Automatic micro load detection circuit

Abstract

The invention discloses an automatic micro load detection circuit which comprises a load connection unit and a load detection unit. The load connection unit is connected with a load; the load detection unit comprises a differential amplifier; and the differential amplifier comprises a first power end connected to a first power voltage, a second power end connected to a second power voltage, a first input end connected with a first input signal, a second input end connected to a second input signal, an output end for outputting an output signal and a differential amplification circuit; the differential amplification circuit is composed of MOS tubes, and can be connected among the first power end, the second power end, the first input end, the second input end and the output end in a controllable way to amplify the first and second input ends in a differential way and further to output the output signal. The automatic micro load detection circuit has the advantages that a reference voltage is generated in the circuit, very low capacitive load change can be detected, an error of an operation amplifier output tube is designed to offset technical deviation, so that detection is accurateand errorless.

Description

technical field [0001] The invention relates to the technical field of electronic circuit detection, in particular to a micro load automatic detection circuit. Background technique [0002] There are uncertain factors when external loads are connected. At present, mobile energy storage devices are equipped with external load detection modules to protect mobile energy storage devices and prolong their service life. Usually, after the load is connected to the mobile energy storage device, the switch is manually turned on to start the power supply, and the module starts to detect the load. If the load leaves the mobile energy storage device and forgets to turn off the power switch, the detection module will continue to work and consume power, resulting in waste. [0003] In the prior art, there are the following problems in the detection module of the load: (1) the detection of the micro capacitive load is still a difficult problem; (2) the detection of the micro load needs to...

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Problems solved by technology

Usually, after the load is connected to the mobile energy storage device, the switch is manually turned on to start the power supply, and the module starts to detect the load. If the load leaves the mobile energy storage device and forgets to turn off the power switch, the detection module will continue to work and consume power, resulting in waste of

[0003] In the prior art, there are the following problems in the detection module of the load: (1) the detection of the micro capacitive load is still a difficult problem; (2) the detection of the micro load needs to rely on the existing design technology Accuracy; (3) For short-circuit protection, a separate detection circuit needs to be set, and a key recognition function also needs to be set

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