Detection method of three-phase inverter output line voltage

A voltage detection method and a three-phase inverter technology, which are applied in voltage/current isolation, current/voltage measurement, instruments, etc., can solve the problems of many megohm-level resistances, slow response speed, and high cost, and achieve fast response speed , low cost, low cost effect

Inactive Publication Date: 2012-05-02
HEFEI SOLARWAY ENERGY TECH
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  • Application Information

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Problems solved by technology

[0003] 1. Use megohm-level resistors and operational amplifiers for differential sampling; this method is low in cost, but there are too many megohm-level resistors and the response speed is slow
[0004] 2. Sampling with a linear optocoupler; the response speed is fast, but the cost is high
[0005] 3. Sampling with Hall voltage sensor; the response speed is fast, but the cost is high

Method used

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  • Detection method of three-phase inverter output line voltage
  • Detection method of three-phase inverter output line voltage
  • Detection method of three-phase inverter output line voltage

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Embodiment Construction

[0042] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0043] The method for detecting the output line voltage of the three-phase inverter according to the present invention uses an ordinary switch-type photocoupler and a resistance voltage divider unit to form a three-phase inverter output line voltage detection circuit to detect the output line voltage of the three-phase inverter. It not only has a faster response speed, but also has the advantage of lower cost.

[0044] On the basis of the above technical solutions, such as figure 1 As shown, the three-phase inverter output line voltage detection circuit includes:

[0045] The resistance voltage divider unit connected between the output phase voltage U and the output phase voltage V of the three-phase inverter, the photocoupler, the filter amplifier circuit on the secondary side of the photocoupler, and the signal shaping circuit of the subsequent stage;

[...

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Abstract

The invention relates to the three-phase inverter output line voltage detection technology, concretely relating to a detection method of three-phase inverter output line voltage. A common switching mode optoelectronic coupler and a resistance dividing potential drop unit are employed to form a three-phase inverter output line voltage detection circuit to detect the three-phase inverter output line voltage. The three-phase inverter output line voltage detection circuit comprises the resistance dividing potential drop unit between output terminals of a three-phase inverter, the optoelectronic coupler and a filtering amplification circuit at a secondary edge of the optoelectronic coupler. The method in the invention is very suitable for detection of a PWM voltage waveform and has the advantages of photoelectric isolation, low cost, high response speed and capability of satisfying a requirement of three-phase inverter output line voltage detection.

Description

technical field [0001] The invention relates to a three-phase inverter output line voltage detection technology, in particular to a three-phase inverter output line voltage detection method. In particular, the invention relates to a detection circuit which needs to phase-lock the frequency of the output line voltage of the three-phase inverter. Background technique [0002] In some applications of three-phase inverters, real-time detection of the output three-phase AC line voltage is required to achieve control needs. There are basically three existing methods: [0003] 1. Use megohm-level resistors and operational amplifiers for differential sampling; this method is low in cost, but there are too many megohm-level resistors and the response speed is slow. [0004] 2. Sampling with a linear optocoupler; the response speed is fast, but the cost is high. [0005] 3. Use Hall voltage sensor for sampling; the response speed is fast, but the cost is high. Contents of the inve...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R19/00G01R15/14
Inventor 蒋劲松陈建斌
Owner HEFEI SOLARWAY ENERGY TECH
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