CN219718541U

CN219718541U - LED constant voltage power supply with double-colored overcurrent pilot lamp function

Info

Publication number: CN219718541U
Application number: CN202320996183.1U
Authority: CN
Inventors: 羊红军; 严昌铭; 李祖创
Original assignee: Shenzhen Shenchuan Intelligent Co ltd
Current assignee: Shenzhen Shenchuan Intelligent Co ltd
Priority date: 2023-04-27
Filing date: 2023-04-27
Publication date: 2023-09-19
Anticipated expiration: 2033-04-27

Abstract

The utility model relates to an LED constant voltage power supply with a double-color overcurrent indicator lamp function, which comprises a shell with an opening at one end, wherein a fixed plate and an integrated circuit board are arranged in the shell, the integrated circuit board is arranged on the fixed plate, a power interface and an external terminal are arranged on the integrated circuit board, the power interface and the external terminal are arranged at the opening end of the shell, a power conversion circuit, a dimming circuit and a double-color overcurrent indicator circuit are also arranged on the integrated circuit board, the power conversion circuit is connected with the power interface, the dimming circuit and the double-color overcurrent indicator circuit are both connected with the power conversion circuit, the double-color overcurrent circuit is connected with the dimming circuit, and the dimming circuit is connected with the external terminal. The utility model discloses an LED constant voltage power supply with a double-color overcurrent indication lamp function, which has the double-color overcurrent indication function, is simpler in power supply installation, greatly reduces the failure rate of products, and can also ensure the current demand of a circuit during peak value.

Description

LED constant voltage power supply with double-colored overcurrent pilot lamp function

Technical Field

The utility model relates to the technical field of intelligent power supplies, in particular to an LED constant voltage power supply with a double-color overcurrent indicator lamp function.

Background

The intelligent constant voltage power supply in the current market only has the function of a power supply working indicator lamp and only outputs voltage prompt. And the overload protection of the power chip can be 110% -130% of rated power when the constant voltage power supply is designed. The installer does not have professional knowledge, and can continuously switch in the LED lamp load into the power supply, and the load is not switched in until overload protection, so that the power supply can work at the critical point of overload protection, and the power supply is used for a long time, so that the damage of the power supply or the overload protection triggering is easily caused, and a plurality of extra costs such as reworking are caused.

Therefore, it is necessary to provide an LED constant voltage power supply with a bi-color overcurrent indicator lamp function, so as to solve the above-mentioned problems.

Disclosure of Invention

The utility model aims to overcome the defects and the defects of the prior art, and provides an LED constant voltage power supply with a double-color overcurrent indication lamp function, which has the double-color overcurrent indication function, so that the power supply is simpler to install, the failure rate of a product is greatly reduced, the repair and repeated installation cost is saved, and the current demand of a circuit in a peak value can be ensured.

The aim of the utility model is realized by the following technical scheme:

the utility model provides a LED constant voltage power supply with double-colored overcurrent indicator function, includes one end open-ended casing, the inside fixed plate and the integrated circuit board of being provided with of casing, integrated circuit board block is fixed on the fixed plate, be provided with power source and external terminal on the integrated circuit board, just power source and external terminal set up in the open end of casing, the integrated circuit board still is provided with power conversion circuit, dimmer circuit and double-colored overcurrent indicator circuit, power conversion circuit with power source connection, dimmer circuit and double-colored overcurrent indicator circuit all with power conversion circuit connects, just the double-colored overcurrent circuit with dimmer circuit connects, dimmer circuit with external terminal connects.

As an optimized technical scheme, the power supply conversion circuit is provided with a lightning protection circuit, a rectifying and filtering circuit, a PFC boost circuit, a constant voltage circuit and a voltage stabilizing circuit which are sequentially connected, the lightning protection circuit is connected with a power supply interface, and the voltage stabilizing circuit is respectively connected with the dimming circuit and the double-color overcurrent indication circuit for supplying power.

As an optimized technical scheme of the utility model, the lightning protection circuit is provided with a zero line and a fire line, a fuse F1 is connected on the fire line, a piezoresistor MOV1 is connected between the zero line and the fire line in a bridging manner, the rear end of the piezoresistor MOV1 is connected with a common mode inductor LF1 and a common mode inductor LF3 in parallel, and an anti-interference capacitor CX1, a resistor R30 and a resistor R39 which are connected in series are connected between the common mode inductor LF1 and the common mode inductor LF3 in parallel.

