CN-114865937-B - Dual-mode inverter power supply and control method

Abstract

The invention provides a dual-mode inverter power supply and a control method, wherein the inverter power supply comprises a three-phase rectifier bridge, an inverter module, a switch module, an output module, a detection conditioning circuit and a main control module, wherein the detection conditioning circuit is used for respectively detecting real-time voltage of each output end in the output module, the main control module is used for controlling the working state of the inverter module according to the real-time voltage of each output end, so that the inverter module can convert direct current into single-phase alternating current and three-phase alternating current with the same output power at the same time, and is also used for controlling the switch state of the switch module so that the output mode of the output module is switched between a single-phase mode and a three-phase mode.

Inventors

• YU SHUN

Assignees

• 重庆新颜达机电设备有限公司

Dates

Publication Date

20260512

Application Date

20220527

Claims (8)

1. 1. A dual mode inverter power supply, the inverter power supply comprising: the three-phase rectifier bridge, the inverter module, the switch module, the output module, the detection conditioning circuit and the main control module; the input end of the three-phase rectifier bridge is connected with a three-phase generator when in use and is used for converting three-phase alternating current output by the three-phase generator into direct current; The input end of the inversion module is connected with the output end of the three-phase rectifier bridge, the output end of the inversion module is connected with the input end of the output module through the switch module, and the output end of the output module is connected with a rear-stage load when in use; the input end of the detection conditioning circuit is connected with the output end of the output module and is used for respectively detecting the real-time voltage of each output end in the output module; The main control module is respectively connected with the output end of the detection conditioning circuit, the control end of the inversion module and the control end of the switch module, and is used for controlling the working state of the inversion module according to the real-time voltage of each output end so that the inversion module can convert the direct current into single-phase alternating current and three-phase alternating current with the same output power at the same time; the switch module includes: A first relay and a second relay; The control end of the first relay and the control end of the second relay are respectively connected with the main control module, the first end of the switch of the first relay is connected with the first output end of the inversion module, the second end of the switch of the first relay is connected with the second output end of the inversion module, the first end of the switch of the second relay is connected with the second output end of the inversion module, the second end of the switch of the second relay is connected with the third output end of the inversion module, and the second end of the switch of the second relay is also connected with the live wire output end of the output module; The inversion module includes: The first bridge arm unit, the second bridge arm unit, the third bridge arm unit, the fourth bridge arm unit, the fifth bridge arm unit and the sixth bridge arm unit; The input end of the first bridge arm unit, the input end of the second bridge arm unit, the input end of the third bridge arm unit, the input end of the fourth bridge arm unit, the input end of the fifth bridge arm unit and the input end of the sixth bridge arm unit are respectively connected with the output end of the three-phase rectifier bridge; The output end of the first bridge arm unit is connected with the A-phase output end, the output end of the second bridge arm unit is connected with the B-phase output end, the output end of the third bridge arm unit is connected with the C-phase output end, the output end of the fourth bridge arm unit, the output end of the fifth bridge arm unit and the output end of the sixth bridge arm unit are respectively connected with the neutral line output end, wherein the output end of the first bridge arm unit is the first output end of the inversion module, the output end of the second bridge arm unit is the second output end of the inversion module, and the output of the third bridge arm unit is the third output end of the inversion module.
2. 2. The dual mode inverter power supply of claim 1, wherein the inverter module further comprises: The first filter inductor, the second filter inductor, the third filter inductor and the fourth filter inductor; The first end of the first filter inductor is connected with the output end of the first bridge arm unit, the second end of the first filter inductor is connected with the A-phase output end, the first end of the second filter inductor is connected with the output end of the second bridge arm unit, the second end of the second filter inductor is connected with the B-phase output end, the first end of the third filter inductor is connected with the output end of the third bridge arm unit, the second end of the third filter inductor is connected with the C-phase output end, the first end of the fourth filter inductor is connected with the output end of the fourth bridge arm unit, and the second end of the fourth filter inductor is connected with the neutral line output end.
3. 3. The dual mode inverter of claim 2, wherein each leg unit comprises: an upper arm switching tube and a lower arm switching tube; the drain electrode of the upper arm switching tube is connected with the first output end of the three-phase rectifier bridge, the grid electrode of the upper arm switching tube is connected with the main control module, the source electrode of the upper arm switching tube is connected with the drain electrode of the lower arm switching tube, the grid electrode of the lower arm switching tube is connected with the main control module, and the source electrode of the lower arm switching tube is connected with the second output end of the three-phase rectifier bridge; the source electrode of the upper arm switch tube is the output end of each bridge arm unit.
4. 4. The dual mode inverter power supply of claim 1, wherein the output module further comprises: the first filter capacitor, the second filter capacitor and the third filter capacitor; The first end of the first filter capacitor is connected with the A-phase output end, the first end of the second filter capacitor is connected with the B-phase output end, the first end of the third filter capacitor is connected with the C-phase output end, and the second ends of the first filter capacitor, the second filter capacitor and the third filter capacitor are respectively connected with the neutral line output end.
5. 5. The dual mode inverter of claim 1, wherein the a-phase output, the B-phase output, and the C-phase output are respectively connected to a three-phase load when the output module is in a three-phase mode of operation; Or/and, when the output module is in a three-phase operation mode, the a-phase output end is connected with a first end of a first single-phase load, the B-phase output end is connected with a first end of a second single-phase load, the C-phase output end is connected with a first end of a third single-phase load, and the second ends of the first single-phase load, the second single-phase load and the third single-phase load are connected with the neutral line output end; When the output module is in a single-phase operation mode, the live wire output end is connected with the first end of the fourth single-phase load, and the neutral wire output end is connected with the second end of the fourth single-phase load.
6. 6. A control method based on the dual mode inverter of any one of claims 1 to 5, characterized in that the control method comprises: the main control module controls the switch state of the switch module to enable the output mode of the output module to be switched between a single-phase mode and a three-phase mode, so that the current output mode is obtained; the detection conditioning circuit detects the real-time voltage of each output end in the output module in the current output mode; the main control module generates corresponding three-phase sine reference signals according to the real-time voltage of each output end; The main control module compares each phase of sinusoidal reference signal with a preset triangular carrier signal, and controls the working state of the inversion module according to the comparison result, so that the inversion module converts direct current into single-phase alternating current and three-phase alternating current with the same output power at the same time, and the single-phase alternating current or the three-phase alternating current supplies power for different back-stage loads.
7. 7. The control method of a dual-mode inverter of claim 6, wherein when the inverter module includes a plurality of bridge arm units, each bridge arm unit includes an upper arm switching tube and a lower arm switching tube, the main control module compares each phase sinusoidal reference signal with a preset triangular carrier signal, and controls the working state of the inverter module according to the comparison result, comprising: If the current phase sine reference signal is larger than the triangular carrier signal, the main control module controls the upper arm switching tube to be conducted and the lower arm switching tube to be disconnected; and if the current phase sinusoidal reference signal is smaller than the triangular carrier signal, the main control module controls the upper arm switching tube to be disconnected and the lower arm switching tube to be connected.
8. 8. The control method of a dual-mode inverter power supply of claim 7, wherein when the inverter module includes a first leg unit, a second leg unit, a third leg unit, a fourth leg unit, a fifth leg unit, and a sixth leg unit, and when the sinusoidal signal is greater than zero, three lower arm switching tubes of the fourth leg unit, the fifth leg unit, and the sixth leg unit are simultaneously turned on, and three upper arm switching tubes of the fourth leg unit, the fifth leg unit, and the sixth leg unit are simultaneously turned off.

