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Title:
DRIVER CIRCUIT FOR ELECTROMAGNETIC INDUCTION COIL AND CHARGING DEVICE USING DRIVER CIRCUIT
Document Type and Number:
Japanese Patent JP2673876
Kind Code:
B2
Abstract:

PURPOSE: To enable charging by small heat generation and power loss by efficiently exciting an electromagnetic induction coil for electromagnetic induction coupling by high-frequency oscillation.
CONSTITUTION: A series circuit of an electromagnetic induction coil L1 for generating magnetic flux and a first capacitor C1 for stopping a DC is connected between the drain and gate of a field effect transistor Q1, a second capacitor C2 is connected between the gate and a source, a third capacitor C3 is connected between the drain and the source, and a self-excited oscillation circuit is composed of inductive element between the drain and the gate and capacitive element between the gate and the source and between the drain and the source. A resistor R3 is inserted between the node of the second and third capacitors C2, C3 and the source, and switching operation is conducted by the field effect transistor Q1.


Inventors:
Takahashi Minoru
Takashi Urano
Application Number:
JP32927194A
Publication Date:
November 05, 1997
Filing Date:
December 05, 1994
Export Citation:
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Assignee:
TDK Corporation
International Classes:
H02J7/10; H02J7/00; H02M3/28; H02M3/338; (IPC1-7): H02J7/10; H02J7/00; H02M3/28; H02M3/338
Domestic Patent References:
JP322832A
JP654454A
JP5234763A
Attorney, Agent or Firm:
Takashi Murai



 
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