As a preferred technical scheme of the present utility model, the rectifying and filtering circuit is provided with a rectifying bridge BD1, an inductor L2, a resistor R60, a capacitor CB1 and a capacitor CB3, the rectifying bridge BD1 is provided with four terminals a, b, c, d, terminals a and c of the rectifying bridge BD1 are communicated with the common-mode inductor LF3, the capacitor CB1 and the capacitor CB3 which are connected in parallel with each other are connected between terminals b and d of the rectifying bridge BD1, the inductor L2 is connected in series with the capacitor CB1, and the resistor R60 is connected in parallel with two ends of the inductor L2.

As a preferable technical scheme of the utility model, the PFC boost circuit is provided with a constant current control chip U1, a MOS tube Q4, an inductor T2, a boost diode D6 and a capacitor EC3, wherein the GATE end of the constant current control chip U1 is connected with the grid electrode of the MOS tube Q4, the inductor T2, the boost diode D6 and the capacitor EC3 are sequentially connected in series, one end of the inductor T2 is connected with the HV terminal of the constant current control chip U1, the drain electrode of the MOS tube Q4 is connected between the inductor T2 and the boost diode D6, one end of the capacitor EC3 is connected with the CS terminal of the constant current control chip U1, the source electrode of the MOS tube Q4 is grounded, and a plurality of sampling resistors are further connected to the CS terminal of the constant current control chip U1.

As a preferred technical scheme of the present utility model, the constant voltage circuit is provided with a switching power supply chip U2, a MOS transistor Q5, a transformer and an optocoupler U5, one end of a primary coil of the transformer is connected to a boost diode D6, the other end of the primary coil of the transformer is connected to a GATE G of the MOS transistor Q5, the GATE G of the MOS transistor Q5 is connected to a diode D4, the other end of the diode D4 is connected to a GATE end of the switching power supply chip U2, a source of the MOS transistor Q5 is connected to an inductor L1, the other end of the inductor L1 is grounded, one end of the optocoupler U5 is connected to a FB terminal of the switching power supply chip U2, the optocoupler U5 is connected to a SEL terminal of the switching power supply chip U2 and grounded, and both ends of the optocoupler U5 are connected in parallel to a capacitor C157.

As a preferred technical scheme of the utility model, the voltage stabilizing circuit is provided with a synchronous rectification chip D7 and a voltage stabilizing diode Q1, one end of the synchronous rectification chip D7 is connected with one end of a secondary coil of the transformer, two ends of the synchronous rectification chip D7 are connected with a capacitor C16 and a resistor R64 in parallel, two ends of the resistor R64 are connected with a resistor R65 in parallel, the other end of the synchronous rectification chip D7 is connected with the voltage stabilizing diode Q1, the other end of the voltage stabilizing diode Q1 is connected with the other end of the secondary coil of the transformer, two ends of the voltage stabilizing diode Q1 are connected with capacitors EC2 and EC4 in parallel, and the voltage stabilizing diode Q1 is connected with a resistor R24 in series and outputs 12V direct current voltage.

As a preferred technical scheme of the present utility model, the dimming circuit is provided with a terminal CON1, a triode Q3, a MOS transistor Q2, a zener diode D3, a chip resistor R17 and an LED terminal CON11, wherein the positive electrode of the LED terminal CON11 is connected to a 12V dc voltage, the terminal CON1 is connected to the external terminal, the VDD pin of the terminal CON1 is connected to the 12V dc voltage, the base of the triode Q3 is connected to the PWM1 and the PWM2 of the terminal CON1, the emitter of the triode Q3 is grounded, the collector of the triode Q3 is connected to the gate G of the MOS transistor Q2, the source S of the MOS transistor Q2 is connected to a resistor R36, the other end of the resistor R36 is grounded, the drain D of the MOS transistor Q2 is connected to the negative electrode of the LED terminal CON11, the zener diode D3 is connected to the chip resistor R17 in series, the MOD transistor Q2 is connected between the zener diode D3 and the resistor R17, and the chip resistor R17 is connected to one end of the chip resistor Q3.

