Overcurrent protection control circuit suitable for alternating current and direct current

Abstract

The invention discloses an overcurrent protection control circuit suitable for alternating current and direct current, which comprises an oscilloscope current probe module, a flyback switching power supply module, an oscilloscope, a signal amplifier, an analog-to-digital conversion ADC, an optical coupler U1, an MCU microprocessor U2, a resistor R1, a resistor R3, a triode Q1, a relay K1 and a diode D2. The circuit can act on a switching power tube of a device, solves the potential safety hazard and the risk of equipment damage caused by the fact that a switching power supply cannot be protected due to overcurrent, gives consideration to the purpose of monitoring an abnormal waveform, and improves the convenience of analyzing the abnormality for subsequent development and design personnel.

Description

technical field [0001] The invention relates to the technical field of switching power supplies, in particular to an overcurrent protection control circuit suitable for AC and DC. Background technique [0002] When R&D personnel debug or test the switching power supply, the switching power supply often burns when it starts or works abnormally due to various reasons, and brings certain safety hazards to the testers. Because the front end has no direct protection action, the burned power supply often explodes beyond recognition, and it is impossible to intuitively analyze the problem, which brings certain difficulties to the debugging personnel. If the front end is equipped with an overcurrent protection device, it will not only be bulky, but also expensive, and AC and DC cannot be directly compatible, so separate wiring is required. The most important thing is that the switching power supply at the back end cannot be directly protected. It brings inconvenience to the back-en...

AI Technical Summary

Problems solved by technology

[0002] When R&D personnel debug or test the switching power supply, they often burn out when the switching power supply starts or works abnormally due to various reasons, and brings certain safety hazards to the testers.

Because there is no direct protection action on the front end, the burned power supply is often beyond recognition, and it is impossible to intuitively analyze the problem, which brings certain difficulties to the debugging personnel.

If an overcurrent protection device is installed at the front end, it will not only be too bulky, but also costly, and the AC and DC are not directly compatible, so separate wiring is required. The most important thing is that it cannot directly protect the switching power supply at the back end, and it is only an action to cut off the power supply. It brings inconvenience to the back-end design, development and debugging personnel, and because of the manual switch, there is also the problem of action delay, and the air switch cannot be closed in time. The problem

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