Long and narrow ultrathin LED isolation driving power supply capable of automatically preventing fire

Abstract

The invention discloses a long and narrow ultrathin LED isolation driving power supply capable of automatically preventing a fire disaster. The long and narrow ultrathin LED isolation driving power supply comprises an input filtering module, a PFC module, a main control module, a transformer T1, an output filtering module, an isolation feedback module, a resistor R1 and a thermistor R13, the PFC module is connected among the input filtering module, the main control module and an Np winding of the transformer T1; one end of the resistor R1 is connected with one end of a Na winding of the transformer T1 and the main control module, the other end of the resistor R1 is connected with one end of the thermistor R13 and the main control module, and the other end of the thermistor R13 is connected with a GND end; the output filtering module is connected with an Ns winding of the transformer T1 and a load; through the circuit, an over-temperature protection point can be set at will, when the temperature of the power supply reaches the over-temperature protection point, the power supply is automatically turned off, and the LED lamp is turned off accordingly; and when the power supply is cooled, the power supply is automatically turned on, and the LED lamp is turned on, thereby preventing fire disasters caused by combustibles on fire due to over-high temperature of the LED isolation driving power supply.

Description

Technical Field

[0001] The invention relates to the field of LED power supplies, and in particular to a narrow and ultra-thin LED isolation driving power supply capable of automatically preventing fire. Background Art

[0002] For narrow slit application scenarios with small spaces, the LED isolation driver power supply not only requires the power supply to be narrow in size and shape and very thin in thickness, but also because of the lack of ventilation and poor heat dissipation in such scenarios, it is very easy to cause serious fire accidents due to overheating of the power supply. To avoid fire, the existing technical solution is to install the power supply in a ventilated place outside the slit of the power user, and then connect the wires to the slit. This method occupies the space outside the power user, while affecting the beauty of the power user and the overall space, and increasing the wire material and installation costs. Secondly, the temperature detection function in the existing LED power supply requires the main control chip to have a temperature detection port, which has high requirements for the selection of the main control chip, and undoubtedly imposes certain restrictions on the cost and material supply. Therefore, there is an urgent need for a narrow and ultra-thin LED isolation driver power supply that can automatically prevent fire to solve the above problems. Summary of the invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides a narrow and thin LED isolation driving power supply that can automatically prevent fire.

[0004] An embodiment of the present invention solves the technical problem by adopting a technical solution: a narrow and thin LED isolation driving power supply capable of automatically preventing fire, comprising an input filter module, a PFC module, a main control module, a transformer T1, an output filter module, an isolation feedback module, a resistor R1 and a thermistor R13;

[0005] The input filter module is connected to the external power supply;

[0006] The PFC module is connected between the input filter module, the main control module and the Np winding of the transformer T1;

[0007] One end of the resistor R1 is connected to one end of the Na winding of the transformer T1 and the main control module, the other end of the resistor R1 is respectively connected to one end of the thermistor R13 and the main control module, and the other end of the thermistor R13 is connected to the GND end;

[0008] The output filter module is connected to the Ns winding of the transformer T1 and the load;

[0009] The isolation feedback module is connected between the main control module and the output filter module;

[0010] The main control module can control the transformer T1 to disconnect the energy output when the thermistor R13 detects that the ambient temperature is higher than a preset value, or control the transformer T1 to resume the energy output when the thermistor R13 detects that the ambient temperature is lower than a preset value.

