Patent ID: 8935544
Filing Date: 2015-01-13
Classification: G06F,H05B,Y02B

Abstract:
1. An indicator light control circuit, comprising: a basic input output system (BIOS) integrated circuit (IC); a microcontroller electrically connected the BIOS IC and comprising a general purpose input output (GPIO) pin; a matching circuit comprising a first power supply and a first pull-up resistor, the first power supply electrically connected to the GPIO pin of the microcontroller through the first pull-up resistor to increase output voltage of the GPIO pin; a signal control unit electrically connected to the GPIO pin; an electronic switch electrically connected to the signal control unit; and an indicator light electrically connected to the electronic switch, wherein when different operating options of the indicator light are set into and by the BIOS IC, the BIOS IC controls the GPIO pin of the microcontroller to output corresponding command signals, the signal control unit generates and outputs corresponding signals according to the command signals, and the electronic switch is selectively turned on or off to control the operation of the indicators; wherein the matching circuit is electrically connected between the microcontroller and the signal control unit, the matching circuit is capable of matching a voltage level between the GPIO pin and the signal control unit; wherein the matching circuit further comprises a first transistor, a second power supply, a first current limiting resistor, and a second pull-up resistor, the first transistor comprises a base, a collector, and an emitter, the emitter of the first transistor is electrically connected to ground, the base of the first transistor is electrically connected to the GPIO pin through the first current limiting resistor, and the collector is electrically connected to the second power supply through the second pull-up resistor, the second pull-up resistor increases the output voltage of the collector of the first transistor.