CN106134505B - A kind of many output two-stage DC/DC converter that adopts composite PCB type transformer - Google Patents
A kind of many output two-stage DC/DC converter that adopts composite PCB type transformerInfo
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- CN106134505B CN106134505B CN201110011354.2A CN201110011354A CN106134505B CN 106134505 B CN106134505 B CN 106134505B CN 201110011354 A CN201110011354 A CN 201110011354A CN 106134505 B CN106134505 B CN 106134505B
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Abstract
Adopt many output two-stage DC/DC converter of composite PCB type transformer, comprise a main part of circuit (1), main part of circuit comprises front stage converter (3) and the rear class converter (4) of cascade; Front stage converter (3) by busbar voltage after surge current suppression circuit (5) protection and EMI input filter circuit (6) filtering, make busbar voltage be transformed into N road output voltage by push-pull type circuit (7) and transformer isolation circuit (8), every road output voltage is exported to rear class converter (4) respectively after rectification and filter circuit (9) smothing filtering; Voltage after the smothing filtering of the output secondary adjustment loop reception prime output in rear class converter (4), according to every road output current size, the voltage of input is regulated, the voltage after adjusting is exported respectively under the SECO of each passage output relay and control loop (11). The present invention overcomes the deficiencies in the prior art, can be applicable to multiple spacecraft and output way many, reliability is high.
Description
Technical field
The invention belongs to space flight general technical field, relate to a kind of the how defeated of avionics equipment power supply that be applied toGo out two-stage DC/DC converter.
Background technology
The develop rapidly of spacecraft proposes more and more higher requirement, spacecraft power supply system to its power-supply systemPower supply kind is also in continuous increase, also more and more obvious to the trend of multi-output power supply development. At present, domesticThe import DC/DC converter of spacecraft application mostly is single output translator, external well-known aerospace level power supplySupplier only can provide multi-output dc/DC converter of limited several types, and be specific voltage,Many output translators of certain power, poor with respect to the flexibility of domestic market application.
There is at present disclosed multi-output dc/DC converter. For example, Huawei Tech Co., Ltd's applicationPatent publication No. be CN 1577202A, name is called feedback circuit and the realization side of multi-output switch power sourceIn method, disclose a kind of feedback circuit implementation method of multi-output switch power source, comprised according to power supply output electricityThat presses requires amplitude excursion, determines the shared total sampling power supply of feedback sample electric current of every road power supply outputPercentage, and obtain feedback sample electric current by this percentage Cong Mei road power supply, Jiang Ge road sample rate current is added shapeBecome feedback signal, after this feedback signal and reference voltage are compared, output control signals to Switching Power SupplyControl end, with regulation output voltage and make its protection constant. For example, Mitsumi Electric Co., Ltd.'s application is specialProfit publication number is CN 1841898A, and name is called the special of multi-output type DC/DC converter and control method thereofProfit discloses one and not only can under electric current discontinuous mode, move, and can be at current continuity mouldMulti-output dc/DC the converter moving under formula. For example, the patent public affairs of 3W Power Holdings B. V.'s applicationThe number of opening is CN 101467342A, and the patent that name is called the DC to DC converter with many outputs disclosesA kind of DC/DC converter, comprises that transformer has armature winding and at least the first secondary windings and secondSecondary windings, is connected to the first secondary windings main output and comprises synchronous rectifier circuit, the first inductorWith the main output channel of the first capacitor, and DC supply voltage is connected to armature winding and comprises by firstPulse width modulator control is to regulate the on-off circuit of main output voltage by the electric current in switch armature windingInput channel.
Summarize, current disclosed multi-output dc/DC converter, remains in following weak point: (1)Be simple point out front stage converter and rear class converter be multi-phase converter, do not point out concrete conversionDevice topological structure type; (2) only mention the control method of front stage converter and rear class converter, not to how defeatedThe method for designing of removing from mould power transformer is set forth, and cannot utilize a power transformer realization to reach eightRoad output; (3) all cannot realize each road output to many output translators and accurately control, the output of Shi Ge roadVoltage reaches high-precision requirement in full-load range; (4) all do not relate to the each road output of many output translatorsUpper and lower electric SECO and failover; (5) break-even main part of circuit and fallback circuit.
Summary of the invention
Technology of the present invention is dealt with problems and is: overcome the deficiencies in the prior art, provide one can be applicable to manyKind of spacecraft, output way are many, the much higher output two-stage of reliability DC/DC converter.
The technical problem that the present invention further solves is: converter cross regulation rate provided by the invention is excellent, eachPassage output voltage all can reach high-precision requirement in full-load range.
