CN216216577U

CN216216577U - Non-isolated switch power supply with high-power multi-mode control and multi-path high-voltage constant-current output

Info

Publication number: CN216216577U
Application number: CN202122677751.5U
Authority: CN
Inventors: 宣仲兴
Original assignee: Shanghai Yanjiang Intelligent Technology Co ltd
Current assignee: Shanghai Yanjiang Intelligent Technology Co ltd
Priority date: 2021-11-03
Filing date: 2021-11-03
Publication date: 2022-04-05
Anticipated expiration: 2031-11-03

Abstract

The utility model discloses a non-isolated switch power supply with high-power multi-mode control multi-path high-voltage constant current output, which relates to the field of switch power supplies and comprises a multi-path load end non-common ground output circuit, a multi-mode dimming conversion circuit, a flyback switch power supply circuit, an over-temperature protection circuit and a high-power double-booster circuit; the input end of the surge protection circuit is connected with alternating-current wide voltage, and the flyback switching power supply circuit is used for supplying power to the over-temperature protection circuit and the multi-mode dimming conversion circuit; the high-power double-booster circuit is used for boosting the alternating-current wide voltage to a set high voltage; the over-temperature protection circuit supplies power to the high-power double-booster circuit and the multi-path load end non-common ground output circuit when the temperature of the power panel is normal; the multi-mode dimming switching circuit outputs a PWM control signal for adjusting the power of a load, and the load end non-common ground output circuit outputs a constant current to drive the load to work. The switching power supply has the characteristics of broadband input, high output power, multiple control modes, high anti-interference capability and high safety.

Description

Non-isolated switch power supply with high-power multi-mode control and multi-path high-voltage constant-current output

Technical Field

The utility model relates to the field of switch power supplies, in particular to a non-isolated switch power supply with high power and multi-mode control of multi-path high-voltage constant-current output.

Background

In recent years, the lighting industry is generally characterized in that traditional lighting is developed to LED lighting, and LED lighting products related to the traditional lighting need an LED driving power supply with higher conversion efficiency, higher output power, more control modes, wider input voltage range, stronger interference resistance and higher reliability.

The AC/DC non-isolated switch power supply has the characteristics of high conversion efficiency, high power factor, small volume, low cost and the like. The existing non-isolation technology is a direct voltage reduction type low-power (< 60W) and medium-power (60W-600W) non-isolation switch power supply.

In the prior AC/DC non-isolated power supply technology, the input end and the load end are not electrically isolated by a transformer and are directly connected, the input end and the load end are grounded, and most of the power supplies are non-isolated direct step-down low-power supplies, namely, alternating current is rectified to obtain direct current high voltage, and then a Buck circuit is directly used for step-down and constant-current control. The direct current after rectification is also provided by a part of AC/DC medium-power non-isolated power supply, and is subjected to Boost and constant current control by a Boost circuit, and the direct current power supply has the characteristics of low cost, simplicity, poor anti-interference capability and low safety, is difficult to realize a wide input voltage range, is difficult to realize multi-path high-power (more than 1000W) output, and endangers a load once abnormality occurs, so that the load is burnt out due to overvoltage.

SUMMERY OF THE UTILITY MODEL

The utility model provides a non-isolated switch power supply with high power and multi-mode control of multi-channel high-voltage constant-current output aiming at the problems and the technical requirements, and the technical scheme of the utility model is as follows:

a high-power multimode control multi-channel high-voltage constant-current output non-isolated switch power supply comprises a multi-channel load end non-common ground output circuit, a multi-mode dimming conversion circuit, a flyback switch power supply circuit, an over-temperature protection circuit, a surge protection circuit, an EMC anti-interference circuit, a rectifier bridge stack and a high-power double booster circuit which are sequentially connected; the input end of the surge protection circuit is connected with alternating-current wide voltage, one output end of the EMC anti-interference circuit is connected with the input end of the flyback switching power supply circuit, the first output end of the flyback switching power supply circuit is connected with the power supply end of the over-temperature protection circuit to provide first direct-current voltage, and the second output end of the flyback switching power supply circuit is connected with the power supply end of the multi-mode dimming conversion circuit to provide second direct-current voltage; the high-power double-booster circuit is used for boosting the rectified alternating-current wide voltage to a set high voltage, and the output end of the high-power double-booster circuit is respectively connected with the input end of each load end non-common-ground output circuit; the output end of the over-temperature protection circuit is respectively connected with the high-power double booster circuit and the power supply end of the multi-path load end non-common ground output circuit, and supplies power to the power supply chip when the temperature of the non-isolated switch power supply board is normal; the multi-mode dimming conversion circuit comprises two dimming modes of external remote control and local manual control, the output end of the multi-mode dimming conversion circuit is respectively connected with the control end of each load end non-common ground output circuit, the multi-mode dimming conversion circuit outputs a PWM control signal with fixed frequency under the two dimming modes to adjust the power of the corresponding LED load, and the load end non-common ground output circuit outputs constant current to drive the corresponding LED load to work.

