Electric power conversion systems – Current conversion – With means to introduce or eliminate frequency components
Patent
1986-11-12
1987-07-28
Beha, Jr., William M.
Electric power conversion systems
Current conversion
With means to introduce or eliminate frequency components
323207, 323222, 363 82, 363 89, 363126, H02M 7217, H02M 112
Patent
active
046835296
ABSTRACT:
An off-line switching power supply is described which controls the switching transistor of a fly-back circuit in such a fashion as to achieve better than 0.99 power factor control. The technique used for power factor control allows the switching power supply to operate either from AC or DC sources. The power supply operating from an AC source will accept all international voltages and line frequencies as input to produce a well-regulated DC output. The inductor of the fly-back circuit is maintained at the verge of continuous/discontinuous operation by the power factor control circuit to achieve a high efficiency operation and to minimize switching losses. The power factor correction circuit uses pulsewidth modulation and frequency modulation to control the switching transistor and maintain a high power factor under varying line and load conditions. The power supply also includes integral current limiting protection and RFI filtering for safe and quiet operation.
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Beha, Jr. William M.
Zytec Corporation
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