CN114172385A - Modulation method of three-bridge-arm topological circuit - Google Patents

Modulation method of three-bridge-arm topological circuit Download PDF

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Publication number
CN114172385A
CN114172385A CN202111327883.3A CN202111327883A CN114172385A CN 114172385 A CN114172385 A CN 114172385A CN 202111327883 A CN202111327883 A CN 202111327883A CN 114172385 A CN114172385 A CN 114172385A
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switching tube
conducted
tube
controlled
controlling
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易龙强
彭倩倩
刘钊
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Zhangzhou Kehua Technology Co Ltd
Kehua Data Co Ltd
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Zhangzhou Kehua Technology Co Ltd
Kehua Data Co Ltd
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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
    • H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
    • H02M5/40—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc
    • H02M5/42—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters
    • H02M5/44—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac
    • H02M5/453—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M5/458—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M5/4585—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only having a rectifier with controlled elements

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Inverter Devices (AREA)

Abstract

The embodiment of the application discloses a modulation method of a three-bridge-arm topological circuit, which specifically comprises the following steps: in each half cycle of input voltage, controlling the switching tubes of at least four three-bridge arm topological circuits to be in a high-frequency state, wherein the high-frequency state is a state with the on-off frequency of kilohertz level; and carrying out rectification modulation and inversion modulation on the three-bridge arm topological circuit through a switching tube of the three-bridge arm topological circuit.

Description

Modulation method of three-bridge-arm topological circuit
Technical Field
The embodiment of the application relates to the field of electricity, in particular to a modulation method of a three-bridge-arm topological circuit.
Background
With the continuous development of science and technology, people can continuously and deeply research electricity and continuously and deeply know circuits. The existing circuit can realize functions of rectification, inversion, photoelectric conversion, electric-heat conversion and the like, and greatly facilitates research, production and life of people.
However, when the existing circuit works, the zero crossing point distortion of the system bus voltage can occur, and even the problems of inductance saturation and capacitor overvoltage can be caused, so that the system bus voltage is unstable, and the production and the life are not facilitated.
Disclosure of Invention
The embodiment of the application provides a modulation method of a three-bridge-arm topological circuit.
A modulation method of a three-bridge-arm topological circuit comprises the following steps:
in each half cycle of input voltage, controlling at least four switching tubes of a three-bridge arm topological circuit to be in a high-frequency state, wherein the high-frequency state is a state with on-off frequency of kilohertz level, the three-bridge arm topological circuit comprises a first bridge arm, a second bridge arm and a third bridge arm, the first bridge arm is a power factor correction bridge arm formed by a first switching tube and a second switching tube, the second bridge arm is a common bridge arm formed by a third switching tube and a fourth switching tube, the third bridge arm is an inversion bridge arm formed by a fifth switching tube and a sixth switching tube, the three bridge arms are respectively connected in parallel between a positive bus and a negative bus, a bus is connected in parallel between the positive bus and the negative bus, the positive pole of the bus capacitor is connected with the positive bus, the midpoint of the first bridge arm is connected with the first input end of the three-bridge arm topological circuit through a first inductor, and the midpoint of the third bridge arm is connected with the first output end of the three-bridge arm topological circuit through a second inductor, a second output end of the three-bridge-arm topological circuit is connected with a second input end of the three-bridge-arm topological circuit through the midpoint of the second bridge arm;
and carrying out rectification modulation and inversion modulation on the three-bridge arm topological circuit through a switching tube of the three-bridge arm topological circuit.
Optionally, in each half cycle of the input voltage, the switching tubes of the at least four three-bridge arm topology circuits are controlled to be in a high-frequency state, including:
and in each half period of the input voltage, controlling the switching tubes of at least four three-bridge arm topological circuits to be in a high-frequency state by a pulse width modulation method.
Optionally, in each half cycle of the input voltage, the switching tubes of the at least four three-bridge arm topology circuits are controlled to be in a high-frequency state, including:
when the three-bridge-arm topology circuit is in the positive half cycle or the negative half cycle of the input voltage, the first switch tube, the second switch tube, the fifth switch tube and the sixth switch tube are controlled to be in a high-frequency state, the first switch tube and the second switch tube are conducted in a complementary mode, and the fifth switch tube and the sixth switch tube are conducted in a complementary mode.
Optionally, the three-bridge arm topology circuit is subjected to rectification modulation and inversion modulation through a switching tube of the three-bridge arm topology circuit, including:
when the three-bridge-arm topology circuit is in the positive half cycle of the input voltage, controlling the third switching tube to be kept off, and controlling the fourth switching tube to be kept on:
the second switching tube is controlled to be conducted, the first inductor stores energy, the first switching tube is controlled to be conducted, and the bus capacitor is charged;
the fifth switching tube is controlled to be conducted, the second inductor stores energy, the sixth switching tube is controlled to be conducted, and the second inductor realizes follow current;
when the three-bridge-arm topology circuit is in the negative half cycle of the input voltage, controlling the third switching tube to be kept on, and controlling the fourth switching tube to be kept off:
the first switch tube is controlled to be conducted, the first inductor stores energy, the second switch tube is controlled to be conducted, and the bus capacitor is charged;
and controlling the sixth switching tube to be conducted, storing energy by the second inductor, controlling the fifth switching tube to be conducted, and realizing follow current by the second inductor.
Optionally, in each half cycle of the input voltage, the switching tubes of the at least four three-bridge arm topology circuits are controlled to be in a high-frequency state, including:
when the input voltage is greater than the output voltage and the three-bridge-arm topological circuit is in the positive half cycle of the input voltage, controlling the third switching tube, the fourth switching tube, the fifth switching tube and the sixth switching tube to be in a high-frequency state, wherein the third switching tube and the fourth switching tube are conducted in a complementary mode, and the fifth switching tube and the sixth switching tube are conducted in a complementary mode;
when the input voltage is greater than the output voltage and the three-bridge-arm topological circuit is in the negative half cycle of the input voltage, controlling the first switching tube, the second switching tube, the fifth switching tube and the sixth switching tube to be in a high-frequency state, wherein the first switching tube and the second switching tube are conducted in a complementary mode, and the fifth switching tube and the sixth switching tube are conducted in a complementary mode;
when the input voltage is smaller than the output voltage and the three-bridge-arm topological circuit is in the positive half cycle of the input voltage, controlling the first switch tube, the second switch tube, the third switch tube and the fourth switch tube to be in a high-frequency state, wherein the first switch tube and the second switch tube are conducted in a complementary mode, and the third switch tube and the fourth switch tube are conducted in a complementary mode;
when the input voltage is smaller than the output voltage and the three-bridge-arm topological circuit is in the negative half cycle of the input voltage, the first switch tube, the second switch tube, the fifth switch tube and the sixth switch tube are controlled to be in a high-frequency state, the first switch tube and the second switch tube are conducted in a complementary mode, and the fifth switch tube and the sixth switch tube are conducted in a complementary mode.
