EP0116706B1
Expired / Lapsed
EP
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Control system for a voltage-type inverter
Assignee: Toshiba Corp
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Filing: 1983-12-08
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Granted: 1986-10-08
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Expires: 2003-12-08
Abstract
No abstract record available.
Inventors
- 👤 Chihiro Okado
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-02 01:32
CPC Classifications
H; H02; H02M; H02M7/00; H02M7/42; H02M7/44; H02M7/48; H02M7/53; H02M7/537; H02M7/5387; H02M7/53871; H02M7/53875; H02M1/00; H02M1/38; H02M1/385
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
140 words
A control system for a voltage-type inverter (2) which comprises a bridge connection (2) of electric switching units each comprising a reverse parallel connection of a semiconductor switching element (21-26) and a diode (31-36), and converts DC power to AC power by means of pulse width modulation control whereby semiconductor switching elements connected in series between the input terminals are switched on and off alternatingly with a short time interval between the off-timing of one switching element and the on-timing of the other switching element, said control system comprising: detection means (14, 15, 16) for deriving a signal representative of the direction of current through each switching unit, and compensating means (17, 18, 19; 44) for compensating, in accordance with the result of the detection, variations in the voltage caused by said time intervals in dependence on the current direction.
Claim 2
Dependent Claim
140 words
A control system for a voltage-type inverter (2) which comprises a bridge connection (2) of electric switching units each comprising a reverse parallel connection of a semiconductor switching element (21-26) and a diode (31-36), and converts DC power to AC power by means of pulse width modulation control whereby semiconductor switching elements connected in series between the input terminals are switched on and off alternatingly with a short time interval between the off-timing of one switching element and the on-timing of the other switching element, said control system comprising: detection means (14, 15, 16) for deriving a signal representative of the direction of current through each switching unit, and compensating means (17, 18, 19; 44) for compensating, in accordance with the result of the detection, variations in the voltage caused by said time intervals in dependence on the current direction.
Claim 3
Dependent Claim
23 words
A system according to claim 1, wherein said detection means comprises means (14, 15, 16) for detecting the output current of the inverter.
Claim 4
Dependent Claim
58 words
A system according to claim 1, wherein said detection means comprises means (41) for detecting the voltage across an output terminal (U) of the inverter and a terminal (0) of a fixed potential, and latching means (43) for latching the detected voltage at the leading edge of the drive signal (V 21 ,) of an electric switching unit.
Claim 5
Dependent Claim
46 words
A system according to claim 1, wherein said detection means comprises means (41) for detecting a voltage across the electric switching unit (21, 31), and latching means (43) for latching the detected voltage at the leading edge of the drive signal of an electric switching unit.
Claim 6
Dependent Claim
69 words
A system according to claim 1, wherein said electric switching unit comprises a transistor (21) and a diode (31) connected in reverse parallel with each other, and said detection means comprises means (41) for detecting the voltage across the base (B) and the emitter (E) of the transistor and latching means (43) for latching the detected voltage at the leading edge of the signal of an electric switching unit.
Claim 7
Dependent Claim
86 words
A system according to claim 1, wherein said electric switching unit comprises a GTO (61) and a diode (31) connected in reverse parallel with each other, and another diode (62) connected in reverse parallel with the gate and the anode (A) of the GTO, and said detection means comprises means for detecting the voltage across the gate and the cathode of the GTO and latching means for latching the detected signal at the leading edge of the drive signal of an electric switching unit (Fig. 16).
Claim 8
Dependent Claim
32 words
A system according to claim 1, wherein said compensating means is adapted to correct the voltage reference used for the pulse-width modulation control in accordance with the detected direction of the current.
Claim 9
Dependent Claim
112 words
A system according to claim 7, further comprising means for providing a first reference signal (V*, V*, V w *) indicating the desired value of the output voltage of the inverter, wherein said compensating means comprises means for providing a correction signal (V △u , V av , V ew ) having a magnitude corresponding to the time length for which the switching elements of the electric switching units connected in series with each other are concurrently non-conductive, and adding means (20a, 20b, 20c) for adding said first reference signal and the correction signal to provide a second voltage reference (V*, V*, V w *) used for the pulse-width modulation (Fig. 8).
Claim 10
Dependent Claim
37 words
A system according to claim 8, wherein said correction signal is of a magnitude proportional to the length for which the switching elements of the electric switching units connected in series with each other are concurrently non-conductive.
Claim 11
Dependent Claim
28 words
A system according to claim 8, wherein said correction signal is of a fixed magnitude and is either positive or negative depending on the direction of the current.
References Cited (Backward Citations)
No citation records indexed.
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