CN215898053U

CN215898053U - LED navigation light control system

Info

Publication number: CN215898053U
Application number: CN202122387217.0U
Authority: CN
Inventors: 严小科; 蒋成鹏; 刘成
Original assignee: Zhejiang Hule Electrical Equipment Manufacturing Co ltd
Current assignee: Zhejiang Hule Electrical Equipment Manufacturing Co ltd
Priority date: 2021-09-28
Filing date: 2021-09-28
Publication date: 2022-02-22
Anticipated expiration: 2031-09-28

Abstract

The utility model provides an LED navigation light control system, which solves the problems of poor illumination stability of navigation lights and the like and comprises a rectifying circuit connected with an alternating current circuit, wherein the rectifying circuit is connected with an LED driving circuit through a first filter circuit, the first filter circuit and the LED driving circuit are connected with a second filter circuit through a transformer T, the second filter circuit is connected with a power supply end through an amplifying circuit, the LED driving circuit adopts a primary side feedback LED driving chip, the dimming end of the primary side feedback LED driving chip is connected with a photosensitive resistor RL, the photosensitive resistor RL is opposite to a light emitting diode D1 on a single chip microcomputer, the single chip microcomputer is connected with a navigation light switching circuit and an alarm detection circuit, and the single chip microcomputer is connected with a time relay J1. The utility model has the advantages of stable illumination, good detection effect and the like.

Description

LED navigation light control system

Technical Field

The utility model belongs to the technical field of LED control, and particularly relates to an LED navigation light control system.

Background

The navigation light is a signal light which is used for indicating the position and the movement direction of the navigation light when an aircraft or a ship navigates at night and is convenient to avoid and identify each other. Generally, red lights are arranged at the left wingtip of an airplane, green lights are arranged at the right wingtip of the airplane, and white lights are arranged at the tail wing end of the airplane; the left side of the helicopter body is provided with a red light, the right side is provided with a green light, the tail end is provided with a white light, and the tip of the rotor wing is provided with the red light. A red light is arranged on the port of the ship, a green light is arranged on the starboard, and white lights are arranged on the mast and the stern of the ship; a non-motorized watercraft bulwark light; wooden sail boats are fitted with a white light. The luminous intensity of the LED navigation lamp commonly used at present can be degraded after the LED navigation lamp is used for a period of time. Generally, a third-party detection mechanism is adopted at home and abroad to carry out an accelerated aging test on the LED light source of the navigation signal lamp, the duration that the light source of the navigation signal lamp meets the minimum luminous intensity is given, and the production date and the replacement time of the light source are marked at the obvious position on the lamp, so that great light source waste is caused, and the problem that the navigation signal lamp can continuously keep the light source to meet the minimum luminous intensity after being used cannot be perfectly solved. In addition, the LED light source cannot automatically adjust the luminous intensity to ensure the stable output of the illumination in the use process.

In order to solve the defects of the prior art, people have long searched for and put forward various solutions. For example, chinese patent document discloses a rapid detection system and a rapid detection method for navigation light distribution [201710733987.1], which includes: the device comprises an optical screen, an illumination detection device and a controller; eight rails which are arranged in a shape of Chinese character 'mi' are arranged on the optical screen, and one surface of the optical screen, which is provided with the rails, is opposite to the light-emitting surface of the navigation lamp; during detection, the central positions of the track arrangement are aligned with the central point of the light emitting surface of the navigation light, and one end of each track, which is far away from the central position, extends out of the illumination area; the illuminance detection device comprises eight first probes distributed on each track and a second probe arranged at the central position; the controller controls the first probe to move on each track and detects the illumination at different positions; controlling the second probe to detect the illumination at the central position; and determining the light intensity conditions of the navigation light at different angles according to the illumination detection data and the detection position.

The scheme solves the problem of detection of the illumination intensity of the navigation light to a certain extent, but the scheme still has a plurality of defects, such as the problem that the minimum luminous intensity of the navigation light cannot be maintained.

Disclosure of Invention

The utility model aims to solve the problems and provides an LED navigation light control system which is reasonable in design and can effectively maintain the luminous intensity.

