Title:
OVERHEAT PROTECTION DEVICE
Document Type and Number:
WIPO Patent Application WO/2004/017507
Kind Code:
A1
Abstract:
An overheat protection device of a DC current device has a shot key barrier diode (17) as a temperature change detection element instead of a thermostat, thermistor, posistor, and the like. The shot key barrier diode (17) is placed in a position where a temperature change is to be detected. A reverse-direction voltage is applied to the shot key barrier diode (17). The shot key barrier diode (17) is connected to the gate of a thyristor (18). The thyristor (18) is connected in parallel to a control power source capacitor (C2) via a resistor (20). When the shot key barrier diode (17) is overheated, the reverse-direction current is increased and the thyristor (18) is triggered. When the thyristor (18) is electrically connected, the control power source is cut off. As a result, the turning on/off operation of a main switch (Q1) stops, thereby protecting the DC current device from overheat.
Inventors:
USUI HIROSHI (JP)
Application Number:
PCT/JP2003/010221
Publication Date:
February 26, 2004
Filing Date:
August 11, 2003
Export Citation:
Assignee:
SANKEN ELECTRIC CO LTD (JP)
USUI HIROSHI (JP)
USUI HIROSHI (JP)
International Classes:
H02M1/32; H02M3/335; (IPC1-7): H02M3/28
Foreign References:
| JP2001186760A | 2001-07-06 | |||
| JPH0540064A | 1993-02-19 | |||
| JPH06117942A | 1994-04-28 | |||
| JPH07297392A | 1995-11-10 | |||
| JPH0330782U | 1991-03-26 | |||
| JP2002209378A | 2002-07-26 | |||
| JP2002136123A | 2002-05-10 | |||
| JP2002153052A | 2002-05-24 | |||
| JPH08223023A | 1996-08-30 | |||
| JP2002101642A | 2002-04-05 | |||
| JPH07234162A | 1995-09-05 |
Attorney, Agent or Firm:
Takano, Noritsugu (5-8 Hyakunincho 2-chom, Shinjuku-ku Tokyo, JP)
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