Lighting source with low total harmonic distortion
AssigneeQ Technology, Inc.
InventorThomas Stack
Life of this patent
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Abstract
A low THD lighting system is disclosed. The lighting system includes a first lighting module and a second lighting module connected parallel to the first lighting module. During each AC cycle the first lighting module conducts current for a first portion of the cycle and the second lighting module conducts current for a second portion of the cycle. When combined, the total current drawn from the power source substantially tracks the shape of the applied AC voltage. Accordingly, there is minimal distortion, and low total harmonic distortion level is achieved.
Claims19
A lighting system adapted to connect to an electrical power source providing alternating current (AC) electrical power, the electrical power having power cycles, the lighting system comprising:
- a first lighting module including at least one light emitting element;
- a second lighting module including at least one light emitting element, said second lighting module connected in parallel to said first lighting module;
- a first capacitor connected in series with said first lighting module, said first capacitor connected in parallel to said second lighting module;
- a second capacitor connected in series with both said first lighting module and said second lighting module;
- and
- wherein, when electrical power is applied to the lighting system, said first lighting module conducts electrical current during a first conduction period within each power cycle and said second lighting module conducts electrical current during a second conduction period within each power cycle.
A lighting system adapted to connect to an electrical power source providing alternating current (AC) electrical power, the electrical power having power cycles, the lighting system comprising:
- a first lighting module including at least one light emitting element;
- a first rectifier connected to said first lighting module, said first rectifier connected to provide a first rectified signal to said first lighting module;
- a second lighting module including at least one light emitting element;
- a second rectifier connected to said second lighting module, said second rectifier connected to provide a second rectified signal to said second lighting module;
- wherein said first rectifier and said first lighting module are connected in parallel to second rectifier and said second lighting module;
- wherein, when electrical power is applied to the lighting system, said first lighting module conducts electrical current during a first conduction period within each power cycle and said second lighting module conducts electrical current
- during a second conduction period within each power cycle.
A lighting system adapted to connect to an electrical power source providing alternating current (AC) electrical power, the electrical power having power cycles, the lighting system comprising:
- a first current path including at least one lighting emitting element;
- a second current path including at least one lighting emitting element, the second current path connected in parallel to said first current path;
- wherein said first current path is adapted to conduct electrical current during a first conduction period within each power cycle;
- and
- wherein said second current path is adapted to conduct electrical current during a second conduction period within each power cycle.
A lighting system adapted to connect to an electrical power source providing alternating current (AC) electrical power, the electrical power having power cycles, the lighting system comprising:
- a first lighting module including a plurality of light emitting diode (LEDs) pairs;
- a second lighting module including a plurality of light emitting diode (LEDs) pairs, said second lighting module connected in parallel to said each first lighting module;
- wherein said first lighting module, when connected to the electrical power source, conducts, thereby emits light, during a first conduction period within each power cycle;
- and
- wherein said second lighting module, when connected to the electrical power source, conducts, thereby emits light, during a second conduction period within each power cycle.
A method of generating light from an alternating current (AC) electrical power the electrical power having power cycles, the method comprising:
- providing an alternating current power source, the alternating current having a substantially sinusoidal flow characteristics and including continuous power cycles;
- generating light during a first conduction period during each power cycle using a first set of light emitting devices (LEDs) by conducting current during the first conduction period;
- generating light during a second conduction period during each power cycle using a second set of light emitting devices (LEDs) by conducting current during the second conduction period;
- and
- wherein the current conducted during the first conduction period and the second conduction period aggregate to a total conduction current flow that has substantially sinusoidal flow characteristics.
Dependencies are inferred from the claim text.