CN206237303U - Meet the power module of onboard satellite anti-interference antenna power subsystem requirement - Google Patents

Abstract

The utility model discloses a kind of power module for meeting onboard satellite anti-interference antenna power subsystem requirement.The module includes shell, circuit board, input, output connector, and circuit board is sealed in shell, and input, output connector are separately fixed at the two ends of circuit board；Circuit and DC voltage converting circuit are set equipped with input overcurrent protection circuit, reverse connection prevention protection circuit, DC filtering circuit, spike voltage suppression circuit, overvoltage surge suppression and self-recovering type overvoltage crowbar, filtering storage circuit, under-voltage protection on circuit board；Shell and metal connector are shielded using sealed metal to wrap up wherein circuit board; ensure that it has good electromagnetic wave shielding; the index request of the power subsystem of the onboard satellite anti-interference antenna of Multiple Type can be met in electric property; defencive function is complete, with input and output mistake proofing plugging function；Ensure the accuracy and uniformity of power supply feature, can improve production efficiency, shortening R＆D cycle, reduction production and research fund.

Description

Meet the power module of onboard satellite anti-interference antenna power subsystem requirement

Technical field

The utility model is related to satellite anti-interference antenna electric power system, and more particularly to meet onboard satellite anti-interference for one kind The power module of antenna power unit requirement.

Background technology

The onboard satellite anti-interference antenna of Multiple Type was almost consistent in design principle in recent years, main including outer Shell structure, power subsystem, digital anti-interference process unit, radio frequency unit and antenna array element, primarily directed to different machines Type employs different form construction design and different software protocol conversions and related anti-interference indexs.For power supply list The technical indicator of unit applies almost identical specification requirement, it is necessary to power subsystem output direct current 5V voltages, stable state maximum load 10 watts or so of power consumption, meets the airborne DC power-supply system supplied character requirements of 28V in GJB181A-2003 and GJB181-1986, Index will including input undervoltage surge, input overvoltage surge, due to voltage spikes, voltage hit and wide scope DC input voitage etc. Ask, and meet the requirement of GJB151A-97 Electro Magnetic Compatibilities index of correlation, require as far as possible small in volume, conversion efficiency is tried one's best height. In product design before, for different product types, it is necessary to designer carries out locations of structures division, handle through consultation each The design of unit, it is necessary to carry out the position of power output interface with digital units and radio frequency unit for power subsystem Put correspondence, in addition it is also necessary to carry out position correspondence with the input interface of externally fed power supply, if lack effectively comprehensively linked up, hold very much The mistake of position is easily caused, causes line to intersect entanglement, influence overall design.And designer is needed according to actual need Fabric swatch again is carried out, development time and R＆D costs are increased, design careless mistake is easily produced in cumbersome fabric swatch work, made Into the waste in design.On the other hand, current power subsystem is designed by the way of bare board, big due to power subsystem Power and high-frequency characteristic, can influence the Electro Magnetic Compatibility index of whole machine, and more the unit of other inside anti-interference antenna can be produced Raw electromagnetic interference, causes the multinomial technical indicator of whole machine to decline, if mishandling, can influence the anti-interference energy of anti-interference antenna The receiving intensity of power and satellite-signal, further influences the location information of receiver and reduces positioning precision.

The content of the invention

In view of the deficiency that prior art is present, the utility model provides one kind and meets onboard satellite anti-interference antenna power supply list Meta design required standard power module.The direct current 5V voltages of power module output stabilization, peak power meets up to 15W 28V airborne DC power-supply system supplied characters requirement in GJB181A-2003 and GJB181-1986, can input undervoltage surge, The 5V of stabilization is kept to export in input overvoltage surge, due to voltage spikes, the airborne supplied character experiment of voltage hit, input voltage model It is 18~34V to enclose, and meets the index request of wide scope DC input voitage, and built-in EMI filter circuit can meet GJB151-97 The requirement of Electro Magnetic Compatibility index of correlation, small volume, length and width a height of 70 × 25 × 10（mm）, band carries conversion efficiency up to 88%, no Need extra heat abstractor.By four flange holes of module surrounding, it is fixed with whole machine.Input and output interface are used The J30J connectors of standard, two kinds of models with physics avoiding misinsertion, prevent input and output reversed.