[0011] As one of the preferred embodiments of the present invention, the input filter module includes a fuse F1, a varistor MOV1, an inductor LF2-LF3, resistors R30-R32, an inductor L1, a rectifier bridge BD1, a capacitor CBB1 and capacitors CX1-CX3, one end of the fuse F1 is connected to the live wire L, the other end of the fuse F1 is connected to the first end of the inductor LF2 and one end of the varistor MOV1, the other end of the varistor MOV1 is connected to the second end of the inductor LF2 and the neutral line N, the third end of the inductor LF2 is respectively connected to the first end of the inductor LF3, one end of the resistor R30 and one end of the capacitor CX1, the fourth end of the inductor LF2 is connected to the second end of the inductor LF3, the resistor R31 and the other end of capacitor CX1, the other end of resistor R30 is connected to the other end of resistor R31, the third end of inductor LF3 is respectively connected to one end of inductor L1, one end of resistor R32 and one end of capacitor CX2, the fourth end of inductor LF3 is connected to the other end of capacitor CX2, one end of capacitor CX3 and the first input end of rectifier bridge BD1, the other end of inductor L1 is connected to the other end of resistor R32, the other end of capacitor CX3 and the second input end of rectifier bridge BD1, one end of capacitor CBB1 is connected to the first output end of rectifier bridge BD1 and the PFC module, and one end of capacitor CBB1 is connected to the second output end of rectifier bridge BD1 and GND.

[0012] As one of the preferred embodiments of the present invention, the PFC module includes a control chip U2, an inductor T2, a diode D3, resistors R23-R29, a capacitor E1 and capacitors C15-C20, one end of the inductor T2 is connected to the input filter module, and the other end of the inductor T2 is connected to the anode of the diode D3 and the DRA of the control chip U2. IN pin is connected, the cathode of diode D3 is connected to one end of resistor R29, one end of capacitor E1, one end of capacitor C20, one end of capacitor C16, main control module and Np winding of transformer T1, the other end of resistor R29 is connected to one end of resistor R26, one end of capacitor C19 and FB pin of control chip U2 through resistor R28, resistor R27, the COMP pin of control chip U2 is connected to one end of capacitor C17 and one end of capacitor C18, the other end of capacitor C18 is connected to the other end of capacitor C17 and GND through resistor R25, the VCC pin of control chip U2 is connected to GND through capacitor C15, resistor R23 and resistor R24 ​​are connected in parallel between the CS pin and GND of control chip U2, the other end of capacitor E1, the other end of capacitor C20, the other end of capacitor C16, the other end of resistor R26 and the other end of capacitor C19 are connected to GND.

[0013] As one of the preferred embodiments of the present invention, the main control module includes a control chip U1, a MOS tube Q1, diodes D1-D2, a diode D4, resistors R3-R5, resistors R10-R11, resistors R15-R16, resistors R18-R21, capacitors C3, capacitors C7-C8, capacitor C11 and capacitor E2;

[0014] One end of the resistor R3 is respectively connected to the PFC module, one end of the capacitor C11, one end of the capacitor C7, one end of the resistor R20, and one end of the Np winding of the transformer T1. The other end of the resistor R3 is connected to one end of the resistor R10, one end of the capacitor E2, one end of the capacitor C3, and the VDD pin of the control chip U1 through the resistor R4 and the resistor R5. The other end of the resistor R10 is connected to one end of the resistor R1 and one end of the Na winding of the transformer T1 through the diode D1. The other end of the capacitor C11, the other end of the capacitor C7, and the other end of the resistor R20 are connected to the other end of the Np winding of the transformer T1 and the drain of the MOS tube Q1 through the resistor R21 and the diode D4.

[0015] The gate of the MOS tube Q1 is connected to one end of the resistor R15, one end of the resistor R11 and the anode of the diode D2. The cathode of the diode D2 is connected to the other end of the resistor R11 and the GATE pin of the control chip U1 via the resistor R35. The source of the MOS tube Q1 is respectively connected to one end of the resistor R19, the other end of the resistor R15, one end of the resistor R18 and one end of the resistor R16. The CS pin of the control chip U1 is connected to the other end of the resistor R16 and is connected to the GND terminal via the capacitor C8.

[0016] The COMP pin of the control chip U1 is connected to the isolation feedback module, the FB pin of the control chip U1 is connected to the other end of the resistor R1 and one end of the thermistor R13, and the GND pin of the control chip U1, the other end of the capacitor E2, the other end of the capacitor C3, the other end of the resistor R18, and the other end of the resistor R19 are connected to the GND end.

