CN110138185B - Parallel current sharing control method for staggered full-bridge converter of alternating current power supply device - Google Patents
Parallel current sharing control method for staggered full-bridge converter of alternating current power supply device Download PDFInfo
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- CN110138185B CN110138185B CN201810105783.8A CN201810105783A CN110138185B CN 110138185 B CN110138185 B CN 110138185B CN 201810105783 A CN201810105783 A CN 201810105783A CN 110138185 B CN110138185 B CN 110138185B
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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
- H02M1/088—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices
Abstract
The invention discloses a parallel current sharing control method of a staggered phase full-bridge current converter of an alternating current power supply device, which comprises a feedback control circuit, a dead zone controller, a first full-bridge current converter, a second full-bridge current converter and a delay circuit, wherein the output end of the dead zone controller is electrically connected with the input end of the first full-bridge current converter, the input end of the delay circuit is connected between the dead zone controller and the first full-bridge current converter, the output end of the delay circuit is electrically connected with the input end of the second full-bridge current converter, the delay circuit receives a group of pulse width modulation signals, when the delay circuit receives the group of pulse width modulation, the group of pulse width modulation signals are adjusted according to a time delay control process to generate another group of pulse width modulation signals, so that the output voltage phases of the first full-bridge current converter and the second full-bridge current converter are staggered by 180 degrees and consistent, so as to achieve the purposes of reducing the manufacturing cost and achieving the current equalizing effect after parallel connection.
Description
Technical Field
The present invention relates to an ac power supply device, and more particularly, to a parallel current sharing control method for a cross-phase full bridge converter of an ac power supply device.
Background
In a conventional ac power supply apparatus, an input circuit receives a set of input signals and a set of triangular carrier signals, the input circuit includes two identical amplifying circuits, and the two amplifying circuits are connected to two dead zone controllers and then to two full bridge converters, so that two voltage signals can be output at one time, but the problem of large distortion of output voltage is caused.
In the prior art, another staggered pulse modulation circuit is provided, which also receives a set of input signals and two sets of triangular carrier signals through an input circuit, and the input circuit also includes two identical amplifying circuits, and the two amplifying circuits are connected with two dead zone controllers, so that although the problem of distortion is reduced, the problem of uneven current after two sets of full bridge converters are connected in parallel is generated.
According to the prior art, there are problems that a pulse modulation circuit of an alternating current power supply device has distortion degree of output voltage, uneven parallel current and increased manufacturing cost, and a need for a more solution is needed.
Disclosure of Invention
In view of the above problems in the prior art, it is a primary object of the present invention to provide a parallel current sharing control method for a cross-phase full-bridge converter of an ac power supply device, which is designed and improved for a pulse modulation circuit, thereby reducing the manufacturing cost and achieving the effect of current sharing after parallel connection.
The main technical means adopted for achieving the purpose is to make the staggered phase full-bridge current converter parallel current sharing control method of the alternating current power supply device, a dead zone controller is connected with a first full-bridge current converter, and a delay circuit is connected between the dead zone controller and a second full-bridge current converter, and the method mainly comprises the following steps executed by the delay circuit:
receiving a first set of pulse width modulation signals;
adjusting the first set of PWM signals according to a time delay control process to generate a second set of PWM signals, wherein the phase difference between the second set of PWM signals and the first set of PWM signals is 180 degrees;
the output voltages of the first converter and the second converter are consistent through the same feedback control circuit, so that the current after parallel connection is equalized.
Preferably, the time delay control process includes a delay phase of 180 degrees.
According to the method, the delay circuit receives the first group of pulse width modulation signals of the dead zone controller, and the delay circuit adjusts the first group of pulse width modulation signals and generates the second group of pulse width modulation signals according to the time delay control processing, wherein the phase difference of the second group of pulse width modulation signals and the first group of pulse width modulation signals is 180 degrees, so that the efficiency of reducing output ripple is achieved, the volume of an output filter is reduced, and the manufacturing cost is reduced; the same feedback control modulation circuit is adopted, so that the output voltages of the first full-bridge current converter and the second full-bridge current converter are consistent, and the purpose of current equalizing effect after parallel connection is achieved.
