High-side current sampling circuit

A technology of current sampling and sampling resistance, which is applied in the direction of measuring current/voltage, measuring electrical variables, measuring devices, etc., can solve the problems of inability to use data and difficulty in sampling high-end current, and achieve the effect of difficult conversion technology.

Inactive Publication Date: 2012-11-07
BEIJING JINGWEI HIRAIN TECH CO INC
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  • Abstract
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  • Claims
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Problems solved by technology

[0003] In the prior art, the reference point for sampling by the high-end current sampling circuit is not the ground but the power supply of the sampled circuit. However, in the electrical environment of a car, the power supply varies greatly. For example, the power supply of a passenger car varies within 9 -16V, commercial vehicles are 18-32V, so the sampled voltage will change with the power supply, at this time, the reference point of current sampling is changing, and the collected data cannot be applied
[0004] It can be seen that the existing high-end current sampling circuit has the disadvantage of taking the power supply as a reference for sampling, which brings difficulties to high-side current sampling

Method used

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Embodiment Construction

[0027] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0028] The embodiment of the present invention provides a high-end current sampling circuit, please refer to figure 1 , the high-side current sampling circuit includes a sampling resistor R4 and a differential amplifier circuit 100, wherein:

[0029] The sampling resistor R4 is connected in series with the high voltage end of the sampled cir...

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Abstract

The invention discloses a high-side current sampling circuit comprising a sampling resistor R4 and a differential amplifier circuit, wherein the sampling resistor R4 is connected in series to a high voltage end of a sampled circuit; the differential amplifier circuit is connected to two ends of the sampling resistor R4 and comprises a grounding end which is grounded and used for amplifying and outputting the voltages at two ends of the sampling resistor R4, and the amplified voltage takes the grounding end as a reference point. As the differential amplifier circuit of the high-side current sampling circuit comprises the grounding end which is grounded, and the voltage amplified by the differential amplifying circuit, i.e., the sampling voltage, takes the grounding end as the reference point, the defect that the high-side current sampling circuit in the prior art is used for sampling by taking a power supply as the reference point is avoided and the technical problem is effectively changed.

Description

technical field [0001] The invention belongs to the technical field of current sampling and detection, and in particular relates to a high-end current sampling circuit. Background technique [0002] The high-end current sampling circuit is used in the technical field of current sampling and detection. By analyzing the sampling signal of the high-end current sampling circuit, the current of the sampled circuit can be detected, and then it can be detected whether there is a fault in the sampled circuit and what faults exist, and corresponding protection measures can be taken for the sampled circuit in time for the existing faults. [0003] In the prior art, the reference point for sampling by the high-end current sampling circuit is not the ground but the power supply of the sampled circuit. However, in the electrical environment of a car, the power supply varies greatly. For example, the power supply of a passenger car varies within 9 -16V, commercial vehicles are 18-32V, so...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R19/00
Inventor 章新刚贾秀敏
Owner BEIJING JINGWEI HIRAIN TECH CO INC
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