Linear DC regulated power supply capable of earth leakage protection

Abstract

The invention provides a linear DC regulated power supply capable of earth leakage protection. The linear DC regulated power supply includes a DC regulated power supply circuit, an earth leakage protection circuit. The DC regulated power supply circuit includes a regulated voltage adjusting module, a voltage reference module and a feedback adjusting module. The regulated voltage adjusting module is intended for conducting regulated voltage adjusting on wide-range DC voltage input and outputting a regulated voltage. The voltage reference module is intended for, based on the regulated voltage output by the regulated voltage adjusting module, obtaining a voltage reference. The feedback adjusting module is intended for comparing and amplifying a sampled output voltage with the voltage reference, feedbacking the result to the regulated voltage adjusting module for conducting regulated voltage and adjusting. The earth leakage protection circuit is intended for detecting a leaked current on an output end which is connected to a DC regulated voltage circuit, and transmitting the information of the leaked current to a single-unit controller, and conducting leakage protection under the control of the single-unit controller. According to the invention, the linear DC regulated power supply is advantaged by wide input, low voltage difference, and high precision, etc.

Description

technical field [0001] The invention relates to power supply voltage stabilization technology, in particular to a linear direct current voltage stabilization power supply with leakage protection function. Background technique [0002] Electricity is not only the driving force for the rapid development of all walks of life, but also the economic artery of a country. Therefore, all walks of life are closely related to electricity. Even so, electricity is a double-edged sword, with its own drawbacks and risks associated with its use. These dangers may occur in some incorrect installation methods or electrical equipment that is not up to standard. In this way, there may be hidden dangers of electrical accidents, which are even more threatening to the safety of human life and property. As we all know, leakage occurs from time to time in our daily life, and the accompanying hazards of leakage should not be underestimated. Therefore, a power supply device with a leakage protecti...

AI Technical Summary

Problems solved by technology

However, for general voltage stabilizing circuits, the input voltage range for normal operation is limited, and the low value is 2-3V higher than the output voltage. If it is too high, it will easily cause excessive consumption of the regulator tube.

Therefore, the current DC power supply with leakage protection function has disadvantages such as low precision, high voltage drop, and narrow input range.

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