TVS2 are all electrically connected to the negative terminal of the linear regulator module's output. The drain of MOSFET Q106, the drain of MOSFET Q108, and the other end of bidirectional TVS diode TVS2 are all electrically connected to the anode of diode D111. The cathode of diode D111 is electrically connected to the positive terminal of the linear regulator module's output.

[0017] Both the cathode and anode of the diode D111 are electrically connected to the load.

[0018] Furthermore, the code clearing and identification module includes diode D1, diode D2, resistors R1 and R2, capacitor C1, optocoupler OPT1, resistors R119 and R120, capacitor C107, Zener diode ZD102, capacitor CE107, transistor Q104, capacitor C110, voltage regulator chip U105, capacitor CE108, capacitor C111, and resistor R135; the anode of diode D1 is electrically connected to the live wire of the rectifier bridge input terminal of the safety rectifier module, the anode of diode D2 is electrically connected to the neutral wire of the rectifier bridge input terminal of the safety rectifier module, the cathode of diode D1 is electrically connected to the cathode of diode D2, the connection point of the cathode of diode D1 and the connection point of diode D2 are connected in series with resistors R1 and R2 and then electrically connected to the anode of optocoupler OPT1, the cathode of optocoupler OPT1 is connected to GND ground, and capacitor C1 is connected in parallel between the anode and cathode of optocoupler OPT1;

[0019] The collector of the optocoupler OPT1 is connected in series with the resistor R119 and then electrically connected to the collector of the transistor Q104. The connection point between the resistor R119 and the collector of the transistor Q104 is connected to the regulated power supply of the linear voltage regulator module. The emitter of the optocoupler OPT1, one end of the resistor R120, one end of the capacitor C107, and the cathode of the Zener diode ZD102 are all electrically connected to the base of the transistor Q104. The emitter of the transistor Q104, the anode of the capacitor CE107, and one end of the capacitor C110 are all connected to the voltage regulator chip U10. The input terminal of 5 is electrically connected. The output terminal of the voltage regulator chip U105, the positive terminal of the capacitor CE108, one end of the capacitor C111, and one end of the resistor R135 are all electrically connected to the power supply terminal of the dimming module. The other end of the resistor R120, the other end of the capacitor C107, the anode of the Zener diode ZD102, the negative terminal of the capacitor CE107, the other end of the capacitor C110, the GND terminal of the voltage regulator chip U105, the negative terminal of the capacitor CE108, the other end of the capacitor C111, and the other end of the resistor R135 are all connected to the SGND ground terminal.

[0020] Furthermore, the fast discharge module includes resistors R111, R114, R115, R116, R117, R118, MOSFETs Q101, Q102, Q103, and capacitor CE109; one end of resistor R114, one end of resistor R115, one end of resistor R117, and the positive terminal of capacitor CE109 are all electrically connected to the positive terminal of the linear regulator module's output. The other end of resistor R115, the other end of resistor R117, one end of resistor R116, and the other end of capacitor CE109 are all electrically connected to the positive terminal of the linear regulator module's output. One end of resistor R118, the drain of MOSFET Q102, and the drain of MOSFET Q103 are all electrically connected. The other end of resistor R114, the gate of MOSFET Q102, the gate of MOSFET Q103, and the drain of MOSFET Q101 are all electrically connected. The source of MOSFET Q101, the source of MOSFET Q102, the source of MOSFET Q103, and the negative terminal of capacitor CE109 are all connected to ground (SGND). The gate of MOSFET Q101 is connected in series with resistor R111 and then electrically connected to the regulated power supply of the linear regulator module.

[0021] Furthermore, the rectifier bridge of the safety rectifier module includes rectifier bridge BD1 and rectifier bridge BD2; the first input terminal and the second input terminal of rectifier bridge BD1 are both connected to the live wire, and the first input terminal and the second input terminal of rectifier bridge BD2 are both connected to the neutral wire.

[0022] The first output terminal of the rectifier bridge BD1 and the first output terminal of the rectifier bridge BD2 are electrically connected, and the second output terminal of the rectifier bridge BD1 and the second output terminal of the rectifier bridge BD2 are electrically connected, and together they are used as the output terminal of the safety rectification module.

