Three-phase current sampling circuit

The utility model discloses a three-phase current sampling circuit, which converts large current into small current for output through three current transformers, reduces the number of the current transformers, and reduces the size and cost of the circuit. Through cooperation of an operational ampli...

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Bibliographic Details
Main Authors ZHOU YONGHONG, WANG ZHE, DENG JIANFEI
Format Patent
LanguageChinese
English
Published 01.11.2022
Subjects
MEASURING
MEASURING ELECTRIC VARIABLES
MEASURING MAGNETIC VARIABLES
PHYSICS
TESTING
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Summary:The utility model discloses a three-phase current sampling circuit, which converts large current into small current for output through three current transformers, reduces the number of the current transformers, and reduces the size and cost of the circuit. Through cooperation of an operational amplifier U1D, a diode D10, a diode D11, a resistor R14 and a resistor R18, the operational amplifier U1D outputs a DC voltage to an operational amplifier circuit, and through the resistor R14 and the resistor R18 with different resistance values, the operational amplifier U1D outputs different voltages instead of a VREF bias voltage, and the circuit cost is reduced under the condition that the sampling circuit precision is ensured; and meanwhile, the voltage amplified by the operational amplification circuit corresponds to the peak value of the current, so that the ADC sampling module does not need a high-precision ADC unit, and the overall cost of the circuit is further reduced. 本实用新型公开了一种三相电流采样电路，通过3个电流互感器将大电流转换为小电流输
Bibliography:Application Number: CN202221552675U