JPS5490527A - Protection system for transistor inverter circuit - Google Patents
Protection system for transistor inverter circuitInfo
- Publication number
- JPS5490527A JPS5490527A JP15729377A JP15729377A JPS5490527A JP S5490527 A JPS5490527 A JP S5490527A JP 15729377 A JP15729377 A JP 15729377A JP 15729377 A JP15729377 A JP 15729377A JP S5490527 A JPS5490527 A JP S5490527A
- Authority
- JP
- Japan
- Prior art keywords
- output
- coming
- transistor
- short
- inverter
- 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
Links
Landscapes
- Inverter Devices (AREA)
Abstract
PURPOSE: To orrectly operate a protection of the transistor element, by means of stopping a base signal to each transistor, with a short-circuit current detected at a low level against the short-circuit fault between both poles of DC terminals through two transistors.
CONSTITUTION: With a transistor Tr2 being short-circuited due to a certain reason, if given an ON-command through Tr1, Tr1B, terminal voltage VR1 of a resistor R1 is inputted to a photocoupler TLP1, with an output D1 of an inverter INV1 coming to be "1" similarly with an output D2 also coming to be "1". Accordingly, an output of NAND element comes to be "0", with an output D3 of an inverter INV3 coming to be "1". And an output IBS, by elements AND1 to AND4, makes the signal of bases Tr1B to Tr1 to Tr4 locked. And the output IBS, being "1", makes the Tr4 in conduction, with relays Ry1, Ry1 turned on. This causes a normally closed contact Ry2-5 turned on, with a coil CBC not conducted, and a power source P, N and the inverter circuit are isolated by a breaker CB.
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP15729377A JPS5490527A (en) | 1977-12-28 | 1977-12-28 | Protection system for transistor inverter circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP15729377A JPS5490527A (en) | 1977-12-28 | 1977-12-28 | Protection system for transistor inverter circuit |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5490527A true JPS5490527A (en) | 1979-07-18 |
Family
ID=15646483
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP15729377A Pending JPS5490527A (en) | 1977-12-28 | 1977-12-28 | Protection system for transistor inverter circuit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5490527A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS58224577A (en) * | 1982-06-21 | 1983-12-26 | Matsushita Electric Ind Co Ltd | Power converter |
JPS61161975A (en) * | 1985-01-11 | 1986-07-22 | Hitachi Ltd | Protecting device of ac elevator controller |
JPS61293180A (en) * | 1985-06-21 | 1986-12-23 | Fuji Electric Co Ltd | Protecting device for gto thyristor inverter |
-
1977
- 1977-12-28 JP JP15729377A patent/JPS5490527A/en active Pending
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS58224577A (en) * | 1982-06-21 | 1983-12-26 | Matsushita Electric Ind Co Ltd | Power converter |
JPH0219706B2 (en) * | 1982-06-21 | 1990-05-02 | Matsushita Denki Sangyo Kk | |
JPS61161975A (en) * | 1985-01-11 | 1986-07-22 | Hitachi Ltd | Protecting device of ac elevator controller |
JPS61293180A (en) * | 1985-06-21 | 1986-12-23 | Fuji Electric Co Ltd | Protecting device for gto thyristor inverter |
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