Active mode current detecting system

Abstract

An active mode current testing system is used to detect the current passing through the circuit to be tested. The active mode current testing system uses a stable voltage node with an output electric potential to electrically connect with the circuit to be tested, and uses a control module, a voltage comparison circuit and a feedback voltage hysteresis circuit to feed back control the output electric potential, thereby the output electric potential conforms to a preset voltage value. The system furthermore contains a sensing resistor, connected in series with the circuit to be tested, the electric potential difference of the two terminals of the sensing resistor is acquired by the control module, and the current passing through the sensing resistor is calculated according as the voltage value of the sensing resistor, thereby the current variation of the circuit to be tested can be deducted.

Description

technical field [0001] The invention relates to an active current detection system, in particular to a detection system for active detection of micro-current changes. Background technique [0002] In various electronic products, circuit boards are indispensable for configuring electronic components. The circuit design of the circuit board will directly affect the operating performance of the electronic products. During the manufacturing process of the circuit board, due to the influence of various factors such as the quality of the electronic components or the poor process of the circuit board itself, it is easy to cause abnormal problems of excessive power consumption in electronic products. Take the computer motherboard as an example. The motherboard needs to record the setting parameters of peripheral devices and system operation. Therefore, a battery device and a memory device are provided on the main board to provide the main board to store these data parameters for a ...

AI Technical Summary

Problems solved by technology

However, the reason why excessive power consumption is not easy to be detected is that the current change to be measured in the circuit to be tested is too small (in the μA level), so it is not easy to measure the voltage change of the components on the circuit to be tested.

When inspectors use the three-purpose ammeter to detect the circuit to be tested, it is easy for the inspector to misjudge that there is no abnormal current change because the pointer changes little.

At the same time, the detection step of power consumption often takes a long time, the actual operation of the circuit under test to detect the change of current, and the inspector needs to perform more steps or use more sophisticated instruments to measure the voltage in the circuit under test. micro current change

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