Optionally, the three-bridge arm topology circuit is subjected to rectification modulation and inversion modulation through a switching tube of the three-bridge arm topology circuit, including:
when the input voltage is greater than the output voltage and the three-bridge arm topology circuit is in the positive half cycle of the input voltage, controlling the first switch tube to be kept on, and controlling the second switch tube to be kept off:
the third switching tube is controlled to be conducted, the first inductor stores energy, the fourth switching tube is controlled to be conducted, and the bus capacitor is charged;
the fourth switching tube and the fifth switching tube are controlled to be conducted at the same time, the second inductor stores energy, the fourth switching tube and the sixth switching tube are controlled to be conducted at the same time, or the third switching tube and the fifth switching tube are controlled to be conducted at the same time, and the second inductor realizes follow current;
when the input voltage is greater than the output voltage and the three-bridge-arm topological circuit is in the negative half cycle of the input voltage, controlling the third switching tube to be kept on, and controlling the fourth switching tube to be kept off:
the first switch tube is controlled to be conducted, the first inductor stores energy, the second switch tube is controlled to be conducted, and the bus capacitor is charged;
the sixth switching tube is controlled to be conducted, the second inductor stores energy, the fifth switching tube is controlled to be conducted, and the second inductor realizes follow current;
when the input voltage is less than the output voltage and the three-bridge arm topology circuit is in the positive half cycle of the input voltage, controlling the fifth switching tube to be kept on, and controlling the sixth switching tube to be kept off:
the first switch tube and the third switch tube are controlled to be conducted at the same time, or the second switch tube and the fourth switch tube are controlled to be conducted at the same time, the first inductor stores energy, the first switch tube and the fourth switch tube are controlled to be conducted at the same time, and the bus capacitor is charged;
controlling the fourth switching tube to be conducted, storing energy by the second inductor, controlling the third switching tube to be conducted, and realizing follow current by the second inductor;
when the input voltage is smaller than the output voltage and the three-bridge-arm topological circuit is in the negative half cycle of the input voltage, controlling the third switching tube to be kept on, and controlling the fourth switching tube to be kept off:
the first switch tube is controlled to be conducted, the first inductor stores energy, the second switch tube is controlled to be conducted, and the bus capacitor is charged;
and controlling the sixth switching tube to be conducted, storing energy by the second inductor, controlling the fifth switching tube to be conducted, and realizing follow current by the second inductor.
Optionally, in each half cycle of the input voltage, the switching tubes of the at least four three-bridge arm topology circuits are controlled to be in a high-frequency state, including:
when the three-bridge arm topology circuit is in a positive half cycle or a negative half cycle of input voltage, the first switching tube, the second switching tube, the third switching tube, the fourth switching tube, the fifth switching tube and the sixth switching tube are controlled to be in a high-frequency state, the first switching tube and the second switching tube are conducted in a complementary mode, the third switching tube and the fourth switching tube are conducted in a complementary mode, and the fifth switching tube and the sixth switching tube are conducted in a complementary mode.
Optionally, the three-bridge arm topology circuit is subjected to rectification modulation and inversion modulation through a switching tube of the three-bridge arm topology circuit, including:
when the three-bridge arm topological circuit is in the positive half cycle of the input voltage:
the first switch tube and the third switch tube are controlled to be conducted at the same time, or the second switch tube and the fourth switch tube are controlled to be conducted at the same time, the first inductor stores energy, the first switch tube and the fourth switch tube are controlled to be conducted at the same time, and the bus capacitor is charged;
the fourth switching tube and the fifth switching tube are controlled to be conducted at the same time, the second inductor stores energy, the fourth switching tube and the sixth switching tube are controlled to be conducted at the same time, or the third switching tube and the fifth switching tube are controlled to be conducted at the same time, and the second inductor realizes follow current;
when the three-bridge arm topological circuit is in the negative half cycle of the input voltage:
controlling the second switching tube and the fourth switching tube to be conducted at the same time, or controlling the first switching tube and the third switching tube to be conducted at the same time, storing energy by the first inductor, controlling the second switching tube and the third switching tube to be conducted at the same time, and charging the bus capacitor;
and controlling the third switching tube and the sixth switching tube to be switched on at the same time, storing energy by the second inductor, controlling the third switching tube and the fifth switching tube to be switched on at the same time, or controlling the fourth switching tube and the sixth switching tube to be switched on at the same time, and realizing follow current by the second inductor.
Optionally, in each half cycle of the input voltage, the switching tubes of the at least four three-bridge arm topology circuits are controlled to be in a high-frequency state, including:
when the input voltage is greater than the output voltage and the three-bridge-arm topological circuit is in the positive half cycle or the negative half cycle of the input voltage, controlling the third switching tube, the fourth switching tube, the fifth switching tube and the sixth switching tube to be in a high-frequency state, wherein the third switching tube and the fourth switching tube are conducted in a complementary mode, and the fifth switching tube and the sixth switching tube are conducted in a complementary mode;
when the input voltage is smaller than the output voltage and the three-bridge-arm topological circuit is in the positive half cycle or the negative half cycle of the input voltage, the first switch tube, the second switch tube, the third switch tube and the fourth switch tube are controlled to be in a high-frequency state, the first switch tube and the second switch tube are conducted in a complementary mode, and the third switch tube and the fourth switch tube are conducted in a complementary mode.
Optionally, the three-bridge arm topology circuit is subjected to rectification modulation and inversion modulation through a switching tube of the three-bridge arm topology circuit, including:
when the input voltage is greater than the output voltage and the three-bridge arm topology circuit is in the positive half cycle of the input voltage, controlling the first switch tube to be kept on, and controlling the second switch tube to be kept off:
the third switching tube is controlled to be conducted, the first inductor stores energy, the fourth switching tube is controlled to be conducted, and the bus capacitor is charged;
the fourth switching tube and the fifth switching tube are controlled to be conducted at the same time, the second inductor stores energy, the fourth switching tube and the sixth switching tube are controlled to be conducted at the same time, or the third switching tube and the fifth switching tube are controlled to be conducted at the same time, and the second inductor realizes follow current;
when the input voltage is greater than the output voltage and the three-bridge arm topology circuit is in the negative half cycle of the input voltage, the first switch tube is kept to be switched off, and the second switch tube is kept to be switched on:
controlling the fourth switching tube to be conducted, storing energy by the first inductor, controlling the third switching tube to be conducted, and charging the bus capacitor;
the third switching tube and the sixth switching tube are controlled to be conducted at the same time, the second inductor stores energy, the third switching tube and the fifth switching tube are controlled to be conducted at the same time, or the fourth switching tube and the sixth switching tube are controlled to be conducted at the same time, and the second inductor realizes follow current;
when the input voltage is less than the output voltage and the three-bridge arm topology circuit is in the positive half cycle of the input voltage, controlling the fifth switching tube to be kept on, and controlling the sixth switching tube to be kept off:
the first switch tube and the third switch tube are controlled to be conducted at the same time, or the second switch tube and the fourth switch tube are controlled to be conducted at the same time, the first inductor stores energy, the first switch tube and the fourth switch tube are controlled to be conducted at the same time, and the bus capacitor is charged;
controlling the fourth switching tube to be conducted, storing energy by the second inductor, controlling the third switching tube to be conducted, and realizing follow current by the second inductor;
when the input voltage is less than the output voltage and the three-bridge arm topology circuit is in the negative half cycle of the input voltage, controlling the fifth switching tube to be kept off, and controlling the sixth switching tube to be kept on:
the first switch tube and the third switch tube are controlled to be conducted at the same time, or the second switch tube and the fourth switch tube are controlled to be conducted at the same time, the first inductor stores energy, the first switch tube and the fourth switch tube are controlled to be conducted at the same time, and the bus capacitor is charged;
and controlling the third switching tube to be conducted, storing energy by the second inductor, controlling the fourth switching tube to be conducted, and realizing follow current by the second inductor.
According to the technical scheme, the embodiment of the application has the following advantages:
by controlling at least four switching tubes in the three-bridge arm topological circuit to be in a high-frequency state and combining with the control of other switching tubes in the three-bridge arm topological circuit, the problem of zero crossing point distortion of system bus voltage can be avoided, so that the system can stably run, and the working efficiency is improved.
