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US6603647B2
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Method for controlling freewheeling paths in a matrix converter
Assignee: Siemens AG
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Filing: 2002-09-27
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Granted: 2003-08-05
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Expires: 2022-09-27
Abstract
Abstract A method for controlling positive or negative freewheeling paths of the phases of a matrix converter with nine bidirectional power switches arranged in a 3x3 switch matrix is described. Each power switch has two back-to-back series-connected semiconductor switches. Those semiconductor switches are actuated that have the most positive/negative line voltage to provide a negative/positive freewheeling path capable of carrying a negative/positive load current. The matrix converter can be immediately disconnected if an error is detected or if the matrix converter is inadvertently switched off, without damaging the matrix converter.
Inventors
- 👤 Christian Briesen
- 👤 Manfred Bruckmann
- 👤 Marco Kaiser
- 👤 Hubert Schierling
- 👤 Olaf Simon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 19:02
CPC Classifications
H; H02; H02M; H02M5/00; H02M5/02; H02M5/04; H02M5/22; H02M5/25; H02M5/27; H02M5/271
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
144 words
A method for controlling a positive or negative freewheeling path in a phase of a matrix converter having nine bidirectional power switches arranged in a 3×3 switch matrix, with each power switch associated with a matrix converter phase and having two back-to-back series-connected semiconductor switches, comprising the steps of: a) identifying a bidirectional power switch of a matrix converter phase having a most negative line voltage; b) identifying a bidirectional power switch of a matrix converter phase having a most positive line voltage; c) actuating the semiconductor switch of the identified bidirectional power switch having the most negative line voltage to provide a positive freewheeling path capable of carrying a positive load current, and d) actuating the semiconductor switch of the identified bidirectional power switch having the most positive line voltage to provide a negative freewheeling path capable of carrying a negative load current.
Claim 2
Independent Claim
144 words
A method for controlling a positive or negative freewheeling path in a phase of a matrix converter having nine bidirectional power switches arranged in a 3×3 switch matrix, with each power switch associated with a matrix converter phase and having two back-to-back series-connected semiconductor switches, comprising the steps of: a) identifying a bidirectional power switch of a matrix converter phase having a most negative line voltage; b) identifying a bidirectional power switch of a matrix converter phase having a most positive line voltage; c) actuating the semiconductor switch of the identified bidirectional power switch having the most negative line voltage to provide a positive freewheeling path capable of carrying a positive load current, and d) actuating the semiconductor switch of the identified bidirectional power switch having the most positive line voltage to provide a negative freewheeling path capable of carrying a negative load current.
Claim 3
Dependent Claim
46 words
The method of claim 1 , and further comprising the steps of determining a polarity of a plurality of phase-to-phase input voltages of the matrix converter, and determining the most positive and the most negative line voltage based on the polarity of the phase-to-phase input voltages.
Claim 4
Dependent Claim
37 words
The method as claimed in claim 2 , and further comprising the steps of determining the most positive and the most negative line voltage based on the polarity of the phase-to-phase input voltages by using a table.
Claim 5
Independent Claim
164 words
A method for controlling a positive or negative freewheeling path in a phase of a matrix converter having nine bidirectional power switches arranged in a 3×3 switch matrix, with each power switch associated with a matrix converter phase and having two back-to-back series-connected semiconductor switches, comprising the steps of: a) determining a phase-to-phase input voltage of at least two matrix converter phases; b) determining one of a positive and a negative zero crossing of the phase-to-phase input voltage and the two bidirectional power switches associated with the zero crossing; c) selecting from each of the two bidirectional power switches a semiconductor switch to provide corresponding positive and negative freewheeling paths in a region of the zero crossing; d) actuating the selected semiconductor switch if the selected semiconductor switch is identical to a semiconductor switch determined with a commutation method, and e) actuating both selected semiconductor switches if none of the selected semiconductor switches is identical to a semiconductor switch determined with the commutation method.
Claim 6
Independent Claim
164 words
A method for controlling a positive or negative freewheeling path in a phase of a matrix converter having nine bidirectional power switches arranged in a 3×3 switch matrix, with each power switch associated with a matrix converter phase and having two back-to-back series-connected semiconductor switches, comprising the steps of: a) determining a phase-to-phase input voltage of at least two matrix converter phases; b) determining one of a positive and a negative zero crossing of the phase-to-phase input voltage and the two bidirectional power switches associated with the zero crossing; c) selecting from each of the two bidirectional power switches a semiconductor switch to provide corresponding positive and negative freewheeling paths in a region of the zero crossing; d) actuating the selected semiconductor switch if the selected semiconductor switch is identical to a semiconductor switch determined with a commutation method, and e) actuating both selected semiconductor switches if none of the selected semiconductor switches is identical to a semiconductor switch determined with the commutation method.
Claim 7
Dependent Claim
149 words
The method of claim 4 , and further comprising the steps of: f) identifying a bidirectional power switch of a matrix converter phase having a most negative line voltage; g) identifying a bidirectional power switch of a matrix converter phase having a most positive line voltage; h) actuating the semiconductor switch of the identified bidirectional power switch having the most negative line voltage to provide a positive freewheeling path capable of carrying a positive load current, i) actuating the semiconductor switch of the identified bidirectional power switch having the most positive line voltage to provide a negative freewheeling path capable of carrying a negative load current, and k) when one of a positive and a negative zero crossing of the phase-to-phase input voltage is detected, immediately carrying out steps a) through e), while leaving the semiconductor switches actuated in steps f) through i) switched on for a predetermined time.
Claim 8
Dependent Claim
74 words
The method of claim 4 , and further comprising the steps of determining an amplitude of a plurality of phase-to-phase input voltages of the matrix converter; comparing the amplitudes of the determined phase-to-phase input voltages with one of a positive and negative reference value; and generating a switching signal for a corresponding semiconductor switch when the amplitudes of the determined phase-to-phase input voltages undershoot the negative reference value or overrange the positive reference value.
References Cited (Backward Citations)
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| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 2006-08-04 | 2007-02-03 | 2007-08-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2010-08-04 | 2011-02-03 | 2011-08-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2014-08-04 | 2015-02-03 | 2015-08-05 | $7700.00 | Window Closed / Lapsed |