CN110336455B - Converter soft start circuit and start method - Google Patents
Converter soft start circuit and start method Download PDFInfo
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- CN110336455B CN110336455B CN201910590525.8A CN201910590525A CN110336455B CN 110336455 B CN110336455 B CN 110336455B CN 201910590525 A CN201910590525 A CN 201910590525A CN 110336455 B CN110336455 B CN 110336455B
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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
Abstract
The embodiment of the invention discloses a converter soft start circuit and a start method. The converter soft starting device comprises a first charging module and a second charging module. The first charging module comprises a first switch group, a three-phase rectifier and a direct current capacitor, wherein the first switch group is used for controlling the three-phase rectifier to rectify three-phase current into direct current so as to charge the direct current capacitor to a first voltage; the second charging module comprises an alternating current input interface circuit, an energy storage circuit and a control switch group which are sequentially connected, the control switch group and the energy storage circuit are connected with a microprocessor, the microprocessor is used for providing a first pulse width control signal, and the control switch group controls the energy storage circuit to charge the direct current capacitor to a second voltage according to the first pulse width control signal. According to the embodiment of the invention, the voltage impact in the direct current side capacitor charging loop is small when the converter is in soft start, and the impact current in the direct current side capacitor charging loop is reduced.
Description
Technical Field
The embodiment of the invention relates to a power electronic technology, in particular to a converter soft start circuit and a start method.
Background
A rectifier is indispensable for various industrial applications as a power supply device for converting electric energy from ac to dc. In the seventies of the twentieth century, PWM (Pulse Width Modulation) technology was introduced into the field of rectification and achieved good results. Unity power factor and sinusoidal input current can be obtained using PWM rectification. Compared with phase-controlled rectification, the PWM rectifier greatly reduces the requirements on passive filter elements such as capacitors and reactors or energy storage elements, and the dynamic performance of the PWM rectifier is greatly improved.
At present, the soft start technology generally applied to the converter is to connect a three-phase or single-phase alternating current commercial power in series with a resistor and then connect the resistor with an alternating current end of a three-phase uncontrollable rectifier bridge, and charge a direct current side capacitor after rectification. After the charging is completed, an Insulated Gate Bipolar Transistor (IGBT) is turned on or off according to a PWM logic of the closed-loop control of the converter, so as to achieve the purpose of voltage stabilization.
The method charges the DC side capacitor by using an external three-phase rectifier bridge rectification circuit, and the maximum charging voltage can only reach the voltage of a three-phase AC power supply
After the IGBT is turned on, the direct-current side capacitor voltage can be started without impact, but a large impact current still exists.
Disclosure of Invention
The embodiment of the invention provides a converter soft start circuit and a converter soft start method, which aim to realize that the direct-current side capacitor voltage has no impact when the converter is in soft start and reduce impact current.
To achieve the object, an embodiment of the present invention provides a converter soft start circuit, which includes a first charging module and a second charging module, wherein:
the first charging module comprises a first switch group, a three-phase rectifier and a direct current capacitor, wherein the first switch group is used for controlling the three-phase rectifier to rectify three-phase current into direct current so as to charge the direct current capacitor to a first voltage; the second charging module comprises an alternating current input interface circuit, an energy storage circuit and a control switch group which are sequentially connected, the control switch group and the energy storage circuit are connected with a microprocessor, the microprocessor is used for providing a first pulse width control signal, and the control switch group controls the energy storage circuit to charge the direct current capacitor to a second voltage according to the first pulse width control signal.
Furthermore, the energy storage circuit comprises an LC circuit and a first voltage detection device which are sequentially connected with the AC input interface circuit, the LC circuit is used for storing electric energy, and the first voltage detection device is used for detecting energy output voltage at the output end of the LC circuit.
Preferably, the energy storage circuit further comprises a second voltage detection device connected to the ac input interface circuit, and the second voltage detection device is configured to detect the energy input voltage at the input end of the LC circuit.
Further, the microprocessor provides a first pulse width control signal based on the closed loop control pulse width modulation logic of the current transformer.
Further, the control switch set includes switches of a first phase half bridge, switches of a second phase half bridge, and switches of a third phase half bridge.
Preferably, a resistor is connected in series between the first switch group and the three-phase rectifier.
