Dimmer control circuit, method and system
AssigneeDelta Electronics, Inc.
InventorsXiaoping FU, Yugang BAO, Linwei CHEN, Xinghua ZHANG
Life of this patent
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Abstract
A dimmer control circuit for controlling a phase cut dimmer includes: a rectifier circuitry, configured to rectify the output voltage of the phase cut dimmer to output a rectified voltage; an input voltage detecting circuitry, configured to output a detected voltage according to the rectified voltage; a processor, configured to output a control signal when the detected voltage meets a preset condition; and a constant current circuitry, configured to output or stop outputting a preset current to the rectifier circuitry in response to the control signal; wherein the preset current has a value greater than a holding current of the phase cut dimmer.
Claims18
A dimmer control circuit for controlling a phase cut dimmer, comprising:
- a rectifier circuitry, coupled to an output terminal of the phase cut dimmer and configured to rectify the output voltage of the phase cut dimmer to output a rectified voltage,
- an input voltage detecting circuitry, provided with an input terminal coupled to the rectifier circuitry, and configured to output a detected voltage according to the rectified voltage;
- a processor, provided with an input terminal coupled to an output terminal of the input voltage detecting circuitry, and configured to output a control signal when the detected voltage meets a preset condition;
- and
- a constant current circuitry, provided with a control terminal coupled to an output terminal of the processor and an output terminal coupled to the rectifier circuitry, and configured to output or stop outputting a preset current to the rectifier circuitry in response to the control signal;
- wherein the preset current has a value greater than a holding current of the phase cut dimmer.
A current control method of a phase cut dimmer, comprising:
- detecting an output voltage of the phase cut dimmer according to a preset period;
- providing compensation current to the phase cut dimmer when the output voltage of the phase cut dimmer meets a preset condition, the compensation current compensating a holding current of the phase cut dimmer;
- and
- stopping the providing of the compensation current when the output voltage of the phase cut dimmer does not meet the preset condition.
A current control system, comprising:
- an AC power, provided with a first output terminal and a second output terminal;
- a phase cut dimmer, provided with one terminal coupled to a first output terminal of the AC power, and another terminal coupled to a voltage output node;
- a bridge rectifier diode, provided with a cathode coupled to the voltage output node, and an anode grounded;
- an illumination power circuit, provided with a first input terminal, a second input terminal, a first output terminal, and a second output terminal, wherein the first input terminal is coupled to the voltage output node;
- an illumination module, provided with at least one light source coupled to the first output terminal and the second output terminal of the illumination power circuit;
- and
- a dimmer control circuit, coupled between the voltage output node and the ground for providing compensation current to the phase cut dimmer when an output voltage of the phase cut dimmer meets a preset condition, and stopping the providing of the compensation current when the output voltage of the phase cut dimmer does not meet the preset condition.
Dependencies are inferred from the claim text.