The utility model to achieve the above object, is adopted the technical scheme that：One kind meets the anti-interference day of onboard satellite The power module of line power subsystem requirement, it is characterised in that：Including Metal shielding shell, input connector, circuit board and output Connector, circuit board is sealed in Metal shielding shell, and input connector and output connector are separately fixed at the two of circuit board End；Self-recovering type current foldback circuit A, reverse connection prevention protection circuit B, DC filtering circuit C, spike are housed on described circuit board Voltage absorpting circuit D, surge voltage absorb and overvoltage crowbar E, filtering storage circuit F, under-voltage protection set circuit G and straight Stream voltage conversion circuit H；Its circuit is connected as：Input connector is connected with reverse connection prevention protection circuit B, reverse connection prevention protection circuit B It is connected with self-recovering type current foldback circuit A, self-recovering type current foldback circuit A is connected with DC filtering circuit C, DC filtering Circuit C is connected with peak voltage absorbing circuit D, peak voltage absorbing circuit D and surge voltage absorb and overvoltage crowbar E companies Connect, surge voltage absorbs and overvoltage crowbar E is connected with filtering storage circuit F, filters storage circuit F and under-voltage protection setting Circuit G is connected, and under-voltage protection sets circuit G and is connected with DC voltage converting circuit H, and DC voltage converting circuit H connects with output Plug-in unit is connected.

The characteristics of the utility model is：Shell is shielded using sealed metal and be wrapped in for circuit board by metal connector Wherein, cover plate and box body junction, leave " deep gap " structure, it is ensured that it has good electromagnetic wave shielding, and by calking Heat Conduction Material, makes whole housing form large area and radiates, and product is had good thermal design, without increasing external cooling. The index request of the power subsystem of the onboard satellite anti-interference antenna of Multiple Type can be met in electric property, defencive function is neat Entirely.Input/output interface uses 9 pin bent-inserting-type J30J metal connectors, with metal shell good contact, forms intact electromagnetism Shielding, and with input and output mistake proofing plugging function.The power module combines the onboard satellite anti-interference antenna of Multiple Type Power subsystem design objective in one, alternative its power subsystem grinds in the batch production debugging of product and new product In system, the workload of commissioning staff and designer can be effectively reduced, it is ensured that the accuracy of power supply feature and consistent Property, can improve production efficiency, shorten the R＆D cycle, and reduce outlay of production and research fund.The utility model uses screw The mode of fixed connector is attached with outside input output, and installs fixation by the way of fastener fixation flange aperture, Welded without electric iron, convenient disassembly, with preferable convertibility.This power module is applicable to the machine of Multiple Type The power subsystem design requirement of satellite anti-interference antenna is carried, it is easy for installation, using simple, can be as versatility power module The satellite anti-interference antenna of various models carries out supporting, and scheduling and planning is carried out by full-time staff, it is ensured that the function of product it is good and Uniformity, the power module is applied by the power subsystem unification of anti-interference antenna, can to greatest extent reduce production and debugging warp Take.

Brief description of the drawings

Fig. 1 is outline drawing of the present utility model；

Fig. 2 is the explosive view of Fig. 1；

Fig. 3 is that circuit of the present utility model connects block diagram；

Fig. 4 is circuit theory diagrams of the present utility model.