The embodiment of the invention also provides a converter soft start method, which comprises the following steps:
closing the first switch group to enable the three-phase current to pass through the three-phase rectifier, and rectifying the three-phase current into direct current by the three-phase rectifier to charge the direct current capacitor for the first time;
disconnecting the first switch group after the voltage of the direct current capacitor reaches a first preset voltage;
and controlling the on/off of the switch of the control switch group according to a preset first pulse width control signal so as to charge the direct-current capacitor for the second time.
And finishing the soft start after the secondary charging of the direct current voltage reaches a second preset voltage value. Further, controlling the on/off of the switch of the control switch group according to a preset first pulse width control signal to perform secondary charging on the dc capacitor includes:
controlling the switches of all the control switch groups to be in a cut-off state;
detecting a zero crossing point moment of a first phase voltage of the three-phase alternating-current voltage by a first voltage detection device;
and in a first time interval starting from the zero-crossing time of the first phase voltage, the switches of the second phase half bridge and the third phase half bridge are controlled to be in a cut-off state, and the switch of the first phase half bridge is controlled to be switched on or switched off so as to carry out first-stage secondary charging on the direct-current capacitor.
Further, in a first time interval starting from the zero-crossing time of the first phase voltage, controlling the switches of the second phase half-bridge and the third phase half-bridge to be in a cut-off state, and after controlling the switches of the first phase half-bridge to be turned on or off to perform the first-phase secondary charging on the dc capacitor, the method includes:
detecting the zero crossing point moment of the second phase voltage of the three-phase alternating voltage by a first voltage detection device;
and in a second time interval starting from the zero crossing point moment of the second phase voltage, controlling the switch of the third phase half bridge to be in a cut-off state, and controlling the switches of the first phase half bridge and the second phase half bridge to be switched on or switched off so as to carry out secondary charging on the direct-current capacitor in a second phase.
Further, in a second time interval starting from the zero-crossing point of the second phase voltage, controlling the switch of the third phase half bridge to be in a cut-off state, and controlling the switches of the first phase half bridge and the second phase half bridge to be turned on or off to perform second-stage secondary charging on the dc capacitor includes:
detecting the zero crossing point moment of the third phase voltage of the three-phase alternating voltage by using a first voltage detection device;
and in a third time interval beginning from the zero crossing point moment of the third phase voltage, controlling the switches of the first phase half bridge, the second phase half bridge and the third phase half bridge to be switched on or switched off so as to carry out secondary charging on the DC capacitor in a third phase.
The invention adopts the first switch group to control the three-phase rectifier to rectify the three-phase current into direct current so as to pre-charge the direct current capacitor to a first voltage, and adopts the control switch group to control the energy storage circuit to pre-charge the direct current capacitor to a second voltage according to a first pulse width control signal provided by the microprocessor, thereby completing the soft start process of the converter, solving the problem of large impact current in the start process of the converter in the prior art, realizing small voltage impact in a direct current side capacitor charging loop when the converter is in soft start, and reducing the impact current in the direct current side capacitor charging loop.
Drawings
Fig. 1 is a schematic diagram of a converter soft start circuit according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a converter soft start circuit according to a second embodiment of the present invention;
fig. 3 is a flowchart of a converter soft start method according to a third embodiment of the present invention;
fig. 4 is a specific flowchart of S300 in a converter soft start method according to a third embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Furthermore, the terms "first," "second," and the like may be used herein to describe various orientations, actions, steps, elements, or the like, but the orientations, actions, steps, or elements are not limited by these terms. These terms are only used to distinguish one direction, action, step or element from another direction, action, step or element. For example, a first speed difference may be referred to as a second speed difference, and similarly, a second speed difference may be referred to as a first speed difference, without departing from the scope of the present application. The first speed difference and the second speed difference are both speed differences, but they are not the same speed difference. The terms "first", "second", etc. are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
Example one
As shown in fig. 1, a soft start circuit of a converter according to an embodiment of the present invention includes a first charging module and a second charging module.
