US 12,168,390 B2
Multiple circuit variable light transmission glazing system
Mario Arturo Mannheim Astete, Lima (PE); Jose Roman Carrillo Rojas, Lima (PE); and Ian Jarm Riofrio Véliz, Lima (PE)
Assigned to AGP America S.A., Panama (PA)
Filed by AGP America S.A., Ciudad de Panama (PA)
Filed on Feb. 5, 2022, as Appl. No. 17/665,519.
Claims priority of provisional application 63/146,597, filed on Feb. 6, 2021.
Claims priority of provisional application 63/146,234, filed on Feb. 5, 2021.
Prior Publication US 2022/0250448 A1, Aug. 11, 2022
Int. Cl. B60J 1/20 (2006.01); B60J 3/04 (2006.01); E06B 9/24 (2006.01); G02F 1/1334 (2006.01); G02F 1/17 (2019.01)
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
OG exemplary drawing
 
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.