Technical solution of the present invention is: a kind of many output two-stage that adopts composite PCB type transformerDC/DC converter, is characterized in that: comprise a main part of circuit, main part of circuit comprises that the prime of cascade becomesParallel operation and rear class converter;
Front stage converter is protected busbar voltage and the filtering of EMI input filter circuit through surge current suppression circuitAfter, make busbar voltage be transformed into N road output voltage, every road by push-pull type circuit and transformer isolation circuitOutput voltage is exported to rear class converter respectively after rectification and filter circuit smothing filtering; In rear class converterOutput secondary adjust the voltage after the smothing filtering that loop receives prime output, large according to every road output currentThe little voltage to input regulates, and the voltage after adjusting is respectively at each passage output relay and control loopSECO under export;
Described transformer isolation circuit adopts power transformer T to realize, and power transformer T comprises N+2 altogetherIndividual winding: N the secondary winding that main converter part comprises former limit winding and exists with centre cap form,Accessory power supply part comprises former limit accessory power supply winding; Former limit winding is made up of former limit 1 and former limit 2, former limit1 different name end is connected with the Same Name of Ends on former limit 2, is made as the former limit common port of power transformer T; Each pairLimit winding comprises two secondary, and the different name end of one of them secondary is connected with the Same Name of Ends of another secondary, asThe common port of this secondary winding; The span 4～8 of above-mentioned N.
Also comprise a fallback circuit identical with main part circuit, the same voltage in main fallback circuit, same to electric currentOutput be directly connected.
Described rectification and filter circuit are made up of the loop of N road same structure, and each loop comprises two twoUtmost point pipe D-1, D-2, differential mode inductance L-1, differential mode capacitor C-1; The anode of diode D-1, D-2 respectivelyBe connected with Same Name of Ends, the different name end of the corresponding secondary winding of power transformer T; Diode D-1, D-2'sCommon cathode is extremely connected with one end of differential mode inductance L-1, the other end of differential mode inductance L-1 and differential mode capacitor C-1One end be connected, the public affairs of the other end of differential mode capacitor C-1 and the corresponding secondary winding of above-mentioned power transformer TEnd is connected altogether.
Described output secondary is adjusted loop and is made up of the loop of N road same structure, and each loop comprises two kindsThe loop of type, one is BUCK regulator loop, another kind is low-dropout regulator loop; 0.4AThe passage of above electric current output adopts BUCK circuit of synchronous rectification to regulate, and other passage adopts low voltage differenceVoltage regulator circuit regulates.
Described BUCK regulator loop comprises two devices M-1, M-2, output differenceMould inductance L-2, output differential mode capacitor C-2; The drain electrode end of the first devices M-1 and rectification andThe differential mode inductance L-1 of filter circuit is connected with the common port of differential mode capacitor C-1, the first synchronous rectification MOSThe source terminal of pipe M-1 is connected with the drain electrode end of the second devices M-2, output differential mode inductance L-2One end also access the source terminal of the first devices M-1, another of output differential mode inductance L-2End is connected with one end of output differential mode capacitor C-2, and the other end of output differential mode capacitor C-2 is synchronizeed whole with secondThe source terminal of stream metal-oxide-semiconductor M-2 is connected, and the source terminal of the second devices M-2 is defined as defeatedGo out secondary and adjust the cathode output end that loop is connected.
Described low-dropout regulator loop comprises low-dropout regulator LDO and output differential mode capacitor C-3; LowPressure reduction voltage-stablizer LDO is three terminal regulator, its electrode input end and rectification and filter circuit respective channel poorMould inductance L-1 is connected with the common port of differential mode capacitor C-1, right in its negative input and power transformer TAnswer the common port of secondary winding to be connected, its cathode output end is connected with one end of output differential mode capacitor C-3, defeatedThe other end that goes out differential mode capacitor C-3 is connected with the negative pole end of three terminal regulator LDO, three terminal regulator LDONegative pole end be defined as output secondary and adjust the cathode output end connected of loop.
Described output relay and control loop are made up of the loop of N road same structure, and each loop comprisesResistance R-1, resistance R-2, diode D-3, diode D-4, relay K; Relay K switch defeatedEnter the output differential mode inductance in the BUCK regulator loop of end and output relay and control loop place passageL-2 is connected with the common port of output differential mode capacitor C-2, and relay K output switching terminal is defined as output relayThe cathode output end of device and control loop place passage; After resistance R-1 and resistance R-2 parallel connection, one end accessInstruction bus, the other end is connected with the cathode terminal of diode D-3, the anode tap of diode D-3 and diodeThe cathode terminal of D-4 is connected, the switch input signal K1-ON of the anode tap cut-in relay K of diode D-4,The cathode terminal of diode D-3 is connected with the line bag two ends of relay K respectively with the anode tap of diode D-4.
