US5751567A
Expired / Lapsed
US
⏱️ 0.0 years remaining
AC-DC converter
Assignee: Fuji Electric Co Ltd
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Filing: 1997-01-10
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Granted: 1998-05-12
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Expires: 2017-01-10
Abstract
Abstract An AC-DC converter includes an adjusting unit 13 which operates to zero the difference between a DC output voltage instruction value and a DC output voltage detection value; and a modulator 16 which compares a carrier wave based on an output signal of the adjusting unit 13 with a modulating wave to output drive pulses, a switching element 3 is turned on and off with the drive pulses to provide a DC output voltage which is higher than a full-wave rectification voltage of an AC input voltage. In order to obtain the carrier wave, the AC-DC comprises further includes an AC input voltage polarity detector 7, a PLL circuit 11, and a multiplier 14 for multiplying the sine wave by an output signal of the adjusting unit 13.
Inventors
- 👤 Jiro Toyozaki
- 👤 Takao Yanase
- 👤 Shinichi Ishii
- 👤 Takashi Aihara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 09:55
CPC Classifications
H; H02; H02M; H02M1/00; H02M1/42; H02M1/4208; H02M7/00; H02M7/02; H02M7/04; H02M7/12; H02M7/21; H02M7/217; H02M7/219; H02M1/0083; H02M1/0085; Y; Y02; Y02B; Y02B70/00; Y02B70/10
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
180 words
An AC-DC converter, comprising: DC output voltage instruction setting means for setting a DC output voltage instruction value; DC output voltage detecting means for detecting a DC output voltage detection value; adjusting means for adjusting which operates to zero a difference between the DC output voltage instruction value and the DC output voltage detection value to zero; means for generating a modulating wave; a modulator for comparing a carrier wave based on an output signal from said adjusting means with the modulating wave to output drive pulses; a switching element which turns on and off according to the drive pulses to provide a DC output voltage higher than a full-wave rectification voltage of an AC input voltage; an AC power source for generating an AC input voltage; means for detecting the polarity of the AC input voltage; means for generating a sine wave synchronous with the AC input voltage according to a detection value from said polarity detecting means; and a multiplier for multiplying the sine wave by an output signal of said adjusting means to obtain the carrier wave.
Claim 2
Dependent Claim
180 words
An AC-DC converter, comprising: DC output voltage instruction setting means for setting a DC output voltage instruction value; DC output voltage detecting means for detecting a DC output voltage detection value; adjusting means for adjusting which operates to zero a difference between the DC output voltage instruction value and the DC output voltage detection value to zero; means for generating a modulating wave; a modulator for comparing a carrier wave based on an output signal from said adjusting means with the modulating wave to output drive pulses; a switching element which turns on and off according to the drive pulses to provide a DC output voltage higher than a full-wave rectification voltage of an AC input voltage; an AC power source for generating an AC input voltage; means for detecting the polarity of the AC input voltage; means for generating a sine wave synchronous with the AC input voltage according to a detection value from said polarity detecting means; and a multiplier for multiplying the sine wave by an output signal of said adjusting means to obtain the carrier wave.
Claim 3
Dependent Claim
166 words
An AC-DC converter, comprising: DC output voltage instruction setting means for setting a DC output voltage instruction value; DC output voltage detecting means for detecting a DC output voltage detection value; adjusting means for adjusting which operates to zero a difference between the DC output voltage instruction value and the DC output voltage detection value to zero; means for generating a modulating wave; a modulator for comparing a carrier wave based on an output signal from said adjusting means with the modulating wave to output drive pulses; a switching element which turns on and off according to the drive pulses to provide a DC output voltage higher than a full-wave rectification voltage of an AC input voltage; an AC power source for generating an AC input voltage; means for detecting an AC input voltage to output an AC input voltage detection value; and a multiplier for multiplying the AC input voltage detection value by an output signal from the adjusting means to obtain the carrier wave.
