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 Title: |
US4521840:
D-C Bus current monitoring system
[ Derwent Title ]
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| Country: |
US United States of America
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| Inventor: |
Hoadley, Frederick L.; Ithaca, NY
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| Assignee: |
Borg-Warner Corporation, Chicago, IL
other patents from BORG-WARNER CORPORATION (71655) (approx. 1,334)
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| Published / Filed: |
1985-06-04
/ 1983-02-14
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| Application Number: |
US1983000466267
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| IPC Code: |
Advanced:
H02J 3/36;
Core:
more...
IPC-7:
H02J 3/36;
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| U.S. Class: |
Current:
363/035;
363/037;
363/051;
Original:
363/035;
363/037;
363/051;
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| Field of Search: |
363/034,35,37,38,78,79,84,85,89,51
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| Priority Number: |
| 1983-02-14 |
US1983000466267 |
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| Abstract: |
The d-c bus current, fed to an inverter through a low pass filter, having a shunt-connected capacitor, from the output of an a-c energized a-c to d-c converter (such as a phase-controlled SCR rectifier bridge), is monitored by using a-c current transformers to sense the filter capacitor current and the a-c current supplied to the converter. The transformer output signals are employed to produce a d-c signal which is a reduced amplitude replica of, and has the identical waveshape as, the d-c bus current. The monitoring system is electrically isolated from the power circuitry by means of the a-c current transformers.
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| Attorney, Agent or Firm: |
Tracy, James E. ;
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| Primary / Asst. Examiners: |
Wong, Peter S.; Jones, Judson H.
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| Maintenance Status: |
E2 Expired Check current status
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| INPADOC Legal Status: |
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| Family: |
None
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First Claim:
Show all 11 claims |
I claim:
1. A monitoring system for monitoring the d-c bus current supplied over a d-c bus to an inverter and received through a low pass filter, having a series-connected filter choke and a shunt-connected filter capacitor, from the output of an a-c to d-c converter, to the input of which converter is applied a-c energy, said monitoring system comprising:
- input current sensing means, including at least one a-c current transformer and a rectifier, for sensing the a-c input current to the converter and deriving a d-c signal which is proportional to the d-c current produced at the output of the converter;
- capacitor current sensing means, including an a-c current transformer, for sensing the filter capacitor current to derive an a-c signal proportional thereto;
- and adding means for adding the two derived signals to produce a d-c signal which is directly proportional to, and very accurately represents, the d-c bus current.
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| Background / Summary: |
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| Drawing Descriptions: |
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| Description: |
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| Forward References: |
Show 17 U.S. patent(s) that reference this one
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