GB1342930A - Pulse width modulation systems - Google Patents
Pulse width modulation systemsInfo
- Publication number
- GB1342930A GB1342930A GB1342930DA GB1342930A GB 1342930 A GB1342930 A GB 1342930A GB 1342930D A GB1342930D A GB 1342930DA GB 1342930 A GB1342930 A GB 1342930A
- Authority
- GB
- United Kingdom
- Prior art keywords
- frequency
- gates
- exclusive
- square wave
- divider
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/497—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode sinusoidal output voltages being obtained by combination of several voltages being out of phase
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Control Of Ac Motors In General (AREA)
Abstract
1342930 Inverting; control of AC motors ELECTRICAL RESEARCH ASSOCIATION 22 May 1972 [21 May 1971] 16281/71 Headings H2F and H2J A method of generating a pulse width modulated waveform which may be integrated to form a generally sinusoidal waveform comprises feeding two square waves to respective inputs of either an exclusive-OR or an equivalent gate, the square waves having a difference in frequency equal to the required frequency of the waveform to be synthesized. As described, a square wave oscillator M1 feeds two bi-stable divider circuits B1, B2 which divide the frequency by different amounts to provide two signals differing in frequency by an amount equal to the required frequency. Three-phase signals at the B1 frequency fAO (Fig. 2a) are derived by a ring counter end fed to exclusive-OR gates G1 ... G6 which are controlled by a square wave at the B2 frequency fBO. The outputs of gates G1 ... G3 shown at fCO are fed to control switching devices S1 ... S6 which control the AC to a motor having windings L1 ... L3. Exclusive-OR gates G4 ... G6 are controlled by a square wave fB1 obtained by delaying the input to a further divider B3. The effective voltage applied to the motor L1 ... L3 is varied by adjustment of the delay imposed on the input to divider B3. Figs. 3a, 3b (not shown) relate to waveforms showing the reversal of phase rotation occurring when frequency fB is made greater than fA.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB1628171 | 1972-05-22 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1342930A true GB1342930A (en) | 1974-01-10 |
Family
ID=10074499
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB1342930D Expired GB1342930A (en) | 1972-05-22 | 1972-05-22 | Pulse width modulation systems |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB1342930A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2377095A (en) * | 2001-03-06 | 2002-12-31 | Bosch Gmbh Robert | Method of generating offset drive control signals for half bridge converters |
DE10234594A1 (en) * | 2002-07-30 | 2004-02-19 | Daimlerchrysler Ag | Generator / engine system and method of operating this generator / engine system |
US7202572B2 (en) | 2002-07-30 | 2007-04-10 | Daimlerchrysler Ag | Generator/motor system and method of operating said system |
-
1972
- 1972-05-22 GB GB1342930D patent/GB1342930A/en not_active Expired
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2377095A (en) * | 2001-03-06 | 2002-12-31 | Bosch Gmbh Robert | Method of generating offset drive control signals for half bridge converters |
GB2377095B (en) * | 2001-03-06 | 2003-06-04 | Bosch Gmbh Robert | Method of generating offset drive control signals |
DE10234594A1 (en) * | 2002-07-30 | 2004-02-19 | Daimlerchrysler Ag | Generator / engine system and method of operating this generator / engine system |
DE10234594B4 (en) * | 2002-07-30 | 2005-02-24 | Daimlerchrysler Ag | Generator / engine system and method of operating this generator / engine system |
US7202572B2 (en) | 2002-07-30 | 2007-04-10 | Daimlerchrysler Ag | Generator/motor system and method of operating said system |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed | ||
PLNP | Patent lapsed through nonpayment of renewal fees |