The first charging module includes a first switch set 110, a three-phase rectifier 120, and a dc capacitor 130, where the first switch set 110 is configured to control the three-phase rectifier 120 to rectify a three-phase current into a dc current so as to charge the dc capacitor 130 to a first voltage. The second charging module includes an ac input interface circuit 210, an energy storage circuit 220, and a control switch group 230, which are connected in sequence, the control switch group 230 and the energy storage circuit 220 are connected to a microprocessor 240, the microprocessor 240 is configured to provide a first pulse width control signal, and the control switch group 230 controls the energy storage circuit 220 to charge the dc capacitor 130 to a second voltage according to the first pulse width control signal.
Specifically, one end of the first switch group 110 is connected to the three-phase rectifier 120, the other end is connected to the ac input interface circuit 210, one end of the three-phase rectifier 120 is connected to the first switch group 110, the other end is connected to the dc capacitor 130, and the first switch group 110 is also connected to the microprocessor 240.
In this embodiment, after the power source of the ac input interface circuit 210 is connected, the microprocessor 240 controls the first switch set 110 to be closed, and the ac input interface circuit 210 provides a three-phase current to the three-phase rectifier 120 and the energy storage circuit 220. The three-phase rectifier 120 rectifies the input three-phase current into direct current to charge the direct current capacitor 130 to a first voltage, which may have a maximum value of the magnitude of the three-phase current voltage
And (4) doubling. Controlling the switch of the switch group 230 to be in a normally-off state, the energy storage circuit 220 stores the input three-phase current, after the microprocessor 240 generates the first pulse width control signal, the control switch group 230 enables the switches of the control switch group 230 to be turned on or off according to the preset logic according to the first pulse width control signal, at this time, the electric energy stored by the energy storage circuit 220 is rectified by the control switch group 230 and then input into the dc capacitor 130 until the dc capacitor 130 is charged to the second voltage, the second voltage value can be a voltage value required by driving the load when the converter normally works or a voltage value slightly lower than the voltage value required by driving the load when the converter normally works, such as a dc high voltage of 300-plus 500V, when the voltage value at two ends of the dc capacitor 130 reaches the second voltage value, the soft start of the converter is completed, and then the converter is in the microprocessor 2And 40, continuously converting the three-phase alternating current into direct current to drive the load to work.
According to the invention, the first switch group 110 is adopted to control the three-phase rectifier 120 to rectify the three-phase current into direct current so as to pre-charge the direct current capacitor 130 to the first voltage, the control switch group 230 is adopted to control the energy storage circuit 220 to pre-charge the direct current capacitor 130 to the second voltage according to the first pulse width control signal provided by the microprocessor 240, the soft start process of the converter is completed, the problem of large impact current in the start process of the converter in the prior art is solved, the voltage impact in a direct current side capacitor charging loop is small when the converter is in soft start, and the impact current in the direct current side capacitor charging loop is reduced.
Example two
As shown in fig. 2, the second embodiment of the present invention further optimizes the circuit based on the soft start circuit of the converter in the first embodiment of the present invention.
In this embodiment, the energy storage circuit 220 includes an LC circuit 221 connected to the ac input interface circuit 210, and a first voltage detection device 222, where the LC circuit 221 is used for storing electric energy, and the first voltage detection device 222 is used for detecting an energy output voltage at an output end of the LC circuit 221.
Preferably, the energy storage circuit 220 further comprises a second voltage detection device 223 connected to the ac input interface circuit 210 for detecting the energy input voltage at the input of the LC circuit 221.
Further, the microprocessor 240 provides a first pulse width control signal according to the closed loop control pulse width modulation logic of the current transformer.
Further, the control switch set 230 includes a switch of the first phase half bridge, a switch of the second phase half bridge, and a switch of the third phase half bridge connected in parallel across the dc capacitor 130.
Preferably, a resistor 140 is connected in series between the first switch group 110 and the three-phase rectifier 120.
