Ballast power supply
First Claim
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1. A ballast power supply for a high intensity discharge lamp, said ballast power supply comprising:
- a variable frequency voltage generating circuit for producing a regulated cyclical voltage wherein, after ignition of the lamp, said variable frequency voltage generating circuit operates to vary the frequency of the cyclical voltage over a range of frequencies with a maximum frequency of less than or equal to about 375 kHz, and a resonant circuit coupled to the variable frequency voltage generating circuit.
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Abstract
A high frequency ballast power supply for a high intensity discharge lamp includes a variable frequency voltage generating circuit for producing a regulated cyclical voltage. After ignition of the lamp, the variable frequency voltage generating circuit operates to vary the frequency of the cyclical voltage over the range of frequencies with a maximum frequency of less than or equal to about 375 kHz. A resonant circuit for regulating the power supplied to the lamp is interposed between the variable frequency voltage generating circuit and the lamp.
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Citations
35 Claims
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1. A ballast power supply for a high intensity discharge lamp, said ballast power supply comprising:
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a variable frequency voltage generating circuit for producing a regulated cyclical voltage wherein, after ignition of the lamp, said variable frequency voltage generating circuit operates to vary the frequency of the cyclical voltage over a range of frequencies with a maximum frequency of less than or equal to about 375 kHz, and a resonant circuit coupled to the variable frequency voltage generating circuit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A ballast power supply for a high intensity discharge lamp, said ballast power supply comprising:
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a variable frequency voltage generating circuit for producing a regulated cyclical voltage wherein, after ignition of the lamp, said variable frequency voltage generating circuit operates to vary the frequency of the cyclical voltage over a range of frequencies with a maximum frequency of less than or equal to about 375 kHz; and
a resonant circuit interposed between said variable frequency voltage generating circuit and the lamp, said resonant circuit having a reactance such that power delivered to the lamp is regulated by the frequency of the variable frequency voltage generating circuit. - View Dependent Claims (16, 17, 18, 19)
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20. A ballast power supply for a high intensity discharge lamp, said ballast power supply comprising:
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a voltage generating circuit for producing a regulated DC voltage, a resonant inverter for converting said DC voltage to a cyclical voltage at a frequency within a range of frequencies with a maximum frequency of about 375 kHz in post-ignition operation;
a resonant inverter control for controlling said resonant inverter to vary the frequency of said cyclical voltage over said range of frequencies; and
a resonant circuit interposed between said resonant inverter and the lamp, said resonant circuit having a reactance such that power to the lamp varies with the frequency of said resonant inverter. - View Dependent Claims (21, 22, 23, 24, 25, 26, 27, 28)
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29. A lighting system comprising:
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a high intensity discharge lamp; and
a ballast power supply including;
a variable frequency voltage generating circuit for producing a regulated cyclical voltage wherein, after ignition of the lamp, said variable frequency voltage generating circuit operates to vary the frequency of the cyclical voltage over a range of frequencies with a maximum frequency of less than or equal to about 375 kHz, and a resonant circuit coupled to said variable frequency voltage generating circuit for regulating power supplied to the lamp. - View Dependent Claims (30, 31, 32, 33, 34, 35)
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Specification