Another main technical means for achieving the above object is to provide the ac power supply device comprising:
an input circuit having a signal output terminal;
the dead zone controller is provided with a signal input end and two signal output ends, and the signal input end of the dead zone controller is electrically connected with the signal output end of the input circuit;
the first full-bridge converter is provided with two signal input ends and a signal output end, and the two signal input ends of the first full-bridge converter are electrically connected with the two signal output ends of the dead zone controller;
a second full-bridge converter having two signal input terminals and a signal output terminal;
the delay circuit is provided with two signal input ends and two signal output ends, the two signal input ends of the delay circuit are electrically connected between the dead zone controller and the first full-bridge current converter, and the two signal output ends of the delay circuit are electrically connected with the two signal input ends of the second full-bridge current converter;
the two signal input ends of the delay circuit receive a first group of pulse width modulation signals, and control and adjust the first group of pulse width modulation signals in a time delay way to generate a second group of pulse width modulation signals, the phase difference of the second group of pulse width modulation signals and the first group of pulse width modulation signals is 180 degrees, the delay circuit outputs the second group of pulse width modulation signals to the second full-bridge converter through two signal output ends, so that the phases of the output voltages of the first full-bridge converter and the second full-bridge converter are staggered by 180 degrees, the output voltages of the first full-bridge converter and the second full-bridge converter are consistent, and the current after parallel connection is equalized.
Preferably, the input circuit further has more than one signal input terminal, and the signal input terminal of the input circuit is used for receiving a sinusoidal reference signal and a feedback signal, and generating a control signal according to a triangular carrier signal.
Preferably, the input circuit comprises a feedback control circuit.
Preferably, the signal input terminal of the dead band controller receives the control signal output by the input circuit, so that the dead band controller outputs a first set of pwm signals.
Preferably, the first full-bridge inverter generates a first output voltage signal according to a first set of pwm signals outputted from the dead-zone controller; the delay circuit outputs a second group of pulse width modulation signals to the second full-bridge current converter through two signal output ends, so that a second output voltage signal generated by the second full-bridge current converter and the output voltage phase of the first full-bridge current converter are staggered by 180 degrees, output ripples can be reduced, the size of an output filter is reduced, and the output voltages of the first full-bridge current converter and the second full-bridge current converter are consistent due to the fact that the same feedback control circuit is used, and parallel current sharing is achieved.
Preferably, the ac power supply device further includes an output filter; the first full-bridge converter and the second full-bridge converter respectively transmit the first output voltage signal and the second output voltage signal to the output filter.
According to the above structure, the delay circuit receives the first set of pulse width modulation signals of the dead zone controller, the delay circuit adjusts the first set of pulse width modulation signals according to the time delay control processing, generates the second set of pulse width modulation signals, the phase difference between the second set of pulse width modulation signals and the first set of pulse width modulation signals is 180 degrees, so that the phases of the output voltages of the first full-bridge current converter and the second full-bridge current converter are staggered by 180 degrees, thereby achieving the efficiency of output ripple reduction, thereby reducing the volume of an output filter, achieving the purpose of reducing the manufacturing cost, and as the same feedback control circuit is used, the output voltages of the first full-bridge current converter and the second full-bridge current converter are consistent, thereby achieving the purpose of current equalizing effect after parallel connection.
Drawings
The drawings are only for purposes of illustrating and explaining the present invention and are not to be construed as limiting the scope of the present invention. Wherein the content of the first and second substances,
FIG. 1 is a block diagram of a circuit architecture according to a preferred embodiment of the present invention;
fig. 2 is a schematic diagram of a parallel current sharing control method according to a preferred embodiment of the invention.
Description of reference numerals:
10 input circuit 20 dead zone controller
30 first full bridge converter 40 second full bridge converter
50 delay circuit 60 output filter
Detailed Description
The technical means adopted by the invention to achieve the preset purpose are further described below by combining the accompanying drawings and the preferred embodiments of the invention.