In order to achieve the purpose, the utility model adopts the following technical scheme: the LED navigation light control system comprises a rectification circuit connected with an alternating current circuit, wherein the rectification circuit is connected with an LED driving circuit through a first filter circuit, the first filter circuit and the LED driving circuit are connected with a second filter circuit through a transformer T, the second filter circuit is connected with a power supply end through an amplifying circuit, the LED driving circuit adopts a primary side feedback LED driving chip, the dimming end of the primary side feedback LED driving chip is connected with a photoresistor RL, the photoresistor RL is opposite to a light emitting diode D1 on a single chip microcomputer, the single chip microcomputer is connected with a navigation light switching circuit and an alarm detection circuit, the single chip microcomputer is connected with a time relay J1, the alarm detection circuit comprises a plurality of detection relays J2 connected with the single chip microcomputer, the detection relays J2 are grounded through a third filter circuit, the third filter circuit comprises a third filter resistor R13 and a third filter capacitor C1 which are grounded in parallel, the power supply end is grounded through a fourth filter circuit, the fourth filter circuit is provided with a plurality of fourth filter capacitors C2 which are connected in parallel and protected by grounding, the rectifying circuit is provided with a bridge rectifier BR connected with an alternating current circuit, a safety F is connected between the bridge rectifier BR and the alternating current circuit in series, the bridge rectifier BR is grounded by adopting a signal, and the bridge rectifier BR is connected with a thermistor RT and an alternating current relay J3 in parallel. The LED driving circuit is used for driving the navigation light source to normally emit light, and constant output is realized by matching the photoresistor RL and the single chip microcomputer, so that stable illumination intensity of the navigation light is ensured.

In the LED navigation light control system, the navigation light switching circuit comprises a plurality of light source circuits connected with the single chip microcomputer in parallel, each light source circuit is provided with a current-limiting resistor R14 and an LED light D8 which are connected in series, a key switch S is connected between each light source circuit and the single chip microcomputer in series, and a reset circuit is connected between each key switch S and the single chip microcomputer. The alarm detection circuit detects each light source, and detection accuracy is guaranteed.

In the above LED navigation light control system, the reset circuit includes a first reset resistor R15 and a second reset resistor R16 connected between the key switch S and the single chip microcomputer and connected in series with the reset pin of the single chip microcomputer. The navigation light switching circuit is matched with the reset circuit to automatically reset the single chip microcomputer after the navigation light is switched on and switched off, so that the operation stability of the single chip microcomputer is ensured.

In the above LED navigation light control system, the first reset resistor R15 and the second reset resistor R16 are connected to the power supply terminal and grounded through the first reset capacitor C3, and the second reset capacitor C4 is connected in parallel to the key switch S.

In the above LED navigation light control system, the first filter circuit includes an inductor L and a first filter resistor R17, which are arranged in parallel, and a signal ground is performed between the inductor L and the rectifier circuit 1 through a first electrolytic capacitor C5, and a signal ground is performed between the inductor L and the LED driving circuit through a first filter capacitor C6. The rectifying circuit converts alternating current into stable direct current and leads the stable direct current into the LED driving circuit.

In the above LED navigation light control system, the second filter circuit includes an output rectifier diode D2 and a second filter diode D3 connected between the transformer T and the amplifying circuit, a second polar electrolytic capacitor C7, a first current limiting resistor R18 and a second current limiting resistor R19 connected in parallel between the output rectifier diode D2 and the transformer T and protected by ground, and a first voltage stabilizing diode D4 connected in series to the second current limiting resistor R19.

In the above LED navigation light control system, the amplifying circuit includes a ground-protected transistor Q, an amplifying active electrolytic capacitor C8 is connected between the transistor Q and the second filter circuit, and a first voltage-stabilizing capacitor C9 and a second voltage-stabilizing capacitor C10 are connected between the transistor Q and the power supply terminal. The transformer T utilizes the inductor to provide current for the power supply end, and the second filter circuit and the amplifying circuit are matched to control the circuit to be opened and closed.

In the LED navigation light control system, the model of CRM6123/5 is selected as the primary side feedback LED driving chip of the LED driving circuit, the power supply end of the primary side feedback LED driving chip is connected with the first filter circuit, the power supply end of the primary side feedback LED driving chip is connected with the dimming end, and the grounding end of the primary side feedback LED driving chip is in signal grounding.

In the LED navigation light control system, the current sampling end and the MOS grid driving end of the primary side feedback LED driving chip are connected with the transformer T through the N-channel insulated gate field effect transistor, and the feedback end of the auxiliary coil of the primary side feedback LED driving chip is connected with the transformer T and the power supply end. The CRM6123/5 type chip selected by the LED driving circuit has better load regulation rate and linear regulation rate, and has better open-circuit protection, short-circuit protection, over-temperature protection, overvoltage protection and undervoltage protection.

