Light emission control device, light source device, and projection-type video display apparatus
AssigneeSeiko Epson Corporation
InventorAtsushi Yamada
Life of this patent
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Abstract
A light emission control device includes a power source circuit for a drive circuit that supplies a power for a drive circuit based on an input power, a power source circuit for a control circuit that supplies a power for a control circuit based on the input power, a control circuit, a drive circuit, and a start control circuit. The control circuit outputs a control signal for controlling turning on/off of a switching element. The drive circuit outputs a drive signal for driving the switching element based on the control signal. The start control circuit outputs a start control signal for delaying a timing at which the output of the drive signal is started after the input power is turned on.
Claims12
A light emission control device for controlling a switching element of a light source circuit, the light source circuit including a resistor, a light emission element, the switching element, and an inductor provided in series between a first power node and a second power node, the device comprising:
- a first power supply circuit that supplies a first power supply voltage based on an input power;
- a second power supply circuit that supplies a second power supply voltage based on the input power;
- a control circuit that is operated by the second power supply voltage and outputs a control signal for controlling turning on/off of the switching element;
- a drive circuit that is operated by the first power supply voltage and outputs a drive signal for driving the switching element based on the control signal;
- and
- a start control circuit, wherein
- the start control circuit outputs a start control signal for delaying a timing at which an output of the drive signal is started after the input power is turned on.
Dependencies are inferred from the claim text.