| 摘要 |
FIELD: electricity.SUBSTANCE: invention relates to lighting engineering. The device comprises a current controller configured to receive dimming input signal, which is a variable showing the percentage of maximum excitation current supplied to LED load and to output a signal with pulse-width modulation (PWM signal) and reference voltage, a current transducer configured to receive voltage supply and to ensure output current and a shunt switch connected to the current controller and current transducer and between the current controller and LED load. The shunt switch is configured to divert at least part of the output current from the current transducer and from delivery to the LED load when the shunt switch is conducting, at that the shunt switch is not conducting when the dimming input signal shows that the percentage exceeds the threshold level.EFFECT: improving efficiency of LED current control based on dimming input signal.14 cl, 3 dwg |
