A current measuring circuit and method
A current measurement circuit and current sampling technology, applied in the direction of measuring electrical variables, measuring devices, voltage/current isolation, etc., can solve the problems of not being suitable for high-side current sampling systems, affecting the accuracy of sampling circuits, and low accuracy of current sampling, to achieve Overcome the effects of narrow input voltage range, reduced influence, and wide withstand voltage range
Active Publication Date: 2019-05-10
SHENZHEN AEROSPACE NEW POWER TECH +1
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Problems solved by technology
[0002] Traditional current sampling generally uses a sampling resistor to sample through a current mirror or a high-precision differential operational amplifier, but the input terminal of the differential operational amplifier can withstand a limited voltage, which is not suitable for a high-side current sampling system, and the sampling circuit and the power circuit share the same ground, making The power circuit part is easy to affect the accuracy of the sampling circuit part, which leads to problems such as low current sampling accuracy and narrow input voltage range
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[0022] The preferred embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings.
[0023] Such as figure 1 As shown, this example provides a current measurement circuit, including: a current sampling resistor, a first voltage sampling unit, a second voltage sampling unit, a first sample holder, a second sample holder and a differential amplifier unit, the current sampling One end of the resistor is connected to the first sample holder through the first voltage sampling unit, the other end of the current sampling resistor is connected to the second sample holder through the second voltage sampling unit, and the first sample holder and the second sample-and-hold device are respectively connected to the input end of the differential amplifier unit; wherein, by controlling the switches of the first voltage sampling unit and the second voltage sampling unit, the voltage at both ends of the current sampling resistor i...
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The invention provides a c current measurement circuit and method. The current measurement circuit comprises a current sampling resistor, a first voltage sampling unit, a second voltage sampling unit, a first sampling holder, a second sampling holder and a differential amplification unit, wherein one end of the current sampling resistor is connected with the first sampling holder through the first voltage sampling unit, the other end of the current sampling resistor is connected with the second sampling holder through the second voltage sampling unit, the first sampling holder and the second sampling holder are connected with the input end of the differential amplification unit, through controlling switches of the first voltage sampling switch and the second voltage sampling unit, voltages at the two ends of the current sampling resistor are copied and sampled, and then sampling is realized through differential amplification. According to the invention, a power circuit portion and a sampling circuit portion are not common-grounded, effective isolation is realized, the influences exerted by a power circuit on sampling precision are effectively reduced, and the voltage-withstanding scope of an input high side is wide.
Description
technical field [0001] The invention relates to a current measuring circuit, in particular to a current measuring circuit and a current measuring method using the current measuring circuit. Background technique [0002] Traditional current sampling generally uses a sampling resistor to sample through a current mirror or a high-precision differential operational amplifier, but the input terminal of the differential operational amplifier can withstand a limited voltage, which is not suitable for a high-side current sampling system, and the sampling circuit and the power circuit share the same ground, making The power circuit part is easy to affect the accuracy of the sampling circuit part, which leads to problems such as low current sampling accuracy and narrow input voltage range. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a current measurement circuit that can improve the accuracy of high-side current sampli...
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IPC IPC(8): G01R19/25G01R15/14
CPCG01R15/146G01R19/25
Inventor 赵敏陈红张东来王骞王超黎健辉
Owner SHENZHEN AEROSPACE NEW POWER TECH