CN110932555A

CN110932555A - Power supply direct current output method

Info

Publication number: CN110932555A
Application number: CN201911077538.1A
Authority: CN
Inventors: 李浔浔; 王钱磊; 赵传洲
Original assignee: QINGDAO AEROSPACE SEMICONDUCTOR RESEARCH INSTITUTE Co Ltd
Current assignee: QINGDAO AEROSPACE SEMICONDUCTOR RESEARCH INSTITUTE Co Ltd
Priority date: 2019-11-06
Filing date: 2019-11-06
Publication date: 2020-03-27

Abstract

The invention relates to a power supply direct current output method, which comprises the following steps; firstly, inputting a variable direct current voltage Vm, and inputting the variable direct current voltage Vm into a filtering unit to carry out common mode filtering twice; then, carrying out primary differential mode filtering; firstly, the filtered variable direct-current voltage Vm respectively supplies power to a main coil of a power supply power conversion unit and a PWM power supply unit; then, the PWM power supply unit supplies power to the power supply PWM controller; firstly, a power supply PWM controller generates square waves, and a primary coil of a power supply power conversion unit is controlled by a soft switch resonance unit to electrify or cut off a secondary coil; firstly, after the secondary level of the conversion unit receives energy, the energy is rectified and filtered by the voltage rectification and filtering unit to be converted into direct-current voltage; then, the voltage rectifying and filtering unit outputs a voltage sampling signal.

Description

Power supply direct current output method

Technical Field

The invention relates to a power supply direct current output method.

Background

With the development of science and technology, DC/DC power control systems have been widely used in the fields of computers, aerospace, instruments and meters, household appliances, and the like. With the increasing demand, the demand of DC/DC power sources is higher and higher, including volume, weight, efficiency, reliability and versatility. The output adjustable DC/DC power supply is provided, so that the versatility of the power supply is greatly improved. The adjustable rate of the output voltage of the adjustable DC/DC power supply on the market is about 10%, the adjustable range of the output voltage is narrow, the adjustable DC/DC power supply can be applied to occasions with great limitation and restriction, and meanwhile, the source effect and the load effect are about 1.0%, and the stability is poor. The output adjustable DC/DC power supply control system widens the voltage on the basis of a voltage stabilizing switch power supply, thereby realizing a power supply with adjustable output voltage. The output adjustable DC/DC power supply in the current market generally adopts the proportion of the divider resistance of the sampling circuit to realize the adjustment of the output voltage. The disadvantages are narrow adjustable voltage range and unstable output voltage. The method adopts a circuit topology structure of flyback soft switch resonance, greatly improves the adjustable range of the output adjustable DC/DC power supply, and simultaneously ensures the stability of the output voltage.

At present, arc rectifier modules produced by manufacturers at home and abroad are mostly packaged by plastic package shells, a radiator is required to be independently added, the temperature cycle resistance of the arc rectifier modules cannot meet the requirements of users and standards, and the problem of material expansion at high temperature and over temperature exists. The invention is designed to be a domestic first arc metal packaging rectifier module, a brand new arc metal shell is provided with radiating teeth, the encapsulation process is carried out, and a fixed cover plate is additionally arranged. The said structure has small size, good heat dissipation, light weight, wide temperature range of-55 deg.c to 125 deg.c and convenient installation and disassembly.

Most of IGBT-H bridge circuits produced by manufacturers at home and abroad are plastic-packaged, and have large volume and the size of about 107mm multiplied by 62mm multiplied by 31 mm; the bottom plate is made of red copper, so that the thermal expansion coefficient is large, and the application environment with severe temperature change is not facilitated. The IGBT-H bridge circuit with the current of 70A is designed, has a metal full-sealing structure and a small size of about 63mm multiplied by 57mm multiplied by 11 mm; the bottom plate is made of molybdenum copper, has small coefficient of thermal expansion, and can be applied to the environment with severe temperature change. The inverter is widely applied to an active inverter system, and can conveniently control loads such as an alternating current motor, a heater and the like.

