Circuit for detecting resistance value and device for detecting resistance value
A technology for detecting resistors and circuits is applied in the field of devices for detecting resistance values and circuits for detecting resistance values, which can solve problems such as inaccurate calculation of CC resistance values, and achieve the effects of accurate resistance values and solving inaccurate calculations.
Pending Publication Date: 2022-08-02
WEICHAI POWER CO LTD +1
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[0003] The main purpose of this application is to provide a circuit for detecting resistance value and a device for detecting resistance value, so as to solve the problem of inaccurate calculation of CC resistance value in the prior art
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[0023] It should be noted that the embodiments in the present application and the features of the embodiments may be combined with each other in the case of no conflict. The present application will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.
[0024] In order to make those skilled in the art better understand the solutions of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only The embodiments are part of the present application, but not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present application.
[0025] It shou...
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The invention provides a circuit for detecting a resistance value and a device for detecting the resistance value. The circuit comprises a constant current source switching unit which comprises a switch module, a first constant current source and a second constant current source; the signal detecting and processing unit is used for controlling the first end of the switch module to be connected with the second end of the switch module or controlling the first end of the switch module to be connected with the third end of the switch module, and the signal detecting and processing unit is further used for detecting the voltage value of the CC resistor unit to be detected and determining the resistance value of the CC resistor unit to be detected according to the voltage value and the current value. By switching the first constant current source and the second constant current source, different currents flow through the to-be-detected CC resistor unit, different voltage values are detected, the resistance value of the to-be-detected CC resistor unit can be calculated through the different voltage values and the different current values, then it is guaranteed that the calculated resistance value of the to-be-detected CC resistor unit is accurate, and the detection accuracy of the to-be-detected CC resistor unit is improved. Therefore, the problem of inaccurate calculation of the CC resistance value in the prior art is solved.
Description
technical field [0001] The present application relates to the field of electric vehicles, and in particular, to a circuit for detecting resistance value and a device for detecting resistance value. Background technique [0002] With the increasing number of electronic control units on electric vehicles, in order to reduce the wiring harness connection cost of the electronic control unit and ensure the reliable grounding of the electronic control power supply, under the condition of convenient installation, the chassis of the car is used as the grounding ground (connect the positive electrode of the battery and the generator to the ground). Or the negative pole is connected to the frame of the car, so that the frame is positively or negatively charged, so that all the electrical equipment of the car installed on the frame only needs a wire drawn from the other pole of the power supply to form a loop, that is, the car power supply The first level of the system is connected wit...
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IPC IPC(8): G01R27/08G01R31/389G01R31/396
CPCG01R27/08G01R31/389G01R31/396Y02T90/12
Inventor 黄枭凯徐童辉张国花曹学自李元
Owner WEICHAI POWER CO LTD