Title:
CONTROL OF INVERTER AND INVERTER EQUIPMENT
Document Type and Number:
Japanese Patent JP3262160
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To make it possible to stabilize the output current of an inverter by controlling the frequency of the output voltage of the inverter so as to reduce a ripple based on a ripple component of an effective value or an average value of detected output current of the variable frequency and variable voltage type inverter.
SOLUTION: A cyclic overcurrent component which is an unstable component included in the output current of an inverter circuit 2 varies its effective value in cycles several times as many as that of a fundamental wave and does not stay the same. It is a combined wave of a DC component and a ripple component. Output currents for driving a three-phase induction motor 3 as a load of the inverter circuit 2 are detected by current detectors 5a-5c and effective values are detected by an effective value detecting means 8. A frequency command correcting means 9 corrects a frequency command generated by a frequency command generator 7 based on the currents detected by the effective value detecting means 8 and sends the corrected values to a control signal generating circuit 6 as corrected frequencies. Then, sine wave signals having a 120° and a 240° phase difference are generated through first to third phase control signal generating circuits, a sine wave signal generating means, a chopping wave generating means, a comparator, and a distributor circuit.
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Inventors:
Seiichi Funakura
Application Number:
JP26489997A
Publication Date:
March 04, 2002
Filing Date:
September 10, 1997
Export Citation:
Assignee:
Sanken Electric Co., Ltd.
International Classes:
H02M1/12; H02M7/48; (IPC1-7): H02M7/48; H02M1/12
Domestic Patent References:
| JP8223807A | ||||
| JP1321868A | ||||
| JP819259A | ||||
| JP6209579A | ||||
| JP3139196A | ||||
| JP6430484A |
Attorney, Agent or Firm:
Noritsugu Takano