Protective circuit for a frequency converter
AssigneeDr. Johannes Heidenhain GmbH
InventorsNorbert Huber, Simon Graf
Life of this patent
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Abstract
The voltage of the intermediate circuit of a frequency converter is monitored, while the intermediate circuit is charged via charging resistors. When the voltage has not reached at least a reference voltage during a specific time constant, the charging process is interrupted prematurely. The reference voltage is selected to be considerably lower than the operating voltage of the intermediate circuit. The reference voltage may be less than half of the operating voltage of the intermediate circuit.
Claims12
A protective circuit for a frequency converter, comprising:
- an intermediate-circuit capacitor;
- a voltage monitor device configured to monitor a voltage of the intermediate-circuit capacitor during a charge process;
- and
- an arrangement adapted to end the charge process if a reference voltage substantially less than an operating voltage of the intermediate circuit capacitor is not reached.
A protective circuit for a frequency converter, comprising:
- intermediate-circuit capacitor means;
- means for monitoring a voltage of the intermediate-circuit capacitor means during a charging process;
- and
- means for ending the charging process if a reference voltage substantially less than an operating voltage of the intermediate circuit capacitor means is not reached.
Dependencies are inferred from the claim text.