[0023] Furthermore, the current-amplifying output drive module also includes a light-emitting diode LED1 and a resistor R133; the anode of the light-emitting diode LED1 is electrically connected to the cathode of the diode D111, and the cathode of the light-emitting diode LED1 is connected to the anode of the diode D111 after being connected in series with the resistor R133.

[0024] Furthermore, the overvoltage feedback module includes resistors R107, R108, R109, R110, R112, and R113, capacitors C104 and C105, and operational amplifier U102. Resistor R109 is connected in series with the negative output terminal of the linear regulator module. Resistors R107 and R108 are connected in parallel with resistor R109. The output terminal of resistor R109 is electrically connected to one end of resistor R110, and the other end of resistor R110 is connected to the negative output terminal of the linear regulator module. One end of capacitor C104 is electrically connected to the positive input terminal of operational amplifier U102. One end of resistor R112 is connected to the reference voltage. The other ends of resistor R112, resistor R113, and capacitor C105 are all electrically connected to the negative input terminal of operational amplifier U102. The other ends of capacitor C104, resistor R113, and capacitor C105 are all connected to SGND ground. The output terminal of operational amplifier U102 is electrically connected to the current amplification output drive module.

[0025] Furthermore, the code clearing and identification module also includes a switch K1, a resistor R136, and a resistor R137; one end of the resistor R136 is electrically connected to the power supply terminal of the dimming module, the other end of the resistor R136 and one end of the resistor R137 are both electrically connected to the reset terminal of the dimming module, the other end of the resistor R137 is electrically connected to one end of the switch K1, and the other end of the switch K1 is connected to the SGND ground terminal.

[0026] The technical solution provided by this utility model can include the following beneficial effects: the output terminal of the linear voltage regulator module is electrically connected to the current amplification output driver module with current amplification function to ensure sufficient output current, so that the LED power supply can achieve stable multi-channel output under the control of the dimming module, and ensure the overall lighting effect.

[0027] Meanwhile, to enable the dimming module to accurately identify the operating status of the LED power supply, a code clearing and identification module is placed between the safety rectifier module and the dimming module. This allows the AC voltage of the safety rectifier module to be directly synchronized to the dimming module, eliminating the need for the dimming module to detect the operating status of the LED power supply through the current amplification output driver module or the linear voltage regulator module. This eliminates interference from intermediate circuits and allows the dimming module to directly monitor the on / off status of the LED power supply from its input terminal. Consequently, the dimming module can clear the code in a timely manner, ensuring the stability and reliability of the entire LED system. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of a multi-output LED power supply circuit according to one embodiment of the present invention.

[0029] Figure 2 Is it like this? Figure 1 The circuit diagram shown is a multi-output LED power supply circuit. Figure 1 .

[0030] Figure 3 Is it like this? Figure 1 The circuit diagram shown is a multi-output LED power supply circuit. Figure 2 .

[0031] The components include: Transformer T1, LLC module 2, linear regulator module 3, safety rectifier module 1, code clearing and identification module 6, dimming module 5, current amplification output drive module 4, fast discharge module 7, overvoltage feedback module 8, driver U103, MOSFET Q109, resistor R129, resistor R131, diode D107, resistor R122, resistor R124, MOSFET Q106, diode D109, resistor R126, resistor R128, MOSFET Q108, bidirectional TVS diode TVS2, diode D111, diode D1, diode D2, resistor R1, resistor R2, capacitor C1, optocoupler OPT1, resistor R119, resistor R120, capacitor C107, and Zener diode ZD. 102, Capacitor CE107, Transistor Q104, Capacitor C110, Voltage Regulator Chip U105, Capacitor CE108, Capacitor C111, Resistor R135, Switch K1, Resistor R136, Resistor R137, Resistor R111, Resistor R114, Resistor R115, Resistor R116, Resistor R117, Resistor R118, MOSFET Q101, MOSFET Q102, MOSFET Q103, Capacitor CE109, Rectifier Bridge BD1, Rectifier Bridge BD2, Light Emitting Diode LED1, Resistor R133, Resistor R107, Resistor R108, Resistor R109, Resistor R110, Resistor R112, Resistor R113, Capacitor C104, Capacitor C105, Operational Amplifier U102. Detailed Implementation

[0032] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0033] In the description of embodiments of this utility model, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the stated features. In the description of embodiments of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0034] In the description of the embodiments of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this utility model according to the specific circumstances.

