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US 5,495,404 AGranted
Multi-resonant inverter
AssigneeMotorola, Inc.
InventorDennis L. Stephens
Life of this patent
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Abstract
A multi-resonant circuit has a series-resonant circuit coupled to the input of an inverter. The output of the inverter is coupled to a parallel resonant circuit. The output of the parallel resonant circuit energizes a load, which could be gas discharge lamps. The operating frequency of the inverter is between the resonant frequency of the series resonant circuit and the resonant frequency of the parallel resonant circuit.
Claims19
A multi-resonant circuit for energizing a load comprising:
- a DC voltage source;
- an inverter operating at an inverter frequency, the inverter having an inverter output;
- a parallel resonant circuit coupled between the inverter output and the load, the parallel resonant circuit having a first fundamental resonant frequency;
- an input inductor coupled between the DC voltage source and the inverter;
- a capacitor coupled to the input inductor such that a series resonant circuit is formed, the series resonant circuit having a second fundamental resonant frequency;
- and
- the first fundamental resonant frequency and the second fundamental resonant frequency selected such that losses of the multi-resonant circuit are minimized and the inverter frequency is between the first fundamental resonant frequency and the Second fundamental resonant frequency.
4 more elements
A circuit comprising:
- a DC voltage source;
- a half-bridge inverter operating at an inverter frequency, the half-bridge inverter having two transistors, each transistor being periodically turned off and on such that, during steady state operation, both transistors are not on at the same time, and the half-bridge inverter having an inverter output;
- a parallel resonant circuit coupled between the inverter output and a load, the parallel resonant circuit having a first fundamental resonant frequency;
- an input inductor coupled between the DC voltage source and the half-bridge inverter;
- a capacitor coupled to the input inductor such that a series resonant circuit is formed, the series resonant circuit having a second fundamental resonant frequency;
- and
- the first fundamental resonant frequency and the second fundamental resonant frequency selected such that losses of the circuit are minimized and the inverter frequency is between the first fundamental resonant frequency and the second fundamental resonant frequency.
4 more elements
Dependencies are inferred from the claim text.