JPH02142360A - Protective device for inverter circuit - Google Patents

Protective device for inverter circuit

Info

Publication number
JPH02142360A
JPH02142360A JP63292896A JP29289688A JPH02142360A JP H02142360 A JPH02142360 A JP H02142360A JP 63292896 A JP63292896 A JP 63292896A JP 29289688 A JP29289688 A JP 29289688A JP H02142360 A JPH02142360 A JP H02142360A
Authority
JP
Japan
Prior art keywords
switching
transistor
turned
photocouplers
capacitor
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP63292896A
Other languages
Japanese (ja)
Inventor
Nobuo Otsuka
Tomohide Funakoshi
Koichi Matsumoto
Original Assignee
Sanyo Electric Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sanyo Electric Co Ltd filed Critical Sanyo Electric Co Ltd
Priority to JP63292896A priority Critical patent/JPH02142360A/en
Publication of JPH02142360A publication Critical patent/JPH02142360A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE: To prevent circulating current from flowing to switching elements by putting the switching elements into OFF states when ON/OFF signals to switching elements cannot be obtained for a definite time.
CONSTITUTION: The output from a PWM signal generation circuit 27 is transferred to photocouplers 20 to 25 through an inverter 26 and by turning On and OFF the switching elements in an operation section 19 PWM control is performed. A NOR theoretical value of two signals from terminals U and W among the outputs from a signal generation section is judged at a detection section 33 and is supplied to the base of a transistor 35 through a capacitor 34 and a resistor 356. When no output at the detection section 33 changes, the voltage at a point B is raised to cause the transistor 35 OFF, a capacitor 38 is discharged. As a result, a transistor 28 is turned OFF and all the photocouplers 20 to 25 are turned OFF. All the switching elements are thereby turned OFF.
COPYRIGHT: (C)1990,JPO&Japio
JP63292896A 1988-11-18 1988-11-18 Protective device for inverter circuit Pending JPH02142360A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP63292896A JPH02142360A (en) 1988-11-18 1988-11-18 Protective device for inverter circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP63292896A JPH02142360A (en) 1988-11-18 1988-11-18 Protective device for inverter circuit

Publications (1)

Publication Number Publication Date
JPH02142360A true JPH02142360A (en) 1990-05-31

Family

ID=17787789

Family Applications (1)

Application Number Title Priority Date Filing Date
JP63292896A Pending JPH02142360A (en) 1988-11-18 1988-11-18 Protective device for inverter circuit

Country Status (1)

Country Link
JP (1) JPH02142360A (en)

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