LED drive control circuitry, electronic circuitry, and LED drive control method
AssigneesKabushiki Kaisha Toshiba, Toshiba Electronic Devices & Storage Corporation
InventorKatsuyuki Ikeuchi
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Abstract
LED drive control circuitry according to one embodiment outputs an LED drive control signal serving as driving a light emitting diode included in a photocoupler that performs insulation communication in synchronization with a reference clock signal. The LED drive control circuit includes a duty cycle changer that changes a duty cycle of the LED drive control signal in accordance with the reference clock signal and a signal synchronized with the reference clock signal.
Claims6
LED drive control circuitry that outputs an LED drive control signal serving to drive a light emitting diode included in a photocoupler, the photocoupler that performs insulation communication in synchronization with a reference clock signal, the LED drive control circuitry comprising:
- a duty cycle changer that lowers a mean of duty cycles of the LED drive control signal in accordance with the reference clock signal and a signal synchronized with the reference clock signal.
Electronic circuitry comprising:
- a photocoupler comprising a light emitting diode and a photodetector;
- a first signal processing circuit;
- and
- a second signal processing circuit, the electronic circuitry that performs insulation communication between the first signal processing circuit and the second signal processing circuit through the photocoupler, the circuitry further comprising
- a duty cycle changer that lowers a mean of duty cycles of an LED drive control signal in accordance with a reference clock signal and a signal synchronized with the reference clock signal, the LED drive control signal serving to drive the light emitting diode.
An LED drive control method for driving a light emitting diode included in a photocoupler, the photocoupler that performs insulation communication in synchronization with a reference clock signal, the method comprising:
- generating a signal synchronized with the reference clock signal;
- and
- lowering a mean of duty cycles of an LED drive control signal in accordance with the reference clock signal and a signal synchronized with the reference clock signal, the LED drive control signal serving to drive the light emitting diode.
Dependencies are inferred from the claim text.