Electromagnetic discharge appartus with dual power amplifiers
First Claim
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1. An electromagnetic discharge apparatus comprising:
- electrodeless discharge lamp including a discharge vessel having a first end and a second end and containing a fill material which supports electromagnetic discharge;
first power amplifier having an input and having an output electromagnetically coupled to said first end of said electrodeless discharge lamp;
second power amplifier having an input and having an output electromagnetically coupled to said second end of said electrodeless discharge lamp;
power divider having an input and having a first output coupled to said input of said first power amplifier and a second output coupled to said input of said second power amplifier; and
high frequency oscillator for providing a low power signal having an output coupled to said input of said power divider.
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Abstract
An electromagnetic discharge apparatus including a solid state supply or lamp ballast for energizing an electrodeless high intensity discharge (HID) lamp in a dual-ended fashion. A low power signal from a high frequency oscillator is split into two separate signals with definite phase relationship which are coupled to separate power amplifiers. In one embodiment, the signal from the high frequency oscillator is mixed with a signal from a modulation oscillator to AM, FM or pulse-width (PWM) modulate the power delivered to the lamp. This technique permits better control over the balance of power delivered to the ends of the lamp.
17 Citations
14 Claims
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1. An electromagnetic discharge apparatus comprising:
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electrodeless discharge lamp including a discharge vessel having a first end and a second end and containing a fill material which supports electromagnetic discharge; first power amplifier having an input and having an output electromagnetically coupled to said first end of said electrodeless discharge lamp; second power amplifier having an input and having an output electromagnetically coupled to said second end of said electrodeless discharge lamp; power divider having an input and having a first output coupled to said input of said first power amplifier and a second output coupled to said input of said second power amplifier; and high frequency oscillator for providing a low power signal having an output coupled to said input of said power divider. - View Dependent Claims (2, 3, 4)
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5. An electromagnetic discharge apparatus comprising:
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electrodeless discharge lamp including a discharge vessel having a first end and a second end and containing a fill material which supports electromagnetic discharge; first power amplifier having an input and having an output electromagnetically coupled to said first end of said electrodeless discharge lamp; second power amplifier having an input and having an output electromagnetically coupled to said second end of said electrodeless discharge lamp; power divider having an input and having a first output coupled to said input of said first power amplifier and a second output coupled to said input of said second power amplifier; mixer for modulating a carrier signal having an output coupled to said input of said power divider and having a first input and a second input; modulation oscillator for providing a modulation signal having an output coupled to said first input of said mixer; and high frequency oscillator for providing a low power carrier signal having an output coupled to said second input of said mixer. - View Dependent Claims (6, 7, 8, 9)
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10. An electromagnetic discharge apparatus comprising:
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electrodeless discharge lamp including a discharge vessel having a first end and a second end and containing a fill material which supports electromagnetic discharge; first power amplifier having an input and having an output electromagnetically coupled to said first end of said electrodeless discharge lamp; phase shifter having an input and having an output coupled to said input of said first power amplifier; second power amplifier having an input and having an output electromagnetically coupled to said second end of said electrodeless discharge lamp; power divider having an input and having a first output coupled to said input of said phase shifter and a second output coupled to said input of said second power amplifier; and high frequency oscillator for providing a low power signal having an output coupled to said input of said power divider. - View Dependent Claims (11, 12, 13, 14)
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Specification