Title:
OVERCURRENT PROTECTION CIRCUIT, AND SWITCHING CIRCUIT
Document Type and Number:
WIPO Patent Application WO/2022/050040
Kind Code:
A1
Abstract:
This overcurrent protection circuit is provided with: a first transistor having an emitter connected to a control voltage; and a second transistor having a base connected to a collector of the first transistor, a collector which is connected to a base of the first transistor and which is pulled up to a prescribed voltage, and a grounded emitter. When the control voltage exceeds a prescribed first threshold voltage, the first and second transistors are turned on, the control voltage decreases as a result of a decrease in the pull-up voltage, and a protection operation to turn a switching element off is started, and the overcurrent protection circuit is provided with a first diode connected between the control voltage and the emitter of the first transistor, and an element circuit connected between the emitter and the base of the first transistor. The element circuit comprises any of a second diode, a first resistor, and a parallel circuit including the second diode and the first resistor.
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Inventors:
IWAI SATOSHI (JP)
SUEKI MAMORU (JP)
SUEKI MAMORU (JP)
Application Number:
PCT/JP2021/030013
Publication Date:
March 10, 2022
Filing Date:
August 17, 2021
Export Citation:
Assignee:
OMRON TATEISI ELECTRONICS CO (JP)
International Classes:
H03K17/08; H02M1/00; H02M1/08; H03K17/082
Foreign References:
| JP2020127267A | 2020-08-20 | |||
| US20020122280A1 | 2002-09-05 | |||
| JPH11312789A | 1999-11-09 | |||
| US5675469A | 1997-10-07 | |||
| US20130279053A1 | 2013-10-24 | |||
| JP2006014402A | 2006-01-12 |
Attorney, Agent or Firm:
YAMAO, Norihito et al. (JP)
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