A wide voltage adaptive high isolation voltage detection circuit and its detection method

Abstract

The invention discloses a wide-voltage self-adaptive high-isolation voltage detection circuit and a detection method thereof, comprising: a rectifier circuit; a high-isolation signal detection circuit; The terminals are respectively connected with the rectifier circuit and the high isolation signal detection circuit. The rectifier circuit converts the input voltage into a direct current voltage; the adaptive current limiting circuit automatically adjusts the resistance value of the current limiting resistor according to the level of the input voltage to limit the current in the circuit; the high isolation signal detection circuit controls the input and output The signal is highly isolated and detects the input voltage signal. The invention has wide input voltage range, self-adaptive input voltage, and high isolation between input and output.

Description

technical field [0001] The invention relates to a wide-voltage adaptive high-isolation voltage detection circuit and a detection method thereof, which realize isolation detection of wide-range AC and DC voltages and belong to the technical field of power supplies. Background technique [0002] Voltage signal detection is a circuit often used in power supplies and other equipment. Current voltage detection circuits mostly use current-limiting resistors with fixed resistance, or use manual jumper methods to adapt to different voltage levels; generally use between input and output signals optocoupler for isolation. The circuit using fixed current-limiting resistors is limited by the current of sampling devices such as optocouplers and current-limiting resistors, and the voltage detection range is narrow; the detection method using manual jumper wires is complicated to operate and cannot adapt to circuits with large voltage fluctuations. In the circuit using optocoupler isolati...

AI Technical Summary

Problems solved by technology

Circuits using fixed current-limiting resistors are limited by the current of sampling devices such as optocouplers and current-limiting resistors, and the voltage detection range is narrow; manual jumper detection methods are used, which is complicated to operate and cannot adapt to circuits with large voltage fluctuations.

In the circuit using optocoupler isolation, the isolation voltage between the input and output is limited by the isolation voltage of the optocoupler, and once the optocoupler is broken down, it may cause damage to the weak current part of the subsequent stage

[0003] In some special applications such as underground coal mines, AC127V or AC660V AC voltage needs to be detected in different application scenarios, and the input voltage is unstable, so it is difficult for a general detection circuit to adapt to the detection of two voltage signals at the same time; If it is broken down, it will seriously threaten the safety of precision equipment such as sensors connected to the rear stage

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