Self-powered circuit system and method

Abstract

A self-powered circuit system comprises a high-voltage input terminal, a reference voltage end, a first resistive element, a current control module, a logic control module, a first switch, a second switch, a third switch and a capacitor element. The logic control module is respectively connected with control ports of the first switch, the second switch and the third switch; the first switch is used for amplifying current; the logic control module and the third switch are connected to the first end of the capacitor element. The second switch and the reference voltage end are connected to the second end of the capacitor element. The first resistive element, the logic control module and the first switch are respectively connected with the current control module; the first resistive element and the first switch are respectively connected to the high voltage input terminal; the first switch and the third switch are connected to the second switch through the same point. According to the invention, the starting time of the system is kept fixed under the condition that the input voltages of the high-voltage input terminal are different. And meanwhile, the system no-load power consumption after starting is greatly reduced.

Description

technical field [0001] The invention belongs to the field of electric power conversion, and more particularly, relates to a self-powered circuit system and method. Background technique [0002] With the miniaturization and thinning of household appliances, battery-powered devices are becoming more and more popular. At the same time, the portability of the device is also more and more demanding on the volume and weight of the charging device. Therefore, a volume-saving device The AC-to-DC technology controlled by the self-powered primary side has been popularized. At present, the mainstream self-powered primary-side control structure is the AC-to-DC technology: the system starts up through a high-voltage starting resistor, and after starting, it controls the on-off of the power tube on the high-voltage side for itself. The current required to drive the system. After the system turns off the drive, the current on the high-voltage start-up resistor will be transferred to the gr...

AI Technical Summary

Problems solved by technology

[0002] With the miniaturization and thinning of household appliances, battery-powered devices are becoming more and more popular. At the same time, the portability of devices has become more and more demanding on the volume and weight of charging devices. Therefore, a volume-saving The AC-to-DC technology of self-powered primary-side control is popularized. At present, the mainstream self-powered primary-side control structure AC-to-DC technology: the system is started by a high-voltage starting resistor, and after startup, the power tube on the high-voltage side is controlled to provide power for itself. The current required to drive the technical solution. After the system turns off the drive, the current on the high-voltage start-up resistor will be transferred to the ground, resulting in an increase in the system’s standby power consumption. When the system is no-load, the standby power consumption increases more significantly.

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