CN110336455A - A kind of current transformer soft starting circuit and starting method - Google Patents
A kind of current transformer soft starting circuit and starting method Download PDFInfo
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- CN110336455A CN110336455A CN201910590525.8A CN201910590525A CN110336455A CN 110336455 A CN110336455 A CN 110336455A CN 201910590525 A CN201910590525 A CN 201910590525A CN 110336455 A CN110336455 A CN 110336455A
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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
- H02M1/00—Details of apparatus for conversion
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
- H02M1/083—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the ignition at the zero crossing of the voltage or the current
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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
- H02M1/00—Details of apparatus for conversion
- H02M1/36—Means for starting or stopping converters
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Abstract
The embodiment of the invention discloses a kind of current transformer soft starting circuit and starting methods.The current transformer soft starting device includes the first charging module and the second charging module.Wherein, the first charging module includes first switch group, three-phase rectifier and DC capacitor, and three-phase current is rectified into direct current for controlling the three-phase rectifier the DC capacitor is charged to first voltage by the first switch group；Second charging module includes sequentially connected exchange input interface circuit, energy storage circuit and control switch group, the control switch group and energy storage circuit are connected with microprocessor, the microprocessor controls energy storage circuit according to first pulse-width control signal and DC capacitor is charged to second voltage for providing the first pulse-width control signal, the control switch group.Voltge surge is small in DC bus capacitor charge circuit when the embodiment of the present invention realizes current transformer soft start, and reduces the dash current in DC bus capacitor charge circuit.
Description
Technical field
The present embodiments relate to power electronic technique more particularly to a kind of current transformer soft starting circuit and starting methods.
Background technique
Rectifier as by electric energy from exchange become the power supply device of direct current be all in the application of all trades and professions must can not
Few.In nineteen seventies, someone starts PWM (Pulse Width Modulation, pulse width modulation) skill
Art introduces rectification domain variability and achieves good effect.It is rectified using PWM and can get unity power factor and sineization input electricity
Stream.Compared with phase control rectifier, demand of the PWM rectifier to capacitor, this kind of passive filtering element of reactor or energy-storage travelling wave tube is significantly
It reduces, dynamic property also improves a lot.
Currently, the soft Starting Technology for being generally applicable to current transformer is, will connect after three-phase or single phase ac alternating current series resistance
Three-phase uncontrollable rectifier bridge exchange end is connect, is charged after rectification for DC bus capacitor.After charging complete, make IGBT (Insulated
Gate Bipolar Transistor, insulated gate bipolar transistor) it is led according to the PWM logic of current transformer closed-loop control
Logical or cut-off, to reach pressure stabilizing purpose.
The method is DC bus capacitor charging using external three phase rectifier bridge rectification circuit, and charging voltage maximum value can only reach
To three-phase alternating-current supply phase voltageTimes, after opening IGBT, DC capacitor voltage non-impacting start can be made, but
Have very big dash current.
Summary of the invention
The embodiment of the present invention provides a kind of current transformer soft starting circuit and starting method, straight when realizing current transformer soft start
Lateral capacitance voltage is flowed without impact, and reduces dash current.
For this purpose, the embodiment of the invention provides a kind of current transformer soft starting circuit, the current transformer soft starting device
Including the first charging module and the second charging module, in which:
First charging module includes first switch group, three-phase rectifier and DC capacitor, and first switch group is for controlling three
Three-phase current is rectified into direct current so that DC capacitor is charged to first voltage by commutating phase device；Second charging module includes successively
Exchange input interface circuit, energy storage circuit and the control switch group of connection, control switch group are connected with energy storage circuit
There is microprocessor, microprocessor is for providing the first pulse-width control signal, and control switch group is according to the first pulse-width control signal control
DC capacitor is charged to second voltage by energy storage circuit processed.
Further, energy storage circuit includes being sequentially connected lc circuit and the first voltage inspection of exchange input interface circuit
Device is surveyed, lc circuit is used to detect the energy output voltage of lc circuit output end for storing electric energy, first voltage detection device.
Preferably, energy storage circuit further includes connecting the second voltage detection device of exchange input interface circuit, and second
Voltage check device is used to detect the energy input voltage of lc circuit input terminal.
Further, microprocessor provides the first pulse-width controlled according to the closed-loop control pulse width modulation logic of current transformer
Signal.