Referring to fig. 1, the preferred embodiment of the present invention includes an input circuit 10, a dead-zone controller 20, a first full-bridge inverter 30, a second full-bridge inverter 40, a delay circuit 50 and an output filter 60; the input circuit 10 has more than one signal input end and a signal output end, the signal input end of the input circuit 10 is used for receiving a sinusoidal reference signal and a feedback signal, and generating a control signal according to a triangular carrier signal; in the preferred embodiment, the input circuit includes a feedback control circuit; the dead band controller 20 includes more than one inverter.
The dead zone controller 20 has a signal input end and two signal output ends, the signal input end of the dead zone controller 20 is electrically connected to the signal output end of the input circuit 10, and receives the control signal output by the input circuit 10; the first full-bridge inverter 30 has two signal input terminals and one signal output terminal, the two signal input terminals of the first full-bridge inverter 30 are electrically connected to the two signal output terminals of the dead zone controller 20, and the first full-bridge inverter 30 generates a first output voltage signal according to a first set of pwm signals outputted by the dead zone controller 20.
The second full-bridge inverter 40 has two signal input terminals and one signal output terminal; the delay circuit 50 has two signal input terminals and two signal output terminals, the two signal input terminals of the delay circuit 50 are electrically connected between the dead zone controller 20 and the first full-bridge inverter 30, the two signal output terminals of the delay circuit 50 are electrically connected with the two signal input terminals of the second full-bridge inverter 40, the two signal output terminals of the delay circuit 50 receive the first set of pulse width modulation signals outputted by the dead zone controller 20 and adjust the first set of pulse width modulation signals by a time delay control, the delay circuit 50 outputs a second set of pulse width modulation signals to the second full-bridge inverter 40 through the two signal output terminals, so that a second output voltage signal generated by the second full-bridge inverter 40 and the first output voltage signal generated by the first full-bridge inverter 30 are phase-crossed by 180 degrees to achieve the performance of output ripple reduction, Therefore, the volume of the output filter is reduced, the aim of reducing the manufacturing cost is fulfilled, and the same feedback control circuit is used, so that the output voltages of the first full-bridge current converter and the second full-bridge current converter are consistent, and the current equalization is realized after the parallel connection; finally, the first full-bridge inverter 30 and the second full-bridge inverter 40 respectively transmit the first output voltage signal and the second output voltage signal to the output filter 60 for filtering.
According to the structure of the foregoing preferred embodiment of the present invention, there is further provided a parallel current sharing control method for a cross-phase full-bridge converter of an ac power supply device in the preferred embodiment, mainly comprising the dead-zone controller 20 connected to the first full-bridge converter 30, and the delay circuit 50 connected between the dead-zone controller 20 and the second full-bridge converter 40, as shown in fig. 2, the method mainly comprises the following steps executed by the delay circuit 50:
receiving a first set of pwm signals outputted from the dead band controller 20 (S51);
adjusting the first set of PWM signals according to a time delay control process (S52) to generate a second set of PWM signals (S53); in the preferred embodiment, the time delay control process includes a delay phase of 180 degrees;
the second set of pwm signals is outputted (S53) such that the phases of the output voltages of the second full-bridge inverter 40 and the first full-bridge inverter 30 are staggered by 180 degrees, thereby reducing output ripple and output filter size, and reducing manufacturing cost.
Although the present invention has been described with reference to a preferred embodiment, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (7)
1. A parallel current sharing control method for staggered full-bridge current converter of AC power supply device is characterized in that a dead zone controller is connected with a first full-bridge current converter and outputs a first group of pulse width modulation signals to the first full-bridge current converter, and a delay circuit is connected between the dead zone controller and a second full-bridge current converter, the method mainly comprises the following steps executed by the delay circuit:
receiving the first set of PWM signals;
a time delay control process including a delay phase of 180 degrees;
adjusting the first set of PWM signals according to the time delay control processing to generate a second set of PWM signals, wherein the phase difference between the second set of PWM signals and the first set of PWM signals is 180 degrees;
the delay circuit outputs the second group of pulse width modulation signals to the second full-bridge converter, so that the phases of the output voltages of the first full-bridge converter and the second full-bridge converter are staggered by 180 degrees;
through the same feedback control circuit, the output voltage of the first full-bridge converter is consistent with the output voltage of the second full-bridge converter, so that the current after parallel connection is equalized.