The present invention's advantage is compared with prior art:
(1) the present invention proposes the many output two-stage DC/DC converter topology knot in a kind of spacecraft applicationStructure, can be transformed to multiple voltage level by spacecraft busbar voltage neatly, and each passage output voltage all canIn full-load range, reach high-precision requirement, effectively reduced the volume and weight of spacecraft power supply system.
(2) to export the front stage converter in two-stage DC/DC converter topology be push-pull converter more in the present inventionTopology, rear class converter is BUCK synchronous rectifier converter topology or low-dropout regulator circuit.
(3) front stage converter push-pull converter topology of the present invention has adopted compound multi-layer PCB template transformationDevice method for designing, utilizes a transformer to realize nearly eight tunnel outputs, has made up preferably many output translatorsThe design defect that the middle power transformer number of turn is many, winding structure is complicated, has greatly simplified the structure of transformerDesign.
(4) rear class converter of the present invention intersects and adopts neatly different electricity according to each passage output current sizeRoad topology realizes precise pressure regulation, wherein, adopts BUCK synchronous rectification topology to adjust compared with High-current output passageJoint, small electric stream output channel adopts low-dropout regulator circuit adjustment.
(5) the present invention is in the each output port setting of rear class converter of many output two-stage type DC/DC convertersRelay and corresponding control circuit thereof, to realize upper and lower electric SECO and the failover of converter,Make the control function of many output two-stage DC/DC converters more perfect.
(6) multi-output dc/DC converter of the present invention's development can be transformed to busbar voltage many neatlyPlant voltage levvl to meet the application demand of spacecraft, increased the confession of domestic aerospace level DC/DC converterElectricity kind, has improved the reliability of spacecraft for distribution applications system, can be widely used in high-resolution satelliteIn the payload system of CCD camera and multiple spacecraft model.
Brief description of the drawings
Fig. 1 is the circuit theory diagrams that the present invention exports two-stage DC/DC converter more;
Fig. 2 is the surge current suppression circuit schematic diagram that the present invention exports two-stage DC/DC converter more;
Fig. 3 is the EMI input filter circuit schematic diagram that the present invention exports two-stage DC/DC converter more;
Fig. 4 is that the present invention exports recommending of two-stage DC/DC converter and current rectifying and wave filtering circuit schematic diagram more;
Fig. 5 is the output secondary adjustment circuit theory figure that the present invention exports two-stage DC/DC converter more;
Fig. 6 is output relay and the control loop schematic diagram that the present invention exports two-stage DC/DC converter more;
Fig. 7 (a) and (b) for the present invention exports the composite multi-layer pcb board of two-stage DC/DC converter moreType transformer device structure figure.
Detailed description of the invention
The circuit structure that the present invention exports two-stage DC/DC converter more as shown in Figure 1, this many output two-stageDC/DC converter comprises main part of circuit 1 of redundancy and fallback circuit 2, the complete phase of circuit structure and control methodWith. Taking main part of circuit 1 as example, comprise front stage converter 3 and the rear class converter 4 of cascade.
Front stage converter 3 is protected the input filter circuit with EMI by busbar voltage through surge current suppression circuit 5After 6 filtering, make busbar voltage be transformed into the output of N road by push-pull type circuit 7 and transformer isolation circuit 8Voltage, every road output voltage is exported to rear class converter 4 respectively after rectification and filter circuit 9 smothing filterings;Voltage after the smothing filtering of rear class converter 4 Zhong Mei road output secondaries adjustment loops reception prime outputs,According to every road output current size, the voltage of input is regulated, the voltage after adjusting is defeated at each passage respectivelyGo out under the SECO of relay and control loop 11 and export; The scope of above-mentioned N is 4～8 and and transformerIn buffer circuit 8, the secondary winding quantity of power transformer T is consistent. Taking 8 passages as example, be situated between in detail belowSpecific implementation process of the present invention continues.
As shown in Figure 1, front stage converter 3 comprises surge current suppression circuit 5, EMI input filter circuit6, push-pull type circuit 7, transformer isolation circuit 8, rectification and filter circuit 1 to 8. Front stage converterOperation principle be by busbar voltage after surge current suppression circuit protection and the filtering of EMI input filter circuit,By push-pull type circuit and transformer isolation circuit, busbar voltage is transformed into the corresponding output voltage in each road, shouldVoltage changes with the variation of busbar voltage, then through rectification and filter circuit 1 to 8 smothing filtering.