Disclosure of Invention

The invention aims to solve the technical problem of providing a DC power supply control system and an output voltage control method. The adjustable range of the output voltage of the DC/DC power supply is 36V-72V, and the adjustable rate is 100%; the source effect and the load effect are both below 0.1%, and the output voltage is stable.

In order to solve the problems, the technical scheme adopted by the invention is as follows:

a DC power supply control system comprising a DC power supply; the DC power supply comprises an input filtering unit, a PWM power supply unit, a soft switch resonance unit, a power supply power conversion unit, a voltage rectification filtering unit, an adjustable voltage output unit, a PWM power supply unit, a power supply PWM controller, a power supply isolation feedback unit, a voltage division resistor unit and an external adjusting unit;

the input filtering unit comprises input common-mode inductors L2 and L3, input capacitors C16-C18, a TVS tube D3, an input differential-mode inductor L5 and input capacitors C31-33;

the input common-mode inductor L2 and the input capacitors C16-C17 form an input first-stage filter component; an input common mode inductor L3 and an input capacitor C18 form an input secondary filter component; an input differential mode inductor L5 and an input capacitor C31-33 form an input three-stage filtering component;

the TVS tube D3 is used for suppressing surge, one path of the direct current input signal Vm is grounded through the TVS tube D3, and the other path of the direct current input signal Vm is filtered and input after sequentially passing through the first-stage filtering component, the input second-stage filtering component and the input third-stage filtering component;

the power supply power conversion unit comprises a transformer TIC;

the PWM power supply unit comprises a current-limiting resistor R6, a triode Q2, diodes D5 and D7, a voltage regulator tube D6 and an external power supply Vcc;

the PWM power supply unit comprises a triode Q2; the filtered direct current input signal Vm is connected with a collector of a triode Q2, and the direct current input signal Vm is connected with a base of a triode Q2 through a current limiting resistor R6;

the power supply PWM controller comprises a control chip IC2 for controlling square wave signals and an amplifying integrated circuit IC 1;

the emitter of the triode Q2 is connected with a pin VIN and a pin Vcc of the control chip IC2 through a diode D7; an external power supply VCC is connected with a pin VIN and a pin Vcc of the control chip IC2 through a diode D5;

the pin out of the control chip IC2 is electrically connected with the pin INA of the amplifying integrated circuit IC1, and the pins outa and outb of the amplifying integrated circuit IC1 are electrically connected with the power control module;

the soft switch resonance unit comprises a first soft switch resonance module and a second soft switch resonance module which are connected in parallel and have the same structure;

the first soft switching resonance module comprises a driving resistor R13, a capacitor C34, a discharge resistor R14 and a soft switching MOS transistor Q3;

amplifying electric signals output by pins outa and outb of an integrated circuit IC1, wherein after the electric signals pass through a driving resistor R13 and a capacitor C34 which are connected in parallel, one output is connected with the S pole of a soft switch MOS tube Q3 through a discharge resistor R14, the other output is connected with the G pole of an MOS tube Q3, and the D pole of the MOS tube Q3 and a filtered direct current input signal Vm are connected with a main-stage coil of a transformer TIC;

the S poles of the soft switching MOS tube Q3 of the first soft switching resonance module and the soft switching MOS tube Q5 of the second soft switching resonance module are connected with a main coil of a mutual inductor T2; the secondary coil of the mutual inductor T2 is connected with the power conversion unit; the other end of the main coil of the mutual inductor T2 is grounded;

the power supply power conversion unit comprises parallel voltage limiting resistors R28-29, a current limiting resistor R27, a safety resistor R30 and a diode D9;

the safety resistor R30 is connected at two ends of a main coil of a transformer T2, one end of the main coil of the transformer T2 is divided into two paths through a diode D9, one path is grounded through a parallel voltage limiting resistor R28-29, and the other path is connected with a pin CS end of a control chip IC2 through a current limiting resistor R27;

the IC2 outputs square waves, when the circuit value fed back by the detection circuit is larger than the set threshold value of the control chip IC2, the MOS tube of the soft switch resonance unit is interrupted for protection, otherwise, the soft switch resonance unit is conducted, the TIC main coil of the transformer stores energy, and the TIC main coil is transferred to the TIC secondary coil of the transformer; the secondary coil of the transformer TIC generates current;

