Title:
DIRECT-CURRENT IMPRESSING CIRCUIT
Document Type and Number:
WIPO Patent Application WO/1995/011549
Kind Code:
A1
Abstract:
Both ends of the primary winding of a transformer (T3 or T4) or a choke coil (L2 or L3) are connected to a current mirror circuit or a constant-voltage circuit. The AC component bypasses a transistor (Q1 or Q2) constituting a current mirror circuit or a constant-voltage circuit through a bypass circuit comprising a capacitor (C2). The DC magnetization caused in the core or yoke of the transformer (T3) or the choke coil (L2) is canceled by DC currents made to flow through the primary winding of the transformer (T3) or choke coil (L2) in opposite directions. The DC magnetization caused in the core or yoke of the transformer (T4) or the choke coil (L3) is reduced to a very low extent when the DC currents made to flow through the primary winding of the transformer (T4) or the choke coil (L3) are suppressed. Therefore, the circuit including the transformer (T3) can be miniaturized, and the characteristics of the circuit can be improved, because a gap is not needed in the magnetic circuit of this circuit.
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| WO/1997/045947 | SWITCHED-MODE POWER SUPPLY ARRANGEMENT |
Inventors:
UMEDA KAZUHIRO (JP)
ICHIKAWA SYUZI (JP)
ICHIKAWA SYUZI (JP)
Application Number:
PCT/JP1994/001746
Publication Date:
April 27, 1995
Filing Date:
October 18, 1994
Export Citation:
Assignee:
TOKYO TSUKI CO LTD (JP)
UMEDA KAZUHIRO (JP)
ICHIKAWA SYUZI (JP)
UMEDA KAZUHIRO (JP)
ICHIKAWA SYUZI (JP)
International Classes:
G05F1/44; H01F27/42; H03H11/02; H04M19/00; H04M19/08; (IPC1-7): H03H11/02
Foreign References:
| JPH0284484U | 1990-06-29 | |||
| JPH0193245A | 1989-04-12 | |||
| JPH01270403A | 1989-10-27 | |||
| JPH0287753A | 1990-03-28 |
Other References:
See also references of EP 0676862A4
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