CN102290988A - High-capacity multiple DC-DC (direct current-direct current) power supply - Google Patents
High-capacity multiple DC-DC (direct current-direct current) power supply Download PDFInfo
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- CN102290988A CN102290988A CN2011102551132A CN201110255113A CN102290988A CN 102290988 A CN102290988 A CN 102290988A CN 2011102551132 A CN2011102551132 A CN 2011102551132A CN 201110255113 A CN201110255113 A CN 201110255113A CN 102290988 A CN102290988 A CN 102290988A
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- 230000005669 field effect Effects 0.000 claims description 7
- 238000013021 overheating Methods 0.000 claims description 7
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- 238000004519 manufacturing process Methods 0.000 abstract description 12
- 229910021420 polycrystalline silicon Inorganic materials 0.000 abstract description 10
- 229920005591 polysilicon Polymers 0.000 abstract description 10
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 abstract description 3
- 238000005868 electrolysis reaction Methods 0.000 abstract description 3
- 229910052739 hydrogen Inorganic materials 0.000 abstract description 3
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- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
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Abstract
The invention discloses a high-capacity multiple DC-DC (direct current-direct current) power supply belonging to the technical field of a power supply. The power supply adopts the following technical scheme: the power supply consists of a plurality of DC-DC chopper converters with a same structure, an intelligent controller and an LC (liquid crystal) low-flux filter, wherein each DC-DC chopper converter consists of an IGBT (insulated gate bipolar transistor) and a drive circuit thereof; drain electrodes of IGBTs of the DC-DC chopper converters are connected together and then are connected with an input voltage, and source electrodes of IGBTs of the DC-DC chopper converters are connected together and then are connected with loads through the LC low-flux filter; a gate pole of each IGBT is connected with the intelligent controller through the drive circuit; and a follow current diode is arranged between the LC low-flux filter and the IGBTs. The power supply disclosed by the invention can meet the requirement of fields such as polysilicon manufacturing, hydrogen production, electrolysis, electroplating and the like to the power, and has the advantages of simple structure, small and smart volume, convenience for manufacturing, good effect of pressure and current stabilizing, high reliability, environmental-friendliness and the like.
Description
Technical field
The present invention relates to a kind of high-power DC power supply that is applicable to fields such as production of polysilicon, hydrogen manufacturing, electrolysis and plating, belong to power technique fields.
Background technology
In recent years, along with the inclination of new forms of energy policy, the demand of solar-grade polysilicon is increasing.Big capacity power source is the necessary visual plant of production of polysilicon, at present, production of polysilicon generally adopts polysilicon communication power supply or silicon controlled rectification power source, it is big that AC power exists the front end filter volume, shortcomings such as control circuit complexity, and high power voltage regulator complex structure in the silicon controlled rectifier is made difficulty.These two kinds of power supplys all do not have stand-by unit, and reliability is undesirable, and efficient is lower, and harmonic wave is big.Adopt the DC-DC Chopper Regulators can overcome above-mentioned shortcoming, but because single power electronic device allows the electric current that passes through less, the power of existing DC-DC Chopper Regulators far can not satisfy the requirement of production of polysilicon.Therefore, how designing the ideal source that is applicable to production of polysilicon that a kind of volume is small and exquisite, simple in structure, easy to make, capacity is big, harmonic wave is little, reliability is high, is the present difficult problems that face of relevant technologies personnel.
Summary of the invention
The present invention be used to overcome above-mentioned prior art defective, provide big multipleization of the capacity DC-DC power supply that a kind of volume is small and exquisite, simple in structure, easy to make, harmonic wave is little, reliability is high and efficient is high, to satisfy the requirement of production of polysilicon.