In the above LED navigation light control system, a first resistor R1 and a second resistor R2 are connected in series between a power supply terminal and a first filter circuit, the power supply terminal is connected with a third resistor R3, a dimming terminal is connected with a fourth resistor R4, the third resistor R3 and the fourth resistor R4 are signal grounded through a second zener diode D5, a photo resistor RL connected with the dimming terminal is signal grounded, a current sampling terminal is signal grounded through a fifth resistor R5 and a sixth resistor R6 which are connected in parallel, a seventh resistor R7 and a seventh resistor R7 are signal grounded through an eighth resistor R8 are connected in series between a MOS gate drive terminal and an N-channel insulated gate field effect transistor, a feedback terminal of an auxiliary coil is signal grounded through a ninth resistor R9, a tenth resistor R10 is connected between the feedback terminal of the auxiliary coil and a transformer T, a current limiting diode D6 and an eleventh resistor R11 are connected in series between the tenth resistor R10 and the power supply terminal, the transformer T is connected with a transformation filter resistor R20 and a transformation filter capacitor C11 in parallel, a buffer diode D7 is connected between the transformation filter resistor R20 and the transformation filter capacitor C11 and the transformer T in series, the transformer T is connected with an ampere capacitor C12 connected with a signal ground in parallel, a light-emitting diode D1 on the single chip microcomputer is connected with the ground, and a twelfth resistor R12 is connected between the single chip microcomputer and the transformer T. The LED driving circuit realizes constant current control without an optical coupler and secondary feedback.

Compared with the prior art, the utility model has the advantages that: the LED driving circuit adopts a primary side feedback LED driving chip and is matched with the single chip to ensure the stable illumination intensity of the navigation lamp; periodically detecting the navigation light source in time, and giving an alarm when the illumination intensity is attenuated excessively; the primary side feedback LED driving chip is selected for the LED driving circuit, so that the navigation lamp is well protected.

Drawings

FIG. 1 is a circuit schematic of the present invention;

FIG. 2 is a schematic circuit diagram of the single-chip microcomputer of the present invention;

FIG. 3 is a partial connection diagram of the single-chip microcomputer of the present invention;

FIG. 4 is a circuit schematic of a fourth filter circuit of the present invention;

FIG. 5 is a circuit schematic of the alarm detection circuit of the present invention;

FIG. 6 is another circuit schematic of the alarm detection circuit of the present invention;

FIG. 7 is a schematic view of the construction of the position light of the present invention;

in the figure, a rectifying circuit 1, a photosensitive element 11, a first filter circuit 2, an LED driving circuit 3, a second filter circuit 4, an amplifying circuit 5, a primary side feedback LED driving chip 6, a single chip microcomputer 7, a position light switching circuit 8, a light source circuit 81, a reset circuit 82, an alarm detection circuit 9, a third filter circuit 91 and a fourth filter circuit 92.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

As shown in fig. 1-7, the LED position light control system includes a rectifying circuit 1 connected to an ac circuit, the rectifying circuit 1 is connected to an LED driving circuit 3 through a first filter circuit 2, the first filter circuit 2 and the LED driving circuit 3 are connected to a second filter circuit 4 through a transformer T, the second filter circuit 4 is connected to a power supply terminal through an amplifying circuit 5, the LED driving circuit 3 employs a primary feedback LED driving chip 6, a light modulation terminal of the primary feedback LED driving chip 6 is connected to a photo resistor RL, the photo resistor RL is opposite to a light emitting diode D1 on a single chip microcomputer 7, the single chip microcomputer 7 is connected to a position light switching circuit 8 and an alarm detection circuit 9, the single chip microcomputer 7 is connected to a time relay J1, the alarm detection circuit 9 includes a plurality of detection relays J2 connected to the single chip microcomputer 7, the detection relays J2 are grounded through a third filter circuit 91, the third filter circuit 91 includes a third filter resistor R13 and a third filter capacitor C1 which are grounded in parallel, the power supply terminal is grounded through a fourth filter circuit 92, the fourth filter circuit 92 has a plurality of fourth filter capacitors C2 which are protected in parallel by grounding, the rectifier circuit 1 has a bridge rectifier BR connected with an alternating current circuit, a fuse F is connected in series between the bridge rectifier BR and the alternating current circuit, the bridge rectifier BR is grounded by signals, and the bridge rectifier BR is connected with a thermistor RT and an alternating current relay J3 in parallel. The rectifying circuit 1 converts alternating current into direct current, the direct current is filtered by the first filter circuit 2 and then is LED into the LED driving circuit 3, the LED driving circuit 3 transforms voltage through the transformer T and outputs current to the second filter circuit 4 for further filtering processing, the amplifying circuit 5 controls the on-off of the navigation light, the photoresistor RL and the light emitting diode D1 relatively adjust the output current of the LED driving circuit 3 to ensure the current stability, and the alarm detection circuit 9 in the single chip microcomputer 7 periodically detects the illumination intensity of the navigation light under the action of the time relay J1.