Drawings
FIG. 1 is a schematic circuit diagram of a three-bridge arm topology according to an embodiment of the present application;
fig. 2 is a schematic diagram of an embodiment of a three-bridge-arm topology circuit modulation method according to an embodiment of the present application;
fig. 3 is a schematic diagram of another embodiment of a three-bridge-arm topology circuit modulation method according to an embodiment of the present application;
fig. 4 is a schematic diagram of another embodiment of a three-bridge-arm topology circuit modulation method according to an embodiment of the present application;
fig. 5 is a schematic diagram of another embodiment of a three-bridge-arm topology circuit modulation method according to an embodiment of the present application;
fig. 6 is a schematic diagram of another embodiment of a three-bridge-arm topology circuit modulation method according to an embodiment of the present application;
fig. 7 is a schematic diagram of another embodiment of a three-bridge-arm topology circuit modulation method according to an embodiment of the present application;
fig. 8 is a schematic diagram of another embodiment of a three-bridge-arm topology circuit modulation method according to an embodiment of the present application.
Detailed Description
The embodiment of the application provides a modulation method of a three-bridge-arm topological circuit.
The three-bridge arm topological circuit is a circuit with wide application, can realize power factor correction and inversion functions, and has the advantages of low cost and high utilization rate of devices.
Referring to fig. 1, a three-leg topology circuit according to an embodiment of the present disclosure includes: the bridge circuit comprises a first bridge arm, a second bridge arm, a third bridge arm, a first inductor, a second inductor and a bus capacitor.
The first bridge arm is a power factor correction bridge arm formed by a first switching tube and a second switching tube, the second bridge arm is a common bridge arm formed by a third switching tube and a fourth switching tube, the third bridge arm is an inverter bridge arm formed by a fifth switching tube and a sixth switching tube, the three bridge arms are respectively connected in parallel between a positive bus and a negative bus, a bus capacitor is connected in parallel between the positive bus and the negative bus, the positive electrode of the bus capacitor is connected with the positive bus, the midpoint of the first bridge arm is connected with the first input end of the three-bridge-arm topological circuit through a first inductor, the midpoint of the third bridge arm is connected with the first output end of the three-bridge-arm topological circuit through a second inductor, and the second output end of the three-bridge-arm topological circuit is connected with the second input end of the three-bridge-arm topological circuit through the midpoint of the second bridge arm.
Based on the three-bridge arm topology circuit, a modulation method of the three-bridge arm topology circuit in the embodiment of the present application is described below.
Referring to fig. 2, an embodiment of a modulation method for a three-bridge-arm topology circuit according to the embodiment of the present application includes:
201. controlling the switching tubes of at least four three-bridge arm topological circuits to be in a high-frequency state in each half period of the input voltage;
and controlling the switching tubes of the at least four three-bridge arm topological circuits to be in a high-frequency state in each half cycle of the input voltage, wherein the high-frequency state is a state with the on-off frequency of kilohertz level in each half cycle regardless of the positive cycle or the negative cycle, namely thousands of times per second in the on-off times.
The switching tube can be controlled to be in a high-frequency state by a pulse width modulation method, wherein the sinusoidal pulse width modulation method is most commonly used. For example, a modulated wave and a carrier wave are obtained, the two waves are compared, the switching tube is turned on when the modulated wave is larger than the carrier wave, and the switching tube is turned off when the modulated wave is smaller than the carrier wave.
202. And carrying out rectification modulation and inversion modulation on the three-bridge arm topological circuit through a switching tube of the three-bridge arm topological circuit.
And carrying out rectification modulation and inversion modulation on the three-bridge-arm topological circuit according to at least four switching tubes in a high-frequency state. The switching tubes in the high-frequency state can have four or six or other conditions.
In the embodiment of the application, by controlling at least four switching tubes in the three-bridge arm topological circuit to be in a high-frequency state and combining with the control of other switching tubes in the three-bridge arm topological circuit, the problem of zero crossing distortion of the system bus voltage can be avoided, so that the system can stably operate, and the working efficiency is improved.
Referring to fig. 3, another embodiment of a modulation method for a three-bridge-arm topology circuit according to the embodiment of the present application includes:
301. when the three-bridge-arm topology circuit is in a positive half cycle or a negative half cycle of the input voltage, controlling the first switching tube, the second switching tube, the fifth switching tube and the sixth switching tube to be in a high-frequency state;
when the three-bridge-arm topology circuit is in the positive half cycle or the negative half cycle of the input voltage, the first switching tube, the second switching tube, the fifth switching tube and the sixth switching tube are controlled to be in a high-frequency state. The first switch tube and the second switch tube are conducted complementarily, and the fifth switch tube and the sixth switch tube are conducted complementarily.
302. When the three-bridge-arm topology circuit is in the positive half cycle of the input voltage, controlling the third switching tube to be kept off, and controlling the fourth switching tube to be kept on:
1) the second switching tube is controlled to be conducted, the first inductor stores energy, the first switching tube is controlled to be conducted, and the bus capacitor is charged;
in the rectification modulation, when the second switch tube is switched on, the first input end sequentially passes through the body diode of the first inductor, the second switch tube and the fourth switch tube and the second input end forms a current loop, the first inductor stores energy, and when the first switch tube is switched on, the first input end sequentially passes through the body diode of the first inductor, the body diode of the first switch tube, the bus capacitor, the body diode of the fourth switch tube and the second input end forms a current loop to charge the bus capacitor.
2) The fifth switching tube is controlled to be conducted, the second inductor stores energy, the sixth switching tube is controlled to be conducted, and the second inductor realizes follow current;
in the inversion modulation, when the fifth switch tube is switched on, the bus capacitor sequentially passes through the fifth switch tube, the second inductor, the first output end, the second output end and the fourth switch tube to form a current loop, the second inductor stores energy, when the sixth switch tube is switched on, the second inductor sequentially passes through the first output end, the second output end, the fourth switch tube and a body diode of the sixth switch tube to form a current loop, and the second inductor realizes follow current.
303. When the three-bridge-arm topology circuit is in the negative half cycle of the input voltage, controlling the third switching tube to be kept on, and controlling the fourth switching tube to be kept off:
1) the first switch tube is controlled to be conducted, the first inductor stores energy, the second switch tube is controlled to be conducted, and the bus capacitor is charged;
in rectification modulation, when a first switch tube is conducted, a second input end sequentially passes through a body diode of a third switch tube, the first switch tube, a first inductor and the first input end to form a current loop, the first inductor stores energy, and when the second switch tube is conducted, the second input end sequentially passes through the body diode of the third switch tube, a bus capacitor, the body diode of the second switch tube, the first inductor and the first input end to form the current loop to charge the bus capacitor.
2) And controlling the sixth switching tube to be conducted, storing energy by the second inductor, controlling the fifth switching tube to be conducted, and realizing follow current by the second inductor.
In the inverter modulation, when the sixth switching tube is switched on, the bus capacitor sequentially passes through the third switching tube, the second output end, the first output end, the second inductor and the sixth switching tube to form a current loop, the second inductor stores energy, when the fifth switching tube is switched on, the second inductor sequentially passes through the body diode of the fifth switching tube, the third switching tube, the second output end and the first output end to form the current loop, and the second inductor realizes follow current.
In this embodiment, the third switching tube and the fourth switching tube are turned off in a half period, and the half period is kept on. By controlling at least four switching tubes in the three-bridge arm topological circuit to be in a high-frequency state and combining with the control of other switching tubes in the three-bridge arm topological circuit, the utilization rate of existing devices is high, and input harmonic waves and output harmonic waves can be inhibited by the characteristic that the current of a common bridge arm is small, so that the problem of zero crossing point distortion of system bus voltage is avoided, the system is enabled to operate stably, and the working efficiency is improved.
Referring to fig. 4, another embodiment of a modulation method for a three-bridge-arm topology circuit according to the embodiment of the present application includes:
401. when the input voltage is greater than the output voltage and the three-bridge-arm topological circuit is in the positive half cycle of the input voltage, controlling the third switching tube, the fourth switching tube, the fifth switching tube and the sixth switching tube to be in a high-frequency state;
when the input voltage is greater than the output voltage and the three-bridge-arm topological circuit is in the positive half cycle of the input voltage, the third switching tube, the fourth switching tube, the fifth switching tube and the sixth switching tube are controlled to be in a high-frequency state. The third switching tube and the fourth switching tube are conducted complementarily, and the fifth switching tube and the sixth switching tube are conducted complementarily.
