CN108054940A - Capacitance series connection automatically equalizing voltage circuit and its control circuit - Google Patents
Capacitance series connection automatically equalizing voltage circuit and its control circuit Download PDFInfo
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- CN108054940A CN108054940A CN201711363883.2A CN201711363883A CN108054940A CN 108054940 A CN108054940 A CN 108054940A CN 201711363883 A CN201711363883 A CN 201711363883A CN 108054940 A CN108054940 A CN 108054940A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
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Abstract
The present invention provides a kind of capacitance series connection automatically equalizing voltage circuit and its control circuits, and including power circuit, the power circuit includes equalizer circuit and inverter circuit；Control circuit is completing to be detected the filter capacitor terminal voltage in power circuit and press, the control source detected is handled to peripheral circuit, the comparison signal that processing obtains is fed back in analog circuit to the feedback input end for controlling chip, output drive signal after control chip handles the signal of each input port, drive the on off state of the power device in the power circuit, by the primary and secondary side energy transmission of equalizer circuit circuit so that the filter capacitor in the power circuit realizes automatically equalizing voltage.The present invention can be when power circuit be connected using multiple filter capacitors so that filter capacitor can realize automatically equalizing voltage, have the characteristics of control is simple, response quickly, voltage equalizing is good, can be applied in the practical applications such as semi-bridge inversion type plasma cutting machine.
Description
Technical field
The present invention relates to a kind of equalizer circuits and its control circuit of Technics of Power Electronic Conversion technical field, and in particular, to
A kind of capacitance series connection automatically equalizing voltage circuit and its control circuit.
Background technology
In current middle low power application scenario, since half-bridge circuit has simple in structure, easily controllable and direct current
The advantages that side improves pressure-resistant effect using the series connection of capacitance, therefore has obtained relatively broad application, but this circuit is normal
It is connected using several filter capacitors, the asking there is capacitor voltage equalizing due to capacitor's capacity, ohmic leakage and circuit parameter etc.
Topic.
The hidden danger of capacitance voltage un-balance cannot be ignored, if voltage equalizing is bad, may result in capacitance over-voltage breakdown,
Control signal generates the problems such as deviation, output waveform distortion or even makes system out of control.Therefore capacitor voltage equalizing problem should cause height
Degree is paid attention to, it is necessary to using appropriate pressure measure the situation of capacitance voltage un-balance be avoided to generate.
By the retrieval discovery to the capacitor series average-voltage prior art, Lin B.R.Hung T.L.Single-phase
half-bridge converter topology for power quality compensation.IEE Proceedings
Electric Power Applications, 2002,149 (5)：351~359. propose to increase component in power circuit
Solve DC partial voltage capacitance voltage offset issue.But such a process increases the volume weight of converter, cost is increased, and
And cannot fundamentally ensure the electric voltage equalization of series capacitance, reality effect is undesirable.
The content of the invention
For in the prior art the defects of, the object of the present invention is to provide a kind of capacitance series connection automatically equalizing voltage circuits and its control
Circuit processed realizes that multiple filter capacitors in power circuit remain electric voltage equalization, has and controls easy, response quickly,
The advantages of pressing effect good.
First purpose according to the present invention, provides a kind of capacitance series connection automatically equalizing voltage circuit, and the circuit includes power electricity
Road, the power circuit include balancer-transformer and inverter circuit, wherein：
It is secondary that secondary of the equalizer circuit equipped with balancer-transformer Tr1, the balancer-transformer Tr1 is equipped with the first~the 3rd
Side winding N12, N11, N13 and the second~the 4th diode D2, D3, D4；
The inverter circuit is inverse by capacitance bridge arm, resistance bridge arm, IGBT bridge arms, the first contravariant transformer Tr2 and second
Become transformer Tr3 compositions, wherein：Capacitance bridge arm is sequentially connected in series by the second~the 4th filter capacitor C2, C3, C4, is responsible for carrying
For three road DC voltages of balance；Resistance bridge arm is responsible for capacitance bridge arm and carries out static state voltage equipoise；It is inverse that IGBT bridge arms are responsible for DC-AC
Become, three road DC voltages of resistance bridge arm after static state voltage equipoise are reverse into inspection galvanic electricity pressure；First contravariant transformer Tr2 and second is inverse
Become transformer Tr3 to be connected with capacitance bridge arm, IGBT bridge arms, play buffer action, meanwhile, electric energy is transmitted by electromagnetic induction；
During the balancer-transformer Tr1 primary and secondary side energy transmissions, the second vice-side winding N11 passes through the 3rd diode D3
It is connected to the both ends of the 3rd filter capacitor C3；First vice-side winding N12 is connected to the second filter capacitor by the second diode D2
The both ends of C2；3rd vice-side winding N13 is connected to the both ends of the 4th filter capacitor C4 by the 3rd diode D4, is the second~the
Four filter capacitor C2, C3, C4 are pressed.
Preferably, the equalizer circuit further includes the first power MOSFET S1, the first filter capacitor C1, first resistor
R1, the 23rd resistance R23, the first diode D1, wherein：
First resistor R1 one end and first filter capacitor C1 one end, balancer-transformer Tr1 primary side windings Same Name of Ends and straight
Stream anode is connected, and the first resistor R1 other ends are connected with the first filter capacitor C1 other ends and the first diode D1 cathodes；
First diode D1 anodes are connected with the drain electrode of balancer-transformer Tr1 non-same polarities, the first power MOSFET S1,
The drain electrode of first power MOSFET S1 is connected with one end of the 23rd resistance, the other end of the 23rd resistance with it is straight
Stream cathode is connected；
Balancer-transformer Tr1 the first vice-side winding N12 Same Name of Ends by the second diode D2 and the second filter capacitor C2 just
Pole is connected with direct-flow positive pole, and non-same polarity is connected with the second filter capacitor C2 cathode；
Balancer-transformer Tr1 the second vice-side winding N11 Same Name of Ends by the 3rd diode D3 and the 3rd filter capacitor C3 just
Extremely it is connected, non-same polarity is connected with the 3rd filter capacitor C3 cathode；
The 3rd vice-side winding N13 Same Name of Ends of balancer-transformer Tr1 by the 4th diode D4 and the 4th filter capacitor C4 just
Extremely it is connected, non-same polarity is connected with the second filter capacitor C2 cathode.
