Title:
CONTACT POINT WELDING PROTECTIVE DEVICE OF HEATER CONTROL CIRCUIT
Document Type and Number:
Japanese Patent JPH08129945
Kind Code:
A
Abstract:
PURPOSE: To speedily and reliably stop current-carrying to a heating heater when a contact point of a relay is welded.
CONSTITUTION: When a contact point 2A is turned on when a driving signal is not sent out of a control device 18, a contact point welding detecting circuit 41 outputs a contact point welding signal. Therefore, a thyristor 4 is turned on, and an electric power supply circuit breaker 9 operates, and current-carrying to a heating heater 3 is speedily stopped. Since the contact point welding detecting circuit 41 is arranged separately from the control device 18, even if the control device 18 makes a malfunction, welding of the contact point 2A of a relay 2 can be reliably detected.
Inventors:
KOJIMA NOBUYUKI
KAMATA SUMIO
KAMATA SUMIO
Application Number:
JP26748394A
Publication Date:
May 21, 1996
Filing Date:
October 31, 1994
Export Citation:
Assignee:
TOSHIBA HOME TECH KK
International Classes:
H05B3/00; H01H47/00; H02H11/00; (IPC1-7): H01H47/00; H02H11/00; H05B3/00
Attorney, Agent or Firm:
Ushiki Mamoru (1 person outside)