CN110190768B - DC-AC converter and parallel current-sharing control method thereof - Google Patents
DC-AC converter and parallel current-sharing control method thereof Download PDFInfo
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- CN110190768B CN110190768B CN201810153604.8A CN201810153604A CN110190768B CN 110190768 B CN110190768 B CN 110190768B CN 201810153604 A CN201810153604 A CN 201810153604A CN 110190768 B CN110190768 B CN 110190768B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/493—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode the static converters being arranged for operation in parallel
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
- H02M7/5387—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
- H02M7/53871—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration with automatic control of output voltage or current
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
- Inverter Devices (AREA)
Abstract
The invention discloses a DC/AC converter and its parallel current sharing control method, which comprises a first DC/DC converter, a second DC/DC converter, a first full-bridge converter, a second full-bridge converter, a first sensor, a second sensor and a microprocessor, wherein the first DC/DC converter is connected with and controls the first full-bridge converter, the second DC/DC converter is connected with and controls the second full-bridge converter, the first sensor and the second sensor are respectively arranged at the power output ends of the first full-bridge converter and the second full-bridge converter, the microprocessor is respectively connected with the second DC/DC converter, the first sensor and the second sensor and receives the output signals provided by the first sensor and the second sensor, when the output signals are not equal, the output signal is controlled by pulse width modulation signal to adjust the output DC power signal, the output current after parallel connection can achieve the purpose of current sharing effect.
Description
Technical Field
The present invention relates to a dc-ac converter, and more particularly, to a dc-ac converter applied to an ac power supply and a parallel current-sharing control method thereof.
Background
In the power converter parallel technology of the conventional ac power supply, an input circuit usually receives a set of input signals and a set of triangular carrier signals, the input circuit includes two identical amplifying circuits, and two dc-dc converters are connected through the two amplifying circuits, and then two full-bridge converters are connected, so that two ac signals can be output once, but the output voltage is different due to the difference of the carrier signal size, and the current is not uniform after the two full-bridge converters are connected in parallel.
According to the prior art, the problems that the power converter parallel connection technology of the alternating current power supply has different output voltage and uneven parallel current exist, and a more solution is still necessary to be provided.
Disclosure of Invention
In view of the above problems in the prior art, a primary objective of the present invention is to provide a dc-ac converter and a parallel current sharing control method thereof, wherein two sets of output signals connected in parallel are detected, and then the pulse width modulation signal is used to control and adjust, so that the output signals connected in parallel can achieve the current sharing effect.
The main technical means adopted to achieve the above object is to make the parallel current sharing control method of the above dc/ac converter device, which is to set a sensor at the power output end of a first full bridge converter and a second full bridge converter, the power output end of the first full bridge converter and the power output end of the second full bridge converter are connected in parallel, the sensors provide output signals to a microprocessor, and the microprocessor connects and controls the second full bridge converter through a dc-to-dc converter, the method is mainly implemented by the microprocessor as follows:
detecting and receiving a first output signal and a second output signal;
judging whether the first output signal and the second output signal are not equal;
if yes, the DC-DC converter is controlled by a group of pulse width modulation signals to adjust the output DC power signal, so that the current of the first full-bridge converter and the second full-bridge converter after being connected in parallel is equalized.
Preferably, when the step is executed to the step of determining whether the first output signal and the second output signal are not equal, the method further includes the steps of: and when the first output signal is greater than the second output signal, the direct current power supply signal output by the direct current-to-direct current converter is increased.
Preferably, when the step is executed to the step of determining whether the first output signal and the second output signal are not equal, the method further includes the steps of: when the first output signal is smaller than the second output signal, the DC power signal output by the DC-DC converter is adjusted and reduced.
According to the method, the power output ends of the first full-bridge converter and the second full-bridge converter are respectively provided with sensors, the microprocessor is respectively connected with the DC-DC converter and the sensors, when the microprocessor detects and receives the first output signal and the second output signal generated by the sensors, the microprocessor judges whether the first output signal and the second output signal are unequal (including the first output signal is greater than or less than the second output signal), if so, the microprocessor controls the DC-DC converter by sending a pulse width modulation signal, and only needs to adjust the DC power signal output by the DC-DC converter, so that the output current after parallel connection can achieve the purpose of current equalizing effect.
