Current test circuit with adjustable detection accuracy
A technology of current testing and detection accuracy, applied in the direction of measuring current/voltage, measuring electricity, measuring electrical variables, etc., can solve the problems of inability to switch flexibly, low detection accuracy of current detection circuit, etc., to achieve wide current detection range, simple structure, The effect of high detection accuracy
Inactive Publication Date: 2019-05-14
SHENZHEN DOTHINKEY TECH
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Problems solved by technology
[0004] Aiming at the problems existing in the prior art, the main purpose of the present invention is to provide a current test circuit with adjustable detection accuracy, aiming at solving the problem that the existing mobile phone camera module current detection circuit has low detection accuracy and cannot be switched flexibly. question
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[0023] The invention proposes a current test circuit with adjustable detection precision.
[0024] refer to Figure 1-3 , figure 1 It is a working principle diagram of an embodiment of the current test circuit with adjustable detection accuracy of the present invention, figure 2 It is a connection structure diagram of the magnification control circuit and the operational amplifier circuit in an embodiment of the present invention, image 3 It is a working principle diagram of the current sampling circuit in an embodiment of the present invention.
[0025] like figure 1 As shown, in the embodiment of the present invention, the current test circuit with adjustable detection accuracy includes: a programmable controller 100, a current accuracy control circuit and an operational amplifier circuit 400, wherein the current accuracy control circuit includes a magnification factor control circuit 200 And the current sampling circuit 300. The first terminal of the amplification fa...
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The invention discloses a circuit with adjustable current detection accuracy. The circuit comprises a programmable controller, a current accuracy control circuit and an operational amplifier circuit,wherein the current accuracy control circuit comprises an amplification factor control circuit and a current sampling circuit; a first end of the amplification factor control circuit is connected withan IO interface of the programmable controller; a second end of the amplification factor control circuit is connected with a first input end of the operational amplifier circuit; a first end of the current sampling circuit is connected with the IO interface of the programmable controller; a second end of the current sampling circuit is connected with a second input end of the operational amplifier circuit; and an output end of the operational amplifier circuit is connected with an AD (Analog-to-Digital) conversion interface of the programmable controller. The circuit has the beneficial effects of adjustable current detection accuracy, high detection accuracy, capability of performing switching test on a camera module in a working state, a standby state and a power down state, flexible switching, simple structure, wide current detection range and high defection efficiency.
Description
technical field [0001] The invention relates to the technical field of current detection of a camera module of a mobile phone, in particular to a current test circuit with adjustable detection precision. Background technique [0002] Mobile phones are mobile devices that use batteries for power supply. The power consumption requirements are very strict. The current of the internal components of the mobile phone directly affects the power consumption and the battery life. Therefore, in the test of the mobile phone camera module, it is necessary to The current of the working state, standby state and power-off state of the camera module is tested. [0003] At present, the detection accuracy of the current detection circuit of the mobile phone camera module is not high, and it is impossible to accurately test the current of the camera module in the working state, standby state and power-off state, and the test circuit cannot be switched flexibly to test the camera module. Test ...
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IPC IPC(8): G01R19/00G01R31/02
Inventor 蒋思远
Owner SHENZHEN DOTHINKEY TECH