US Patent No. 11,071,179

DIMMABLE LED DRIVE CIRCUIT AND CONTROL METHOD THEREOF


Patent No. 11,071,179
Issue Date July 20, 2021
Title Dimmable Led Drive Circuit And Control Method Thereof
Inventorship Zaixin Mu, Beijing (CN)
Pan Zhang, Beijing (CN)
Assignee MAXIC TECHNOLOGY CORPORATION, Beijing (CN)

Claim of US Patent No. 11,071,179


1. A dimmable LED drive circuit, comprising:an LED circuit configured to emit light;
a thyristor dimmer configured to control a voltage waveform applied to the LED circuit, the voltage waveform including a chopping angle corresponding to an initial conduction of the thyristor dimmer;
a bleeder current circuit configured to provide a current path for the thyristor dimmer to maintain a conduction of the thyristor dimmer;
a thyristor chopping angle detection circuit configured to detect at least one parameter associated with the chopping angle of the voltage waveform applied to the LED circuit;
a bleeder current control circuit configured to control an operation of the bleeder current circuit based on an operation of the LED circuit and the at least one parameter associated with the chopping angle; and
an output current compensation circuit configured to reduce a current flowing through the LED circuit when a voltage corresponding to the chopping angle is close to a forward voltage of the LED circuit.