Bidirectionally-conducted large-current load switch circuit, switch power supply and electronic equipment

Abstract

The invention relates to a bidirectionally-conducted large-current load switch circuit, a switch power supply and electronic equipment. In the switch circuit, a pin 1 of a switch driver MK1 is connected with a gate of a first MOS tube Q1, a pin 2 of the switch driver MK1 is connected with a gate of a second MOS tube Q2, a source of the first MOS tube Q1 is connected with a source of the second MOStube Q2, a drain of the first MOS tube Q1 is used for connecting a power supply B1, a drain of the second MOS tube Q2 is used for connecting the power supply B1 by a load R1, a first diode D1 is a bypass of the first MOS tube Q1, and a second diode D2 is a bypass of the second MOS tube Q2. Sources of two large-current MOW tubes are connected, and gate poles of the MOS tubes are driven to achievecontrol on a load switch; meanwhile, bidirectional conduction of a loop is achieved by matching of the diodes of the bypasses, no discharging and arc discharging phenomenon is generated, the current fault rate of a product is almost zero, and the quality guarantee period of the product is prolonged.

Description

Technical field [0001] The present invention relates to the field of load switch circuits, and more specifically, particularly to load switch circuits with large currents or large switching moment peak currents, and to a bidirectional large current load switch circuit, switching power supply and electronic equipment, which are effective Prevent the load switch from being damaged due to the large surge current at the moment of action. Background technique [0002] When the high-current switching circuit is started, a large surge current can be generated at the moment of action, causing damage to the switching devices of the equipment. Nowadays, high-current switches in the market mostly use mechanical switching devices such as relays or contactors. The principle is to use the coil to flow current to generate a magnetic field, and the magnetic field attracts the contact shrapnel to close the contact to achieve the purpose of controlling the load switch. This application contact wi...

AI Technical Summary

Problems solved by technology

This application contact will produce sparks and arcing at the moment of closing or opening, which will affect the performance and life of the switch

Some power semiconductor devices are also used to realize high-current switching, but they are all unidirectional, which requires the directionality of power supply and affects the experience of terminal use.

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