Linear Regulator with Current-Limited Short-Circuit Protection

Abstract

The invention relates to a linear voltage stabilizer with current-limiting short circuit protection. The linear voltage stabilizer comprises a starting circuit, a reference voltage circuit, a comparison amplifying circuit, a short circuit protection circuit, a current sampling circuit, a voltage sampling circuit and an adjusting pipe, wherein the starting circuit delivers the input voltage sourceinto the reference voltage circuit; the reference voltage circuit provides the adjusted reference voltage to the comparison amplifying circuit; an output end of the adjusting pipe is connected in series with the current sampling circuit; the current sampling circuit feeds back the sampled output current signal to the comparison amplifying circuit; the voltage sampling circuit feeds back the sampled output voltage signal to the comparison amplifying circuit; the comparison amplifying circuit processes the output current signal and the output voltage signal and delivers to a control end of the adjusting pipe so that the adjusting pipe works in a linear area and the aim of current limiting and voltage regulation is achieved; and the short circuit protection circuit processes the acquired output voltage signal and delivers to the control end of the adjusting pipe so that the adjusting pipe is adjusted from the linear area to a shutoff area and the aim of short circuit protection is achieved.

Description

technical field [0001] The invention relates to a linear voltage regulator, in particular to a linear voltage regulator with current-limiting short-circuit protection. Background technique [0002] The traditional electric voltage stabilizer relies on the beating of the relay to stabilize the output voltage. When the grid voltage fluctuates, the automatic correction circuit of the electric voltage stabilizer is activated, so that the internal relay acts to force the output voltage to remain near the set value. This circuit The advantage is that the circuit is simple, and the disadvantage is that the accuracy of voltage regulation is not high and every time the relay jumps and shifts, the power supply will be interrupted instantaneously and spark interference will occur. [0003] The compensation of system stability still mainly depends on the zero point produced by the output capacitor ESR, so the requirements for the output capacitor ESR are very strict, and the value of th...

AI Technical Summary

Problems solved by technology

In addition, during the entire working process and stable variation range, ESR must reside in a cross-border region, the sensitivity of LDO to ESR, and the high reliability of ESR to temperature and frequency are more likely to cause oscillation than any other reason, so A large, expensive capacitor is required to solve this problem, so a new compensation scheme is required

[0004] In addition, in practice, it is often encountered that there are various short-circuits with the power supply or ground due to misoperation, which may easily cause a short circuit, and in severe cases, the circuit will be burned, accidents will occur, and the safety performance is low.

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