It is highly preferred that the first~the 3rd vice-side winding N12, N11, N13 number of turn of the balancer-transformer Tr1 is identical,
For 1/3rd of the primary side winding P1 numbers of turn.
Preferably, the capacitance bridge arm is followed in series to form by the filter capacitor C4 of the second filter capacitor C2~the 4th；
The resistance bridge arm is followed in series to form by the equalizing resistance R4 of the second equalizing resistance R2~the 4th；
The IGBT bridge arms are sequentially connected by the IGBT S4 of the 2nd IGBT S2~the 4th and formed；
Wherein：
Direct-flow positive pole and the second filter capacitor C2 anodes, second equalizing resistance R2 one end and the 2nd IGBT S2 drain electrode phase
Even；
Direct current cathode and the 4th filter capacitor C4 cathode, the 4th equalizing resistance R4 one end and the 4th IGBT S4 source electrode phases
Even；
Second filter capacitor C2 cathode are pressed with the 3rd filter capacitor C3 anodes, the second equalizing resistance R2 other ends, the 3rd
Resistance R3 one end and the first contravariant transformer Tr2 primary side winding non-same polarities are connected；
3rd filter capacitor C3 cathode are pressed with the 4th filter capacitor C4 anodes, the 3rd equalizing resistance R3 other ends, the 4th
The resistance R4 other ends and the second contravariant transformer Tr3 primary side winding non-same polarities are connected；
2nd IGBT S2 source electrodes drain with the 3rd IGBT S3 and the first contravariant transformer Tr2 primary side winding Same Name of Ends phases
Even；
3rd IGBT S3 source electrodes drain with the 4th IGBT S4 and the second contravariant transformer Tr3 primary side winding Same Name of Ends phases
Even；
Output cathode is connected with the first contravariant transformer Tr2 vice-side winding Same Name of Ends；Output negative pole and the second inversion transformation
Device Tr3 vice-side winding non-same polarities are connected；First contravariant transformer Tr2 vice-side windings non-same polarity and the second contravariant transformer
Tr3 vice-side winding Same Name of Ends is connected.
It is highly preferred that with one or more of feature：
The capacitance of the filter capacitor C4 of-the second filter capacitor C2~the 4th is identical；
The resistance value of the equalizing resistance R4 of-the first equalizing resistance R2~the 4th is equal.
Second purpose according to the present invention provides a kind of control circuit of capacitance series connection automatically equalizing voltage circuit, the control
Circuit includes pressure measurement circuit, peripheral circuit and analog circuit, wherein：
The pressure measurement circuit for detecting DC voltage, is acted on by the 7th~the 8th divider resistance R7, R8, obtained
One voltage signal, and the 4th filter capacitor C4 terminal voltages in power circuit are detected, it obtains by the 5th~the 6th divider resistance
R5, R6 are acted on, and obtain another voltage signal, input of the two voltage signals as peripheral circuit；
The peripheral circuit, two voltage signals for being obtained to pressure measurement circuit are compared processing, by treated
Signal feeds back in the analog circuit feed back input port for controlling chip；
The control chip for coming from each signal of analog circuit, obtains drive pulse signal after treatment, control
The on off state of power device in power circuit.
Preferably, the pressure measurement circuit includes the divider resistance R8 of the 5th divider resistance R5~the 8th, the 5th partial pressure electricity
The 4th filter capacitor C4 both ends being connected in parallel on after resistance R5, the 6th divider resistance R6 series connection in power circuit；Described 7th point
Piezoresistance R7 connects with the 8th divider resistance R8 and is followed by between direct-flow positive pole and direct current negative terminal.
Preferably, the divider resistance R8 of the 5th divider resistance R5~the 8th has R6/(R5+R6)=3R8/(R7+R8) pass
It is that each parameter is the resistance value of corresponding resistance in formula.
Preferably, the peripheral circuit includes the resistance R19 and the first operational amplifier U1 of the 9th resistance R9~the 19th
~the three operational amplifier U3, wherein：
9th resistance R9 one end is connected with the first detection voltage u1, the other end and the first operational amplifier U1 reverse input ends
It is connected；Tenth resistance R10 one end is connected with the second detection voltage u2, the other end and the first operational amplifier U1 positive input phases
Even；11st resistance R11 one end is connected with the first operational amplifier U1 positive inputs, other end ground connection；12nd resistance R12
One end is connected with the second detection voltage u2, and the other end is connected with second operational amplifier U2 reverse input ends；
13rd resistance R13 one end is connected with the first detection voltage u1, and the other end and second operational amplifier U2 forward directions are defeated
Enter end to be connected；14th resistance R14 one end is connected with second operational amplifier U2 positive inputs, other end ground connection；15th
Resistance R15 one end is connected with the first operational amplifier U1 output terminals, the other end and the 3rd operational amplifier U3 reverse input end phases
Even；
16th resistance R16 one end is connected with second operational amplifier U2 output terminals, the other end and the 3rd operational amplifier
U3 positive inputs are connected；17th resistance R17 one end is connected with the 3rd operational amplifier U3 positive inputs, another termination
Ground；18th resistance R18 one end is connected with the 3rd operational amplifier U3 reverse input ends, other end ground connection；19th resistance R19
One end is connected with the 3rd operational amplifier U3 reverse input ends, after the other end is connected with the 3rd operational amplifier U3 output terminals, with
The 3rd pin FB of feedback input end of control chip is connected.
