Frequency converter, procedure for controlling it and motor control using a frequency converter
First Claim
1. A method for converting a first alternating voltage into a second alternating voltage with respect to frequency and amplitude using a first bridge having a plurality of branches and a plurality of first switches, each branch having at least one first switch, a second bridge having a plurality of second switches, and a resonant circuit connected between the bridges, the method comprising the step of:
- (a) connecting the first alternating voltage across the resonant circuit via at least two first switches of the first bridge for a first period substantially equal to half the cycle of the characteristic frequency of the resonant circuit formed, the at least two first switches being in different branches of the first bridge; and
(b) connecting the resonant circuit across the second alternating voltage via at least two of the second switches of the second bridge for a second period substantially equal to half the cycle of the characteristic frequency of the resonant circuit formed.
1 Assignment
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Accused Products
Abstract
A procedure and an apparatus for converting a first alternating voltage into a second alternating voltage with respect to frequency and amplitude by means of first (1) and second (2) bridges having switches (T1 . . . T12), and a resonant circuit (3) connected between the bridges. The invention also relates to the use of a frequency converter for the control of a motor. The voltages of a supplying network and the voltages of a load (M) are connected across the resonant circuit (3) in an alternating fashion by means of bridge switches (T1 . . . T6) and bridge switches (T7 . . . T12), respectively. The voltages are alternately connected across the resonant circuit for a period equal to respective half cycles of the characteristic frequency of the resulting resonant circuit formed. When power is supplied, a bridge change is effected after each period.
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Citations
17 Claims
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1. A method for converting a first alternating voltage into a second alternating voltage with respect to frequency and amplitude using a first bridge having a plurality of branches and a plurality of first switches, each branch having at least one first switch, a second bridge having a plurality of second switches, and a resonant circuit connected between the bridges, the method comprising the step of:
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(a) connecting the first alternating voltage across the resonant circuit via at least two first switches of the first bridge for a first period substantially equal to half the cycle of the characteristic frequency of the resonant circuit formed, the at least two first switches being in different branches of the first bridge; and (b) connecting the resonant circuit across the second alternating voltage via at least two of the second switches of the second bridge for a second period substantially equal to half the cycle of the characteristic frequency of the resonant circuit formed. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A voltage signal frequency converter comprising:
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a first bridge having a plurality of branches, each branch connected to a respective source voltage signal, and each branch having at least one switch; a second bridge having at least one output conductor and including a plurality of switches connected to the at least one output conductor; a resonant circuit; and controller means for alternately connecting said first bridge and said second bridge to said resonant circuit by controlling the switches of said first and second bridges, said control means closing at least two switches in different branches of the first bridge to thereby connect one of said respective source voltages across said resonant circuit for a first period substantially equal to half the cycle of the characteristic frequency of the resonant circuit, and closing at least two switches in the second bridge to thereby connect the resonant circuit to one of the at least one output conductor for a second period substantially equal to half the cycle of the characteristic frequency of the resonant circuit. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
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Specification