Patent ID: 8796972
Filing Date: 2014-08-05
Classification: G01R,H02P

Abstract:
1. A method for starting an electronic drive circuit for the windings of an electric motor, said drive circuit having input terminals and being a part of a circuit arrangement further including a voltage source having first and second connecting terminals and a system switching element connecting said drive circuit to said voltage source; a control unit connected to said voltage source; a capacitor having a capacitor voltage (U C ) and being connected via said system switching element to said connecting terminals of said voltage source; said capacitor being connected to said input terminals parallel to said drive circuit; and, an operating circuit for said system switching element; the method comprising the steps of: in advance of starting said motor, closing said system switching element for a pregiven time interval and charging said capacitor via said system switching element; causing said operating circuit to open said system switching element after said capacitor is charged thereby disconnecting said capacitor and said drive circuit from said voltage source; after said capacitor is disconnected from said voltage source, causing said control unit to start a test step for said drive circuit; and, during said test step, supplying said drive circuit exclusively from said capacitor voltage (U