As a preferable technical scheme of the utility model, the bicolor overcurrent indication circuit is provided with an amplifier U6-A, a comparator U6-B, a triode Q7, an LED1-A, a triode Q6 and an LED1-B, a No. 3 terminal of the amplifier U6-A is connected with a resistor R51, the other end of the resistor R51 is connected between the resistor R36 and the MOS transistor Q2, a resistor R57 and a capacitor C14 which are connected in parallel are connected between a No. 2 terminal and a No. 1 terminal of the amplifier U6-A, the other end of the resistor R57 is connected with a resistor R50, the other end of the resistor R50 is grounded, a No. 1 terminal of the amplifier U6-A is connected with a No. 4 terminal of the comparator U6-B, a No. 7 terminal of the comparator U6-B is connected with a resistor R66, the other ends of the resistor R66 are connected with bases of the triodes Q7 and Q6, emitters of the triodes Q7 and Q6 are respectively connected with resistors R56 and R55 and grounded, and the other ends of the triodes Q7 and Q6 are respectively connected with the collector electrodes of the triodes 3 and Q1-3 and Q35 and the LED1-B are respectively connected with the collector electrodes of the triodes 3 and the LED 1-3 and the triode 3 and the LED 1-B.

Compared with the prior art, the utility model has the following beneficial effects:

the utility model realizes flyback control of the constant voltage circuit by improving the constant voltage power supply circuit in the prior art, increases the overcurrent indication circuit, adopts the MOS tube source electrode serial alloy resistor to sample current, converts the current signal into the voltage signal, amplifies the voltage signal by the amplifying circuit, and compares the voltage signal with the differential voltage to output different levels, thereby leading the LED lamp to present different colors, and further telling a user whether the manual access load is overloaded or not, not only leading the power supply installation to be simpler, but also preventing the power supply from being burnt, ensuring the current requirement when the circuit peaks, greatly reducing the failure rate of products, saving the repair and repeated installation cost, and having high practicability.

Drawings

Fig. 1 is a schematic structural diagram of a power supply according to the present utility model.

Fig. 2 is a schematic diagram of a power conversion circuit according to the present utility model.

Fig. 3 is a schematic structural diagram of the lightning protection circuit of the present utility model.

Fig. 4 is a schematic structural diagram of the rectifying and filtering circuit of the present utility model.

Fig. 5 is a schematic diagram of a PFC boost circuit according to the present utility model.

Fig. 6 is a schematic diagram of the structure of the constant voltage circuit of the present utility model.

FIG. 7 is a schematic diagram of a voltage stabilizing circuit according to the present utility model.

Fig. 8 is a schematic diagram of a dimmer circuit according to the present utility model.

Fig. 9 is a schematic diagram of a dual-color overcurrent indication circuit according to the present utility model.

Detailed Description

The present utility model will be described in further detail with reference to examples and drawings, but embodiments of the present utility model are not limited thereto.

In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "provided," "connected," and the like are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this utility model belongs. The terminology used herein in the description of the utility model is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.

As shown in fig. 1, the implementation process of the present utility model is as follows: the utility model provides a LED constant voltage power supply with double-colored overcurrent indicator function, includes one end open-ended casing 1, and casing 1 has to set up to casing 11 and lower casing 12 joint structure, more convenient assembly to be provided with fixed plate 2 and integrated circuit board 3 in the inside of casing 1, fixed plate 2 fixes in casing 12 down, and integrated circuit board 3 block is fixed on fixed plate 2, still is provided with a plurality of draw-in grooves on fixed plate 2 simultaneously, be provided with power source 4 and a plurality of external terminal 5 on the integrated circuit board 3, fix power source 4 and external terminal 5 in the draw-in groove, and make the interface towards the open end of casing 1, more convenient wiring.