[0017] As one of the preferred embodiments of the present invention, the model of the control chip U1 is set to MK2687.

[0018] As one of the preferred embodiments of the present invention, the output filter module includes a diode D5, an inductor LF1, a capacitor C2, a capacitor C6, a capacitor E3, a resistor R6 and a resistor R17. The anode of the diode D5 is connected to one end of the Ns winding of the transformer T1 and one end of the resistor R17. The other end of the resistor R17 is connected to the cathode of the diode D5, one end of the capacitor E3, one end of the capacitor C2, one end of the resistor R6, the first end of the inductor LF1 and the isolation feedback module through the capacitor C6. The other end of the Ns winding of the transformer T1, the other end of the capacitor E3, the other end of the capacitor C2, the other end of the resistor R6, and the second end of the inductor LF1 are connected to the SGND end. The third end of the inductor LF1 and the fourth end of the inductor LF1 are used to connect the load.

[0019] As one of the preferred embodiments of the present invention, the isolation feedback module includes an optocoupler U3, a control chip U4, a capacitor C1, capacitors C4-C5, a resistor R2, resistors R7-R9 and a resistor R12, one end of the optocoupler U3 light emitter is connected to one end of the resistor R2 and is connected to one end of the resistor R8, one end of the resistor R9 and the output filter module via the resistor R7, the other end of the optocoupler U3 light emitter is connected to the other end of the resistor R2, one end of the resistor R14 and the first end of the control chip U4, the other end of the resistor R14 is connected to the other end of the resistor R8, the other end of the resistor R9, one end of the resistor R12, one end of the capacitor C4 and the second end of the control chip U4 via the capacitor C5, the other end of the resistor R12, the other end of the capacitor C4 and the third end of the control chip U4, one end of the optocoupler U3 light receiver is connected to one end of the capacitor C1 and the main control module, and the other end of the optocoupler U3 light receiver is connected to the other end of the capacitor C1 and the GND end.

[0020] The beneficial effects of the present invention are as follows: a narrow and ultra-thin LED isolation driving power supply capable of automatically preventing fire, comprising an input filtering module, a PFC module, a main control module, a transformer T1, an output filtering module, an isolation feedback module, a resistor R1 and a thermistor R13; the PFC module is connected between the input filtering module, the main control module and the Np winding of the transformer T1; one end of the resistor R1 is connected to one end of the Na winding of the transformer T1 and the main control module, the other end of the resistor R1 is respectively connected to one end of the thermistor R13 and the main control module, and the other end of the thermistor R13 is connected to the GND end; the output filtering module is connected to the Ns winding of the transformer T1 and the load; the over-temperature protection point can be arbitrarily set through the above circuit, when the power supply temperature reaches the over-temperature protection point, the power supply is automatically shut down, and the LED lamp is extinguished; when the power supply is cooled, it is automatically turned on again, and the LED lamp is on, so as to prevent the temperature of the LED isolation driving power supply from being too high, causing the combustibles to catch fire and cause a fire. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0022] Figure 1 The circuit schematic diagram of a narrow and thin LED isolation driving power supply capable of automatically preventing fire;

[0023] Figure 2 This is the circuit schematic diagram of the input filter module;

[0024] Figure 3 This is the circuit schematic diagram of the PFC module;

[0025] Figure 4 This is the circuit schematic diagram of the main control module;

[0026] Figure 5 This is the circuit schematic diagram of the output filter module;

[0027] Figure 6 This is the circuit schematic diagram of the isolated feedback module. DETAILED DESCRIPTION

[0028] This section will describe in detail the specific embodiments of the present invention. The preferred embodiments of the present invention are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present invention, but it cannot be understood as a limitation on the scope of protection of the present invention.

