RF power supply
An RF power supply, in particular a plasma supply device, for generating an output power greater than 500 W at an output frequency of at least 3 MHz includes at least one inverter connectable to a DC power supply, which inverter comprises at least one switching element and an output network. An accompanying line connects an electrical component to the inverter by a lead-in of the output network.
1. An RF power supply for generating an output power larger than 500 W at an output frequency of at least 3 MHz, the RF power supply comprising:
at least one inverter that is configured to be connected to a DC power supply and that has at least one switching element, that is supplied with a floating reference potential in operation;
at least one output network coupled to the at least one inverter; and
an accompanying line connecting an electrical component of the inverter at a floating reference potential to an access point at a non-floating potential.
2. The RF power supply of claim 1 , wherein the accompanying line is arranged in a region of an output network line of the output network, which output network line is subject to RF currents in operation.
3. The RF power supply of claim 2 , wherein the accompanying line is configured to accompany a winding of the output network line.
4. The RF power supply of claim 2 , wherein the accompanying line is configured to accompany a primary winding of an output transformer of the output network.
5. The RF power supply of claim 2 , wherein the accompanying line is at least one of twisted with the output network line, configured to run parallel to the output network line, arranged in a bifilar manner relative to the output network line, surrounded or enclosed spatially or in a planar manner by the output network line, and enclosed by a tubular shaped output network line.
6. The RF power supply of claim 2 , wherein the output network line has a planar configuration and the accompanying line is arranged in the center of the output network line.
7. The RF power supply of claim 2 , wherein the output network line and the accompanying line are capacitively connected to each other.
8. The RF power supply of claim 1 , wherein the RF power supply is arranged on a multi-layer circuit board and the accompanying line is arranged on a parallel layer in the region of the output network.
9. The RF power supply of claim 1 , wherein the accompanying line is run through a component of the output transformer for increasing a magnetic field.
10. The RF power supply of claim 1 , wherein the accompanying line is a driver power supply line for feeding a driver supply current of a driver power supply source via the output network line to a driver of the switching element of the inverter.
11. The RF power supply of claim 1 , wherein the access point of the accompanying line is located in the vicinity of a point of a primary winding of an output transformer of the output network that is largely free from time variations of an electrical potential.
12. The RF power supply of claim 1 , wherein the inverter has two half bridges and the access point of the accompanying line is formed in a region of a central tapping of a primary winding of an output transformer.
13. The RF power supply of claim 12 , wherein the output network line and the accompanying line are capacitively coupled by at least one discrete capacitor.
14. The RF power supply of claim 1 , further comprising a common driver power supply source for at least two drivers.
15. The RF power supply of claim 1 , wherein the accompanying line is configured as a control line that connects via the access point directly to a control connector of the switching element of the inverter.
16. The RF power supply of claim 1 , wherein the accompanying line is configured as a measuring line that connects an electrical component, which in operation is on a floating reference potential, via the access point to a measuring device, which in operation is on a non-floating potential.
17. The RF power supply of claim 1 , wherein the inverter is configured as a half bridge and the access point of the accompanying line is located in a region of a point of the output network line at a non-floating potential.
18. A method for operating an RF power supply including a driver power supply for a driver of an inverter, wherein a reference potential of a switching element of the inverter is on a floating potential in operation, the method comprising:
via an accompanying line, feeding a supply current of the driver into an access point of an output network that is at an essentially non-floating potential.
19. The method of claim 18 , wherein the accompanying line is guided in the region of an output network line.
20. The method of claim 18 , wherein the accompanying line and the output network line are at least one of magnetically, electrically, and capacitively coupled.
21. A method for operating an RF power supply including an inverter, a driver of the inverter, and an output network, wherein a switching element of the inverter is on a floating reference potential, the method comprising:
via an accompanying line, feeding a driver output signal for the switching element into an access point of the output network that is at a non-floating potential.
22. The method of claim 21 , wherein the accompanying line is guided in a region of an output network line.