JPS5583468A - Detection circuit of dc input current of invertor - Google Patents
Detection circuit of dc input current of invertorInfo
- Publication number
- JPS5583468A JPS5583468A JP15574678A JP15574678A JPS5583468A JP S5583468 A JPS5583468 A JP S5583468A JP 15574678 A JP15574678 A JP 15574678A JP 15574678 A JP15574678 A JP 15574678A JP S5583468 A JPS5583468 A JP S5583468A
- Authority
- JP
- Japan
- Prior art keywords
- given
- invertor
- current
- rectifier
- detection circuit
- 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.)
- Granted
Links
Landscapes
- Control Of Ac Motors In General (AREA)
- Inverter Devices (AREA)
Abstract
PURPOSE: To simplify the constitution and to improve reliability by synthesizing the instantaneous values of detection output of an AC input current detection circuit and a current detection circuit of capacitor.
CONSTITUTION: Three-phase AC input is given to the input terminal of a rectifier circuit 10 and further to an invertor 18 via the rectifier circuit 10 and a smoothing circuit 16, then an output frequency and output voltage adjusted to having desired values are given to an electric motor 20. The AC input current of the rectifier 10 is detected by current transformers 22a and 22b and given to one of the input terminal a of a summing amplifier 34 after it has been rectified by a rectifier 24. The charge and discharge current of a capacitor 14 for smoothing voltage is detected by a transformer 30 and given to the other input terminal b of the summing amplifier 34. A semiconductor element which constitutes the invertor 18 can be protected from being charged with excess current by watching the output of the summing amplifier 34.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP53155746A JPS5927186B2 (en) | 1978-12-19 | 1978-12-19 | Inverter DC input current detection circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP53155746A JPS5927186B2 (en) | 1978-12-19 | 1978-12-19 | Inverter DC input current detection circuit |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5583468A true JPS5583468A (en) | 1980-06-23 |
JPS5927186B2 JPS5927186B2 (en) | 1984-07-04 |
Family
ID=15612514
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP53155746A Expired JPS5927186B2 (en) | 1978-12-19 | 1978-12-19 | Inverter DC input current detection circuit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5927186B2 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS59213280A (en) * | 1983-05-17 | 1984-12-03 | Sanyo Electric Co Ltd | Protecting device of inverter circuit |
US5262350A (en) * | 1980-06-30 | 1993-11-16 | Semiconductor Energy Laboratory Co., Ltd. | Forming a non single crystal semiconductor layer by using an electric current |
-
1978
- 1978-12-19 JP JP53155746A patent/JPS5927186B2/en not_active Expired
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5262350A (en) * | 1980-06-30 | 1993-11-16 | Semiconductor Energy Laboratory Co., Ltd. | Forming a non single crystal semiconductor layer by using an electric current |
JPS59213280A (en) * | 1983-05-17 | 1984-12-03 | Sanyo Electric Co Ltd | Protecting device of inverter circuit |
Also Published As
Publication number | Publication date |
---|---|
JPS5927186B2 (en) | 1984-07-04 |
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