Overpower protection device

Abstract

The provided over-power protector comprises an oscillator to output frequency signal, an acquisition and comparison unit for over-power signal to output protective signal, an accumulated trigger unit connected between former two units to receive signal and output a terminal signal, a lock unit connected with last unit to receive the terminal signal and output a lock signal, a drive-signal producing unit connected between the lock unit and oscillator to receive the frequency signal and lock signal, and a drive-signal control unit connected to the last unit to receive the sensing signal and a second critical signal and output a clear signal to last unit to terminal the drive signal when the sensing signal up to the critical signal.

Description

technical field [0001] The invention relates to an overpower protection device, in particular to an overpower protection device applied to a power supply. Background technique [0002] At present, various power supplies are able to provide stable and regulated voltage and current. In order to comply with the consideration of safety regulations, the power supply must still provide an over-power protection function to ensure that the power supply itself and the power supply system are protected by limiting the output power during malfunctions such as overload, short circuit, and feedback open circuit. end. [0003] Please refer to figure 1 , is a schematic diagram of a known power supply. The power supply includes at least one transformer T 1 , a driving signal control unit 14, a driving signal generating unit 10, an oscillator 12 and a power switch Q 1 . Transformer T 1 Primary side switching current I P flow through the current sense resistor R S generates a current...

AI Technical Summary

Problems solved by technology

That is to say, the known power supply must provide peak power for a certain period of time to these loads with motor characteristics, and the peak power is often more than a multiple of the maximum output power, resulting in the main power switch and some withstand voltage Current components must increase voltage and current stress, which in turn increases cost

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