CN103683982B - A kind of Buck structure stabilized voltage power supply of wide range AC voltage input - Google Patents
A kind of Buck structure stabilized voltage power supply of wide range AC voltage input Download PDFInfo
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- CN103683982B CN103683982B CN201410003378.7A CN201410003378A CN103683982B CN 103683982 B CN103683982 B CN 103683982B CN 201410003378 A CN201410003378 A CN 201410003378A CN 103683982 B CN103683982 B CN 103683982B
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Abstract
A kind of wide range AC voltage input Buck structure stabilized voltage power supply, relates to a kind of Buck structure stabilized voltage power supply.In order to solve the stabilized voltage power supply complex structure that there is wider input voltage range at present and the higher problem of cost.First this stabilized voltage power supply carries out rectification, by the voltage of DC/DC converter buck chopper control realization stable output to the alternating current that threephase alternator exports; Described rectification circuit adopts switchable topology, by rectification mode control circuit, and three phase half wave rectification when three-phase bridge rectification when realizing low pressure and high pressure; Also comprise and start power supply, drive circuit and current and voltage feedback control circuit: during starting, by start power supply be that described control circuit is powered, after rear class DC/DC converter normally works, excision starts power supply, and the voltage exported by DC/DC converter provides working power for described controller.It is applied to the occasions such as the wide range AC voltage of generator generation.
Description
Technical field
The present invention relates to a kind of Buck structure stabilized voltage power supply, belong to D.C. regulated power supply field.
Background technology
In recent years, switch power technology is day by day ripe, various Switching Power Supply stable performance, cheap, is widely applied in each field.But the Switching Power Supply input voltage range of existing structure is narrower, be difficult to be applied to the occasions such as the wide range AC voltage that generator produces.
The deficiencies in the prior art part is: have the stabilized voltage power supply complex structure of wider input voltage range and cost is higher.
Summary of the invention
The object of the invention is, in order to solve the stabilized voltage power supply complex structure that there is wider input voltage range at present and the higher problem of cost, to the invention provides a kind of wide range AC voltage input Buck structure stabilized voltage power supply.
A kind of wide range AC voltage input Buck structure stabilized voltage power supply of the present invention,
It comprises alternating current generator, rectified three-phase circuit, relay, diode D0, rectifying and wave-filtering electric capacity, busbar voltage testing circuit, DC/DC converter, current detection circuit, output filter capacitor, output voltage detecting circuit, rectification mode control circuit, starts power supply, drive circuit and current and voltage feedback control circuit;
The three-phase alternating current output of alternating current generator is connected with the three-phase alternating current input of rectified three-phase circuit;
One end of the DC output end positive pole of rectified three-phase circuit and one end of rectifying and wave-filtering electric capacity, busbar voltage testing circuit, the positive signal input of positive signal input and DC/DC converter starting power supply are connected simultaneously;
The DC output end negative pole of rectified three-phase circuit is connected with one end of the switch of relay, the anode of the other end of the switch of relay and the other end of rectifying and wave-filtering electric capacity, diode D0 and the other end of busbar voltage testing circuit, the negative signal input of negative signal input and DC/DC converter starting power supply are connected simultaneously, and the negative electrode of diode D0 is connected with the three-phase windings neutral point of threephase alternator;
The busbar voltage detection signal output of busbar voltage testing circuit is connected with the busbar voltage detection signal input of rectification mode control circuit, and the control signal output of rectification mode control circuit is connected with the control signal input of the switch of relay;
The positive signal output of DC/DC converter and one end of output filter capacitor, one end of output voltage detecting circuit and the output voltage signal input starting power supply are connected simultaneously;
The negative signal output of DC/DC converter and one end of current detection circuit connect the power supply ground of DC power supply Vc simultaneously;
The other end of current detection circuit is connected with the other end of output filter capacitor, the current detection signal input of current and voltage feedback control circuit (12) and the other end of output voltage detecting circuit simultaneously;
The voltage sense signal output of output voltage detecting circuit is connected with the voltage sense signal input of current and voltage feedback control circuit;
Start the voltage Vc output of power supply to be connected with the voltage Vc input of current and voltage feedback control circuit; Described DC/DC converter adopts Buck circuit of synchronous rectification topology.
