High intensity discharge lamp ballast apparatus
First Claim
1. A high intensity discharge lamp ballast apparatus comprising:
- a DC-AC inverter including at least one switching element for converting a DC voltage to an AC voltage, and a transformer for boosting the AC voltage;
a first resonance circuit that is connected to an output side of said DC-AC inverter, and includes an inductance element and a first resonant capacitor; and
a second resonance circuit that is connected to said first resonance circuit, that includes a high intensity discharge lamp, an ignitor transformer for generating a voltage for starting said high intensity discharge lamp, and a second resonant capacitor, and that supplies said high intensity discharge lamp with an output voltage of said DC-AC inverter in conjunction with said first resonance circuit in accordance with individual discharge periods.
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Accused Products
Abstract
A compact, low cost high intensity discharge lamp ballast apparatus which can carry out normal ballasting without extinction at discharge start includes a DC-AC inverting booster circuit, a first resonance circuit, and a second resonance circuit. The DC-AC inverting booster circuit includes a DC-AC converter transformer for converting a DC voltage fed from a DC power supply to an AC voltage in response to switching on and off of FETs, boosting the voltage. The first resonance circuit includes a leakage inductance connected in series with the secondary winding of the DC-AC converter transformer, and a first resonant capacitor connected in parallel with the secondary winding. The second resonance circuit includes a metal halide lamp, an ignitor transformer for producing a voltage to start lighting of the metal halide lamp, and a second resonant capacitor.
40 Citations
7 Claims
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1. A high intensity discharge lamp ballast apparatus comprising:
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a DC-AC inverter including at least one switching element for converting a DC voltage to an AC voltage, and a transformer for boosting the AC voltage; a first resonance circuit that is connected to an output side of said DC-AC inverter, and includes an inductance element and a first resonant capacitor; and a second resonance circuit that is connected to said first resonance circuit, that includes a high intensity discharge lamp, an ignitor transformer for generating a voltage for starting said high intensity discharge lamp, and a second resonant capacitor, and that supplies said high intensity discharge lamp with an output voltage of said DC-AC inverter in conjunction with said first resonance circuit in accordance with individual discharge periods. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification