Title:
AMPLIFYING CIRCUIT, NOISE REDUCING DEVICE, AND POWER CONVERTER
Document Type and Number:
Japanese Patent JP3937869
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To miniaturize a zero-phase current transformer.
SOLUTION: A secondary winding of the zero-phase current transformer 21 is connected to emitters of transistors Q11, Q12 and to a base via diodes D3, D4, which are connected to the base of the transistors Q11, Q12 to cause a current to flow via resistors R1, R2. Forward voltages of the diodes D3, D4 are impressed between the base and the emitter of the transistor Q11, Q12. This makes the output voltage of the secondary winding of the current transformer 21 zero to cause a current to flow without inducing a voltage to the secondary winding. Thus, the number of turns of the primary and the secondary windings of the current transformer 21 can be decreased to reduce core area.
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Inventors:
Mamoru Tsuruya
Application Number:
JP2002049307A
Publication Date:
June 27, 2007
Filing Date:
February 26, 2002
Export Citation:
Assignee:
Sanken Electric Co., Ltd.
International Classes:
H02M3/28; H03F3/18; (IPC1-7): H02M3/28; H03F3/18
Domestic Patent References:
| JP9266677A | ||||
| JP3283805A | ||||
| JP5219758A | ||||
| JP49092136U |
Attorney, Agent or Firm:
Kimura Mitsuru
Takanori Mamoru
Takanori Mamoru