The course of work of the present invention is: alternating current generator 1 exports three-phase alternating current, after rectified three-phase circuit 2 and rectifying and wave-filtering electric capacity 3, obtain direct voltage V
d; The direct voltage V detected according to busbar voltage testing circuit 4 by rectification mode control circuit 9
d, rectification mode control circuit 9 diverter switch K, realizes three-phase bridge full-wave rectification (K close) by rectified three-phase circuit 2 or in conjunction with diode D
0realize three phase half wave rectification (K disconnection); During startup, current and voltage feedback control circuit 12 and drive circuit 11 are powered by startup power supply 10, DC/DC converter 5 is started working, and by output voltage Vo for current and voltage feedback control circuit 12 provides power supply endlessly, thus current and voltage feedback control circuit 12 is powered by Vo separately.
The invention has the advantages that: the present invention adopts topological switchable rectification circuit, meets the requirement of AC-input voltage wide region; Adopt startup power supply, drive circuit and current and voltage feedback control circuit 12 to realize bootstrap power supply precharge, simplify accessory power supply design; DC/DC converter adopts Buck synchronous rectifier topology, and with MOSFET as switching device, provides the efficiency of system.
Accompanying drawing explanation
Fig. 1 is the principle schematic of a kind of wide range AC voltage input Buck structure stabilized voltage power supply described in embodiment one.
Fig. 2 is the circuit connection diagram of the rectified three-phase circuit described in embodiment two.
Fig. 3 is the circuit connection diagram of the rectification mode control circuit described in embodiment two.
Fig. 4 is the circuit connection diagram of the startup power supply described in embodiment three.
Fig. 5 is the circuit connection diagram of the DC/DC converter described in embodiment four.
The circuit connection diagram that Fig. 6 is the current and voltage feedback control circuit described in embodiment six and drive circuit and DC/DC converter.
Fig. 7 is the course of work principle schematic of a kind of wide range AC voltage input Buck structure stabilized voltage power supply of the present invention.
Embodiment
Embodiment one: composition graphs 1 illustrates present embodiment, a kind of wide range AC voltage input Buck structure stabilized voltage power supply described in present embodiment, it comprises threephase alternator 1, rectified three-phase circuit 2, relay, diode D0, rectifying and wave-filtering electric capacity 3, busbar voltage testing circuit 4, DC/DC converter 5, current detection circuit 6, output filter capacitor 7, output voltage detecting circuit 8, rectification mode control circuit 9, starts power supply 10, drive circuit 11 and current and voltage feedback control circuit 12;
The three-phase ac signal output of threephase alternator 1 is connected with the three-phase ac signal input of rectified three-phase circuit 2;
The positive source of the input side of the direct current output cathode of rectified three-phase circuit 2 and one end of one end of rectifying and wave-filtering electric capacity 3, busbar voltage testing circuit 4, the positive pole starting the input direct voltage of power supply 10 and DC/DC converter 5 is connected simultaneously;
The direct current output negative pole of rectified three-phase circuit 2 is connected with one end of the switch of relay, the other end of the switch of relay is connected with the anode of the other end of rectifying and wave-filtering electric capacity 3, diode D0 and the input side power cathode of the other end of busbar voltage testing circuit 4, the negative pole starting the input direct voltage of power supply 10 and DC/DC converter 5 simultaneously, and the negative electrode of diode D0 is connected with the neutral point of the three-phase windings handing over three-phase flow generator 1;
The busbar voltage detection signal output of busbar voltage testing circuit 4 is connected with the busbar voltage detection signal input of rectification mode control circuit 9, and the control signal output of rectification mode control circuit 9 is connected with the control signal input of relay;
The positive pole of DC/DC converter 5 outlet side and one end of one end of output filter capacitor 7, output voltage detecting circuit 8, the current detection signal input of current and voltage feedback control circuit 12 and the output voltage signal input starting power supply 10 are connected simultaneously;
The negative pole of DC/DC converter 5 outlet side and one end of current detection circuit 6 connect the power supply ground exporting DC power supply Vo simultaneously;
The other end of current detection circuit 6 is connected with the other end of the other end of output filter capacitor 7 and output voltage detecting circuit 8 simultaneously;
The voltage sense signal output of output voltage detecting circuit 8 is connected with the voltage sense signal input of current and voltage feedback control circuit 12;
Start the voltage Vc output of power supply 10 to be connected with the voltage Vc input of current and voltage feedback control circuit 12;
Described DC/DC converter 5 adopts Buck circuit of synchronous rectification topology.