Specifically, the switches of the first-phase half bridge include the switches of the first-phase half bridge upper arm 231 and the switches of the first-phase half bridge lower arm 232 which are sequentially connected between the two ends of the dc capacitor 130, the nodes between the switches of the first-phase half bridge upper arm 231 and the switches of the first-phase half bridge lower arm 232 are connected to the first bus of the ac input interface circuit 210, the switches of the second-phase half bridge include the switches of the second-phase half bridge upper arm 233 and the switches of the second-phase half bridge lower arm 234 which are sequentially connected between the two ends of the dc capacitor 130, the nodes between the switches of the second-phase half bridge upper arm 233 and the switches of the second-phase half bridge lower arm 234 are connected to the second bus of the ac input interface circuit 210, the switches of the third-phase half bridge include the switches of the third-phase half bridge upper arm 235 and the switches of the third-phase lower arm 236 which are sequentially connected between the two ends of the dc capacitor 130, and the nodes between the switches of the third-phase half bridge upper arm 235 and the third-phase half bridge lower arm 236 are connected to the ac input interface circuit And a third bus of the circuit 210, wherein each switch is a high-frequency IGBT switch, and each switch is used for controlling a diode of a half bridge arm to which the switch belongs so as to realize the on and off of current.
In this embodiment, after the microprocessor 240 generates the first pulse width control signal and the second pulse width control signal according to the closed-loop control pulse width modulation logic of the converter, the control switch group 230 controls the switches of all the control switch groups 230 to be in the off state according to the first pulse width control signal; the first voltage detection device 222 detects a zero-crossing point time of a first phase voltage of the three-phase alternating-current voltage according to a preset sampling period; in a first time interval from the first phase voltage zero-crossing point, the switch of the second-phase half-bridge upper arm 233, the switch of the second-phase half-bridge lower arm 234, the switch of the third-phase half-bridge upper arm 235, and the switch of the third-phase half-bridge lower arm 236 are controlled to be in the off state, and the switch of the first-phase half-bridge upper arm 231 and the switch of the first-phase half-bridge lower arm 232 are controlled to be turned on and off at the frequency of the first pulse width control signal to perform the first-stage secondary charging on the dc capacitor 130. Then, the first voltage detection device 222 detects a zero-crossing point time of the second phase voltage of the three-phase ac voltage, and in a second time interval from the zero-crossing point time of the second phase voltage, the switch of the third phase half-bridge upper arm 235 and the switch of the third phase half-bridge lower arm 236 are controlled to be in an off state, and the switch of the first phase half-bridge upper arm 231, the switch of the first phase half-bridge lower arm 232, the switch of the second phase half-bridge upper arm 233 and the switch of the second phase half-bridge lower arm 234 are controlled to be turned on and off at the frequency of the first pulse width control signal to perform second-stage secondary charging on the dc capacitor 130. Then, the zero crossing point moment of the third phase voltage of the three-phase alternating voltage is detected by the first voltage detection device 222; in a third time interval from the third phase voltage zero-crossing point, the switches of the first-phase half-bridge upper arm 231, the switches of the first-phase half-bridge lower arm 232, the switches of the second-phase half-bridge upper arm 233, the switches of the second-phase half-bridge lower arm 234, the switches of the third-phase half-bridge upper arm 235 and the switches of the third-phase half-bridge lower arm 236 are controlled to be turned on and off at the frequency of the first pulse width control signal to perform the third-phase secondary charging on the dc capacitor 130. And the first time interval, the second time interval and the third time interval all belong to the same alternating current voltage period.
Since the LC circuit 221 can pass a specific frequency component in the signal and greatly attenuate other frequency components, the first voltage detection device 222 is disposed at the output end of the LC circuit 221 for detection, and feeds back the detected voltage to the microprocessor 240 to adjust the pulse width parameter of the first pulse width control signal for driving the control switch set 230. A second voltage detection device 223 for detecting the input voltage of the ac input interface circuit 210 is further disposed between the ac input interface circuit 210 and the LC circuit 221, so as to detect the unstable voltage of the input ac power in time to adjust the pulse width parameter of the first pulse width control signal for driving the control switch group 230.
In this embodiment, the ac input interface circuit 210 includes three ac input terminals, and the first switch group 110 includes three switches, each of which is connected in series between one of the ac input terminals and the three-phase rectifier 120. The three-phase rectifier 120 may be a three-phase half-bridge rectifier circuit or a three-phase full-bridge rectifier circuit composed of a plurality of diodes. A resistor 140 is connected in series between the first switch set 110 and the three-phase rectifier 120 to ensure that the charging current supplied by the uncontrollable three-phase converter to the dc capacitor 130 is not too large. The present embodiment includes three resistors 140, and one resistor 140 is respectively connected in series between each switch of the first switch group 110 and the three-phase rectifier 120. In addition, the closed-loop control pulse width modulation logic of the converter is the prior art, and the embodiment of the invention is not described again.
