DRIVE CIRCUIT, ILLUMINATION LIGHT SOURCE, AND LIGHTING APPARATUS
First Claim
1. A drive circuit for turning on a light-emitting element, the drive circuit comprisinga self-excited inverter which supplies power to the light-emitting element,wherein the self-excited inverter includes a thermistor, and depending on temperature dependency of the thermistor, supplies a first power value to the light-emitting element when a temperature is a first temperature, and a second power value to the light-emitting element when a temperature is a second temperature higher than the first temperature, andthe second power value is smaller than a third power value to be supplied to the light-emitting element by a circuit when a temperature is the second temperature, the circuit not being provided with the thermistor and supplying the first power value to the light-emitting element when a temperature is the first temperature.
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Accused Products
Abstract
A drive circuit is a drive circuit for turning on an LED and includes a self-excited inverter supplying power to the LED, wherein the self-excited inverter includes thermistors, and supplies, depending on temperature dependency of the thermistors, the first power value to the LED when a temperature is the first temperature, and the second power value to the LED when a temperature is the second temperature higher than the first temperature, and the second power value is smaller than the third power value that a circuit which is not provided with the thermistors and supplies the first power value to the LED when the temperature is a first temperature supplies to the LED when a temperature is the second temperature.
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Citations
7 Claims
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1. A drive circuit for turning on a light-emitting element, the drive circuit comprising
a self-excited inverter which supplies power to the light-emitting element, wherein the self-excited inverter includes a thermistor, and depending on temperature dependency of the thermistor, supplies a first power value to the light-emitting element when a temperature is a first temperature, and a second power value to the light-emitting element when a temperature is a second temperature higher than the first temperature, and the second power value is smaller than a third power value to be supplied to the light-emitting element by a circuit when a temperature is the second temperature, the circuit not being provided with the thermistor and supplying the first power value to the light-emitting element when a temperature is the first temperature.
Specification