Title:
NON-CONTACT MEDIUM COMMUNICATION CIRCUIT PROVIDED WITH RESONANCE CIRCUIT
Document Type and Number:
Japanese Patent JPH04256226
Kind Code:
A
Abstract:
PURPOSE: To always set a resonance circuit in a resonance state and to transmit data at high speed for a long distance with high reliability by means of supplying small apparent power even with a low frequency.
CONSTITUTION: Switch elements SW1 and SW2 change over two coils L1 and L2 connected to a capacitor C. The timing of switching is that when an input current I for the coils becomes '0'. A zero crossing detection circuit 1 detects the timing of zero crossing. A switching circuit is provided so that a system is switched to the switch elements SW1 and SW2 based on transmission data at timing when the coil input current (i) is '0'.
Inventors:
WAKABAYASHI NAOYUKI
Application Number:
JP1775191A
Publication Date:
September 10, 1992
Filing Date:
February 08, 1991
Export Citation:
Assignee:
OMRON TATEISI ELECTRONICS CO
International Classes:
G06K7/10; H02J50/00; H02J50/12; G06K17/00; H02J50/40; H04B5/00; (IPC1-7): G06K17/00; H04B5/00
Attorney, Agent or Firm:
Hisao Komori