Circuit overcurrent protection device and method

Abstract

The invention discloses a circuit overcurrent protection device and method, relates to circuit fuse protection technology, and solves the problem that a fixed fusing current value causes a potential safety hazard. The device comprises an electronic fuse protection circuit current setting resistor, a voltage dividing circuit, a first-order overcurrent protection resistor adjusting circuit and a second-order overcurrent protection resistor adjusting circuit. The technical solution provided by the invention is suitable for circuit protection of electronic devices, and realizes a fuse protection scheme adapted to a voltage variation scenario.

Description

technical field

[0001] The invention relates to circuit fusing protection technology, in particular to a circuit overcurrent protection device and method. Background technique

[0002] The existing electronic fuse protection circuit relies on the external resistance of the corresponding pin to set the overcurrent protection current when the circuit is working. Once the corresponding resistance is selected, the protection current value is fixed. However, when the circuit starts to work, the output The voltage is low but the surge current caused by charging the capacitor at the output terminal is relatively large. In order to prevent false triggering, only a relatively large overcurrent protection value can be set. However, after normal operation, the output voltage reaches the preset value, but the current value is far away. If it is less than the set value of the overcurrent protection, the overcurrent protection point will be too high. When an abnormality occurs, it will no...

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