The rectification of present embodiment has three-phase bridge full-wave rectification and three phase half wave rectification two kinds of working methods, depends on direct voltage V after rectification
dsize: when the three-phase alternating voltage that threephase alternator 1 sends is lower, the direct voltage V after rectification
dalso less, the coil no power of relay, normally-closed contact closes, and rectified three-phase circuit 2 is three-phase bridge topology; After the alternating voltage sent when threephase alternator 1 is elevated to certain value, the direct voltage V after rectification
dbe greater than the threshold value of setting, the coil of relay obtains electric, and normally-closed contact is opened, and rectified three-phase circuit 2 becomes three-phase half wave retifier topology.Relay is controlled by rectification mode control circuit 9, and the tolerance range of DC bus-bar voltage is considered in the selection of threshold value and stagnant endless belt width, and rectified three-phase circuit 2 topology can not cause V after switching
dbe less than threshold value again and relay is switched back and forth.
Direct voltage V after rectification
das the input of rear class DC/DC converter 5, realize the stable of step-down and output voltage by the DC/DC converter 5 of closed-loop control.For improving the whole efficiency of stabilized voltage power supply, DC/DC converter 5 adopts the Buck circuit of synchronous rectification topology of bipolarity working method.
During system electrification, first by starting power supply 10 from V
dupper power taking, service voltage current closed-loop control circuit 12; When current and voltage feedback control circuit 12 electric after, controls DC/DC converter 5 is started working, generation output voltage V
o; Then by V
ofor current and voltage feedback control circuit 12 is powered, reach self-sufficiency, and work as V
dwhen being greater than certain voltage, cutting off and start power circuit from V
dpower taking.
The voltage detecting circuit of present embodiment is all realized by electric resistance partial pressure mode, completes current detecting by major loop series connection sampling resistor.
Embodiment two: composition graphs 2 and Fig. 3 illustrate present embodiment, present embodiment is the further restriction to a kind of wide range AC voltage input Buck structure stabilized voltage power supply described in embodiment one;
Described rectification mode control circuit 9 comprises resistance R6 to R10, comparator and the first N-channel MOS pipe M1;
One end of resistance R6 is connected with one end of one end of resistance R7, resistance R10 and the forward signal input of comparator;
The source electrode of the other end of resistance R7, one end of resistance R9, the first N-channel MOS pipe M1 connects the power supply ground of DC power supply Vc simultaneously;
The other end of resistance R9 is connected with the non-inverting signal input thereof of comparator with one end of resistance R8 simultaneously, the while of the other end of the signal output part of comparator and resistance R10 and the grid of the first N-channel MOS pipe M1 be connected;
The other end of resistance R8 connects the positive pole of DC power supply Vc;
The other end of resistance R6 is the busbar voltage detection signal input of rectification mode control circuit (9).
The rectified three-phase circuit 2 of present embodiment adopts switchable topology diode rectifier circuit, as shown in Figure 2.Relay normally-closed contact K is sealed in the low end loop of bus, and by bus low side by diode D
0be connected with the three-phase windings neutral point of threephase alternator 1.
The voltage V that busbar voltage testing circuit 4 will detect
dbe input in rectification mode control circuit 9, the stagnant chain rate completing itself and setting threshold comparatively, compares the coil of output control relay.When generator just starts, alternating voltage is lower, V
ddo not exceed setting threshold, relay normally-closed contact is in closure state, and rectification circuit is by D
1~ D
6the three-phase bridge topology of composition, the alternating current that threephase alternator 1 sends obtains direct voltage V after three-phase bridge rectifier circuit and filter capacitor
d.Now V
dwith AC-input voltage V
inpass be:
V
d≈ 2.4V
in, V in formula
infor the ac phase voltage effective value that generator exports.
