Electric power conversion systems – Current conversion – With condition responsive means to control the output...
Patent
1997-09-09
1999-03-02
Nguyen, Matthew
Electric power conversion systems
Current conversion
With condition responsive means to control the output...
363132, H02M 744, H02M 75387
Patent
active
058779507
ABSTRACT:
This invention relates to a device for measuring currents used in a converter (1) powered by a DC power source and equipped with six switches (T1, T2, T3, T4, T5, T6) associated with diodes (D1, D2, D3, D4, D5, D6) and controlled by a control circuit (2) and a microcontroller (3), and equipped with current sensors (Su, Sv, Sw) each located between the switch and the diode associated with a lower channel, and secondly the return conductor to the DC power source supplying "direct" signals (Isu, Isv, Isw) in phase with the currents (Ia, Ib, Ic) output from the converter, characterized by the fact that it includes means (A46, A62) of calculating an "indirect" replacement signal (Iai) equal to the sum of two "direct" signals (-Isu and -Isw) and a second "indirect" replacement signal (Ici) equal to the sum of the two "direct" signals (-Isu and -Isw) and means (Cu, Cw) for switching either a "direct" signal (Isu or Isw) or an "indirect" replacement signal (Iai or Ici) so as to send to the microcontroller (3) two signals reconstructed from the two phase currents (Ia* and Ic*), each composed of either the "direct" signal (Isu or Isw) or, during the PWM steps in which the lower branch transistor is not controlled, the "indirect" replacement signal (Iai, Ici).
REFERENCES:
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patent: 4851982 (1989-07-01), Tanahashi
patent: 5307258 (1994-04-01), Schidhauser
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patent: 5663627 (1997-09-01), Ogawa
patent: 5699240 (1997-12-01), Obayashi
Bonsignour Eric
Nguyen Phuoc Vinh T.
Nguyen Matthew
Schneider Electric SA
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