Another main technical means for achieving the above object is to provide the ac power supply device comprising:
a first DC-DC converter;
the first full-bridge converter is provided with two power output ends and is electrically connected with the first direct current-to-direct current converter;
a first sensor, which is arranged on the power output end of the first full-bridge converter and is used for sensing the alternating current signal output by the first full-bridge converter;
a second DC-DC converter having a set of control signal output terminals and a driving signal input terminal;
the second full-bridge converter is provided with two power output ends and is electrically connected with the second direct current-to-direct current converter and is connected with the power output end of the first full-bridge converter in parallel;
a second sensor, which is arranged on the power output end of the second full-bridge converter and is used for sensing the alternating current signal output by the second full-bridge converter;
the microprocessor is provided with a driving signal output end and two sensing signal input ends, the microprocessor is connected with the first sensor and the second sensor through the sensing signal input ends, and the driving signal output end of the microprocessor is connected with the driving signal input end of the second direct current-direct current converter;
when the microprocessor detects and receives a first output signal provided by the first sensor and a second output signal provided by the second sensor, whether the first output signal is unequal to the second output signal is judged, if the first output signal is unequal to the second output signal, the microprocessor drives the second DC-DC converter, and controls the second DC-DC converter through a group of pulse width modulation signals to adjust a DC power supply signal output by the DC-DC converter so as to equalize the current after the first full bridge converter and the second full bridge converter are connected in parallel.
Preferably, when the microprocessor determines whether the first output signal and the second output signal are not equal, the microprocessor adjusts the dc power signal output by the dc-dc converter according to the set of pwm signals when the first output signal is greater than the second output signal.
Preferably, when the microprocessor determines whether the first output signal and the second output signal are not equal, the dc power signal output by the dc-dc converter is reduced by the set of pwm signals when the first output signal is smaller than the second output signal.
Preferably, the first dc-dc converter comprises more than one phase-shifted full-bridge dc-dc converter; the first full-bridge current converter is mainly composed of a plurality of power switches, an output inductor, a filter capacitor and a resistor element are respectively arranged on two power output ends of the first full-bridge current converter, and the first sensor is arranged on the resistor element in a crossing mode.
Preferably, the second dc-dc converter includes more than one phase-shifted full-bridge dc-dc converter, the second dc-dc converter mainly includes another plurality of power switches, the power switches of the second dc-dc converter are connected to the set of control signal output terminals of the second dc-dc converter, and the power output terminals of the second dc-dc converter and the power output terminals of the second full-bridge converter form a parallel connection; the second full bridge converter has another output inductor, another filter capacitor and another resistor element at its two power output ends, and the second sensor is arranged across the resistor element.
Preferably, the second dc-dc converter further includes a power controller, the power controller sends a set of pwm signals to the power switches of the second full-bridge converter, and transmits the output dc power signals to the power output terminal of the second full-bridge converter through a transformer and a set of rectifiers.
Preferably, the microprocessor includes a calculating unit, a first measuring unit and a second measuring unit, the calculating unit is connected to the second dc-dc converter, and the calculating unit is connected to the first sensor and the second sensor through the first measuring unit and the second measuring unit.
According to the above structure, the first dc-dc converter is connected to and controls the first full-bridge converter, the second dc-dc converter is connected to and controls the second full-bridge converter, the first sensor and the second sensor are respectively disposed on the power output terminals of the first full-bridge converter and the second full-bridge converter, the microprocessor is respectively connected to the second dc-dc converter, the first sensor and the second sensor and receives the output signals provided by the first sensor and the second sensor; when the microprocessor detects and receives a first output signal provided by the first sensor and a second output signal provided by the second sensor, the microprocessor judges whether the first output signal and the second output signal are unequal (including the first output signal is greater than or less than the second output signal), if so, the microprocessor drives the second DC-DC converter, and controls the second DC-DC converter through a pulse width modulation signal to adjust a DC power supply signal output by the second DC-DC converter, so that output currents of the first full-bridge converter and the second full-bridge converter after being connected in parallel can achieve the purpose of current equalizing effect.