Specific embodiment

Below in conjunction with accompanying drawing, the utility model is described in further detail：

As shown in Figure 1, Figure 2, Figure 3, Figure 4, the design includes Metal shielding shell, circuit board 3, is input into connector 4 and defeated Go out connector 5, circuit board 3 is sealed in Metal shielding shell, input connector 4 and output connector 5 respectively by screw and Nut is fixed on the two ends of circuit board 3；Equipped with self-recovering type current foldback circuit A, reverse connection prevention protection circuit B, straight on circuit board 3 Stream filter circuit C, peak voltage absorbing circuit D, surge voltage absorbs and overvoltage crowbar E, filtering storage circuit F, under-voltage Protection setting circuit G and DC voltage converting circuit H；Its circuit is connected as：Input connector 4 connects with reverse connection prevention protection circuit B Connect, reverse connection prevention protection circuit B is connected with self-recovering type current foldback circuit A, self-recovering type current foldback circuit A and DC filtering Circuit C connections, DC filtering circuit C are connected with peak voltage absorbing circuit D, peak voltage absorbing circuit D and surge voltage inhale Receive and overvoltage crowbar E connections, surge voltage absorb and overvoltage crowbar E is connected with filtering storage circuit F, filters electric power storage Circuit F sets circuit G and is connected with under-voltage protection, and under-voltage protection sets circuit G and is connected with DC voltage converting circuit H, direct current Voltage conversion circuit H is connected with output connector 5.

As shown in Fig. 2 the Metal shielding shell of the design includes housing 1 and cover plate 2, the two ends of circuit board 3 are respectively kept with Mounting hole for assembling connector, the bottom symmetrical of housing 1 is provided with four flanges 6 of integral type, will be respectively fixed at two ends with input The circuit board 3 of connector 4 and output connector 5 is fixed on housing 1, and cover plate 2 is integrated with the assembling of housing 1.

As shown in Figure 3 and Figure 4, input connector 4 uses J30J-9ZKWP7-J connector X1, output connector 5 to use J30J-9TJWP7-J connector X2, surge voltage absorbs and overvoltage crowbar E uses LTC4366-2 chip U1, DC voltage Change-over circuit H uses LMZ14203 chip U2, wherein, 1 pin and 2 pin of connector X1 connect Xiao by self-recovering type fuse F1 The positive pole of special based diode D1, the negative pole of Schottky diode D1 connects one end of inductance L1 and electric capacity C1, and electric capacity C1's is another End connects one end of inductance L2, while being connected to 3 pin and 4 pin of connector X1, is then grounded together；Inductance L1's and inductance L2 The other end connects electric capacity C2, while the other end of inductance L1 and inductance L2 connects two-way Transient Suppression Diode D2, two-way wink again One end that state suppresses diode D2 is connected to the drain electrode of metal-oxide-semiconductor M1, at the same further through resistance R1 be connected to chip U1 VDD pin and SD pin, the grid of metal-oxide-semiconductor M1 is connected to the GATE pin of chip U1 by resistance R5；One end of electric capacity C3 is connected to chip U1's TIM pin, the other end of electric capacity C3 is connected to the Vss pin and BASE pin of chip U1, and is grounded by resistance R2, while chip U1 BASE pin connect one end of resistance R3 and the OUT pin of chip U1 by electric capacity C4, and the other end of resistance R3 is connected to chip U1's FB pin, and be grounded by resistance R4；The OUT pin of chip U1 are connected to the source electrode of metal-oxide-semiconductor M1 again, and suppress two by two-way transient state Pole pipe D3, electric capacity C5 are grounded respectively, while the VIN pin of connection resistance R7, one end of resistance R8 and electric capacity C6 and chip U2, electricity again The other end for hindering R8 is connected to the RON pin of chip U2, and the other end of resistance R7 is connected to the EN of chip U2 with one end of resistance R6 Pin, while 5 pin and 6 pin of connector X1 are connected to again, the other end ground connection of resistance R6；The other end of electric capacity C6 and electric capacity C7's One end is connected to the GND pin of chip U2, and the other end of electric capacity C7 is connected to the SS pin of chip U2, one end of electric capacity C8 and resistance R9 The FB pin of chip U2 are connected to, while the one end with resistance R10 is connected again, the other end of resistance R9 is connected to the VOUT of chip U2 Pin, while the other end with electric capacity C8 is connected again, is then connected with one end of electric capacity C9 and electric capacity C10 again, after connection another 1 pin, 2 pin and 3 pin of connector X2 are connected to, the other end of resistance R10, electric capacity C9 and electric capacity C10 is connected to the 4 of connector X2 Pin, 5 pin and 6 pin, 7 pin of connector X2,8 pin and 9 pin are respectively connecting to 7 pin, 8 pin and 9 pin of connector X2.

