High-precision and fast detection circuit for three-phase AC voltage based on transformer
A three-phase voltage, three-phase AC technology, applied in the direction of measuring current/voltage, measuring only voltage, instruments, etc., can solve the problems of affecting the detection accuracy, limiting the application range, limiting the detection range, etc., achieving good versatility and easy production and high reliability
Active Publication Date: 2021-04-13
上海中电电子系统科技股份有限公司
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Problems solved by technology
But at present, these two schemes have the following problems respectively: First, the scheme based on three-phase voltage transformer and three-phase diode rectification filter circuit is simple and reliable, but due to the voltage drop loss of the diode rectification circuit, there is not only non-linearity of detection but also It affects the detection accuracy and limits the detection range. In addition, there is a large detection hysteresis
Second, the solution based on the Hall voltage sensor is expensive and limits its application range
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[0013] The present invention will be further described below in conjunction with accompanying drawing.
[0014] Such as figure 1 As shown, the transformer-based three-phase AC voltage high-precision fast detection circuit includes a three-phase bridge super rectifier circuit and an AC voltage signal processing circuit.
[0015] The three-phase bridge super rectifier circuit includes three-phase voltage transformer VS1, A phase positive op amp IC1, B phase positive op amp IC2, C phase positive op amp IC3, A phase negative op amp IC4, B phase negative Directional operational amplifier IC5, C-phase negative operational amplifier IC6, A-phase positive diode D1, B-phase positive diode D2, C-phase positive diode D3, A-phase negative diode D4, B-phase negative diode D5, C-phase negative diode D6, A-phase Phase upper voltage divider resistor R1, A phase lower voltage divider resistor R2, B phase upper voltage divider resistor R3, B phase lower voltage divider resistor R4, C phase upp...
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The invention belongs to the field of industrial measurement and control, and relates to a three-phase AC current voltage high-precision rapid detection circuit based on a transformer, which is suitable for various application occasions that require high-precision real-time monitoring and control of the effective value of the three-phase AC current voltage. The circuit of the present invention includes three-phase voltage transformer VS1, A-phase positive operational amplifier IC1, B-phase positive operational amplifier IC2, C-phase positive operational amplifier IC3, A-phase negative operational amplifier IC4, and B-phase negative operational amplifier IC5 , C-phase negative operational amplifier IC6, output operational amplifier IC7, A-phase positive diode D1, B-phase positive diode D2, C-phase positive diode D3, A-phase negative diode D4, B-phase negative diode D5, C-phase negative diode D6, etc. . The invention is composed of a three-phase bridge-type super diode rectifier circuit and an AC voltage signal processing circuit, and can detect the effective value signal of the three-phase AC voltage in real time with high precision and wide range. The circuit is simple, low in cost, high in reliability, good in versatility, and easy to be commercialized.
Description
technical field [0001] The invention belongs to the field of industrial measurement and control, and relates to a circuit, in particular to a three-phase AC voltage high-precision fast detection circuit based on a transformer, which is suitable for various types of high-precision real-time monitoring and control of the effective value of the three-phase AC voltage. application occasions. Background technique [0002] In various application systems based on three-phase AC power supply, it is necessary to detect the effective value of three-phase AC voltage. At present, there are two main types of detection schemes for the effective value of three-phase AC voltage: one is based on three-phase voltage transformer And the scheme of diode three-phase rectification and filtering circuit, which converts the effective value of three-phase AC voltage into DC voltage signal output; the other is a scheme based on Hall voltage sensor. However, these two solutions currently have the fol...
Claims
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IPC IPC(8): G01R19/00
CPCG01R19/0084
Inventor 丁禹心陈德传陈雪亭
Owner 上海中电电子系统科技股份有限公司