The alleged problem of the present invention realizes with following technical proposals:
A kind of big multipleization of capacity DC-DC power supply, form by the identical DC-DC Chopper Regulators of a plurality of structures, intelligent controller and LC low pass filter, each DC-DC Chopper Regulators is formed by IGBT and drive circuit thereof, after linking together, the drain electrode of IGBT in a plurality of DC-DC Chopper Regulators connects input voltage, source electrode links together after the LC low pass filter connects load, the gate pole of each IGBT is connected with intelligent controller through its drive circuit, is provided with fly-wheel diode between LC low pass filter and IGBT.
Above-mentioned big multipleization of capacity DC-DC power supply, the drive circuit of described IGBT is by pulse transformer, field effect transistor, three triodes, resistance, electric capacity is formed, first triode is serially connected in the control loop of pulse transformer, its base stage connects the output of intelligent controller through first resistance, the grid of described field effect transistor connects the pulse signal output end of pulse transformer, its drain electrode connects positive bias-voltage through second resistance, source electrode connects negative bias voltage, second triode and the 3rd triode are connected into totem-pote circuit, the drain electrode of the input termination field effect transistor of described totem-pote circuit, output connects the gate pole of IGBT through the 3rd resistance, and first electric capacity and second electric capacity are connected on respectively between the emitter and collector electrode of second triode and the 3rd triode.
Above-mentioned big multipleization of capacity DC-DC power supply, each IGBT is provided with overheating protection circuit, described overheating protection circuit is made up of thermistor, operational amplifier, resistance and electric capacity, described thermistor is installed on the fin of IGBT, the in-phase input end of described operational amplifier connects reference voltage through the 4th resistance, the CAP1 end of output termination intelligent controller; The 5th resistance with connect supply voltage after thermistor is connected into the bleeder circuit of connecting, the RC filter that the output signal of their serial connection points is formed via the 6th resistance and the 3rd electric capacity connects the inverting input of operational amplifier.
Above-mentioned big multipleization of capacity DC-DC power supply; each IGBT is provided with current foldback circuit; described current foldback circuit is made up of two triodes, potentiometer, diode and resistance; the 4th triode is connected into the common emitter amplifying circuit; the 7th resistance is its collector load; the base stage of the 4th triode connects the gate pole of IGBT; collector electrode connects the drain electrode of IGBT and through potentiometer ground connection through diode; the grounded emitter of the 5th triode; base stage connects the sliding end of potentiometer, and collector electrode connects the CAP0 end of intelligent controller and connects positive source through the 8th resistance.
A plurality of IGBT timesharing conductings that the present invention utilizes intelligent controller control to be connected in parallel, allow a plurality of IGBT bear the required big electric current of load jointly, not only increased the power of power supply, solved the problem that present single power electronic device can not satisfy the requirement of high power D C-DC converter, and improved equivalent switching frequency, reduce the volume and weight of inductance capacitor element in the LC filter, improved the power density of converting means.In addition, each Chopper Regulators of the present invention also has standby each other function, and all the other converters also can work on after a Chopper Regulators broke down, and had improved the overall reliability of power supply.
This device not only can satisfy the requirement of fields such as production of polysilicon, hydrogen manufacturing, electrolysis, plating to power, and have simple in structure, volume is small and exquisite, easy to make, voltage stabilization and current stabilization is effective, reliability is high, do not produce advantages such as environmental pollution, is the regeneration product of traditional phase control rectifier power supply.
Description of drawings
The invention will be further described below in conjunction with accompanying drawing.
Fig. 1 is an electric theory diagram of the present invention;
Fig. 2 is the electrical schematic diagram of one embodiment of the present of invention (3 copped wave unit);
Fig. 3 is the electrical schematic diagram of drive circuit;
Fig. 4 is the electrical schematic diagram of overheating protection circuit;
Fig. 5 is the electrical schematic diagram of current foldback circuit;
Fig. 6 is multiple chopped waveform figure.