[0035] The following is combined Figures 1 to 3 This describes a multi-output LED power supply circuit according to an embodiment of the present invention.

[0036] A multi-output LED power supply circuit includes a transformer T1, an LLC module 2, and a linear regulator module 3; it also includes a safety rectifier module 1, a code clearing and identification module 6, a dimming module 5, and at least one current-amplifying output driver module 4; the output terminal of the safety rectifier module 1 is electrically connected to the input terminal of the LLC module 2, the output terminal of the LLC module 2 is electrically connected to the primary side of the transformer T1, the secondary side of the transformer T1 is electrically connected to the input terminal of the linear regulator module 3, the output terminals of the linear regulator module 3 are electrically connected to the current-amplifying output driver modules 4 respectively, the current-amplifying output driver modules 4 are electrically connected to the load one by one, and all current-amplifying output driver modules 4 are electrically connected to the dimming module 5 to achieve dimming;

[0037] The code clearing and identification module 6 is electrically connected between the safety rectification module 1 and the dimming module 5; the code clearing and identification module 6 is used to synchronize the AC voltage to the dimming module 5.

[0038] In a preferred embodiment of a multi-output LED power supply circuit proposed in this utility model, such as... Figures 1 to 3As shown, in the LED power supply circuit, the safety rectifier module 1 mainly consists of a series of safety circuits and a rectifier bridge; the LLC module 2 consists of a resonant dual-terminal controller U1 (such as an LZC3106A chip) and its peripheral circuits forming the LLC main circuit, while the optocoupler OPT2 and its peripheral circuits form a voltage feedback loop; the linear regulator module 3 consists of rectifier diodes and capacitors forming the rectifier and filter main output circuit, while the voltage regulator chip U101 and its peripheral circuits implement the linear regulation function, providing a regulated power supply (such as 7.5V); thus, the safety rectifier module 1, LLC module 2, transformer T1 and linear regulator module 3 are connected in sequence to form the main circuit of the LED power supply circuit.

[0039] Based on this, the output terminals of the linear voltage regulator module 3 are electrically connected to the current-amplifying output driver module 4 with current-amplifying function to ensure sufficient output current. Thus, under the control of the dimming module 5, the LED power supply can achieve stable multi-channel output and ensure the overall lighting effect.

[0040] Meanwhile, in order to enable the dimming module 5 to accurately identify the working status of the LED power supply, the code clearing and identification module 6 is set between the safety rectifier module 1 and the dimming module 5. This allows the AC voltage of the safety rectifier module 1 to be directly synchronized to the dimming module 5, so that the dimming module 5 does not need to detect the working status of the LED power supply through the current amplification output driver module 4 or the linear voltage regulator module 3, eliminating the interference of intermediate circuits. It can directly monitor the on / off status of the LED power supply from the input terminal of the LED power supply, and thus the dimming module 5 can clear the code in time, ensuring the stability and reliability of the entire LED system.

[0041] Furthermore, it also includes a fast discharge module 7; the output terminal of the linear voltage regulator module 3 is connected in series with the fast discharge module 7, and then electrically connected to the current amplification output drive module 4 respectively;

[0042] The fast discharge module 7 is used to accelerate the discharge speed of the linear voltage regulator module 3 when power is off.

[0043] In this embodiment, since the LED power supply may need to increase its power to support more outputs, the output of the linear regulator module 3 will not be interrupted immediately after the LED power supply is turned off, but will decrease slowly. This will result in different time delays in the loads connected to the multiple outputs. Taking LED lamps as an example, multiple LED lamps will turn off slowly at different times, resulting in a poor overall lighting experience. Therefore, after connecting the fast discharge module 7 in series at the output of the linear regulator module 3, it is then electrically connected to the current amplification output drive module 4 to accelerate the discharge speed of the linear regulator module 3 when the power is off, thereby accelerating the shutdown of the load.