Specifically, the navigation light switching circuit 8 includes a plurality of light source circuits 81 connected in parallel with the single chip microcomputer 7, the light source circuits 81 include a current limiting resistor R14 and an LED lamp D8 connected in series, a key switch S is connected in series between the light source circuits 81 and the single chip microcomputer 7, and a reset circuit 82 is connected between the key switch S and the single chip microcomputer 7. The detection relay J2 in the alarm detection circuit 9 is matched with a photosensitive element to output high and low levels to the single chip microcomputer 7 when the illumination attenuation is too large, wherein the third filter circuit 91 and the fourth filter circuit 92 play a role in filtering the detection relay J2.

Further, the reset circuit 82 includes a first reset resistor R15 and a second reset resistor R16 connected between the key switch S and the single chip microcomputer 7 and connected in series with the reset pin of the single chip microcomputer 7.

Obviously, the first reset resistor R15 and the second reset resistor R16 are connected to the power supply terminal and grounded through the first reset capacitor C3, and the second reset capacitor C4 is connected in parallel to the key switch S. The LED lamp D8 of the light source circuit 81 is a navigation light source, and the on/off is controlled by the key switch S, and when the key switch S is pressed, the potential of the single chip 7 is reset, wherein the reset circuit 82 performs ground protection.

Further, the first filter circuit 2 includes an inductor L and a first filter resistor R17, which are arranged in parallel, and a signal ground is performed between the inductor L and the rectifier circuit 1 through a first electrolytic capacitor C5, and a signal ground is performed between the inductor L and the LED driving circuit 3 through a first filter capacitor C6. The rectifying circuit 1 converts alternating current into direct current, and the direct current is matched with the first filter circuit 2 to filter and stabilize the current.

Further, the second smoothing circuit 4 includes an output rectifying diode D2 and a second smoothing diode D3 connected between the transformer T and the amplifying circuit 5, a second polar electrolytic capacitor C7, a first current limiting resistor R18 and a second current limiting resistor R19 connected in parallel with ground protection between the output rectifying diode D2 and the transformer T, and a first voltage stabilizing diode D4 connected in series with the second current limiting resistor R19. The second filter circuit 4 filters the current led out by the transformer T, and the current is led into the amplifying circuit 5 and then used for supplying power to the navigation light.

Preferably, the amplifying circuit 5 includes a ground-protected transistor Q, an amplifying and polarized capacitor C8 is connected between the transistor Q and the second filter circuit 4, and a first voltage-stabilizing capacitor C9 and a second voltage-stabilizing capacitor C10 are connected between the transistor Q and the power supply terminal.

In addition, the primary side feedback LED driving chip 6 of the LED driving circuit 3 is of a CRM6123/5 model, a power supply end of the primary side feedback LED driving chip 6 is connected with the first filter circuit 2, a power supply end of the primary side feedback LED driving chip 6 is connected with the dimming end, a grounding end of the primary side feedback LED driving chip 6 is grounded through signals, a current sampling end and an MOS grid driving end of the primary side feedback LED driving chip 6 are connected with the transformer T through an N-channel insulated grid field effect transistor, and an auxiliary coil feedback end of the primary side feedback LED driving chip 6 is connected with the transformer T and the power supply end. The CRM6123/5 type chip selected by the LED driving circuit 3 is provided with open-circuit protection, short-circuit protection, over-temperature protection, overvoltage protection and undervoltage protection, and a photoresistor RL connected with a dimming end of the CRM6123/5 type chip senses illumination change so as to adjust output current, so that the illumination stability of the navigation lamp is maintained.

