Patent ID: 7586071

Claim:
An apparatus for performing a process of embossing, sealing, welding or fusing RF sealable material, the apparatus comprising: a power source including a solid state variable frequency generator for providing a radio frequency output signal at a predetermined power the generator having a control circuit; power components operating below a maximum predetermined power load in electrical communication with the variable frequency generator for transferring power from the generator towards the sealable material; welding components for receiving the transferred power from the power components and transferring the power to the RF sealable material whereby the material is embossed, sealed, welded or fused; a fixed filter in electrical communication between the power components and the welding components; and an automatic impedance tuning device in electrical communication between the power components and the welding components, the tuning device comprising electronically controlled capacitors; wherein the control circuit monitors the electrical state of the apparatus and varies the radio frequency output signal so that: (1) delivery of said predetermined power remains substantially unchanged and (2) said power load in said power components remains below said maximum predetermined power load; and wherein the automatic impedance tuning device electronically measures the electrical state of the apparatus at the beginning of the process and adjusts the capacitors in the tuning device so that maximum power from the variable frequency generator is delivered to the welding components.