Each label is among the figure: IGBT1～IGBT3, insulated gate bipolar transistor; I1～I3, current foldback circuit; H1～H3, overheating protection circuit; QD1～QD3, drive circuit; Si, current sensor; Sv, voltage sensor; D, fly-wheel diode; VD, diode; C0～C3, electric capacity; R1～R8, resistance; W, potentiometer; F, operational amplifier; Rt, thermistor; FET, field effect transistor; T, pulse transformer; L, flat ripple inductance.
Embodiment
Referring to Fig. 2, a plurality of DC-DC Chopper Regulators of the present invention are formed by IGBT, drive circuit and protective circuit three parts.All IGBT all are connected between power supply and the load.
The basic Chopper Regulators operation principle of DC-DC
The conversion principle of the basic Chopper Regulators of DC-DC is the direct current that direct current is changed to another fixed voltage or adjustable voltage, and by changing the switching frequency of power device, duty recently changes the size of output dc voltage.If the ON time of power device is
, the turn-off time is
, then under input voltage E controlled condition, control
,
Relative length, just may command output average voltage U
oSize, realize lossless direct current voltage reulation.The basic Chopper Regulators of DC-DC is generally buck convertor.
Multiple chopper circuit
The present invention inserts the identical basic Chopper Regulators of DC-DC of a plurality of structures between power supply and load, be provided with three basic Chopper Regulators of DC-DC among Fig. 2, its total output current is 3 the basic Chopper Regulators output current of DC-DC sums, and ripple frequency also is 3 times of ripple frequency of the basic Chopper Regulators of single DC-DC.
Can be if will change the average voltage of circuit output by changing the ON time T of power device
OnOr switching frequency f
0Realize that promptly chopper circuit has pulse-width modulation and two kinds of control modes of pulse frequency modulation, can select according to need of work.According to the work characteristics of triple chopper circuits, control strategy is: the grid cycle of being added with of 3 power devices is that T, phase time differ T/3, ON time T successively
OnIdentical drive signal.If will realize the pulse width modulation controlled of output voltage, change the pulsewidth T of drive signal
OnGet final product; If will realize the pulse frequency modulation control of output voltage, only need to change the frequency f of drive signal.
As can be seen from Figure 6, the pulsation amplitude of 3 electric currents is cancelled each other, and makes total output current pulsation amplitude become very little.Square being inversely proportional to of the maximum pulsation rate of total output current of multiple chopper circuit (being the current pulsation amplitude and the ratio of current average) and the number of phases, and the output current ripple frequency improves, therefore multiple chopper circuit is compared with single-phase chopper circuit, at the maximum pulsation rate one of output current regularly, the total weight of required smoothing reactor greatly alleviates.At this moment, source current is the electric current sum of each power device, when its ripple frequency is single chopper circuit 3 times, and harmonic component significantly reduces during than single chopper circuit, and the maximum pulsation rate of source current also is and square being inversely proportional to of the number of phases.This makes the inductive interference that is caused by source current reduce greatly, if need filtering, only need connect simple LC filter just can fully prevent inductive interference.
Multipleization chopper circuit also has standby functions, and each chopper circuit unit can be standby each other, if a certain copped wave unit breaks down, all the other each unit can continue operation, makes overall reliability improve.
Fig. 3 is the drive circuit of IGBT, and wherein T is a pulse transformer, plays isolated controlling module and main circuit, R3 is the resistance of drive circuit, surge current when being used to suppress to drive, Q2 and Q3 constitute totem-pote circuit, are used for reliably opening shutoff high power IGBT device.Owing to be capacitive input impedance, so IGBT gathers also very sensitively to gate charge, and drive circuit has the discharge loop of a low impedance value.Drive source opposite house electrode capacitance with low internal resistance discharges and recharges, gate pole control voltage V
GSEnough precipitous edge, front and back is arranged, and the switching loss of the IGBT that makes is very little.After IGBT opened in addition, the gate-drive source provided enough power to make IGBT be in full state.Positive bias-voltage+VGG in the drive circuit of IGBT is+15V～+ 20V, back bias voltage-VGG is-10V～-2V.IGBT works in the high pressure occasion, and drive circuit and The whole control circuit be strict the isolation on current potential.This drive circuit is simple and practical, has the IGBT self-protection function, and stronger antijamming capability is arranged.During big inductive load, the turn-off time of IGBT can be not too short, limited the formed peak voltage of di/dt, guarantees the safety of IGBT.
