EP0144593A1
Expired / Lapsed
EP
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Control system for a voltage-type inverter
Assignee: Toshiba Corp
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Filing: 1984-10-01
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Granted: —
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Expires: 2004-10-01
Abstract
Abstract In a control system for a voltage-type inverter which comprises a bridge connection of electric valves each comprising a reverse parallel connection of a semiconductor switching element and a diode, and converts a DC power to an AC power by means of PWM control, a voltage detection means is provided to detect an output voltage of the inverter. A voltage correction circuits corrects the pulse width of the pulse width modulation signal in accordance with the comparison of the detected voltage and the PWM signal. A drive circuit, which provides a dead time during which the switching elements of the electric valves connected in series with each other are concurrently non-conductive, uses the corrected PWM signal for driving the switching element.
Inventors
- 👤 Chihiro Okado
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-05 11:24
CPC Classifications
H; H02; H02M; H02M7/00; H02M7/42; H02M7/44; H02M7/48; H02M7/53; H02M7/537; H02M7/5387; H02M7/53871; H02M7/53875; H03; H03K; H03K7/00; H03K7/08; H02M1/00; H02M1/38; H02M1/385
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
166 words
A control system for a voltage-type inverter which comprises a bridge connection of electric valves each comprising a reverse parallel connection of a semiconductor switching element and a diode, and converts a DC power to an AC power by means of pulse width modulation control, said control system comprising: pulse width modulation control means responsive to a reference value for producing pulse width modulation signals, voltage detection means for detecting an output voltage of the inverter to produce a voltage detection signal, voltage correction means responsive to the pulse width modulation signal and the voltage detection signal for correcting the pulse width of the pulse width modulation signal to produce a corrected pulse width modulation signal, and drive means responsive to the corrected pulse width modulation signal for driving the switching element of each valve of the inverter, said drive means including means for providing a dead time during which the switching elements of the electric valves connected in series with each other are concurrently non-conductive.
Claim 2
Dependent Claim
166 words
A control system for a voltage-type inverter which comprises a bridge connection of electric valves each comprising a reverse parallel connection of a semiconductor switching element and a diode, and converts a DC power to an AC power by means of pulse width modulation control, said control system comprising: pulse width modulation control means responsive to a reference value for producing pulse width modulation signals, voltage detection means for detecting an output voltage of the inverter to produce a voltage detection signal, voltage correction means responsive to the pulse width modulation signal and the voltage detection signal for correcting the pulse width of the pulse width modulation signal to produce a corrected pulse width modulation signal, and drive means responsive to the corrected pulse width modulation signal for driving the switching element of each valve of the inverter, said drive means including means for providing a dead time during which the switching elements of the electric valves connected in series with each other are concurrently non-conductive.
Claim 3
Dependent Claim
108 words
A system according to Claim 1, wherein said voltage correction means comprises narrower signal generator means responsive to the pulse width modulation signal for producing a narrower signal having a pulse width a little narrower than the pulse width modulation signal, wider signal generator means responsive to the pulse width modulation signal for producing a wider signal having a pulse width a little wider than the pulse with modulation signal, subtractor means responsive to the pulse width modulation signal and the voltage detection signal to determine the difference between them, and selecting means for selectively outputting the narrower signal or the wider signal in accordance with the difference.
Claim 4
Dependent Claim
37 words
A system according to Claim 2, wherein said selecting means comprises integrator means for integrating the difference, and means selecting the narrower signal or the wider signal depending on the polarity of the integral of the difference.
Claim 5
Dependent Claim
35 words
A system according to Claim 2, wherein the narrower signal is narrower and the wider signal is wider than the pulse width modulation signal by an amount which is approximately equal to the dead time.
Claim 6
Dependent Claim
20 words
A system according to Claim 4, wherein said amount is equal to or a little larger than the dead time.
Claim 7
Dependent Claim
31 words
A system according to Claim 1, wherein said voltage detection means comprises means for detecting the voltage across an output terminal of the inverter and a terminal of a fixed potential.
Claim 8
Dependent Claim
21 words
A system according to Claim 1, wherein said voltage detection means comprises means for detecting a voltage across the electric valve.
Claim 9
Dependent Claim
30 words
A system according to Claim 1, wherein said voltage detection signal produced by said voltage detection means is a binary signal assuming either a "high" level or a "low" level.
References Cited (Backward Citations)
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