402. When the input voltage is greater than the output voltage and the three-bridge-arm topological circuit is in the negative half cycle of the input voltage, controlling the first switching tube, the second switching tube, the fifth switching tube and the sixth switching tube to be in a high-frequency state;
when the input voltage is greater than the output voltage and the three-bridge-arm topological circuit is in the negative half cycle of the input voltage, the first switching tube, the second switching tube, the fifth switching tube and the sixth switching tube are controlled to be in a high-frequency state, wherein the first switching tube and the second switching tube are conducted in a complementary mode, and the fifth switching tube and the sixth switching tube are conducted in a complementary mode.
403. When the input voltage is greater than the output voltage and the three-bridge arm topology circuit is in the positive half cycle of the input voltage, controlling the first switch tube to be kept on, and controlling the second switch tube to be kept off:
1) the third switching tube is controlled to be conducted, the first inductor stores energy, the fourth switching tube is controlled to be conducted, and the bus capacitor is charged;
in rectification modulation, when a third switching tube is conducted, a first input end sequentially passes through a first inductor, a body diode of the first switching tube, the third switching tube and a second input end to form a current loop, when the first inductor stores energy, and when a fourth switching tube is conducted, the first input end sequentially passes through the first inductor, the body diode of the first switching tube, a bus capacitor, the body diode of the fourth switching tube and the second input end to form the current loop and charge the bus capacitor;
2) the fourth switching tube and the fifth switching tube are controlled to be conducted at the same time, the second inductor stores energy, the fourth switching tube and the sixth switching tube are controlled to be conducted at the same time, or the third switching tube and the fifth switching tube are controlled to be conducted at the same time, and the second inductor realizes follow current;
in the inversion modulation, when the fourth switch tube and the fifth switch tube are switched on at the same time, the bus capacitor sequentially passes through the fifth switch tube, the second inductor, the first output end, the second output end and the fourth switch tube to form a current loop, the second inductor stores energy, when the fourth switch tube and the sixth switch tube are switched on at the same time, the second inductor sequentially passes through the body diodes of the first output end, the second output end, the fourth switch tube and the sixth switch tube to form a current loop, and the second inductor realizes follow current. Or when the third switching tube and the fifth switching tube are conducted simultaneously, the second inductor sequentially passes through the first output end, the second output end, the body diode of the third switching tube and the fifth switching tube to form a current loop, and the second inductor can realize follow current.
404. When the input voltage is greater than the output voltage and the three-bridge-arm topological circuit is in the negative half cycle of the input voltage, controlling the third switching tube to be kept on, and controlling the fourth switching tube to be kept off:
1) the first switch tube is controlled to be conducted, the first inductor stores energy, the second switch tube is controlled to be conducted, and the bus capacitor is charged;
in rectification modulation, when a first switching tube is conducted, a second input end sequentially passes through a body diode of a third switching tube, the first switching tube, a first inductor and the first input end to form a current loop, the first inductor stores energy, and when the second switching tube is conducted, the second input end sequentially passes through the body diode of the third switching tube, a bus capacitor, the body diode of the second switching tube, the first inductor and the first input end to form a current loop and charges the bus capacitor;
2) and controlling the sixth switching tube to be conducted, storing energy by the second inductor, controlling the fifth switching tube to be conducted, and realizing follow current by the second inductor.
In the inverter modulation, when the sixth switching tube is switched on, the bus capacitor sequentially passes through the third switching tube, the second output end, the first output end, the second inductor and the sixth switching tube to form a current loop, the second inductor stores energy, when the fifth switching tube is switched on, the second inductor sequentially passes through the body diode of the fifth switching tube, the third switching tube, the second output end and the first output end to form the current loop, and the second inductor realizes follow current.
In this embodiment, the half cycle of the third switching tube is in a high-frequency state, the half cycle is maintained to be on, the half cycle of the fourth switching tube is in a high-frequency state, and the half cycle is maintained to be off. By controlling at least four switching tubes in the three-bridge arm topological circuit to be in a high-frequency state and combining with the control of other switching tubes in the three-bridge arm topological circuit, the utilization rate of existing devices is high, input harmonic waves and output harmonic waves can be inhibited through the characteristic that the current of a common bridge arm is small, the zero crossing distortion of the system bus voltage is avoided, the system is enabled to operate stably, and the working efficiency is improved. Referring to fig. 5, another embodiment of a modulation method for a three-bridge-arm topology circuit according to the embodiment of the present application includes:
501. when the input voltage is smaller than the output voltage and the three-bridge-arm topological circuit is in the positive half cycle of the input voltage, controlling the first switching tube, the second switching tube, the third switching tube and the fourth switching tube to be in a high-frequency state;
when the input voltage is smaller than the output voltage and the three-bridge-arm topological circuit is in the positive half cycle of the input voltage, the first switch tube, the second switch tube, the third switch tube and the fourth switch tube are controlled to be in a high-frequency state, wherein the first switch tube is conducted with the second switch tube in a complementary mode, and the third switch tube is conducted with the fourth switch tube in a complementary mode.
502. When the input voltage is smaller than the output voltage and the three-bridge-arm topological circuit is in the negative half cycle of the input voltage, controlling the first switching tube, the second switching tube, the fifth switching tube and the sixth switching tube to be in a high-frequency state;
when the input voltage is smaller than the output voltage and the three-bridge-arm topological circuit is in the negative half cycle of the input voltage, the first switching tube, the second switching tube, the fifth switching tube and the sixth switching tube are controlled to be in a high-frequency state, wherein the first switching tube and the second switching tube are conducted in a complementary mode, and the fifth switching tube and the sixth switching tube are conducted in a complementary mode.
503. When the input voltage is less than the output voltage and the three-bridge arm topology circuit is in the positive half cycle of the input voltage, controlling the fifth switching tube to be kept on, and controlling the sixth switching tube to be kept off:
1) the first switch tube and the third switch tube are controlled to be conducted at the same time, or the second switch tube and the fourth switch tube are controlled to be conducted at the same time, the first inductor stores energy, the first switch tube and the fourth switch tube are controlled to be conducted at the same time, and the bus capacitor is charged;
in the rectification modulation, when first switch tube and third switch tube simultaneous segment switched on, first input end passes through first inductance in proper order, the body diode of first switch tube, third switch tube and second input end formation current loop, first inductance energy storage, perhaps, when second switch tube and fourth switch tube simultaneous segment switched on, first input end passes through first inductance in proper order, the body diode and the second input end formation current loop of second switch tube, fourth switch tube, first inductance also can the energy storage. When the first switch tube and the fourth switch tube are conducted at the same time, the first input end sequentially passes through the first inductor, the body diode of the first switch tube, the bus capacitor, the body diode of the fourth switch tube and the second input end to form a current loop, and the current loop charges the bus capacitor;
2) controlling the fourth switching tube to be conducted, storing energy by the second inductor, controlling the third switching tube to be conducted, and realizing follow current by the second inductor;
in the inverter modulation, when the fourth switching tube is switched on, the bus capacitor sequentially passes through the fifth switching tube, the second inductor, the first output end, the second output end and the fourth switching tube to form a current loop, the second inductor stores energy, when the third switching tube is switched on, the second inductor sequentially passes through the first output end, the second output end, the body diode of the third switching tube and the fifth switching tube to form a current loop, and the second inductor realizes follow current.
