Overcurrent detection protection circuit and electronic equipment
A protection circuit, overcurrent detection technology, applied in emergency protection circuit devices, circuit devices, emergency protection devices with automatic disconnection, etc. Use and guarantee the effect of maintenance time
Pending Publication Date: 2022-01-25
上海格立特电力电子有限公司 +1
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Problems solved by technology
[0003] However, after the driver detects that the overcurrent is eliminated, the shutdown pin port will change from high level to low level instantaneously, and the output waveform of the driver will be restored, so that the converter will immediately enter the working state, which will have potential safety hazards. Not good for users
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[0024] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, not all of them. the embodiment. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative efforts belong to the protection scope of the present invention.
[0025] Considering that after the existing driver detects that the overcurrent is eliminated, the shutdown pin port will change from high level to low level instantaneously, and the output waveform of the driver can be restored, so that the converter will immediately enter the working state, and there will be safety Hidden danger, not conducive to user use; based on this, an overcurrent detectio...
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The embodiment of the invention provides an overcurrent protection detection circuit and electronic equipment. A rectification voltage division circuit receives a load current and then carries out rectification voltage division processing on the load current to obtain a load processing voltage; the load processing voltage is input to a control circuit; when the control circuit detects that the load processing voltage exceeds a preset voltage, the control circuit outputs a high-level signal to a driver, so that the driver drives a load to stop running; a charging and discharging circuit performs charging until a preset charging threshold value is reached when the load stops running, so that the control circuit continuously sends a high-level signal to the driver when the charging and discharging circuit performs charging; and when charging reaches the preset charging threshold value, discharging is carried out until a preset discharging threshold value is reached, and the control circuit outputs a low-level signal to the driver, so that the driver drives the load to start running. According to the overcurrent detection protection circuit and the electronic equipment of the invention, the control circuit can continuously send the high-level signal to the driver when the charging and discharging circuit performs charging, and the control circuit sends the low-level signal to the driver when the discharging is completed, so that the maintenance time is ensured, and potential safety hazards are effectively reduced.
Description
technical field [0001] The invention relates to the technical field of circuit detection and protection, in particular to an overcurrent detection and protection circuit and electronic equipment. Background technique [0002] In power conversion and motor speed regulation, the driver has the advantages of both photoelectric isolation and electromagnetic isolation, and the design of the bootstrap power supply greatly simplifies the design of the drive power supply, so it is widely used in power drives. The driver has a shutdown pin port, which can be used as overcurrent and overvoltage protection. When an abnormal situation occurs, the shutdown pin port changes from low level to high level, and the high level output by the driver stops the converter. , to protect the system security. [0003] However, after the driver detects that the overcurrent is eliminated, the shutdown pin port will change from high level to low level instantaneously, and the output waveform of the driv...
Claims
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IPC IPC(8): H02H7/125H02H3/087H02H3/027H02H3/06
CPCH02H7/12H02H7/1252H02H3/087H02H3/027H02H3/066
Inventor 王捷
Owner 上海格立特电力电子有限公司