Title:
INSULATED ANALOG TRANSMISSION CIRCUIT AND VOLTAGE DETECTING CIRCUIT USING THE SAME
Document Type and Number:
Japanese Patent JP3217978
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a photocoupler insulated analog transmission circuit that can easily correct the influence of transmission characteristic dispersion and secular change of a photocoupler while adopting analog transmission, and provide a voltage detecting circuit using this analog transmission circuit.
SOLUTION: An insulated analog transmission circuit 10 having a photocoupler FCO formed of an input a-b side light emitting element LEO and an output e-f side light receiving element PQO, and an operating power source Vcc of the light receiving element PQO. In this case, a reference voltage generating circuit selectively connected to the operating power supply Vcc to make it a power source is connected to the light emitting element LEO, and the reference voltage generating circuit is connected to the operating power source Vcc to put the photocoupler FCO in action so as to output voltage at the time of input of the reference voltage.
Inventors:
Shoichi Kuromori
Masaki Tatemori
Masaki Tatemori
Application Number:
JP26451896A
Publication Date:
October 15, 2001
Filing Date:
October 04, 1996
Export Citation:
Assignee:
Japan Radio Co., Ltd.
International Classes:
G01R15/22; G01R19/00; (IPC1-7): G01R19/00; G01R15/22
Attorney, Agent or Firm:
Yoshio Komiya