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US 8,264,160 B2Granted
Advanced electronic ballasts
OwnerSheng-Hann Leeinventor
Life of this patent
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Abstract
An electronic ballast includes a rectifier circuit, having two output terminals coupled to a first node and a second node; a first capacitor having two ends coupled to the first node and the second node; an inverter, having a first terminal coupled to the first node, a second terminal coupled to the second node and a third terminal; an inductor, having a first end coupled to the third terminal of the inverter and a second end for coupling a first terminal of a lamp; a second capacitor, having two ends for coupling a second terminal and a third terminal of the lamp; a third capacitor, having two ends coupled to the first node and a third node, wherein the third node is further for coupling a fourth terminal of the lamp; and a diode, having two ends coupled to the third node and the second node.
Claims38
An electronic ballast, comprising:
- a rectifier circuit, having a pair of input terminals for receiving an ac (alternating current) input voltage and a pair of output terminals for outputting a dc (direct current) voltage, wherein a first output terminal of the rectifier circuit is coupled to a first node and a second output terminal of the rectifier circuit is coupled to a second node;
- a first capacitor, having two ends coupled to the first node and the second node, respectively;
- an inverter, having a first terminal, a second terminal and a third terminal, wherein the first terminal of the inverter is coupled to the first node, the second terminal of the inverter is coupled to the second node;
- an inductor, having a first end coupled to the third terminal of the inverter and a second end for coupling a first terminal of a lamp;
- a second capacitor, having two ends for coupling a second terminal and a third terminal of the lamp, respectively;
- a third capacitor, having a second end coupled to a third node, wherein the third node is further for coupling a fourth terminal of the lamp;
- and
- a diode, having a first end coupled to the third node;
- wherein when a voltage of the first node falls below a cross voltage of the third capacitor, the diode discharges the third capacitor.
6 more elements
An electronic ballast, comprising:
- a rectifier circuit, having a pair of input terminals for receiving an ac (alternating current) input voltage and a pair of output terminals for outputting a dc (direct current) voltage, wherein a first output terminal of the rectifier circuit is coupled to a first node and a second output terminal of the rectifier circuit is coupled to a second node;
- a first capacitor, having two ends coupled to the first node and the second node, respectively;
- an inverter, having a first terminal, a second terminal and a third terminal, wherein the first terminal of the inverter is coupled to the first node, the second terminal of the inverter is coupled to the second node;
- a first inductor, having a first end coupled to the third terminal of the inverter and a second end for coupling a first terminal of a lamp;
- a second capacitor, having two ends for coupling a second terminal and a third terminal of the lamp, respectively;
- a third capacitor, having a second end coupled to a third node;
- a first diode, having a first end coupled to the third node;
- a fourth capacitor, having a second end coupled to the fourth terminal of the lamp;
- and
- a second diode, having two ends coupled to the second end of the fourth capacitor and the third node, respectively.
7 more elements
An electronic ballast, comprising:
- a rectifier circuit, having a pair of input terminals for receiving an ac (alternating current) input voltage and a pair of output terminals for outputting a dc (direct current) voltage, wherein a first output terminal of the rectifier circuit is coupled to a first node and a second output terminal of the rectifier circuit is coupled to a second node;
- a first capacitor, having two ends coupled to the first node and the second node, respectively;
- an inverter, having a first terminal, a second terminal and a third terminal, wherein the first terminal of the inverter is coupled to the first node, the second terminal of the inverter is coupled to the second node;
- an inductor, having a first end coupled to the third terminal of the inverter and a second end for coupling a first terminal of a lamp;
- a second capacitor, having two ends for coupling a second terminal and a third terminal of the lamp, respectively;
- a third capacitor, having a second end coupled to a third node, wherein the third node is further for coupling a fourth terminal of the lamp;
- a fourth capacitor, having a second end coupled to a fourth node;
- a fifth capacitor, having a second end coupled to a fifth node;
- a first diode, having a second end coupled to the fourth node;
- a second diode, having two ends coupled to the fourth node and the fifth node, respectively;
- and
- a third diode, having a first end coupled to the fifth node.
9 more elements
Dependencies are inferred from the claim text.