Preferably, the analog circuit includes control chip, the first Transient Suppression Diode TVS1 and the 20th resistance
The resistance R27 of R20~the 27th, wherein：
First pin VDD of control chip is connected with+15V working powers, the 20th resistance R20 one end and+15V work electricity
Source is connected, and the other end is with controlling the voltage detecting input terminal second pin VS of chip, one end of the 21st resistance R21 to be connected；
The 21st resistance R21 other ends are grounded；22nd resistance R22 one end and the 6th pin of drive output mouth of control chip
DRV is connected, and the other end is connected with the first power MOSFET S1 grids in power circuit；23rd resistance R23 one end and work(
The first power MOSFET S1 source electrodes, the 5th pin CS of control chip in rate circuit are connected, other end ground connection；24th
Resistance R24 one end and the 8th pin HV phases of high input voltage port of the first Transient Suppression Diode TVS1 anodes and control chip
Even, the resistance R27 of the other end and the 25th resistance R25~the 27th is grounded after being sequentially connected in series；25th resistance R25,
26 resistance R26, the 27th resistance R27 head and the tail are sequentially connected in series；Control the bias supply input port VDD and+15V of chip
Working power is connected, and ground connection the 4th pin GND of input port is connected with ground terminal.
Compared with prior art, the invention has the advantages that：
Equalizer circuit of the present invention can play automatically equalizing voltage effect to multiple filter capacitor tandem energies, and voltage equalizing is good.
Control circuit of the present invention is using drive control of the control chip as power device MOSFET, the filtering that will be detected
Capacitance voltage is handled by peripheral circuit, obtains control signal, is input to control chip, so as to control power device
On off state, on or off so that balancer-transformer works automatically, and Pressure and Control are realized for filter capacitor.Specifically, press
Transformer secondary umber of turn is 1/3rd of the primary side winding number of turn, when power device MOSFET is turned on, the filtered electrical of series connection
Hold and power simultaneously for the primary side winding of balancer-transformer, be in discharge condition, the high filter capacitor electric discharge of terminal voltage is more, end
The low filter capacitor electric discharge of voltage is less, the storage of balancer-transformer primary side.When power device MOSFET is turned off, balancer-transformer
Secondary charges for the low filter capacitor of rear class terminal voltage, and the high filter capacitor of terminal voltage cannot charge.By power device
The continuous break-make work of MOSFET, the terminal voltage of series filtering capacitance tend to consistent.As long as two-way detection voltage is inclined there are voltage
Difference, control chip will control power device to work.As long as power device works, each filter capacitor will automatically equalizing voltage.
Description of the drawings
Upon reading the detailed description of non-limiting embodiments with reference to the following drawings, other feature of the invention,
Objects and advantages will become more apparent upon：
Fig. 1 is the automatically equalizing voltage circuit and its electric operation control circuit figure of one embodiment of the invention；
In figure：Power circuit 1, equalizer circuit 11, inverter circuit 12；Control circuit 2, pressure measurement circuit 21, analog circuit 22,
Peripheral circuit 23.
Specific embodiment
With reference to specific embodiment, the present invention is described in detail.Following embodiment will be helpful to the technology of this field
Personnel further understand the present invention, but the invention is not limited in any way.It should be pointed out that the ordinary skill to this field
For personnel, without departing from the inventive concept of the premise, various modifications and improvements can be made.These belong to the present invention
Protection domain.
As shown in Figure 1, a kind of capacitance series connection automatically equalizing voltage circuit, including power circuit 1；The power circuit 1 includes equal
Volt circuit 11 and inverter circuit 12, wherein：
The secondary of balancer-transformer Tr1 is set there are three vice-side winding N11, N12, N13 and three two in the equalizer circuit 1
Pole pipe D2, D3, D4；
The inverter circuit 2 by capacitance bridge arm (C2, C3, C4), resistance bridge arm (R2, R3, R4), IGBT bridge arms (S2, S3,
S4), the first contravariant transformer Tr2 and the second contravariant transformer Tr3 compositions, wherein：Capacitance bridge arm for three electrolytic capacitor C2,
C3, C4 series arm are responsible for providing three road DC voltages of balance；Resistance bridge arm is responsible for capacitance bridge arm and carries out static state voltage equipoise；
IGBT bridge arms are responsible for DC-AC inversions；First contravariant transformer Tr2 and the second contravariant transformer Tr3 play buffer action, secondary string
Any type of rectifier is connected after connection.
Further, the capacitance bridge arm is made of filter capacitor C2, C3, C4 component, their connection modes is sequentially
Series connection, i.e., the anode of filter capacitor C2 is connected with direct-flow positive pole DCP, and cathode is connected with the anode of filter capacitor C3, filtered electrical
The cathode for holding C3 is connected with the anode of filter capacitor C4, and the cathode of filter capacitor C4 is connected with direct current cathode DCN, and capacitance bridge arm is used
It is rear class power device IGBT S2, S3, S4 together with contravariant transformer Tr2 and Tr3 structure in generating equal tri- road DC voltages of Ya
Into inverter circuit provide DC power supply；
Further, the resistance bridge arm is made of R2, R3, R4 component, their connection modes is in sequential series, i.e. electricity
One end of resistance R2 is connected with direct-flow positive pole DCP, and the other end is connected with one end of resistance R3, the other end and the resistance R4 of resistance R3
One end be connected, the other end of resistance R4 is connected with direct current cathode DCN, while in structure, resistance R2 is in parallel with capacitance C2, electricity
Resistance R3 is in parallel with capacitance C3, and resistance R4 is in parallel with capacitance C4, and resistance bridge arm is used for the static state voltage equipoise of filter capacitor C2, C3, C4；
Further, the IGBT bridge arms are made of power device IGBT S2, S3, S4 component, their connection modes are
In sequential series, i.e., the collector of IGBT S2 is connected with direct-flow positive pole DCP, and emitter is connected with the collector of IGBT S3,
The emitter of IGBT S3 is connected with the collector of IGBT S4, and the emitter of IGBT S4 is connected with direct current cathode DCN, IGBT bridges
The three road DC voltages for pressing post filtering capacitance C2, C3, C4 are reverse into inspection galvanic electricity pressure by arm, so as to contravariant transformer Tr2 and Tr3
By electromagnetic induction, electric energy is transmitted.
