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High-side current detection device and system

A current detection device and high-side technology, which is applied in the direction of measuring devices, only measuring current, measuring current/voltage, etc., can solve the problems of poor measurement reliability and inability to accurately measure the sampling resistor voltage, so as to reduce interference and improve reliability and stability, and the effect of improving performance indicators

Pending Publication Date: 2020-04-24
SHANGHAI UNITED IMAGING HEALTHCARE
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AI Technical Summary

Problems solved by technology

[0004] Based on this, it is necessary to provide a high-side current detection device and system for the problem that the existing detection device cannot accurately measure the voltage on the sampling resistor and has poor measurement reliability.

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  • High-side current detection device and system

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Embodiment Construction

[0061] In order to make the above-mentioned purpose, features and advantages of the present application more obvious and understandable, the specific implementation manners of the present application will be described in detail below in conjunction with the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the application. However, the present application can be implemented in many other ways different from those described here, and those skilled in the art can make similar improvements without departing from the connotation of the present application. Therefore, the present application is not limited by the specific implementation disclosed below.

[0062] It should be noted that when an element is referred to as being “fixed” to another element, it can be directly on the other element or there can also be an intervening element. When an element is referred to as being "connected to" an...

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Abstract

The invention provides a high-side current detection device and system. The high-side current detection device comprises a sampling circuit, an isolation amplifier, a signal processing circuit and ananalog-to-digital conversion circuit. The first end of the sampling circuit is electrically connected with a power supply. The second end of the sampling circuit is electrically connected with a load.The isolation amplifier is connected in parallel with the two ends of the sampling circuit. The isolation amplifier is used for detecting voltage drop at two ends of the sampling circuit to obtain first detection voltage. The input end of the signal processing circuit is electrically connected with the output end of the isolation amplifier. The signal processing circuit is used for obtaining thefirst detection voltage and carrying out filtering and amplification processing on the first detection voltage to obtain a second detection voltage. The analog-to-digital conversion circuit is electrically connected with the output end of the signal processing circuit. The output end of the analog-to-digital conversion circuit is used for being electrically connected with an upper computer. And the analog-to-digital conversion circuit is used for acquiring a second detection voltage, converting the second detection voltage from the analog signal into a digital signal and sending the digital signal to the upper computer so as to determine the current value of the load.

Description

technical field [0001] The present application relates to the technical field of load current detection, in particular to a high-side current detection device and system. Background technique [0002] At present, to detect small currents in a high-voltage environment, the detection device used is to connect a sampling resistor in series on the high-voltage measured line, and add two voltage divider resistors between the two ends of the sampling resistor and the ground. Used to measure the voltage across the sampling resistor. At the same time, the differential amplifier is connected to obtain the voltage on the sampling resistor to calculate the current on the sampling resistor. [0003] However, in the actual measurement, since the voltage on the measured line is 5000V, the voltage dividing ratio of the two voltage dividing resistors is very large, so that the voltage dividing resistors cannot achieve the required accuracy. At the same time, because the current on the lin...

Claims

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Application Information

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IPC IPC(8): G01R19/00
CPCG01R19/0092
Inventor 洪期鸣杨延嗣王洪涛
Owner SHANGHAI UNITED IMAGING HEALTHCARE
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