Electric power conversion systems – Current conversion – With means to introduce or eliminate frequency components
Patent
1995-03-17
1997-06-17
Wong, Peter S.
Electric power conversion systems
Current conversion
With means to introduce or eliminate frequency components
363 95, H02M 712
Patent
active
056403151
ABSTRACT:
A switching regulator including: a switching element connected to an input DC signal and operating for turning-on and -off the input DC signal to produce an AC signal such as a rectangular wave signal; a rectifier for rectifying the AC signal thereby generating an output voltage; a circuit for producing a frequency-variable triangular wave signal having a constant amplitude; a comparator for comparing the triangular wave signal with the output voltage of the rectifier thereby obtaining a pulse-width modulated signal used for controlling the operation of the switching element; a modulation signal generator for generating a modulation signal having an amplitude variable in asynchronism with the frequency of the triangular wave signal; a sampling and holding circuit for sampling the modulation signal at a timing in synchronism with the frequency of the triangular wave signal or preferably at the timing of a maximum or minimum value of the triangular wave signal and holding the sampled modulation signal; and a circuit for modulating the frequency of the triangular wave signal preferably within a range of about 0.8 to 1.2 times of a predetermined center frequency based on the voltage value of the modulation signal as sampled and held.
REFERENCES:
patent: 4387418 (1983-06-01), Koike
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patent: 5376872 (1994-12-01), Hara
The Practical Power Source Circuit Design Hand Book, J. Togawa, CQ, Publication, pp. 92-175.
The Practical Electronic Circuit Hand Book 4, CQ, Publication, pp. 254-259.
The Transistor Technology Special No. 28, CQ, Publication, pp. 54-143.
Hirano Hosei
Tanaka Tetsuro
Jardieu Derek J.
Nippon Steel Corporation
Wong Peter S.
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