Wide-range and high-precision current sampling method
A current sampling, high-precision technology, applied in voltage/current isolation, measuring current/voltage, measuring electrical variables, etc., can solve the problems of not adjusting current amplification in time, current sampling distortion, affecting control, etc., to improve current sampling The effect of high accuracy and data analyzability
Pending Publication Date: 2022-04-12
河南嘉晨智能控制股份有限公司
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Problems solved by technology
[0005] The above-mentioned existing technology can realize current sampling with multiple magnifications, but when one of the current magnifications is close to the maximum value of this range, the current magnification of a larger range is not adjusted in time, resulting in distortion of current sampling and affecting control, that is, there is no Simultaneous realization of high sampling range and high sampling accuracy
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[0020] Attached below figure 1 and figure 2 Describe in detail.
[0021] The present invention provides a wide-range, high-precision current sampling method, which mainly utilizes figure 1 As shown in the sampling circuit, the circuit at least includes an operational amplifier feedback resistor, that is, an operational amplifier feedback resistor, and multiple feedback resistors can be connected in series and / or in parallel and / or combined in series and parallel to form different amplification factors and different amplification factors. Multiples correspond to different current sampling ranges. The method therefore involves the following feedback resistor setting steps.
[0022] Among them, the operational amplifier is a component that amplifies the tiny current fluctuations in the circuit to the range that the detector can handle and detect. It is a component with a high magnification factor. It can amplify, reduce, and It can even perform differential or integral opera...
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A wide-range and high-precision current sampling method comprises the steps that a plurality of current sampling ranges starting from zero are set, the current sampling ranges have different upper limits, the sampling range with the large upper limit has lower sampling precision compared with the sampling range with the small upper limit, and when current sampling is executed, the sampling precision of the sampling range with the large upper limit is higher than that of the sampling range with the small upper limit. The operation of switching the sampling range to the next level or maintaining the sampling range in the sampling range is executed on the basis that the current value sampled currently is larger than the switching judgment value calculation value or smaller than the switching judgment value calculation value in the sampling range, and the switching judgment value is a numerical value between 0 and 1; the switching judgment value calculation value is the product of the switching judgment value and the sampling range.
Description
technical field [0001] The invention relates to the field of sampling, in particular to a wide-range and high-precision current sampling method. Background technique [0002] Current sampling is a basic content that needs to be involved in the process of electronic circuit product design, manufacturing, use and maintenance, etc. It usually has a variety of measurement sampling schemes, one is based on the way the current generates a voltage drop when passing through the resistance Direct detection, such as conventional ammeters and multimeters, is the solution used, which requires a sampling device to be connected in series with the circuit under test. The other is an indirect detection scheme, which usually uses a Hall sensor based on the Hall principle for sampling. The Hall effect is an effect in which the electric current in a conductive material interacts with a magnetic field to generate an electromotive force. The Hall effect measurement The principle of current can ...
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IPC IPC(8): G01R19/00G01R15/20
Inventor 潘振方李飞姚欣
Owner 河南嘉晨智能控制股份有限公司