[0044] Furthermore, it also includes an overvoltage feedback module 8; the input terminal of the overvoltage feedback module 8 is electrically connected to the output terminal of the linear voltage regulator module 3, and the output terminal of the overvoltage feedback module 8 is electrically connected to the current amplification output drive module 4.

[0045] The overvoltage feedback module 8 is used to trigger the current amplification output drive module 4 to shut down when an overvoltage is detected in the output voltage of the linear regulator module 3.

[0046] In this embodiment, since the LED power supply bears a large load, the damage caused by an overvoltage fault in the LED power supply is extremely serious. Therefore, an overvoltage feedback module 8 is required to detect the voltage condition between the output of the linear voltage regulator module 3 and the current amplification output driver module 4, so as to ensure that the current amplification output driver module 4 is shut down in time and the load stops working when an overvoltage fault occurs.

[0047] Furthermore, the current amplification output drive module 4 includes a driver U103, a MOSFET Q109, resistors R129 and R131, a diode D107, resistors R122 and R124, a MOSFET Q106, a diode D109, resistors R126 and R128, a MOSFET Q108, a bidirectional TVS diode TVS2, and a diode D111; the input terminal of the driver U103 is connected to the control terminal of the dimming module 5 after being connected in series with resistor R131.

[0048] The GND terminal of driver U103 is connected to the SGND ground terminal. The input terminal and GND terminal of driver U103 are electrically connected to the drain and source of MOSFET Q109, respectively. The gate of MOSFET Q129 is connected to the output terminal of overvoltage feedback module 8 after series resistor R129.

[0049] One end of resistor R122, the cathode of diode D107, one end of resistor R126, and the cathode of diode D109 are all electrically connected to the output terminal of driver U103. The other end of resistor R122, the anode of diode D107, and one end of resistor R124 are all electrically connected to the gate of MOSFET Q106. The other end of resistor R126, the anode of diode D109, and one end of resistor R128 are all electrically connected to the gate of MOSFET Q108. The other end of resistor R124, the source of MOSFET Q106, the other end of resistor R128, the source of MOSFET Q108, and one end of bidirectional TVS diode TVS2 are all electrically connected to the negative terminal of the output terminal of linear regulator module 3. The drain of MOSFET Q106, the drain of MOSFET Q108, and the other end of bidirectional TVS diode TVS2 are all electrically connected to the anode of diode D111. The cathode of diode D111 is electrically connected to the positive terminal of the output terminal of linear regulator module 3.

[0050] Both the cathode and anode of diode D111 are electrically connected to the load.

[0051] In this embodiment, the current-amplifying output drive module 4 connects MOSFETs Q106 and Q108 in parallel between the positive and negative terminals of the linear voltage regulator module 3 to control a single-channel output. Multiple current-amplifying output drive modules 4 share the positive terminal of the linear voltage regulator module 3 and extend the negative terminal of the linear voltage regulator module 3 to form multiple outputs. Based on this, the current-amplifying output drive module 4 receives the dimming signal from the dimming module 5 through the driver U103 (such as N531), and controls the switching of MOSFETs Q106 and Q108 according to the dimming logic to adjust the duty cycle of the single-channel output. At the same time, because dual MOSFETs are used to control the single-channel output, the output current is increased, achieving the purpose of current amplification. More importantly, a MOSFET Q109 is cleverly placed between the input terminal and the GND terminal of the driver U103. Overvoltage protection can be achieved using the MOSFET Q109. When the overvoltage feedback module 8 triggers the MOSFET Q109 to conduct, the input terminal of the driver U103 is grounded, turning off the driver U103.