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 circuit architecture diagram of a preferred embodiment of the present invention;
FIG. 2 is another circuit architecture diagram of a preferred embodiment of the present invention;
FIG. 3 is a flowchart of a control method according to a preferred embodiment of the invention.
Description of reference numerals:
11 first dc-dc converter 12 first full bridge converter
13 first sensor
21 second dc-dc converter 22 second full bridge converter
23 second sensor 24 power supply controller
30 microprocessor 31 computing unit
32 first measuring unit 33 second measuring unit
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, a preferred embodiment of the present invention includes a first dc-dc converter 11, a first full-bridge converter 12, a first sensor 13, a second dc-dc converter 21, a second full-bridge converter 22, a second sensor 23 and a microprocessor 30; wherein, the first dc-dc converter 11 is connected to the first full-bridge converter 12, the first full-bridge converter 12 has two power output terminals, the first sensor 13 is disposed at the power output terminal of the first full-bridge converter 12 for sensing the ac current signal outputted by the first full-bridge converter 12; in the preferred embodiment, the first dc-dc converter 11 includes more than one phase-shifted full-bridge dc-dc converter, the first full-bridge converter 12 is mainly composed of a plurality of power switches QA-QD, two power output terminals of the first full-bridge converter 12 are respectively provided with an output inductor Lo, a filter capacitor Co and a resistor element, and the first sensor 13 is disposed across the resistor element.
Referring to fig. 1 and 2, the second dc-dc converter 21 has a set of control signal output terminals and a driving signal input terminal, the second dc-dc converter 21 has two power output terminals, in the preferred embodiment, the second dc-dc converter 21 includes more than one phase-shifted full-bridge dc-dc converter, the second dc-dc converter 21 mainly includes another plurality of power switches QA-QD, in the preferred embodiment, the power switches QA-QD of the second dc-dc converter 21 are connected to the set of control signal output terminals of the second dc-dc converter 21, the power output terminal of the second dc-dc converter 21 is connected in parallel to the power input terminal of the second full-bridge converter 22, and the second sensor 23 is disposed on the power output terminal of the second full-bridge converter 22, for sensing the ac current signal outputted from the second full-bridge inverter 22.
Further, in the preferred embodiment, another output inductor Lo, another filter capacitor Co and another resistor element are disposed at two power output terminals of the second full-bridge inverter 22, and the second sensor 23 is disposed across the resistor element; in the preferred embodiment, the second dc-dc converter 21 further includes a power controller 24, the power controller 24 can send a set of Pulse Width Modulation (PWM) signals PWMA-D to the power switches QA-QD of the second dc-dc converter 21, and transmit the output dc power signal to the power input terminal of the second full-bridge converter 22 through a transformer TR and a set of rectifiers D1, D2. In the preferred embodiment, the power Controller 24 may be a Pulse Width Modulation Controller (pwm Controller), but not limited thereto.
The microprocessor 30 has a driving signal output terminal and two sensing signal input terminals a, B, the microprocessor 30 is connected to the first sensor 13 and the second sensor 23 through the sensing signal input terminals a, B, the driving signal output terminal of the microprocessor 30 is connected to the driving signal input terminal of the second dc-dc converter 21; in the preferred embodiment, the microprocessor 30 includes a calculating unit 31, a first measuring unit 32 and a second measuring unit 33, the calculating unit 31 is connected to the second dc-dc converter 21 through the driving signal output terminal, and the calculating unit 31 is connected to the first sensor 13 and the second sensor 23 through the first measuring unit 32 and the second measuring unit 33.
As shown in fig. 2, when the first measuring unit 32 of the microprocessor 30 detects and receives a first output signal generated by the first sensor 13 and the second measuring unit 33 of the microprocessor 30 detects and receives a second output signal generated by the second sensor 23, the calculating unit 31 of the microprocessor 30 determines whether the first output signal and the second output signal are not equal to each other, if the first output signal and the second output signal are not equal to each other (including the first output signal being greater than or less than the second output signal), the calculating unit 31 of the microprocessor 30 sends a driving signal to the power controller 24 of the second dc-dc converter 21 through the driving signal output terminal, the power controller 24 controls QA to QD of the second dc-dc converter 21 through the set of pulse width modulation signals PWMA to D, so as to adjust the dc power signal outputted from the second dc-dc converter 21, and equalize the currents after the first full-bridge converter 12 and the second full-bridge converter 22 are connected in parallel.
