Circuit with current limiting lock function

Abstract

The present invention provides a circuit with a current limiting locking function, comprising: a current detection circuit, a current control circuit, a power supply switch control circuit and an overcurrent locking circuit; the current detection circuit is used to detect the current value in the power supply circuit, and The current signal is converted into a voltage signal and fed back to the current control circuit; the current control circuit is used to convert the voltage signal provided by the current detection circuit into a switch signal. When the current is normal, the switch signal is off. When the current value exceeds the limit value When the switch signal is on, the switch signal is fed back to the power supply switch control circuit; the power supply switch control circuit is used to realize the switch control of the power supply circuit by the switch signal provided by the current control circuit, and when the switch signal is off, open The power supply circuit, when the switch signal is on, closes the power supply circuit and cuts off the output of the power supply; the present invention closes the power supply circuit when current limiting is realized.

Description

technical field [0001] The invention relates to the technical field of electronic circuits, in particular to a circuit with a current limiting and locking function. Background technique [0002] With the development of electronic technology, power supply devices pay more and more attention to safety performance, among which current limiting technology is the core technology to ensure safety performance. There are two types of current limiting technology: current limiting type and intercepting type. The technical method of the current-limiting circuit is generally to apply a constant voltage on the current-limiting resistor to limit the maximum output power. The advantage is that the circuit is simple, and the disadvantage is that it will always output the maximum limited power when the load is short-circuited and cannot be turned off. circuit; the technical method of the cut-off circuit is generally to use the sampling resistor to monitor the current of the loop, and when t...

AI Technical Summary

Problems solved by technology

The technical method of the current-limiting circuit is generally to apply a constant voltage on the current-limiting resistor to limit the maximum output power. The advantage is that the circuit is simple, and the disadvantage is that it will always output the maximum limited power when the load is short-circuited and cannot be turned off. circuit; the technical method of the cut-off circuit is generally to use the sampling resistor to monitor the current of the loop, and when the current exceeds the set maximum current, the power supply output is turned off. The advantage is that the shutdown speed is fast and there is no current output when the current is over-current. , the circuit design is more difficult and requires a higher level of hardware

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