504. When the input voltage is smaller than the output voltage and the three-bridge-arm topological circuit is in the negative half cycle of the input voltage, controlling the third switching tube to be kept on, and controlling the fourth switching tube to be kept off:
1) the first switch tube is controlled to be conducted, the first inductor stores energy, the second switch tube is controlled to be conducted, and the bus capacitor is charged;
in rectification modulation, when a first switching tube is conducted, a second input end sequentially passes through a body diode of a third switching tube, the first switching tube, a first inductor and the first input end to form a current loop, the first inductor stores energy, and when the second switching tube is conducted, the second input end sequentially passes through the body diode of the third switching tube, a bus capacitor, the body diode of the second switching tube, the first inductor and the first input end to form a current loop and charges the bus capacitor;
2) and controlling the sixth switching tube to be conducted, storing energy by the second inductor, controlling the fifth switching tube to be conducted, and realizing follow current by the second inductor.
In the inverter modulation, when the sixth switching tube is switched on, the bus capacitor sequentially passes through the third switching tube, the second output end, the first output end, the second inductor and the sixth switching tube to form a current loop, the second inductor stores energy, when the fifth switching tube is switched on, the second inductor sequentially passes through the body diode of the fifth switching tube, the third switching tube, the second output end and the first output end to form the current loop, and the second inductor realizes follow current.
In this embodiment, the half cycle of the third switching tube is in a high-frequency state, the half cycle is maintained to be on, the half cycle of the fourth switching tube is in a high-frequency state, and the half cycle is maintained to be off. By controlling at least four switching tubes in the three-bridge arm topological circuit to be in a high-frequency state and combining with the control of other switching tubes in the three-bridge arm topological circuit, the utilization rate of existing devices is high, input harmonic waves and output harmonic waves can be inhibited through the characteristic that the current of a common bridge arm is small, the zero crossing distortion of the system bus voltage is avoided, the system is enabled to operate stably, and the working efficiency is improved. Referring to fig. 6, another embodiment of a modulation method for a three-bridge-arm topology circuit according to the embodiment of the present application includes:
601. when the three-bridge arm topology circuit is in a positive half cycle or a negative half cycle of input voltage, controlling the first switching tube, the second switching tube, the third switching tube, the fourth switching tube, the fifth switching tube and the sixth switching tube to be in a high-frequency state;
when the three-bridge-arm topological circuit is in a positive half cycle or a negative half cycle of input voltage, the first switching tube, the second switching tube, the third switching tube, the fourth switching tube, the fifth switching tube and the sixth switching tube are controlled to be in a high-frequency state, wherein the first switching tube is conducted with the second switching tube in a complementary mode, the third switching tube is conducted with the fourth switching tube in a complementary mode, and the fifth switching tube is conducted with the sixth switching tube in a complementary mode.
602. When the three-bridge arm topological circuit is in the positive half cycle of the input voltage:
1) the first switch tube and the third switch tube are controlled to be conducted at the same time, or the second switch tube and the fourth switch tube are controlled to be conducted at the same time, the first inductor stores energy, the first switch tube and the fourth switch tube are controlled to be conducted at the same time, and the bus capacitor is charged;
in the rectification modulation, when first switch tube and third switch tube simultaneous segment switched on, first input end passes through first inductance in proper order, the body diode of first switch tube, third switch tube and second input end formation current loop, first inductance energy storage, perhaps, when second switch tube and fourth switch tube simultaneous segment switched on, first input end passes through first inductance in proper order, the body diode and the second input end formation current loop of second switch tube, fourth switch tube, first inductance also can the energy storage. When the first switch tube and the fourth switch tube are conducted at the same time, the first input end sequentially passes through the first inductor, the body diode of the first switch tube, the bus capacitor, the body diode of the fourth switch tube and the second input end to form a current loop, and the current loop charges the bus capacitor;
2) the fourth switching tube and the fifth switching tube are controlled to be conducted at the same time, the second inductor stores energy, the fourth switching tube and the sixth switching tube are controlled to be conducted at the same time, or the third switching tube and the fifth switching tube are controlled to be conducted at the same time, and the second inductor realizes follow current;
in the inverter modulation, when the fourth switch tube and the fifth switch tube are switched on simultaneously, a bus capacitor sequentially passes through the fifth switch tube, the second inductor, the first output end, the second output end and the fourth switch tube to form a current loop, the second inductor stores energy, when the fourth switch tube and the sixth switch tube are switched on simultaneously, the second inductor sequentially passes through the first output end, the second output end, the body diodes of the fourth switch tube and the sixth switch tube to form a current loop, and the second inductor realizes follow current, or when the third switch tube and the fifth switch tube are switched on simultaneously, the second inductor sequentially passes through the first output end, the second output end, the body diode of the third switch tube and the fifth switch tube to form a current loop, and the second inductor can also realize follow current.
603. When the three-bridge arm topological circuit is in the negative half cycle of the input voltage:
1) controlling the second switching tube and the fourth switching tube to be conducted at the same time, or controlling the first switching tube and the third switching tube to be conducted at the same time, storing energy by the first inductor, controlling the second switching tube and the third switching tube to be conducted at the same time, and charging the bus capacitor;
in the rectification modulation, when the second switch tube and the fourth switch tube are switched on simultaneously, the second input end sequentially passes through the fourth switch tube, the body diode of the second switch tube, the first inductor and the first input end form a current loop, the first inductor stores energy, or when the first switch tube and the third switch tube are switched on simultaneously, the second input end sequentially passes through the body diode of the third switch tube, the first inductor and the first input end form a current loop, and the first inductor also can store energy. When the second switching tube and the third switching tube are conducted simultaneously, the second input end sequentially passes through the body diode of the third switching tube, the bus capacitor, the body diode of the second switching tube, the first inductor and the first input end to form a current loop, and the current loop charges the bus capacitor;
2) and controlling the third switching tube and the sixth switching tube to be switched on at the same time, storing energy by the second inductor, controlling the third switching tube and the fifth switching tube to be switched on at the same time, or controlling the fourth switching tube and the sixth switching tube to be switched on at the same time, and realizing follow current by the second inductor.
In the inverter modulation, when a third switching tube and a sixth switching tube are conducted simultaneously, a bus capacitor sequentially passes through the third switching tube, a second output end, a first output end, a second inductor and the sixth switching tube to form a current loop, energy is stored in a second inductor, when the third switching tube and a fifth switching tube are conducted simultaneously, the second inductor sequentially passes through a body diode of the fifth switching tube, the third switching tube, the second output end and the first output end to form the current loop, and the second inductor realizes follow current, or when the fourth switching tube and the sixth switching tube are conducted simultaneously, the second inductor sequentially passes through the sixth switching tube, the body diode of the fourth switching tube, the second output end and the first output end to form the current loop, and the second inductor can also realize follow current.
In this embodiment, the six switching tubes are in high frequency state regardless of the positive half cycle or the negative half cycle. By controlling six switching tubes in a high-frequency state in the three-bridge arm topological circuit, input harmonic waves and output harmonic waves can be inhibited, the problem of zero crossing point distortion of system bus voltage is avoided, the system can stably operate, and the working efficiency is improved.
Referring to fig. 7, another embodiment of a modulation method for a three-bridge-arm topology circuit according to the embodiment of the present application includes:
701. when the input voltage is greater than the output voltage and the three-bridge-arm topological circuit is in the positive half cycle or the negative half cycle of the input voltage, controlling the third switching tube, the fourth switching tube, the fifth switching tube and the sixth switching tube to be in a high-frequency state;
and when the input voltage is greater than the output voltage and the three-bridge-arm topological circuit is in the positive half cycle or the negative half cycle of the input voltage, controlling the third switching tube, the fourth switching tube, the fifth switching tube and the sixth switching tube to be in a high-frequency state. And the fifth switching tube is conducted with the sixth switching tube in a complementary manner.
