Title:
METHOD AND DEVICE TO PROTECT AN ESP POWER SUPPLY FROM TRANSIENT OVER-VOLTAGES ON THE POWER GRID
Document Type and Number:
WIPO Patent Application WO/2012/045666
Kind Code:
A3
Abstract:
A power supply converter unit is disclosed, in particular for an electrostatic precipitator, converting the frequency of alternating input supply (1) to high frequency alternating output (Ua, Ub) by rectifying the alternating input supply (1) in a rectifier (12) to a direct current (Udc), which is converted to alternating-current in a full bridge inverter (13) in a H-bridge circuit with switches (48) controlled by a control unit (23). According to the invention on the input side of the rectifier (12) and/or in the direct current (Udc) section there is provided at least one overvoltage protection circuitry (34, 35, 37-39, 45). Furthermore the invention discloses a method of operation of such a power supply converter unit as well as uses of such a power supply converter unit.
Inventors:
RANSTAD PER (SE)
LINNER JOERGEN (SE)
LINNER JOERGEN (SE)
Application Number:
PCT/EP2011/067061
Publication Date:
January 03, 2013
Filing Date:
September 30, 2011
Export Citation:
Assignee:
ALSTOM TECHNOLOGY LTD (CH)
RANSTAD PER (SE)
LINNER JOERGEN (SE)
RANSTAD PER (SE)
LINNER JOERGEN (SE)
International Classes:
H02M1/32; H02H7/12; H02M3/337; H02M5/458
Foreign References:
| DE102007007922A1 | 2008-08-28 | |||
| US20010006469A1 | 2001-07-05 | |||
| US20090154034A1 | 2009-06-18 | |||
| EP1870994A1 | 2007-12-26 | |||
| US20070121354A1 | 2007-05-31 | |||
| US5889659A | 1999-03-30 | |||
| US5317498A | 1994-05-31 | |||
| US5438502A | 1995-08-01 |
Attorney, Agent or Firm:
ALSTOM TECHNOLOGY LTD (Brown Boveri Strasse 7/664/2, Baden, CH)
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