the voltage rectifying and filtering unit comprises at least two groups of parallel rectifying and filtering modules and two sections of sorting and filtering modules; the parallel rectification filtering module comprises a parallel rectification diode D1, parallel filtering capacitors C5-C8 and a parallel filtering common-mode inductor L1; the two-stage sorting filtering module comprises diodes C13 and C14 which are connected in parallel; an absorption capacitor C1 and an absorption resistor R1 which are connected in series are connected in parallel at two ends of the parallel rectifier diode D1;

after being combined, the output circuits of the parallel rectification filter modules output signals Vo of the adjustable voltage output unit through the two-stage finishing filter module; the structure of firstly connecting in parallel and then connecting in series is adopted, so that the voltage is reduced, and the feedback optocoupler is not easy to burn out;

the circuit of the divider resistor comprises an integrated circuit IC3 which is used as a reference voltage to ensure voltage stabilization, one pin of an integrated circuit IC3 is grounded with a reference resistor R25 through a reference capacitor C49 connected in parallel, the pin of the integrated circuit IC3 is connected with an external adjustable voltage output unit signal Vo through a resistor R8, the pin of the integrated circuit IC3 is connected with a collector of a triode Q4, the base of the triode Q4 is connected with the adjustable voltage output unit signal Vo through a resistor R10, and the emitter of the triode Q4 is connected with the adjustable voltage output unit signal Vo through a resistor R9; a capacitor C39 is connected between the base electrode and the collector electrode of the triode Q4; the output power load is controlled through the resistor R9-10, the capacitor C39 and the triode Q4, and the situation that the circuit cannot be started due to the fact that the input voltage is pulled down is avoided;

the external adjusting unit is connected with an external adjusting resistor between the Trim end and the voltage output unit signal Vo; the Trim end is connected to a collector of a triode Q4 through a resistor R21;

the power supply isolation feedback unit comprises a feedback optocoupler U1, an isolation triode Q1,

A light emitter of the feedback optocoupler U1 is connected with an emitting electrode of an isolation triode Q1 through a current-limiting resistor, a base electrode of an isolation triode Q1 is grounded through a voltage stabilizer D4, an output end of a parallel filtering common-mode inductor L1 of the parallel rectifying and filtering module is connected with a base electrode of an isolation triode Q1 through a resistor R5, and a resistor R4 is connected with a collector electrode of the isolation triode Q1; the feedback end of a light receiver of the feedback optocoupler U1 is grounded through a capacitor C37 and a resistor R19 which are connected in series; the feedback end of the light receiver of the feedback optocoupler U1 is electrically connected with the feedback pin COMP of the control chip IC2, so that the duty ratio of the control chip IC2 is adjusted.

A power supply direct current output method comprises the following steps;

firstly, inputting a variable direct current voltage Vm, and inputting the variable direct current voltage Vm into a filtering unit to carry out common mode filtering twice; then, carrying out primary differential mode filtering;

firstly, the filtered variable direct-current voltage Vm respectively supplies power to a main coil of a power supply power conversion unit and a PWM power supply unit; then, the PWM power supply unit supplies power to the power supply PWM controller;

firstly, a power supply PWM controller generates square waves, and a primary coil of a power supply power conversion unit is controlled by a soft switch resonance unit to electrify or cut off a secondary coil;

firstly, after the secondary level of the conversion unit receives energy, the energy is rectified and filtered by the voltage rectification and filtering unit to be converted into direct-current voltage; then, the voltage rectifying and filtering unit outputs a voltage sampling signal; and secondly, an error signal is generated by comparing an output voltage sampling signal of the power isolation feedback unit with a voltage reference source of the constant current source circuit, and the error signal controls the output pulse width of PWM (pulse width modulation) through optical coupler feedback, so that the voltage stabilization effect is realized.

