Micro dimming glass driving power supply

Abstract

The invention discloses a micro dimming glass driving power supply that comprises a power supply circuit, a step-down circuit, a base time integrated circuit, a waveform time-delay circuit, an isolation circuit and an H bridge. The power supply circuit outputs 48V voltage to provide working voltage for the step-down circuit and the H bridge; the step-down circuit reduces 48V voltage to 5V voltageto provide working voltage for the base time integrated circuit, the waveform time delay circuit and the isolation circuit; the base time integrated circuit outputs square waves, the square waves generate symmetrical square waves through the waveform time delay circuit, the symmetrical square waves are isolated by the isolation circuit and then drive the field effect transistor to form an H bridge, and 48v symmetrical square wave voltage is output to drive the dimming glass to work. The whole circuit adopts a square wave circuit, and the voltage and the current on the dimming glass are not delayed, so that the power factor of the whole dimming glass power supply is close to 1; therefore, the dimming glass power supply can be miniaturized, the efficiency is improved, and the power consumption is reduced.

Description

technical field [0001] The invention relates to a dimming glass driving technology, in particular to a miniature dimming glass driving power supply. Background technique [0002] Dimming glass is a new type of special photoelectric glass product with a sandwich structure that combines liquid crystal film into the middle of two layers of glass and is glued under high temperature and high pressure. The glass itself not only has all the characteristics of safety glass, but also has the ability to control glass transparency and No privacy protection function, due to the characteristics of the liquid crystal film interlayer, the dimming glass can also be used as a projection screen, replacing ordinary curtains, and presenting high-definition images on the glass. [0003] However, the existing dimming glass drive power supplies on the market all use AC transformers to convert the AC mains 220V into 48V or 36V AC power to directly drive the dimming glass. Since the dimming glass i...

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is that the existing technology has problems such as large appearance, low efficiency and large power consumption.

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