The structure of surge current suppression circuit 5 as shown in Figure 2, comprises Inrush current restraining metal-oxide-semiconductor M1,Divider resistance R1, R2 and R3, surge capacitor C 1 and voltage-stabiliser tube Z1. One end of divider resistance R1 and defeatedEnter power positive end and be connected, the other end of divider resistance R1 is connected with the cathode terminal of voltage-stabiliser tube Z1, surge electricityAppearance C1 is polarity free capacitor, the two ends of surge capacitor C 1 respectively with cathode terminal and the surge electricity of voltage-stabiliser tube Z1The source terminal that stream suppresses metal-oxide-semiconductor M1 is connected, the cathode terminal of one end of divider resistance R2 and voltage-stabiliser tube Z1Be connected, the gate terminal of the other end access Inrush current restraining metal-oxide-semiconductor M1 of divider resistance R2, point piezoelectricityThe two ends of resistance R3 are connected with source terminal with the gate terminal of Inrush current restraining metal-oxide-semiconductor M1 respectively, surge electricityStream suppresses the source terminal of metal-oxide-semiconductor M1 and the anode tap of voltage-stabiliser tube Z1 all accesses input power negative pole end.
In the time that spacecraft busbar voltage is inputted, the grid voltage of Inrush current restraining metal-oxide-semiconductor M1 is with capacitance-resistanceThe time constant of setting rises exponentially, when reaching after cut-in voltage, and Inrush current restraining metal-oxide-semiconductorM1 is conducting gradually thereupon, through the regular hour postpone, the capacitance voltage of EMI input filter circuit 6 from0V rises to the input value of spacecraft busbar voltage gradually, large while having avoided instant high-voltage to capacitor chargingThe surge current that electric current causes bus of spacecraft impacts, after startup, and Inrush current restraining MOSPipe M1 is in saturation conduction state, and the electric current bearing is the input current of many output two-stage DC/DC converters.
The structure of EMI input filter circuit 6 as shown in Figure 3, comprises input common mode inductance L1, input differential modeInductance L 2, input common mode capacitance C3 and C4, input differential mode capacitor C2 and C5. Input differential mode capacitor C2Be polarity free capacitor, its one end is connected with input power positive terminal, the other end and described Inrush current restrainingThe drain electrode end of metal-oxide-semiconductor M1 is connected. The Same Name of Ends that input common mode inductance L1 polarity is identical is poor with input respectivelyThe two ends of mould capacitor C 2 are connected, and the common port that input common mode capacitance C3 is connected with C4 picks shell, inputThe other end of common mode capacitance C3 and C4 two different name end phases identical with input common mode inductance L1 polarity respectivelyConnect. One end of input differential mode inductance L2 and input common mode inductance L1 and the common port of inputting common mode capacitance C3Be connected, one end of input differential mode capacitor C5 is public with input common mode inductance L1 and input common mode capacitance C4'sEnd is connected, and the other end of input differential mode inductance L2 is connected with the other end of input differential mode capacitor C5. Input altogetherMould inductance, input differential mode inductance, input common mode capacitance, input differential mode capacitor form low-pass filter circuit jointly,Allow the pulse current of direct current and low frequency to pass through, the noise jamming higher for frequency suppresses.
The structure of push-pull type and current rectifying and wave filtering circuit as shown in Figure 4, comprise push-pull type circuit 7, transformer everyFrom circuit 8, rectification and filter circuit 1 to 8. Push-pull type circuit 7 comprises recommends metal-oxide-semiconductor M2 and M3,Recommend the drain electrode end of metal-oxide-semiconductor M2 and the different name end on former limit 2 is connected, recommend the drain electrode end of metal-oxide-semiconductor M3Be connected with the Same Name of Ends on former limit 1, recommend the source terminal of metal-oxide-semiconductor M2 and the source terminal of M3 is connected, andAnd be connected with the common port of input differential mode capacitor C5 with described input common mode inductance L1. Push-pull type circuitControl and adopt open-loop voltage control method, by the UC1825AL of TI company pwm chip output two-wayPulse-width signal, two paths of signals frequency is identical, pulsewidth equates, and output pulse frequency is 200kHz left and right,Dutycycle is 45%, drives respectively two metal-oxide-semiconductor M2 and the M3 of push-pull type circuit 7, metal-oxide-semiconductorM2 and M3 in turn conducting magnetize power transformer T.