According to the structure of the foregoing preferred embodiment of the present invention, in the present preferred embodiment, a parallel current-sharing control method of a dc-ac converter device is further provided, wherein the first sensor 13 and the second sensor 23 are respectively disposed at the power output terminals of the first full-bridge converter 12 and the second full-bridge converter 22 which are connected in parallel, the first sensor 13 and the second sensor 23 respectively provide the first output signal and the second output signal to the microprocessor 30, and the microprocessor 30 drives the second dc-dc converter 21, and the second dc-dc converter 21 controls the second full-bridge converter 22 through the set of pulse width modulation signals, as shown in fig. 3, the method mainly comprises the microprocessor 30 performing the following steps:
detecting and receiving a first output signal outputted from the first full-bridge inverter 12 and a second output signal outputted from the second full-bridge inverter 22 (S31); in the preferred embodiment, the first output signal and the second output signal can be current signals respectively;
determining whether the first output signal and the second output signal are not equal (S32); in the preferred embodiment, when the first output signal is greater than the second output signal, the power controller 24 is used to boost the dc power signal output by the second dc-dc converter 21; when the first output signal is smaller than the second output signal, the power controller 24 is used to reduce the dc power signal output by the second dc-dc converter 21; in the preferred embodiment, the power Controller 24 may be a Pulse Width Modulation Controller (pwm Controller), but not limited thereto.
If yes, the second dc-dc converter is controlled by a set of pwm signals to adjust the dc power signal outputted from the second dc-dc converter 21, so as to equalize the currents after the first full-bridge converter 12 and the second full-bridge converter 22 are connected in parallel (S33).
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 (10)
1. A parallel current sharing control method for DC-AC converter is characterized in that a sensor is separately arranged at the power output ends of a first full-bridge converter and a second full-bridge converter, the power output end of the first full-bridge converter and the power output end of the second full-bridge converter are connected in parallel, the sensors provide output signals to a microprocessor, and the microprocessor controls the second full-bridge converter through a DC-DC converter connection, the method mainly comprises the following steps:
detecting and receiving a first output signal and a second output signal;
judging whether the first output signal and the second output signal are not equal;
if yes, the DC-DC converter is controlled by a group of pulse width modulation signals to adjust the output DC power signal, so that the current of the first full-bridge converter and the second full-bridge converter after being connected in parallel is equalized.
2. The parallel current sharing method of dc-ac converting devices according to claim 1, wherein when the step of determining whether the first output signal is not equal to the second output signal is performed, the method further comprises the steps of:
and when the first output signal is greater than the second output signal, the direct current power supply signal output by the direct current-to-direct current converter is increased.
3. The parallel current sharing control method of the dc-ac converting devices according to claim 1 or 2, wherein when the step is executed to "determine whether the first output signal and the second output signal are not equal", the method further comprises the following steps:
when the first output signal is smaller than the second output signal, the DC power signal output by the DC-DC converter is adjusted and reduced.
4. A dc-ac converter device, comprising:
a first DC-DC converter;
the first full-bridge converter is provided with two power output ends and is electrically connected with the first direct current-to-direct current converter;
a first sensor, which is arranged on the power output end of the first full-bridge converter and is used for sensing the alternating current signal output by the first full-bridge converter;
a second DC-DC converter having a set of control signal output terminals and a driving signal input terminal;
the second full-bridge converter is provided with two power output ends and is electrically connected with the second direct current-to-direct current converter and is connected with the power output end of the first full-bridge converter in parallel;
a second sensor, which is arranged on the power output end of the second full-bridge converter and is used for sensing the alternating current signal output by the second full-bridge converter;
the microprocessor is provided with a driving signal output end and two sensing signal input ends, the microprocessor is connected with the first sensor and the second sensor through the sensing signal input ends, and the driving signal output end of the microprocessor is connected with the driving signal input end of the second direct current-direct current converter;
when the microprocessor detects and receives a first output signal provided by the first sensor and a second output signal provided by the second sensor, whether the first output signal is unequal to the second output signal is judged, if the first output signal is unequal to the second output signal, the microprocessor drives the second DC-DC converter, and controls the second DC-DC converter through a group of pulse width modulation signals to adjust a DC power supply signal output by the DC-DC converter so as to equalize the current after the first full bridge converter and the second full bridge converter are connected in parallel.
