Impedance matching circuit for current regulation of solid state lighting
AssigneeExclara Inc.
InventorsAnatoly Shteynberg, Harry Rodriguez, Dongsheng Zhou
Life of this patent
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Abstract
Exemplary embodiments provide an impedance matching circuit for providing variable power from a dimmer switch having a triac to a switching power supply couplable to solid-state lighting. An exemplary impedance matching circuit includes a first resistor coupled to receive a first current from the switching power supply; a second resistor; and a transistor coupled in series to the second resistor, with the transistor responsive to a gate voltage to modulate a second current through the second resistor in response to a detected level of the first current through the first resistor.
Claims21
An impedance matching circuit for providing variable power to an electronic load couplable to solid-state lighting, the circuit comprising:
- a first, current sense resistor coupled in series to the electronic load to receive a first current from the electronic load;
- a second resistor having a second current;
- and
- a switch coupled in series to the second resistor, the switch responsive to a control voltage to conduct the second current and to modulate the second current through the second resistor in response to a detected level of the first current through the first resistor.
An impedance matching circuit for providing variable power from a dimmer switch having a triac to a switching power supply couplable to solid-state lighting, the circuit comprising:
- a first, current sense resistor coupled in series to the switching power supply to receive a first current from the switching power supply;
- a second resistor having a second current;
- and
- a transistor coupled in series to the second resistor, the series-connected transistor and second resistor further couplable in parallel across the switching power supply, the transistor responsive to a gate voltage to conduct the second current and to modulate the second current through the second resistor in response to a detected level of the first current through the first resistor.
An impedance matching circuit for providing variable power from a dimmer switch having a triac to a switching power supply couplable to solid-state lighting, the circuit comprising:
- a first, current sense resistor coupled in series to the switching power supply to receive a first current from the switching power supply and to provide a first voltage level;
- a voltage limiter coupled in parallel to the first resistor to limit a magnitude of the first voltage level;
- a second resistor having a second current;
- and
- a depletion mode field effect transistor coupled in series to the second resistor, the series-connected transistor and second resistor further couplable in parallel across the switching power supply, the transistor to conduct the second current and to modulate the second current through the second resistor in response to the first voltage level.
Dependencies are inferred from the claim text.