Further, when the first balancer-transformer Tr1 primary sides P1 is with vice-side winding N12, N11, N13 energy transmission,
Three described vice-side winding N12, N11, N13 are connected to the filter capacitor of the capacitance bridge arm by diode D2, D3, D4 respectively
The both ends of C2, C3, C4 are the pressure of described filter capacitor C2, C3, C4.
The equalizer circuit includes the first power MOSFET S1, the first filter capacitor C1, first resistor R1, the 23rd
The diode D4 and balancer-transformer Tr1 of resistance R23, the first diode D1~the 4th, including a primary side winding P1 and three
Vice-side winding N12, N11, N13, wherein：
First resistor R1 one end and first filter capacitor C1 one end, balancer-transformer Tr1 primary side windings Same Name of Ends and straight
Stream anode DCP is connected, and the first resistor R1 other ends are connected with the first filter capacitor C1 other ends and the first diode D1 cathodes；
First diode D1 anodes are connected with the drain electrode of balancer-transformer Tr1 non-same polarities, the first power MOSFET S1,
The drain electrode of first power MOSFET S1 is connected with one end of the 23rd resistance R23, and the 23rd resistance R23's is another
End is connected with direct current cathode DCN；
Balancer-transformer Tr1 the first vice-side winding N12 Same Name of Ends by the second diode D2 and the second filter capacitor C2 just
Pole is connected with direct-flow positive pole DCP, and non-same polarity is connected with the second filter capacitor C2 cathode；
Balancer-transformer Tr1 the second vice-side winding N11 Same Name of Ends by the 3rd diode D3 and the 3rd filter capacitor C3 just
Extremely it is connected, non-same polarity is connected with the 3rd filter capacitor C3 cathode；
The 3rd vice-side winding N13 Same Name of Ends of balancer-transformer Tr1 by the 4th diode D4 and the 4th filter capacitor C4 just
Extremely it is connected, non-same polarity is connected with the second filter capacitor C2 cathode.
Vice-side winding N11~N13 numbers of turn of the balancer-transformer Tr1 are identical, are three points of the primary side winding P1 numbers of turn
One of.
The inverter circuit includes the filter capacitor C4 of the second filter capacitor C2~the 4th, the second equalizing resistance R2~4
The primary side of equalizing resistance R4, primary side winding and the vice-side winding of the first contravariant transformer Tr2 and the second contravariant transformer Tr3 around
Group and vice-side winding, wherein：
Direct-flow positive pole DCP and the second filter capacitor C2 anodes, second equalizing resistance R2 one end and the 2nd IGBT S2 drain
It is connected；
Direct current cathode DCN and the 4th filter capacitor C4 cathode, the 4th equalizing resistance R4 one end and the 4th IGBT S4 source electrodes
It is connected；
Second filter capacitor C2 cathode are pressed with the 3rd filter capacitor C3 anodes, the second equalizing resistance R2 other ends, the 3rd
Resistance R3 one end and the first contravariant transformer Tr2 primary side winding non-same polarities are connected；
3rd filter capacitor C3 cathode are pressed with the 4th filter capacitor C4 anodes, the 3rd equalizing resistance R3 other ends, the 4th
The resistance R4 other ends and the second contravariant transformer Tr3 primary side winding non-same polarities are connected；
2nd IGBT S2 source electrodes drain with the 3rd IGBT and the first contravariant transformer Tr2 primary side winding Same Name of Ends is connected；
3rd IGBT S3 source electrodes drain with the 4th IGBT S4 and the second contravariant transformer Tr3 primary side winding Same Name of Ends phases
Even；
Output cathode DCP is connected with the first contravariant transformer Tr2 vice-side winding Same Name of Ends；Output negative pole DCN and second is inverse
Become transformer Tr3 vice-side winding non-same polarities to be connected；First contravariant transformer Tr2 vice-side windings non-same polarity and the second inversion become
Depressor Tr3 vice-side winding Same Name of Ends is connected.
In a further embodiment, the control circuit of above-mentioned capacitance series connection automatically equalizing voltage circuit, the control circuit 2 include
Pressure measurement circuit 21, analog circuit 22 and peripheral circuit 23, wherein：
The pressure measurement circuit 21 for detecting DC voltage, acts on by divider resistance R7, R8, obtains a voltage
Signal；And filter capacitor C4 terminal voltages in power circuit are detected, it is acted on by divider resistance (R5, R6), obtains another voltage
Signal；Input of the two voltage signals as peripheral circuit 23；
The peripheral circuit 23, two voltage signals for being obtained to pressure measurement circuit are compared processing, after processing
Signal feed back in the analog circuit 22 control chip feed back input port FB；
Control chip in the analog circuit 22, for detect each input port (VDD, VS, FB, GND, CS, DRV,
HV signal) obtains drive pulse signal after treatment, controls the on off state of power device S1 in power circuit 1.
In the control circuit of the capacitance series connection automatically equalizing voltage circuit, the pressure measurement circuit 21 includes the 5th divider resistance
Power circuit is connected in parallel on after R5~the 8th divider resistance R8, the 5th divider resistance R5, the 6th divider resistance R6 series connection
In the 4th filter capacitor C4 both ends；The 7th divider resistance R7 connects with the 8th divider resistance R8 to be followed by direct current just
Between pole DCP and direct current negative terminal DCN.
In the control circuit of the capacitance series connection automatically equalizing voltage circuit, the 5th divider resistance R5~the 8th partial pressure is electric
Resistance R8 has R6/(R5+R6)=3R8/(R7+R8) relation, each parameter is the resistance value of corresponding resistance in formula.
