A voltage mutation detection circuit, reset circuit and electronic device

Abstract

Provided are a circuit for detecting an abrupt change in a voltage, a reset circuit and an electronic device. The circuit for detecting an abrupt change in a voltage comprises: a discharging circuit (1); and a bleeder circuit (2). The bleeder circuit (2) comprises a second capacitor (C2) and a third capacitor (C3) mutually connected in series. A connection point where the second capacitor (C2) and the third capacitor (C3) are connected is an output terminal of the bleeder circuit (2). The other end of the second capacitor (C2) is connected to a controlling power source (VCC). The other end of the third capacitor (C3) is connected to ground. Upon an abrupt change in a voltage of the controlling power source (VCC), the output terminal of the bleeder circuit (2) outputs a first level signal. The discharging circuit (1) comprises a fourth resistor (R4). The fourth resistor (R4) has one end connected with the end of the second capacitor (C2) connected to the power source and the other end connected with the end of the third capacitor (C3) connected to ground and is thus also connected to ground. The circuit for detecting an abrupt change in a voltage, the reset circuit and the electronic device can sensitively detect a fluctuation in a power source and provide a control signal in real time for subsequent processing.

Description

technical field [0001] The invention relates to the field of electronic circuits, more specifically, to a voltage mutation detection circuit, a reset circuit and an electronic device. Background technique [0002] At present, in battery-powered systems, in order to protect the battery, the battery voltage is generally detected by the MCU, and the low-voltage protection point and protection unlock point are set. When the battery voltage is detected to be lower than the low-voltage protection point, the battery enters low-voltage protection and does not supply power to the system. , the system also goes into hibernation. After entering the dormant state, when it is detected that the battery voltage is higher than the protection unlocking point, the system will reset, exit the dormant state, and return to the normal state. [0003] However, when the battery does not supply power to the system, the battery voltage tends to rise. The rise rate is related to the battery capacity ...

AI Technical Summary

Problems solved by technology

[0003] However, when the battery does not supply power to the system, the battery voltage tends to rise. The rise rate is related to the battery capacity and the previous load. When the battery voltage rises to a certain level, if the protection unlock point is set too low, it may exceed the protection level. At the unlocking point, the system starts to work, and the battery starts to supply power again. There may be frequent protection and unlocking

On the other hand, if the protection unlock point is set too high, then replacing a battery with low power consumption may not work properly

This makes setting the protection unlock point very difficult

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