The input of the power supply module is a variable direct-current voltage, the primary PWM control chip turns on and turns off the MOS tube, after the soft switch resonance, the energy is transmitted to the secondary side through the isolation of the flyback transformer, and then the direct-current voltage is changed into the direct-current voltage through rectification and filtering. The output voltage sampling signal is compared with a voltage reference source to generate an error signal, and the error signal controls the output pulse width of PWM through optical coupler feedback, so that the voltage stabilization effect is achieved. The output end of the module is connected with the slide rheostat, and the proportion of the divider resistor is adjusted by adjusting the resistance value of the slide rheostat, so that the output voltage is adjustable. By adopting a soft switch reverse resonance circuit, the response zero pole of the loop is changed. The output voltage can be adjusted in a wide range and still be stable.

The adjustable DC/DC power supply can greatly increase the adjustable voltage range, the adjustable rate of the adjustable DC/DC power supply is 10 times of that of the conventional power supply module, and the stability of the power supply module is improved.

The rectifier is designed by using a brand new metal arc-shaped shell, two products are matched to form a rectifier module, the interior of each product adopts a welding process and metal encapsulation, and the electrodes are positioned and fixed and the influence of colloid deformation at high temperature on the positions of the electrodes is inhibited by designing an internal insulating plate, the shape of the electrodes and an auxiliary fixing screw; the insulating cover plate is used at the top, so that the problems of micro expansion of the colloid at high temperature and serious expansion at over temperature are solved (even if the module is damaged by over temperature in the use process of a user, other devices of the user cannot be influenced by serious expansion of the colloid). The insulating plate is additionally arranged to fix the position of the electrode, and the colloid has the problems of micro expansion at high temperature and severe expansion at over-temperature. The shell temperature is easy to control by the user; the cooling fins do not need to be arranged independently (the use temperature can be increased by additionally arranging the radiator at high temperature); the use temperature range is expanded, and a large amount of installation space is saved for users; the problems of expansion of the internal epoxy resin and positional variation of the electrodes at high temperatures are suppressed by improving the structure.

The invention has the advantages of reasonable design, low cost, firmness, durability, safety, reliability, simple operation, time and labor saving, capital saving, compact structure and convenient use; the shell temperature is easy to control by the user; the cooling fins do not need to be arranged independently (the use temperature can be increased by additionally arranging the radiator at high temperature); the structure of the invention expands the range of the use temperature and saves a large amount of installation space for users; the problems of expansion of the internal epoxy resin and positional variation of the electrodes at high temperatures are suppressed by improving the structure.

According to the H-bridge module, an aluminum nitride DBC substrate is sintered on a shell bottom plate in a vacuum mode, and an IGBT chip and an FWD chip are sintered on the aluminum nitride DBC substrate in the vacuum mode; the aluminum nitride DBC substrate is electrically connected with the main electrode lead through a connecting bridge sintered in vacuum, and the aluminum nitride DBC substrate is electrically connected with the IGBT chip, the FWD chip and the auxiliary electrode lead through high-purity aluminum wires welded through ultrasonic pressure; the shell cover is buckled on the shell bottom plate.

The invention adopts a metal full-packaging shell, the chip adopts a vacuum sintering process, the insulation with the shell is realized through the aluminum nitride DBC substrate, and the temperature cycle resistance, the sealing property, the heat radiation performance and the like of the chip are ideal. The invention has small volume, light weight, large current, shock resistance, vibration resistance, good heat dissipation and higher cold and hot shock resistance. The inverter is suitable for inverting direct current under the environment with high voltage, high frequency and severe natural conditions; the shell cover and the shell are connected by adopting a parallel seam welding process, so that the shell cover can resist higher temperature impact.

IGBT-H bridge circuit: arranging an aluminum nitride DBC substrate on the shell bottom plate, and arranging an IGBT chip and an FWD chip on the aluminum nitride DBC substrate; the aluminum nitride DBC substrate is electrically connected with a main electrode lead through a connecting bridge which is sintered in vacuum, and the aluminum nitride DBC substrate is electrically connected with the IGBT chip, the FWD chip and the auxiliary electrode lead through high-purity aluminum wires; the shell cover is buckled on the shell bottom plate.

