Hardware overload or short circuit protection circuit and DC (Direct Current) power supply circuit

Abstract

The invention discloses a hardware overload or short circuit protection circuit. The hardware overload or short circuit protection circuit is characterized by comprising a switching power supply output unit K, a current limiting output resistor R0 and a protection unit P, wherein the switching power supply output unit K is arranged between a DC (Direct Current) power supply E and the positive pole of a power supply output end, and is used for controlling the on-off of the circuit, the current limiting output resistor R0 is arranged on a line between the switching power supply output unit K and the positive pole of the power supply output end, and is used for detecting the voltage difference between the two ends of the current limiting output resistor R0, and the protection unit P comprises a positive feedback comparison circuit which generates a hysteresis comparison range, that is, a first comparison voltage threshold and a second comparison voltage threshold, wherein the first comparison voltage threshold is larger than the second comparison voltage threshold. According to the hardware overload or short circuit protection circuit, the structure is simple, the cost of the used components is low, the control precision is high, and the problem of repeated triggering by mistake is avoided. The hardware overload or short circuit protection circuit can be widely used in the DC power supply protection circuit.

Description

technical field [0001] The invention relates to the technical field of power supply protection, in particular to a hardware overload or short circuit protection circuit and a DC power supply circuit. Background technique [0002] In the field of automatic control, the controller often needs to collect signals from multiple external sensors for feedback control. Most of the sensors are active, that is, they need power supply to work normally, which requires the controller to be designed with a power system circuit that can supply power to the sensor. [0003] If the external sensor and the internal circuit of the controller are powered by the same power module circuit, when the external sensor fails or the positive and negative electrodes of the sensor are short-circuited due to a wiring harness problem, the internal circuit of the controller will not be able to receive normal power supply, resulting in The whole system is paralyzed. Therefore, the power supply of the contr...

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to provide a hardware overload or short circuit protection circuit and a DC power supply circuit to solve the problem that the existing protection circuit uses an inverse proportional circuit to detect the current, the error is large, and it is easy to trigger repeatedly by mistake, and the structure is complex. high cost

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