Pulse width modulation amplifier circuit
First Claim
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1. In a balanced transformer-less pulse width modulation amplifier circuit of the type having a first and second filter where outputs are connected respectively across a common load, said first filter including a first filter coil and said second filter including a second filter coil, the improvement comprising:
- said first and second filter coils being wound at least partially on the same core and each having the same winding polarity with respect to the circuit outputs; and
first and second choke coils separately connected in series with said first and second filter coils, respectively, said first and second choke coils being small in inductance in comparison to said first and second filter coils.
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Abstract
A balanced transformer-less pulse width modulation amplifier circuit has two filter coils wound on the same core with the same polarity relative to the output. The arrangement reduces the possibility of magnetic saturation of the core and permits the cutoff frequency to be within the audio range.
29 Citations
3 Claims
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1. In a balanced transformer-less pulse width modulation amplifier circuit of the type having a first and second filter where outputs are connected respectively across a common load, said first filter including a first filter coil and said second filter including a second filter coil, the improvement comprising:
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said first and second filter coils being wound at least partially on the same core and each having the same winding polarity with respect to the circuit outputs; and first and second choke coils separately connected in series with said first and second filter coils, respectively, said first and second choke coils being small in inductance in comparison to said first and second filter coils. - View Dependent Claims (2, 3)
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Specification
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Current AssigneePioneer Electronics (USA) Incorporated (Pioneer Corporation)
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Original AssigneePioneer Electronics (USA) Incorporated (Pioneer Corporation)
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InventorsSato, Takeshi, Kato, Masayuki, Hasegawa, Tatsuzo, Tokumo, Akio
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Primary Examiner(s)Mullins, James B.
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Application NumberUS07/379,768Time in Patent Office480 DaysField of Search330/10, 330/207 A, 330/251, 363/41US Class Current330/10CPC Class CodesH03F 3/217 Class D power amplifiers; S...H03H 7/09 Filters comprising mutual i...
