Why study DC power supply circuit
Power supply is almost all electrical equipment must be, and most of the electrical equipment are used DC power supply. For example, most small-scale digital chips (74 series) use +5 volts DC power supply, and requires the power value between + 4.5 ~ +5.5 volts, if the supply voltage beyond this range, the digital chip logic will be abnormal, This is because the internal circuit of these chips is designed to determine the bias voltage is based on the above-mentioned power supply range; and, for example, the use of analog op amps, the reason is the same, of course, op amp power supply to a little wider. Imagine if the amplitude of an analog signal needs to be amplified to + -6 volts, and if the power supply of the op amp that processes the signal changes below +6 volts or greater than -6 volts, how can it be guaranteed The amplitude of the processed signal is +6 volts to -6 volts?
As for why the acceptance of DC power supply circuit, is certainly to do DC power supply.
The performance of some devices has a direct relationship with the voltage, the voltage changes will cause the equipment performance stability or output parameters. So in some specific equipment before adding power supply, DC power supply is about to convert AC power to a stable voltage DC power supply.
