Voltage comparison circuit and current detection system

Abstract

A voltage comparison circuit is provided. The voltage comparison circuit includes a voltage comparator, a voltage control circuit, and a reference voltage variable circuit. The voltage comparator compares an input voltage and a reference voltage, and outputs a first output voltage corresponding to the comparison result. The voltage control circuit receives the first output voltage and generates a second output voltage. The reference voltage variable circuit receives the second output voltage, and outputs the corresponding reference voltage to the voltage comparator. When the input voltage is greater or equal to the reference voltage, the first output voltage becomes zero, the second output voltage becomes a supply voltage, and the reference voltage becomes the maximum reference voltage. When the input voltage is smaller than the reference voltage, the first output voltage becomes the supply voltage, the second output voltage becomes zero, and the reference voltage becomes the minimum reference voltage.

Dependencies are inferred from the claim text.