The high-power double-booster circuit comprises a main booster circuit and an auxiliary booster circuit which have the same circuit structure; the main booster circuit comprises a first power chip, a booster transformer, a first fly-wheel diode and a first MOS tube, wherein a primary coil port of the booster transformer is used as an input end of the high-power double booster circuit to be connected with rectified alternating-current wide voltage, a first end of a secondary coil of the booster transformer is connected with a zero current detection end of the first power chip, a second end of a secondary coil of the booster transformer is respectively connected with an anode of the first fly-wheel diode and a drain electrode of the first MOS tube, a power supply end of the first power chip is used as a power supply end of the high-power double booster circuit, a driving pulse output end of the first power chip is respectively connected with an anode of the first diode and a first end of the first capacitor, a cathode of the first diode is connected with a grid electrode of the first MOS tube, a second end of the first capacitor is grounded after passing through the first resistor, a second end of the first capacitor is also connected with an anode of the second diode, and a cathode of the second diode is connected with an input end of a comparator of the auxiliary booster circuit power chip, when the input end of the comparator of the auxiliary booster circuit has a detection signal, the cathode of the first fly-wheel diode of the main booster circuit and the cathode of the fly-wheel diode of the auxiliary booster circuit are jointly used as the output end of the high-power double booster circuit to output a set high voltage.

The flyback switching power supply circuit comprises a second power supply chip, a step-down transformer, two rectifier diodes, a second MOS tube, four filter capacitors and a plurality of resistors, wherein the anode of a third diode is used as the input end of the flyback switching power supply circuit to be connected with alternating-current wide voltage, the cathode of the third diode is grounded through the first filter capacitor, the cathode of the third diode is also connected with the input end of a multiplier of the second power supply chip sequentially through the three resistors and the second resistor, the series-connection ends of the three resistors and the second resistor are also respectively connected with the power supply end of the second power supply chip and the second filter capacitor, the driving pulse output end of the second power supply chip is connected with the cathode of a fourth diode through the third resistor, the anode of the fourth diode is connected with the grid electrode of the second MOS tube, and the drain electrode of the second MOS tube is sequentially connected with the two ends of a primary coil of the step-down transformer, the first end of a first secondary coil of the step-down transformer is connected with the anode of a first rectifier diode, the cathode of the first rectifier diode is grounded through a third filter capacitor, the connected end of the first rectifier diode is used as the first output end of the flyback switching power supply circuit to output first direct-current voltage, the first end of a second secondary coil of the step-down transformer is connected with the anode of a second rectifier diode, the cathode of the second rectifier diode is grounded through a fourth filter capacitor, and the connected end of the second rectifier diode is used as the second output end of the flyback switching power supply circuit to output second direct-current voltage.

The over-temperature protection circuit comprises a bipolar transistor, three triodes, a positive temperature coefficient heat sensor and a plurality of resistors; the common end of the emitting electrode of the bipolar transistor and the emitting electrode of the first triode are jointly used as the power supply end of the over-temperature protection circuit to receive a first direct current voltage, the positive temperature coefficient heat sensor is connected between the common end of the emitting electrode of the bipolar transistor and the first base electrode, the first collecting electrode of the bipolar transistor is connected with the base electrode of the second triode through a fourth resistor, the collecting electrode of the second triode is connected with the base electrode of a third triode, the collecting electrode of the third triode is connected with the base electrode of the first triode through a fifth resistor, the second collecting electrode of the bipolar transistor, the emitting electrodes of the second triode and the third triode are grounded, a sixth resistor is connected between the base electrode and the emitting electrode of the first triode, and the collecting electrode of the first triode is used as the output end of the over-temperature protection circuit after sequentially passing through the two series resistors, when the temperature of the power panel is normal, the power panel supplies power to the high-power double-booster circuit and the power chip of the multi-path load end non-common-ground output circuit.