Further, control switch group includes the switch of the first phase half-bridge, the switch of the second phase half-bridge and third phase half
The switch of bridge.
Preferably, resistance is in series between first switch group and three-phase rectifier.
The embodiment of the invention also provides a kind of current transformer soft-start methods, this method comprises:
Closure first switch group makes three-phase current by three-phase rectifier, and three-phase current is rectified into direct current by three-phase rectifier
Electric current is once charged to DC capacitor；
The voltage of DC capacitor disconnects first switch group after reaching the first predeterminated voltage；
The switch conduction of control switch group or cut-off are controlled according to preset first pulse-width control signal, to straight
Galvanic electricity, which is held, carries out recharging.
After DC voltage recharging reaches the second preset voltage value, terminate soft start.Further, according to preset
One pulse-width control signal controls the switch conduction of control switch group or cut-off, to carry out recharging packet to DC capacitor
It includes:
The switch for controlling all control switch groups is in off state；
The first phase voltage zero passage point moment of three-phase alternating voltage is detected by first voltage detection device；
In the first time section that the first phase voltage zero passage point moment starts, the second phase half-bridge and third phase half-bridge are controlled
Switch be in off state, control switch conduction or the cut-off of the first phase half-bridge to carry out the two of the first stage to DC capacitor
Secondary charging.
Further, in the first time section that the first phase voltage zero passage point moment starts, control the second phase half-bridge and
The switch of third phase half-bridge is in off state, controls switch conduction or the cut-off of the first phase half-bridge to carry out the to DC capacitor
Include: after the recharging in one stage
The second phase voltage of three-phase alternating voltage zero passage point moment is detected by first voltage detection device；
In the second time interval that the second phase voltage zero passage point moment starts, the switch of control third phase half-bridge, which is in, to be cut
Only state controls switch conduction or the cut-off of the first phase half-bridge and the second phase half-bridge to carry out the two of second stage to DC capacitor
Secondary charging.
Further, in the second time interval that the second phase voltage zero passage point moment starts, control third phase half-bridge
Switch is in off state, controls switch conduction or the cut-off of the first phase half-bridge and the second phase half-bridge to carry out the to DC capacitor
Include: after the recharging of two-stage
Three-phase alternating voltage third phase voltage zero-cross point moment is detected by first voltage detection device；
In the third time interval that third phase voltage zero-cross point moment starts, the first phase half-bridge, the second phase half-bridge are controlled
With the switch conduction of third phase half-bridge or cut-off with the recharging to the DC capacitor progress phase III.
Present invention implementation use first switch group to control three-phase rectifier and three-phase current is rectified into direct current with by direct current
Capacitor is precharged to first voltage, controls energy according to the first pulse-width control signal that microprocessor provides using control switch group
DC capacitor is precharged to second voltage by storage circuit, completes the soft start-up process of current transformer, solves prior art unsteady flow
There are problems that very big dash current in device start-up course, it is electric in DC bus capacitor charge circuit when realizing current transformer soft start
Pressure impact is small, and reduces the dash current in DC bus capacitor charge circuit.
Detailed description of the invention
Fig. 1 is a kind of schematic diagram for current transformer soft starting circuit that the embodiment of the present invention one provides；
Fig. 2 is a kind of schematic diagram of current transformer soft starting circuit provided by Embodiment 2 of the present invention；
Fig. 3 is a kind of flow chart for current transformer soft-start method that the embodiment of the present invention three provides；
Fig. 4 is the specific flow chart of S300 in a kind of current transformer soft-start method of the offer of the embodiment of the present invention three.
Specific embodiment
The present invention is described in further detail with reference to the accompanying drawings and examples.It is understood that this place is retouched
The specific embodiment stated is used only for explaining the present invention rather than limiting the invention.It also should be noted that in order to just
Only the parts related to the present invention are shown in description, attached drawing rather than entire infrastructure.
In addition, term " first ", " second " etc. can be used to describe herein various directions, movement, step or element etc.,
But these directions, movement, step or element should not be limited by these terms.These terms are only used to by first direction, movement, step
Rapid or element and another direction, movement, step or element are distinguished.For example, the case where not departing from scope of the present application
Under, First Speed difference can be known as to second speed difference, and similarly, it is poor second speed difference can be known as First Speed
Value.First Speed difference and second speed difference both speed difference, but it is not same speed difference.Term " the
One ", " second " etc. cannot be understood as indicating or implying relative importance or implicitly indicate the quantity of indicated technical characteristic.