The design physical installation：The design only has Metal shielding shell and metal connector in outside, and circuit board is in cavity Portion is fixed by screws on housing, and screw applies appropriate screw threads for fastening agent when installing, and cover plate leaves " deep seam with housing junction Gap " structure, it is ensured that capability of electromagnetic shielding；Meanwhile, larger element and heater members can increase appropriate thermal conductive silicon rubber on pcb board Glue, makes whole power module meet coupled vibration requirement, forms good Anti-vibration Design, heater members and shell on pcb board It is connected by heat conductivity gap filling material, whole housing is formed large area and radiate, reaches good thermal design.Input and output two Connector respectively from the matching fluting at housing two ends through, designed by the card slot type of housing and conductive rubber strip be installed, can Whole circuit board is sealed in metal shell and metal connector, makes whole circuit board that there is complete electromagnetic wave shielding.Outward Shell surrounding is provided with four ring flanges, power module can be carried out into installation fixation by four screw holes therein.In use only Need to plug the corresponding plug of connector by physics mode, and be input into output connector employ two kinds it is different Model, it is convenient to use with physics mistake proofing plugging function.

The design circuit operation principle：Input front end sets self-recovering type fuse F1 and Schottky diode D1, with reality Now it is input into the long-time increased newly in overcurrent protection function and GJB181B-2012 and is input into anti-reverse defencive function, it is ensured that is follow-up Storage circuit can be effectively applied to the load circuit of its rear end；And can in its back-end be parallel to the device between both positive and negative polarity When part occurs excessively stream or short trouble, prevent from causing electric power system expendable damage, again can be in excessively stream or short circuit During failure vanishes, normal operating conditions is automatically restored to.

DC filtering circuit configures suitable filter capacitor composition one-level DC filtering circuit using two inductance, to meet CE102 index requests specified in GJB151-97 Electro Magnetic Compatibilities, and coordinate completion other conducted emission class Electro Magnetic Compatibilities examination Requirement is tested, and the crest voltage and GJB181A- of the 600V due to voltage spikes that the airborne supplied characters of GJB181-1986 specify can be weakened The crest voltage of the 400V due to voltage spikes that 2003 airborne supplied characters specify, so that subsequent conditioning circuit preferably curbs peak voltage With the various voltage noises for transfiniting.

Peak voltage absorbing circuit uses 1500 watts of two-way Transient Suppression Diode, its shut-off voltage 85V, breakdown voltage 95V, clamps voltage 137V, and voltage clamp starts time 1ps, the due to voltage spikes that device after filtering weakens can be clamped into 137V, Peak voltage is thoroughly sponged by follow-up surge voltage absorbing circuit again.

Surge voltage is absorbed and overvoltage crowbar is used with the control core of the model LTC4366-2 of Linear Tech's production Piece is main body, and is aided with high-power MOS tube, two-way TVS pipe and peripheral capacitance resistance ware and completes the defencive function jointly.This chip is adopted With firm floating topological structure, with less volume and good stability, output clamp voltage and overvoltage protection are regularly The characteristics of utensil has outside adjustable, can need regulation clamp electrical voltage point and over-pressed duration according to design.

