DC voltage-stabilized power supply

Abstract

The invention provides a DC voltage-stabilized power supply. An inductor L, a fly-wheel diode D, a load resistor R1, a load resistor R2, a load resistor R3, a load resistor R4 and a load resistor R0 are sequentially connected in series between positive and negative electrodes of a power supply Vin, and the negative electrode of the power supply Vin is grounded; a Q end of a pulse width modulation controller is connected with a grid of a switching tube M, a detecting end detecte1 is connected with a rear end of the load resistor R3, and a detecting end detecte2 is connected with a source of the switching tube M and then connected with a rear end of the load resistor R4; and a drain of the switching tube M is connected with a rear end of the inductor L. The DC voltage-stabilized power supply has the advantages of very high conversion efficiency, low operating voltage, undercurrent and overcurrent detection, power-saving mode control and the like, provides biasing for internal operating points through a bandgap reference voltage source, greatly improves the stability of system, increases power supply voltage fluctuation resistance, and improves suppression of interference caused by temperature change and noise.

Description

technical field [0001] The invention relates to the field of electricity, in particular to a DC stabilized power supply. Background technique [0002] DC regulated power supply is also called DC-DC converter, switching power supply or switching regulator. As a branch of power supply system, DC regulated power supply is widely used in communication, computer, household appliances and other fields. The regulated power supply is divided into two categories: linear regulated power supply and switching regulated power supply. The main feature of the linear stabilized voltage source is that the adjustment tube works in a linear amplification state, which has the advantages of high stability, good reliability, and low cost. The disadvantages are low conversion efficiency, large power consumption, and large size, which limit the linear stabilized voltage supply. Applications. Switching power supply is called high-efficiency energy-saving power supply. In recent years, with the ra...

AI Technical Summary

Problems solved by technology

The conversion efficiency of switching power supply is low, the internal key components work in high-frequency switching state, the stability of the system is poor, the ability to resist fluctuations in power supply voltage is low, and it does not have the ability to detect and control under-current and over-current

Images