Control circuit for lighting apparatus
AssigneeSilicon Works Co., Ltd.
InventorsGyeong Sik MUN, Geon Soo JANG
Life of this patent
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Abstract
Disclosed is a control circuit for a lighting apparatus using an LED as a light source. The control circuit controls a driving current of a driving circuit, using a monitoring result for a rectified voltage and a monitoring result for an output voltage of a specific LED group among a plurality of LED groups.
Claims12
A control circuit for a lighting apparatus which includes a plurality of LED groups connected in series to emit light using a rectified voltage, the control circuit comprising:
- a first monitoring unit configured to provide a monitoring result as a first control signal, the monitoring result being obtained by monitoring the rectified voltage;
- a second monitoring unit configured to provide a monitoring result as a second control signal, the monitoring result being obtained by monitoring an output voltage of a specific LED group among the LED groups;
- a driving circuit configured to provide a current path for light emission to one of the plurality of LED groups by comparing an internal reference voltage and a sensing voltage, receive a control signal obtained by adding up the first and second control signals, and control heat generated by the driving current by adjusting the amount of driving current in the current path in response to the control signal;
- and
- a sensing resistor connected to the current path and configured to provide the sensing voltage.
A control circuit for a lighting apparatus which includes a plurality of LED groups connected in series to emit light using a rectified voltage, the control circuit comprising:
- a monitoring unit configured to provide a monitoring result as a control signal, the monitoring result being obtained by monitoring an output voltage of a specific LED group among the LED groups;
- a driving circuit configured to provide a current path for light emission to one of the plurality of LED groups by comparing an internal reference voltage and a sensing voltage, and control heat generated by the driving current by adjusting the amount of driving current in the current path in response to the control signal;
- and
- a sensing resistor connected to the current path and configured to provide the sensing voltage.
Dependencies are inferred from the claim text.