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High-precision voltage detection circuit and detection method

A voltage detection circuit, high-precision technology, applied in the direction of measuring current/voltage, measuring electricity, measuring devices, etc., can solve the problems of high implementation cost, low measurement accuracy, and large influence of ambient temperature

Active Publication Date: 2021-09-10
DONGFENG MOTOR GRP
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Problems solved by technology

The high-voltage power battery management system usually uses a dedicated chip to measure the power battery voltage. The measurement accuracy is not high, and it is greatly affected by the ambient temperature, and the cost of the dedicated chip is not low.
A high-precision sensor usually requires a high-precision ADC chip to achieve high-precision measurement, and its implementation cost is high

Method used

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  • High-precision voltage detection circuit and detection method
  • High-precision voltage detection circuit and detection method

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Embodiment Construction

[0037] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0038] see figure 1 , the embodiment of the present invention includes 16 modules, which are anti-reverse connection and EMC protection circuit, controlled power supply circuit, high-precision power supply reference circuit 1, high-precision power supply reference circuit 2, two type 1 isolation analog switches, type 2 Isolation analog switch, type 3 isolation analog switch, voltage divider filter circuit, temperature detection circuit, uC (microprocessor), 4 interlock circuits and GNDnet-tie circuit. "BAT+" and "GND" are connected to the positive and negative poles of the car battery, and "A_ExtIn" is connected to the measured voltage. The measured voltage can be the positive pole of the battery, or the output of a high-precision DC voltage isolation detection circuit, or output of the sensor. "uC" sequentially samples the voltage ...

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Abstract

The present invention provides a high-precision voltage detection circuit and detection method. A controllable power supply and an interlocking sampling circuit are adopted, and the use of a voltage division circuit is reduced, so that the function of measuring various circuit voltages with low cost and high precision is realized. The high-precision voltage detection circuit is used for accurately measuring low voltage such as storage battery voltage, sensor output voltage and the like, and high voltage such as high-voltage power battery voltage. The circuit provided by the invention adapts to different measurement requirements through expansion, cutting and recombination, and is high in universality and expansibility. The method is mainly realized through discrete devices and can be integrated in any controller, so that the installation space and the cost are saved.

Description

technical field [0001] The invention belongs to the technical field of automotive electronic controllers, and in particular relates to a high-precision voltage detection circuit and a detection method. Background technique [0002] With the continuous development of vehicle electrification and intelligence, in order to accurately obtain vehicle status information and precisely control the vehicle, the vehicle needs to measure more signals and requires higher measurement accuracy. Most of these signals are voltage signals or signals that can be converted into voltages, such as battery voltage, battery current, high-voltage power battery voltage, high-voltage power battery current, and analog voltage signals output by various sensors. In order to accurately calculate the power of the battery, it is necessary to accurately measure the battery voltage and battery current; in order to accurately obtain status information, a high-precision sensor and a high-precision measurement c...

Claims

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Application Information

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IPC IPC(8): G01R19/165G01R31/385
CPCG01R19/16504G01R31/385
Inventor 彭金城方利志李婷王赛孙宇航
Owner DONGFENG MOTOR GRP
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