[0052] Furthermore, the code recognition module 6 includes diodes D1 and D2, resistors R1 and R2, capacitor C1, optocoupler OPT1, resistors R119 and R120, capacitor C107, Zener diode ZD102, capacitor CE107, transistor Q104, capacitor C110, voltage regulator chip U105, capacitor CE108, capacitor C111, and resistor R135; the anode of diode D1 is electrically connected to the live wire of the rectifier bridge input terminal of the safety rectifier module 1, the anode of diode D2 is electrically connected to the neutral wire of the rectifier bridge input terminal of the safety rectifier module 1, the cathode of diode D1 is electrically connected to the cathode of diode D2, the connection point of the cathode of diode D1 and diode D2 is connected in series with resistors R1 and R2 and then electrically connected to the anode of optocoupler OPT1, the cathode of optocoupler OPT1 is connected to the GND ground terminal, and capacitor C1 is connected in parallel between the anode and cathode of optocoupler OPT1;

[0053] The collector of optocoupler OPT1 is connected in series with resistor R119 and then electrically to the collector of transistor Q104. The connection point between resistor R119 and the collector of transistor Q104 is connected to the voltage regulator module 3. The emitter of optocoupler OPT1, one end of resistor R120, one end of capacitor C107, and the cathode of Zener diode ZD102 are all electrically connected to the base of transistor Q104. The emitter of transistor Q104, the positive terminal of capacitor CE107, and one end of capacitor C110 are all connected to voltage regulator chip U105. The input terminal is electrically connected. The output terminal of the voltage regulator chip U105, the positive terminal of capacitor CE108, one end of capacitor C111, and one end of resistor R135 are all electrically connected to the power supply terminal of the dimming module 5. The other end of resistor R120, the other end of capacitor C107, the anode of Zener diode ZD102, the negative terminal of capacitor CE107, the other end of capacitor C110, the GND terminal of voltage regulator chip U105, the negative terminal of capacitor CE108, the other end of capacitor C111, and the other end of resistor R135 are all connected to the SGND ground terminal.

[0054] In this embodiment, the voltage regulator chip U105 (such as a 3.3V voltage regulator chip with model number 111733E316) and its peripheral circuit in the code clearing and identification module 6 provide a stable power supply for the dimming module 5. The AC voltage can be monitored in real time by connecting the optocoupler OPT1 to the front side of the rectifier bridge of the safety rectifier module 1. When the LED power supply is cut off, the transistor Q104 can be disconnected through the optocoupler OPT1 to stop the power supply to the dimming module 5, so that the dimming module 5 can directly sense the LED power supply failure and clear the code.

[0055] It should be noted that, in order to avoid the LED power supply being interrupted and causing the dimming module 5 to misjudge and clear the code, the dimming module 5 can be set to reset and clear the code after detecting multiple power outages (e.g., 6 times).

[0056] Furthermore, the fast discharge module 7 includes resistors R111, R114, R115, R116, R117, and R118, MOSFETs Q101, Q102, and Q103, and capacitor CE109. One end of resistor R114, one end of resistor R115, one end of resistor R117, and the positive terminal of capacitor CE109 are all electrically connected to the positive terminal of the output of the linear voltage regulator module 3. The other end of resistor R115, the other end of resistor R117, and one end of resistor R116 are also connected to the positive terminal of the linear voltage regulator module 3. One end of resistor R118, the drain of MOSFET Q102, and the drain of MOSFET Q103 are electrically connected. The other end of resistor R114, the gate of MOSFET Q102, the gate of MOSFET Q103, and the drain of MOSFET Q101 are electrically connected. The source of MOSFET Q101, the source of MOSFET Q102, the source of MOSFET Q103, and the negative terminal of capacitor CE109 are all connected to the SGND ground terminal. The gate of MOSFET Q101 is connected to the regulated power supply of linear regulator module 3 after being connected in series with resistor R111.

[0057] In this embodiment, the fast discharge module 7 consists of resistors R111, R114, R115, R116, R117, and R118, MOSFETs Q101, Q102, and Q103, and capacitor CE109 forming multiple discharge circuits. When MOSFET Q101 detects that the linear regulator module 3 is powered off, it causes capacitor CE109 and the capacitors in the linear regulator module 3 to discharge rapidly through multiple discharge circuits.

[0058] Furthermore, the rectifier bridge of the safety rectifier module 1 includes rectifier bridge BD1 and rectifier bridge BD2; the first input terminal and the second input terminal of rectifier bridge BD1 are both connected to the live wire, and the first input terminal and the second input terminal of rectifier bridge BD2 are both connected to the neutral wire.

[0059] The first output terminal of rectifier bridge BD1 and the first output terminal of rectifier bridge BD2 are electrically connected, and the second output terminal of rectifier bridge BD1 and the second output terminal of rectifier bridge BD2 are electrically connected, and together they are used as the output terminal of safety rectifier module 1.

