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US 6,603,674 B2Granted
Electronic transformer with good immunity against high-voltage pulses
AssigneePatent-Treuhand-Gesellschaft fuer elektrische Gluehlampen mbH
InventorsFelix Franck, Helmut Haeusser-Boehm, Joachim Muehlschlegel
Life of this patent
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Abstract
Electronic transformers with a self-excited half bridge can be destroyed by high-voltage pulses from the mains supply lead. This can happen by the high-voltage pulse initiating a starting operation which leads to cross currents. This destruction mechanism is suppressed by specifically discharging a starting capacitor.
Claims11
An electronic transformer comprising:
- a self-excited half-bridge inverter with a first (S1) and a second (S2) half-bridge switch,
- a starter circuit (R1, C1, C2, D1,) for driving the second half-bridge switch in order to start up the half-bridge inverter, and
- a blocking device for discharging a starting capacitor (C1) to prevent initiation of a starting operation b the starter circuit during operation of the half-bridge inverter, said blocking device includes switching means for discharging said starting capacitor (C1) when said second half-bridge switch (S2) of the half-bridge inverter is not driven.
Dependencies are inferred from the claim text.