The further technical scheme is that the load end non-common ground output circuit comprises a third power chip, a second fly-wheel diode, an output inductor, two MOS tubes and an output capacitor, wherein the anode of an LED load is respectively connected with the positive plate of the output capacitor, the first ends of three series resistors and the cathode of a second fly-wheel diode, the connected ends of the LED load are used as the input end of the load end non-common ground output circuit to receive set high voltage, the cathode of the LED load is respectively connected with the negative plate of the output capacitor, the second ends of the three series resistors and the first end of the output inductor, the anode of the second fly-wheel diode and the second end of the output inductor are connected with the drain electrode of a third MOS tube, the grid electrode of the third MOS tube is connected with the driving pulse output end of the third power chip, the source electrode of the third MOS tube is grounded through a seventh resistor, the input end of a multiplier of the third power chip is connected with the collector electrode of a fourth MOS tube, the base electrode of the fourth MOS tube is used as the control end of the load end non-common ground output circuit to receive PWM control signals, the PWM control signal acts on the third power supply chip to control the current of the load end non-common ground output circuit, and the comparator input end of the third power supply chip is used for detecting the sampling signal.

The multi-mode dimming conversion circuit comprises a digital-to-analog converter, an analog-to-digital converter, an operational amplifier, a voltage-stabilizing triode, a potentiometer and a switching jumper terminal; the first end of the switching jumper terminal is respectively connected with the inverting input end and the output end of the operational amplifier through an eighth resistor and is also grounded through a ninth resistor, the non-inverting input end of the operational amplifier is connected with the control end of a potentiometer, the first end of the potentiometer is connected with the power end of the operational amplifier, the output end of a voltage-stabilizing triode is connected with the power end of the operational amplifier, tenth to thirteenth resistors are connected in series, the first end of the tenth resistor, the input end of the voltage-stabilizing triode, the power supply end of a digital-to-analog converter and an analog-to-digital converter serve as the power supply end of the multi-mode dimming conversion circuit to receive second direct-current voltage, the thirteenth resistor and the second end of the potentiometer are grounded, and the potentiometer is used for generating 0-10V direct-current voltage; the second end of the switching jumper terminal is connected with the input end of the analog-to-digital converter, the output end of the analog-to-digital converter outputs a PWM control signal with fixed frequency, the PWM control signal is divided into shunts with the same number as that of the load end non-common ground output circuit, and each shunt is used as the output end of the multi-mode dimming conversion circuit; the third end of the switching jumper terminal is connected between the eleventh resistor and the twelfth resistor, the external module is connected with the input end of the digital-to-analog converter through the emitter follower, the output end of the digital-to-analog converter is connected between the tenth resistor and the eleventh resistor, and the external module comprises a power carrier control module, a DALI control module and a 0-10V control module and is used for generating PWM control signals with different frequencies; when the second end and the third end of switching jumper terminal short circuit, multi-mode dimming switching circuit is in external remote control, and when the first end and the second end short circuit of switching jumper terminal, multi-mode dimming switching circuit is in local manual control.

The further technical proposal is that the input alternating wide voltage range is AC200V-AC 500V; the power of each load end non-common ground output circuit is 500W, and the whole output power range is 0-2000W; the set high-voltage range of the output of the high-power double-booster circuit is 650V-700V.

The beneficial technical effects of the utility model are as follows:

the non-isolated switch power supply provided by the application not only keeps the advantages of the non-isolated switch power supply, but also improves the defects of the non-isolated switch power supply, has the characteristics of wide-band input alternating voltage range (AC200V-AC500V), high conversion efficiency (more than 96%), high output power (0-2000W), more control modes (including three types of external remote control and local manual control), high anti-interference capability and high safety (including open circuit protection, short circuit protection, over-temperature protection and non-common ground of an input end and a load end), meets the use requirements of future LED lighting lamps, is used as a driving power supply of an LED high-pole lamp, is popularized and applied to energy-saving and environment-friendly lighting products, and has remarkable economic and social benefits.

