Power supply device for electric discharge machine
AssigneeSodick Co., Ltd.
InventorsYuji Kaneko, Hidetaka Hayashi, Kuniharu Yamada
Life of this patent
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Abstract
A power supply device for an electric discharge machine for supplying power to a work gap (6) formed between a work piece and a tool electrode, includes a parallel circuit in which a first power supply (8), a second power supply (36) and a capacitor (34) are connected in parallel and the second power supply can supply a larger voltage and a smaller current than the first power supply to the work gap. A switching element is connected between the parallel circuit and the work gap for pulsing power from the parallel circuit.
Claims6
A power supply device for an electric discharge machine for supplying power to a work gap formed between a work piece and a tool electrode, said power supply device comprising:
- a parallel circuit having a first power supply, a second power supply and a capacitor connected in parallel, the second power supply supplying a larger voltage and a smaller current than the first power supply to the work gap;
- a switch connected between the parallel circuit and the work gap;
- a gate pulse signal generator for generating a gate pulse signal having an ON time and an OFF time;
- an essentially non-inductive current detector for detecting current flowing through the work gap;
- a comparator for comparing the detected work gap current with a reference value;
- and
- a gate for turning on the switch when the gate pulse signal is ON and the detected work gap current is smaller than the reference value.
A power supply device for an electric discharge machine for supplying power to a work gap formed between a work piece and a tool electrode, said power supply comprising:
- a parallel circuit having a first power supply and a second power supply connected in parallel, the second power supply supplying a larger voltage than the first power supply to the work gap;
- a first switch connected between the parallel circuit and the work gap;
- a second switch connected in series with the second power supply in said parallel circuit;
- a gate pulse signal generator for generating a gate pulse signal having an ON time and an OFF time;
- an essentially non-inductive current detector for detecting current flowing through the work gap;
- a comparator for comparing the detected work gap current with a reference value;
- a gate for turning on the first switch when the gate pulse signal is ON and the detected work gap current is smaller than the reference value;
- wherein the second switch allows current to flow from the second power supply through the work gap for a time period during which the current flowing through the work gap increases to a peak value.
Dependencies are inferred from the claim text.