Electronic ballast having improved power factor and total harmonic distortion
First Claim
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1. An electronic ballast comprising:
- an EMI filter for protecting the AC line from EMI generated by the ballast;
a bridge rectifier for rectifying the ballast input AC current;
a DC bus without a traditional electrolytic capacitor having positive and negative rails coupled correspondingly to positive and negative rectifier bridge terminals;
a Passive Valley Fill Circuit coupled to the DC bus for smoothing the DC bus voltage, said circuit comprising four series charged and parallel discharged capacitors and nine diodes;
a high frequency DC/AC inverter coupled to the DC bus for powering a gas discharge lamp with high frequency AC current;
a bypass capacitor coupled to the DC input of the inverter;
first, second, third, and fourth capacitors each having positive and negative terminals;
first, second and third charge diodes;
fourth, fifth, sixth, seventh, eighth and ninth discharge diodes;
the positive terminal of the first capacitor positive connected to the DC bus positive rail and its negative terminal connected to the anode of the first diode;
the positive terminal of the second capacitor connected to the cathode of the first diode and the negative terminal of the second capacitor connected to the anode of the second diode;
the positive terminal of the third capacitor connected to the cathode of the second diode and the negative terminal of the third capacitor connected to the anode of the third diode;
the positive terminal of the fourth capacitor connected to the cathode of the third diode and the negative terminal of the fourth capacitor connected to DC bus negative rail;
the cathode of the forth diode connected to the negative terminal of the first capacitor and the anode of the fourth diode connected to the negative rail of the DC bus;
the cathode of the fifth diode connected to positive rail of the DC bus and the anode of the fourth diode connected to the positive terminal of the second capacitor;
the cathode of the sixth diode connected to the negative terminal of the second capacitor and the anode of the sixth diode connected to negative rail of the DC bus;
the anode of the seventh diode connected to the positive terminal of the third capacitor and the cathode of the seventh diode connected to positive rail of the DC bus;
the anode of the eighth diode connected to the positive terminal of the fourth capacitor and the cathode of the eighth diode connected to positive rail of the DC bus; and
the anode of the ninth diode connected to the negative rail of the DC bus and the cathode of the ninth diode connected to the negative terminal of the third capacitor.
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Abstract
An electronic ballast for driving a gas discharge lamp includes an EMI filter, a bridge rectifier coupled to a DC bus without a conventional electrolytic capacitor, a passive valley fill circuit built as a network having 4 charge/discharge energy storage capacitors and 9 diodes (4C9C), and a resonant DC to AC high frequency inverter for powering gas discharge lamp. The 4C9D circuit divides the rectified peak voltage by four and the low output voltage of the circuit is used to provide continuous lamp operation. The result is a ballast having substantially improved power factor, total harmonic distortion, and current crest factor. The electronic ballast is provided with a dimming capability from a TRIAC based wall dimmer.
