CONTROL CIRCUIT OF SWITCHING POWER SUPPLY

Japanese Patent JP2733004

B2

PURPOSE: To stabilize a control operation by preventing a thinning-out pulse from being continued when the output fluctuation value of a switching power supply is controlled to a target value by thinning out a pulse.
CONSTITUTION: A comparator 3 compares the output signal of an error amplifier 2 with a variable reference voltage generated by a reference-voltage adjusting circuit 7, it generates a signal for performing a thinning-out operation according to its voltage difference, and a thinning-out pulse generation circuit 4 generates a thinning-out pulse on the basis of the output signal of the comparator 3. A thinning-out pulse detection circuit 6 always monitors a driving pulse from the thinning-out generation circuit 4, and it detects that the thinning-out pulse or the driving pulse has been generated. When a thinning-out rate S is at 0 to 1/2, the reference voltage of the reference-voltage adjusting circuit 7 is changed to a direction in which a thinning-out operation is hard to perform so as to prevent the thinning-out operation from being continued whenever one thinning-out pulse is detected. A return-speed adjusting circuit 8 returns the reference voltage of the reference-voltage adjusting circuit 7 to an original voltage according to the output voltage of the error amplifier 2.

JP3817948	DISCHARGE LAMP LIGHTING DEVICE
JPH01291662	SWITCHING POWER SUPPLY
JP2000278944	SWITCHING POWER SUPPLY DEVICE

SUDO SUKEHISA
HASHIMOTO KIMIKATSU
SASAKI JUNICHI
IKEGAMI TSUNEO

JP14775693A

March 30, 1998

June 18, 1993

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HYOSHI DENKI SEISAKUSHO KK
MAIKURON KK
TOHOKU RIKOO KK
IKEGAMI TSUNEO

H02M3/28; G05F1/46; H02M3/335; (IPC1-7): H02M3/28

JP458760A
JP56168240A
JP1318547A

Kenjiro Take

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