Drawings

Fig. 1 is an overall schematic diagram of a non-isolated switching power supply with high-power multi-mode control and multi-path high-voltage constant-current output provided by the application.

Fig. 2 is a circuit diagram of a high power dual boost circuit provided by the present application.

Fig. 3 is a circuit diagram of a flyback switching power supply circuit provided in the present application.

Fig. 4 is a circuit diagram of an over-temperature protection circuit provided in the present application.

Fig. 5 is a circuit diagram of a load side non-common ground output circuit provided by the present application.

Fig. 6 is a schematic diagram of a load terminal and an input terminal of a conventional non-isolated switching power supply being connected to the same ground.

Fig. 7 is a circuit diagram of a multi-mode dimming switching circuit provided in the present application.

Detailed Description

The following further describes the embodiments of the present invention with reference to the drawings.

As shown in fig. 1, the non-isolated switching power supply includes a four-way load end non-common ground output circuit, a multi-mode dimming conversion circuit, a flyback switching power supply circuit, an over-temperature protection circuit, and a surge protection circuit, an EMC anti-interference circuit, a bridge rectifier and a high-power dual-boost circuit connected in sequence.

An input alternating wide voltage (AC200V-AC500V) passes through a surge protection circuit consisting of fuses X012 and X013, piezoresistors R008, R009 and R017, ceramic gas discharge tubes R007 and R010 and a common mode inductor L003. The EMC anti-interference circuit is composed of capacitors C010-C014, C016, C018, C111, C112 and C124, common mode inductors L003, L010, L004 and L011, and inductors L001, L002, L005 and L006, wherein a connection end of the common mode inductor L011 and the capacitor C111 is used as one output end of the EMC anti-interference circuit to be connected with an input end L1 of the flyback switching power supply circuit, a first output end of the flyback switching power supply circuit is connected with a power supply end of the over-temperature protection circuit to provide a first direct current voltage +15V, and a second output end of the flyback switching power supply circuit is connected with a power supply end of the multi-mode dimming conversion circuit to provide a second direct current voltage + 12V. Meanwhile, the input alternating wide voltage (AC200V-AC500V) enters the high-power double-booster circuit after being rectified by the rectifier bridge stacks D020 and D021, the rectified alternating wide voltage is boosted to a set high voltage (650V-700V), and the high-power double-booster circuit is supplied to a four-path load end non-common ground output circuit to generate constant current for driving a corresponding LED load to work. The first direct current voltage +15V generates direct current voltage Vaux through an over-temperature protection circuit, and supplies power to a power supply chip of a high-power double-booster circuit and a multi-path load end non-common ground output circuit when the temperature of a non-isolation switch power supply board is normal. The multi-mode dimming conversion circuit comprises two dimming modes of external remote control and local manual control, the output end of the multi-mode dimming conversion circuit is respectively connected with the control end of each load end non-common ground output circuit, the multi-mode dimming conversion circuit outputs a PWM control signal with fixed frequency under the two dimming modes for adjusting the power of the corresponding LED load, and the working principle of each circuit is described in detail below.

Optionally, specific circuit structures of the surge protection circuit and the EMC anti-interference circuit are shown in fig. 1, and are not described herein again. The surge protection circuit is characterized in that according to the principle that discharge is main and blocking is auxiliary, a common mode protection is formed by the bidirectional fuse, the three piezoresistors and the ceramic gas discharge tube, a differential mode protection is formed by the piezoresistors and the ceramic gas discharge tube, a decoupling protection is formed by the common mode inductor, and a surge protection circuit of the power supply is formed by three-level protection.