In the control circuit of described capacitance series connection automatically equalizing voltage circuit, the peripheral circuit 23 include the 9th resistance R9~
The operational amplifier U3 of 19th resistance R19 and the first operational amplifier U1~the 3rd, wherein：
9th resistance R9 one end is connected with the first detection voltage u1, the other end and the first operational amplifier U1 reverse input ends
It is connected；Tenth resistance R10 one end is connected with the second detection voltage u2, the other end and the first operational amplifier U1 positive input phases
Even；11st resistance R11 one end is connected with the first operational amplifier U1 positive inputs, other end ground connection；12nd resistance R12
One end is connected with the second detection voltage u2, and the other end is connected with second operational amplifier U2 reverse input ends；
13rd resistance R13 one end is connected with the first detection voltage u1, and the other end and second operational amplifier U2 forward directions are defeated
Enter end to be connected；14th resistance R14 one end is connected with second operational amplifier U2 positive inputs, other end ground connection；15th
Resistance R15 one end is connected with the first operational amplifier U1 output terminals, the other end and the 3rd operational amplifier U3 reverse input end phases
Even；
16th resistance R16 one end is connected with second operational amplifier U2 output terminals, the other end and the 3rd operational amplifier
U3 positive inputs are connected；17th resistance R17 one end is connected with the 3rd operational amplifier U3 positive inputs, another termination
Ground；18th resistance R18 one end is connected with the 3rd operational amplifier U3 reverse input ends, other end ground connection；19th resistance R19
One end is connected with the 3rd operational amplifier U3 reverse input ends, after the other end is connected with the 3rd operational amplifier U3 output terminals, with
The 3rd pin FB of feedback input end of control chip is connected.
In the control circuit of described capacitance series connection automatically equalizing voltage circuit, the analog circuit 22 include control chip 22,
The resistance R27 of first Transient Suppression Diode TVS1 and the 20th resistance R20~the 27th, wherein：
First pin VDD of control chip 22 is connected with+15V working powers, and the 20th resistance R20 one end works with+15V
Power supply is connected, the other end and the voltage detecting input terminal second pin VS of control chip, one end phase of the 21st resistance R21
Even；The 21st resistance R21 other ends are grounded；22nd resistance R22 one end and the drive output mouth the 6th of control chip
Pin DRV is connected, and the other end is connected with the first power MOSFET S1 grids in power circuit；23rd resistance R23 one end
It is connected with the first power MOSFET S1 source electrodes, the 5th pin CS of control chip in power circuit, other end ground connection；Second
14 resistance R24 one end and the first Transient Suppression Diode TVS1 anodes and the 8th pin of high input voltage port of control chip
HV is connected, and the resistance R27 of the other end and the 25th resistance R25~the 27th is grounded after being sequentially connected in series；25th resistance
R25, the 26th resistance R26, the 27th resistance R27 head and the tail are sequentially connected in series；Control the bias supply input port VDD of chip
It is connected with+15V working powers, ground connection the 4th pin GND of input port is connected with ground terminal.
Further, in the preferred embodiment of part, as shown in Figure 1, the pressure measurement circuit includes the 5th divider resistance R5
~the eight divider resistance R8；5th divider resistance R5 is connected in parallel in power circuit with the 6th divider resistance R6 after connecting
Four filter capacitor C4 both ends；7th divider resistance R7 connects with the 8th divider resistance R8 to be followed by between direct-flow positive pole and negative terminal.
The peripheral circuit includes the fortune of the resistance R19 and the first operational amplifier U1 of the 9th resistance R9~the 19th~3rd
Amplifier U3 is calculated, wherein：9th resistance R9 one end is connected with the first detection voltage, and the other end and the first operational amplifier U1 are reversed
Input terminal is connected；Tenth resistance R10 one end is connected with the second detection voltage, the other end and the positive inputs of the first operational amplifier U1
End is connected；11st resistance R11 one end is connected with the first operational amplifier U1 positive inputs, other end ground connection；12nd electricity
Resistance R12 one end is connected with the second detection voltage, and the other end is connected with second operational amplifier U2 reverse input ends；13rd resistance
R13 one end is connected with the first detection voltage, and the other end is connected with second operational amplifier U2 positive inputs；14th resistance
R14 one end is connected with second operational amplifier U2 positive inputs, other end ground connection；15th resistance R15 one end and the first fortune
It calculates amplifier U1 output terminals to be connected, the other end is connected with the 3rd operational amplifier U3 reverse input ends；16th resistance R16 one end
It is connected with second operational amplifier U2 output terminals, the other end is connected with the 3rd operational amplifier U3 positive inputs；17th electricity
Resistance R17 one end is connected with the 3rd operational amplifier U3 positive inputs, other end ground connection；18th resistance R18 one end and the 3rd
Operational amplifier U3 reverse input ends are connected, other end ground connection；19th resistance R19 one end and the 3rd operational amplifier U3 are reversed
Input terminal is connected, and the other end is connected with the 3rd operational amplifier U3 output terminals.
The analog circuit includes control chip, the first Transient Suppression Diode TVS1 and the 20th resistance R20~the
27 resistance R27, wherein：20th resistance R20 one end is connected with additional power source anode, the voltage of the other end and control chip
Detection input VS is connected；21st resistance R21 one end is with controlling the voltage detecting input terminal VS of chip to be connected, another termination
Ground；22nd resistance R22 one end is with controlling the drive output mouth DRV of chip to be connected, and the in the other end and power circuit
One power MOSFET S1 grids are connected；23rd resistance R23 one end and the first power MOSFET S1 sources in power circuit
Extremely it is connected, other end ground connection；24th resistance R24 one end and the first Transient Suppression Diode TVS1 anodes and control chip
High input voltage port HV be connected, the resistance R27 of the other end and the 25th resistance R25~the 27th is grounded after connecting；Second
15 resistance R25, the 26th resistance R26, the 27th resistance R27 head and the tail are sequentially connected in series；The bias supply for controlling chip is defeated
Inbound port VDD is connected with external power supply anode, and ground connection input port GND is connected with ground terminal.
In the above embodiment of the present invention, the capacitance of three filter capacitor C2~C4 of inverter circuit is identical in power circuit,
The resistance value of first~the 4th equalizing resistance R2~R4 is equal, and vice-side winding N11~N13 numbers of turn of balancer-transformer Tr1 are identical,
For 1/3rd times of the primary side winding P1 numbers of turn.The divider resistance R8 of 5th divider resistance R5~the 8th has R6/(R5+R6)=3R8/
(R7+R8) relation.