In addition, as shown in fig. 2, the integrated circuit board 3 is internally provided with a power conversion circuit, a dimming circuit and a dual-color overcurrent indication circuit, the power conversion circuit is connected with a power interface, electric energy can be provided for a power supply from the outside, the dimming circuit and the dual-color overcurrent indication circuit are connected with the power conversion circuit, the power conversion circuit can convert high voltage for other circuits, so that the operation requirement of an electric element is met, the dual-color overcurrent circuit is connected with the dimming circuit, the dimming circuit is connected with an external terminal, an external signal can be received through the dimming circuit, the signal is transmitted to the dual-color overcurrent indication circuit, whether the power supply is connected with a load or not is judged through comparison of input voltages, the power supply is simpler to install, the power supply can be prevented from being burnt, the current requirement during circuit peak value can be ensured, and the practicability is high.

The input end of the power supply can generate surge static electricity when being connected with an external power supply, a lightning protection circuit and a rectifying and filtering circuit are arranged at the front end of the power supply conversion circuit, the lightning protection circuit is connected with a power supply interface to ensure that the accessed voltage is stable, and the input voltage is converted through the PFC boost circuit, the constant voltage circuit and the voltage stabilizing circuit to output high-voltage direct current for the dimming circuit and the double-color overcurrent circuit.

As shown in fig. 3, the lightning protection circuit is provided with a zero line and a fire line, the fire line is connected with a fuse F1, personnel safety and equipment can be protected from damage when danger occurs, a piezoresistor MOV1 is bridged between the zero line and the fire line to form a differential mode suppression circuit, a common mode inductor LF1 and a common mode inductor LF3 are connected in parallel at the rear end of the piezoresistor MOV1, an anti-interference capacitor CX1 and a resistor R30 and a resistor R39 which are connected in series are connected in parallel between the common mode inductor LF1 and the common mode inductor LF3, and the anti-interference capability of the circuit is effectively improved by adopting differential mode and common mode full protection.

As shown in fig. 4, the rectifying and filtering circuit is provided with a rectifying bridge BD1, an inductor L2, a resistor R60, a capacitor CB1 and a capacitor CB3, the rectifying bridge uses full-bridge rectification to convert the input AC alternating current into DC direct current, the rectifying bridge BD1 is provided with four terminals a, b, c, d, the a terminal and the c terminal of the rectifying bridge BD1 are communicated with a common-mode inductor LF3, the b terminal and the d terminal are connected with the capacitor CB1 and the capacitor CB3 which are connected in parallel, as the inductor has small direct current impedance and large alternating current impedance, the inductor L2 is connected with the capacitor CB1 in series, the resistor R60 is connected with two ends of the inductor L2 in parallel, and the residual ripple voltage drops at two ends of the resistor to filter the alternating current component, thereby obtaining a smooth direct current voltage, and having better filtering effect.

As shown in fig. 5, the PFC BOOST circuit is provided with a constant current control chip U1, a MOS transistor Q4, an inductor T2, a BOOST diode D6 and a capacitor EC3, the GATE end of the constant current control chip U1 is connected to the GATE of the MOS transistor Q4, the inductor T2, the BOOST diode D6 and the capacitor EC3 are sequentially connected in series to form a BOOST driving circuit, one end of the inductor T2 is connected to the HV terminal of the constant current control chip U1, the drain electrode of the MOS transistor Q4 is connected between the inductor T2 and the BOOST diode D6, when the inductor T2 and the MOS transistor Q4 are conducted, energy is stored, when the MOS transistor Q4 is cut off, a right positive voltage, a left negative voltage is induced on the inductor T2, the energy stored during conduction charges a large filter capacitor through the diode D6, and high voltage energy is output; one end of the capacitor EC3 is connected with a CS terminal of the constant-current control chip U1, and the CS terminal of the constant-current control chip U1 is connected with a plurality of sampling resistors, such as resistors R9, R42, R40, R37 and the like, for collecting partial voltage of output voltage, and if the output is high, the input terminal can automatically reduce the voltage and reduce the output; if the output is low, the input end can automatically raise the voltage and improve the output, so that the constant current output is ensured, and the current requirement of the circuit during the peak value is met.