Description

Dual-mode inverter power supply and control method Technical Field The invention relates to the technical field of power supply control, in particular to a dual-mode inverter power supply and a control method. Background At present, when a three-phase generator is used as a power supply to directly supply power to a load at a later stage, the voltage of an output end of the three-phase generator can be reduced along with the increase of the load, and the problem of unstable output voltage occurs. Meanwhile, when the three-phase generator supplies power to the single-phase load, the output capacity of the three-phase generator is only one third of the rated capacity of the generator, and the power supply requirement of the large-capacity single-phase load cannot be met. Therefore, the three-phase generator in the prior art has the problems that the power supply is unstable and the power supply requirement of a large-capacity single-phase load cannot be met. Disclosure of Invention Aiming at the defects existing in the prior art, the dual-mode inverter power supply and the control method provided by the invention solve the problems that in the prior art, a three-phase generator is unstable in power supply and cannot meet the power supply requirement of a large-capacity single-phase load. The invention provides a dual-mode inverter power supply, which comprises a three-phase rectifier bridge, an inverter module, a switch module, an output module, a detection conditioning circuit and a main control module, wherein the input end of the three-phase rectifier bridge is connected with a three-phase generator when in use and is used for converting three-phase alternating current output by the three-phase generator into direct current, the input end of the inverter module is connected with the output end of the three-phase rectifier bridge, the output end of the inverter module is connected with the input end of the output module through the switch control module, the output end of the output module is connected with a rear-stage load when in use, the output module comprises an A-phase output end, a B-phase output end, a C-phase output end, a neutral line output end and a fire wire output end, the input end of the detection conditioning circuit is connected with the output end of the output module and is used for respectively detecting real-time voltage of each output end of the output module, the main control module is respectively connected with the output end of the detection conditioning circuit, the control end of the inverter module and the control end of the switch module, and is used for controlling the three-phase alternating current to be in real-time mode according to the output voltage of each output end of the detection conditioning circuit, and the control end of the three-phase alternating current is used for enabling the three-phase alternating current to be converted into the same as the three-phase power module and the real-phase power to be in a real-time mode when the inverter module is used for outputting the same. Optionally, the switch module comprises a first relay and a second relay, wherein the control end of the first relay and the control end of the second relay are respectively connected with the main control module, the first end of the switch of the first relay is connected with the first output end of the inversion module, the second end of the switch of the first relay is connected with the second output end of the inversion module, the first end of the switch of the second relay is connected with the second output end of the inversion module, the second end of the switch of the second relay is connected with the third output end of the inversion module, and the second end of the switch of the second relay is also connected with the live wire output end of the output module. The inverter module comprises a first bridge arm unit, a second bridge arm unit, a third bridge arm unit, a fourth bridge arm unit, a fifth bridge arm unit and a sixth bridge arm unit, wherein the input end of the first bridge arm unit, the input end of the second bridge arm unit, the input end of the third bridge arm unit, the input end of the fourth bridge arm unit, the input end of the fifth bridge arm unit and the input end of the sixth bridge arm unit are respectively connected with the output end of the three-phase rectifier, the output end of the first bridge arm unit is connected with the output end of an A phase, the output end of the second bridge arm unit is connected with the output end of a B phase, the output end of the third bridge arm unit is connected with the output end of a C phase, the output end of the fourth bridge arm unit, the output end of the fifth bridge arm unit and the output end of the sixth bridge arm unit are respectively connected with the output end of a neutral line, the output end of the first bridge arm unit is the first output end of the inverter module, the output end of the