Power amplifier for use in an NMR tomography apparatus
First Claim
Patent Images
1. A power amplifier comprising:
- an amplifier assembly forming a voltage source;
a resonant assembly connected in parallel across said amplifier assembly, said resonant assembly comprising a resonant capacitor and a control element connected in series; and
said amplifier assembly being operable for generating an output voltage of said power amplifier in a non-resonant mode of said power amplifier, and said resonant assembly being operable for generating said output voltage of said power amplifier in a resonant mode of said power amplifier.
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Abstract
A power amplifier has an amplifier assembly and a resonant assembly with a resonant capacitor and a control element. A parallel resonant circuit can be formed by the resonant capacitor and a load that can be connected to the amplifier. An output voltage or an intermediate circuit voltage of the amplifier can be applied at the resonance capacitor via the control element. An NMR tomography apparatus has at least one such power amplifier. The power amplifier can be universally used with low components outlay and is able to generate a number of signal forms.
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Citations
19 Claims
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1. A power amplifier comprising:
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an amplifier assembly forming a voltage source; a resonant assembly connected in parallel across said amplifier assembly, said resonant assembly comprising a resonant capacitor and a control element connected in series; and said amplifier assembly being operable for generating an output voltage of said power amplifier in a non-resonant mode of said power amplifier, and said resonant assembly being operable for generating said output voltage of said power amplifier in a resonant mode of said power amplifier. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A power amplifier comprising:
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an intermediate circuit assembly which generates an intermediate circuit voltage; a resonant assembly comprising a resonant capacitor and a control element connected across said intermediate circuit voltage, said control element being operable to connect and disconnect said resonant capacitor across said intermediate circuit voltage; and a switched output stage connected across said resonant capacitor, said switched output stage comprising means, in a first mode, for producing a switched output stage voltage by pulse-width modulation of said intermediate circuit voltage, said switched output stage voltage being employed for generating an output voltage, and, in a second mode, for forming a parallel resonant circuit between said resonant capacitor and a load. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A power amplifier comprising:
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an amplifier assembly forming a voltage source; a resonant assembly connected in parallel across said amplifier assembly forming a voltage source, said resonant assembly comprising a resonant capacitor and a control element connected in series; said amplifier assembly and said resonant assembly, in combination, comprising means for generating an output voltage; and said control element being a control element selected from the group consisting of an IGBT connected in a shunt arm of a diode bridge, and two IGBTs connected in parallel with opposite polarity.
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Specification