As shown in fig. 6, the constant voltage circuit is provided with a switching power supply chip U2, a MOS transistor Q5, a transformer and an optocoupler U5, wherein one end of a primary coil of the transformer is connected with a boost diode D6, the other end of the primary coil of the transformer is connected with a GATE G of the MOS transistor Q5, the GATE G of the MOS transistor Q5 is connected with a diode D4, the other end of the diode D4 is connected with a GATE end of the switching power supply chip U2, when the MOS transistor Q5 is turned on, a current flows through the primary coil of the transformer, the transformer stores energy in the form of a magnetic field, and since the primary coil and the secondary coil are different in phase, no current flows in the secondary coil when the current flows through the primary coil; when the switching tube is turned off, the vanishing magnetic field reverses the polarity of the voltage in the primary secondary coil, the diode D4 is turned on, the current flows to the load through the diode D4, the energy of the transformer is released, and the load voltage current is provided. The source electrode of the MOS tube Q5 is connected with an inductor L1, the other end of the inductor L1 is grounded, the output stability of the MOS tube Q5 can be improved, one end of the optical coupler U5 is connected with the FB terminal of the switching power supply chip U2, one end of the optical coupler U5 and the SEL terminal of the switching power supply chip U2 are grounded, two ends of the optical coupler U5 are connected with a capacitor C157 in parallel, an optocoupler is used for feedback, a controllable photoelectric switch is manufactured by using the optical coupler, and the photoelectric switch can play a very good role in controlling and stabilizing voltage for a switching circuit and a high-voltage circuit, and is simple and low in cost; and the CS end of the switching power supply chip U2 is also connected with a plurality of sampling resistors, and the partial voltage is collected and output so as to adjust the input voltage to control the output, thereby meeting the current requirement of the circuit.

As shown in fig. 7, the voltage stabilizing circuit is provided with a synchronous rectification chip D7 and a voltage stabilizing diode Q1, one end of the synchronous rectification chip D7 is connected with one end of a secondary coil of the transformer, the synchronous rectification chip D7 adopts DK5V100R10S, which is a simple and high-efficiency synchronous rectification chip, and a 100V power NMOS (n-channel metal oxide semiconductor) tube is integrated in the chip, so that the conduction loss of the diode can be greatly reduced, and the overall efficiency is improved; then, a capacitor C16 and a resistor R64 are connected in parallel at two ends of the synchronous rectification chip D7, and a resistor R65 is connected in parallel at two ends of the resistor R64, so that reverse peak voltage induced by the transformer can be absorbed, and the load of the diode can be reduced through a part of reverse current at high frequency; the other end of the synchronous rectification chip D7 is connected with a voltage stabilizing diode Q1, the other end of the voltage stabilizing diode Q1 is connected with the other end of the secondary coil of the transformer, two ends of the voltage stabilizing diode Q1 are connected with capacitors EC2 and EC4 in parallel, further filtering is carried out, and the rear end of the voltage stabilizing diode Q1 is connected with a resistor R24 in series and outputs 12V direct current voltage.

As shown in fig. 8, the dimming circuit is provided with a terminal CON1, a triode Q3, a MOS transistor Q2, a zener diode D3 and a chip resistor R17, and is also connected with an LED lamp, the anode of the LED is connected with a 12V dc voltage, the MOS transistor Q2 is connected with the cathode of the LED lamp, the terminal CON1 is connected with an external terminal, the VDD pin of the terminal CON1 is connected with a 12V dc voltage, the base of the triode Q3 is connected with PWM1 and PWM2 of the terminal CON1, the emitter of the triode Q3 is grounded, and the collector of the triode Q3 is connected with the gate G of the MOS transistor Q2, so that the triode Q3 can control the on-off of the MOS transistor Q2 through an externally connected signal, thereby realizing the dimming function of the LED lamp; and the voltage stabilizing diode D3 and the chip resistor R17 are connected in series, the base electrode of the MOS tube Q2 is connected between the voltage stabilizing diode Q3 and the chip resistor R17, one end of the chip resistor R17 is connected with the positive electrode of the LED lamp, one end of the voltage stabilizing diode Q3 is grounded, when no external control signal exists, the power supply circuit is not connected into a load, the MOS tube Q2 is kept in a normally-on state through the chip resistor R17 and the voltage stabilizing diode D3, and the state of the LED lamp is kept unchanged.

