The design of rectifier circuit has large filter capacitance, so the power supply has the characteristics of instantaneous high current supply, low noise, fast response speed and small output ripple.
3 filter circuit Capacitance filter circuit filters out most of the components from the smooth direct current. This circuit uses 3300 u F/100 V large capacitor C3, C4 output voltage is smoother, power supply characteristics change instantly, and it is suitable for inductive loads.
4 is powered by LM3 17 output voltage circuit, and LM337 outputs negative power supply. LM3 17 and LM337 both adopt perfect protection circuits including internal thermal overload, over-current protection, thermal shutdown and compensation of safe working area, so that the power supply can omit easily-worn devices such as fuses.
Regulating circuit: to meet the needs of different applications, the voltage is set to be adjustable. The output voltage is calculated as Uo = 1.25 by (1+Rf/R), and a precision resistor can be selected to adjust the resistance, so as to ensure that the output voltage is accurately adjustable.
The protection circuit of linear power supply generates a large amount of heat, so the power supply should be equipped with enough radiators. Due to the appearance of high-performance integrated circuits, the circuit structure can be simplified and the key part of power conversion can be highlighted. Through debugging and testing, the circuit performance is good. The power supply can not only be used alone, but also be used as a voltage stabilizing or current stabilizing power supply in other electronic devices.
Keywords: DC power rectifier circuit voltage filter circuit protection circuit