" first " is defined as a result, the feature of " second " can explicitly or implicitly include one or more feature.?
In description of the invention, the meaning of " plurality " is at least two, such as two, three etc., unless otherwise specifically defined.
Embodiment one
As shown in Figure 1, the embodiment of the present invention one provides a kind of current transformer soft starting circuit, including the first charging module and
Two charging modules.
Wherein, the first charging module includes first switch group 110, three-phase rectifier 120 and DC capacitor 130, and first opens
Three-phase current is rectified into direct current for controlling three-phase rectifier 120 DC capacitor 130 is charged to the first electricity by pass group 110
Pressure.Second charging module includes sequentially connected exchange input interface circuit 210, energy storage circuit 220 and control switch group
230, control switch group 230 and energy storage circuit 220 are connected with microprocessor 240, and microprocessor 240 is for providing the first arteries and veins
Width control signal, control switch group 230 control energy storage circuit 220 for DC capacitor 130 according to the first pulse-width control signal
Charge to second voltage.
Specifically, one end of first switch group 110 connects three-phase rectifier 120, other end connection exchange input interface electricity
Road 210, one end of three-phase rectifier 120 connect first switch group 110, and the other end connects DC capacitor 130, first switch group
110 are also connected to microprocessor 240.
In the present embodiment, after the power supply connection of exchange input interface circuit 210, microprocessor 240 controls first switch group
110 closures, exchange input interface circuit 210 provide three-phase current input three-phase rectifier 120 and energy storage circuit 220.Three
The three-phase current of input is rectified into direct current so that DC capacitor 130 is charged to first voltage, first voltage by commutating phase device 120
Maximum value can be for three-phase current voltage magnitudeTimes.The switch of control switch group 230 is normal off open state, and energy is deposited
Storage road 220 stores the three-phase current of input, and after microprocessor 240 generates the first pulse-width control signal, control is opened
Pass group 230 according to the first pulse-width control signal by logic of propositions enable control switch group 230 switch by preset order be connected or
Cut-off, the electric energy that energy storage circuit 220 stores at this time input direct-current capacitor 130 after the rectification of control switch group 230, directly
Second voltage is charged to DC capacitor 130, when second voltage value can work normally for the current transformer needed for driving load
Voltage value needed for driving load when voltage value or slightly below normal work, such as the high direct voltage of 300-500V, work as direct current
The voltage value for holding 130 both ends reaches second voltage value, completes the soft start of current transformer, then current transformer is in microprocessor 240
Three-phase alternating current is persistently converted to DC powered loaded work piece under control.
The present invention implementation use first switch group 110 control three-phase rectifier 120 by three-phase current be rectified into direct current with
DC capacitor 130 is precharged to first voltage, the first pulsewidth provided using control switch group 230 according to microprocessor 240
DC capacitor 130 is precharged to second voltage by control signal control energy storage circuit 220, completes the soft start mistake of current transformer
Journey solves the problems, such as there is very big dash current in prior art current transformer start-up course, when realizing current transformer soft start
Voltge surge is small in DC bus capacitor charge circuit, and reduces the dash current in DC bus capacitor charge circuit.
Embodiment two
As shown in Fig. 2, the embodiment of the present invention is second is that in the embodiment of the present invention one on the basis of current transformer soft starting circuit
The circuit is advanced optimized.
In the present embodiment, energy storage circuit 220 includes the lc circuit 221 and the of connection exchange input interface circuit 210
One voltage check device 222, lc circuit 221 is for storing electric energy, and first voltage detection device 222 is for detecting lc circuit 221
The energy output voltage of output end.
Preferably, energy storage circuit 220 further includes the second voltage detection device of connection exchange input interface circuit 210
223, for detecting the energy input voltage of 221 input terminal of lc circuit.
Further, microprocessor 240 provides the first pulsewidth according to the closed-loop control pulse width modulation logic of current transformer
Control signal.
Further, control switch group 230 includes the switch for being connected in parallel on 130 both ends the first phase half-bridge of DC capacitor, second
The switch of phase half-bridge and the switch of third phase half-bridge.
Preferably, resistance 140 is in series between first switch group 110 and three-phase rectifier 120.