Fig. 4 is the overheating protection circuit of IGBT; there are certain given relation in the junction temperature of IGBT and the temperature of radiator; so can thermistor Rt be installed on the IGBT fin, give DSP by the high-low level of CAP1 and handle, and then send control impuls and turn-off and open IGBT.Rt is the thermistor with positive temperature coefficient, V
RefBe reference voltage.During the circuit operate as normal, CAP1 is a high level, and DSP detects high level and do not send interruption pulse; When device surpassed temperature extremes, the thermistor resistance raise, and the CAP1 output low level after the low level that DSP detects, is blocked drive pulse signal, turn-offs IGBT, makes device out of service, realizes overtemperature protection.
Fig. 5 is the current foldback circuit of IGBT, and under the normal running conditions, when the IGBT gate signal was high level, Q4 ended, V
CcThrough R7, VD, IGBT discharge; When gate signal is low level, Q4 conducting, V
CcDischarge through R7, Q4.In case the current-sharing fault occurs, the electric current of a certain road IGBT sharply increases, and then the pressure drop on the IGBT raises rapidly, VD is cut off, and the pressure drop on the W raises, and makes the Q5 conducting, the CAP0 signal becomes 0, and this signal is transferred to the capturing unit of DSP, blocks the output of drive pulse signal.
The intelligent controller of this device mainly is made of DSP+FPGA controller, PWM generation, PID control and multiple logic protection.Replace simulation control with Digital Control, can eliminate the shortcoming that conventional simulation adjusters such as temperature drift are difficult to overcome, helping parameter tuning and variable element regulates, be convenient to regulate controlling schemes easily and realize multiple Novel Control by the change of software program, can reduce simultaneously the components and parts number, simplify hardware configuration, thereby improve system reliability.
The LC low pass filter of this device is made up of flat ripple inductance L and capacitor C 0, and current sensor Si and voltage sensor Sv give intelligent controller with the electric current and the Voltage Feedback of power output end, form close loop control circuit, realize accurately control and protection.Intelligent controller is compared current sensor Si and voltage sensor Sv voltage, the electric current of returning of sampling with the electric current and voltage of setting, calculate the duty ratio width of trigger impulse then, the trigger angle of control IGBT; For each copped wave unit, road, pulse frequency is 7KHz, and the frequency of triple modular redundant structure output is 21KHz, and capacity specifications is: 500A/600V, 3000A/600V.
Claims (4)
1. one kind big multipleization of capacity DC-DC power supply, it is characterized in that, it is made up of the identical DC-DC Chopper Regulators of a plurality of structures, intelligent controller and LC low pass filter, each DC-DC Chopper Regulators is formed by IGBT and drive circuit thereof, after linking together, the drain electrode of IGBT in a plurality of DC-DC Chopper Regulators connects input voltage, source electrode links together after the LC low pass filter connects load, the gate pole of each IGBT is connected with intelligent controller through its drive circuit, is provided with fly-wheel diode (D) between LC low pass filter and IGBT.
2. according to described big multipleization of the capacity DC-DC power supply of claim 1, it is characterized in that, the drive circuit of described IGBT is by pulse transformer (T), field effect transistor (FET), three triodes, resistance, electric capacity is formed, first triode (Q1) is serially connected in the control loop of pulse transformer (T), its base stage connects the output of intelligent controller through first resistance (R1), the grid of described field effect transistor (FET) connects the pulse signal output end of pulse transformer (T), its drain electrode connects positive bias-voltage through second resistance (R2), source electrode connects negative bias voltage, second triode (Q2) and the 3rd triode (Q3) are connected into totem-pote circuit, the drain electrode of the input termination field effect transistor (FET) of described totem-pote circuit, output connects the gate pole of IGBT through the 3rd resistance (R3), and first electric capacity (C1) and second electric capacity (C2) are connected on respectively between the emitter and collector electrode of second triode (Q2) and the 3rd triode (Q3).
