# US 2014/0191672 A1 · Load adapter with total harmonic distortion reduction > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2014/0191672 A1 - Document ID: US20140191672A1 - Status: Published application - Kind: A1 - Application number: 13/736,065 - Filed: 2013-01-07 - Published: 2014-07-10 - Earliest claimed: 2013-01-07 - Assignees: Q Technology, Inc. - Applicants: Q Technology, Inc. - Inventors: Thomas STACK - Web page: https://patentgrep.com/patent/US20140191672A1 ## CPC - H05B 45/36: Circuits for reducing or suppressing harmonics, ripples or electromagnetic interferences [EMI] - H05B 47/24: Circuit arrangements for protecting against overvoltage - Y02B 20/30: Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED] - H05B: ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL - Y02B: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS ## Abstract A low THD load adapter system is disclosed. The load adapter 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. ## Claims ### Claim 1 A load adapter system to connect to an electrical power source providing alternating current (AC) electrical power, the electrical power having power cycles, the load adapter 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. ### Claim 2 (depends on 1) The load adapter system recited in claim 1 wherein a portion of the first conduction period overlaps a portion of the second conduction period. ### Claim 3 (depends on 1) The load adapter system recited in claim 1 wherein said first lighting module, when connected to the electrical power source, conducts during a third conduction period within each power cycle; and wherein said second lighting module, when connected to the electrical power source, conducts during a fourth conduction period within each power cycle. ### Claim 4 (depends on 3) The load adapter system recited in claim 3 wherein a portion of the third conduction period overlaps a portion of the fourth conduction period. ### Claim 5 (depends on 1) The load adapter system recited in claim 1 wherein said first lighting module includes a plurality of LED pairs wherein each LED pair includes a first LED connected in forward direction and a second LED connected in reverse direction. ### Claim 6 (depends on 1) The load adapter system recited in claim 1 wherein said first lighting module includes two sets of LEDs wherein a first set of LEDs including a plurality of LEDs serially connected in forward direction and a second set of LEDs including a plurality of LEDs serially connected in reverse direction. ### Claim 7 (depends on 1) The load adapter system recited in claim 1 wherein said first lighting module includes a first predetermined number of LEDs and said second lighting module includes a second predetermined number of LEDs wherein the first predetermined number is less than the second predetermined number. ### Claim 8 A load adapter 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. ### Claim 9 (depends on 8) The load adapter system recited in claim 8 wherein a first capacitor is connected in series with said first lighting module. ### Claim 10 (depends on 8) The load adapter system recited in claim 8 wherein a second capacitor is connected in series with said first lighting module and also with said second lighting module. ### Claim 11 (depends on 8) The load adapter system recited in claim 8 wherein a third capacitor is connected parallel to said first lighting module. ### Claim 12 (depends on 9) The load adapter system recited in claim 9 wherein a fourth capacitor is connected parallel to said second lighting module. ### Claim 13 (depends on 8) The load adapter system recited in claim 8 wherein a portion of the first conduction period overlaps a portion of the second conduction period. ### Claim 14 (depends on 13) The load adapter system recited in claim 13 wherein said first lighting module, when connected to the electrical power source, conducts during a third conduction period within each power cycle; and wherein said second lighting module, when connected to the electrical power source, conducts during a fourth conduction period within each power cycle. ### Claim 15 (depends on 14) The load adapter system recited in claim 14 wherein a portion of the third conduction period overlaps a portion of the fourth conduction period. ### Claim 16 (depends on 8) The load adapter system recited in claim 8 wherein said first lighting module includes a first predetermined number of LEDs and said second lighting module includes a second predetermined number of LEDs wherein the first predetermined number is less than the second predetermined number. ### Claim 17 A load adapter 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. ### Claim 18 A load adapter 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.