Why are regulated power sources widely used
There are various classification methods for regulated power sources, including DC regulated power sources and AC regulated power sources according to the type of output power source; According to the connection method between the voltage stabilizing circuit and the load, there are series voltage stabilizing power supplies and parallel voltage stabilizing power supplies; According to the working state of the adjustment tube, there are linear regulated power supplies and switch regulated power supplies; According to circuit type, there are simple regulated power supplies and feedback regulated power supplies, etc.
Advantages and disadvantages of switch regulated power supply
Advantages:
Compared with series adjustment regulated power supply, "switch type regulated power supply" is more efficient and energy-saving; Strong ability to adapt to changes in electricity supply; Wide adjustable range of output voltage; A single switch can easily obtain multiple sets of power supplies with different voltage levels; It has many advantages such as small size and light weight, and is widely adopted.
(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, resulting in a significant reduction in the capacity and volume of the filtering capacitor
(5) Flexible and diverse circuit forms
Working principle: After rectification and filtering, the DC voltage is supplied by R1 to the base of the adjustment tube, making the adjustment tube conductive. When V1 is conductive, the voltage passes through RP and R2 to make V2 conductive, and then V3 also conductive. At this time, the emitter and collector voltages of V1, V2, and V3 no longer change (their function is completely the same as that of a voltage regulator tube). By adjusting RP, a stable output voltage can be obtained, and the ratio of R1, RP, R2, and R3 determines the voltage value output by this circuit.
The difference between linear regulated power supply and switching power supply
Switching regulated power supply is achieved by converting DC into high-frequency pulses and then conducting electromagnetic transformation to achieve voltage conversion and voltage stabilization. A linear regulated power supply is a controllable adjusting element directly connected in series to divide the input DC voltage, achieving voltage transformation and stabilization, essentially equivalent to connecting a variable resistor in series.
The switch regulated power supply has high efficiency and can increase or decrease voltage. Linear regulated power supply can only reduce voltage and has low efficiency. Switching regulated power supplies can generate high-frequency interference, while linear regulated power supplies have no interference
