Invention Grant
- Patent Title: Multi-pulse constant voltage transformer for a variable speed drive in chiller applications
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Application No.: US16126814Application Date: 2018-09-10
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Publication No.: US10707800B2Publication Date: 2020-07-07
- Inventor: Zhiqiao Wu , John C. Hansen
- Applicant: Johnson Controls Technology Company
- Applicant Address: US MI Auburn Hills
- Assignee: Johnson Controls Technology Company
- Current Assignee: Johnson Controls Technology Company
- Current Assignee Address: US MI Auburn Hills
- Agency: Fletcher Yoder P.C.
- Main IPC: H02P27/04
- IPC: H02P27/04 ; H01F30/14 ; H02M1/14 ; H02M7/06 ; F25B49/02 ; H02P13/06

Abstract:
A multi-pulse transformer with multiple taps provides a constant magnitude voltage output to a variable speed chiller's compressor motor over a range of input voltages. The 3-phase transformer includes primary windings and a plurality of secondary windings. The secondary windings are electromagnetically coupled with the associated primary winding. The primary windings include taps for receiving multiple input AC voltages and the secondary windings have a single output terminal for supplying a predetermined output voltage which, after rectification produces a DC multi-pulse waveform for powering a DC link of a variable speed drive. Alternatively the 3-phase transformer includes multiple taps on the secondary windings. Each of the primary windings has a terminal for receiving an input AC voltage. The taps of the secondary windings provide an output voltage that is converted to a multi-pulse waveform for powering a DC link of a variable speed drive.
Public/Granted literature
- US20190006976A1 MULTI-PULSE CONSTANT VOLTAGE TRANSFORMER FOR A VARIABLE SPEED DRIVE IN CHILLER APPLICATIONS Public/Granted day:2019-01-03
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