Hysteresis voltage detection circuit

Abstract

The invention discloses a hysteresis voltage detection circuit, which belongs to the field of voltage detection circuits. The circuit comprises a voltage stabilizing unit, a first power switch, a first divider resistor, a second divider resistor, a third divider resistor and a second power switch. The voltage stabilizing unit is coupled to an adjustable voltage source. When both the first power switch and the second power switch are turned on, the first divider resistor, the second divider resistor and the third divider resistor divide the adjustable voltage source. When both the first power switch and the second power switch are turned off, the first divider resistor and the second divider resistor divide the adjustable voltage source. The hysteresis voltage detection circuit solves the technical problem that when a circuit in the prior art is used for detecting a transition point, the serious voltage level drift phenomenon is likely to occur due to the change of process tolerance orenvironment temperature, and the purposes of low cost, low power consumption and accurate control over the voltage hysteresis phenomenon are achieved.

Description

technical field [0001] The invention relates to a voltage detection circuit, in particular to a hysteresis voltage detection circuit for detecting voltage changes to control voltage hysteresis. Background technique [0002] In existing circuit implementations, generally speaking, the positive feedback function of the comparator is used to achieve voltage hysteresis. Furthermore, the phenomenon of traditional voltage hysteresis can be adjusted by a power switch to adjust the reference voltage, and a comparator can be used to generate a hysteresis voltage function. Traditionally, bipolar junction transistors (bipolar junction transistors, BJTs) used together with comparators are prone to severe voltage level drift due to process tolerances or changes in ambient temperature. During point detection (such as temperature protection, avoiding noise interference / misoperation, etc.), the accuracy of the operation point corresponding to the voltage hysteresis is not high, resulting i...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a hysteresis voltage detection circuit, which solves the problem that when the circuit in the prior art is used for transition point detection, it is prone to severe voltage level drift caused by process tolerance or ambient temperature change. Technical problem, to achieve the purpose of low cost, low power consumption and precise control of voltage hysteresis

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