Dual-frequency power-supply apparatus, high-frequency heating apparatus, and high-frequency quenching apparatus
Provided are a dual-frequency power-supply apparatus, a high-frequency heating apparatus, and a high-frequency quenching apparatus having a high durability. A dual-frequency power-supply apparatus 1 includes a power supply 10 that alternately outputs a low-frequency current and a high-frequency current. The power supply 10 has an inverter 30 that converts a direct current into the low-frequency current and the high-frequency current and a controller 40 that controls the inverter 30 . The controller 40 repeats, in this order, a first output period T 11 in which the low-frequency current is output, a first intermission T 12 in which output is stopped, a second output period T 13 in which the high-frequency current is output, and a second intermission T 14 in which output is stopped. The controller 40 sets the length of the first intermission T 12 longer than a time Ta until the polarity of the output voltage of the power supply 10 is reversed fourthly after transition from the first output period T 11 to the first intermission T 12.
1 . A dual-frequency power-supply apparatus comprising:
a power supply that alternately outputs a first alternating current with a first frequency and a second alternating current with a second frequency higher than the first frequency;
a first matching box that has a first matching transformer and is capable of receiving an output current of the power supply to output the first alternating current; and
a second matching box that has a second matching transformer and is capable of receiving the output current of the power supply to output the second alternating current,
wherein the power supply has
an inverter that converts a direct current into the first alternating current and the second alternating current, and
a controller that controls the inverter,
the controller repeats, in this order,
a first output period in which the first alternating current is output,
a first intermission in which output is stopped,
a second output period in which the second alternating current is output, and
a second intermission in which output is stopped, and
a length of the first intermission is set longer than a time until a polarity of an output voltage of the power supply is reversed fourthly after transition from the first output period to the first intermission.
2 . The dual-frequency power-supply apparatus according to claim 1 , wherein
the controller sets the length of the first intermission longer than a time until the polarity of the output voltage of the power supply is reversed fifthly after transition from the first output period to the first intermission.
3 . The dual-frequency power-supply apparatus according to claim 2 , wherein
the controller sets a length of the second intermission longer than a time until the polarity of the output voltage of the power supply is reversed fourthly after transition from the second output period to the second intermission.
4 . The dual-frequency power-supply apparatus according to claim 1 , wherein
the controller sets a length of the second intermission longer than a time until the polarity of the output voltage of the power supply is reversed fourthly after transition from the second output period to the second intermission.
5 . The dual-frequency power-supply apparatus according to claim 4 , wherein
the controller sets the length of the second intermission longer than a time until the polarity of the output voltage of the power supply is reversed fifthly after transition from the second output period to the second intermission.
6 . The dual-frequency power-supply apparatus according to claim 1 , wherein
the power supply further has a converter that converts an alternating current into the direct current to output a high-potential-side potential and a low-potential-side potential, and
the inverter has
a first switching element that is connected to between the high-potential-side potential and a first output terminal of the power supply,
a second switching element that is connected to between the low-potential-side potential and the first output terminal,
a third switching element that is connected to between the high-potential-side potential and a second output terminal of the power supply, and
a fourth switching element that is connected to between the low-potential-side potential and the second output terminal.
7 . A high-frequency heating apparatus comprising:
the dual-frequency power-supply apparatus according to claim 1 ; and
a coil that receives the first alternating current and the second alternating current from the dual-frequency power-supply apparatus.
8 . A high-frequency quenching apparatus comprising:
the high-frequency heating apparatus according to claim 7 ; and
a cooling apparatus that cools a workpiece heated by the high-frequency heating apparatus.