Current detection circuit

A technology for current detection circuits and products to be tested. It is applied in the direction of measuring current/voltage, measuring devices, and measuring electrical variables. It can solve problems such as inaccurate measurement of small currents, and achieve the effect of improving detection accuracy and detection efficiency.

Pending Publication Date: 2017-06-30
SHENZHEN SHENGDEJIN TECH CO LTD
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  • Abstract
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  • Claims
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Problems solved by technology

Thus, resulting in inaccurate

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Embodiment Construction

[0023] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0024] Such as figure 2 As shown, it is a block diagram of the connection between the current detection circuit 10 of the preferred embodiment of the present invention and a product 20 to be tested. The current detection circuit 10 is used to detect the current of the product 20 under test. In this embodiment, the product under test 20 is an electronic watch, and the current detection circuit 10 is used to measure the working current of the electronic watch. Of course, it can be understood that the product under test 20 can also be other precision electronic equipment or integrated circuits.

[0025] Such as image 3 As shown, the current detection circuit 10 includes an operational amplifier U2 , a sampling unit 30 , an adjustment unit 50 and a measurement unit 60 . In this embodiment, the measurement unit 60 is a voltage detection device. The no...

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Abstract

The invention provides a current detection circuit used for detecting the current through a product to be detected. The current detection circuit comprises an operational amplifier, a sampling unit, an adjusting unit and a measuring unit. The product to be detected is connected in series with the sampling unit and is connected between a voltage source and the ground, the operational amplifier comprises a first input terminal, a second input terminal, a first adjusting terminal and a second adjusting terminal, the first input terminal and the second input terminal are connected with two ends of the sampling unit, two ends of the adjusting unit are respectively connected with the first adjusting terminal and the second adjusting terminal, and therefore the adjusting unit can adjust the amplification factor of the operational amplifier, and the measuring unit is connected with the output terminal of the operational amplifier. The current detection circuit can detect and calculate minimal current signals of precision electronic devices such as watches or integrated circuits conveniently and accurately, and therefore the detection precision and the detection efficiency are improved.

Description

[0001] 【Technical field】 [0002] The invention relates to a current detection circuit. [0003] 【Background technique】 [0004] Current is an important parameter in the international value system, which is inseparable from the development of human science and technology, and is also the basic research object of electronic measurement technology and instruments. When the magnitude of the current signal is small to a certain extent, such as micro-ampere, milliampere, or even picoampere-level small currents, it becomes very complicated and difficult to accurately measure it. However, in the fields of precision electronic measurement, semiconductor integrated circuit testing, aerospace measurement and control, research on new nanomaterials, and analytical testing required for the development of life sciences, it is required to accurately capture and measure this weak signal. [0005] At present, commonly used methods for measuring small currents include the sampling resistor meth...

Claims

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Application Information

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IPC IPC(8): G01R19/00
CPCG01R19/00
Inventor 孙宇航唐桐升孙轶群
Owner SHENZHEN SHENGDEJIN TECH CO LTD
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