DC regulated power supply is also called DC voltage regulator. Its supply voltage is mostly AC voltage. When the voltage of the AC supply voltage or the output load resistance changes, the direct output voltage of the regulator can be kept stable. The parameters of the regulator are voltage stability, ripple factor and response speed. The former represents the effect of changes in the input voltage on the output voltage. The ripple factor indicates the amount of AC component in the output voltage under rated operating conditions; the latter indicates the time it takes for the voltage to return to normal when the input voltage or load changes drastically. The DC stabilized power supply is divided into two types: continuous conduction type and switch type. The former is converted into a suitable value by a power frequency transformer to a single-phase or three-phase AC voltage, and then rectified and filtered to obtain an unstable DC power supply, and then a stabilized voltage (or current) is obtained through the voltage stabilization circuit. The power line is simple, the ripple is small, and the mutual interference is small, but the volume is large, the consumables are large, and the efficiency is low (usually lower than 40% to 60%). The latter regulates the output voltage by changing the on-off time ratio of the adjustment component (or switch) to achieve regulation. This kind of power supply has low power consumption and the efficiency can reach about 85%, but the disadvantage is that the ripple is large and the mutual interference is large. Therefore, it has developed rapidly since the 1980s. From the way of working can be divided into:
1 controllable rectifier type. Adjust the output voltage by changing the on-time of the thyristor.
2 æ–© wave type. The input is an unstable DC voltage, which is changed by the on-off ratio of the switching circuit to obtain a unidirectional pulsating DC, and then filtered to obtain a stable DC voltage.
3 converter type. The unstable DC voltage is first converted into high-frequency alternating current by the inverter, and after being transformed, rectified and filtered, the new DC output voltage is sampled, and the operating frequency of the inverter is feedback-controlled to achieve the purpose of stabilizing the output DC voltage.
Electrical use
AC regulated power supply is used for voltage regulation and protection of modern high-tech products such as computers and peripheral devices, medical electronic instruments, communication and broadcasting equipment, industrial electronic equipment, and automatic production lines. DC stabilized power supply is widely used in DC power supply for national defense, scientific research, universities, laboratories, industrial and mining enterprises, electrolysis, electroplating, charging equipment, etc.
(1) It can be used for aging of various electronic devices, such as aging of PCB board, aging of household appliances, aging of various IT products, aging of CCFL, aging of lamps
(2) Applicable to the aging and testing of electronic components that require automatic timing, power-off, and automatic cycle counting.
(3) Electrolytic capacitor pulse sophisticated
(4) Responsive testing of resistors, relays, motors, etc.
(5) sophisticated machine; electronic component performance test, routine test
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