Specifically, the switch of the first phase half-bridge includes the first phase half-bridge being linked in sequence between 130 both ends of DC capacitor
The switch of upper bridge arm 231 and the switch of the first phase half-bridge lower bridge arm 232, the switch and the first phase of bridge arm 231 on the first phase half-bridge
First bus of the node connection exchange input interface circuit 210 between the switch of half-bridge lower bridge arm 232, the second phase half-bridge
Switch includes the switch and the second phase half-bridge of bridge arm 233 on the second phase half-bridge being linked in sequence between 130 both ends of DC capacitor
The switch of lower bridge arm 234, the section on the second phase half-bridge between the switch of bridge arm 233 and the switch of the second phase half-bridge lower bridge arm 234
Second bus of point connection exchange input interface circuit 210, the switch of third phase half-bridge includes being linked in sequence in DC capacitor 130
The switch of the switch of bridge arm 235 and third phase half-bridge lower bridge arm 236 on third phase half-bridge between both ends, bridge on third phase half-bridge
The third that the switch of arm 235 exchanges input interface circuit 210 with the connection of the intermediate node of the switch of third phase half-bridge lower bridge arm 236 is female
Line, wherein each switch is that high-frequency IGBT is switched, each switch for control the diode of its affiliated half bridge arm with
Realize the on and off of electric current.
In the present embodiment, when microprocessor 240 generates first according to the closed-loop control pulse width modulation logic of current transformer
After pulse-width control signal and the second pulse-width control signal, control switch group 230 controls all according to first pulse-width control signal
The switch of control switch group 230 is in off state；First voltage detection device 222 is according to detection of preset sampling period three
First phase voltage zero passage point moment of phase alternating voltage；In the first time section that the first phase voltage zero passage point moment starts,
Control the switch of bridge arm 233 on the second phase half-bridge, the switch of the second phase half-bridge lower bridge arm 234, bridge arm 235 on third phase half-bridge
Switch and the switch of third phase half-bridge lower bridge arm 236 be in off state, the switch of bridge arm 231 and the on the first phase half-bridge of control
The switch of one phase half-bridge lower bridge arm 232 is with the frequency on and off of the first pulse-width control signal to carry out to DC capacitor 130
The recharging of first stage.Then the second phase voltage of three-phase alternating voltage zero passage is detected by first voltage detection device 222
Point moment, in the second time interval that the second phase voltage zero passage point moment starts, bridge arm 235 is opened on control third phase half-bridge
It closes and the switch of third phase half-bridge lower bridge arm 236 is in off state, control the switch of bridge arm 231, first on the first phase half-bridge
On the switch of phase half-bridge lower bridge arm 232, the second phase half-bridge the switch of bridge arm 233 and the switch of the second phase half-bridge lower bridge arm 234 with
The frequency on and off of first pulse-width control signal is with the recharging to the progress second stage of DC capacitor 130.Then lead to
It crosses first voltage detection device 222 and detects three-phase alternating voltage third phase voltage zero-cross point moment；In third phase voltage over zero
In the third time interval that moment starts, the switch of bridge arm 231 on the first phase half-bridge, the first phase half-bridge lower bridge arm 232 are controlled
Switch, the switch of bridge arm 233 on the second phase half-bridge, the switch of the second phase half-bridge lower bridge arm 234, bridge arm 235 on third phase half-bridge
Switch and third phase half-bridge lower bridge arm 236 switch with the frequency on and off of the first pulse-width control signal to direct current
Hold 130 rechargings for carrying out the phase III.Wherein, first time section, the second time interval and third time interval all belong to
In in the same AC voltage cycle.
Wherein, because lc circuit 221 can be such that specific frequency content in signal passes through, and greatly decay other frequencies at
Point, it is detected in the output end setting first voltage detection device 222 of lc circuit 221, and feed back to microprocessor 240 to adjust
Save the width parameter of the first pulse-width control signal of drive control switching group 230.In exchange input interface circuit 210 and lc circuit
The second voltage detection device 223 of the input voltage for detecting exchange input interface circuit 210 is also set up between 221, and
In order to detect the unstable constant voltage of input AC electricity in time, to adjust the first pulse-width controlled letter of drive control switching group 230
Number width parameter.
