Overload protection circuit of power supply скачать в хорошем качестве

Overload protection circuit of power supply

Overload protection circuit of power supplyPower supply overloads often appear under a short circuit or load current increase exceeding the permissible limit. This results in power supply elements failure.This device eliminates such cases.How it works?When you press SB1 button, voltage is supplied to the primary transformer winding through R1 resistor which reduces the first current surge.The rectified voltage is supplied through a supply filter and R2 voltage-dropping resistor to K1 electromagnetic relay winding. Commutation blocks SB1 button and R1 resistor. As a result we receive a full output supply voltage.Under a short circuit the output voltage drops abruptly, the relay breaks the supply of the primary winding of a power transformer.Under a high current in the power supply overload R3 resistor allows regulating the device sensitivity to consumption current exceeding. This ensures control of even an insignificant exceeding of admissible load current output which leads to the triggering of the relay. C3 capacitor determines the relay release speed.R2 resistor nominal depends on the relay parameters. Press SB2 button to shutdown the supply manually by breaking the relay.