GB1342930A - Pulse width modulation systems - Google Patents

Pulse width modulation systems

Info

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
Application number
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ELECTRICAL RESEARCH ASS
Original Assignee
ELECTRICAL RESEARCH ASS
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by ELECTRICAL RESEARCH ASS filed Critical ELECTRICAL RESEARCH ASS
Publication of GB1342930A publication Critical patent/GB1342930A/en
Expired legal-status Critical Current

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.
GB1342930D 1972-05-22 1972-05-22 Pulse width modulation systems Expired GB1342930A (en)

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)

* Cited by examiner, † Cited by third party
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

Cited By (5)

* Cited by examiner, † Cited by third party
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