When threephase alternator 1 rotating speed promotes, the alternating voltage amplitude sent increases, direct voltage V after rectification
dbe greater than setting threshold, the normally-closed contact of the output signal control relay of rectification mode control circuit 9 disconnects, and rectified three-phase circuit 2 is switched to by 1D by bridge type topology
1the three-phase half wave retifier of ~ D3 and D0 composition, now V
dwith the pass of AC-input voltage be:
V
D≈1.2V
in
In rectification mode control circuit 9, threshold value and the comparator hysteresis band of setting should meet: do not reduce if topology switches rear alternating voltage, relay contact can not close again and make rectification circuit switch back bridge type topology, to avoid the frequent switching of relay contact.
Embodiment three: composition graphs 4 illustrates present embodiment, present embodiment is the further restriction to a kind of wide range AC voltage input Buck structure stabilized voltage power supply described in embodiment one;
Described startup power supply 10 comprises resistance R11 to resistance R18, N-channel MOS pipe M2, the 3rd N-channel MOS pipe M3, the 4th N-channel MOS pipe M4, voltage-stabiliser tube Z1 to voltage-stabiliser tube Z4, diode D7, diode D8 and electric capacity C3;
One end of resistance R11 is connected with one end of one end of resistance R14 and resistance R15 simultaneously;
The other end of resistance R11 is connected with the drain electrode of N-channel MOS pipe M2, and the grid of N-channel MOS pipe M2 is connected with the negative electrode of one end of resistance R12, voltage-stabiliser tube Z1 and one end of resistance R13 simultaneously;
The source electrode of N-channel MOS pipe M2 is connected with the anode of the other end of resistance R12, voltage-stabiliser tube Z1 and the anode of diode D7 simultaneously;
The drain electrode of the other end of resistance R13 and the negative electrode of the other end of resistance R14, voltage-stabiliser tube Z2, the drain electrode of the 3rd N-channel MOS pipe M3 and the 4th N-channel MOS pipe M4 is connected simultaneously;
The other end of resistance R15 is connected with the negative electrode of voltage-stabiliser tube Z3, and the anode of voltage-stabiliser tube Z3 is connected with one end of the 3rd N-channel MOS pipe M3 grid and resistance R16;
The grid of the 4th N-channel MOS pipe M4 is connected with one end of R17, and the other end of R17 is connected with the anode of one end of R18 and voltage-stabiliser tube Z4 simultaneously;
The source electrode of the source electrode of the negative electrode of voltage-stabiliser tube Z4, the other end of R18, the 4th N-channel MOS pipe M4, the other end of resistance R16, the 3rd N-channel MOS pipe M3, the anode of voltage-stabiliser tube Z2 and one end of electric capacity C3 connect the power supply ground of DC power supply Vc simultaneously;
The negative electrode of diode D7 is connected with the other end of the negative electrode of diode D8 and electric capacity C3 simultaneously;
One end of resistance R11 is the positive pole of the input direct voltage starting power supply (10), and the anode of voltage-stabiliser tube Z4 is output voltage signal input.
For current and voltage feedback control circuit 12, if current and voltage feedback control circuit 12 must not be electric when threephase alternator 1 starts, rear class DC/DC converter cannot work.As shown in Figure 4, the startup power supply of present embodiment powers first to current and voltage feedback control circuit 12, makes rear class DC/DC converter 5 work and produce output voltage V
o, and by V
ofeeding back to current and voltage feedback control circuit 12 makes whole system work together.The course of work starting power supply 10 is: DC bus-bar voltage V
dcause A point current potential to rise, make N-channel MOS pipe M2 conducting, V
dby little resistance current-limiting resistance R
11with diode D
7for electric capacity C
3charging, obtains DC power supply V
c; Output voltage V is produced after rear end DC/DC converter 5 works
o, exceed voltage-stabiliser tube Z
4nominal voltage make the 4th N-channel MOS pipe M4 conducting, A point current potential is dragged down, and N-channel MOS pipe M2 disconnects, and makes DC power supply V
cwith V
dcut off, to prevent V
dit is excessive and burn out current-limiting resistance R that overtension makes to flow through electric current
11; If current and voltage feedback control circuit 12 breaks down can not produce output voltage V
o, work as V
dbe greater than the voltage of voltage-stabiliser tube Z3, also drag down A point by making metal-oxide-semiconductor M3 conducting and make DC power supply V
cwith V
dcut off.Here the nominal voltage of voltage-stabiliser tube Z3 is greater than voltage-stabiliser tube Z
4nominal voltage, that is:
V
z3>V
z4, V in formula
z3and V
z4be respectively the nominal voltage of voltage-stabiliser tube Z3 and Z4.