EXAMPLE III
As shown in fig. 3 and fig. 4, a third embodiment of the present invention provides a converter soft-start method based on the above-mentioned embodiments, where the method of this embodiment is applied to the converter soft-start circuit of any of the above-mentioned embodiments, and the method includes:
s100, closing the first switch group to enable the three-phase current to pass through the three-phase rectifier, and rectifying the three-phase current into direct current by the three-phase rectifier to charge the direct current capacitor for the first time.
S200, the first switch group is disconnected after the voltage of the direct current capacitor reaches a first preset voltage. The first voltage may be three-phase current voltage amplitude
And (4) doubling.
And S300, controlling the on/off of the switch of the control switch group according to a preset first pulse width control signal so as to charge the direct-current capacitor for the second time. The first pulse width control signal of this embodiment may perform pulse width adjustment on the dc capacitor according to closed-loop control of the converter.
And S400, finishing the soft start after the secondary charging of the direct current voltage reaches a second preset voltage value.
Specifically, S300, controlling the switch of the control switch group to be turned on or off according to a preset first pulse width control signal, so as to perform secondary charging on the dc capacitor includes:
and S310, controlling the switches of all the control switch groups to be in a cut-off state.
And S320, detecting the zero crossing point time of the first phase voltage of the three-phase alternating current voltage through the first voltage detection device.
And S330, controlling the switches of the second phase half bridge and the third phase half bridge to be in a cut-off state in a first time interval beginning from the zero crossing point of the first phase voltage, and controlling the switch of the first phase half bridge to be switched on or switched off so as to perform first-stage secondary charging on the direct-current capacitor.
And S340, detecting the zero crossing point moment of the second phase voltage of the three-phase alternating current voltage by the first voltage detection device.
And S350, in a second time interval beginning from the zero crossing point moment of the second phase voltage, controlling the switch of the third phase half bridge to be in a cut-off state, and controlling the switches of the first phase half bridge and the second phase half bridge to be switched on or off so as to carry out second-stage secondary charging on or off on the direct current capacitor.
And S360, detecting the zero crossing point moment of the third phase voltage of the three-phase alternating voltage through the first voltage detection device.
And S370, in a third time interval beginning from the zero crossing point moment of the third phase voltage, controlling the switches of the first phase half bridge, the second phase half bridge and the third phase half bridge to be switched on or switched off so as to conduct the secondary charging of the DC capacitor in a third phase.
And the first time interval, the second time interval and the third time interval all belong to the same alternating current voltage period.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (9)
1. A converter soft start circuit, comprising:
the first charging module comprises a first switch group, a three-phase rectifier and a direct current capacitor, wherein the first switch group is used for controlling the three-phase rectifier to rectify three-phase current into direct current so as to charge the direct current capacitor to a first voltage;
the second charging module comprises an alternating current input interface circuit, an energy storage circuit and a control switch group which are sequentially connected, the control switch group and the energy storage circuit are connected with a microprocessor, the microprocessor is used for providing a first pulse width control signal, and the control switch group controls the energy storage circuit to charge the direct current capacitor to a second voltage according to the first pulse width control signal;
the energy storage circuit comprises an LC circuit and a first voltage detection device which are sequentially connected with the AC input interface circuit, the LC circuit is used for storing electric energy, and the first voltage detection device is used for detecting energy output voltage at the output end of the LC circuit;
the first voltage detection device detects the zero crossing point moment of the first phase voltage of the three-phase alternating-current voltage according to a preset sampling period; and in a first time interval beginning at the zero-crossing point moment of the first phase voltage, controlling the switch of the upper bridge arm of the second phase half bridge, the switch of the lower bridge arm of the second phase half bridge, the switch of the upper bridge arm of the third phase half bridge and the switch of the lower bridge arm of the third phase half bridge to be in a cut-off state, and controlling the switch of the upper bridge arm of the first phase half bridge and the switch of the lower bridge arm of the first phase half bridge to be switched on and off at the frequency of a first pulse width control signal so as to perform first-stage secondary charging on the direct-current capacitor.