Transformer isolation circuit 8 comprises power transformer T, and power transformer T adopts compound multi-layer PCBSheet-type transformer, by adopting the RM shape magnetic core of TDK company, enters in conjunction with multi-layer PCB printed board windingRow design, exports eight road voltages altogether, has realized miniaturization, the lightweight of multi-output dc/DC converter.Power transformer T comprises 10 windings altogether: main converter part comprises former limit winding and with centre cap shape8 secondary windings that formula exists, accessory power supply part comprises former limit accessory power supply winding. Power transformer TFormer limit, secondary be the winding with center tapped, the former limit winding of power transformer T is by former limit 1 HeFormer limit 2 forms, and the different name end on former limit 1 is connected with the Same Name of Ends on former limit 2, is made as the former of power transformer TLimit common port. Power transformer T secondary 1 to 8 winding is except the number of turn is variant, and circuit connects and namedUniversal class is same. Taking power transformer T secondary 1 winding as example, secondary 1 winding is by 12 groups of secondary 11 and secondaryBecome, the different name end of secondary 11 is connected with the Same Name of Ends of secondary 12, is made as the public affairs of power transformer T secondary 1End altogether. Wherein, the secondary number of turn is that the output voltage by adjusting each passage is determined, guarantees busbar voltageWhile variation within the specific limits, the secondary output of power transformer T still can meet application demand. Former limit is auxiliaryPower supply winding is also by the pair end output voltage of power transformer T, and this voltage is controlled without regulating, secondary aroundGroup is after rectifying and wave-filtering, and the PWM being directly output as in the push-pull type circuit of the former limit of power transformer T controls coreSheet UC1825AL power supply.
Power transformer T take former secondary folder around mode, come by the compound installation of polylith PCB printed boardRealize, each PCB printed board is four laminates. Former limit winding divides two-layer being connected in series, and every layer of number of turn is averageDistributing, is 1/2 of former limit total number of turns. The PCB Winding Design of each passage output is according to output current sizeDetermine, for the larger passage of secondary output current, can adopt the first secondary winding and the second secondary windingParalleling two beds arranges. Former limit accessory power supply winding and the less winding of secondary output current are individual layer setting.Power transformer T design and installation structure is as Fig. 7 (a) with (b), because output channel is more, forBe convenient to design and installation, transformer take axis as boundary, and installation site is designated to transformer side 1 and transformerSide 2, according to the outlet direction difference of each passage output, is divided into four kinds of directions: 0 °, 90 °, 180 °, 270 °.RM magnetic core shown in Fig. 7 is the PC40RM10 of TDK company, corresponding to eight passage output DC/DCConverter, power transformer is formed by the 11 four layers compound installation of PCB printed board altogether.
Rectification and filter circuit 1 to 8 comprise eight loops, and the circuit structure in eight loops is identical. WithRectification and filter circuit 1 are example, comprise diode D1-1 and D1-2, differential mode inductance L1-1, differential mode capacitorC1-1. Wherein, diode D1-1 is commutation diode, and diode D1-2 is fly-wheel diode, diodeD1-1 and D1-2 adopt the Schottky diode of a common cathode of IR company production, realize power transformerThe rectification of T secondary 1 output and afterflow function. Differential mode inductance L1-1 and the output of differential mode capacitor C1-1 compositionFilter circuit, is reducing after the noise and ripple of the 1 output rectification of power transformer T secondary, afterflow end,The good voltage of output characteristics is to rear class converter. Circuit connecting relation is as follows:
The anode tap of diode D1-1 is connected with the Same Name of Ends of power transformer T secondary 11, diode D1-2Anode tap be connected with the different name end of power transformer T secondary 12, the common cathode of diode D1-1 and D1-2Extremely be connected with one end of differential mode inductance L1-1, the other end of differential mode inductance L1-1 and differential mode capacitor C1-1One end be connected, the other end of C1-1 is connected with the common port of power transformer T secondary 1.
Rear class converter 4 comprise output secondary adjust loop 1 to 8, output relay and control loop 1 to8. Output secondary is adjusted after the output voltage of loop 1 to 8 reception front stage converter certain limit, according to respectivelyPassage output current size intersection adopts different circuit topologies to realize output precise pressure regulation neatly, wherein,Larger electric current (more than general 0.4A) output channel adopts BUCK circuit of synchronous rectification to regulate,Little current output channels adopts low-dropout regulator circuit to regulate. At each output port, output relay is setDevice and control loop, to realize upper and lower electric SECO and the failover of converter, make many output twoThe control function of level formula DC/DC converter is more perfect.
