Resonant converter and control method thereof
First Claim
1. A resonant converter for converting a direct current to an alternating current as an alternating current output at a semiconductor switching device driven by a driving section, supplying the alternating current output to a primary side of a transformer via resonance circuit, and converting an alternating current flowing through a secondary side of the transformer to a direct current, said converter comprising:
- means for making an output frequency of said driving section for driving said semiconductor switching device track a resonant frequency of said resonance circuit or a frequency corresponding to 1/(odd number) thereof.
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Accused Products
Abstract
A resonant converter which can realize its easy design, eliminate the need for its adjustment, realize reliable soft switching operation, and increase an efficiency. A driver DRV of a main switching device uses a PLL circuit PLL to apply frequency tracking control in such a manner that a driving frequency fsw is made to track a resonant frequency fr (or 1/N thereof, N being an odd number) and that the phase of the driving frequency fsw leads the current zero phase of the resonant frequency fr always by a desired time. As a result, such an optimum condition can be kept that the main switching device is triggered immediately before the zero-cross point of a resonant current. Thus the resonant converter which can always satisfy the optimum operational conditions, realize soft switching operation, and increase an efficiency can be realized with an easy design and a manufacturing adjustment-free arrangement.
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Citations
20 Claims
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1. A resonant converter for converting a direct current to an alternating current as an alternating current output at a semiconductor switching device driven by a driving section, supplying the alternating current output to a primary side of a transformer via resonance circuit, and converting an alternating current flowing through a secondary side of the transformer to a direct current, said converter comprising:
means for making an output frequency of said driving section for driving said semiconductor switching device track a resonant frequency of said resonance circuit or a frequency corresponding to 1/(odd number) thereof. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A resonant converter for converting a direct current to an alternating current as an alternating current output at a semiconductor switching device driven by a driving section, supplying the alternating current output to a primary side of a transformer via resonance circuit, and converting an alternating current flowing through a secondary side of the transformer to a direct current, said converter comprising:
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means for making an output frequency of said driving section for driving said semiconductor switching device track a resonant frequency of said resonance circuit or a frequency corresponding to 1/(odd number) thereof, and means for generating the output signal of said driving section with a phase leading a zero-cross point of the resonance current of said resonance circuit. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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19. A method of controlling a resonant converter for converting a direct current to an alternating current as an alternating current output at a semiconductor switching device driven by a driving section, supplying the alternating current output to a primary side of a transformer via resonance circuit, and converting an alternating current flowing through a secondary side of the transformer to a direct current, said method comprising the step of:
making an output frequency of said driving section for driving said semiconductor switching device track a resonant frequency of said resonance circuit or a frequency corresponding to 1/(odd number) thereof. - View Dependent Claims (20)
Specification