As shown in fig. 2, the high-power dual voltage boost circuit includes a main voltage boost circuit and a sub voltage boost circuit with the same circuit structure, and the main voltage boost circuit includes a first power chip U1, a voltage boost transformer L300, a first freewheeling diode D301, a first MOS transistor T1, and output capacitors C313 and C314. An alternating wide voltage (AC200V-AC500V) is rectified and then input into an input end Vin of a high-power double-boosting circuit, the alternating wide voltage is boosted to 650V through a main boosting circuit and is supplied to an LED load of a load end non-common ground output circuit, if the LED load is increased, a signal of a driving pulse output end (7 pins) of a first power supply chip U1 rises, a first capacitor C1 is charged at the moment of rising edge, voltage drop is formed at two ends of a first resistor R1 and is supplied to an input end (4 pins) of a comparator of a power supply chip U301 of a secondary boosting circuit through a second diode D2 for detection, and when a detection signal is provided at the input end of the comparator of the secondary boosting circuit, a cathode of a first freewheeling diode D301 of the main boosting circuit and a cathode of a freewheeling diode D304 of the secondary boosting circuit are jointly used as an output end output of the high-power double-boosting circuit to set high voltage (650V-700V) and supply to the LED load end for working.

As shown in fig. 3, the flyback switching power supply circuit includes a second power chip U2, a step-down transformer L100, two rectifier diodes, a second MOS transistor T2, four filter capacitors, and a plurality of resistors. Alternating wide voltage (AC200V-AC500V) is subjected to half-wave rectification by a third diode D3 and is filtered by a first filter capacitor C101, one path of alternating wide voltage is subjected to voltage division and power taking by resistors R101, R102, R103 and R121, and is filtered by a second filter capacitor C109 to supply power to a second power supply chip U2, the second power supply chip U2 controls the switch of a second MOS transistor T2, the other path of alternating wide voltage enters a primary coil (7-9 pins) of a step-down transformer L100 to enable a secondary coil to generate induced electromotive force, and a first secondary coil (11-12 pins) is subjected to rectification by a first rectifier diode D105 and is filtered by a third filter capacitor C110 to output a first direct current voltage + 15V; the second secondary coil (pin 13-12) is rectified by a second rectifying diode D104 and filtered by a fourth filter capacitor C106, and then outputs a second direct current voltage + 12V.

As shown in fig. 4, the over-temperature protection circuit includes a bipolar transistor T204, three transistors, a ptc thermal sensor R212, and a plurality of resistors. The bipolar transistor T204, the second triode T203 and the PTC thermal sensor R212 form a differential comparator, and the first triode T200, the fifth resistor R5, the sixth resistor R6 and the two series resistors R201 and R202 form a common-base amplifying circuit. When the power panel works at a normal temperature, the resistance value of the positive temperature coefficient thermal sensor R212 is low, the base voltage of the second triode T203 is low and is in a cut-off state, the base voltage of the third triode T201 is high and is in a conducting state, the first triode T200 is conducted, and the collector outputs direct current voltage Vaux. When the temperature of the power board rises to 130 ℃, the resistance value of the positive temperature coefficient thermal sensor R212 is higher, the second triode T203 is conducted, the third triode T201 is cut off, the first triode T200 is cut off, and no output exists at the collector.

As shown in fig. 5, the load-side non-common-ground output circuit includes a third power chip U3, a second freewheeling diode D500, an output inductor L500, two MOS transistors, and an output capacitor C501. The third power chip U3 provides the voltage of the seventh resistor R7 at the source of the third MOS transistor T3 as a sampling signal to the input terminal (pin 4) of the comparator of the third power chip U3 to detect the sampling signal, controls the switch of the third MOS transistor T3 by the output terminal (pin 7) of the driving pulse, when the third MOS transistor T3 is turned on, the input set high voltage (650V-700V) is grounded through the LED load, the output inductor L500, the D-S pole of the third MOS transistor T3, and the seventh resistor R7, the LED load emits light, the voltage and current in the output inductor L500 rise, when the voltage and current rise to a certain value, the output terminal (pin 7) of the driving pulse controls the third MOS transistor T3 to turn off, the output inductor L500 reversely releases the voltage and current, and forms a loop with the LED load through the second freewheeling diode D500, so that the LED load continuously emits light. When the voltage and current in the output inductor L500 decrease to a certain value, the driving pulse output terminal (pin 7) controls the third MOS transistor T3 to be turned on again, and the process is repeated. The multiplier input end (pin 3) of the third power chip U3 is connected to the fourth MOS transistor T4, and the base of the fourth MOS transistor T4 is used as the control end of the load end non-common ground output circuit to receive the PWM control signal, so as to control the current of the output circuit and realize the output power adjustment of the power board.

