summary of power Supplies


● The primary purpose of a power supply is to convert AC to DC.

● Power supplies built with transformers are not isolated from the power source.

● Transformers are used in power supplies for isolation and to step up or step down the voltage.

● A rectifier circuit converts incoming AC voltage to pulsating DC voltage.

● The basic rectifier circuits are half-wave, full-wave, and bridge.

● Half-wave rectifiers are simpler and less expensive than either full-wave or bridge rectifiers.

● The full-wave rectifier is more efficient than the half-wave rectifier.

● The bridge rectifier can operate without a transformer.

● To convert pulsating DC voltage to a smooth

DC voltage, a filter must follow the rectifier in the circuit.

● A capacitor in parallel with the load is an effective filter.

● A voltage regulator provides constant output re- gardless of load and input voltage changes.

● The voltage regulator is located after the filter in the circuit.

● The two basic types of voltage regulators are the shunt regulator and the series regulator.

● The series regulator is more efficient and therefore more popular than the shunt regulator.

● Voltage multipliers are circuits capable of providing higher DC voltages than the input volt- age without the aid of a transformer.

● Voltage doublers and voltage triplers are voltage multipliers.

● Voltage dividers can reduce high voltages to lower voltages.

● A crowbar is a circuit designed for overvoltage protection.

● A fuse protects a circuit from a current overload.

● Fuses are classified as either normal or slow-blow.

● Circuit breakers perform the same job as fuses but do not have to be replaced each time there is an overload.


Ahmed Farahat is EECS engineer With 18 years of experience in the field he worked on different technological discipline and and had honored Post Graduate Diploma In Computer Science And Engineering

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