Electricity: motive power systems – Induction motor systems – Primary circuit control
Patent
1998-01-26
1999-11-02
Ip, Paul
Electricity: motive power systems
Induction motor systems
Primary circuit control
318139, 318254, H02P 706, H03K 1706
Patent
active
059777435
ABSTRACT:
In order to provide a control device for controlling an inductive load connected to an output, comprising a control circuit which generates a pulse duration modulation signal, an FET final stage switch for connecting a supply current for the load, a switch-on stage and a switch-off stage for the switching on and off of a gate voltage of the final stage switch, and a gate voltage supply for the switch-on stage, with which a reliable connection of the FET final stage switch can be achieved with means which are as simple as possible it is suggested that the gate voltage supply have a charge pump circuit, comprising a diode located between a plus connection and a center tap in forward direction and a capacitor located between the center tap and a minus connection, that the center tap be connected to the switch-on stage and that a potential at the minus connection of the charge pump circuit alter in accordance with a potential at the output and thus the capacitor supply at the center tap a gate supply voltage which corresponds at least to a voltage at the connection of the final stage switch on the supply side.
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Ip Paul
Lipsitz Barry R.
Stribel GmbH
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