Drawings

Fig. 1 is a block diagram of an embodiment of a rectifier of the present invention. FIG. 2 is a block diagram of an H-bridge controller of the present invention. FIG. 3 is a block diagram of the H-bridge controller of the present invention. Fig. 4 is a block diagram schematic of the power supply of the present invention. Fig. 5 is a functional block diagram of the power supply of the present invention. Fig. 6 is a block diagram one of the power supply of the present invention. Fig. 7 is a block diagram two of the power supply of the present invention. Fig. 8 is a block diagram three of the power supply of the present invention. Fig. 9 is a block diagram four of the power supply of the present invention. Fig. 10 is a block diagram of the power supply of the present invention. Fig. 11 is a block diagram six of the power supply of the present invention. Fig. 12 is a block diagram seven of the power supply of the present invention. Fig. 13 is a block diagram eight of the power supply of the present invention. Fig. 14 is a schematic diagram of the diode hardware of the present invention. Fig. 15 is a schematic diagram of the diode circuit of the present invention. Wherein: 101. a diode substrate; 102. a diode terminal pin; 103. a diode wire insertion hole; 104. diode jackscrew; 105. diode positioning key slots; 106. an elastic conductive ring sheet of the diode; 107. a diode positioning key terminal; 108. an inner ring groove of the diode; 150. a rectifying outer shell; 151. a rectification insulation cover plate; 152. a rectifying electrode; 153. a rectification insulation clamping plate; 154. rectifying epoxy resin; (ii) a 155. An H-bridge circuit power component; 156. h bridge circuit casing.

Detailed Description

As shown in fig. 1 to 15, the DC power supply control system of the present embodiment, as shown in fig. 4 to 13, includes a DC power supply; the DC power supply comprises an input filtering unit, a PWM power supply unit, a soft switch resonance unit, a power supply power conversion unit, a voltage rectification filtering unit, an adjustable voltage output unit, a PWM power supply unit, a power supply PWM controller, a power supply isolation feedback unit, a voltage division resistor unit and an external adjusting unit;

the power supply power conversion unit comprises a transformer TIC;

The load-lifting constant current source circuit comprises an integrated circuit IC5, an optocoupler U2 and a comparator IC 4B; after being processed by the integrated circuit IC5, the load signal is output to the comparator IC4B, the comparator IC4B compares the input signal with a set threshold value, and the comparison result is output to the optocoupler U2; (ii) a And a feedback end of a light receiver of the optical coupler U2 is electrically connected with a feedback pin COMP of the control chip IC 2.

The power-on delay control circuit comprises field capacitors C46 and C47 which are connected in parallel, a Mos tube Q7, a triode Q6 and an external switch;

the G end of the Mos tube Q7 is connected with an external switch through a resistor R22, and the parallel field capacitors C46 and C47 are connected with the S end and the D end of the Mos tube Q7; the S end of the Mos tube Q7 is grounded, and the D end is externally connected with a power supply Vcc; the base electrode of the triode Q6 is electrically connected with the D end of the Mos tube Q7, the collector electrode of the triode Q6 is grounded, and the emitter electrode is connected with a feedback pin COMP of the control chip IC 2.

The rectifying diode includes an arc-shaped rectifying case 150, a rectifying insulating cover plate 151 disposed on the rectifying case 150, an electrical component disposed in the rectifying case 150, a rectifying electrode 152 disposed on the rectifying insulating cover plate 151 and electrically connected to the electrical component, a rectifying insulating chucking plate 153 disposed in the rectifying case 150 and fixing the rectifying electrode 152, and a rectifying epoxy resin 154 disposed between the rectifying insulating chucking plate 153 and the electrical component.

The external switch is a solid relay.