2. The circuit of claim 1, wherein the energy storage circuit comprises an LC circuit and a first voltage detection device, the LC circuit and the first voltage detection device are sequentially connected to the ac input interface circuit, the LC circuit is configured to store electric energy, and the first voltage detection device is configured to detect an energy output voltage at an output end of the LC circuit.
3. The circuit of claim 2, wherein the energy storage circuit further comprises a second voltage detection device coupled to the ac input interface circuit, the second voltage detection device being configured to detect the energy input voltage at the input of the LC circuit.
4. The circuit of claim 1 wherein the microprocessor provides the first pulse width control signal based on closed loop control pulse width modulation logic of the current transformer.
5. The circuit of claim 1 wherein the set of control switches comprises a switch of a first phase half bridge, a switch of a second phase half bridge, and a switch of a third phase half bridge connected in parallel across the dc capacitor.
6. The circuit of claim 1, wherein a resistor is connected in series between the first switch set and the three-phase rectifier.
7. A converter soft start method is characterized by comprising the following steps:
closing the first switch group to enable three-phase current to pass through a three-phase rectifier, and rectifying the three-phase current into direct current by the three-phase rectifier to charge a direct current capacitor for the first time;
disconnecting the first switch group after the voltage of the direct current capacitor reaches a first preset voltage;
controlling the on/off of the switch of the control switch group according to a preset first pulse width control signal so as to charge the direct-current capacitor for the second time;
finishing the soft start after the secondary charging of the direct current voltage reaches a second preset voltage value;
the switch of controlling the switch group is controlled to be switched on or switched off according to a preset first pulse width control signal, so that the secondary charging of the direct current capacitor comprises the following steps:
controlling the switches of all the control switch groups to be in a cut-off state;
detecting a zero crossing point moment of a first phase voltage of the three-phase alternating-current voltage by a first voltage detection device;
and in a first time interval starting from the zero-crossing time of the first phase voltage, controlling the switches of the second phase half bridge and the third phase half bridge to be in a cut-off state, and controlling the switch of the first phase half bridge to be switched on or switched off so as to carry out first-stage secondary charging on the direct-current capacitor.
8. The method of claim 7, wherein controlling the switches of the second and third phase half-bridges to be in an off state during a first time interval beginning at the first phase voltage zero-crossing time, and wherein controlling the switches of the first phase half-bridge to be on or off to charge the dc capacitor for a first period of time comprises:
detecting a second phase voltage zero crossing point moment of the three-phase alternating voltage by the first voltage detection device;
and in a second time interval beginning at the zero crossing point moment of the second phase voltage, controlling the switch of the third phase half bridge to be in a cut-off state, and controlling the switches of the first phase half bridge and the second phase half bridge to be switched on or switched off so as to carry out second-stage secondary charging on the direct-current capacitor.
9. The method of claim 8 wherein controlling the switches of the third phase half-bridge to be in an off state during a second time interval beginning at the zero-crossing time of the second phase voltage, the controlling the switches of the first and second phase half-bridges to be on or off to perform a second stage of secondary charging of a dc capacitor comprises:
detecting the zero crossing point moment of the third phase voltage of the three-phase alternating voltage by the first voltage detection device;
and in a third time interval beginning from the zero crossing point moment of the third phase voltage, controlling the switches of the first phase half bridge, the second phase half bridge and the third phase half bridge to be switched on or switched off so as to perform secondary charging of the DC capacitor in a third phase.
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| CN203166759U (en) * | 2013-04-03 | 2013-08-28 | 深圳市汇川技术股份有限公司 | A soft starting circuit of a converter power loop circuit |
| CN208028772U (en) * | 2018-02-11 | 2018-10-30 | 天津瑞能电气有限公司 | A kind of high-power converter soft starting circuit |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203166759U (en) * | 2013-04-03 | 2013-08-28 | 深圳市汇川技术股份有限公司 | A soft starting circuit of a converter power loop circuit |
| CN208028772U (en) * | 2018-02-11 | 2018-10-30 | 天津瑞能电气有限公司 | A kind of high-power converter soft starting circuit |
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| CN110336455A (en) | 2019-10-15 |
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