LED driver

• Main Authors: YU MINGFENG, XIONG DAIFU, YE XIN, LIU YONGQIANG
• Format: Patent
• Language: English
• Published: 10.06.2015
• Subjects: ELECTRIC HEATING; ELECTRIC LIGHTING NOT OTHERWISE PROVIDED FOR; ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR; ELECTRICITY

The utility model provides an LED driver. An LED load is driven by a main circuit. Environment temperature of the LED driver is detected by a temperature sensing circuit, the temperature sensing circuit outputs a first signal representing the environment temperature to a control circuit, and the control circuit controls a control signal to be output in a time signal according to a preset rule on the basis of a preset corresponding relation. Finally, a current setting circuit controls output current of the main circuit to gradually rise to a maximum current value from a preset current value according to changes of the control signal. According to the process, a starting time of the LED driver is increased, and in the initial stage of the starting time, low capacity characteristics of an electrolytic capacitor under low temperature can be correspondingly matched through a relatively low output power; and through a relatively long starting time, the environment temperature can be increased due to heat generated by the LED driver, the electrolytic capacitor can be gradually broken away from the low temperature environment, and therefore the LED driver can normally start under a severe cold condition.