Inverter driving scheme
First Claim
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1. An inverter for powering a load having a lamp, comprising:
- switching means responsive to driving signals for switching into conductive and nonconductive states whereby power is delivered to the load such that a voltage is applied to and current flows through the lamp; and
control circuitry for producing the driving signals based on a lamp power signal and including a multiplier for generating the lamp power signal which is proportional to the product of lamp current and lamp voltage.
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Abstract
An inverter for powering a lamp at deep dim levels. Inverter driving circuitry includes a feedback loop which compares desired dim level to signal representing actual lamp power consumption. Reproducibility of desired lighting conditions for different types of lamps powered by the same ballast over a wide range of temperatures is also provided.
40 Citations
15 Claims
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1. An inverter for powering a load having a lamp, comprising:
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switching means responsive to driving signals for switching into conductive and nonconductive states whereby power is delivered to the load such that a voltage is applied to and current flows through the lamp; and control circuitry for producing the driving signals based on a lamp power signal and including a multiplier for generating the lamp power signal which is proportional to the product of lamp current and lamp voltage. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method for controlling the power delivered by an inverter to a load having a lamp, comprising:
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switching a pair of transistors configured in a totem pole arrangement into conductive and nonconductive states in response to driving signals whereby power is delivered to the load such that a voltage is applied to and current flows through the lamp; and producing the driving signals based on a lamp power signal generated by a multiplier, the lamp power signal being proportional to the product of lamp current and lamp voltage. - View Dependent Claims (11, 12, 13, 14, 15)
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Specification