One of the switching regulated power supply circuits

Switching-type regulated power supply has high efficiency, light weight and low heat generation. It is often used in color TVs, square wave devices, lasers,
electronic computers and numerical control devices.
    Its general working principle is as follows: directly rectify the AC voltage of the power grid to obtain pulsating DC, and then
convert it into a high-frequency pulse width alternating voltage of about 20kHz through a pulse width converter (multivibrator), and then perform rectification and filtering to obtain a stable winning current. . The voltage stabilization
process is achieved by utilizing the energy storage function of the circuit.
    As shown in the circuit diagram, it can output voltage 20V and current 5A. When the input voltage of this power supply is 35V (1+
10%), the output voltage is continuously adjustable in the range of 7 to 26V, the maximum current is 5A, the internal resistance is 0.1Q, the ripple voltage peak value
is ≤10mA, and the overload protection current is 6A.