Negative voltage detecting device and detecting method

A detection device and negative voltage technology, which is applied in the direction of measuring devices, measuring current/voltage, measuring electrical variables, etc., can solve problems such as complex circuit structure, low detection accuracy, and increased system power consumption, and achieve simple detection algorithms and detection The effect of high precision and simple hardware circuit

Active Publication Date: 2015-04-01
QINGDAO GOERTEK
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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

Method used

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  • Negative voltage detecting device and detecting method
  • Negative voltage detecting device and detecting method
  • Negative voltage detecting device and detecting method

Examples

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Example Embodiment

[0020] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

[0021] In order to simplify the hardware and software design of the negative voltage detection device, this embodiment proposes a design idea of ​​quantizing the voltage value into a time value, and deduces the voltage value corresponding to the time value according to the difference of the time value. Specifically, the known amplitude V REF The reference voltage is quantified as the time value T1, and then the negative voltage V to be detected I It is also quantified as the time value T2, and then the corresponding relationship between the voltage value and the time value is used: V REF / T1=-V I / T2, the value V of the negative voltage to be detected can be deduced I =-V REF *T2 / T1.

[0022] In order to quantify the voltage value as a time value, this embodiment is designed and implemented by charging and discharging the capacitor. Spe...

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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...

Claims

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Application Information

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IPC IPC(8): G01R19/00
Inventor 宋超杜洋
Owner QINGDAO GOERTEK
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