702. When the input voltage is greater than the output voltage and the three-bridge arm topology circuit is in the positive half cycle of the input voltage, controlling the first switch tube to be kept on, and controlling the second switch tube to be kept off:
1) the third switching tube is controlled to be conducted, the first inductor stores energy, the fourth switching tube is controlled to be conducted, and the bus capacitor is charged;
in rectification modulation, when a third switching tube is conducted, a first input end sequentially passes through a first inductor, a body diode of the first switching tube, the third switching tube and a second input end to form a current loop, when the first inductor stores energy, and when a fourth switching tube is conducted, the first input end sequentially passes through the first inductor, the body diode of the first switching tube, a bus capacitor, the body diode of the fourth switching tube and the second input end to form the current loop and charge the bus capacitor;
2) the fourth switching tube and the fifth switching tube are controlled to be conducted at the same time, the second inductor stores energy, the fourth switching tube and the sixth switching tube are controlled to be conducted at the same time, or the third switching tube and the fifth switching tube are controlled to be conducted at the same time, and the second inductor realizes follow current;
in the inverter modulation, when the fourth switch tube and the fifth switch tube are switched on simultaneously, a bus capacitor sequentially passes through the fifth switch tube, the second inductor, the first output end, the second output end and the fourth switch tube to form a current loop, the second inductor stores energy, when the fourth switch tube and the sixth switch tube are switched on simultaneously, the second inductor sequentially passes through the first output end, the second output end, the body diodes of the fourth switch tube and the sixth switch tube to form a current loop, and the second inductor realizes follow current, or when the third switch tube and the fifth switch tube are switched on simultaneously, the second inductor sequentially passes through the first output end, the second output end, the body diode of the third switch tube and the fifth switch tube to form a current loop, and the second inductor can also realize follow current.
703. When the input voltage is greater than the output voltage and the three-bridge arm topology circuit is in the negative half cycle of the input voltage, controlling the first switch tube to be kept off, and controlling the second switch tube to be kept on:
1) controlling the fourth switching tube to be conducted, storing energy by the first inductor, controlling the third switching tube to be conducted, and charging the bus capacitor;
in rectification modulation, when a fourth switching tube is conducted, a second input end sequentially passes through the fourth switching tube, a body diode of the second switching tube, a first inductor and the first input end to form a current loop, the first inductor stores energy, and when the third switching tube is conducted, the second input end sequentially passes through the body diode of the third switching tube, a bus capacitor, the body diode of the second switching tube, the first inductor and the first input end to form a current loop to charge the bus capacitor;
2) the third switching tube and the sixth switching tube are controlled to be conducted at the same time, the second inductor stores energy, the third switching tube and the fifth switching tube are controlled to be conducted at the same time, or the fourth switching tube and the sixth switching tube are controlled to be conducted at the same time, and the second inductor realizes follow current;
in the inverter modulation, when a third switching tube and a sixth switching tube are conducted simultaneously, a bus capacitor sequentially passes through the third switching tube, a second output end, a first output end, a second inductor and the sixth switching tube to form a current loop, energy is stored in a second inductor, when the third switching tube and a fifth switching tube are conducted simultaneously, the second inductor sequentially passes through a body diode of the fifth switching tube, the third switching tube, the second output end and the first output end to form the current loop, and the second inductor realizes follow current, or when the fourth switching tube and the sixth switching tube are conducted simultaneously, the second inductor sequentially passes through the sixth switching tube, the body diode of the fourth switching tube, the second output end and the first output end to form the current loop, and the second inductor can also realize follow current.
In this embodiment, the third switching tube and the fourth switching tube are both in a high frequency state. By controlling at least four switching tubes in the three-bridge arm topological circuit to be in a high-frequency state and combining with the control of other switching tubes in the three-bridge arm topological circuit, the utilization rate of existing devices is high, input harmonic waves and output harmonic waves can be inhibited through the characteristic that the current of a common bridge arm is small, the zero crossing distortion of the system bus voltage is avoided, the system is enabled to operate stably, and the working efficiency is improved.
Referring to fig. 8, another embodiment of a modulation method for a three-bridge-arm topology circuit according to the embodiment of the present application includes:
801. when the input voltage is smaller than the output voltage and the three-bridge-arm topological circuit is in the positive half cycle or the negative half cycle of the input voltage, controlling the first switching tube, the second switching tube, the third switching tube and the fourth switching tube to be in a high-frequency state;
when the input voltage is smaller than the output voltage and the three-bridge-arm topological circuit is in the positive half cycle or the negative half cycle of the input voltage, the first switching tube, the second switching tube, the third switching tube and the fourth switching tube are controlled to be in a high-frequency state. The first switching tube and the second switching tube are conducted in a complementary mode, and the third switching tube and the fourth switching tube are conducted in a complementary mode.
802. When the input voltage is less than the output voltage and the three-bridge arm topology circuit is in the positive half cycle of the input voltage, controlling the fifth switching tube to be kept on, and controlling the sixth switching tube to be kept off:
1) the first switch tube and the third switch tube are controlled to be conducted at the same time, or the second switch tube and the fourth switch tube are controlled to be conducted at the same time, the first inductor stores energy, the first switch tube and the fourth switch tube are controlled to be conducted at the same time, and the bus capacitor is charged;
in the rectification modulation, when first switch tube and third switch tube simultaneous segment switched on, first input end passes through first inductance in proper order, the body diode of first switch tube, third switch tube and second input end formation current loop, first inductance energy storage, perhaps, when second switch tube and fourth switch tube simultaneous segment switched on, first input end passes through first inductance in proper order, the body diode and the second input end formation current loop of second switch tube, fourth switch tube, first inductance also can the energy storage. When the first switch tube and the fourth switch tube are conducted at the same time, the first input end sequentially passes through the first inductor, the body diode of the first switch tube, the bus capacitor, the body diode of the fourth switch tube and the second input end to form a current loop, and the current loop charges the bus capacitor;
2) controlling the fourth switching tube to be conducted, storing energy by the second inductor, controlling the third switching tube to be conducted, and realizing follow current by the second inductor;
in the inverter modulation, when the fourth switching tube is switched on, the bus capacitor sequentially passes through the fifth switching tube, the second inductor, the first output end, the second output end and the fourth switching tube to form a current loop, the second inductor stores energy, when the third switching tube is switched on, the second inductor sequentially passes through the first output end, the second output end, the body diode of the third switching tube and the fifth switching tube to form a current loop, and the second inductor realizes follow current.
803. When the input voltage is less than the output voltage and the three-bridge arm topology circuit is in the negative half cycle of the input voltage, controlling the fifth switching tube to be kept off, and controlling the sixth switching tube to be kept on:
1) the first switch tube and the third switch tube are controlled to be conducted at the same time, or the second switch tube and the fourth switch tube are controlled to be conducted at the same time, the first inductor stores energy, the first switch tube and the fourth switch tube are controlled to be conducted at the same time, and the bus capacitor is charged;
in the rectification modulation, when first switch tube and third switch tube simultaneous segment switched on, first input end passes through first inductance in proper order, the body diode of first switch tube, third switch tube and second input end formation current loop, first inductance energy storage, perhaps, when second switch tube and fourth switch tube simultaneous segment switched on, the second input end passes through fourth switch tube in proper order, the body diode of second switch tube, first inductance and first input end formation current loop, first inductance also can the energy storage. When the first switch tube and the fourth switch tube are conducted at the same time, the first input end sequentially passes through the first inductor, the body diode of the first switch tube, the bus capacitor, the body diode of the fourth switch tube and the second input end to form a current loop, and the current loop charges the bus capacitor;
2) and controlling the third switching tube to be conducted, storing energy by the second inductor, controlling the fourth switching tube to be conducted, and realizing follow current by the second inductor.