In the present embodiment, exchange input interface circuit 210 respectively includes three ac input ends, and first switch group 110 is wrapped
Three switches are included, each switch is connected between an ac input end and three-phase rectifier 120.Three-phase rectifier 120 can be with
It is the three-phase Half bridge rectifier circuit or three-phase bridge rectification circuit of multiple diode compositions.First switch group 110 and three phase rectifier
Resistance 140 is in series between device 120 will not mistake with the charging current for guaranteeing uncontrollable 3-phase power converter supply DC capacitor 130
Greatly.The present embodiment includes three resistance 140, is connected respectively between each switch and three-phase rectifier 120 of first switch group 110
There is a resistance 140.In addition, the closed-loop control pulse width modulation logic of current transformer is the prior art, the embodiment of the present invention is not
It repeats again.
Embodiment three
As shown in Figures 3 and 4, the embodiment of the present invention three provides a kind of current transformer soft start side on that basi of the above embodiments
Method, the method for the present embodiment are applied to the current transformer soft starting circuit of any of the above-described embodiment, this method comprises:
S100, closure first switch group make three-phase current by three-phase rectifier, and three-phase rectifier rectifies three-phase current
It is once charged for DC current to DC capacitor.
S200, DC capacitor voltage reach and disconnect first switch group after the first predeterminated voltage.The present embodiment first voltage
It can be three-phase current voltage magnitudeTimes.
S300, the switch conduction of control switch group or cut-off are controlled according to preset first pulse-width control signal,
To carry out recharging to DC capacitor.First pulse-width control signal of the present embodiment can according to the closed-loop control of current transformer into
Row pulse width adjusts DC capacitor.
After S400, DC voltage recharging reach the second preset voltage value, terminate soft start.
Specifically, S300, according to preset first pulse-width control signal to the switch conduction of control switch group or end into
Row control, to include: to DC capacitor progress recharging
S310, the switch for controlling all control switch groups are in off state.
S320, the first phase voltage zero passage point moment that three-phase alternating voltage is detected by first voltage detection device.
S330, in the first time section that the first phase voltage zero passage point moment starts, control the second phase half-bridge and third
The switch of phase half-bridge is in off state, controls switch conduction or the cut-off of the first phase half-bridge to carry out the first rank to DC capacitor
The recharging of section.
S340, the second phase voltage of three-phase alternating voltage zero passage point moment is detected by first voltage detection device.
S350, in the second time interval that the second phase voltage zero passage point moment starts, control third phase half-bridge switch
In off state, switch conduction or the cut-off of the first phase half-bridge and the second phase half-bridge are controlled to carry out second-order to DC capacitor
The recharging on or off of section.
S360, three-phase alternating voltage third phase voltage zero-cross point moment is detected by first voltage detection device.
S370, in the third time interval that third phase voltage zero-cross point moment starts, control the first phase half-bridge, the second phase
The switch conduction or cut-off of half-bridge and third phase half-bridge are with the recharging on or off to the DC capacitor progress phase III.
Wherein, first time section, the second time interval and third time interval belong to the same AC voltage cycle
It is interior.
Note that the above is only a better embodiment of the present invention and the applied technical principle.It will be appreciated by those skilled in the art that
The invention is not limited to the specific embodiments described herein, be able to carry out for a person skilled in the art it is various it is apparent variation,
It readjusts and substitutes without departing from protection scope of the present invention.Therefore, although being carried out by above embodiments to the present invention
It is described in further detail, but the present invention is not limited to the above embodiments only, without departing from the inventive concept, also
It may include more other equivalent embodiments, and the scope of the invention is determined by the scope of the appended claims.
Claims (10)
1. a kind of current transformer soft starting circuit characterized by comprising
First charging module, including first switch group, three-phase rectifier and DC capacitor, the first switch group is for controlling institute
It states three-phase rectifier and three-phase current is rectified into direct current so that the DC capacitor is charged to first voltage；
Second charging module, including sequentially connected exchange input interface circuit, energy storage circuit and control switch group, it is described
Control switch group and energy storage circuit are connected with microprocessor, and the microprocessor is used to provide the first pulse-width control signal,
The control switch group controls energy storage circuit according to first pulse-width control signal and DC capacitor is charged to the second electricity
Pressure.
2. a kind of device according to claim 1, which is characterized in that the energy storage circuit includes being sequentially connected exchange
The lc circuit and first voltage detection device of input interface circuit, the lc circuit is for storing electric energy, the first voltage inspection
Survey the energy output voltage that device is used to detect lc circuit output end.
