Negative voltage detecting device and detecting method

Abstract

The invention discloses a negative voltage detecting device and detecting method. A gating circuit, an RC (resistance-capacitance) circuit, a timer and a processor are arranged; to-be-detected negative voltage and the RC circuit are connected firstly through the gating circuit, a capacitor in the RC circuit is charged through the to-be-detected negative voltage, positive-polarity reference voltage is switched to and is connected with the RC circuit after charging of the capacitor ends, the capacitor is controlled to discharge, a timer is started for timing, and discharge time T2 of the capacitor is recorded; and a negative voltage value can be calculated according to a amplitude value of the reference voltage, charge time T1 of the capacitor by the reference voltage and the discharge time T2. A voltage value of the negative voltage is quantified to a time value and is reversely detruded by means of the corresponding quantified time value of the known reference voltage, the detecting algorithm is simple, the detection accuracy of the voltage value is high, a hardware circuit required to be established is simple, the cost is low, and power consumption is low.

Description

technical field [0001] The invention belongs to the technical field of voltage detection, and in particular relates to a detection device and a detection method for measuring negative voltage. Background technique [0002] In the field of electronic engineering design, negative voltages are often used. For example, many current LCD displays are driven by negative voltages. In order to ensure the power safety of electronic devices powered or driven by negative voltages, it is necessary to detect the magnitude of these negative voltages. It is very difficult to directly quantify the value of negative voltages using a single-chip microcomputer. Therefore, most of the existing detection circuits designed for negative voltage convert the negative voltage into a positive voltage, and then use a voltage divider circuit to step down the converted positive voltage and transmit it to the analog-to-digital converter to calculate the value of the negative voltage. . This traditional n...

AI Technical Summary

Problems solved by technology

This traditional negative voltage detection method has a complex circuit structure and low detection accuracy. Because resistors need to be introduced into the circuit for voltage division and sampling, it will cause a significant increase in system power consumption, and it is not suitable for some applications that require high energy consumption. application in electronic products

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