Embodiment four: composition graphs 5 illustrates present embodiment, present embodiment is the further restriction to a kind of wide range AC voltage input Buck structure stabilized voltage power supply described in embodiment one, and described DC/DC converter 5 comprises a MOSFET power switch pipe T1, the 2nd MOSFET power switch pipe T2, inductance L and electric capacity C2;
The source electrode of the one MOSFET power switch pipe T1 is connected with the drain electrode of one end of inductance L and the 2nd MOSFET power switch pipe T2 simultaneously, and the source electrode of the 2nd MOSFET power switch pipe T2 is connected with one end of electric capacity C2;
The other end of inductance L is connected with the other end of electric capacity C2;
The drain electrode of the one MOSFET power switch pipe T1 is the input side positive source of DC/DC converter (5), and the source electrode of the 2nd MOSFET power switch pipe T2 is the input side power cathode for DC/DC converter (5).
For improving power-efficient, DC/DC converter adopts Buck synchronous rectification topology, and as shown in Figure 5, form bridge arm structure by two MOSFET power switch pipe T1 and T2, brachium pontis mid point is drawn and connected filter inductance L and electric capacity C2.DC/DC converter is input as busbar voltage V
d, export as V
o.
Embodiment five: composition graphs 6 illustrates present embodiment, present embodiment is the further restriction to a kind of wide range AC voltage input Buck structure stabilized voltage power supply described in embodiment four;
Described drive circuit 12 comprises chip I R2113, diode D9, electric capacity C4, resistance R19 and resistance R20;
The VB end of chip I R2113 is connected with the negative electrode of diode D9 and one end of electric capacity C4 simultaneously, the other end of electric capacity C4 is held with the VS of chip I R2113 and is connected, the HO end of chip I R2113 is connected with one end of resistance R19, the LO end of chip I R2113 is connected with one end of resistance R20, the other end of resistance R19 is connected with the grid of a MOSFET power switch pipe T1, and the other end of resistance R20 is connected with the grid of the 2nd MOSFET power switch pipe T2.
Embodiment six: composition graphs 6 illustrates present embodiment, present embodiment is the further restriction to a kind of wide range AC voltage input Buck structure stabilized voltage power supply described in embodiment five;
Current and voltage feedback control circuit 12 comprises driving chip and starts control circuit and chip UC3637;
Driving chip starts control circuit and comprises resistance R21 to resistance R26, N-channel MOS pipe M5, N-channel MOS pipe M6, N-channel MOS pipe M7 and voltage-stabiliser tube Z5;
One end of resistance R26 is connected with the negative electrode of voltage-stabiliser tube Z5, and the anode of voltage-stabiliser tube Z5 is connected with the grid of one end of resistance R25 and N-channel MOS pipe M7 simultaneously;
The drain electrode of N-channel MOS pipe M7 is connected with the grid of N-channel MOS pipe M6 and one end of resistance R21 simultaneously, and the other end of resistance R21 and one end of resistance R22, one end of resistance R23 and the anode of diode D9 connect the positive pole of DC power supply Vc simultaneously;
The other end of resistance R22 is connected with the grid of the drain electrode of N-channel MOS pipe M6 and one end of resistance R24 and N-channel MOS pipe M5 simultaneously;
The source electrode of the other end of resistance R25, the source electrode of N-channel MOS pipe M7, the source electrode of N-channel MOS pipe M6, the other end of resistance R24 and N-channel MOS pipe M5 connects the power supply ground of DC power supply Vc simultaneously;
The other end of resistance R23 and the drain electrode of N-channel MOS pipe M5 connect the SD end of chip UC3637 simultaneously;
The A of chip UC3637
oUThold and be connected with the HIN end of chip I R2113, the B of chip UC3637
oUThold and be connected with the LIN end of chip I R2113;
The other end of resistance R26 is the voltage signal inputs of current and voltage feedback control circuit 12.