Claim 4
Dependent Claim
166 words
An AC-DC converter, comprising: DC output voltage instruction setting means for setting a DC output voltage instruction value; DC output voltage detecting means for detecting a DC output voltage detection value; adjusting means for adjusting which operates to zero a difference between the DC output voltage instruction value and the DC output voltage detection value to zero; means for generating a modulating wave; a modulator for comparing a carrier wave based on an output signal from said adjusting means with the modulating wave to output drive pulses; a switching element which turns on and off according to the drive pulses to provide a DC output voltage higher than a full-wave rectification voltage of an AC input voltage; an AC power source for generating an AC input voltage; means for detecting an AC input voltage to output an AC input voltage detection value; and a multiplier for multiplying the AC input voltage detection value by an output signal from the adjusting means to obtain the carrier wave.
Claim 5
Dependent Claim
200 words
An AC-DC converter as claimed in claim 1, wherein DC output voltage instruction setting means for setting a DC output voltage instruction value; DC output voltage detecting means for detecting a DC output voltage detection value; adjusting means for adjusting which operates to zero a difference between the DC output voltage instruction value and the DC output voltage detection value to zero; means for generating a modulating wave; a modulator for comparing a carrier wave based on an output signal from said adjusting means with the modulating wave to output drive pulses; a switching element which turns on and off according to the drive pulses to provide a DC output voltage higher than a full-wave rectification voltage of an AC input voltage; an AC power source for generating an AC input voltage; means for detecting the polarity of an AC input voltage to output an AC input voltage polarity detection value; means for generating a waveform which is synchronous with the AC input voltage and is zero in one-period integration value according to the AC input voltage polarity detection value; and a multiplier for multiplying the waveform by an output signal from the adjusting means to obtain the carrier wave.
Claim 6
Dependent Claim
22 words
An AC-DC converter as claimed in claim 3, wherein the waveform is changed in configuration and/or phase according to a load factor.
Claim 7
Dependent Claim
206 words
An AC-DC converter, comprising: DC output voltage instruction setting means for setting a DC output voltage instruction value; DC output voltage detecting means for detecting a DC output voltage detection value; adjusting means for adjusting which operates to zero a difference between the DC output voltage instruction value and the DC output voltage detection value to zero; means for generating a modulating wave; a modulator for comparing a carrier wave based on an output signal from said adjusting means with the modulating wave to output drive pulses; a switching element which turns on and off according to the drive pulses to provide a DC output voltage higher than a full-wave rectification voltage of an AC input voltage; an AC power source for generating an AC input voltage; means for detecting an AC input voltage to output an AC input voltage detection value; a function generator for outputting a waveform which is synchronous with the AC input voltage and has a frequency which is an integer multiple of the frequency of the AC input voltage and which is zero in one-period integration value; and an adder for adding an output waveform from said function generator to the AC input voltage detection value to obtain the carrier wave.
Claim 8
Dependent Claim
206 words
An AC-DC converter, comprising: DC output voltage instruction setting means for setting a DC output voltage instruction value; DC output voltage detecting means for detecting a DC output voltage detection value; adjusting means for adjusting which operates to zero a difference between the DC output voltage instruction value and the DC output voltage detection value to zero; means for generating a modulating wave; a modulator for comparing a carrier wave based on an output signal from said adjusting means with the modulating wave to output drive pulses; a switching element which turns on and off according to the drive pulses to provide a DC output voltage higher than a full-wave rectification voltage of an AC input voltage; an AC power source for generating an AC input voltage; means for detecting an AC input voltage to output an AC input voltage detection value; a function generator for outputting a waveform which is synchronous with the AC input voltage and has a frequency which is an integer multiple of the frequency of the AC input voltage and which is zero in one-period integration value; and an adder for adding an output waveform from said function generator to the AC input voltage detection value to obtain the carrier wave.
Claim 9
Dependent Claim
27 words
An AC-DC converter as claimed in claim 5, wherein an output waveform of said function generator is changed in configuration or phase according to a load factor.
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) | 2001-05-11 | 2001-11-10 | 2002-05-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-05-11 | 2005-11-10 | 2006-05-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-05-11 | 2009-11-10 | 2010-05-12 | $7700.00 | Window Closed / Lapsed |