For the clearer realization principle for illustrating the above embodiment of the present invention, there is voltage un-balance with the 4th filter capacitor C4
Situation is next, and the present invention will be further described.Chip is controlled in illustrating below using UCC28740, it is specific to quote connection referring to Fig. 1
It is shown.
For power circuit in normal work, the terminal voltage of three filter capacitor C2~C4 in power circuit is equal and is
ui/ 3, sampled voltage u1Value and sampled voltage u2Value it is equal, peripheral circuit output be zero, control chip UCC28740 do not have
Feedback input signal, output port DRV do not have signal output, and the first power MOSFET S1 do not have drive signal thus in pass
Disconnected state, balancer-transformer Tr1 circuits do not work.When causing the 4th filter capacitor C4's due to capacitance or ohmic leakage etc.
Terminal voltage uC4Less than ui/ 3 and the terminal voltage of the second filter capacitor C2 and the 3rd filter capacitor C3C3 is all higher than uiWhen/3, sampling electricity
Press u1Value be less than sampled voltage u2Value, at this time the difference signal of sampled voltage transported by the processing the 3rd of peripheral circuit
It calculates amplifier U3 and exports a comparison signal to the feed back input port FB of control chip UCC28740；15V external power supply anodes
It is connected with the bias supply input terminal VDD for controlling chip UCC28740, and a voltage signal is obtained by divider resistance R21
The voltage detecting input terminal VS for being input to control chip UCC28740 is detected as overvoltage；Direct-flow positive pole voltage u1Pass through voltage-stabiliser tube
TVS1 is that the capacitance in VDD charges with the high input voltage port HV of chip UCC28740 is controlled to be connected；Control chip UCC28740
Current detecting port CS detections in real time flow through the electric current being grounded on reference resistance R23 connect with the first power MOSFET S1.
Grounding ports GND reliable grounds.Control chip UCC28740 is handled the signal of each input port so that output terminal
Mouth DRV exports a pulse drive signal and controls the first power MOSFET S1 conductings, and balancer-transformer Tr1 circuits are started to work,
Understand that the voltage of the 3rd vice-side winding N13 is u than relation by the primary and secondary side umber of turn of balancer-transformer Tr1i/ 3, so as to
Turn on the 4th diode D4, the 3rd vice-side winding N13 charges for the 4th filter capacitor C4 until the 4th filter capacitor C4 ends electricity
Pressure reaches ui/ 3, simultaneously because the sum of three filter capacitor terminal voltages in power circuit are consistently equal to ui, the second filter capacitor C2
By electric discharge terminal voltage is made to drop to u with the 3rd filter capacitor C3C3i/ 3, so far power circuit reach normal operating conditions again,
Realize the automatically equalizing voltage of filter capacitor.
When filter capacitor is pressed, it is assumed that every capacitance voltage is uc, and rear class inverter circuit has following four switching group
It closes, operation principle is as follows：In (1) three IGBT S2~S4, when only IGBT S2 are turned on, contravariant transformer Tr2 primary sides are conductive,
The terminal voltage that the voltage of primary side application is positive filter capacitor C2, contravariant transformer Tr2 secondary induced voltages, if inversion transformation
Device Tr2 primary and secondary side equal turn numbers, final output voltage uo is+uo at this time；In (2) three IGBT S2~S4, only IGBT
When S4 is turned on, contravariant transformer Tr3 primary sides are conductive, and the voltage that primary side applies is the terminal voltage of the filter capacitor C4 born, and inversion becomes
Depressor Tr2 secondary induced voltages, if contravariant transformer Tr2 primary and secondary side equal turn numbers, at this time final output voltage uo for-
uo；In (3) three IGBT S2~S4, when only IGBT S2 are turned on S3, final output voltage uo is+3uo at this time；(4) three
In IGBT S2~S4, when only IGBT S3 are turned on S4, final output voltage uo is -3uo at this time；Therefore by reasonably
IGBT bridge arms are controlled, accept or reject different switch combinations, it is possible to alternating voltage is obtained in the secondary of two contravariant transformers, after being
Grade AC load power supply.After alternating voltage is followed by rectifier, DC voltage can also be obtained, is powered for rear class DC load, such as
Plasma cutting machine loads.IGBT S3, which can also cancel, not to be had to, and can be eliminated two kinds of switch combinations, but not interfered with inversion
The work of circuit.
Since DC voltage presses the capacitance that well, can be saved contravariant transformer primary side winding and connect.
In a preferred embodiment, inverter type plasma cutting machine DC power supply, above-mentioned each component parameters may be selected as follows：
Power device MOSFET S1 switching frequencies：20kHz—50kHz；
Absorption resistance R1：3*47k Ω, for balancer-transformer primary side magnetic reset；
Equalizing resistance R2-R4：5.6k Ω/5W, for static state voltage equipoise；
Absorption Capacitance C1：4.70pF/3kV, for balancer-transformer primary side magnetic reset；
C2-C4：680 μ F/200V, filter capacitor provide three road DC voltages for inverter；
Schottky diode D1：1kV, 3A/85 DEG C, for balancer-transformer primary side magnetic reset；
D2-D4：600V, 5A/85 DEG C are that filter capacitor charges with balancer-transformer vice-side winding one direction；
Power device IGBT S1-S4：1200V, 25A/85 DEG C, for inverter；
Divider resistance：R5、R6：199k Ω and 1k Ω, for generating the voltage signal of filter capacitor C4；
Divider resistance：R7、R8：3*199k Ω and 3k Ω, for generating the voltage signal of entire DC loop；
Resistance R9-R19：2k Ω, for comparison circuit；
Divider resistance：R20 and R21：68k Ω and 22k Ω, for voltage detecting and limitation highest switching frequency；
Drive resistance R22：11 Ω, for the gate pole current limliting of driving power device MOSFET S1；
Shunt resistance R23：1.5 Ω, for detecting the electric current of power device MOSFET S1；
R24—R27：It is 300k Ω, for measuring DC loop voltage；
Transient Suppression Diode TVS1：200V, P4SMA200A, for measuring DC loop voltage；
Balancer-transformer Tr1：47kHz；
Contravariant transformer Tr2 and Tr3：10kHz~40kHz；
Control chip：UCC28740, inverse-excitation type switch power-supply controller；
Control circuit operational amplifier U1-U3：LM358, operational amplifier, as comparator；
DC power supply：+ 15.0V, working power.