Related request for GJB181-1986 and GJB181A-2003 supplied characters, it is necessary to power module absorb 80V and The voltage surge of 50V.In this circuit design, clamp voltage is set as 36V, the over-pressed duration is set to 100ms.Chip The feed back input point FB of U1 is 1.23V to the voltage of OUT pins.

Resistance R3 as nominal resistance 12.4K is set, the pressure drop of 1.23V is distributed at its two ends, it is about to earth-current 0.1mA, the then voltage that resistance R4 two ends are distributed：

U=36V-1.23V=34.77V,

R4=U/I=34.77V/0.1mA≈348K。

This application sets the over-pressed duration by setting the capacitance of electric capacity C3, in GJB181-1986 supplied characters, The overvoltage surge duration is 50ms, it is contemplated that practical application and power MOS pipe bear overvoltage capabilities, therefore overvoltage is continued Time is defined to 100ms, when having served as the pressure duration more than setting value, you can caused by the analog control circuit inside chip U1 Export the gate off voltage of metal-oxide-semiconductor M1, so as to realize over-voltage protecting function.The charging current I of electric capacity C3 is according to chip U1 Set-point 9uA is calculated, and charging voltage upper limit U is 2.5V, after electric capacity C3 charges to be finished, you can realize above-mentioned functions.C3=I× T/U ≈ 360nF, therefore electric capacity C3 capacitances as the 330nF of standard are set, design requirement can be met.

Setting more than to resistance R3, resistance R4 and electric capacity C3, can be by overvoltage surge clamp in 36V, to reach suction The effect of overvoltage surge is received, when having served as the pressure duration more than 100ms, voltage output can be turned off, it is ensured that subsequent conditioning circuit safety is steady Fixed work.

The built-in cooling timers of 9 seconds of chip LTC4366-2, having served as the pressure duration has exceeded 100ms, have turned off electricity After pressure output 9 seconds, chip U1 will be performed and be retried operation automatically, after failure vanishes, can automatically recover normal voltage output, such as Over-voltage fault is still present, then continue to keep output shut-off, and self-recovering type over-voltage protecting function is achieved using the function.

During overvoltage surge, the pressure difference beyond clamp voltage is all born at N-channel MOS pipe M1 two ends, 600V voltages point Peak is shorter due to the duration, and power is smaller, so being provided with Transient Suppression Diode, Jiang Qifeng in surge absorbing circuit front end Threshold voltage is clamped in 137V, and the 80V surge voltage duration is more long, and power is larger, it is necessary to pass through metal-oxide-semiconductor source electrode and drain electrode completely Two ends are born, in products application, it is contemplated that the high reliability of product, therefore it is 200V to select pressure-resistant, and maximum current is 24A's Power MOS pipe, to ensure enough securities and durability, and selects the product of minimum volume to be laid out ensureing actual PCB Space.

There is the time delay of 1us in the reaction time of chip LTC4366-2, and peak voltage is absorbed in order to accomplish to be seamlessly connected, A two-way Transient Suppression Diode of clamp voltage 40V is provided with surge absorbing circuit end, two-way transient state suppresses two poles The startup time frame of pipe is 10^-12S, conventional instrument catches the due to voltage spikes less than so short time at all, therefore by this Set, the seamless connection that peak voltage signal can be reached substantially is absorbed, and follow-up voltage conversion circuit is protected to the full extent Do not influenceed by due to voltage spikes.

Filtering storage capacitor is mainly the requirement for tackling the 200us voltage hits proposed in some product requirements, according to public affairs Formula C=I × T/ Δ U, the operating current I=1A of product, hit duration T=200us, the minimum work electricity of voltage conversion circuit It is 7V to press,

Voltage variety Δ U=28-7=21V, calculates to obtain C=I × T/ Δ U ≈ 9.5uF.

Therefore pressure-resistant from 50V, the electric capacity of 22uF capacitances is used as the storage capacitor in this application.