The structure in output secondary adjustment loop 1 to 8 as shown in Figure 5, comprises BUCK regulator loop and lowPressure reduction voltage-stablizer loop. Adjust loop 1 as example taking output secondary, this loop is BUCK regulator loop,Comprise devices M1-1, devices M1-2, output differential mode inductance L 1-2,Output differential mode capacitor C 1-2. The drain electrode end of devices M1-1 and differential mode inductance L1-1 and differential modeThe common port of capacitor C 1-1 is connected, the source terminal of devices M1-1 and synchronous rectification MOSThe drain electrode end of pipe M1-2 is connected, and devices is also accessed in one end of output differential mode inductance L 1-2The source terminal of M1-1, the other end of output differential mode inductance L 1-2 and one end phase of output differential mode capacitor C 1-2Connect, the other end of output differential mode capacitor C 1-2 is connected with the source terminal of devices M1-2, withThe source terminal of step rectification metal-oxide-semiconductor M1-2 is defined as the cathode output end of output 1. BUCK adjuster returnsRoad adopts close-loop control mode to realize output voltage fine adjustment, and adopt him to drive type and drive synchronous rectification,Improve the efficiency of whole converter. He drives type and drives synchronous rectification by the UC1845A PWM of TI companyControl chip, the dual input NAND gate chip CD4011 of TI company and the isolation drive chip I R2110 of IR companyThree kinds of control chips are realized. First, UC1845A pwm chip produces a road output pulse frequencyFor the pwm signal of about 200kHz, and output to the input of dual input NAND gate chip CD4011Mouthful, the pwm signal of reception is transformed into common ground by this NAND gate chip two-way frequency is identical, phase place is complementaryPWM pulse-width signal, and by this two paths of signals deliver to respectively isolation drive chip I R2110 height,Low input, isolation drive chip I R2110 by the two-way pwm signal receiving be converted into again a road ground connection,The PWM pulse-width signal that two-way frequency is identical, phase place is complementary on floating ground, another road, drives respectively BUCKMetal-oxide-semiconductor M1-1 and M1-2 in transformer configuration. Output differential mode inductance L 1-2 and output differential mode capacitorC1-2 forms output filter circuit, reduces noise and the ripple of output 1.
Adjust loop 8 as example taking output secondary, this loop is low-dropout regulator loop, comprises that low voltage difference is steadyDepressor LDO8 and output differential mode capacitor C 8-2. Low-dropout regulator LDO-8 is three terminal regulator, adoptsThe IC chip LM2941WG of NationaI company, this chip have overvoltage protection, short-circuit protection andOvertemperature protection characteristic, can realize precise voltage output, its electrode input end and differential mode inductance L8-1 and differential mode electricityThe common port that holds C8-1 is connected, and its negative input is connected with the common port of power transformer T secondary 8,Its cathode output end is connected with one end of output differential mode capacitor C 8-2, and the output of LDO-8 is by output differential modeCapacitor C 8-2 filtering, to reduce noise and the ripple of output 8. The other end of output differential mode capacitor C 8-2 withThe negative pole end of three terminal regulator LDO-8 is connected, and the negative pole end of three terminal regulator LDO-8 is defined as output 8Cathode output end.
The circuit of output relay and control loop 1 to 8 as shown in Figure 6, output relay and control loop1 to 8 circuit structure is identical. Taking output relay and control loop 1 as example, comprise resistance R 1-1,Resistance R 1-2, diode D1-3, diode D1-4, relay K 1. The input of relay K 1 switchBe connected with the common port of output differential mode capacitor C 1-2 with described output differential mode inductance L 1-2, relay K 1Output switching terminal is defined as the cathode output end of output 1. After resistance R 1-1 and resistance R 1-2 parallel connection, one endAccess 28V instruction bus, the other end is connected with the cathode terminal of diode D1-3, the sun of diode D1-3Extremely be connected with the cathode terminal of diode D1-4, the anode tap cut-in relay K1 of diode D1-4 opensClose input signal K1-ON, the anode tap of the cathode terminal of diode D1-3 and diode D1-4 respectively with continueThe line bag two ends of electrical equipment K1 are connected.
Output relay and control loop 1 to 8 be arranged on each output port, to realize the each passage of converterUpper and lower electric SECO and failover, improve the reliabilities of exporting two-stage type DC/DC converters more,The control sequential of each passage output voltage can realize by the preferential upper and lower electrical remote control instruction in outside. According to respectivelyThe character of passage load and size of current are selected suitable relay, consider to suppress counter electromotive force circuit simultaneously and establishMeter, can adopt anti-paralleled diode D1-3 and D1-4 to suppress to produce after relay winding pumping signal disappearsCounter electromotive force, it is good that the method suppresses counter electromotive force inhibition, considers the short circuit failure mode of diode,Use two diode series connection. Relay1 case shielding mode is between relay and casing, first to insulate and to pacify afterwardsDress seals in current-limiting resistance R1-1, R1-2 between shell and ground wire, and the method easily realizes, reliability is high.