In the inverter modulation, when a third switching tube is conducted, a bus capacitor sequentially passes through the third switching tube, a second output end, a first output end, a second inductor and a sixth switching tube to form a current loop, the second inductor stores energy, when a fourth switching tube is conducted, the second inductor sequentially passes through a body diode of the sixth switching tube, the fourth switching tube, the second output end and the first output end to form the current loop, and the second inductor realizes follow current.
In this embodiment, the third switching tube and the fourth switching tube are both in a high frequency state. By controlling at least four switching tubes in the three-bridge arm topological circuit to be in a high-frequency state and combining with the control of other switching tubes in the three-bridge arm topological circuit, the utilization rate of existing devices is high, input harmonic waves and output harmonic waves can be inhibited through the characteristic that the current of a common bridge arm is small, the zero crossing distortion of the system bus voltage is avoided, the system is enabled to operate stably, and the working efficiency is improved.
It is clear to those skilled in the art that, for convenience and brevity of description, the specific working process of the circuit described above may refer to the corresponding process in the foregoing method embodiment, and is not described herein again.
In the several embodiments provided in the present application, it should be understood that the disclosed circuits and methods may be implemented in other ways. For example, the embodiments described above are merely illustrative, e.g., multiple units or components may be combined or integrated into another system, or some features may be omitted, or not implemented.
The above are preferred embodiments of the present invention, and all changes made according to the technical scheme of the present invention that produce functional effects do not exceed the scope of the technical scheme of the present invention belong to the protection scope of the present invention.

Claims (10)

1. A modulation method of a three-bridge arm topological circuit is characterized by comprising the following steps:
in each half cycle of input voltage, controlling at least four switching tubes of a three-bridge arm topological circuit to be in a high-frequency state, wherein the high-frequency state is a state with on-off frequency of kilohertz level, the three-bridge arm topological circuit comprises a first bridge arm, a second bridge arm and a third bridge arm, the first bridge arm is a power factor correction bridge arm formed by a first switching tube and a second switching tube, the second bridge arm is a common bridge arm formed by a third switching tube and a fourth switching tube, the third bridge arm is an inversion bridge arm formed by a fifth switching tube and a sixth switching tube, the three bridge arms are respectively connected in parallel between a positive bus and a negative bus, a bus is connected in parallel between the positive bus and the negative bus, the positive pole of the bus capacitor is connected with the positive bus, the midpoint of the first bridge arm is connected with the first input end of the three-bridge arm topological circuit through a first inductor, and the midpoint of the third bridge arm is connected with the first output end of the three-bridge arm topological circuit through a second inductor, a second output end of the three-bridge-arm topological circuit is connected with a second input end of the three-bridge-arm topological circuit through the midpoint of the second bridge arm;
and carrying out rectification modulation and inversion modulation on the three-bridge arm topological circuit through a switching tube of the three-bridge arm topological circuit.
2. The modulation method of the three-arm topology circuit according to claim 1, wherein the switching tubes of at least four three-arm topology circuits are controlled to be in a high frequency state in each half cycle of the input voltage, comprising:
and in each half period of the input voltage, controlling the switching tubes of at least four three-bridge arm topological circuits to be in a high-frequency state by a pulse width modulation method.
3. The modulation method of the three-arm topology circuit according to claim 1, wherein the switching tubes of at least four three-arm topology circuits are controlled to be in a high frequency state in each half cycle of the input voltage, comprising:
when the three-bridge-arm topology circuit is in the positive half cycle or the negative half cycle of the input voltage, the first switch tube, the second switch tube, the fifth switch tube and the sixth switch tube are controlled to be in a high-frequency state, the first switch tube and the second switch tube are conducted in a complementary mode, and the fifth switch tube and the sixth switch tube are conducted in a complementary mode.
4. The modulation method of the three-bridge-arm topology circuit according to claim 2, wherein the rectification modulation and the inversion modulation are performed on the three-bridge-arm topology circuit through a switching tube of the three-bridge-arm topology circuit, and the modulation method comprises the following steps:
when the three-bridge-arm topology circuit is in the positive half cycle of the input voltage, controlling the third switching tube to be kept off, and controlling the fourth switching tube to be kept on:
the second switching tube is controlled to be conducted, the first inductor stores energy, the first switching tube is controlled to be conducted, and the bus capacitor is charged;
the fifth switching tube is controlled to be conducted, the second inductor stores energy, the sixth switching tube is controlled to be conducted, and the second inductor realizes follow current;
when the three-bridge-arm topology circuit is in the negative half cycle of the input voltage, controlling the third switching tube to be kept on, and controlling the fourth switching tube to be kept off:
the first switch tube is controlled to be conducted, the first inductor stores energy, the second switch tube is controlled to be conducted, and the bus capacitor is charged;
and controlling the sixth switching tube to be conducted, storing energy by the second inductor, controlling the fifth switching tube to be conducted, and realizing follow current by the second inductor.
5. The modulation method of the three-arm topology circuit according to claim 1, wherein the switching tubes of at least four three-arm topology circuits are controlled to be in a high frequency state in each half cycle of the input voltage, comprising:
when the input voltage is greater than the output voltage and the three-bridge-arm topological circuit is in the positive half cycle of the input voltage, controlling the third switching tube, the fourth switching tube, the fifth switching tube and the sixth switching tube to be in a high-frequency state, wherein the third switching tube and the fourth switching tube are conducted in a complementary mode, and the fifth switching tube and the sixth switching tube are conducted in a complementary mode;
when the input voltage is greater than the output voltage and the three-bridge-arm topological circuit is in the negative half cycle of the input voltage, controlling the first switching tube, the second switching tube, the fifth switching tube and the sixth switching tube to be in a high-frequency state, wherein the first switching tube and the second switching tube are conducted in a complementary mode, and the fifth switching tube and the sixth switching tube are conducted in a complementary mode;
when the input voltage is smaller than the output voltage and the three-bridge-arm topological circuit is in the positive half cycle of the input voltage, controlling the first switch tube, the second switch tube, the third switch tube and the fourth switch tube to be in a high-frequency state, wherein the first switch tube and the second switch tube are conducted in a complementary mode, and the third switch tube and the fourth switch tube are conducted in a complementary mode;
when the input voltage is smaller than the output voltage and the three-bridge-arm topological circuit is in the negative half cycle of the input voltage, the first switch tube, the second switch tube, the fifth switch tube and the sixth switch tube are controlled to be in a high-frequency state, the first switch tube and the second switch tube are conducted in a complementary mode, and the fifth switch tube and the sixth switch tube are conducted in a complementary mode.
6. The modulation method of the three-arm topology circuit according to claim 4, wherein the rectification modulation and the inversion modulation are performed on the three-arm topology circuit through a switching tube of the three-arm topology circuit, and the modulation method comprises:
when the input voltage is greater than the output voltage and the three-bridge arm topology circuit is in the positive half cycle of the input voltage, controlling the first switch tube to be kept on, and controlling the second switch tube to be kept off:
the third switching tube is controlled to be conducted, the first inductor stores energy, the fourth switching tube is controlled to be conducted, and the bus capacitor is charged;
the fourth switching tube and the fifth switching tube are controlled to be conducted at the same time, the second inductor stores energy, the fourth switching tube and the sixth switching tube are controlled to be conducted at the same time, or the third switching tube and the fifth switching tube are controlled to be conducted at the same time, and the second inductor realizes follow current;
when the input voltage is greater than the output voltage and the three-bridge-arm topological circuit is in the negative half cycle of the input voltage, controlling the third switching tube to be kept on, and controlling the fourth switching tube to be kept off:
the first switch tube is controlled to be conducted, the first inductor stores energy, the second switch tube is controlled to be conducted, and the bus capacitor is charged;
the sixth switching tube is controlled to be conducted, the second inductor stores energy, the fifth switching tube is controlled to be conducted, and the second inductor realizes follow current;
when the input voltage is less than the output voltage and the three-bridge arm topology circuit is in the positive half cycle of the input voltage, controlling the fifth switching tube to be kept on, and controlling the sixth switching tube to be kept off:
the first switch tube and the third switch tube are controlled to be conducted at the same time, or the second switch tube and the fourth switch tube are controlled to be conducted at the same time, the first inductor stores energy, the first switch tube and the fourth switch tube are controlled to be conducted at the same time, and the bus capacitor is charged;
controlling the fourth switching tube to be conducted, storing energy by the second inductor, controlling the third switching tube to be conducted, and realizing follow current by the second inductor;
when the input voltage is smaller than the output voltage and the three-bridge-arm topological circuit is in the negative half cycle of the input voltage, controlling the third switching tube to be kept on, and controlling the fourth switching tube to be kept off:
the first switch tube is controlled to be conducted, the first inductor stores energy, the second switch tube is controlled to be conducted, and the bus capacitor is charged;
and controlling the sixth switching tube to be conducted, storing energy by the second inductor, controlling the fifth switching tube to be conducted, and realizing follow current by the second inductor.