Meanwhile, a first resistor R1 and a second resistor R2 are connected in series between a power supply end and the first filter circuit 2, the power supply end is connected with a third resistor R3, a dimming end is connected with a fourth resistor R4, the third resistor R3 and the fourth resistor R4 are in signal grounding through a second zener diode D5, a photoresistor RL connected with the dimming end is in signal grounding, a current sampling end is in signal grounding through a fifth resistor R5 and a sixth resistor R6 which are connected in parallel, a seventh resistor R7 is connected in series between the MOS gate drive end and an N-channel insulated gate field effect transistor and a seventh resistor R7 is in signal grounding through an eighth resistor R8, an auxiliary coil feedback end is in signal grounding through a ninth resistor R9, a tenth resistor R10 is connected between the auxiliary coil feedback end and a transformer T, a current limiting diode D6 and an eleventh resistor R11 are connected in series between the tenth resistor R10 and the power supply end, the transformer T is connected in parallel with a transformer filter resistor R20 and a transformer filter capacitor C11, a buffer diode D7 is connected in series between the transformation filter resistor R20 and the transformation filter capacitor C11 and the transformer T, the transformer T is connected in parallel with an ampere capacitor C12 with a signal grounded, a light emitting diode D1 on the singlechip 7 is grounded, and a twelfth resistor R12 is connected between the light emitting diode D1 and the singlechip 7. Each resistor in the LED driving circuit 3 plays a role in limiting current, and the parallel capacitor performs filtering and voltage stabilizing on the circuit.

Visibly, the light sources of the navigation light are distributed in a 120-degree equilateral triangle manner and are divided into an upper layer and a lower layer, and the photosensitive elements 11 are arranged on three corners in the middle of the upper light source and the lower light source and are respectively opposite to the upper layer, the lower layer and two adjacent light sources. The exit angle of the light source of the navigation light is 120 degrees so as to obtain the optimal illumination uniformity, the light source consists of six upper layers and six lower layers, the outer shell of the navigation light is made of copper or stainless steel, the lampshade is made of transparent PC material, and the LED lamp D8 is welded and fixed on the aluminum substrate.

In summary, the principle of the present embodiment is: the alternating current supplies power to the LED drive circuit 3 after passing through rectification and filtering, the LED drive circuit 3 adopts a primary side feedback LED drive chip 6 to keep output current stable, and further illumination stability is guaranteed, wherein the photosensitive element 11 connected with the single chip microcomputer 7 periodically detects a light source, and if illumination is attenuated to be lower than a preset minimum fault alarm threshold value, an alarm signal is sent.

The specific embodiments described herein are merely illustrative of the spirit of the utility model. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the utility model as defined in the appended claims.

Although the terms of the rectifying circuit 1, the photosensor 11, the first filter circuit 2, the LED driving circuit 3, the second filter circuit 4, the amplifying circuit 5, the primary side feedback LED driving chip 6, the single chip microcomputer 7, the position light switching circuit 8, the light source circuit 81, the reset circuit 82, the alarm detection circuit 9, the third filter circuit 91, and the fourth filter circuit 92 are used more frequently, the possibility of using other terms is not excluded. These terms are used merely to more conveniently describe and explain the nature of the present invention; they are to be construed as being without limitation to any additional limitations that may be imposed by the spirit of the present invention.

Claims

1. An LED navigation light control system comprises a rectifying circuit (1) connected with an alternating current circuit, wherein the rectifying circuit (1) is connected with an LED driving circuit (3) through a first filter circuit (2), the first filter circuit (2) and the LED driving circuit (3) are connected with a second filter circuit (4) through a transformer T, the second filter circuit (4) is connected with a power supply end through an amplifying circuit (5), the LED navigation light control system is characterized in that the LED driving circuit (3) adopts a primary side feedback LED driving chip (6), the dimming end of the primary side feedback LED driving chip (6) is connected with a photosensitive resistor RL, the photosensitive resistor RL is opposite to a light emitting diode D1 on a single chip microcomputer (7), the LED navigation light control system is connected with a navigation light switching circuit (8) and an alarm detection circuit (9), the single chip microcomputer (7) is connected with a time relay J1, alarm detection circuit (9) a plurality of detection relay J2 of being connected with singlechip (7) have, detection relay J2 through third filter circuit (91) ground connection, third filter circuit (91) including third filter resistor R13 and third filter capacitor C1 of parallel ground connection, the feed end pass through fourth filter circuit (92) ground connection, fourth filter circuit (92) fourth filter capacitor C2 that has a plurality of parallel ground connection protection, rectifier circuit (1) bridge rectifier BR with alternating current circuit connection has insurance F between bridge rectifier BR and the alternating current circuit, bridge rectifier BR adopt signal ground connection, bridge rectifier BR parallelly connected have thermistor RT and alternating current relay J3.