As shown in fig. 9, the bi-color overcurrent indication circuit is provided with an amplifier U6-a, a comparator U6-B, a triode Q7, an LED1-a, a triode Q6 and an LED1-B, wherein the terminal 3 of the amplifier U6-a is connected with a resistor R51, the other end of the resistor R51 is connected between a resistor R36 and the MOS transistor Q2, so that a voltage signal collected by the resistor in the dimming circuit can be input to the positive end of the amplifier U6-a through the resistor R51, a parallel resistor R57 and a capacitor C14 are connected between the terminals 2 and 1 of the amplifier U6-a, the other end of the resistor R57 is connected with a resistor R50, the other end of the resistor R50 is grounded, the formed amplifying circuit amplifies the original voltage signal, the amplified signal is connected to the comparator through the terminal 4 of the terminal 1 of the amplifier U6-a, the amplified signal is compared with the differential voltage of the terminal 5 of the comparator U6-B, and when the differential voltage of the pin 4 is larger than the differential voltage of the terminal 5, the LED is turned on by the triode Q7-7, and the LED is turned on; otherwise, the high level is output, the triode Q6 is conducted, the LED1-B blue lamp in the double-color LED lamp is lighted, and the function of switching the blue lamp and the red lamp can be realized under any current by adjusting the differential voltage of the 5 pins.

The foregoing examples merely illustrate embodiments of the utility model and are described in more detail and are not to be construed as limiting the scope of the utility model. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the utility model, which are all within the scope of the utility model. Accordingly, the scope of protection of the present utility model is to be determined by the appended claims.

Claims

1. The utility model provides a LED constant voltage power supply with double-colored overcurrent indicator function, its characterized in that, includes one end open-ended casing, the inside fixed plate and the integrated circuit board of being provided with of casing, integrated circuit board block is fixed on the fixed plate, be provided with power source and external terminal on the integrated circuit board, just power source and external terminal set up in the open end of casing, the integrated circuit board still is provided with power conversion circuit, dimmer circuit and double-colored overcurrent indicator circuit, power conversion circuit with power source connection, dimmer circuit and double-colored overcurrent indicator circuit all with power conversion circuit is connected, just the double-colored overcurrent circuit with dimmer circuit connects, dimmer circuit with external terminal connects.

2. The LED constant voltage power supply with the double-color overcurrent indicator lamp function according to claim 1, wherein the power supply conversion circuit is provided with a lightning protection circuit, a rectifying and filtering circuit, a PFC boost circuit, a constant voltage circuit and a voltage stabilizing circuit which are sequentially connected, the lightning protection circuit is connected with a power supply interface, and the voltage stabilizing circuit is respectively connected with the dimming circuit and the double-color overcurrent indicator circuit for supplying power.

3. The LED constant voltage power supply with the double-color overcurrent indicator lamp function according to claim 2, wherein the lightning protection circuit is provided with a zero line and a fire wire, a fuse F1 is connected to the fire wire, a piezoresistor MOV1 is connected between the zero line and the fire wire in a bridging mode, a common-mode inductor LF1 and a common-mode inductor LF3 are connected in parallel at the rear end of the piezoresistor MOV1, and an anti-interference capacitor CX1, a resistor R30 and a resistor R39 which are connected in series are connected in parallel between the common-mode inductor LF1 and the common-mode inductor LF 3.

4. The LED constant voltage power supply with the dual-color overcurrent indicator lamp function according to claim 3, wherein the rectifying and filtering circuit is provided with a rectifying bridge BD1, an inductor L2, a resistor R60, a capacitor CB1 and a capacitor CB3, the rectifying bridge BD1 is provided with four terminals a, b, c, d, a terminal a and c terminal of the rectifying bridge BD1 are communicated with the common-mode inductor LF3, a capacitor CB1 and a capacitor CB3 which are mutually connected in parallel are connected between a terminal b and a terminal d of the rectifying bridge BD1, the inductor L2 is connected in series with the capacitor CB1, and the resistor R60 is connected in parallel with two ends of the inductor L2.

5. The LED constant voltage power supply with the dual-color overcurrent indicator lamp function according to claim 2, wherein the PFC boost circuit is provided with a constant current control chip U1, a MOS transistor Q4, an inductor T2, a boost diode D6 and a capacitor EC3, a GATE end of the constant current control chip U1 is connected to a GATE of the MOS transistor Q4, the inductor T2, the boost diode D6 and the capacitor EC3 are sequentially connected in series, one end of the inductor T2 is connected to an HV terminal of the constant current control chip U1, a drain electrode of the MOS transistor Q4 is connected between the inductor T2 and the boost diode D6, one end of the capacitor EC3 is connected to a CS terminal of the constant current control chip U1, a source electrode of the MOS transistor Q4 is grounded, and a plurality of sampling resistors are further connected to the CS terminal of the constant current control chip U1.

