Abstract
In this paper, a low-cost low-frequency square-wave digital electronic ballast for high density discharge (HID) lamps. A highly efficient and reliable topology-dual buck half-bridge inverter (DBI) is adopted to supply the lamp with low-frequency square-wave positive and negative current avoiding acoustic resonances. The constant bus voltage is provided by the front end PFC stage and the buck converter is actually a quasi square wave converter in ZVS operation. The problem of excessive inductor current during low-frequency reversal transient is solved by single cycle control. Steady state power close-loop method realizes direct lamp power control without mass calculation of lamp current and voltage and consistency is good. The AVR special microcontroller for HID ballast is used to raise control performance and simplify the control circuit. The presented circuit was verified with experimental results. A prototype of 70W digital HID ballast has been built with the whole efficiency of 92%.
| Original language | English |
|---|---|
| Pages (from-to) | 83-88 |
| Number of pages | 6 |
| Journal | Diangong Jishu Xuebao/Transactions of China Electrotechnical Society |
| Volume | 22 |
| Issue number | SUPPL. 1 |
| State | Published - Dec 2007 |
Keywords
- Constant power control
- Electronic ballast
- Low-frequency square-wave
- Single cycle current control
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