Modulation method for bridge circuits for the particular...

Details Modulation method for bridge circuits for the particular... Modulation method for bridge circuits for the particular...

2008-07-08

2008-07-08

Masih, Karen (Department: 2837)

Electricity: motive power systems

Positional servo systems

Pulse-width modulated power input to motor

C318S606000, C318S800000, C318S801000

Reexamination Certificate

active

11398056

ABSTRACT:
The invention relates to methods and systems for modulating the supply voltage of an electric load, particularly an electric motor, fed by a bridge circuit, wherein the load is switched as a function of a predetermined setpoint value for the input current or the input power by means of power electronics to an intermediate circuit voltage. A modulation method is disclosed in which, instead of the winding current (or the winding currents in the case of multi-strand motors), the intermediate circuit current or the input power of the motor is used as the actual value for regulation. The switch-on times for the modulation of the motor voltage are predetermined at a set frequency by a controller, such as a microcontroller or a timer. The switch-off times are determined such that the average value of the intermediate circuit current corresponds to a predetermined setpoint value.

REFERENCES:
patent: 5363208 (1994-11-01), Ogino et al.

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