The current and voltage feedback control circuit 12 of present embodiment adopts UC3637 to come as kernel control chip, and this device completes voltage and current two close cycles function by the design of its peripheral circuit.The sampled value of voltage and current feeds back in chip UC3637, is regulated the duty ratio adjusting two-way PWM by closed loop PI, is driven the break-make of the MOSFET power switch pipe of DC/DC converter 5 by chip I R2113, realizes Buck circuit chopper control and controls.Drive circuit 11 adopts IR2113 chip, and it can realize the two-tube driving of high low side.
Lower pipe driving power is by DC power supply V
cthere is provided, upper pipe driving power adopts bootstrap power supply, as shown in Figure 6.Because chip I R2113 needs could trigger its work for two-way low level signal to PWM input in work prerequisite, present embodiment adopts and realizes the control of PWM chip UC3637 Enable Pin SD.When powering on, first guarantee that N-channel MOS pipe M5 turns off, SD current potential is driven high to supply voltage, chip UC3637 is blocked, itself Aout and Bout holds and exports invalid low level switching signal, and two-way low level signal is input to HIN and the LIN pin of chip I R2113, and bootrom IR2113 works.After DC bus-bar voltage VD raises, exceed the voltage of voltage-stabiliser tube Z5, make N-channel MOS pipe M7 conducting, cause N-channel MOS pipe M5 conducting that SD is pulled to low level, chip UC3637 starts working.For ensureing that power supply normally works, requiring that said process completed before cut-out starts power supply, namely requiring V
z5<V
z4.
For ensureing that bootstrap power supply normally works, chip UC3637 output pwm signal maximum duty cycle being limited, making conducting to provide charge circuit for bootstrap power supply in each PWM cycle inner lower tube.Bootstrap power supply charging process is: when the 2nd MOSFET power switch pipe T2 conducting, and DC power supply VC, diode D9, electric capacity C4 and the 2nd MOSFET power switch pipe T2 form charging closed loop, and power supply VC charges to electric capacity C4; When the 2nd MOSFET power switch pipe T2 turns off, electric capacity C4 lower end isolates with ground, and on electric capacity C4, electric charge is that VB powers, and ensures the work of tube drive circuit on chip I R2113.
Fig. 7 is course of work principle schematic of the present invention.Threephase alternator 1 starts, and the alternating current sent is input in rectified three-phase circuit 2, and because relay normally-closed contact closes, rectified three-phase circuit 2 is three-phase bridge structure; Rectification direct current V out
dstartup power supply 10 is started working, DC power supply V is provided
c; V
ddo not reach the voltage making voltage-stabiliser tube Z5 conducting, SD is driven high V
c, thus forbid that chip UC3637 work makes the work of the enable chip I R2113 of its output low level pwm signal; Along with the rising of threephase alternator 1 voltage, work as V
d>V
z5after, voltage-stabiliser tube Z5 conducting, make N-channel MOS pipe M7 conducting, N-channel MOS pipe M6 turns off, N-channel MOS pipe M5 conducting and drag down SD current potential, chip UC3637 normally works; The normal work of control circuit, makes rear class DC/DC converter 5 output voltage V
o, V
o>V
z4time, make the 4th N-channel MOS pipe M4 conducting, drag down A point current potential and make N-channel MOS pipe M2 turn off cut-out startup power supply; As busbar voltage V
dcontinue to rise, after exceeding certain threshold value, relay K contact is opened, and rectification circuit is switched to three phase half wave rectification topology.
