Power supply switching device and method as well as projection device applying power supply switching device

• Main Authors: ZHANG YISHUN, WANG MAOAN
• Format: Patent
• Language: Chinese; English
• Published: 27.03.2013
• Subjects: ACCESSORIES THEREFOR; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USINGWAVES OTHER THAN OPTICAL WAVES; APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FORPROJECTING OR VIEWING THEM; CINEMATOGRAPHY; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTINGELECTRIC POWER; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; ELECTRICITY; ELECTROGRAPHY; GENERATION; HOLOGRAPHY; PHOTOGRAPHY; PHYSICS; SYSTEMS FOR STORING ELECTRIC ENERGY

A power switching device, a power switching method, and a projection device using the power switching device are provided. In the power switching method, a first power and a second power are received, and the voltage level of the first power is compared with the voltage level of the second power. One of the first power and the second power having the higher voltage level is sustained by using one of the first power and the second power having the lower voltage level until one of the first power and the second power having the higher voltage level stabilizes. At least one of the first power and the second power having the higher voltage level and being already stabilized is output as an output voltage.