A chopper type DC current detection method and circuit
A technology of direct current and detection method, which is applied in the direction of measurement using digital measurement technology, can solve problems such as signal distortion, and achieve the effect of improving adaptability
Active Publication Date: 2017-12-15
武汉精能电子技术有限公司 +1
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[0006] In view of the above defects or improvement needs of the prior art, the present invention provides a chopper-type DC current detection method and circuit, the purpose of which is to eliminate the influence of low-frequency noise and offset voltage on the detection results, and solve the problem of existing DC current detection technology. Technical issues with signal distortion in
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[0046] In order to make the object, technical solution and advantages of the present invention more clear, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not constitute a conflict with each other.
[0047] The chopper-type DC current detection circuit and method provided by the present invention collect the forward voltage and reverse voltage at both ends of the shunt resistor in real time, and calculate the average after subtracting the forward and reverse voltages in the same chopping cycle. Obtain the DC voltage detection value, and then further obtain the current detection value.
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The invention discloses a chopper-type direct current detection method and a circuit. A forward voltage and a backward voltage of two ends of a shunt resistor are continuously collected in real time through a certain frequency. A sampling value of a first half of a chopper period and a sampling value of a second half of the chopper period in a same chopper period are calculated and influences of a low-frequency noise, an offset voltage and other noises on a detection result are eliminated. The detection circuit comprises a shunt resistor, a simulation switch, an amplifier, an analog-to-digital converter and a control unit. The simulation switch is connected in parallel to two ends of the shunt resistor. An input terminal of the amplifier is connected to an output terminal of the simulation switch. An input terminal of the analog-to-digital converter is connected to an output terminal of the amplifier. An input terminal of the control unit is connected to an output terminal of the analog-to-digital converter. An output terminal of the control unit is connected to a control signal input terminal of the simulation switch. On one hand, the control unit provides a digital signal to control switching of the simulation switch; on the other hand, according to digital forward and backward voltage signal, the control unit acquires a direct current detection value. A circuit structure provided in the invention is simple; test accuracy is high and cost is low.
Description
technical field [0001] The invention belongs to the technical field of direct current detection, and more specifically relates to a chopping type direct current detection method and circuit. Background technique [0002] The existing DC current detection method is to connect a shunt resistor in series on the bus, and detect the current flowing through the shunt resistor by detecting the terminal voltage of the shunt resistor; when the bus current is small, the terminal voltage signal of the shunt resistor is small and must pass through the amplifier Perform signal conditioning; limited by the noise of existing signal conditioning devices, when the current is extremely small, the signal-to-noise ratio is extremely low, resulting in signal distortion, and it is difficult to accurately detect the current value; specifically, the signal distortion is mainly affected by the following factors : [0003] The noise of the amplifier, the filter is difficult to deal with the low-freq...
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IPC IPC(8): G01R19/25
Inventor 彭骞胡国锋严运思沈亚非陈凯
Owner 武汉精能电子技术有限公司