Motor driver having a booster circuit and an inverter both contr

Details Motor driver having a booster circuit and an inverter both contr Motor driver having a booster circuit and an inverter both contr

1998-09-30

2000-05-09

Salata, Jonathan

Electricity: motive power systems

Induction motor systems

Primary circuit control

318811, H02P 700

Patent

active

060608595

ABSTRACT:
A motor driver includes an inverter having at least one arm including two series-connected switching elements and converting a direct current to an alternating current to supply the alternating current to an electric motor, a booster circuit connected between the inverter and a DC power supply and including a reactor, a switching element and a reverse-flow preventing diode, the booster circuit supplying the direct current from the DC power supply to the inverter, a current detector for detecting current flowing into the booster circuit, a speed detector for detecting a rotational speed of the motor, and a controller for comparing a speed value detected by the speed detector with a set speed value, thereby determining a command value. The controller controls the inverter on the basis of the command value by pulse width modulation and further controls the booster circuit pulse width modulation so that the booster circuit executes a voltage boosting operation and the current detector so that the detected current value does not exceed an upper limit value.

REFERENCES:
patent: 5208518 (1993-05-01), Grapenthin et al.
patent: 5481166 (1996-01-01), Moreira
patent: 5589743 (1996-12-01), King
patent: 5710699 (1998-01-01), King et al.
patent: 5780980 (1998-07-01), Naito

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