[0029] In the description of the present invention, the meaning of "above", "below", "exceed", etc. is not inclusive of the number itself, and the meaning of "above", "below", "within", etc. is inclusive of the number itself. If there is a description of "first" or "second", it is only used to distinguish the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0030] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., and orientations or positional relationships indicated are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0031] In the present invention, unless otherwise clearly defined, the words "set", "install", "connect" and the like should be understood in a broad sense, for example, they can be directly connected or indirectly connected through an intermediate medium; they can be fixedly connected or detachably connected or integrally formed; they can be mechanically connected; they can be the internal connection of two elements or the interaction relationship between two elements. Those skilled in the art can reasonably determine the specific meanings of the above words in the present invention in combination with the specific content of the technical solution.

[0032] Reference Figures 1 to 6 , a narrow and ultra-thin LED isolation driving power supply capable of automatically preventing fire, comprising an input filter module 10, a PFC module 20, a main control module 30, a transformer T1, an output filter module 40, an isolation feedback module 50, a resistor R1 and a thermistor R13;

[0033] The input filter module 10 is connected to an external power source;

[0034] The PFC module 20 is connected between the input filter module 10, the main control module 30 and the Np winding of the transformer T1;

[0035] One end of the resistor R1 is connected to one end of the Na winding of the transformer T1 and the main control module 30, the other end of the resistor R1 is connected to one end of the thermistor R13 and the main control module 30, and the other end of the thermistor R13 is connected to the GND end;

[0036] The output filter module 40 is connected to the Ns winding of the transformer T1 and the load;

[0037] The isolation feedback module 50 is connected between the main control module 30 and the output filter module 40;

[0038] The main control module 30 can control the transformer T1 to disconnect the energy output when the ambient temperature detected by the thermistor R13 is higher than a preset value, or control the transformer T1 to resume the energy output when the ambient temperature detected by the thermistor R13 is lower than a preset value.

[0039] 1)Reference Figure 1 and Figure 2 In the present invention, the input ends of the input filter module 10 are respectively connected to the live wire L and the neutral wire L of the AC power supply, so as to filter out the common mode interference, clutter, etc. in the AC power supply, and output a relatively clean DC voltage to the subsequent circuit.

[0040] In some embodiments, the input filter module 10 includes a fuse F1, a varistor MOV1, an inductor LF2-LF3, resistors R30-R32, an inductor L1, a rectifier bridge BD1, a capacitor CBB1 and capacitors CX1-CX3, one end of the fuse F1 is connected to the live wire L, the other end of the fuse F1 is connected to the first end of the inductor LF2 and one end of the varistor MOV1, the other end of the varistor MOV1 is connected to the second end of the inductor LF2 and the neutral line N, the third end of the inductor LF2 is respectively connected to the first end of the inductor LF3, one end of the resistor R30 and one end of the capacitor CX1, the fourth end of the inductor LF2 is connected to the second end of the inductor LF3, one end of the resistor R31 And the other end of the capacitor CX1, the other end of the resistor R30 is connected to the other end of the resistor R31, the third end of the inductor LF3 is respectively connected to one end of the inductor L1, one end of the resistor R32 and one end of the capacitor CX2, the fourth end of the inductor LF3 is connected to the other end of the capacitor CX2, one end of the capacitor CX3 and the first input end of the rectifier bridge BD1, the other end of the inductor L1 is connected to the other end of the resistor R32, the other end of the capacitor CX3 and the second input end of the rectifier bridge BD1, one end of the capacitor CBB1 is connected to the first output end of the rectifier bridge BD1 and the PFC module 20, and one end of the capacitor CBB1 is connected to the second output end of the rectifier bridge BD1 and the GND end.

[0041] Specifically, after the live wire L and the neutral wire N are input, they enter the varistor MOV1 through the fuse F1, and then pass through the common mode inductor LF2 and the common mode inductor LF3 and the safety capacitors CX1-CX3, and are then rectified by the rectifier bridge BD1, and finally output high-quality DC power.