3. a kind of device according to claim 2, which is characterized in that the energy storage circuit further includes that connection exchange is defeated
The second voltage detection device of incoming interface circuit, the energy that the second voltage detection device is used to detect lc circuit input terminal are defeated
Enter voltage.
4. a kind of device according to claim 1, which is characterized in that the microprocessor is according to the closed-loop control of current transformer
Pulse width modulation logic provides the first pulse-width control signal.
5. a kind of device according to claim 1, which is characterized in that the control switch group includes being connected in parallel on the direct current
Switch, the switch of the second phase half-bridge and the switch of third phase half-bridge of capacitor both ends the first phase half-bridge.
6. a kind of device according to claim 1, which is characterized in that gone here and there between the first switch group and three-phase rectifier
It is associated with resistance.
7. a kind of current transformer soft-start method characterized by comprising
Closure first switch group makes three-phase current by three-phase rectifier, and the three-phase current is rectified by the three-phase rectifier
DC current is once charged to DC capacitor；
The voltage of DC capacitor disconnects first switch group after reaching the first predeterminated voltage；
The switch conduction of control switch group or cut-off are controlled according to preset first pulse-width control signal, to direct current
Hold and carries out recharging.
After DC voltage recharging reaches the second preset voltage value, terminate soft start.
8. a kind of method according to claim 7, which is characterized in that described according to preset first pulse-width control signal pair
The switch conduction of control switch group or cut-off are controlled, and include: to carry out recharging to DC capacitor
The switch for controlling all control switch groups is in off state；
The first phase voltage zero passage point moment of three-phase alternating voltage is detected by first voltage detection device；
In the first time section that the first phase voltage zero passage point moment starts, the second phase half-bridge and third phase half-bridge are controlled
Switch be in off state, control switch conduction or the cut-off of the first phase half-bridge to carry out the two of the first stage to DC capacitor
Secondary charging.
9. a kind of method according to claim 8, which is characterized in that described to start in the first phase voltage zero passage point moment
In first time section, the switch for controlling the second phase half-bridge and third phase half-bridge is in off state, the first phase half-bridge of control
Switch conduction or cut-off include: after the recharging to carry out the first stage to DC capacitor
The second phase voltage of three-phase alternating voltage zero passage point moment is detected by the first voltage detection device；
In the second time interval that the second phase voltage zero passage point moment starts, at the switch that controls the third phase half-bridge
In off state, switch conduction or the cut-off of the first phase half-bridge and the second phase half-bridge are controlled to carry out second to DC capacitor
The recharging in stage.
10. a kind of method according to claim 9, which is characterized in that described to start in the second phase voltage zero passage point moment
The second time interval in, the switch for controlling the third phase half-bridge is in off state, controls the first phase half-bridge and the
The switch conduction of two-phase half-bridge or cut-off include: after the recharging to carry out second stage to DC capacitor
Three-phase alternating voltage third phase voltage zero-cross point moment is detected by the first voltage detection device；
In the third time interval that the third phase voltage zero-cross point moment starts, the first phase half-bridge, the second phase are controlled
The switch conduction or cut-off of half-bridge and third phase half-bridge are with the recharging to the DC capacitor progress phase III.
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| CN112152428A (en) * | 2020-09-30 | 2020-12-29 | 科华恒盛股份有限公司 | Three-phase thyristor control circuit |
| CN114280437A (en) * | 2021-12-27 | 2022-04-05 | 阳光电源股份有限公司 | Generator insulation detection device and method and wind power generation system |
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Cited By (5)
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| CN111564982A (en) * | 2020-06-01 | 2020-08-21 | 中车青岛四方车辆研究所有限公司 | Control method and device of three-phase four-quadrant rectifier |
| CN111564982B (en) * | 2020-06-01 | 2022-02-08 | 中车青岛四方车辆研究所有限公司 | Control method and device of three-phase four-quadrant rectifier |
| CN112152428A (en) * | 2020-09-30 | 2020-12-29 | 科华恒盛股份有限公司 | Three-phase thyristor control circuit |
| CN112152428B (en) * | 2020-09-30 | 2022-06-07 | 科华恒盛股份有限公司 | Three-phase thyristor control circuit |
| CN114280437A (en) * | 2021-12-27 | 2022-04-05 | 阳光电源股份有限公司 | Generator insulation detection device and method and wind power generation system |
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| CN110336455B (en) | 2021-10-08 |
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