Contributions to the design and control of LCsCp resonant inverters to drive high-power HPS lamps
Branas, C.; Azcondo, F.J.; Bracho, S.
Industrial Electronics, IEEE Transactions on
Volume 47, Issue 4, Aug 2000 Page(s):796 - 808
Digital Object Identifier 10.1109/41.857960
Summary:This paper presents the design criteria for full-bridge
series-parallel (LCsCp) resonant inverters
suitable for driving high-power high-intensity discharge lamps. By using
the properties derived from the transfer functions of the inverter, a
soft startup method is proposed. The lamp ignition is carried out
maintaining the voltage and current variables below prefixed peak
values, with the addition of no extra components to the power stage for
this purpose. In steady-state operation, the proposed control minimizes
the reactive voltamperes in the resonant tank. Moreover, the variation
of the power delivered to the lamp, caused by the lamp aging, is limited
in order to fulfil the standard. This design provides cost-effective
circuits, simplifying the DC-AC power stage of an electronic ballast.
The experimental results are given for high-pressure sodium lamps of the
Sylvania SHP250W type
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