Title:
CURRENT LIMIT CIRCUIT FOR SWITCHING REGULATOR
Document Type and Number:
Japanese Patent JPS61277374
Kind Code:
A
Abstract:
PURPOSE:To prevent transformers from causing magnetic saturation, by reducing current flowing through a primary side transistor forcibly on reducing input voltage, and by increasing dead time. CONSTITUTION:Input terminals 1, 2 are provided in parallel with a stabilizing condenser 8, and the series unit of a transformer 3 and a switching element 4 is provided in parallel. The switching element 4 is driven and controlled by the output of an error amplifier 15 via a comparator 18, and the output of DC voltage rectified 9-10 and smoothed 11-12 through the secondary side of the transformer 3 is provided. Then, the current of the switching element 4 is detected by a current transformer 2, and the output is directed to a comparator 18 via a rectification circuit 22 and an error amplifier 23. When the voltage is higher than reference voltage 24, then it is detected by the error amplifier 23, and the conductive time of the switching element 4 is reduced so that the output pulse width of the comparator 18 may be reduced. When input voltage is lowered furthermore, then the reference voltage 24 via an auxiliary power source 25 is also lowered, and ON-time of Tr4 is reduced and dead time is increased.
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Inventors:
ADACHI HIDEMARO
Application Number:
JP12013285A
Publication Date:
December 08, 1986
Filing Date:
June 03, 1985
Export Citation:
Assignee:
MICRON KIKI KK
International Classes:
H02M3/28; H02M3/335; (IPC1-7): H02M3/335
Domestic Patent References:
| JPS5790385U | 1982-06-03 |
Attorney, Agent or Firm:
Kabayama Toru
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