US Patent No. 11,032,896

CONTROL APPARATUS FOR LIGHT EMITTING DIODES


Patent No. 11,032,896
Issue Date June 08, 2021
Title Control Apparatus For Light Emitting Diodes
Inventorship Chen-Chi Lin, New Taipei (TW)
Assignee CHICONY POWER TECHNOLOGY CO., LTD., New Taipei (TW)

Claim of US Patent No. 11,032,896

1. A control apparatus for light emitting diodes (LEDs), comprising:an LED unit;
a voltage conversion unit electrically connected to the LED unit to convert an input voltage to supply the LED unit;
a voltage difference detecting unit electrically connected to the LED unit for detecting an output voltage of the LED unit, the voltage difference detecting unit comprising:
a first resistor electrically connected to a positive terminal of the LED unit;
a second resistor;
a transistor electrically connected to the first resistor, the second resistor, and a negative terminal of the LED unit respectively;
a control unit electrically connected to the voltage difference detecting unit, the control unit cooperating with the voltage difference detecting unit to provide a predetermined voltage;
a hysteresis driving unit electrically connected to the control unit; and
a switching unit electrically connected to the hysteresis driving unit and the voltage conversion unit, wherein
when the output voltage is greater than or equal to the predetermined voltage, the control unit notifies the hysteresis driving unit to control the switching unit to be open-circuited, so that the voltage conversion unit continuously converts the input voltage; and when the output voltage is less than the predetermined voltage, the control unit notifies the hysteresis driving unit to control the switching unit to be short-circuited, so that the voltage conversion unit stops converting the input voltage.