[0042] 2)Reference Figure 1 and Figure 3The voltage output by the input filter module 10 is improved by the PFC module 20 to improve the power factor. In some embodiments, the PFC module 20 includes a control chip U2, an inductor T2, a diode D3, resistors R23-R29, a capacitor E1 and capacitors C15-C20. One end of the inductor T2 is connected to the input filter module 10, and the other end of the inductor T2 is connected to the anode of the diode D3 and the DRA of the control chip U2. IN pin is connected, the cathode of diode D3 is connected to one end of resistor R29, one end of capacitor E1, one end of capacitor C20, one end of capacitor C16, main control module 30 and Np winding of transformer T1, the other end of resistor R29 is connected to one end of resistor R26, one end of capacitor C19 and FB pin of control chip U2 through resistor R28, resistor R27, the COMP pin of control chip U2 is connected to one end of capacitor C17 and one end of capacitor C18, the other end of capacitor C18 is connected to the other end of capacitor C17 and GND through resistor R25, the VCC pin of control chip U2 is connected to GND through capacitor C15, resistor R23 and resistor R24 ​​are connected in parallel between the CS pin and GND of control chip U2, the other end of capacitor E1, the other end of capacitor C20, the other end of capacitor C16, the other end of resistor R26 and the other end of capacitor C19 are connected to GND.

[0043] 3)Reference Figure 1 and Figure 4, the main control module 30 controls the energy conversion of the transformer T1 according to the output feedback of the isolation feedback module 50 received by it. In some embodiments, the main control module 30 includes a control chip U1, a MOS tube Q1, a diode D1-D2, a diode D4, resistors R3-R5, resistors R10-R11, resistors R15-R16, resistors R18-R21, capacitors C3, capacitors C7-C8, capacitor C11 and capacitor E2; one end of the resistor R3 is respectively connected to the PFC module 20, one end of the capacitor C11, one end of the capacitor C7, one end of the resistor R20 and one end of the Np winding of the transformer T1, the other end of the resistor R3 is connected to one end of the resistor R10, one end of the capacitor E2, one end of the capacitor C3 and the VDD pin of the control chip U1 through the resistor R4 and the resistor R5, the other end of the resistor R10 is connected to one end of the resistor R1 and one end of the Na winding of the transformer T1 through the diode D1, the other end of the capacitor C11, the other end of the capacitor C7, The other end of the resistor R20 is connected to the other end of the Np winding of the transformer T1 and the drain of the MOS transistor Q1 via the resistor R21 and the diode D4; the gate of the MOS transistor Q1 is connected to one end of the resistor R15, one end of the resistor R11 and the anode of the diode D2; the cathode of the diode D2 is connected to the other end of the resistor R11 and the GATE pin of the control chip U1 via the resistor R35; the source of the MOS transistor Q1 is respectively connected to one end of the resistor R19, the other end of the resistor R15, one end of the resistor R18 and one end of the resistor R16; the CS pin of the control chip U1 is connected to the other end of the resistor R16 and is connected to the GND terminal via the capacitor C8; the COMP pin of the control chip U1 is connected to the isolation feedback module 50; the FB pin of the control chip U1 is connected to the other end of the resistor R1 and one end of the thermistor R13; the GND pin of the control chip U1, the other end of the capacitor E2, the other end of the capacitor C3, the other end of the resistor R18 and the other end of the resistor R19 are connected to the GND terminal.

[0044] Specifically, the resistor R13 connected to the FB pin of the control chip U1 adopts a negative temperature coefficient thermistor, so that the resistor R13 also has the function of a temperature probe, and the Na winding of the transformer T1 senses the output voltage of the Ns winding of the transformer T1 in real time, and inputs it to the FB pin of the control chip U1 after the voltage is divided by the resistor R1 and the resistor R13. The control chip U1 internally detects the voltage of the FB pin at the demagnetization moment, and compares it with the internal reference voltage of the control chip U1 after sampling and holding; when the power supply temperature rises, the resistance value of the thermistor R13 decreases, and the voltage of the FB pin of the control chip U1 decreases accordingly. When the temperature rises to exceed the over-temperature protection point, the voltage of the FB pin of the control chip U1 drops to below the power supply shutdown threshold voltage, the power supply is automatically shut down, and the LED light goes out; When the power is turned off, the temperature starts to drop, the resistance of the resistor R13 increases, and the voltage of the FB pin of the control chip U1 increases accordingly. When the temperature is lower than the over-temperature protection point, the voltage of the FB pin of the control chip U1 rises to a voltage higher than the power shutdown threshold voltage, the power is automatically turned on, and the LED lights up; further, the control chip U1 outputs a PWM signal through the GATE pin according to the voltage of the FB pin, and then controls the energy input to the transformer T1 by controlling the conduction degree of the MOS tube Q1, thereby realizing the control of the output; as a preferred embodiment of the control chip U1, the model of the control chip U1 is set to MK2687. Through the above-mentioned circuit structure, a conventional control chip can realize the temperature detection function, which reduces the requirements for the selection of the control chip U1.