It is the reference voltage and resistance R6, R7 couple provided by the Enable Pin EN pins of chip U2 that under-voltage protection sets circuit The intrinsic standoff ratio of input voltage is compared with completion.The Enable Pin of chip U2 provides accurate 1.18V band gap ascending threshold voltage.

According to computing formula R7/R6=(VinL/1.18) -1,

Setting under-voltage protection critical point VinL=7V, R6=13.8K,

Calculate to obtain R7=68.1K.

Set by this, when input voltage is less than 7V, can be exported with blanking voltage, prevent that input current is excessive to be caused to set Standby front end is damaged, it is possible to meets the demand of the under-voltage surges of 8V/50ms that GJB181-1986 specifies and coordinates completion 200us The index request of voltage hit, it is ensured that product can be worked during this abnormal electrical power with normal table.

The chip of the model LMZ14203 that DC voltage converting circuit is produced around TI companies completes circuit design, the electricity Road conversion efficiency is up to 90%, maximum output power consumption up to 18W, input voltage range 6 to 42V, output voltage range 0.8 to 6V, Built-in switch pipe, integrated protected type inductance, with very low electromagnetic interference (EMI) emissions, voltage output ripple as little as 10mV, relative to Other voltage conversion circuits have very strong advantage, therefore the circuit is applied in the design.Wherein electric capacity C6 is circuit The filter circuit of front end, the input voltage of stabilization is provided for subsequent conditioning circuit work；Chip U2（Model LMZ14203）It is power supply The main body chip of conversion, for other circuit parts provide input undervoltage protection reference signal, output voltage reference signal and soft open Dynamic time control signal, and be the core integrated circuit of the circuit with output short circuit protection function, it is voltage conversion circuit Core；The VIN pins of U2 are accessed by the power input after front-end protection processing of circuit, voltage conversion is proceeded by；Electricity Resistance R8 is that ON time sets resistance, and the RON pins of resistance R8 and chip U2 constitute ON time and set circuit, by changing R8 Resistance can adjust the length of ON time；The SS pins of electric capacity C7 and chip U2 constitute soft-start time and set circuit, lead to The SS pins for crossing chip U2 charge with realizing soft start function to electric capacity C7；The FB pin structures of resistance R9, resistance R10 and chip U1 Into output voltage setting circuit, output voltage values are set by adjusting the ratio size of resistance R9 and resistance R10, FB pins are carried The reference voltage of 0.8V is supplied, by calculating formula：VOUT=0.8 × (1+R9/R10), sets R10=6.8K Ω, output voltage VO U =5V, draws R9=35.7 K Ω, to meet 5V direct voltage outputs；Electric capacity C10 as circuit output end filter circuit, with core The VOUT pins connection of piece U2, the 5V direct-current working volts of stabilization are provided for follow-up load circuit.

Claims (3)

1. a kind of power module for meeting onboard satellite anti-interference antenna power subsystem requirement, it is characterised in that：Including metal screen Cover shell, circuit board（3）, input connector（4）And output connector（5）, circuit board（3）It is sealed in Metal shielding shell, Input connector（4）And output connector（5）It is separately fixed at circuit board（3）Two ends；Described circuit board（3）It is upper to be equipped with certainly Recovery formula current foldback circuit A, reverse connection prevention protection circuit B, DC filtering circuit C, peak voltage absorbing circuit D, surge voltage Absorb and overvoltage crowbar E, filtering storage circuit F, under-voltage protection setting circuit G and DC voltage converting circuit H；Its circuit It is connected as：Input connector（4）Be connected with reverse connection prevention protection circuit B, reverse connection prevention protection circuit B and self-recovering type overcurrent protection electricity Road A connections, self-recovering type current foldback circuit A are connected with DC filtering circuit C, DC filtering circuit C and peak voltage absorb Circuit D connections, peak voltage absorbing circuit D absorb with surge voltage and overvoltage crowbar E is connected, surge voltage absorbs and mistake Voltage protection circuit E be connected with filtering storage circuit F, filter storage circuit F and under-voltage protection setting circuit G is connected, under-voltage protection Set circuit G to be connected with DC voltage converting circuit H, DC voltage converting circuit H and output connector（5）Connection.

