Title:
POWER ELEMENT DRIVING CIRCUIT
Document Type and Number:
Japanese Patent JP3440636
Kind Code:
B2
Abstract:
PURPOSE: To prevent a driving circuit from being destructed even when a power element is destructed.
CONSTITUTION: A control power source 1 is connected through a resistor R2 and the collector/emitter of a PNP transistor TR4 to the gate of a MOSFET Q1 to be the power element. To the resistor R2, the serial circuit of a diode D1 and a capacitor C1 is parallelly connected. When a part between the drain and the gate of the MOSFET Q1 is destructed and a high voltage is generated at the gate, an overcurrent is absorbed by the capacitor C1 and the transistor TR4 is turned OFF by the rise of the both-terminal voltage of the capacitor C1. Thus, the high voltage generated at the gate is prevented from being applied to the control power source 1.
Inventors:
Hero Nagahama
Application Number:
JP16128595A
Publication Date:
August 25, 2003
Filing Date:
June 27, 1995
Export Citation:
Assignee:
MATSUSHITA ELECTRIC WORKS,LTD.
International Classes:
H02H3/087; H02H3/093; H02H7/20; H03K17/08; (IPC1-7): H03K17/08; H02H3/087; H02H7/20
Domestic Patent References:
| JP8223784A |
Attorney, Agent or Firm:
Keisei Nishikawa (1 person outside)
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