[0045] 4)Reference Figure 1 and Figure 5 The energy output by the Ns winding of the transformer T1 is first filtered by the output filter module 40 and then provided to the load, thereby providing a voltage with higher quality. In some embodiments, the output filter module 40 includes a diode D5, an inductor LF1, a capacitor C2, a capacitor C6, a capacitor E3, a resistor R6 and a resistor R17. The anode of the diode D5 is connected to one end of the Ns winding of the transformer T1 and one end of the resistor R17. The other end of the resistor R17 is connected to the cathode of the diode D5, one end of the capacitor E3, one end of the capacitor C2, one end of the resistor R6, the first end of the inductor LF1 and the isolation feedback module 50 through the capacitor C6. The other end of the Ns winding of the transformer T1, the other end of the capacitor E3, the other end of the capacitor C2, the other end of the resistor R6, and the second end of the inductor LF1 are connected to the SGND end. The third end of the inductor LF1 and the fourth end of the inductor LF1 are used to connect the load; LC filtering is achieved by the cooperation of the capacitor and the resistor, and the common mode interference is further filtered out by the common mode inductor LF1.

[0046] 5)Reference Figure 1 and Figure 6, the feedback module 50 is isolated by setting an isolation feedback module 50, which includes an optocoupler U3, a control chip U4, a capacitor C1, a capacitor C4-C5, a resistor R2, a resistor R7-R9 and a resistor R12, one end of the optocoupler U3 light emitter is connected to one end of the resistor R2 and is connected to one end of the resistor R8, one end of the resistor R9 and the output filter module 40 through the resistor R7, the other end of the optocoupler U3 light emitter is connected to the other end of the resistor R2, one end of the resistor R14 and the first end of the control chip U4, the other end of the resistor R14 is connected to the other end of the resistor R8, the other end of the resistor R9, one end of the resistor R12, one end of the capacitor C4 and the second end of the control chip U4 through the capacitor C5, the other end of the resistor R12, the other end of the capacitor C4 and the third end of the control chip U4, one end of the optocoupler U3 light receiver is connected to one end of the capacitor C1 and the main control module, and the other end of the optocoupler U3 light receiver is connected to the other end of the capacitor C1 and the GND end.

[0047] 6) The advantage of the present invention is that the over-temperature protection point can be set arbitrarily through the above circuit. When the power supply temperature reaches the over-temperature protection point, the power supply is automatically shut down and the LED light is turned off; when the power supply cools down, it is automatically turned on again and the LED light is turned on, preventing the LED isolation drive power supply temperature from being too high, causing combustibles to ignite and cause a fire.

[0048] Of course, the present invention is not limited to the above-mentioned embodiments, and those skilled in the art may make equivalent modifications or substitutions without violating the spirit of the present invention. These equivalent modifications and substitutions are all included in the scope defined by the claims of this application.

