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| Fuel cell system |
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| Shaped channeled catalyst |
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| Method of conducting catalytically promoted gas-phase reactions |
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Switching power amplifier
| Details |
Inventors: Gulczynski, Zdzislaw;
Assignee:
Primary Examiner: Mullins; James B.
Assistant Examiner:
Attorney, Agent or Firm:
The invention generally relates to a switching power amplifier, particularly for high power, highly efficient audio amplification. The power amplifier operates at a high switching frequency and includes a generator. The generator is coupled to receive the line voltage for converting it into a high frequency generator signal and includes at least one capacitor for storing a DC voltage. A bidirectional switch is coupled in series with the output of the generator for selectively applying the generator signal to the load via a low-pass filter, for providing a correction of the output signal of the amplifier. The shape, magnitude and frequency of the generator signal are not essential. The switch is the only power component which must be responsive to the input and output signals of the amplifier, and the generator signal. Generally, it can be switched at any time as to allow the correction. The low-pass filter having an inductive input is employed. However, the switch is protected against voltage surges as an excessive voltage thereacross is transformed, rectified and applied to the capacitor of the generator. |
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DETAILED DESCRIPTION Accordingly, the present invention is intended to provide a switching power amplifier having a very low number of components, short response time, very high reliability and efficiency.
A switching power amplifier according to the present invention includes a generator means for providing a generator signal and including at least one capacitor for storing a DC supply voltage of the generator means, a low-pass filter having a substantially inductive input and including a first inductor, for providing the output signal, a switch means responsive to the input, generator and output signals for selectively applying the generator signal to the low-pass filter input for providing corrections of the output signal of the switching power amplifier, at least one second inductor magnetically coupled to the first inductor, and rectifier means coupled for rectifying voltages appearing across the second inductor for providing charging current to the capacitor of the generator means.
In another embodiment switching power amplifier includes a generator means for providing a generator signal and including at least one capacitor for storing a DC supply voltage of the generator means, a low-pass filter having a substantially inductive input, for providing the output signal, a switch means responsive to the input, generator and output signals for selectively applying the generator signal to the low-pass filter input for providing corrections of the output signal of the switching power amplifier, a transformer having a primary winding coupled to the low-pass filter input, and at least one secondary winding, and rectifier means coupled for rectifying voltages appearing across the secondary winding of the transformer for providing charging current to the capacitor of the generator means.
The present embodiments are thus operable with a single bidirectional switch responsive to the input, generator and output signals which is coupled between the output of the generator means and a low-pass filter having an inductive input
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