2. the power module for meeting onboard satellite anti-interference antenna power subsystem requirement according to claim 1, its feature It is：Described Metal shielding shell includes housing（1）And cover plate（2）, circuit board（3）Two ends be respectively kept with for assemble connect The mounting hole of plug-in unit, housing（1）Bottom symmetrical is provided with four flanges of integral type（6）, input will be respectively fixed at two ends with and patched Part（4）And output connector（5）Circuit board（3）It is fixed on housing（1）On, by cover plate（2）With housing（1）Assembling is integrated.

3. the power module for meeting onboard satellite anti-interference antenna power subsystem requirement according to claim 2, its feature It is：Described input connector（4）Using J30J-9ZKWP7-J connector X1, output connector（5）Using J30J- 9TJWP7-J connector X2, surge voltage absorbs and overvoltage crowbar E uses LTC4366-2 chip U1, DC voltage conversion Circuit H uses LMZ14203 chip U2, wherein, 1 pin and 2 pin of connector X1 connect Schottky by self-recovering type fuse F1 The positive pole of diode D1, the negative pole of Schottky diode D1 connects one end of inductance L1 and electric capacity C1, and the other end of electric capacity C1 connects One end of inductance L2 is connect, while being connected to 3 pin and 4 pin of connector X1, is then grounded together；Inductance L1's and inductance L2 is another End connection electric capacity C2, while the other end of inductance L1 and inductance L2 connects two-way Transient Suppression Diode D2, two-way transient state suppression again One end of diode D2 processed is connected to the drain electrode of metal-oxide-semiconductor M1, while being connected to the VDD pin and SD of chip U1 further through resistance R1 Pin, the grid of metal-oxide-semiconductor M1 is connected to the GATE pin of chip U1 by resistance R5；One end of electric capacity C3 is connected to the TIM of chip U1 Pin, the other end of electric capacity C3 is connected to the Vss pin and BASE pin of chip U1, and is grounded by resistance R2, while chip U1 BASE pin connect one end of resistance R3 and the OUT pin of chip U1 by electric capacity C4, and the other end of resistance R3 is connected to chip U1's FB pin, and be grounded by resistance R4；The OUT pin of chip U1 are connected to the source electrode of metal-oxide-semiconductor M1 again, and suppress two by two-way transient state Pole pipe D3, electric capacity C5 are grounded respectively, while the VIN pin of connection resistance R7, one end of resistance R8 and electric capacity C6 and chip U2, electricity again The other end for hindering R8 is connected to the RON pin of chip U2, and the other end of resistance R7 is connected to the EN of chip U2 with one end of resistance R6 Pin, while 5 pin and 6 pin of connector X1 are connected to again, the other end ground connection of resistance R6；The other end of electric capacity C6 and electric capacity C7's One end is connected to the GND pin of chip U2, and the other end of electric capacity C7 is connected to the SS pin of chip U2, one end of electric capacity C8 and resistance R9 The FB pin of chip U2 are connected to, while the one end with resistance R10 is connected again, the other end of resistance R9 is connected to the VOUT of chip U2 Pin, while the other end with electric capacity C8 is connected again, is then connected with one end of electric capacity C9 and electric capacity C10 again, after connection another 1 pin, 2 pin and 3 pin of connector X2 are connected to, the other end of resistance R10, electric capacity C9 and electric capacity C10 is connected to the 4 of connector X2 Pin, 5 pin and 6 pin, 7 pin of connector X1,8 pin and 9 pin are respectively connecting to 7 pin, 8 pin and 9 pin of connector X2.