Positive and negative power sources with short circuit protection function

Abstract

The invention discloses positive and negative power sources with short circuit protection function, which comprise a transformer, a rectifying circuit, an assistant power voltage stabilizing circuit, an output power voltage stabilizing circuit, an operation amplifier U1, an operation amplifier U2, a PNP switch audion T1 and a NPN switch audion T2; the assistant power voltage stabilizing circuit is composed of PV3 and PV4; the output power voltage stabilizing circuit is composed of PV1 and PV2; the output ends of the PV3 and P4 are formed to be positive and negative poles of the assistant power source; collectors of T1 and T2 are formed to be positive and negative poles of output power source. When the positive or negative output is in earthing short circuit state, the positive and negative power sources with the short circuit protection function can cut off the output of power source and keep a low level state; when the short circuit fault disappears, the positive and negative power sources can recover the normal power supply, realize the effective protection of element appliances, and prolong the service life of the power source; the beneficial effects are significant; the positive and negative power sources are applicable to apply and popularize.

Description

technical field [0001] The present invention relates to a positive and negative power supply with short-circuit protection function, more specifically, to a positive and negative power supply with short-circuit protection function for identifying short-circuit by comparing changes in output voltage and shutting off the corresponding output through switching transistors. Background technique [0002] The regulated power supply is used to provide a constant voltage output for electrical equipment or circuits. During the working process of the regulated power supply, the output terminal will be short-circuited; for example, for a regulated power supply with positive and negative output, When the positive output terminal or negative output terminal of the power supply is short-circuited to the ground, if the output of the power supply is not cut off, it is very easy to cause damage to the components in the regulated power supply and affect the normal use of the regulated power su...

AI Technical Summary

Problems solved by technology

[0002] The regulated power supply is used to provide a constant voltage output for electrical equipment or circuits. During the working process of the regulated power supply, the output terminal will be short-circuited; for example, for a regulated power supply with positive and negative output, When the positive output terminal or negative output terminal of the power supply is short-circuited to the ground, if the output of the power supply is not cut off, it is very easy to cause damage to the components in the regulated power supply and affect the normal use of the regulated power supply

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