Bidirectional current detection circuit

Abstract

The invention discloses a bidirectional current detection circuit. The bidirectional current detection circuit comprises an operational amplifier U1, an operational amplifier U2, an MOSFET V1 and an MOSFET V2, wherein the in-phase input end of the operational amplifier U1 is connected in series with the positive pole of an input resistor R11, the negative pole of the resistor R11 is connected withthe positive pole of a battery, the negative pole of the battery is grounded, the negative pole of the battery is connected in series with the positive pole of a sampling resistor R4, and the negative pole of the resistor R4 is connected with a POWER connection terminal. According to the bidirectional current detection circuit, one set of detection circuit composed of two levels of operational amplifiers and a voltage-dividing resistor network is adopted, bidirectional currents can be detected, and two sets of detection circuits are not needed; and amplified detection voltage is directly adopted for power supply, it is not needed to adopt an auxiliary power source to supply power to the operational amplifier U1, therefore, components are reduced, PCB space is saved, and cost is lowered.

Description

technical field [0001] The invention relates to the technical field of current detection, in particular to a bidirectional current detection circuit. Background technique [0002] In order to accurately control the output current of the bidirectional power supply, the conventional method is to use a dual operational amplifier to amplify the voltage signal on the sampling resistor, and then feed the amplified signal voltage back to the control terminal to achieve the purpose of controlling the output current. [0003] Since the existing method requires auxiliary power supply and cannot handle the polarity of bidirectional current well, it is necessary to run two acquisition lines and power supply lines to the operational amplifier during design, which increases the difficulty of wiring and reduces the PCB area. increase; based on the above problems, a bidirectional current detection circuit is provided. Contents of the invention [0004] In order to solve the problem that ...

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Problems solved by technology

[0004] In order to solve the problem that the existing auxiliary power supply is required, the wiring is difficult, and the area of ​​the PCB board is increased, the purpose of the present invention is to provide a bidirectional current detection circuit, which can realize bidirectional current detection without auxiliary power supply, reduce components and The advantages of saving PCB board space and reducing costs to solve the problems raised in the above background technology

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