The content not being described in detail in description of the present invention belongs to those skilled in the art's known technology.
Claims (7)
1. adopt many output two-stage DC/DC converter of composite PCB type transformer, its featureBe: comprise a main part of circuit (1), main part of circuit comprises front stage converter (3) and the rear class of cascadeConverter (4);
Front stage converter (3) is filtered busbar voltage through surge current suppression circuit (5) protection and EMI inputAfter wave circuit (6) filtering, make bus electricity by push-pull type circuit (7) and transformer isolation circuit (8)Pressure is transformed into N road output voltage, and every road output voltage is respectively through rectification and filter circuit (9) smothing filteringAfter export to rear class converter (4); Output secondary in rear class converter (4) is adjusted loop and is received primeVoltage after the smothing filtering of converter (3) output, enters the voltage of input according to every road output current sizeRow regulates, and the voltage after adjusting is respectively in the SECO of each passage output relay and control loop (11)Lower output;
Described transformer isolation circuit (8) adopts power transformer T to realize, and power transformer T wraps altogetherDraw together N+2 winding: N the secondary that main converter part comprises former limit winding and exists with centre cap formWinding, accessory power supply part comprises former limit accessory power supply winding; Former limit winding is made up of former limit 1 and former limit 2,The different name end on former limit 1 is connected with the Same Name of Ends on former limit 2, is made as the former limit common port of power transformer T; OftenIndividual secondary winding comprises two secondary, and the different name end of one of them secondary is connected with the Same Name of Ends of another secondary,As the common port of this secondary winding; The span 4～8 of above-mentioned N.
2. a kind of many output two-stage that adopts composite PCB type transformer according to claim 1DC/DC converter, is characterized in that: also comprise a fallback circuit (2) identical with main part of circuit (1),Same voltage in main fallback circuit, be directly connected with the output of electric current.
3. a kind of many outputs two that adopt composite PCB type transformer according to claim 1 and 2Level DC/DC converter, is characterized in that: described rectification and filter circuit (9) are by N road same structureLoop composition, each loop comprises two diode D-1, D-2, differential mode inductance L-1, differential mode capacitorC-1; The anode of diode D-1, D-2 respectively with the Same Name of Ends of the corresponding secondary winding of power transformer T,Different name end is connected; The common cathode of diode D-1, D-2 is extremely connected with one end of differential mode inductance L-1, differential modeThe other end of inductance L-1 is connected with one end of differential mode capacitor C-1, the other end of differential mode capacitor C-1 and above-mentionedThe common port of the corresponding secondary winding of power transformer T is connected.
4. a kind of many output two-stage that adopts composite PCB type transformer according to claim 3DC/DC converter, is characterized in that: it is identical by N road that described output secondary is adjusted loop (10)Loop composition, each loop comprises again the loop of two types, one is BUCK regulator loop, anotherPlanting is low-dropout regulator loop; The passage of the above electric current output of 0.4A adopts BUCK regulator loop to carry outRegulate, other passage adopts low-dropout regulator loop to regulate.
5. a kind of many output two-stage that adopts composite PCB type transformer according to claim 4DC/DC converter, is characterized in that: described BUCK regulator loop comprises two synchronous rectification MOSPipe M-1, M-2, output differential mode inductance L-2, output differential mode capacitor C-2; The first devicesThe differential mode inductance L-1 of the drain electrode end of M-1 and rectification and filter circuit (9) and the common port of differential mode capacitor C-1Be connected, the leakage of the source terminal of the first devices M-1 and the second devices M-2Extreme being connected, the source electrode of the first devices M-1 is also accessed in one end of output differential mode inductance L-2End, the other end of output differential mode inductance L-2 is connected with one end of output differential mode capacitor C-2, output differential mode electricityThe other end that holds C-2 is connected with the source terminal of the second devices M-2, the second synchronous rectificationThe source terminal of metal-oxide-semiconductor M-2 is connected with the common port of corresponding secondary winding in power transformer T, and second is sameThe source terminal of step rectification metal-oxide-semiconductor M-2 is defined as the negative pole in output secondary adjustment institute's connection road, loop (10)Output.