5. The DC/AC converter according to claim 4, wherein when the microprocessor determines whether the first output signal is not equal to the second output signal, the microprocessor adjusts the DC power signal outputted from the DC/DC converter according to the set of PWM signals when the first output signal is greater than the second output signal.
6. The DC/AC converter according to claim 4 or 5, wherein when the microprocessor determines whether the first output signal is not equal to the second output signal, the DC/DC converter down-regulates the DC power signal outputted by the DC/DC converter according to the set of PWM signals when the first output signal is smaller than the second output signal.
7. The DC-to-AC converter arrangement according to claim 4, wherein the first DC-to-DC converter comprises more than one phase shifted full bridge DC-to-DC converter; the first full-bridge current converter is mainly composed of a plurality of power switches, an output inductor, a filter capacitor and a resistor element are respectively arranged on two power output ends of the first full-bridge current converter, and the first sensor is arranged on the resistor element in a crossing mode.
8. The DC-to-AC converter according to claim 4, wherein the second DC-to-DC converter comprises more than one phase-shifted full-bridge DC-to-DC converter, the second DC-to-DC converter is mainly composed of another plurality of power switches, the power switches of the second DC-to-DC converter are connected to the set of control signal output terminals of the second DC-to-DC converter, and the power output terminals of the second DC-to-DC converter are connected in parallel with the power input terminals of the second full-bridge converter; the second full bridge converter has another output inductor, another filter capacitor and another resistor element at its two power output ends, and the second sensor is arranged across the resistor element.
9. The DC-to-AC converter according to claim 8, wherein the second DC-to-DC converter further comprises a power controller, the power controller sends a set of PWM signals to the power switches of the second full-bridge converter, and transmits the output DC power signals to the power output terminal of the second full-bridge converter through a transformer and a set of rectifiers.
10. The DC/AC converter according to claim 4, wherein said microprocessor comprises a computing unit, a first measuring unit and a second measuring unit, said computing unit is connected to said second DC/DC converter, said computing unit is connected to said first sensor and said second sensor through said first measuring unit and said second measuring unit.
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| JPH07106066B2 (en) * | 1987-05-28 | 1995-11-13 | 富士電機株式会社 | Parallel connection circuit of single-phase inverter |
| TWI277282B (en) * | 2004-04-26 | 2007-03-21 | Delta Electronics Inc | New structured power supply system for a LCD apparatus |
| CN100414807C (en) * | 2005-01-21 | 2008-08-27 | 广西新未来信息产业股份有限公司 | Current-sharing control method and system for parallel modular inverse power supply |
| CN101202453B (en) * | 2006-12-15 | 2010-09-01 | 中兴通讯股份有限公司 | Method and system for controlling single-phase semi-bridge inversion parallel connection direct current circulating current |
| CN202384773U (en) * | 2011-12-05 | 2012-08-15 | 上海航天有线电厂 | Distributed control solar energy photovoltaic grid-connected system |
| US9263971B2 (en) * | 2011-12-16 | 2016-02-16 | Empower Micro Systems Inc. | Distributed voltage source inverters |
| CN202617033U (en) * | 2012-05-10 | 2012-12-19 | 宁波中焱光伏科技有限公司 | Synchronous control circuit for parallel inverter system |
| CN202617027U (en) * | 2012-05-10 | 2012-12-19 | 宁波中焱光伏科技有限公司 | Automatic current balancing circuit for parallel inverter system |
| CN104578859B (en) * | 2015-01-19 | 2017-01-18 | 西安交通大学 | Voltage-sharing controlling method for direct current bus voltage of single-phase power electronic transformer |
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