Circuit breaker AC signal sampling circuit

• Main Authors: CAI JIWEN, DAI XUYI, TAN SAI, LUO ZHE, JIA JUN, CHENG JIAN
• Format: Patent
• Language: Chinese; English
• Published: 01.02.2022
• Subjects: MEASURING; MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES; PHYSICS; TESTING

The utility model relates to an alternating current signal sampling circuit of a circuit breaker. The alternating current signal sampling circuit of the circuit breaker is composed of a current transformer (CT1), a rectifier bridge composed of four diodes (D1, D2, D3 and D4), a differential circuit composed of two sampling resistors (R1 and R2), an operational amplifier (U1) and four resistors (R3, R4, R5 and R6), a voltage reference and an MCU with an A/D sampling module. The circuit overcomes the problem that a traditional circuit breaker alternating current signal sampling circuit can only collect the current amplitude of the circuit breaker and cannot obtain the current phase of the circuit breaker, the current amplitude of the circuit breaker can be obtained, the current phase of the circuit breaker can also be obtained, the A/D sampling module can adopt a conventional single-end A/D chip, the circuit cost is low, and the application range is wide. The circuit structure is simple. 本实用新型涉及一种断路器交流信号采样电路，所述