7. The modulation method of the three-arm topology circuit according to claim 1, wherein the switching tubes of at least four three-arm topology circuits are controlled to be in a high frequency state in each half cycle of the input voltage, comprising:
when the three-bridge arm topology circuit is in a positive half cycle or a negative half cycle of input voltage, the first switching tube, the second switching tube, the third switching tube, the fourth switching tube, the fifth switching tube and the sixth switching tube are controlled to be in a high-frequency state, the first switching tube and the second switching tube are conducted in a complementary mode, the third switching tube and the fourth switching tube are conducted in a complementary mode, and the fifth switching tube and the sixth switching tube are conducted in a complementary mode.
8. The modulation method of the three-arm topology circuit according to claim 6, wherein the rectification modulation and the inversion modulation are performed on the three-arm topology circuit through a switching tube of the three-arm topology circuit, and the modulation method comprises:
when the three-bridge arm topological circuit is in the positive half cycle of the input voltage:
the first switch tube and the third switch tube are controlled to be conducted at the same time, or the second switch tube and the fourth switch tube are controlled to be conducted at the same time, the first inductor stores energy, the first switch tube and the fourth switch tube are controlled to be conducted at the same time, and the bus capacitor is charged;
the fourth switching tube and the fifth switching tube are controlled to be conducted at the same time, the second inductor stores energy, the fourth switching tube and the sixth switching tube are controlled to be conducted at the same time, or the third switching tube and the fifth switching tube are controlled to be conducted at the same time, and the second inductor realizes follow current;
when the three-bridge arm topological circuit is in the negative half cycle of the input voltage:
controlling the second switching tube and the fourth switching tube to be conducted at the same time, or controlling the first switching tube and the third switching tube to be conducted at the same time, storing energy by the first inductor, controlling the second switching tube and the third switching tube to be conducted at the same time, and charging the bus capacitor;
and controlling the third switching tube and the sixth switching tube to be switched on at the same time, storing energy by the second inductor, controlling the third switching tube and the fifth switching tube to be switched on at the same time, or controlling the fourth switching tube and the sixth switching tube to be switched on at the same time, and realizing follow current by the second inductor.
9. The modulation method of the three-arm topology circuit according to claim 1, wherein the switching tubes of at least four three-arm topology circuits are controlled to be in a high frequency state in each half cycle of the input voltage, comprising:
when the input voltage is greater than the output voltage and the three-bridge-arm topological circuit is in the positive half cycle or the negative half cycle of the input voltage, controlling the third switching tube, the fourth switching tube, the fifth switching tube and the sixth switching tube to be in a high-frequency state, wherein the third switching tube and the fourth switching tube are conducted in a complementary mode, and the fifth switching tube and the sixth switching tube are conducted in a complementary mode;
when the input voltage is smaller than the output voltage and the three-bridge-arm topological circuit is in the positive half cycle or the negative half cycle of the input voltage, the first switch tube, the second switch tube, the third switch tube and the fourth switch tube are controlled to be in a high-frequency state, the first switch tube and the second switch tube are conducted in a complementary mode, and the third switch tube and the fourth switch tube are conducted in a complementary mode.
10. The modulation method of the three-arm topology circuit according to claim 8, wherein the rectification modulation and the inversion modulation are performed on the three-arm topology circuit through a switching tube of the three-arm topology circuit, and the modulation method comprises:
when the input voltage is greater than the output voltage and the three-bridge arm topology circuit is in the positive half cycle of the input voltage, controlling the first switch tube to be kept on, and controlling the second switch tube to be kept off:
the third switching tube is controlled to be conducted, the first inductor stores energy, the fourth switching tube is controlled to be conducted, and the bus capacitor is charged;
the fourth switching tube and the fifth switching tube are controlled to be conducted at the same time, the second inductor stores energy, the fourth switching tube and the sixth switching tube are controlled to be conducted at the same time, or the third switching tube and the fifth switching tube are controlled to be conducted at the same time, and the second inductor realizes follow current;
when the input voltage is greater than the output voltage and the three-bridge arm topology circuit is in the negative half cycle of the input voltage, controlling the first switch tube to be kept off, and controlling the second switch tube to be kept on:
controlling the fourth switching tube to be conducted, storing energy by the first inductor, controlling the third switching tube to be conducted, and charging the bus capacitor;
the third switching tube and the sixth switching tube are controlled to be conducted at the same time, the second inductor stores energy, the third switching tube and the fifth switching tube are controlled to be conducted at the same time, or the fourth switching tube and the sixth switching tube are controlled to be conducted at the same time, and the second inductor realizes follow current;
when the input voltage is less than the output voltage and the three-bridge arm topology circuit is in the positive half cycle of the input voltage, controlling the fifth switching tube to be kept on, and controlling the sixth switching tube to be kept off:
the first switch tube and the third switch tube are controlled to be conducted at the same time, or the second switch tube and the fourth switch tube are controlled to be conducted at the same time, the first inductor stores energy, the first switch tube and the fourth switch tube are controlled to be conducted at the same time, and the bus capacitor is charged;
controlling the fourth switching tube to be conducted, storing energy by the second inductor, controlling the third switching tube to be conducted, and realizing follow current by the second inductor;
when the input voltage is less than the output voltage and the three-bridge arm topology circuit is in the negative half cycle of the input voltage, controlling the fifth switching tube to be kept off, and controlling the sixth switching tube to be kept on:
the first switch tube and the third switch tube are controlled to be conducted at the same time, or the second switch tube and the fourth switch tube are controlled to be conducted at the same time, the first inductor stores energy, the first switch tube and the fourth switch tube are controlled to be conducted at the same time, and the bus capacitor is charged;
and controlling the third switching tube to be conducted, storing energy by the second inductor, controlling the fourth switching tube to be conducted, and realizing follow current by the second inductor.
CN202111327883.3A 2021-11-10 2021-11-10 Modulation method of three-bridge-arm topological circuit Pending CN114172385A (en)

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CN106602888A (en) * 2016-11-30 2017-04-26 漳州科华技术有限责任公司 Three-bridge-arm topology circuit, control method and uninterruptible power supply
WO2018107619A1 (en) * 2016-12-15 2018-06-21 广东百事泰电子商务股份有限公司 Pfc and llc resonance-based intelligent full-bridge sine-wave voltage conversion circuit

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CN103944412A (en) * 2014-04-14 2014-07-23 华为技术有限公司 Control method and device for UPS and UPS
CN106602888A (en) * 2016-11-30 2017-04-26 漳州科华技术有限责任公司 Three-bridge-arm topology circuit, control method and uninterruptible power supply
WO2018107619A1 (en) * 2016-12-15 2018-06-21 广东百事泰电子商务股份有限公司 Pfc and llc resonance-based intelligent full-bridge sine-wave voltage conversion circuit

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