Method for starting an electronic drive circuit of an electric motor and circuit arrangement therefor

摘要

The invention relates to a method for starting an electronic drive circuit for the windings of an electric motor. A control unit, which is connected to a voltage source, is provided as well as a capacitor connected via a system switch element to the connecting terminals of the voltage source. The capacitor is connected across the input terminals parallel to the drive circuit. An operating circuit controls the system switch element. In order to start the motor, the operating circuit closes the system switch element and charges the capacitor and after the charging of the capacitor, opens the system switch element again. A test step is then started by the control unit, the drive circuit being supplied exclusively by the capacitor voltage (UC) during the test step.

主权项

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 (UC) 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 (UC) of said capacitor disconnected from said voltage source with said capacitor being configured and charged so that said capacitor can store the energy needed for said test step and make said energy available during said test step.