Optionally, the non-isolated switching power supply of the present application may be distributed with four identical output circuits, where the power of the non-common ground output circuit at each load end is 500W, and the overall output power range is 0-2000W.

Comparing fig. 5 and fig. 6, in fig. 6, since the load is set in common with the input terminal, if +650V is directly applied to the LED load after the MOS transistor T100 is broken down, the load is likely to be burned out due to overvoltage. In fig. 5, since the load and the input terminal are not commonly connected, the LED load is grounded through the output inductor L500, the third MOS transistor T3 and the seventh resistor R7, and even if the third MOS transistor T3 is broken down, the seventh resistor R7 will burn open circuit for the first time, thereby protecting the LED load from being burned down.

As shown in fig. 7, the multimode dimming conversion circuit includes a digital-to-analog converter U400, an analog-to-digital converter U401, an operational amplifier U403, a voltage-stabilizing triode U405, a potentiometer RP001, and a transfer jumper terminal X400. The multi-mode dimming switching circuit switches the dimming mode to be external remote control or local manual control by switching the jumper terminal X400.

When the second end (pin 2) and the third end (pin 3) of the adapter jumper terminal X400 are short-circuited, the multi-mode dimming switching circuit is in external remote control and can be externally connected with a power carrier control module X001, a DALI control module X003 and a 0-10V control module X002, three different control modules generate PWM control signals with different frequencies, the PWM control signals are isolated and amplified by an emitter follower consisting of a resistor R400, a triode T400 and a resistor R401 and then are sent to an input end (pin 3) of a digital-to-analog converter U400, the converted 0-10V direct current voltage is output by an output end (pin 6) and sent to the input end (pin 3) of the analog-to-digital converter U401, the converted PWM control signals with fixed frequency are output by an output end (pin 7) and are divided into four paths which are respectively sent to the control ends of the load ends non-common-ground output circuits, and then are sent to the input end (pin 3) of a third power supply chip U3 after circuit amplification to control the output current and the load power of the output circuit, meeting the requirements of different applications.

When the first end (pin 1) and the second end (pin 2) of the changeover jumper terminal are in short circuit, the multi-mode dimming conversion circuit is under local manual control, a 0-10V adjustable voltage generator is formed by an operational amplifier U403, a voltage-stabilizing triode U405, a potentiometer RP001, an eighth resistor R8 and a ninth resistor R9, 0-10V direct-current voltage is generated by adjusting the potentiometer RP001 and is sent to an input end (pin 3) of an analog-to-digital converter U401, a converted PWM control signal with fixed frequency is output by an output end (pin 7) and is divided into four paths to be respectively sent to control ends PWM of non-common ground output circuits of load ends, and the four paths are sent to a multiplier (pin 3) of a multiplier (power amplifier) of a third power supply chip U3 after being amplified by the circuits to control output current and load power of the output circuits, so that requirements of different applications are met.

What has been described above is only a preferred embodiment of the present application, and the present invention is not limited to the above embodiment. It is to be understood that other modifications and variations directly derivable or suggested by those skilled in the art without departing from the spirit and concept of the present invention are to be considered as included within the scope of the present invention.

Claims

1. A high-power multimode control multi-channel high-voltage constant-current output non-isolated switch power supply is characterized in that the non-isolated switch power supply comprises a multi-channel load end non-common ground output circuit, a multi-mode dimming conversion circuit, a flyback switch power supply circuit, an over-temperature protection circuit, a surge protection circuit, an EMC anti-interference circuit, a rectifier bridge stack and a high-power double-booster circuit which are sequentially connected; the input end of the surge protection circuit is connected with alternating-current wide voltage, one output end of the EMC anti-interference circuit is connected with the input end of the flyback switching power supply circuit, the first output end of the flyback switching power supply circuit is connected with the power supply end of the over-temperature protection circuit to provide first direct-current voltage, and the second output end of the flyback switching power supply circuit is connected with the power supply end of the multi-mode dimming conversion circuit to provide second direct-current voltage; the high-power double-booster circuit is used for boosting the rectified alternating-current wide voltage to a set high voltage, and the output end of the high-power double-booster circuit is respectively connected with the input end of each load end non-common-ground output circuit; the output end of the over-temperature protection circuit is respectively connected with the high-power double booster circuit and the power supply end of the multi-path load end non-common ground output circuit, and supplies power to the power chip when the temperature of the non-isolation switch power supply plate is normal; the multi-mode dimming conversion circuit comprises two dimming modes of external remote control and local manual control, the output end of the multi-mode dimming conversion circuit is respectively connected with the control end of each load end non-common ground output circuit, the multi-mode dimming conversion circuit outputs a PWM control signal with fixed frequency for adjusting the power of the corresponding LED load in the two dimming modes, and the load end non-common ground output circuit outputs constant current to drive the corresponding LED load to work.

