Hardware over-current protection method and system for bidirectional current output

Abstract

The invention discloses a hardware over-current protection method and system for bidirectional current output. The input end of a modulation module is connected with an external input current; the output end of the modulation module is connected with the input end of a sampling module and the input end of a control switch; the output end of the sampling module is connected with the input end of amain control module; the first output end of the main control module is connected with the control end of the control switch; the output end of the control switch is used for current output; the sampling module is used for acquiring a first current signal by acquiring the current signal of the input end of the modulation module, and inverting the first current signal to obtain a second current signal; the main control module comprises a comparator and a gating module; the first current signal and the second current signal are connected with the gating module and then are connected with the first input end of the comparator; the second input end of the comparator is connected with a preset reference voltage Vref; and when a voltage of the first input end of the comparator is higher than thepreset reference voltage Vref, the main control module outputs a first control signal through the first output end to turn off the control switch so as to realize hardware over-current protection ofthe bidirectional current output.

Description

technical field [0001] The invention belongs to the field of current monitoring, and in particular relates to a hardware overcurrent protection method and system for bidirectional current output. Background technique [0002] At present, a new generation of green, energy-saving and environment-friendly power supply equipment or industrial electronic products has bidirectional output functions, such as regenerative electronic loads, high-voltage DC sources, and battery-forming capacity devices. These electronic devices need to control the current at the output terminal, and this current signal may work in opposite directions in different modes of operation. In order to prevent high current from damaging equipment, electronic equipment will use software or hardware to set overcurrent. [0003] Generally speaking, the software overcurrent protection is to sample the current signal and perform software analysis. In order to prevent false triggering from affecting the performanc...

AI Technical Summary

Problems solved by technology

The micro control unit MCU needs to detect positive and negative current overcurrent protection signals through two IO pins, and use two sets of comparators to compare and output positive current direction overcurrent protection signals and negative current direction overcurrent protection signals. For precision equipment, its negative direction current sampling voltage range is 0-V g , the positive direction current sampling voltage range is V g -V cc , therefore, the detectable current range of this hardware over-current protection method is relatively small in accuracy, and the protection signal detection pin needs two groups

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