6. The LED constant voltage power supply with the double-color overcurrent indicator lamp function according to claim 5, wherein the constant voltage circuit is provided with a switching power supply chip U2, a MOS tube Q5, a transformer and an optocoupler U5, one end of a primary coil of the transformer is connected with a boost diode D6, the other end of the primary coil of the transformer is connected with a grid G of the MOS tube Q5, the grid G of the MOS tube Q5 is connected with a diode D4, the other end of the diode D4 is connected with a GATE end of the switching power supply chip U2, a source electrode of the MOS tube Q5 is connected with an inductor L1, the other end of the inductor L1 is grounded, one end of the optocoupler U5 is connected with a FB terminal of the switching power supply chip U2, the optocoupler U5 is connected with a SEL terminal of the switching power supply chip U2 and is grounded, and two ends of the optocoupler U5 are connected with a capacitor C157 in parallel.

7. The LED constant voltage power supply with the double-color overcurrent indicator lamp function according to claim 6, wherein the voltage stabilizing circuit is provided with a synchronous rectification chip D7 and a voltage stabilizing diode Q1, one end of the synchronous rectification chip D7 is connected with one end of a secondary coil of the transformer, two ends of the synchronous rectification chip D7 are connected with a capacitor C16 and a resistor R64 in parallel, two ends of the resistor R64 are connected with a resistor R65 in parallel, the other end of the synchronous rectification chip D7 is connected with the voltage stabilizing diode Q1, the other end of the voltage stabilizing diode Q1 is connected with the other end of the secondary coil of the transformer, two ends of the voltage stabilizing diode Q1 are connected with capacitors EC2 and EC4 in parallel, and the voltage stabilizing diode Q1 is connected with a resistor R24 in series and outputs 12V direct current voltage.

8. The LED constant voltage power supply with the dual-color overcurrent indicator function according to claim 7, wherein the dimming circuit is provided with a terminal CON1, a triode Q3, a MOS transistor Q2, a zener diode D3, a chip resistor R17 and an LED terminal CON11, the positive electrode of the LED terminal CON11 is connected to a 12V dc voltage, the terminal CON1 is connected to the external terminal, the VDD pin of the terminal CON1 is connected to the 12V dc voltage, the base of the triode Q3 is connected to the PWM1 and PWM2 of the terminal CON1, the emitter of the triode Q3 is grounded, the collector of the triode Q3 is connected to the gate G of the MOS transistor Q2, the source S of the MOS transistor Q2 is connected to a resistor R36, the other end of the resistor R36 is grounded, the drain D of the MOS transistor Q2 is connected to the negative electrode of the LED terminal CON11, the diode D3 is connected to the chip resistor R17 in series, and the base of the MOD transistor Q2 is connected between the base of the diode Q3 and the chip resistor R17 and the one end of the chip resistor Q11 is grounded.

9. The LED constant voltage power supply with the double-color overcurrent indicator function according to claim 8, wherein the double-color overcurrent indicator circuit is provided with an amplifier U6-A, a comparator U6-B, a triode Q7, an LED1-A, a triode Q6 and an LED1-B, a terminal 3 of the amplifier U6-A is connected with a resistor R51, the other end of the resistor R51 is connected between the resistor R36 and the MOS transistor Q2, a parallel resistor R57 and a capacitor C14 are connected between terminals 2 and 1 of the amplifier U6-A, the other end of the resistor R57 is connected with a resistor R50, the other end of the resistor R50 is grounded, a terminal 1 of the amplifier U6-A is connected with a terminal 4 of the comparator U6-B, a terminal 7 of the comparator U6-B is connected with a resistor R66, the other end of the resistor R66 is connected with bases of the transistors Q7 and Q6, and the other ends of the triodes Q7 and Q6 are respectively connected with a resistor R55 and a collector electrode 35 to a collector electrode 35 of the resistor R6-B and the LED1-B is connected with a collector electrode 35.