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Patent Searching and Data


Title:
PROTECTION CIRCUIT FOR INVERSE CONNECTION OF POWER SUPPLY
Document Type and Number:
Japanese Patent JP2001314032
Kind Code:
A
Abstract:

To provide a simplified and low-cost protection circuit for inverse connection of a power supply, which does not lower the power supply voltage for the connection of power supply.

In an IC 11 of the SOI structure, a constant current circuit 21 and function circuits 22, 23 are connected between a current mirror circuit 19 and a negative power supply line 15. A resistor 24 and a diode 25 forming a protection circuit for inverse connection of power supply 26 are connected between a base line 20 and the negative power supply line 15. When the power supply is inversely connected to the IC 11, the diode 25 turns ON and the potential of the base line 20 is raised up to the voltage near the potential of the negative power supply line 15. An inverse voltage is blocked across the base and emitter of transistors 16 to 18 to protect a constant current circuit 21 and the function circuits 22, 23.


Inventors:
SOFUE SATOSHI
NAGATA JUNICHI
Application Number:
JP2000130310A
Publication Date:
November 09, 2001
Filing Date:
April 28, 2000
Export Citation:
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Assignee:
DENSO CORP
International Classes:
H02H11/00; H01L27/06; (IPC1-7): H02H11/00
Attorney, Agent or Firm:
Tsuyoshi Sato