The DC power supply control system is electrically connected with a control circuit of alternating current, which includes an H-bridge circuit housing 156, and an H-bridge circuit power assembly 155 disposed in the H-bridge circuit housing 156; the H-bridge circuit power assembly 155 includes an aluminum nitride DBC substrate disposed on a bottom plate of the H-bridge circuit case 156, an IGBT chip and a FWD chip disposed on the aluminum nitride DBC substrate, and main electrode leads;

the aluminum nitride DBC substrate is electrically connected with the main electrode lead by adopting a connecting bridge sintered in vacuum, and the aluminum nitride DBC substrate is electrically connected with the IGBT chip, the FWD chip and the electrode lead by adopting aluminum wires; a housing cover is fastened to the H-bridge circuit housing 156.

The power supply direct current output method of the embodiment comprises the following steps;

In the third step, firstly, the power supply PWM controller turns on the soft switch resonance unit at a high level or turns off the soft switch resonance unit at a low level; and then, when the main coil of the power conversion unit is turned on, energy is stored, when the main coil of the power conversion unit is turned off, the main coil of the power conversion unit discharges, and after resonance of a soft switch, the energy of the power conversion unit is transmitted to a secondary coil in an isolated manner through a flyback transformer.

Step five, the output end of the power isolation feedback unit is connected with the slide rheostat as an external adjusting unit, and the proportion of the divider resistor is adjusted by adjusting the resistance value of the slide rheostat, so that the output voltage is adjustable; by adopting a soft switch reverse resonance circuit, the response zero pole of the loop is changed.

The output voltage can be adjusted in a wide range and still be stable.

As shown in fig. 14-15, the novel diode module of the present embodiment has better performance than the conventional diode structure, and includes a diode base 101, three diode terminal pins 102 disposed on the side of the diode base 101 for connecting to output and grounding, a diode wire insertion hole 103 vertically disposed on the diode terminal pins 102 for inserting a wire, a diode top wire 104 transversely disposed on the side of the diode wire insertion hole 103, a diode elastic conductive ring piece 106 disposed in the diode wire insertion hole 103, diode positioning key terminals 107 disposed at two ends of the diode elastic conductive ring piece 106, a diode positioning key slot 105, and a diode positioning key slot 105 disposed on the inner side wall of the diode wire insertion hole 103 and used for placing a corresponding diode positioning key terminal 107. Realize fixing a position the installation fast through the keyway structure, utilize the elastic principle of sheetmetal, compare in the tradition only through jackscrew crimping wire scheme, do not harm the wire, frictional force is big, and area of contact is big, simple to operate.

The diode base body 101 adopts a metal tube shell full-sealing structure, the power assembly is sintered on a metal tube shell of the diode base body 101, and a control part of the diode base body 101 is fixed above the power assembly through a PCB.

The diode elastic conductive ring piece 106 is arranged in an oval shape, the diode jackscrew 104 is positioned on the symmetrical center line of the diode positioning key slot 105, an external lead is installed in the center through hole of the diode elastic conductive ring piece 106, and the distance from the diode positioning key end 107 to the center point of the diode elastic conductive ring piece 106 is longer than the distance from the diode jackscrew 104 to the center point of the diode elastic conductive ring piece 106. The lead is inserted into the through hole of the elastic conductive ring sheet 106 of the diode, and then the top thread presses the ring sheet to make the ring sheet elastically deformed, so that the ring sheet is contacted and conducted with the lead.

And diode inner ring grooves 108 for increasing the contact friction force with the lead are distributed on the inner side wall of the diode elastic conductive ring sheet 106. The manufacturability is good, can have better frictional force and area of contact.

The power component in the diode body 101 comprises MOS tubes Q102-105 which are connected in parallel;

the S pole of the MOS tube Q102-105 connected in parallel is connected with an input terminal pin Vin, the D pole of the MOS tube Q102-105 connected in parallel is connected with an output terminal pin Vout, and a feedback circuit is connected between the G pole of the MOS tube Q102-105 connected in parallel and the terminal pin Vin;

the feedback circuit comprises resistors R101-R105, a feedback transformer T101, capacitors C101-104, a diode D102, a voltage regulator tube D101 and an amplifying triode Q101,

