Working principle and classification of regulated power supply
Basic working principle
The power frequency AC power supply is stepped down, rectified and filtered by the transformer to become a stable DC power. The rest of the figure is the control part that performs voltage regulation and achieves regulation. After the power supply is connected to the load, the output voltage is obtained through the sampling circuit, and the output voltage is compared with the reference voltage. If the output voltage is less than the reference voltage, the error value is amplified by the amplifying circuit and sent to the input end of the regulator, and the output voltage is increased by the regulator adjustment until it is equal to the reference value; if the output voltage is greater than the reference voltage, the regulator is passed Reduce the output. 
Classification and characteristics of regulated power supply 1. AC regulated power supply:
1. Advantages of auto-coupled regulated power supply: simple structure, low cost, and small distortion of output waveform.
Disadvantages: easy to burn, voltage adjustment speed is slow.
2. Change the advantages of the tap type: the circuit is simple, the voltage regulation range is wide, and the price is low.
Disadvantages: Low voltage regulation and short working life.
3, high power compensation type advantages: good anti-interference performance, high voltage regulation accuracy, fast response circuit is simple.
Disadvantages: The input current distortion is large, the source power factor is low; the output voltage has a phase shift to the input voltage.
4, parameter adjustment advantages: simple structure, high reliability, strong anti-interference ability.
Disadvantages: high energy consumption, high noise, heavy and high cost.
5, switching type power supply advantages: good stability, strong control.
Disadvantages: The circuit is complicated and the price is high.
Second, DC power supply
1. Advantages of chemical power supply: compact and flexible.
Disadvantages: insufficient power supply and environmental pollution.
2, linear power supply advantages: high stability, small ripple, high reliability.
Disadvantages: Large volume power consumption and low conversion efficiency.
3, switching power supply
Advantages of AC/DC power supply: small size, light weight, stable and reliable.
Disadvantages: Large ripple.
4, DC / DC power supply
5, communication power
6, radio power
7, module power supply
8, special power supply
Power supply maintenance
1. After the power supply is used for a period of time, the indication circuit should be approved. The calibration method can be adjusted by comparing the external voltmeter with the ammeter and the on-board indicating instrument; (voltage and current indication calibration respectively) for approval. However, it should be noted that since the chassis is made of steel plate structure, a small amount of reading will be caused after the cover is closed. After observing the range, the remaining amount can be adjusted during the startup adjustment.
2. Always check that the power cord wiring is loose and the interior is cracked.
3. Check if the binding posts are loose and the screws inside and outside the chassis are secure.
4. When cleaning the chassis panel and the cover, it is forbidden to use organic solvents or detergents for descaling. Use a neutral soap wave to clean with a soft rag and wipe dry.
5. The instrument should be kept clean and placed vertically.
6. If the instrument fails during use:
a No output voltage: Check if the power switch is connected, the fuse is intact, check the circuit for short circuit.
b The output voltage is too high: Check if the adjustment tube is broken.
C output voltage is unstable: Check if the reference voltage is stable.
d Output current is not enough: Check if the adjustment camp burns open circuit and the load is too heavy.
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