To sum up, the present invention realizes that the filter capacitor in power circuit causes each filtering due to capacitance, ohmic leakage etc.
High frequency transformer circuit is controlled to realize the effect of automatically equalizing voltage for voltage un-balance filter capacitor when capacitance voltage is unbalanced, there is control
Simply, the characteristics of response quickly, voltage equalizing is good, can be applied in the practical applications such as semi-bridge inversion type plasma cutting machine.
Specific embodiments of the present invention are described above.It is to be appreciated that the invention is not limited in above-mentioned
Particular implementation, those skilled in the art can make various deformations or amendments within the scope of the claims, this not shadow
Ring the substantive content of the present invention.
Claims (10)
- The automatically equalizing voltage circuit 1. a kind of capacitance is connected, it is characterised in that including power circuit, the power circuit includes equal piezoelectricity Road and inverter circuit, wherein：The equalizer circuit equipped with balancer-transformer Tr1, the balancer-transformer Tr1 secondary be equipped with the first~the 3rd secondary around Group N12, N11, N13 and the second~the 4th diode D2, D3, D4；The inverter circuit is become by capacitance bridge arm, resistance bridge arm, IGBT bridge arms, the first contravariant transformer Tr2 and the second inversion Depressor Tr3 is formed, wherein：Capacitance bridge arm is sequentially connected in series by the second~the 4th filter capacitor C2, C3, C4, is responsible for providing flat Tri- road DC voltages of Heng；Resistance bridge arm is responsible for capacitance bridge arm and carries out static state voltage equipoise；IGBT bridge arms are responsible for DC-AC inversions, will Three road DC voltages of resistance bridge arm are reverse into inspection galvanic electricity pressure after static state voltage equipoise；First contravariant transformer Tr2 and the second inversion become Depressor Tr3 is connected with capacitance bridge arm, IGBT bridge arms, plays buffer action, meanwhile, electric energy is transmitted by electromagnetic induction；During the balancer-transformer Tr1 primary and secondary side energy transmissions, the second vice-side winding N11 passes through the 3rd diode D3 connections At the both ends of the 3rd filter capacitor C3；First vice-side winding N12 is connected to the second filter capacitor C2's by the second diode D2 Both ends；3rd vice-side winding N13 is connected to the both ends of the 4th filter capacitor C4 by the 3rd diode D4, for the second~the 4th filter Ripple capacitance C2, C3, C4 are pressed.
- The automatically equalizing voltage circuit 2. capacitance according to claim 1 is connected, it is characterised in that：The equalizer circuit further includes First power MOSFET S1, the first filter capacitor C1, first resistor R1, the 23rd resistance R23, the first diode D1, In：First resistor R1 one end and first filter capacitor C1 one end, balancer-transformer Tr1 primary side windings Same Name of Ends and direct current are just Extremely it is connected, the first resistor R1 other ends are connected with the first filter capacitor C1 other ends and the first diode D1 cathodes；First diode D1 anodes are connected with the drain electrode of balancer-transformer Tr1 non-same polarities, the first power MOSFET S1, and first The drain electrode of power MOSFET S1 is connected with one end of the 23rd resistance, and the other end of the 23rd resistance is born with direct current Extremely it is connected；Balancer-transformer Tr1 the first vice-side winding N12 Same Name of Ends by the second diode D2 and the second filter capacitor C2 anodes and Direct-flow positive pole is connected, and non-same polarity is connected with the second filter capacitor C2 cathode；Balancer-transformer Tr1 the second vice-side winding N11 Same Name of Ends passes through the 3rd diode D3 and the 3rd filter capacitor C3 anode phases Even, non-same polarity is connected with the 3rd filter capacitor C3 cathode；The 3rd vice-side winding N13 Same Name of Ends of balancer-transformer Tr1 passes through the 4th diode D4 and the 4th filter capacitor C4 anode phases Even, non-same polarity is connected with the second filter capacitor C2 cathode.
- 3. the control circuit of capacitance series connection automatically equalizing voltage circuit according to claim 2, it is characterised in that：The equal buckling The first of depressor Tr1~the 3rd vice-side winding N12, N11, N13 number of turn is identical, is 1/3rd of the primary side winding P1 numbers of turn.
- The automatically equalizing voltage circuit 4. capacitance according to claim 2 is connected, it is characterised in that：The capacitance bridge arm is followed in series to form by the filter capacitor C4 of the second filter capacitor C2~the 4th；The resistance bridge arm is followed in series to form by the equalizing resistance R4 of the second equalizing resistance R2~the 4th；The IGBT bridge arms are sequentially connected by the IGBT S4 of the 2nd IGBT S2~the 4th and formed；Wherein：Direct-flow positive pole is connected with the second filter capacitor C2 anodes, second equalizing resistance R2 one end and the 2nd IGBT S2 drain electrode；Direct current cathode is connected with the 4th filter capacitor C4 cathode, the 4th equalizing resistance R4 one end and the 4th IGBT S4 source electrodes；Second filter capacitor C2 cathode and the 3rd filter capacitor C3 anodes, the second equalizing resistance R2 other ends, the 3rd equalizing resistance R3 one end and the first contravariant transformer Tr2 primary side winding non-same polarities are connected；3rd filter capacitor C3 cathode and the 4th filter capacitor C4 anodes, the 3rd equalizing resistance R3 other ends, the 4th equalizing resistance The R4 other ends and the second contravariant transformer Tr3 primary side winding non-same polarities are connected；2nd IGBT S2 source electrodes drain with the 3rd IGBT S3 and the first contravariant transformer Tr2 primary side winding Same Name of Ends is connected；3rd IGBT S3 source electrodes drain with the 4th IGBT S4 and the second contravariant transformer Tr3 primary side winding Same Name of Ends is connected；Output cathode is connected with the first contravariant transformer Tr2 vice-side winding Same Name of Ends；Output negative pole and the second contravariant transformer Tr3 Vice-side winding non-same polarity is connected；First contravariant transformer Tr2 vice-side windings non-same polarity and the second contravariant transformer Tr3 secondary Motor Winding Same Name of Ends is connected.
