Frequency doubling single-resistor current sampling method and device

A current sampling and single-resistor technology, applied in the field of single-resistor current sampling, can solve the problem of low sampling accuracy of current signals, and achieve the effect of improving the accuracy of current sampling
CN113671241APending Publication Date: 2021-11-19SHANGHAI STEP ELECTRIC
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Patent Information

Authority / Receiving Office
CN ยท China
Patent Type
Applications(China)
Current Assignee / Owner
SHANGHAI STEP ELECTRIC
Publication Date
2021-11-19

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Abstract

The invention discloses a frequency doubling single-resistor current sampling method and device. The method comprises the following steps of a, adjusting a three-phase duty ratio calculated by a PWM control algorithm, and obtaining the adjusted three-phase duty ratio, b, calculating current sampling moments ts1, ts2, ts3 and ts4 according to the adjusted three-phase duty ratio, c, outputting a three-phase voltage according to the adjusted three-phase duty ratio, and d, conducting current sampling at the current sampling moments ts1, ts2, ts3 and ts4, reconstructing three-phase currents of the first half period and the second half period of the carrier period according to current sampling results, and then acquiring the three-phase average current of the carrier period. The current sampling precision of the single-resistor current sampling method can be improved.
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Description

technical field

[0001] The invention relates to single-resistance current sampling technology. Background technique

[0002] The frequency converter is generally a three-phase output and is used to control a three-phase AC motor. Inverters generally require three-phase current signals to realize motor control, and at the same time, protection of the inverter and the motor must also be realized based on the three-phase current signals. There are many ways to obtain the three-phase current signal. Obtaining the current signal through the sampling resistor is a common current sampling method. According to the number of sampling resistors, current sampling methods can be divided into three-resistor current sampling, two-resistor current sampling and single-resistor current sampling, among which the hardware cost of single-resistance current sampling is the lowest. When the system cost is high, single-resistor current sampling is a better choice.

[0003] The single-resistor c...

Claims

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