a divider resistor R102 and a capacitor C103 are connected in parallel between the base B of the amplifying triode Q101 and a terminal pin Vin, the base B of the amplifying triode Q101 is grounded GND through a voltage stabilizing resistor R104, the emitter E of the amplifying triode Q101 is grounded GND through a voltage stabilizing resistor R101, the capacitor C101 is connected between the base B of the amplifying triode Q101 and the emitter E, the capacitor C102 is connected between the emitter E of the amplifying triode Q101 and a collector C, and the terminal pin Vin is connected to the amplifying triode Q101 through a main coil of a feedback mutual inductor T101; one end of a secondary coil of the feedback transformer T101 is divided into two paths through a diode D102, one path is connected with an output terminal pin Vout through a capacitor C104, and the other path is connected with a current-limiting variable resistor R103;

the current-limiting variable resistor R103 is divided into two paths, one path is connected with the G pole of the MOS tube Q102-105 which are connected in parallel, and the other path is connected with the back-pressure resistor R105 and the voltage-stabilizing tube D101 which are connected in parallel and connected with the output terminal pin Vout;

the other end of the secondary coil is connected with an output terminal pin Vout;

the feedback time of the feedback circuit is adjusted through the resistance value adjustment of the back-pressure resistor R105.

The invention adopts the coil of the transformer as the mutual inductor to generate positive feedback vibration, start vibration, input and output to carry out transformer isolation, skillfully utilizes the reverse direction of the MOSFET to trigger and the body diode to completely realize the function of the diode, under the condition that the MOSFET is not triggered, the body diode realizes the function of the diode, the R105 can set the trigger time, the voltage division signal is amplified by the triode, oscillated, vibrated, filtered, limited in current, regulated in back pressure and triggered by the MOSFET, because the internal resistance of the MOSFET is lower, the power consumption can be greatly reduced, the voltage drop of the Schottky diode is more than 0.5V under the heavy current, and the voltage drop can be reduced to dozens of millivolts by adopting the function of the diode realized by the circuit, and when the voltage of the main circuit is reduced to a certain degree, the diode can also be.

The structural design adopts a brand-new metal full-sealing structure, the side surface of the metal full-sealing structure is provided with legs, the power assembly is sintered on the metal tube shell, and the control part is fixed above power by using a PCB (printed Circuit Board), so that the size is greatly reduced.

The invention designs a low-power consumption ideal diode with the current of 150A, triggers the MOSFET in reverse connection through ingenious design, greatly reduces the power consumption under the condition of completely realizing the function of the diode compared with the traditional diode, reduces the power consumption by one order of magnitude, does not need a radiator in a high-power occasion, still can reliably work, and greatly saves the weight and the volume. The metal full-sealed package can adapt to more severe applicable environment.

Claims

1. A power supply direct current output method is characterized by comprising the following steps;

2. The method of claim 1, wherein in step three, first, the power PWM controller turns on the soft switching resonant unit at high level or turns off the soft switching resonant unit at low level; and then, when the main coil of the power conversion unit is turned on, energy is stored, when the main coil of the power conversion unit is turned off, the main coil of the power conversion unit discharges, and after resonance of a soft switch, the energy of the power conversion unit is transmitted to a secondary coil in an isolated manner through a flyback transformer.

3. The power supply direct current output method according to claim 1, wherein step five, the output end of the power supply isolation feedback unit is connected with a slide rheostat as an external adjusting unit, and the proportion of the voltage dividing resistor is adjusted by adjusting the resistance value of the slide rheostat, so as to realize the adjustment of the output voltage; by adopting a soft switch reverse resonance circuit, the response zero pole of the loop is changed. The output voltage can be adjusted in a wide range and still be stable.

4. The power supply direct current output method according to claim 1, characterized by comprising the steps of supplying the DC power supply; the DC power supply comprises an input filtering unit, a PWM power supply unit, a soft switch resonance unit, a power supply power conversion unit, a voltage rectification filtering unit, an adjustable voltage output unit, a PWM power supply unit, a power supply PWM controller, a power supply isolation feedback unit, a voltage division resistor unit and an external adjusting unit;

the power supply power conversion unit comprises a transformer TIC;