Circuit and method for high-precision voltage detection

A voltage detection circuit, high-precision technology, applied in the direction of measuring current/voltage, measuring device, measuring electrical variables, etc., can solve problems such as excessive circuit overhead, and achieve the goal of eliminating offset voltage, improving voltage detection accuracy, and improving accuracy. Effect

Active Publication Date: 2014-01-08
JIANGSU BRMICO ELECTRONICS
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  • Abstract
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  • Claims
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Problems solved by technology

[0004] For the traditional voltage detection circuit scheme, a digital-to-analog converter is required to output digital signals, resulting in excessive circuit overhead and other shortcomings

Method used

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  • Circuit and method for high-precision voltage detection
  • Circuit and method for high-precision voltage detection
  • Circuit and method for high-precision voltage detection

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Embodiment Construction

[0034] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and understandable, the specific implementation modes of the present invention will be described in detail below in conjunction with the accompanying drawings, so that the above-mentioned and other purposes, features and advantages of the present invention will be clearer. Like reference numerals designate like parts throughout the drawings. The drawings have not been drawn to scale, emphasis instead being placed upon illustrating the gist of the invention.

[0035] Such as figure 1 As shown, a high-precision voltage detection circuit of the present invention includes a modulator, the modulator is a first-order Σ-Δ modulator, used to receive the voltage to be detected and a reference voltage, and output a modulated square wave signal, the The duty ratio of the modulated square wave signal is the ratio of the voltage to be detected to the reference voltage; the f...

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Abstract

The invention provides a high-precision voltage detection circuit, which comprises a modulator, a counter, a frequency divider module and an MCU (microprocessor control unit) processing module. The ratio of to-be-detected voltage to reference voltage is modulated into a modulation square wave signal through the modulator, the counter and the frequency divider, the voltage detection precision is determined by the ratio of high-level clock counting number to low-level clock counting number of the modulation square wave signal, and the counter and the frequency divider generate alternate feedback control signals to control the modulator, so the out-of-regulation voltage of the modulator is omitted, the voltage detection precision is greatly improved, the detection data is further corrected by the MCU processing module, and the accuracy of detection is improved again.

Description

technical field [0001] The invention relates to the field of digital-analog hybrid integrated circuit design, in particular to a voltage detection circuit controlled by a digital operation circuit and an interleaved signal fed back. Background technique [0002] Sensor is a commonly used electronic component. With the rapid development of integrated circuits, integrated sensors have also developed. Existing integrated sensors generally convert detection signals into voltage signals and then process them. Therefore, the detection of the voltage signal has become the key to the design of the integrated sensor, and the voltage detection circuit has become the core circuit in the sensor circuit, and its detection accuracy directly determines the effective accuracy of the overall sensor. [0003] In order to digitize the detection signal, existing voltage detection circuits basically use A / D conversion circuits. Depending on the application background, the optional conversion cir...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R19/25
CPCG01R19/255
Inventor 赵野周玉梅黑勇王洪祥
Owner JIANGSU BRMICO ELECTRONICS
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