6. a kind of many output two-stage that adopts composite PCB type transformer according to claim 4DC/DC converter, is characterized in that: described low-dropout regulator loop comprises low-dropout regulator LDOWith output differential mode capacitor C-3;
Low-dropout regulator LDO is three terminal regulator, its electrode input end and rectification and filter circuit (9)The differential mode inductance L-1 of respective channel is connected with the common port of differential mode capacitor C-1, its negative input and powerIn transformer T, the common port of corresponding secondary winding is connected, its cathode output end and output differential mode capacitor C-3One end is connected, and the output other end of differential mode capacitor C-3 and the negative input of three terminal regulator are connected, three endsThe negative input of voltage-stablizer is defined as the cathode output end in output secondary adjustment institute's connection road, loop (10).
7. a kind of many outputs two that adopt composite PCB type transformer according to claim 1 and 2Level DC/DC converter, is characterized in that: described output relay and control loop (11) are by N roadThe loop composition of same structure, each loop comprises resistance R-1, resistance R-2, diode D-3, diodeD-4, relay K;
The BUCK of the input of relay K switch and output relay and control loop (11) place passageOutput differential mode inductance L-2 in regulator loop are connected with the common port of output differential mode capacitor C-2, relayK output switching terminal is defined as the cathode output end of output relay and control loop (11) place passage; ElectricityAfter resistance R-1 and resistance R-2 parallel connection, one end incoming instruction bus, the cathode terminal of the other end and diode D-3Be connected, the anode tap of diode D-3 is connected with the cathode terminal of diode D-4, the anode tap of diode D-4The switch input signal K1-ON of cut-in relay K, the cathode terminal of diode D-3 and diode D-4'sAnode tap is connected with the line bag two ends of relay K respectively.
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| CN201110011354.2A CN106134505B (en) | 2011-06-09 | 2011-06-09 | A kind of many output two-stage DC/DC converter that adopts composite PCB type transformer |
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| CN201110011354.2A CN106134505B (en) | 2011-06-09 | 2011-06-09 | A kind of many output two-stage DC/DC converter that adopts composite PCB type transformer |
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| CN201110011354.2A Expired - Fee Related CN106134505B (en) | 2011-06-09 | 2011-06-09 | A kind of many output two-stage DC/DC converter that adopts composite PCB type transformer |
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| CN107291014A (en) * | 2017-07-26 | 2017-10-24 | 黑龙江瑞兴科技股份有限公司 | A kind of track traffic control relay circuit |
| CN107369544A (en) * | 2017-09-04 | 2017-11-21 | 云南电网有限责任公司电力科学研究院 | A kind of GIS formulas of band electromagnetic shielding are from the standard potential transformer that boosts |
| CN107579656A (en) * | 2017-08-23 | 2018-01-12 | 北京新能源汽车股份有限公司 | Direct current-direct current converter and electric automobile |
| CN108701991A (en) * | 2016-03-01 | 2018-10-23 | 赛峰电气与电源公司 | Include the power distribution equipment of at least one power controller |
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| CN108701991A (en) * | 2016-03-01 | 2018-10-23 | 赛峰电气与电源公司 | Include the power distribution equipment of at least one power controller |
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| CN107369544A (en) * | 2017-09-04 | 2017-11-21 | 云南电网有限责任公司电力科学研究院 | A kind of GIS formulas of band electromagnetic shielding are from the standard potential transformer that boosts |
| CN107369544B (en) * | 2017-09-04 | 2023-09-15 | 云南电网有限责任公司电力科学研究院 | GIS type self-boosting standard voltage transformer with electromagnetic shielding |
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| CN109088554B (en) * | 2018-09-17 | 2024-01-02 | 深圳市德明利技术股份有限公司 | Power supply device and system for touch screen test |
| CN109217692A (en) * | 2018-11-01 | 2019-01-15 | 鞍山雷盛电子有限公司 | A kind of high-power voltage multiplying rectifier device of layer stereo |
| CN109217692B (en) * | 2018-11-01 | 2024-01-02 | 鞍山雷盛电子有限公司 | Multilayer three-dimensional high-power voltage-multiplying rectifying device |
| CN109525100A (en) * | 2018-11-08 | 2019-03-26 | 深圳航天科技创新研究院 | A kind of power control system of multichannel High voltage output |
| CN112311046A (en) * | 2019-07-26 | 2021-02-02 | 百度（美国）有限责任公司 | Bidirectional multifunctional converter for standby battery unit |
| CN111342553A (en) * | 2020-02-12 | 2020-06-26 | 北京环境特性研究所 | Anti-interference power distribution device and method |
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Granted publication date: 20140409 |