Control system for voltage-source pulse width modulation step-up

Details Control system for voltage-source pulse width modulation step-up Control system for voltage-source pulse width modulation step-up

1989-08-02

1990-06-12

Beha, Jr., William H.

Electric power conversion systems

Current conversion

With condition responsive means to control the output...

318812, 363 37, H02M 7797, H02M 7458

Patent

active

049338285

ABSTRACT:
In a voltage-source PWM step-up converter connected to an a.c. power supply through a reactor, even in the case where a reactor voltage drop V.sub.L changes in dependence upon a load current, it is required to compensate such a change to control a d.c. voltage so that it is equal to a predetermined value. Since this reactor voltage drop V.sub.L has a phase shift of substantially 90 degrees with respect to an a.c. power supply voltage, a control signal for compensating such a phase shift, resulting in the possibility that is exceeds above a linear control range of the control circuit to reach the saturation range. In view of this, in accordance with this invention, control signal means for compensating a reactor voltage drop V.sub.L is provided in the control circuit, thereby making it possible to perform a stable control to provide a stable d.c. output.

REFERENCES:
patent: 4625272 (1986-11-01), Okuyama et al.

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