2. The non-isolated switching power supply with high-power multi-mode control and multi-path high-voltage constant-current output according to claim 1, wherein the high-power double-booster circuit comprises a main booster circuit and an auxiliary booster circuit which have the same circuit structure; the main booster circuit comprises a first power chip, a booster transformer, a first freewheeling diode and a first MOS (metal oxide semiconductor) tube, wherein a primary coil port of the booster transformer is used as an input end of the high-power double booster circuit to be connected with rectified alternating-current wide voltage, a first end of a secondary coil of the booster transformer is connected with a zero-current detection end of the first power chip, a second end of the secondary coil of the booster transformer is respectively connected with an anode of the first freewheeling diode and a drain electrode of the first MOS tube, a power supply end of the first power chip is used as a power supply end of the high-power double booster circuit, a driving pulse output end of the first power chip is respectively connected with an anode of the first diode and a first end of a first capacitor, a cathode of the first diode is connected with a gate of the first MOS tube, and a second end of the first capacitor is grounded after passing through a first resistor, and when the input end of the comparator of the auxiliary booster circuit has a detection signal, the cathode of the first freewheeling diode of the main booster circuit and the cathode of the freewheeling diode of the auxiliary booster circuit are jointly used as the output end of the high-power double booster circuit to output a set high voltage.

3. The non-isolated switching power supply with high-power multi-mode control and multi-path high-voltage constant-current output according to claim 1, wherein the flyback switching power supply circuit comprises a second power supply chip, a step-down transformer, two rectifier diodes, a second MOS (metal oxide semiconductor) transistor, four filter capacitors and a plurality of resistors, wherein the anode of a third diode is used as the input end of the flyback switching power supply circuit to be connected with an alternating-current wide voltage, the cathode of the third diode is grounded through a first filter capacitor, the cathode of the third diode is further connected with the input end of a multiplier of the second power supply chip through three resistors and a second resistor in sequence, the series-connection ends of the three resistors and the second resistor are further connected with the power supply end of the second power supply chip and the second filter capacitor respectively, the drive pulse output end of the second power supply chip is connected with the cathode of a fourth diode through a third resistor, the positive pole of fourth diode is connected the grid of second MOS pipe, the drain electrode of second MOS pipe connects gradually step down transformer's primary coil both ends, step down transformer's first secondary coil's first end is connected first rectifier diode's positive pole, first rectifier diode's negative pole passes through third filter capacitor ground connection, and links to each other the end and does first DC voltage is exported to flyback switching power supply circuit's first output, step down transformer's second secondary coil's first end is connected second rectifier diode's positive pole, second rectifier diode's negative pole passes through fourth filter capacitor ground connection, and links to each other the end and does flyback switching power supply circuit's second output exports second DC voltage.

4. The non-isolated switching power supply with high power and multi-mode control and multi-path high-voltage constant-current output according to claim 1, wherein the over-temperature protection circuit comprises a bipolar transistor, three triodes, a positive temperature coefficient heat sensor and a plurality of resistors; the common end of the emitting electrode of the bipolar transistor and the emitting electrode of the first triode are jointly used as the power supply end of the over-temperature protection circuit to receive the first direct-current voltage, the positive temperature coefficient heat sensor is connected between the common end of the emitting electrode of the bipolar transistor and the first base electrode, the first collecting electrode of the bipolar transistor is connected with the base electrode of the second triode through a fourth resistor, the collecting electrode of the second triode is connected with the base electrode of a third triode, the collecting electrode of the third triode is connected with the base electrode of the first triode through a fifth resistor, the second collecting electrode of the bipolar transistor, the emitting electrodes of the second triode and the third triode are grounded, a sixth resistor is connected between the base electrode and the emitting electrode of the first triode, and the collecting electrode of the first triode is used as the output end of the over-temperature protection circuit after being sequentially connected with two series resistors, and when the temperature of the power panel is normal, the power panel supplies power to the high-power double booster circuit and the power chip of the multi-path load end non-common ground output circuit.

