Detection circuit and detection method

Abstract

The invention discloses a detection circuit and a detection method, which belong to the electronic technology field. The detection circuit comprises a first isolation module, a first resistor, a second resistor, a first signal collecting module, and a signal processing module. The first isolation module comprises a first isolation unit and a second isolation unit. One end of the first isolation unit is connected to a target line, and one end of the second isolation unit is connected to a device housing. A first input end of the first signal collecting module and one end of the first resistor are respectively connected to the other end of the first isolation unit. A second input end of the first signal collecting module and one end of the second resistor are respectively connected to the other end of the second isolation unit. The other end of the first resistor and the other end of the second resistor are respectively connected to the reference ground. The output end of the first signal collecting module is connected to the input end of the signal processing module. The invention is advantageous in that no matter the live wire and zero wire accessed to the device are in forward connection or reverse connection, fault detection of the device can be realized.

Description

technical field [0001] The invention relates to the field of electronic technology, in particular to a detection circuit and a detection method. Background technique [0002] Generally, the electric energy used by the equipment is provided by a power distribution system, which may include an IT system, a TT system, and a TN system. Since the voltage of any live wire in the power distribution system to the earth exceeds the Safety Extra-low Voltage (SELV), during the operation of the equipment, if the live wire is broken down by overvoltage due to insulation, The metal core wire in the live wire is lapped to the equipment shell of the equipment due to the aging of the insulation, the damage of the insulation, etc., which may cause dangerous voltage to be carried on the equipment shell, thus posing a huge threat to the personal safety of users. Therefore, in order to enable the user to know in time whether the equipment housing is carrying a dangerous voltage, live detection ...

AI Technical Summary

Problems solved by technology

[0005] There are at least the following problems in the prior art: when the live wire connected to the device is reversely connected to the neutral wire, if the metal core wire in the live wire is lapped to the device case and the device case is electrified, the current in the live wire will flow through the device case at this time. After passing through the detection circuit, it will flow back to the live wire, that is, at this time, the live wire, the equipment casing, the detection circuit and the neutral wire cannot form a current loop, so that an effective live alarm for the equipment casing cannot be carried out.

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