[0060] In this embodiment, in order to adapt to high power output and support multiple outputs, the LED power supply circuit preferably consists of rectifier bridges BD1 and BD2 connected in parallel to amplify the current. Furthermore, the parallel connection of rectifier bridges BD1 and BD2 can also distribute the current evenly, avoid uneven heating of the two rectifier bridges, and improve the stability of the subsequent circuits of the safety rectifier module 1.

[0061] Furthermore, the current amplification output drive module 4 also includes a light-emitting diode LED1 and a resistor R133; the anode of the light-emitting diode LED1 is electrically connected to the cathode of the diode D111, and the cathode of the light-emitting diode LED1 is connected to the anode of the diode D111 after being connected in series with the resistor R133.

[0062] In this embodiment, since there are many output circuits of the LED power supply, the detection of the working status of multiple output circuits requires connecting a load to each circuit, resulting in low detection efficiency. Therefore, by connecting a light-emitting diode (LED1) (without limiting color or specifications) to the end of each output circuit, a quick preliminary observation can be made through the LED1.

[0063] Furthermore, the overvoltage feedback module 8 includes resistors R107, R108, R109, R110, R112, and R113, capacitors C104 and C105, and operational amplifier U102. Resistor R109 is connected in series with the negative terminal of the linear regulator module 3. Resistors R107 and R108 are connected in parallel with resistor R109. The output terminal of resistor R109 is electrically connected to one end of resistor R110, and the other end of resistor R110... One end of capacitor C104 is electrically connected to the positive input terminal of operational amplifier U102. One end of resistor R112 is connected to the reference voltage. The other ends of resistor R112, one end of resistor R113, and one end of capacitor C105 are all electrically connected to the negative input terminal of operational amplifier U102. The other ends of capacitor C104, one end of resistor R113, and one end of capacitor C105 are all connected to the SGND ground terminal. The output terminal of operational amplifier U102 is electrically connected to the current amplification output drive module 4.

[0064] In this embodiment, the overvoltage feedback module 8 mainly consists of an operational amplifier U102 and its peripheral circuits forming a signal amplification circuit. After voltage sampling at the negative terminal of the linear voltage regulator module 3, the signal is amplified and fed back to the current amplification output drive module 4. When an overvoltage fault occurs, the MOS transistor Q109 driving the current amplification output drive module 4 is turned on, triggering the current amplification output drive module 4 to turn off, thereby achieving overvoltage protection.

[0065] Furthermore, the code clearing and identification module 6 also includes a switch K1, a resistor R136, and a resistor R137; one end of the resistor R136 is electrically connected to the power supply terminal of the dimming module 5, the other end of the resistor R136 and one end of the resistor R137 are both electrically connected to the reset terminal of the dimming module 5, the other end of the resistor R137 is electrically connected to one end of the switch K1, and the other end of the switch K1 is connected to the SGND ground terminal.

[0066] In this embodiment, the code clearing identification module 6 also uses switch K1, resistor R136 and resistor R137 to form a manual code clearing circuit, so that when the dimming module 5 cannot clear the code normally, or when the user has a code clearing requirement, manual code clearing can be achieved by operating switch K1.

[0067] Other configurations and operations of a multi-output LED power supply circuit according to an embodiment of the present invention are known to those skilled in the art and will not be described in detail here.

[0068] In this specification, the terms "embodiment," "example," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0069] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A multi-output LED power supply circuit, comprising a transformer T1, an LLC module and a linear voltage stabilizing module; characterized in that: It also includes a safety rectification module, a code clearing and identification module, a dimming module, and at least one current-amplifying output driver module; the output terminal of the safety rectification module is electrically connected to the input terminal of the LLC module, the output terminal of the LLC module is electrically connected to the primary side of the transformer T1, the secondary side of the transformer T1 is electrically connected to the input terminal of the linear voltage regulator module, the output terminals of the linear voltage regulator module are respectively electrically connected to the current-amplifying output driver modules, the current-amplifying output driver modules are electrically connected to the load one by one, and the current-amplifying output driver modules are all electrically connected to the dimming module to realize dimming; The code clearing and identification module is electrically connected between the safety rectification module and the dimming module; the code clearing and identification module is used to synchronize the AC voltage to the dimming module.

