Why is regulated power supply widely used?
There are many classification methods for regulated power supplies. According to the type of output power supply, they are divided into DC regulated power supply and AC regulated power supply; according to the connection method between the voltage stabilizing circuit and the load, they are divided into series regulated power supply and parallel regulated power supply; according to the adjustment tube The working state is divided into linear regulated power supply and switching regulated power supply; according to the circuit type, it is divided into simple regulated power supply and feedback type regulated power supply, etc.
Advantages and Disadvantages of Switching Regulated Power Supply
advantage:
Compared with the "series regulated regulated power supply", "switching-type regulated power supply" is more efficient and energy-saving; has strong ability to adapt to changes in the mains power; has a wide adjustable range of output voltage; one switching tube can easily obtain multiple sets of voltage levels. Power supply; small size, light weight and many other advantages, it is widely used.
(1) Low power consumption and high efficiency
(2) Small size and light weight
(3)Wide voltage stabilization range
(4) The efficiency of filtering is greatly improved, which greatly reduces the capacity and volume of filter capacitors.
(5)Circuit forms are flexible and diverse
Working principle: After rectification and filtering, the DC voltage is provided to the base of the adjustment tube by R1, causing the adjustment tube to turn on. When V1 is turned on, the voltage passes through RP and R2 to turn on V2, and then V3 is also turned on. At this time, V1, The emitter and collector voltages of V2 and V3 no longer change (its function is exactly the same as the voltage regulator tube). By adjusting RP, a stable output voltage can be obtained. The ratio of R1, RP, R2 and R3 determines the output voltage value of this circuit.
The difference between linear regulated power supply and switching power supply
The switching power supply converts DC into high-frequency pulses, and then performs electromagnetic conversion to achieve voltage conversion and voltage stabilization. A linear regulated power supply directly connects a controllable adjustment component in series to divide the input DC voltage to achieve voltage conversion and voltage stabilization. It is essentially equivalent to connecting a variable resistor in series.
Switching regulated power supplies are highly efficient and can step up or step down. Linear regulated power supplies can only step down the voltage and have low efficiency. Switching regulated power supplies will produce high-frequency interference, while linear regulated power supplies have no interference.
