Supply current detection method and circuit
A technology for detecting circuit and power supply current, applied in power supply testing, measuring current/voltage, measuring device, etc., can solve the problems of large heat generation of the shunt, inability to meet the detection accuracy, and large detection error, and achieve the effect of improving the measurement accuracy
Active Publication Date: 2015-07-22
HUAWEI DIGITAL POWER TECH CO LTD
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[0003] For the current application scenarios of high current such as 1000A and 10000A power supply, it is necessary to choose a shunt that supports a larger current (that is, a larger specification). The larger current will cause the shunt to generate a lot of heat, resulting in a large detection error, which cannot meet the detection accuracy. needs
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[0023] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.
[0024] Figure 1A A schematic structural diagram of a power supply current detection circuit provided by an embodiment of the present invention. As shown in FIG. 1 , the power supply current detection circuit of this embodiment includes: an amplification circuit 10 , a detection circuit 11 , a code value sampling circuit 14 and a control circuit 1...
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The invention provides a supply current detection method and a circuit, wherein the circuit comprises a detection circuit, an amplifying circuit, a code value sampling circuit and a control circuit, and the detection circuit is controlled by a control circuit so as to respectively input an object reference signal and a signal to be detected to the amplifying circuit; the amplifying circuit is controlled by the control circuit so as to respectively carry out treatment on the object reference signal and the signal to be detected; the code value sampling circuit can respectively sample the object reference signal and the signal to be detected after amplification to obtain a voltage sampling value of the reference signal and a voltage sampling value of the signal to be detected; and the control circuit calculates to the voltage value of the signal to be detected according to the voltage sampling value of the reference signal, the voltage sampling value of the signal to be detected and the voltage value of the object reference signal. According to the technical scheme in the invention, the object reference signal is taken as a base so as to adopt a relative measurement method, thereby improving measuring accuracy.
Description
technical field [0001] The invention relates to power supply detection technology, in particular to a power supply current detection method and circuit. Background technique [0002] Power supply current detection has always been an important point and a difficulty in detecting the current of various power sources (such as storage batteries). At present, the detection of the power supply current is mainly through the shunt (actually a small resistance value, used to detect the DC current) connected in series in the circuit, and then the detection of the power supply current is realized in a differential way. Figure 1 is a circuit diagram for detecting power supply current at present. As shown in FIG. 1 , a shunt 11 is connected in series with a power supply 12 , and an operational amplifier (op amp for short) 13 is connected in parallel on both sides of the shunt 11 . [0003] For the current application scenarios of high current such as 1000A and 10000A power supply, it i...
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IPC IPC(8): G01R31/40G01R19/00
Inventor 邹正华侯鹏
Owner HUAWEI DIGITAL POWER TECH CO LTD