| 摘要 |
A ballast (10) for powering a discharge lamp (70) comprises a source of direct current (100), an inverter (600), and an output circuit (700). Output circuit (700) provides high voltage starting pulses for igniting the lamp, and may be implemented with either a single-tapped inductor (720) or with dual tapped inductors (720,740). Preferably, inverter (600) may be realized as either a half-bridge inverter (600) or a full-bridge inverter (600') that operates at a relatively low frequency so as to avoid acoustic resonance effects in the lamp. DC current source (100) provides a limited source of current and may be realized as either a dual current source (100) for powering a half-bridge inverter (600), or a single current source (100') for powering a full-bridge inverter (600').
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