voltage detection circuit

Abstract

The invention discloses a voltage detection circuit. The voltage detection circuit comprises a positive detection terminal, a negative detection terminal, a power supply, a switch, a comparator, a voltage stabilizer, a rheostat, a transistor and a display circuit, wherein the positive and negative detection terminals are connected with a positive terminal and a negative terminal of voltage to be detected; a near power supply terminal of the switch is connected with a positive electrode of the power supply; the comparator comprises a normal phase input terminal, an inverting input terminal, a power supply terminal, a grounding terminal and an output terminal; the power supply terminal of the comparator is connected with a far power supply terminal of the switch; the grounding terminal of the comparator is connected with a negative electrode of the power supply; a voltage-stabilizing input terminal of the voltage stabilizer is connected with the far power supply terminal of the switch; a voltage-stabilizing and grounding terminal of the voltage sterilizer is connected with the negative electrode of the power supply; a first fixing terminal of the rheostat is connected with a voltage-stabilizing outer terminal of the voltage stabilizer; a second fixing terminal is connected with the negative electrode of the power supply; a free terminal is connected with the inverting input terminal of the comparator; a grid electrode of the transistor is connected with the output terminal of the comparator; one of a source electrode and a drain electrode of the transistor is connected with the far power supply terminal of the switch; and the display circuit is connected with the other one of the source electrode and the drain electrode of the transistor.

Description

【Technical field】 [0001] The invention relates to a voltage detection circuit, in particular to a voltage detection circuit capable of detecting multiple voltage ranges. 【Background technique】 [0002] With the development and progress of science and technology, electronic products are more and more widely used in home and office occasions, and many electronic products will use power devices such as batteries or voltage adapters. [0003] For the above-mentioned power supply equipment, it is necessary to check whether the output voltage is normal before leaving the factory. The current detection method usually uses a multimeter for measurement. This method has a relatively low accuracy rate on the one hand and a slower speed on the other hand. [0004] In view of this, it is necessary to develop a voltage detection circuit to solve the above problems. 【Content of invention】 [0005] Therefore, the purpose of the present invention is to provide a voltage detection circuit ...

AI Technical Summary

Problems solved by technology

[0005] Therefore, the purpose of the present invention is to provide a voltage detection circuit to solve the problem of low accuracy and slow speed of detection of the output voltage of the battery and power adapter.

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