Claims

1. A narrow and ultra-thin LED isolation driving power supply that can automatically prevent fire, characterized in that: It comprises an input filter module (10), a PFC module (20), a main control module (30), a transformer T1, an output filter module (40), an isolation feedback module (50), a resistor R1 and a thermistor R13; The input filter module (10) is connected to an external power supply; The PFC module (20) is connected between the input filter module (10), the main control module (30) and the Np winding of the transformer T1; One end of the resistor R1 is connected to one end of the Na winding of the transformer T1 and the main control module (30), the other end of the resistor R1 is respectively connected to one end of the thermistor R13 and the main control module (30), and the other end of the thermistor R13 is connected to the GND end; The output filter module (40) is connected to the Ns winding of the transformer T1 and the load; The isolation feedback module (50) is connected between the main control module (30) and the output filter module (40); The main control module (30) can control the transformer T1 to disconnect energy output when the ambient temperature detected by the thermistor R13 is higher than a preset value, or control the transformer T1 to resume energy output when the ambient temperature detected by the thermistor R13 is lower than a preset value.

2. The narrow and thin LED isolation driving power supply capable of automatically preventing fire according to claim 1, characterized in that: The input filter module (10) comprises a fuse F1, a varistor MOV1, an inductor LF2-LF3, resistors R30-R32, an inductor L1, a rectifier bridge BD1, a capacitor CBB1 and capacitors CX1-CX3, one end of the fuse F1 is connected to the live wire L, the other end of the fuse F1 is connected to the first end of the inductor LF2 and one end of the varistor MOV1, the other end of the varistor MOV1 is connected to the second end of the inductor LF2 and the neutral line N, the third end of the inductor LF2 is respectively connected to the first end of the inductor LF3, one end of the resistor R30 and one end of the capacitor CX1, the fourth end of the inductor LF2 is connected to the second end of the inductor LF3, one end of the resistor R31 and the capacitor CBB1, The other end of the inductor L1 is connected to the other end of the resistor R32, the other end of the resistor R31 is connected, the third end of the inductor LF3 is respectively connected to one end of the inductor L1, one end of the resistor R32 and one end of the capacitor CX2, the fourth end of the inductor LF3 is connected to the other end of the capacitor CX2, one end of the capacitor CX3 and the first input end of the rectifier bridge BD1, the other end of the inductor L1 is connected to the other end of the resistor R32, the other end of the capacitor CX3 and the second input end of the rectifier bridge BD1, one end of the capacitor CBB1 is connected to the first output end of the rectifier bridge BD1 and the PFC module (20), and one end of the capacitor CBB1 is connected to the second output end of the rectifier bridge BD1 and the GND end.

3. The narrow and thin LED isolation driving power supply capable of automatically preventing fire according to claim 1, characterized in that: The PFC module (20) comprises a control chip U2, an inductor T2, a diode D3, resistors R23-R29, a capacitor E1 and capacitors C15-C20, one end of the inductor T2 is connected to the input filter module (10), the other end of the inductor T2 is connected to the anode of the diode D3 and the DRAIN pin of the control chip U2, the cathode of the diode D3 is connected to one end of the resistor R29, one end of the capacitor E1, one end of the capacitor C20, one end of the capacitor C16, the main control module (30) and the Np winding of the transformer T1, the other end of the resistor R29 is connected to the resistor R28, the resistor R27 and the resistor R The first terminal of the control chip U2 is connected to one end of the capacitor E1, one end of the capacitor C20, one end of the capacitor C16, and the other end of the capacitor C19. The second terminal of the control chip U2 is connected to one end of the capacitor E2, one end of the capacitor C26, and the FB pin of the control chip U2. The COMP pin of the control chip U2 is connected to one end of the capacitor C17 and one end of the capacitor C18. The other end of the capacitor C18 is connected to the other end of the capacitor C17 and the GND terminal via the resistor R25. The VCC pin of the control chip U2 is connected to the GND terminal via the capacitor C15. The resistors R23 and R24 are connected in parallel between the CS pin of the control chip U2 and the GND terminal. The other end of the capacitor E1, the other end of the capacitor C20, the other end of the capacitor C16, the other end of the resistor R26, and the other end of the capacitor C19 are connected to the GND terminal.

