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US 7,030,566 B2Granted
Circuit arrangement for generating an AC voltage from a DC voltage
AssigneePatent-Treuhand-Gesellschaft Fur Elektrisch Gluhlampen Mbh
InventorMarkus Heckmann
Life of this patent
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Abstract
The invention relates to a self-oscillating inverter circuit, preferably having bipolar transistors in a half-bridge circuit, having a transformer as the feedback means. In contrast to the prior art, the secondary windings of the transformer are not connected in parallel with the base-emitter path but in series with the collector-emitter path. As a result, no saturation transformers are required for feedback.
Claims7
A circuit arrangement for generating an AC voltage having the following features:
- a first and a second DC voltage input (J1, J2), for connection to a DC voltage source,
- at least one AC voltage output (K1),
- at least one load output (J3, J4), for connection to a load,
- at least one electronic switch (T1, T2) having two make contacts and a control contact, as a result of which a load resistor is defined between the make contacts, and a control resistor is defined between the control contact and a make contact,
- a make contact is coupled to a DC voltage input (J1, J2), and the other make contact is coupled to the AC voltage output (K1),
- a transformer having a primary (L11) and at least one secondary winding (L12, L13), a first terminal of the primary winding being coupled to the AC voltage output (K1), and a second terminal of the primary winding being coupled to the load output (J3), characterized in that the circuit arrangement has the following features:
- the secondary winding (L12, L13) and the load resistor form a series circuit which is connected between a DC voltage input (J1, J2) and the AC voltage output (K1),
- the control contact is connected such that the control resistor and the secondary winding (L12, L13) are in a mesh.
5 more elements
Dependencies are inferred from the claim text.