Power supply apparatus for arc-utilizing equipment
First Claim
1. A power supply apparatus for arc-utilizing equipment, comprising:
- first converter means for receiving and converting an AC voltage to a DC voltage;
inverter means for converting said DC voltage from said first converter means to a high-frequency voltage;
a voltage-transformer having primary and secondary windings, said transformer receiving said high frequency voltage from said inverter means and inducing a voltage-transformed high-frequency voltage in said secondary winding;
second converter means for converting said voltage-transformed high-frequency voltage from said voltage-transformer to a DC voltage;
two output terminals between which an output voltage of said second converter means is developed, said two output terminals being adapted for connection to a torch electrode of a torch of said arc-utilizing equipment and a workpiece to be processed by said equipment, respectively;
high-frequency voltage generating means including a coupling coil having its one end connected to one of said two output terminals;
a bypass capacitor connected between the other end of said coupling coil and the other one of said two output terminals; and
control means for controlling said high-frequency voltage generating means and said inverter means;
said bypass capacitor being connected directly between said other output terminal and said other end of said coupling coil.
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Accused Products
Abstract
A power supply apparatus for arc-utilizing equipment includes a first converter for converting a received AC voltage to a DC voltage.
An inverter converts the DC voltage to a high-frequency voltage, which is applied to a voltage-transformer with primary and second windings. A voltage-transformed high-frequency voltage induced in the secondary winding is converted to a DC voltage in a second converter, which is developed between two output terminals. The respective ones of the two output terminals are connected to a torch electrode of the arc-utilizing equipment and a workpiece. A bypass capacitor and a high-frequency voltage generator circuit are serially connected between the two output terminals. A control circuit controls the high-frequency voltage generator circuit and the inverter circuit. The bypass capacitor is connected directly between one of the two output terminals and the high-frequency voltage generator circuit.
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Citations
7 Claims
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1. A power supply apparatus for arc-utilizing equipment, comprising:
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first converter means for receiving and converting an AC voltage to a DC voltage; inverter means for converting said DC voltage from said first converter means to a high-frequency voltage; a voltage-transformer having primary and secondary windings, said transformer receiving said high frequency voltage from said inverter means and inducing a voltage-transformed high-frequency voltage in said secondary winding; second converter means for converting said voltage-transformed high-frequency voltage from said voltage-transformer to a DC voltage; two output terminals between which an output voltage of said second converter means is developed, said two output terminals being adapted for connection to a torch electrode of a torch of said arc-utilizing equipment and a workpiece to be processed by said equipment, respectively; high-frequency voltage generating means including a coupling coil having its one end connected to one of said two output terminals; a bypass capacitor connected between the other end of said coupling coil and the other one of said two output terminals; and control means for controlling said high-frequency voltage generating means and said inverter means; said bypass capacitor being connected directly between said other output terminal and said other end of said coupling coil.
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2. A power supply apparatus for arc-utilizing equipment, comprising:
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first converter means for receiving and converting an AC voltage to a DC voltage; inverter means for converting said DC voltage from said first converter means to a high-frequency voltage; a voltage-transformer having primary and secondary windings, said transformer receiving said high-frequency voltage from said inverter means and inducing a voltage-transformed high-frequency voltage in said secondary winding; second converter means for converting said voltage-transformed high-frequency voltage from said voltage-transformer to a DC voltage; two output terminals between which an output voltage of said second converter means is developed, said two output terminals being adapted for connection to a torch electrode of a torch of said arc-utilizing equipment and a workpiece to be processed by said equipment, respectively; high-frequency voltage generating means having its one end connected to one of said two output terminals; a first bypass capacitor directly connected between the other end of said high-frequency voltage generating means and the other one of said two output terminals; control means for controlling said high-frequency voltage generating means and said inverter means; and a circuit including two serially connected capacitors, said circuit being connected in parallel with said first bypass capacitor, between said other end of said high-frequency voltage generating means and said other output terminal, the junction between said two serially connected capacitors being grounded. - View Dependent Claims (3)
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4. A power supply apparatus for arc-utilizing equipment, comprising:
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first converter means for receiving and converting an AC voltage to a DC voltage; inverter means for converting said DC voltage from said first converter means to a high-frequency voltage; a voltage-transformer having primary and secondary windings, said transformer receiving said high-frequency voltage from said inverter means and inducing a voltage-transformed high-frequency voltage in said secondary winding; second converter means for converting said voltage-transformed high-frequency voltage from said secondary winding of said voltage-transformer to a DC voltage; two output terminals between which an output voltage of said second converter means is developed, said two output terminals being adapted for connection to a torch electrode of a torch of said arc-utilizing equipment and a workpiece to be processed by said equipment, respectively; high-frequency voltage generating means having its one end connected to one of said two output terminals; a first bypass capacitor directly connected between the other end of said high-frequency voltage generating means and the other one of said two output terminals; control means for controlling said high-frequency voltage generating means and said inverter means; two switching terminals connected to said control means and adapted to receive a turn-on command signal from a switch associated with said torch for turning on said high-frequency voltage generating means; and a second bypass capacitor connected directly between said two switching terminals. - View Dependent Claims (5, 6, 7)
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Specification