2. The LED navigation light control system according to claim 1, wherein the navigation light switching circuit (8) comprises a plurality of light source circuits (81) connected with the single chip microcomputer (7) in parallel, the light source circuits (81) are provided with current limiting resistors R14 and LED lights D8 which are connected in series, a key switch S is connected between the light source circuits (81) and the single chip microcomputer (7) in series, and a reset circuit (82) is connected between the key switch S and the single chip microcomputer (7).

3. The LED navigation light control system according to claim 2, wherein the reset circuit (82) comprises a first reset resistor R15 and a second reset resistor R16 connected between the key switch S and the single chip microcomputer (7) and connected in series with a reset pin of the single chip microcomputer (7).

4. The LED position light control system of claim 3, wherein the first R15 and the second R16 are connected to a power supply terminal and to ground through a first C3, and the key switch S is connected in parallel to a second C4.

5. The LED navigation light control system according to claim 1, wherein the first filter circuit (2) comprises an inductor L and a first filter resistor R17 which are arranged in parallel, a signal ground is carried out between the inductor L and the rectifying circuit (1) through a first polar electrolytic capacitor C5, and a signal ground is carried out between the inductor L and the LED driving circuit (3) through a first filter capacitor C6.

6. The LED navigation light control system according to claim 5, wherein the second filter circuit (4) comprises an output rectifier diode D2 and a second filter diode D3 connected between the transformer T and the amplifying circuit (5), a second polar electrolytic capacitor C7 for ground protection, a first current limiting resistor R18 and a second current limiting resistor R19 are connected in parallel between the output rectifier diode D2 and the transformer T, and a first voltage stabilizing diode D4 is connected in series with the second current limiting resistor R19.

7. The LED navigation light control system according to claim 6, wherein the amplifying circuit (5) comprises a ground-protected transistor Q, a ground-protected amplifying active-electrode capacitor C8 is connected between the transistor Q and the second filter circuit (4), and a ground-protected first voltage-stabilizing capacitor C9 and a ground-protected second voltage-stabilizing capacitor C10 are connected between the transistor Q and a power supply terminal.

8. The LED navigation light control system according to claim 1, wherein a primary side feedback LED driving chip (6) of the LED driving circuit (3) is CRM6123/5 in model, a power supply end of the primary side feedback LED driving chip (6) is connected with the first filter circuit (2), a power supply end of the primary side feedback LED driving chip (6) is connected with a dimming end, and a ground end of the primary side feedback LED driving chip (6) is in signal grounding.

9. The LED navigation light control system according to claim 8, wherein the current sampling end and the MOS gate driving end of the primary side feedback LED driving chip (6) are connected with a transformer T through an N-channel insulated gate field effect transistor, and the feedback end of the auxiliary coil of the primary side feedback LED driving chip (6) is connected with the transformer T and a power supply end.

10. The LED navigation light control system according to claim 9, wherein a first resistor R1 and a second resistor R2 are connected in series between the power supply terminal and the first filter circuit (2), the power supply terminal is connected with a third resistor R3, the dimming terminal is connected with a fourth resistor R4, the third resistor R3 and the fourth resistor R4 are signal grounded through a second zener diode D5, the photo resistor RL connected to the dimming terminal is signal grounded, the current sampling terminal is signal grounded through a fifth resistor R5 and a sixth resistor R6 which are connected in parallel, a seventh resistor R7 is connected in series between the MOS gate drive terminal and the N-channel IGBT, the seventh resistor R7 is signal grounded through an eighth resistor R8, the auxiliary coil feedback terminal is signal grounded through a ninth resistor R9, and a tenth resistor R10 is connected between the auxiliary coil feedback terminal and the transformer T, a current limiting diode D6 and an eleventh resistor R11 are connected in series between the tenth resistor R10 and a power supply end, the transformer T is connected with a voltage transformation filter resistor R20 and a voltage transformation filter capacitor C11 in parallel, a buffer diode D7 is connected in series between the voltage transformation filter resistor R20 and the voltage transformation filter capacitor C11 and the transformer T, the transformer T is connected with an ampere capacitor C12 with a signal grounded in parallel, and a light emitting diode D1 on the single chip microcomputer (7) is grounded and is connected with a twelfth resistor R12 between the single chip microcomputer (7).