Automatic current detection circuit

Abstract

The invention discloses an automatic current detection circuit which comprises a load connection unit and a load detection unit. The load connection unit is connected with a load; and the load detection unit comprises a difference amplifier and a detection resistor. The difference amplifier comprises first and second power ends, first and second input end, an output end and a difference amplification circuit, the first input end is connected with a first input signal, the second input end is connected with a second input signal, and the difference amplification circuit composed of MOS tubes isconnected among the first and second power ends, the first and second input ends and the output end in a controllable way. The detection resistor is connected to a branch of the first input signal torealize a current detection function. The automatic current detection circuit has the advantages that the detection resistor is arranged additionally to realize the current detection function, a reference voltage is generated in the circuit, very low capacitive load change can be detected, an error of an operation amplifier output is designed to offset technical deviation, and detection is accurate and errorless.

Description

technical field [0001] The invention relates to the technical field of electronic circuit detection, in particular to an automatic current 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 r...

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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; (4) If the load capacitance is small, the voltage variation range is small, and it may not be detected

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