Inverter Power Supply System

Patent metadata

Field	Value
Publication number	US-2016111968-A1
Application number	US-201514980441-A
Country	US
Kind code	A1
Filing date	Dec 28, 2015
Priority date	Jun 18, 2014
Publication date	Apr 21, 2016
Grant date	—

Abstract

An inverter power supply system includes an inverter circuit and a feedback circuit, where the inverter circuit is configured to convert a first alternating current voltage into a second alternating current voltage, and convert a first alternating current into a second alternating current; the feedback circuit determines whether a value of the second alternating current voltage exceeds a preset threshold; and when the value of the second alternating current voltage exceeds the preset threshold, the feedback circuit acquires a feedback current, compensates for a reference value of the first alternating current according to the feedback current, generates a control signal according to a reference value, after compensation, of the first alternating current, and outputs the control signal to the inverter circuit to adjust the value of the second alternating current voltage.

First claim

What is claimed is:

1 . An inverter power supply system, comprising:
an inverter circuit; and a feedback circuit, wherein the inverter circuit is configured to convert a first alternating current voltage into a second alternating current voltage and convert a first alternating current into a second alternating current, wherein the feedback circuit determines whether a value of the second alternating current voltage exceeds a preset threshold, and wherein, when the value of the second alternating current voltage exceeds the preset threshold, the feedback circuit acquires a feedback current, compensates for a reference value of the first alternating current according to the feedback current, generates a control signal according to the reference value, after compensation, of the first alternating current, and outputs the control signal to the inverter circuit to adjust the value of the second alternating current voltage.

2 . The inverter power supply system according to claim 1 , wherein the inverter circuit comprises:
an alternating current power supply; a rectifier; and an inverter, wherein the alternating current power supply generates the first alternating current voltage and the first alternating current, wherein the rectifier is configured to convert the first alternating current voltage and the first alternating current into a first direct current voltage and a first direct current respectively, wherein the inverter is connected to the rectifier by a first direct current bus and a second direct current bus, and wherein the inverter is configured to convert the first direct current voltage and the first direct current into the second alternating current voltage and the second alternating current respectively.

3 . The inverter power supply system according to claim 2 , wherein the feedback circuit comprises:
a detection unit; and a rectifier control unit, wherein the detection unit is connected to the inverter circuit, detects a signal output by the inverter circuit, and outputs a detection result, wherein the rectifier control unit receives the detection result, wherein the detection result comprises the value of the second alternating current voltage, and wherein the rectifier control unit is configured to determine, according to the detection result, whether the value of the second alternating current voltage exceeds the preset threshold.

4 . The inverter power supply system according to claim 3 , wherein the rectifier control unit comprises:
a determining unit; a sample data processing unit; and a loop control and wave-making unit, wherein the detection result further comprises a value of the first alternating current voltage, a value of the second alternating current, a value of a voltage of the first direct current bus, and a value of a voltage of the second direct current bus, wherein the determining unit is configured to receive the second alternating current voltage output by the detection unit and determine whether the value of the second alternating current voltage exceeds the preset threshold, wherein, when the value of the second alternating current voltage exceeds the preset threshold, the determining unit sends an enabling signal to the sample data processing unit, wherein the sample data processing unit performs calculation on the first alternating current voltage, the second alternating current voltage, and the second alternating current that are output by the detection unit, to obtain the feedback current, and sends the feedback current to the loop control and wave-making unit, and wherein the loop control and wave-making unit compensates for the reference value, which is prestored in the loop control and wave-making unit, of the first alternating current using the feedback current and generates the control signal according to the reference value, after compensation, of the first alternating current.

5 . The inverter power supply system according to claim 4 , wherein the reference value of the first alternating current is obtained through calculation using a function based on differences obtained by subtracting the voltage of the first direct current bus and the voltage of the second direct current bus from a reference value of the voltage of the first direct current bus and a reference value of the voltage of the second direct current bus respectively, wherein the reference value of the voltage of the first direct current bus and the reference value of the voltage of the second direct current bus are preset constants, and wherein the function is an integral function or a product function.

6 . The inverter power supply system according to claim 4 , wherein obtaining, by the sample data processing unit, the feedback current according to the first alternating current voltage, the second alternating current voltage, and the second alternating current comprises calculating an active component modulus value of the second alternating current voltage and the second alternating current, performing coordinate transformation on the first alternating current voltage, and obtaining the feedback current according to data obtained by calculating the active component modulus value of the second alternating current voltage and the second alternating current and data obtained by performing the coordinate transformation on the first alternating current voltage.

7 . The inverter power supply system according to claim 2 , wherein the control signal is configured to adjust a value of the first direct current voltage output by the rectifier, to adjust the second alternating current voltage output by the rectifier.

8 . The inverter power supply system according to claim 2 , wherein the inverter power supply system further comprises a first capacitor and a second capacitor, wherein one end of the first capacitor is electrically connected to the first direct current bus and the other end is grounded, and wherein one end of the second capacitor is connected to the second direct current bus and the other end is grounded.

9 . The inverter power supply system according to claim 2 , wherein the alternating current power supply comprises a first output end, a second output end, a third output end, and a first common end, wherein the first alternating current voltage is a three-phase alternating current voltage, which comprises a first-phase alternating current voltage, a second-phase alternating current voltage, and a third-phase alternating current voltage, wherein the first-phase alternating current voltage, the second-phase alternating current voltage, and the third-phase alternating current voltage have a same voltage amplitude and sequentially differ by a phase difference of 120°, wherein the first alternating current is a three-phase alternating current, which comprises a first-phase alternating current, a second-phase alternating current, and a third-phase alternating current, wherein the first-phase alternating current, the second-phase alternating current, and the third-phase alternating current have a same current amplitude and sequentially differ by a phase difference of 120°, wherein the first-phase alternating current voltage and the first-phase alternating current are output through the first output end and the first common end, wherein the second-phase alternating current voltage and the second-phase alternating current are output through the second output end and the first common end, and wherein the third-phase alternating current voltage and the third-phase alternating current are output through the third output end and the first common end.

10 . The inverter power supply system according to claim 9 , wherein the inverter power supply system further comprises a first indu

Assignees

• Huawei Tech Co Ltd

Inventors

• Zou Jianlong
• Liang Xianghui
• Liu Yongqiao

Classifications

• H02M5/458 Primary

  using semiconductor devices only · CPC title

• H02M5/4585 Primary

  having a rectifier with controlled elements · CPC title

• H02M1/0019

  the disturbance parameters being load current fluctuations · CPC title

• H02M1/32

  Means for protecting converters other than automatic disconnection · CPC title

• H02M1/0025

  Arrangements for modifying reference values, feedback values or error values in the control loop of a converter · CPC title