Alternating current detection circuit based on bidirectional optocoupler

Abstract

The invention relates to an alternating current detection circuit, in particular to an alternating current detection circuit based on a bidirectional optocoupler. According to the technical scheme, the alternating current detection circuit based on the bidirectional optocoupler comprises a transient suppression diode. The transient suppression diode is connected with a first input end of a bidirectional optocoupler primary circuit through a first resistor. A first end of a bidirectional optocoupler secondary circuit is connected with VCC (volt current condenser). A second end of the bidirectional optocoupler secondary circuit is grounded through a second resistor. Second capacitors are connected to two ends of the second resistor in parallel. By the use of the transient suppression diode, low noise interference in the circuit can be eliminated, and transient high voltage in the circuit can also be suppressed. By the use of the bidirectional optocoupler in the circuit, positive-direction alternating current signals and negative-direction alternating current signals can be detected, high voltage and low voltage are effective isolated, and subsequent circuit systems are protected.

Description

technical field [0001] The invention relates to an AC detection circuit, in particular to an AC detection circuit based on a bidirectional optocoupler, and belongs to the technical field of AC detection circuits. Background technique [0002] With the rapid development of modern industry, more and more AC systems are used in electric power, electronics, machinery and other occasions. At the same time, with the intelligent market demand and large-scale management of equipment, in most cases, it is necessary to The status of the AC power supply is detected to determine whether the power supply of the system is normal or whether it is on / off. At present, the solutions for AC detection are mainly divided into two categories: one is to step down, rectify, stabilize and filter the AC power, and then convert it into electronic switching value through the triode for microcontroller query; the other is to use it directly The corresponding AC voltage or AC current sensor completes th...

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Problems solved by technology

Obviously, the former method is more traditional, its circuit structure is complicated, and its stability is poor, so it is not an ideal choice.

The latter method uses a sensor with a simple circuit. In addition to detecting the state of the AC signal, it can also complete the measurement of its related data, but the price of the sensor is relatively expensive, and the equipment cost is relatively high in mass production.

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