Claims (5)
1. a Buck structure stabilized voltage power supply for wide range AC voltage input, it comprises threephase alternator (1), rectified three-phase circuit (2), relay, diode D0, rectifying and wave-filtering electric capacity (3), busbar voltage testing circuit (4), DC/DC converter (5), current detection circuit (6), output filter capacitor (7), output voltage detecting circuit (8), rectification mode control circuit (9), starts power supply (10), drive circuit (11) and current and voltage feedback control circuit (12);
The three-phase alternating current output of threephase alternator (1) is connected with the three-phase alternating current input of rectified three-phase circuit (2);
The positive source of the input side of the direct current output cathode of rectified three-phase circuit (2) and one end of one end of rectifying and wave-filtering electric capacity (3), busbar voltage testing circuit (4), the positive pole starting the input direct voltage of power supply (10) and DC/DC converter (5) is connected simultaneously;
The direct current output negative pole of rectified three-phase circuit (2) is connected with one end of the switch of relay, the other end of the switch of relay is connected with the anode of the other end of rectifying and wave-filtering electric capacity (3), diode D0 and the input side power cathode of the other end of busbar voltage testing circuit (4), the negative pole starting the input direct voltage of power supply (10) and DC/DC converter (5) simultaneously, and the negative electrode of diode D0 is connected with the neutral point of the three-phase windings of threephase alternator (1);
The busbar voltage detection signal output of busbar voltage testing circuit (4) is connected with the busbar voltage detection signal input of rectification mode control circuit (9), and the control signal output of rectification mode control circuit (9) is connected with the control signal input of relay;
The positive pole of DC/DC converter (5) outlet side is connected with the output voltage signal input starting power supply (10) with one end of one end of output filter capacitor (7), output voltage detecting circuit (8) simultaneously;
The negative pole of DC/DC converter (5) outlet side is connected with one end of current detection circuit (6), connects the power supply ground exporting DC power supply Vo simultaneously;
The other end of current detection circuit (6) is connected with the current detection signal input of the other end of output filter capacitor (7), current and voltage feedback control circuit (12) and the other end of output voltage detecting circuit (8) simultaneously;
The voltage sense signal output of output voltage detecting circuit (8) is connected with the voltage sense signal input of current and voltage feedback control circuit (12);
The voltage Vc output starting power supply (10) is connected with the voltage Vc input of current and voltage feedback control circuit (12);
Described DC/DC converter (5) adopts Buck circuit of synchronous rectification topology;
It is characterized in that: described rectification mode control circuit (9) comprises resistance R6 to resistance R10, comparator and the first N-channel MOS pipe (M1);
One end of resistance R6 is connected with one end of one end of resistance R7, resistance R10 and the forward signal input of comparator;
The other end of resistance R7 is connected with the source electrode of one end of resistance R9 and the first N-channel MOS pipe (M1) simultaneously;
The other end of resistance R9 is connected with the non-inverting signal input thereof of comparator with one end of resistance R8 simultaneously, the while of the other end of the signal output part of comparator and resistance R10 and the grid of the first N-channel MOS pipe (M1) be connected;
The other end of resistance R8 connects the positive pole of DC power supply Vc;
The other end of resistance R6 is the busbar voltage detection signal input of rectification mode control circuit (9).
2. the Buck structure stabilized voltage power supply of a kind of wide range AC voltage input according to claim 1, is characterized in that:
Described startup power supply (10) comprises resistance R11-resistance R18, the second N-channel MOS pipe (M2), the 3rd N-channel MOS pipe (M3), the 4th N-channel MOS pipe (M4), voltage-stabiliser tube Z1 to voltage-stabiliser tube Z4, diode D7, diode D8 and electric capacity C3;
One end of resistance R11 is connected with one end of one end of resistance R14 and resistance R15 simultaneously;
The other end of resistance R11 is connected with the drain electrode of the second N-channel MOS pipe (M2), and one end of the grid of the second N-channel MOS pipe (M2) and one end of resistance R12, the negative electrode of voltage-stabiliser tube Z1 and resistance R13 is connected simultaneously;
The source electrode of the second N-channel MOS pipe (M2) is connected with the anode of the other end of resistance R12, the anode of voltage-stabiliser tube Z1 and diode D7 simultaneously;
The drain electrode of the other end of resistance R13 and the negative electrode of the other end of resistance R14, voltage-stabiliser tube Z2, the drain electrode of the 3rd N-channel MOS pipe (M3) and the 4th N-channel MOS pipe (M4) is connected simultaneously;
The other end of resistance R15 is connected with the negative electrode of voltage-stabiliser tube Z3, and the anode of voltage-stabiliser tube Z3 is connected with one end of the 3rd N-channel MOS pipe (M3) grid and resistance R16;
The grid of the 4th N-channel MOS pipe (M4) is connected with one end of R17, and the other end of R17 is connected with the anode of one end of R18 and voltage-stabiliser tube Z4 simultaneously;
The negative electrode of voltage-stabiliser tube Z4 is connected with the anode of D8;
The other end of the other end of R18, the source electrode of the 4th N-channel MOS pipe (M4), resistance R16, the source electrode of the 3rd N-channel MOS pipe (M3), the anode of voltage-stabiliser tube Z2 and one end of electric capacity C3 connect the power supply ground of DC power supply Vc simultaneously;
The negative electrode of diode D7 is connected with the other end of the negative electrode of diode D8 and electric capacity C3 simultaneously;
One end of resistance R11 is the positive pole of the input direct voltage starting power supply (10), and the negative electrode of voltage-stabiliser tube Z4 is the output voltage signal input starting power supply (10).