2. An ac power supply apparatus, comprising:
an input circuit having a signal output terminal;
the dead zone controller is provided with a signal input end and two signal output ends, and the signal input end of the dead zone controller is electrically connected with the signal output end of the input circuit;
the first full-bridge converter is provided with two signal input ends and a signal output end, and the two signal input ends of the first full-bridge converter are electrically connected with the two signal output ends of the dead zone controller so as to receive a first group of pulse width modulation signals output by the dead zone controller;
a second full-bridge converter having two signal input terminals and a signal output terminal;
the delay circuit is provided with two signal input ends and two signal output ends, the two signal input ends of the delay circuit are electrically connected between the dead zone controller and the first full-bridge current converter, and the two signal output ends of the delay circuit are electrically connected with the two signal input ends of the second full-bridge current converter;
the two signal input ends of the delay circuit receive a first group of pulse width modulation signals, and control and adjust the first group of pulse width modulation signals by time delay to generate a second group of pulse width modulation signals, the phase difference between the second group of pulse width modulation signals and the phase difference between the first group of pulse width modulation signals is 180 degrees, the delay circuit outputs the second group of pulse width modulation signals to the second full-bridge converter through two signal output ends, so that the phases of output voltages of the first full-bridge converter and the second full-bridge converter are staggered by 180 degrees, the output voltages of the first full-bridge converter and the second full-bridge converter are consistent, and current after parallel connection is equalized;
through the same feedback control circuit, the output voltage of the first full-bridge converter is consistent with the output voltage of the second full-bridge converter, so that the current after parallel connection is equalized.
3. The ac power supply apparatus of claim 2, wherein the input circuit further has more than one signal input terminal, the signal input terminal of the input circuit is used for receiving a sinusoidal reference signal, a feedback signal, and generating a control signal according to a triangular carrier signal.
4. An AC power supply apparatus as claimed in claim 2 or 3, wherein the input circuit comprises the feedback control circuit.
5. The AC power supply apparatus according to claim 3, wherein the signal input terminal of the dead-band controller receives the control signal outputted from the input circuit, so that the dead-band controller outputs the first set of PWM signals.
6. The AC power supply apparatus according to claim 5, wherein the first full-bridge inverter generates a first output voltage signal according to the first set of PWM signals outputted by the dead-zone controller; the delay circuit outputs the second group of pulse width modulation signals to the second full-bridge current converter through two signal output ends, so that a second output voltage signal generated by the second full-bridge current converter and the output voltage phase of the first full-bridge current converter are staggered by 180 degrees, output ripples can be reduced, the size of an output filter is reduced, and the output voltages of the first full-bridge current converter and the second full-bridge current converter are consistent due to the fact that the same feedback control circuit is used, and parallel current sharing is achieved.
7. The ac power supply apparatus according to claim 6, further comprising an output filter; the first full-bridge converter and the second full-bridge converter respectively transmit the first output voltage signal and the second output voltage signal to the output filter.
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| CN201810105783.8A CN110138185B (en) | 2018-02-02 | 2018-02-02 | Parallel current sharing control method for staggered full-bridge converter of alternating current power supply device |
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| CN110138185B true CN110138185B (en) | 2022-04-19 |
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Citations (1)
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| CN102332839A (en) * | 2011-08-23 | 2012-01-25 | 南京航空航天大学 | Cascade type time-interval variable-order multi-level static converter |
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| CN102780221B (en) * | 2012-07-20 | 2014-08-27 | 上海交通大学 | System and method for controlling online type photovoltaic power generation microgrid without storage device |
| CN103346690B (en) * | 2013-07-05 | 2016-03-30 | 华为技术有限公司 | A kind of multi-electrical level inverter and electric power system |
| CN105846658B (en) * | 2016-03-23 | 2018-07-17 | 西安交通大学 | A kind of IGBT parallel connections Current for paralleled circuit |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102332839A (en) * | 2011-08-23 | 2012-01-25 | 南京航空航天大学 | Cascade type time-interval variable-order multi-level static converter |
Non-Patent Citations (1)
| Title |
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| 交错并联BOOST电路的PFC均流技术研究;刘萍;《平顶山学院学报》;20160430;第31卷(第2期);第30-33页 * |
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