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Citations
2 Claims
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1. An electronic ballast comprising:
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an EMI filter for protecting the AC line from EMI generated by the ballast; a bridge rectifier for rectifying the ballast input AC current; a DC bus without a traditional electrolytic capacitor having positive and negative rails coupled correspondingly to positive and negative rectifier bridge terminals; a Passive Valley Fill Circuit coupled to the DC bus for smoothing the DC bus voltage, said circuit comprising four series charged and parallel discharged capacitors and nine diodes; a high frequency DC/AC inverter coupled to the DC bus for powering a gas discharge lamp with high frequency AC current; a bypass capacitor coupled to the DC input of the inverter; first, second, third, and fourth capacitors each having positive and negative terminals; first, second and third charge diodes; fourth, fifth, sixth, seventh, eighth and ninth discharge diodes; the positive terminal of the first capacitor positive connected to the DC bus positive rail and its negative terminal connected to the anode of the first diode; the positive terminal of the second capacitor connected to the cathode of the first diode and the negative terminal of the second capacitor connected to the anode of the second diode; the positive terminal of the third capacitor connected to the cathode of the second diode and the negative terminal of the third capacitor connected to the anode of the third diode; the positive terminal of the fourth capacitor connected to the cathode of the third diode and the negative terminal of the fourth capacitor connected to DC bus negative rail; the cathode of the forth diode connected to the negative terminal of the first capacitor and the anode of the fourth diode connected to the negative rail of the DC bus; the cathode of the fifth diode connected to positive rail of the DC bus and the anode of the fourth diode connected to the positive terminal of the second capacitor; the cathode of the sixth diode connected to the negative terminal of the second capacitor and the anode of the sixth diode connected to negative rail of the DC bus; the anode of the seventh diode connected to the positive terminal of the third capacitor and the cathode of the seventh diode connected to positive rail of the DC bus; the anode of the eighth diode connected to the positive terminal of the fourth capacitor and the cathode of the eighth diode connected to positive rail of the DC bus; and the anode of the ninth diode connected to the negative rail of the DC bus and the cathode of the ninth diode connected to the negative terminal of the third capacitor.
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2. An electronic ballast comprising:
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a bridge rectifier for rectifying the ballast input AC current; an EMI filter for protecting the AC line from EMI generated in the ballast; a DC bus having positive and negative rails coupled correspondingly to the positive and negative output terminals of the bridge rectifier; a Passive Valley Fill Circuit coupled to the DC bus for smoothing the DC bus voltage comprising four series charged and parallel discharged capacitors and a diode network; a high frequency DC/AC inverter coupled to the DC bus, for powering a gas discharge lamp with a high frequency AC current; a bypass capacitor coupled to the DC input terminals of the inverter; a TRIAC-based dimmer coupled between the AC line and a ballast input terminal; first, second, third, and fourth capacitors each having positive and negative terminals; first, second and third charge diodes; fourth, fifth, sixth, seventh, eighth and ninth discharge diodes; the positive terminal of the first capacitor is connected to the positive rail of the DC bus and the negative terminal of the first capacitor connected to the anode of the first diode; the positive terminal of the second capacitor is connected to the cathode of the first diode and the negative terminal of the second capacitor connected to the anode of the second diode; the positive terminal of the third capacitor is connected to the cathode of the second diode and the negative terminal of the third capacitor is connected to the anode of the third diode; the positive terminal of the fourth capacitor is connected to the cathode of the third diode and the negative terminal of the fourth capacitor is connected to the negative rail of the DC bus; the cathode of the fourth diode is connected to the negative terminal of the first capacitor and the anode of the fourth diode is connected to negative rail of the DC bus; the cathode of the fifth diode is connected to the positive rail of the DC bus and the anode of the fifth diode is connected to the positive terminal of the second capacitor; the cathode of the sixth diode is connected to the negative terminal of the second capacitor and the anode of the sixth diode is connected to negative rail of the DC bus; the anode of the seventh diode is connected to the positive terminal of the third capacitor and the cathode of the seventh diode is connected to the positive rail of the DC bus; the anode of the eighth diode is connected to the positive terminal of the fourth capacitor and the cathode of the eighth diode is connected to the positive rail of the DC bus; and the anode of the ninth diode is connected to negative rail of the DC bus and the cathode of the ninth diode is connected to the negative terminal of the third capacitor.
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Specification
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Current AssigneeLucidity Lights, Inc.
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Original AssigneeLucidity Lights, Inc.
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InventorsAlexandrov, Felix I.
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Primary Examiner(s)A, Minh D
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Assistant Examiner(s)YANG, AMY X
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Application NumberUS13/837,034Publication NumberTime in Patent Office942 DaysField of Search315/291, 315/224, 315246-248, 315307-308, 315/200.RUS Class Current1/1CPC Class CodesH05B 41/2806 with semiconductor devices ...Y02B 20/00 Energy efficient lighting t...
