Electric power conversion systems – Current conversion – With means to introduce or eliminate frequency components
Patent
1984-11-16
1987-01-06
Salce, Patrick R.
Electric power conversion systems
Current conversion
With means to introduce or eliminate frequency components
363 98, 363132, H02M 112, H02M 114
Patent
active
046351779
ABSTRACT:
Prior types of neutral point clamped PWM inverters have included memories for storing a plurality of PWM waveforms, one of which is utilized to control switches in the inverter to maintain an output parameter within prescribed limits. Such types of inverter controls, however, cannot provide the necessary degree of regulation in some applications. To overcome this problem, an inverter control according to the present invention permits on-line generation of PWM patterns for a neutral point clamped PWM inverter. The control includes circuitry for generating a depth of modulation signal representing the deviation of the output of the inverter from a desired level. A microprocessor and memory are coupled to the generating circuitry for calculating switching points for the inverter switches during operation of the inverter based upon the depth of modulation signal for a given number of pulses to be produced during each half cycle of the output. Timer modules are coupled to the microprocessor for developing switch control signals for each switch from the switching points so that the switches are operated to reduce the deviation of the output from the desired level.
REFERENCES:
patent: 3286155 (1966-11-01), Corey
patent: 4086623 (1978-04-01), Jensen
patent: 4348734 (1982-09-01), Dougherty
patent: 4443841 (1984-04-01), Mikami et al.
patent: 4466070 (1984-08-01), Claussen
patent: 4507724 (1985-03-01), Glennon
patent: 4520437 (1985-05-01), Boettcher, Jr. et al.
"A New Neutral-Point-Clamped PWM Inverter" by Nabae et al., IEEE Transactions on Industry Applications, vol. 1A-17, No. 5, Sep./Oct., 1981, pp. 518-523.
"New Format Step-wave Inverter", by Naniwae from the 1980 National Meeting of Denki Gakkai and translation.
"A New Neutral-Point-Clamped PWM Inverter" by Nabae et al, copyright 1980, IEEE, pp. 761-766 from IAS Annual Meeting.
Dhyanchand P. John
Shekhawat Sampat S.
Thollot Pierre
Hoff Marc S.
Salce Patrick R.
Sundstrand Corporation
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