3. the Buck structure stabilized voltage power supply of a kind of wide range AC voltage input according to claim 1, is characterized in that: described DC/DC converter (5) comprises a MOSFET power switch pipe (T1), the 2nd MOSFET power switch pipe (T2), inductance L and electric capacity C2;
The source electrode of the one MOSFET power switch pipe (T1) is connected with the drain electrode of one end of inductance L and the 2nd MOSFET power switch pipe (T2) simultaneously, and the source electrode of the 2nd MOSFET power switch pipe (T2) is connected with one end of electric capacity C2;
The other end of inductance L is connected with the other end of electric capacity C2;
The drain electrode of the one MOSFET power switch pipe (T1) is the input side positive source of DC/DC converter (5), and the source electrode of the 2nd MOSFET power switch pipe (T2) is the input side power cathode of DC/DC converter (5).
4. the Buck structure stabilized voltage power supply of a kind of wide range AC voltage input according to claim 3, is characterized in that:
Described drive circuit (11) comprises chip I R2113, diode D9, electric capacity C4, resistance R19 and resistance R20;
The VB end of chip I R2113 is connected with the negative electrode of diode D9 and one end of electric capacity C4 simultaneously, the other end of electric capacity C4 is held with the VS of chip I R2113 and is connected, the HO end of chip I R2113 is connected with one end of resistance R19, the LO end of chip I R2113 is connected with one end of resistance R20, the other end of resistance R19 is connected with the grid of a MOSFET power switch pipe (T1), and the other end of resistance R20 is connected with the grid of the 2nd MOSFET power switch pipe (T2).
5. the Buck structure stabilized voltage power supply of a kind of wide range AC voltage input according to claim 4, is characterized in that:
Current and voltage feedback control circuit (12) comprises driving chip and starts control circuit and chip UC3637;
Driving chip starts control circuit and comprises resistance R21 to resistance R26, the 5th N-channel MOS pipe (M5), the 6th N-channel MOS pipe (M6), the 7th N-channel MOS pipe (M7) and voltage-stabiliser tube Z5;
One end of resistance R26 is connected with the negative electrode of voltage-stabiliser tube Z5, and the anode of voltage-stabiliser tube Z5 is connected with the grid of one end of resistance R25 and the 7th N-channel MOS pipe (M7) simultaneously;
The drain electrode of the 7th N-channel MOS pipe (M7) is connected with the grid of the 6th N-channel MOS pipe (M6) and one end of resistance R21 simultaneously, and the other end of resistance R21 and one end of resistance R22, one end of resistance R23 and the anode of diode D9 connect the positive pole of DC power supply Vc simultaneously;
The other end of resistance R22 is connected with the grid of the drain electrode of the 6th N-channel MOS pipe (M6) and one end of resistance R24 and the 5th N-channel MOS pipe (M5) simultaneously;
The source electrode of the other end of resistance R25, the source electrode of the 7th N-channel MOS pipe (M7), the source electrode of the 6th N-channel MOS pipe (M6), the other end of resistance R24 and the 5th N-channel MOS pipe (M5) connects the power supply ground of DC power supply Vc simultaneously;
The other end of resistance R23 and the drain electrode of the 5th N-channel MOS pipe (M5) connect the SD end of chip UC3637 simultaneously;
The A of chip UC3637
oUThold and be connected with the HIN end of chip I R2113, the B of chip UC3637
oUThold and be connected with the LIN end of chip I R2113;
The other end of resistance R26 is the voltage signal inputs of current and voltage feedback control circuit (12).
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