- 5. the control circuit of capacitance series connection automatically equalizing voltage circuit according to claim 2, it is characterised in that：With with next Kind or various features：The capacitance of the filter capacitor C4 of-the second filter capacitor C2~the 4th is identical；The resistance value of the equalizing resistance R4 of-the first equalizing resistance R2~the 4th is equal.
- 6. a kind of control circuit of claim 1-5 any one of them capacitance series connection automatically equalizing voltage circuit, it is characterised in that：Institute Stating control circuit includes pressure measurement circuit, peripheral circuit and analog circuit, wherein：The pressure measurement circuit for detecting DC voltage, acts on by the 7th~the 8th divider resistance R7, R8, obtains one Voltage signal, and the 4th filter capacitor C4 terminal voltages in power circuit are detected, it obtains by the 5th~the 6th divider resistance R5, R6 Effect, obtains another voltage signal, input of the two voltage signals as peripheral circuit；The peripheral circuit, two voltage signals for being obtained to pressure measurement circuit are compared processing, will treated signal It feeds back in the analog circuit and controls the feed back input port of chip；The control chip for coming from each signal of analog circuit, obtains drive pulse signal, controls power after treatment The on off state of power device in circuit.
- 7. the control circuit of capacitance series connection automatically equalizing voltage circuit according to claim 6, it is characterised in that：The pressure measurement electricity Road includes the 5th divider resistance R5~the 8th divider resistance R8, the 5th divider resistance R5, the 6th divider resistance R6 string The 4th filter capacitor C4 both ends being connected in parallel on after connection in power circuit；The 7th divider resistance R7 and the 8th divider resistance R8 series connection is followed by between direct-flow positive pole and direct current negative terminal.
- 8. the control circuit of capacitance series connection automatically equalizing voltage circuit according to claim 7, it is characterised in that：Described 5th point The divider resistance R8 of piezoresistance R5~the 8th has R6/(R5+R6)=3R8/(R7+R8) relation, each parameter is corresponding electricity in formula The resistance value of resistance.
- 9. the control circuit of capacitance series connection automatically equalizing voltage circuit according to claim 6, it is characterised in that：The periphery electricity Road includes the operational amplifier U3 of the resistance R19 and the first operational amplifier U1 of the 9th resistance R9~the 19th~the 3rd, wherein：9th resistance R9 one end is connected with the first detection voltage u1, the other end and the first operational amplifier U1 reverse input end phases Even；Tenth resistance R10 one end is connected with the second detection voltage u2, the other end and the first operational amplifier U1 positive input phases Even；11st resistance R11 one end is connected with the first operational amplifier U1 positive inputs, other end ground connection；12nd resistance R12 One end is connected with the second detection voltage u2, and the other end is connected with second operational amplifier U2 reverse input ends；13rd resistance R13 one end is connected with the first detection voltage u1, the other end and second operational amplifier U2 positive inputs It is connected；14th resistance R14 one end is connected with second operational amplifier U2 positive inputs, other end ground connection；15th resistance R15 one end is connected with the first operational amplifier U1 output terminals, and the other end is connected with the 3rd operational amplifier U3 reverse input ends；16th resistance R16 one end is connected with second operational amplifier U2 output terminals, and the other end and the 3rd operational amplifier U3 are just It is connected to input terminal；17th resistance R17 one end is connected with the 3rd operational amplifier U3 positive inputs, other end ground connection；The 18 resistance R18 one end are connected with the 3rd operational amplifier U3 reverse input ends, other end ground connection；19th resistance R19 one end It is connected with the 3rd operational amplifier U3 reverse input ends, after the other end is connected with the 3rd operational amplifier U3 output terminals, with control The 3rd pin FB of feedback input end of chip is connected.
- 10. the control circuit for automatically equalizing voltage circuit of being connected according to claim 6-9 any one of them capacitance, it is characterised in that： It is electric that the analog circuit includes control chip, the first Transient Suppression Diode TVS1 and the 20th resistance R20~27th R27 is hindered, wherein：First pin VDD of control chip is connected with+15V working powers, the 20th resistance R20 one end and+15V working power phases Even, the other end is with controlling the voltage detecting input terminal second pin VS of chip, one end of the 21st resistance R21 to be connected；Second The 11 resistance R21 other ends are grounded；22nd resistance R22 one end and the 6th pin DRV of drive output mouth of control chip It is connected, the other end is connected with the first power MOSFET S1 grids in power circuit；23rd resistance R23 one end and power The first power MOSFET S1 source electrodes, the 5th pin CS of control chip in circuit are connected, other end ground connection；24th electricity Hinder R24 one end and the 8th pin HV phases of high input voltage port of the first Transient Suppression Diode TVS1 anodes and control chip Even, the resistance R27 of the other end and the 25th resistance R25~the 27th is grounded after being sequentially connected in series；25th resistance R25, 26 resistance R26, the 27th resistance R27 head and the tail are sequentially connected in series；Control the bias supply input port VDD and+15V of chip Working power is connected, and ground connection the 4th pin GND of input port is connected with ground terminal.
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| CN201711363883.2A CN108054940B (en) | 2017-12-18 | 2017-12-18 | Capacitor series automatic voltage-sharing circuit and control circuit thereof |
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| CN201711363883.2A CN108054940B (en) | 2017-12-18 | 2017-12-18 | Capacitor series automatic voltage-sharing circuit and control circuit thereof |
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| CN109149524A (en) * | 2018-09-20 | 2019-01-04 | 新誉轨道交通科技有限公司 | A kind of inverter protection system and inverter |
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