3. according to claim 1 or 2 described big multipleization of capacity DC-DC power supplys, it is characterized in that, each IGBT is provided with overheating protection circuit, described overheating protection circuit is made up of thermistor (Rt), operational amplifier (F), resistance and electric capacity, described thermistor (Rt) is installed on the fin of IGBT, the in-phase input end of described operational amplifier (F) connects reference voltage through the 4th resistance (R4), the CAP1 end of output termination intelligent controller; The 5th resistance (R5) with connect supply voltage after thermistor (Rt) is connected into the bleeder circuit of connecting, the output signal of their serial connection points connects the inverting input of operational amplifier (F) via the RC filter of the 6th resistance (R6) and the 3rd electric capacity (C3) composition.
4. according to described big multipleization of the capacity DC-DC power supply of claim 3; it is characterized in that; each IGBT is provided with current foldback circuit; described current foldback circuit is by two triodes; potentiometer (W); diode (VD) and resistance are formed; the 4th triode (Q4) is connected into the common emitter amplifying circuit; the 7th resistance (R7) is its collector load; the base stage of the 4th triode (Q4) connects the gate pole of IGBT; collector electrode connects the drain electrode of IGBT and through potentiometer (W) ground connection through diode (VD); the grounded emitter of the 5th triode (Q5); base stage connects the sliding end of potentiometer (W), and collector electrode connects the CAP0 end of intelligent controller and connects positive source through the 8th resistance (R8).
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| CN2011102551132A CN102290988A (en) | 2011-08-31 | 2011-08-31 | High-capacity multiple DC-DC (direct current-direct current) power supply |
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| CN2011102551132A CN102290988A (en) | 2011-08-31 | 2011-08-31 | High-capacity multiple DC-DC (direct current-direct current) power supply |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102646961A (en) * | 2012-04-13 | 2012-08-22 | 奇瑞汽车股份有限公司 | Charging overheat protection system of electric automobile |
| CN108449959A (en) * | 2016-06-20 | 2018-08-24 | 株式会社Lg化学 | Diagnostic system for DC-DC voltage converters |
| CN110106512A (en) * | 2019-04-17 | 2019-08-09 | 河北工业大学 | Device for preparing hydrogen |
| CN110445091A (en) * | 2018-05-03 | 2019-11-12 | 北京北秦安全技术有限公司 | A kind of single-phase arc extinguishing type short-circuit protector |
| CN114258629A (en) * | 2019-08-30 | 2022-03-29 | 罗伯特·博世有限公司 | Method for operating parallel-connected voltage converters |
-
2011
- 2011-08-31 CN CN2011102551132A patent/CN102290988A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102646961A (en) * | 2012-04-13 | 2012-08-22 | 奇瑞汽车股份有限公司 | Charging overheat protection system of electric automobile |
| CN108449959A (en) * | 2016-06-20 | 2018-08-24 | 株式会社Lg化学 | Diagnostic system for DC-DC voltage converters |
| CN110445091A (en) * | 2018-05-03 | 2019-11-12 | 北京北秦安全技术有限公司 | A kind of single-phase arc extinguishing type short-circuit protector |
| CN110106512A (en) * | 2019-04-17 | 2019-08-09 | 河北工业大学 | Device for preparing hydrogen |
| CN114258629A (en) * | 2019-08-30 | 2022-03-29 | 罗伯特·博世有限公司 | Method for operating parallel-connected voltage converters |
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Application publication date: 20111221 |