CPC B60J 1/20 (2013.01) [B60J 3/04 (2013.01); E06B 9/24 (2013.01); E06B 2009/2464 (2013.01); G02F 1/1334 (2013.01); G02F 1/172 (2013.01)] | 9 Claims |
1. An automotive glazing roof with variable light transmission system, comprising:
at least one laminate having:
at least two glass layers;
at least one plastic interlayer between the at least two glass layers;
at least one variable light transmission film that varies the light transmission in response to a control signal, wherein the at least one variable light transmission film is electrically connected and partitioned to form at least one independent circuit;
a control module that provides a control signal to each at least one variable light transmission film circuit; and
wherein the control module converts a DC voltage to the voltage of the at least one variable light transmission film with a single flyback converter;
wherein the flyback converter is a DC-to-DC flyback converter controlled by a micro-controller;
wherein the micro-controller generates pulse width modulating output signals distributed to at least one H-bridge circuit which delivers an output signal;
wherein the output signal of the H-bridge circuit is alternating current (AC) and is substantially a sine wave; and
wherein the sine wave amplitude is controlled by varying the duty cycle of the pulse width modulating output signals of the micro-controller.
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