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US4933828A
Expired / Lapsed
US
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Control system for voltage-source pulse width modulation step-up rectifier
Assignee: Toshiba Corp
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Filing: 1989-08-02
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Granted: 1990-06-12
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Expires: 2009-08-02
Abstract
Abstract In a voltage-source PWM step-up converter connected to an a.c. power supply through a reactor, even in the case where a reactor voltage drop V L changes in dependence upon a load current, it is required to compensate such a change to control a d.c. voltage so that it is equal to a predetermined value. Since this reactor voltage drop V L has a phase shift of substantially 90 degrees with respect to an a.c. power supply voltage, a control signal for compensating such a phase shift, resulting in the possibility that is exceeds above a linear control range of the control circuit to reach the saturation range. In view of this, in accordance with this invention, control signal means for compensating a reactor voltage drop V L is provided in the control circuit, thereby making it possible to perform a stable control to provide a stable d.c. output.
Inventors
- 👤 Yutaka Ogawa
- 👤 Toshio Kadokura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 18:59
CPC Classifications
H; H02; H02M; H02M5/00; H02M5/40; H02M5/42; H02M5/44; H02M5/453; H02M5/458; H02M5/4585
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
257 words
A control system for a voltage-source pulse width modulation step-up converter (hereinafter abbreviated as a PWM converter) comprising: a reactor connected in series between an a.c. power supply and an a.c. terminal of said PWM converter, a smoothing capacitor connected between d.c. terminals of said PWM converter, means for detecting an input voltage applied to said reactor, means for detecting a d.c. voltage V across said smoothing capacitor, means for detecting a load current flowing in said PWM converter, means for setting a voltage reference V* with respect to said PWM converter, means for outputting a current amplitude reference |I*| on the basis of a deviation between said voltage reference V* and said d.c. voltage V, means for outputting a current reference I U * synchronous with said input voltage to said reactor and having an amplitude corresponding to said current amplitude reference |I*|, means for outputting a voltage command V A for allowing said load current I to be in correspondence with said current reference I U *, means for outputting a voltage compensation command V LC leading said input voltage to said reactor by a phase angle of 90 degrees and having an amplitude corresponding to said current amplitude reference |I*|, means for calculating a vector sum of said voltage command V A and said voltage compensation command V LC to output said vector sum as a PWM control command V B , and means for effecting a PWM control of said PWM converter on the basis of said PWM control command V B .
Claim 2
Dependent Claim
257 words
A control system for a voltage-source pulse width modulation step-up converter (hereinafter abbreviated as a PWM converter) comprising: a reactor connected in series between an a.c. power supply and an a.c. terminal of said PWM converter, a smoothing capacitor connected between d.c. terminals of said PWM converter, means for detecting an input voltage applied to said reactor, means for detecting a d.c. voltage V across said smoothing capacitor, means for detecting a load current flowing in said PWM converter, means for setting a voltage reference V* with respect to said PWM converter, means for outputting a current amplitude reference |I*| on the basis of a deviation between said voltage reference V* and said d.c. voltage V, means for outputting a current reference I U * synchronous with said input voltage to said reactor and having an amplitude corresponding to said current amplitude reference |I*|, means for outputting a voltage command V A for allowing said load current I to be in correspondence with said current reference I U *, means for outputting a voltage compensation command V LC leading said input voltage to said reactor by a phase angle of 90 degrees and having an amplitude corresponding to said current amplitude reference |I*|, means for calculating a vector sum of said voltage command V A and said voltage compensation command V LC to output said vector sum as a PWM control command V B , and means for effecting a PWM control of said PWM converter on the basis of said PWM control command V B .
Claim 3
Dependent Claim
96 words
A control system as set forth in claim 1, wherein said means for outputting said current reference I U * is composed of a sine-wave reference generator for outputting, as a sine wave reference, in the form of a digital signal, a sample value synchronous with said input voltage to said reactor and corresponding to an instantaneous value of said input voltage, and a digital-to-analog converter for outputting, in the form of an analog signal, a signal corresponding to a product of an output signal from said sine-wave reference generator and said current amplitude reference |I*|.
Claim 4
Dependent Claim
106 words
A control system as set forth in claim 1, wherein said means for outputting voltage compensation command V LC is composed of a sine-wave reference generator for Outputting, as an input voltage sine wave reference, in the form of a digital signal, a sample value leading said input voltage to said reactor by a phase angle of 90 degrees and corresponding to an instantaneous value of said input voltage to said reactor, and a multiplying digital-to-analog converter for outputting, in the form an analog signal, a signal corresponding to a product of an output signal from said sine-wave reference generator and said current amplitude reference |I*|.
Claim 5
Dependent Claim
64 words
A control system as set forth in claim 1, wherein said means for carrying out PWM control includes an oscillator for generating a triangular carrier wave, and a PWM comparator responsive to said triangular carrier wave generated by said oscillator and said PWM control command Vs to output a control command for carrying out an ON/OFF control of switching elements of said PWM converter.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-06-11 | 1993-12-11 | 1994-06-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-06-11 | 1997-12-11 | 1998-06-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-06-11 | 2001-12-11 | 2002-06-12 | $7700.00 | Window Closed / Lapsed |