Lighting apparatus
AssigneeLeedarson Lightng Co., Ltd.
InventorsShuisheng Wen, Haiyan Chen, Zulong Liu, Bin Liu
Life of this patent
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Abstract
A lighting apparatus includes a surge voltage protector, a first rectifier, a first DC-DC converter, a first DC filter, a first constant current source, a second rectifier, a second DC-DC converter, a second DC filter, a second constant current source, a first PWM generator, a second PWM generator, a dimmer controller, a first light source and a second light source. The surge voltage protector is coupled to an external power for relaying an AC power. When there is a surge voltage is detected, the surge voltage protector disable routing the AC power. There are two or more paths of power circuits each generating a limited power. These power circuits are placed in the same container to simplify the overall design.
Claims20
A lighting apparatus, comprising:
- a surge voltage protector for coupled to an external power for relaying an AC power, wherein when there is a surge voltage is detected, the surge voltage protector disable routing the AC power;
- a first rectifier coupled to the surge voltage protector, wherein the first rectifier comprises a first bridge circuit to covert the AC power to a first DC power;
- a first DC-DC converter for converting the first DC power to a second DC power, the second DC power has a lower voltage than the first DC power;
- a first DC filter for filtering the second DC power to a third DC power, wherein the third DC power has a lower frequency than the second DC power;
- a first constant current source coupled to the first DC filter for receiving the third DC power as a first energy source;
- a second rectifier coupled to the same surge voltage protector, wherein the second rectifier comprises a second bridge circuit to convert the AC power to a fourth DC power;
- a second DC-DC converter for converting the fourth DC power to a fifth DC power, the fifth DC power has a lower voltage than the fourth DC power;
- a second DC filter for filtering the fifth DC power to a sixth DC power, wherein the sixth DC power has a lower frequency than the fifth DC power;
- a second constant current source coupled to the second DC filter for receiving the sixth DC power as a second energy source;
- a first PWM generator for generating a first PWM signal based on a dimmer control signal;
- a second PWM generator for generating a second PWM signal based on the dimmer control signal;
- a dimmer controller coupled to the first PWM generator and the second PWM generator for converting an operation to the dimmer control signal,
- a first light source coupled to the first constant current source to receive a first driving current from the first constant current source, wherein the first driving current is associated to the first PWM signal;
- and
- a second light source coupled to the second constant current source to receive a second driving current from the second constant current source, wherein the second driving current is associated to the second PWM signal.
Dependencies are inferred from the claim text.