4. The narrow and thin LED isolation driving power supply capable of automatically preventing fire according to claim 1, characterized in that: The main control module (30) comprises a control chip U1, a MOS tube Q1, diodes D1-D2, a diode D4, resistors R3-R5, resistors R10-R11, resistors R15-R16, resistors R18-R21, a capacitor C3, capacitors C7-C8, a capacitor C11 and a capacitor E2; One end of the resistor R3 is respectively connected to the PFC module (20), one end of the capacitor C11, one end of the capacitor C7, one end of the resistor R20 and one end of the Np winding of the transformer T1; the other end of the resistor R3 is connected to one end of the resistor R10, one end of the capacitor E2, one end of the capacitor C3 and the VDD pin of the control chip U1 via the resistor R4 and the resistor R5; the other end of the resistor R10 is connected to one end of the resistor R1 and one end of the Na winding of the transformer T1 via the diode D1; the other end of the capacitor C11, the other end of the capacitor C7 and the other end of the resistor R20 are connected to the other end of the Np winding of the transformer T1 and the drain of the MOS tube Q1 via the resistor R21 and the diode D4; The gate of the MOS tube Q1 is connected to one end of the resistor R15, one end of the resistor R11 and the anode of the diode D2. The cathode of the diode D2 is connected to the other end of the resistor R11 and the GATE pin of the control chip U1 via the resistor R35. The source of the MOS tube Q1 is respectively connected to one end of the resistor R19, the other end of the resistor R15, one end of the resistor R18 and one end of the resistor R16. The CS pin of the control chip U1 is connected to the other end of the resistor R16 and is connected to the GND terminal via the capacitor C8. The COMP pin of the control chip U1 is connected to the isolation feedback module (50), the FB pin of the control chip U1 is connected to the other end of the resistor R1 and one end of the thermistor R13, and the GND pin of the control chip U1, the other end of the capacitor E2, the other end of the capacitor C3, the other end of the resistor R18, and the other end of the resistor R19 are connected to the GND end.

5. The narrow and thin LED isolation driving power supply capable of automatically preventing fire according to claim 4, characterized in that: The model of the control chip U1 is set to MK2687.

6. The narrow and thin LED isolation driving power supply capable of automatically preventing fire according to claim 1, characterized in that: The output filter module (40) comprises a diode D5, an inductor LF1, a capacitor C2, a capacitor C6, a capacitor E3, a resistor R6 and a resistor R17; the anode of the diode D5 is connected to one end of the Ns winding of the transformer T1 and one end of the resistor R17; the other end of the resistor R17 is connected to the cathode of the diode D5, one end of the capacitor E3, one end of the capacitor C2, one end of the resistor R6, a first end of the inductor LF1 and the isolation feedback module (50) via the capacitor C6; the other end of the Ns winding of the transformer T1, the other end of the capacitor E3, the other end of the capacitor C2, the other end of the resistor R6 and the second end of the inductor LF1 are connected to the SGND end; the third end of the inductor LF1 and the fourth end of the inductor LF1 are used to connect to a load.

7. The narrow and thin LED isolation driving power supply capable of automatically preventing fire according to claim 1, characterized in that: The isolation feedback module (50) comprises an optical coupler U3, a control chip U4, a capacitor C1, capacitors C4-C5, a resistor R2, resistors R7-R9 and a resistor R12; one end of the light emitter of the optical coupler U3 is connected to one end of the resistor R2 and is connected to one end of the resistor R8, one end of the resistor R9 and the output filter module (40) via the resistor R7; the other end of the light emitter of the optical coupler U3 is connected to the other end of the resistor R2, one end of the resistor R14 and a first end of the control chip U4; the other end of the resistor R14 is connected to the other end of the resistor R8, the other end of the resistor R9, one end of the resistor R12, one end of the capacitor C4 and a second end of the control chip U4 via the capacitor C5; the other end of the resistor R12, the other end of the capacitor C4 and a third end of the control chip U4; one end of the light receiver of the optical coupler U3 is connected to one end of the capacitor C1 and the main control module; the other end of the light receiver of the optical coupler U3 is connected to the other end of the capacitor C1 and a GND end.

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