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Title:
Sign - Kosa in modulator
Document Type and Number:
Japanese Patent JP6164541
Kind Code:
B2
Abstract:
The invention relates to a self-oscillating pulse-width modulation amplifier in the form of a sine-cosine modulator (10) comprising at least two comparators (13, 14), two integrators (11, 12), a power switching stage (15), and negative feedback coupling with a low-frequency signal input and output. To achieve a maximum modulation factor, there are provisions with the aid of the comparators (13, 14) and integrators (11, 12) for the generation of sine- and cosine-square-wave voltages and sine- and co-sine-triangle-wave voltages that drive the power switching stage (15) in part, wherein the output of the power switching stage (15) combined with an LC low-pass filter (16) forms the low-frequency signal output. This brings about a situation in which a stable natural frequency exists and the modulation factor can be increased to nearly 100%. At the same time, a very low level of distortion is achieved and no distortion components higher than K3 arise, so there is a significant improvement vis-a-vis the known pulse-width modulation amplifiers.

Inventors:
Wemeier, Stephan
Application Number:
JP2015528881A
Publication Date:
July 19, 2017
Filing Date:
September 04, 2012
Export Citation:
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Assignee:
Conta Pro Nut Game Bha
International Classes:
H03F3/217; H03F1/32; H03K7/08
Domestic Patent References:
JP2005123949A
JP2001127562A
JP2003052170A
Foreign References:
US6107875
Attorney, Agent or Firm:
▲吉▼川 俊雄
Kana Ichikawa



 
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