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US 2010/0244715 A1Published application
Self-oscillating transformerless electronic ballast
OwnerSheng-Hann Leeinventor
Life of this patent
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Abstract
An electronic ballast includes a rectifier circuit having a first output terminal for coupling with a lamp; a first inductor coupled with a first node; a resonant network coupled with the first node; a first capacitor coupled with the first node; a first resistor coupled with a second node; a second resistor coupled with a second output terminal of the rectifier circuit; a power switch having an output end, a ground end and a control end, wherein the output end is coupled with the first node and the ground end is coupled with the second resistor; a voltage divider for driving the power switch; and a second inductor coupled between the second node and the control end of the power switch.
Claims32
An electronic ballast comprising:
- a rectifier circuit having a pair of input terminals for receiving an ac input voltage and a pair of output terminals for outputting a dc voltage, wherein a first output terminal of the rectifier circuit is for coupling with a second node of a lamp;
- a first inductor having a second end for coupling with a first node of the lamp;
- a second inductor having a first end coupled with a fifth node and a second end for coupling with a fourth node of the lamp;
- a first capacitor having a first end coupled with the fifth node and a second end for coupling with the second node;
- a second capacitor having a first end coupled with a sixth node;
- a first resistor having a first end coupled with the sixth node;
- a second resistor coupled with a second output terminal of the rectifier circuit;
- a third capacitor and a third resistor coupled in series between the sixth node and the second output terminal of the rectifier circuit;
- a power switch having an output end, a ground end and a control end, wherein the output end is coupled with the fifth node and the ground end is coupled with the second resistor;
- and
- a third inductor coupled between the sixth node and the control end of the power switch.
8 more elements
A lighting system comprises:
- an ac input source for generating an ac input voltage;
- a lamp comprising a first filament and a second filament, wherein the first filament is coupled between a first node and a second node and the second filament is coupled between a third node and a fourth node;
- and
- an electronic ballast coupled with the ac input source and the lamp for powering the lamp;
- the electronic ballast comprising:
- a rectifier circuit having a pair of input terminals for receiving the ac input voltage and a pair of output terminals for outputting a dc voltage, wherein a first output terminal of the rectifier circuit is coupled with the second node;
- an input capacitor coupled with the output terminals of the rectifier circuit;
- a first inductor coupled with a fifth node and the first filament of the lamp;
- a second inductor coupled with the fifth node and the second filament of the lamp;
- a first capacitor coupled with the fifth node and the first filament of the lamp;
- a second capacitor coupled with a sixth node and the second filament of the lamp;
- a first resistor coupled with the sixth node and the second filament of the lamp;
- a second resistor coupled with a second output terminal of the rectifier circuit;
- a third capacitor and a third resistor coupled in series between the sixth node and the second output terminal of the rectifier circuit;
- a power switch having an output end, a ground end and a control end, wherein the output end is coupled with the fifth node and the ground end is coupled with the second resistor;
- and
- a third inductor coupled between the sixth node and the control end of the power switch.
14 more elements
An electronic ballast comprising:
- a rectifier circuit for receiving an ac input voltage and having a first output terminal for coupling with a second node of a lamp;
- a first inductor having a first end coupled with a fifth node and a second end for coupling with a first node of the lamp;
- a first resonant network, coupled with the fifth node and a sixth node, for striking the lamp;
- a first capacitor having a first end coupled with the fifth node and a second end for coupling with the second node;
- a first resistor having a first end coupled with the sixth node and a second end for coupling with a third node of the lamp;
- a second resistor coupled with a second output terminal of the rectifier circuit;
- a power switch having an output end, a ground end and a control end, wherein the output end is coupled with the fifth node and the ground end is coupled with the second resistor;
- a voltage divider for driving the power switch;
- and
- a second inductor coupled between the sixth node and the control end of the power switch.
7 more elements
An electronic ballast comprising:
- a rectifier circuit for receiving an ac input voltage and having an output terminal for coupling with a lamp;
- a power switch, coupled with the rectifier circuit, for providing a sinusoidal driving signal to drive the lamp;
- a biasing circuit for biasing the power switch;
- a voltage divider for driving the power switch;
- and
- a power-regulating circuit, coupled with the power switch, for restricting a drive to the power switch.
3 more elements
Dependencies are inferred from the claim text.