5. The non-isolated switch power supply with high power and multimode control over multipath high-voltage constant-current output according to claim 1, wherein the load-side non-common-ground output circuit comprises a third power chip, a second freewheeling diode, an output inductor, two MOS transistors and an output capacitor, wherein an anode of the LED load is connected to a positive plate of the output capacitor, a first end of three series resistors and a cathode of the second freewheeling diode respectively, and a connection end of the LED load is used as an input end of the load-side non-common-ground output circuit to receive the set high voltage, a cathode of the LED load is connected to a negative plate of the output capacitor, a second end of the three series resistors and a first end of the output inductor respectively, an anode of the second freewheeling diode and a second end of the output inductor are connected to a drain of a third MOS transistor, and a gate of the third MOS transistor is connected to a driving pulse output end of the third power chip, the source electrode of the third MOS tube is grounded through a seventh resistor, the input end of a multiplier of the third power supply chip is connected with the collector electrode of a fourth MOS tube, the base electrode of the fourth MOS tube is used as the control end of the load end non-common-ground output circuit to receive the PWM control signal, the PWM control signal acts on the third power supply chip to control the current of the load end non-common-ground output circuit, and the input end of a comparator of the third power supply chip is used for detecting a sampling signal.

6. The non-isolated switching power supply with high power and multi-mode control and multi-path high-voltage constant current output according to claim 1, wherein the multi-mode dimming conversion circuit comprises a digital-to-analog converter, an analog-to-digital converter, an operational amplifier, a voltage-stabilizing triode, a potentiometer and a switching jumper terminal; the first end of the switching jumper terminal is respectively connected with the inverting input end and the output end of the operational amplifier through an eighth resistor and is also grounded through a ninth resistor, the non-inverting input end of the operational amplifier is connected with the control end of the potentiometer, the first end of the potentiometer is connected with the power end of the operational amplifier, the output end of the voltage-stabilizing triode is connected with the power end of the operational amplifier, the tenth resistor, the thirteenth resistor, the tenth resistor, the input end of the voltage-stabilizing triode, the digital-to-analog converter and the power supply end of the analog-to-digital converter are connected in series, the first end of the tenth resistor, the input end of the voltage-stabilizing triode, the power supply end of the digital-to-analog converter and the power supply end of the analog-to-digital converter serve as the power supply end of the multi-mode dimming conversion circuit to receive second direct-current voltage, the thirteenth resistor and the second end of the potentiometer are grounded, and the potentiometer is used for generating 0-10V direct-current voltage; the second end of the switching jumper terminal is connected with the input end of the analog-to-digital converter, the output end of the analog-to-digital converter outputs a PWM control signal with fixed frequency, the PWM control signal is divided into branches with the same number as that of the branches of the load end non-common ground output circuit, and each branch is used as the output end of the multi-mode dimming conversion circuit; the third end of the switching jumper terminal is connected between the eleventh resistor and the twelfth resistor, an external module is connected with the input end of the digital-to-analog converter through an emitter follower, the output end of the digital-to-analog converter is connected between the tenth resistor and the eleventh resistor, and the external module comprises a power carrier control module, a DALI control module and a 0-10V control module and is used for generating PWM control signals with different frequencies; when the second end and the third end of the transfer jumper terminal are in short circuit, the multi-mode dimming conversion circuit is in the external remote control, and when the first end and the second end of the transfer jumper terminal are in short circuit, the multi-mode dimming conversion circuit is in the local manual control.

7. The non-isolated switching power supply with high power and multi-mode control and multi-path high-voltage constant-current output according to any one of claims 1 to 6, wherein the input alternating wide voltage range is AC200V-AC 500V; the power of each load end non-common ground output circuit is 500W, and the whole output power range is 0-2000W; the set high-voltage range output by the high-power double-booster circuit is 650-700V.