2. The multi-output LED power supply circuit according to claim 1, wherein: It also includes a fast discharge module; the output terminal of the linear voltage regulator module is connected in series with the fast discharge module, and then electrically connected to the current amplification output drive module respectively; The fast discharge module is used to accelerate the discharge speed of the linear voltage regulator module when power is off.

3. The multi-output LED power supply circuit according to claim 1, wherein: It also includes an overvoltage feedback module; the input terminal of the overvoltage feedback module is electrically connected to the output terminal of the linear voltage regulator module, and the output terminal of the overvoltage feedback module is electrically connected to the current amplification output drive module. The overvoltage feedback module is used to trigger the current amplification output drive module to shut down when an overvoltage is detected in the output voltage of the linear voltage regulator module.

4. The multi-output LED power supply circuit according to claim 3, characterized in that: The current-amplifying output drive module includes a driver U103, a MOSFET Q109, resistors R129 and R131, a diode D107, resistors R122 and R124, a MOSFET Q106, a diode D109, resistors R126 and R128, a MOSFET Q108, a bidirectional TVS diode TVS2, and a diode D111; the input terminal of the driver U103 is connected in series with resistor R131 and then electrically connected to the control terminal of the dimming module. The GND terminal of the driver U103 is connected to the SGND ground terminal. The input terminal and GND terminal of the driver U103 are electrically connected to the drain and source of the MOS transistor Q109, respectively. The gate of the MOS transistor Q129 is connected to the output terminal of the overvoltage feedback module after being connected in series with the resistor R129. One end of resistor R122, the cathode of diode D107, one end of resistor R126, and the cathode of diode D109 are all electrically connected to the output terminal of driver U103. The other end of resistor R122, the anode of diode D107, and one end of resistor R124 are all electrically connected to the gate of MOSFET Q106. The other end of resistor R126, the anode of diode D109, and one end of resistor R128 are all electrically connected to the gate of MOSFET Q108. The other end of resistor R124, the source of MOSFET Q106, the other end of resistor R128, the source of MOSFET Q108, and one end of bidirectional TVS diode TVS2 are all electrically connected to the negative terminal of the linear regulator module's output. The drain of MOSFET Q106, the drain of MOSFET Q108, and the other end of bidirectional TVS diode TVS2 are all electrically connected to the anode of diode D111. The cathode of diode D111 is electrically connected to the positive terminal of the linear regulator module's output. Both the cathode and anode of the diode D111 are electrically connected to the load.

5. The multi-output LED power supply circuit according to claim 1, characterized in that: The code recognition module includes diode D1, diode D2, resistors R1 and R2, capacitor C1, optocoupler OPT1, resistors R119 and R120, capacitor C107, Zener diode ZD102, capacitor CE107, transistor Q104, capacitor C110, voltage regulator chip U105, capacitor CE108, capacitor C111, and resistor R135. The anode of diode D1 is electrically connected to the live wire of the rectifier bridge input of the safety rectifier module, the anode of diode D2 is electrically connected to the neutral wire of the rectifier bridge input of the safety rectifier module, the cathode of diode D1 is electrically connected to the cathode of diode D2, the connection point of the cathode of diode D1 and the connection point of diode D2 are connected in series with resistors R1 and R2 and then electrically connected to the anode of optocoupler OPT1, the cathode of optocoupler OPT1 is connected to GND ground, and capacitor C1 is connected in parallel between the anode and cathode of optocoupler OPT1. The collector of the optocoupler OPT1 is connected in series with the resistor R119 and then electrically connected to the collector of the transistor Q104. The connection point between the resistor R119 and the collector of the transistor Q104 is connected to the regulated power supply of the linear voltage regulator module. The emitter of the optocoupler OPT1, one end of the resistor R120, one end of the capacitor C107, and the cathode of the Zener diode ZD102 are all electrically connected to the base of the transistor Q104. The emitter of the transistor Q104, the anode of the capacitor CE107, and one end of the capacitor C110 are all connected to the voltage regulator chip U10. The input terminal of 5 is electrically connected. The output terminal of the voltage regulator chip U105, the positive terminal of the capacitor CE108, one end of the capacitor C111, and one end of the resistor R135 are all electrically connected to the power supply terminal of the dimming module. The other end of the resistor R120, the other end of the capacitor C107, the anode of the Zener diode ZD102, the negative terminal of the capacitor CE107, the other end of the capacitor C110, the GND terminal of the voltage regulator chip U105, the negative terminal of the capacitor CE108, the other end of the capacitor C111, and the other end of the resistor R135 are all connected to the SGND ground terminal.

