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Title: Pulse width modulation inverter with battery charger

Abstract

An inverter is connected between a source of DC power and a three-phase AC induction motor, and a microprocessor-based circuit controls the inverter using pulse width modulation techniques. In the disclosed method of pulse width modulation, both edges of each pulse of a carrier pulse train are equally modulated by a time proportional to sin [theta], where [theta] is the angular displacement of the pulse center at the motor stator frequency from a fixed reference point on the carrier waveform. The carrier waveform frequency is a multiple of the motor stator frequency. The modulated pulse train is then applied to each of the motor phase inputs with respective phase shifts of 120[degree] at the stator frequency. Switching control commands for electronic switches in the inverter are stored in a random access memory (RAM) and the locations of the RAM are successively read out in a cyclic manner, each bit of a given RAM location controlling a respective phase input of the motor. The DC power source preferably comprises rechargeable batteries and all but one of the electronic switches in the inverter can be disabled, the remaining electronic switch being part of a flyback'' DC-DC converter circuit for recharging the battery.more » 11 figs.« less

Inventors:
Publication Date:
OSTI Identifier:
7251164
Patent Number(s):
US 4491768; A
Application Number:
CNN: DEN 3-211; PPN: US 6-318083
Assignee:
Eaton Corp., Cleveland, OH (United States)
Resource Type:
Patent
Resource Relation:
Patent File Date: 4 Nov 1981
Country of Publication:
United States
Language:
English
Subject:
24 POWER TRANSMISSION AND DISTRIBUTION; 25 ENERGY STORAGE; ELECTRIC BATTERIES; INVERTERS; COMPUTERIZED CONTROL SYSTEMS; FREQUENCY MODULATION; BATTERY CHARGING; SWITCHING CIRCUITS; CONTROL SYSTEMS; ELECTRICAL EQUIPMENT; ELECTROCHEMICAL CELLS; ELECTRONIC CIRCUITS; EQUIPMENT; MODULATION; ON-LINE CONTROL SYSTEMS; ON-LINE SYSTEMS; 240100* - Power Systems- (1990-); 250903 - Energy Storage- Batteries- Materials, Components, & Auxiliaries

Citation Formats

Slicker, J M. Pulse width modulation inverter with battery charger. United States: N. p., 1985. Web.
Slicker, J M. Pulse width modulation inverter with battery charger. United States.
Slicker, J M. Tue . "Pulse width modulation inverter with battery charger". United States.
@article{osti_7251164,
title = {Pulse width modulation inverter with battery charger},
author = {Slicker, J M},
abstractNote = {An inverter is connected between a source of DC power and a three-phase AC induction motor, and a microprocessor-based circuit controls the inverter using pulse width modulation techniques. In the disclosed method of pulse width modulation, both edges of each pulse of a carrier pulse train are equally modulated by a time proportional to sin [theta], where [theta] is the angular displacement of the pulse center at the motor stator frequency from a fixed reference point on the carrier waveform. The carrier waveform frequency is a multiple of the motor stator frequency. The modulated pulse train is then applied to each of the motor phase inputs with respective phase shifts of 120[degree] at the stator frequency. Switching control commands for electronic switches in the inverter are stored in a random access memory (RAM) and the locations of the RAM are successively read out in a cyclic manner, each bit of a given RAM location controlling a respective phase input of the motor. The DC power source preferably comprises rechargeable batteries and all but one of the electronic switches in the inverter can be disabled, the remaining electronic switch being part of a flyback'' DC-DC converter circuit for recharging the battery. 11 figs.},
doi = {},
url = {https://www.osti.gov/biblio/7251164}, journal = {},
number = ,
volume = ,
place = {United States},
year = {1985},
month = {1}
}