6. The multi-output LED power supply circuit according to claim 2, characterized in that: The fast discharge module includes resistors R111, R114, R115, R116, R117, and R118, MOSFETs Q101, Q102, and Q103, and capacitor CE109. One end of resistor R114, one end of resistor R115, one end of resistor R117, and the positive terminal of capacitor CE109 are all electrically connected to the positive output terminal of the linear voltage regulator module. The other end of resistor R115, the other end of resistor R117, one end of resistor R116, and resistor R118 are all connected to the positive output terminal of the linear voltage regulator module. One end of resistor R114, the drain of MOSFET Q102, and the drain of MOSFET Q103 are electrically connected. The other end of resistor R114, the gate of MOSFET Q102, the gate of MOSFET Q103, and the drain of MOSFET Q101 are electrically connected. The source of MOSFET Q101, the source of MOSFET Q102, the source of MOSFET Q103, and the negative terminal of capacitor CE109 are all connected to ground (SGND). The gate of MOSFET Q101 is connected in series with resistor R111 and then electrically connected to the regulated power supply of the linear regulator module.

7. The multi-output LED power supply circuit according to claim 1, characterized in that: The rectifier bridge of the safety rectifier module includes rectifier bridge BD1 and rectifier bridge BD2; the first input terminal and the second input terminal of rectifier bridge BD1 are both connected to the live wire, and the first input terminal and the second input terminal of rectifier bridge BD2 are both connected to the neutral wire. The first output terminal of the rectifier bridge BD1 and the first output terminal of the rectifier bridge BD2 are electrically connected, and the second output terminal of the rectifier bridge BD1 and the second output terminal of the rectifier bridge BD2 are electrically connected, and together they are used as the output terminal of the safety rectification module.

8. A multi-output LED power supply circuit according to claim 4, characterized in that: The current-amplifying output drive module also includes a light-emitting diode LED1 and a resistor R133; the anode of the light-emitting diode LED1 is electrically connected to the cathode of the diode D111, and the cathode of the light-emitting diode LED1 is connected to the anode of the diode D111 after being connected in series with the resistor R133.

9. A multi-output LED power supply circuit according to claim 3, characterized in that: The overvoltage feedback module includes resistors R107, R108, R109, R110, R112, and R113, capacitors C104 and C105, and operational amplifier U102. Resistor R109 is connected in series with the negative terminal of the linear regulator module's output. Resistors R107 and R108 are connected in parallel with resistor R109. The output terminal of resistor R109 is electrically connected to one end of resistor R110, and the other end of resistor R110 is connected to capacitor C105. One end of 104 is electrically connected to the positive input terminal of the operational amplifier U102. One end of the resistor R112 is connected to the reference voltage. The other end of the resistor R112, one end of the resistor R113, and one end of the capacitor C105 are all electrically connected to the negative input terminal of the operational amplifier U102. The other end of the capacitor C104, the other end of the resistor R113, and the other end of the capacitor C105 are all connected to the SGND ground terminal. The output terminal of the operational amplifier U102 is electrically connected to the current amplification output drive module.

10. A multi-output LED power supply circuit according to claim 5, characterized in that: The code clearing and identification module also includes a switch K1, a resistor R136, and a resistor R137; one end of the resistor R136 is electrically connected to the power supply terminal of the dimming module, the other end of the resistor R136 and one end of the resistor R137 are both electrically connected to the reset terminal of the dimming module, the other end of the resistor R137 is electrically connected to one end of the switch K1, and the other end of the switch K1 is connected to the SGND ground terminal.

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