DEVICE AND METHOD FOR OPERATING AN IMPEDANCE-VARIABLE LOAD AT THE PLANAR TRANSFORMER IN HIGH-FREQUENCY OPERATION I

Abstract

The invention relates to a method for operating a variable impedance load on a device, consisting of a planar transformer, consisting of at least a primary and a secondary side, which can be operated as an input or output side, comprising mapping an image of a virtual RF ground at the point of symmetry of one of the secondary sides to a first impedance.

Claims

1. A method for operating a variable impedance load on a planar transformer, consisting of at least a primary and a secondary side, which can be operated as an input or output side, comprising mapping a virtual RF ground at the point of symmetry of one of the secondary sides to a first impedance.

2. The method of claim 1, further comprising selecting a distance to a point of symmetry along one of the secondary sides to the output of the secondary side equal to an odd (or even) multiple of a quarter of a wavelength of a desired harmonic; and/or terminating the output of the secondary side with an open circuit (or short circuit).

3. The method for operating a planar transformer, consisting of a primary and a secondary side, wherein the primary side has at least a first coil and the secondary side has at least a second coil, which second coil is constructed symmetrically and has a point of symmetry and a differential output with two branches, which second coil between the point of symmetry and a first branch of the differential output has a distributed inductance and a distributed capacitance to the first coil, comprising: Selecting a resonance frequency between distributed inductance and distributed capacitance which is equal to a multiple of a preferred operating frequency.

4. The method for operating a planar transformer consisting of a primary and a secondary side, wherein the primary side has at least a first coil and the secondary side has at least a second coil, which second coil is constructed symmetrically and has a virtual radio-frequency ground at the point of symmetry when the planar transformer is operating in differential mode, comprising: Selecting an electrical length of the secondary coil less than half the wavelength at a preferred operating frequency and equal to an integer multiple of an integer fraction of half the wavelength at the preferred operating frequency.

5. The method for operating a planar transformer, having a preferred operating frequency and consisting of a primary and a secondary side, which primary side has an input with a first input impedance at the preferred operating frequency and which secondary side has an output with a first output impedance at the preferred operating frequency, with a first source impedance and a first load impedance, wherein at the preferred operating frequency the first source impedance is the complex conjugate of the first load impedance of the input impedance, when the output is terminated, and the first load impedance is the complex conjugate of the first source impedance of the output impedance, when the input is terminated, wherein the primary side has at least a first coil and the secondary side has at least a second coil, which second coil is constructed symmetrically and has a virtual radio-frequency ground at the point of symmetry when the planar transformer is operating in differential mode, comprising: Selecting an electrical length of the secondary coil less than half the wavelength at the operating frequency and equal to an integer multiple of an integer fraction of half the wavelength at the operating frequency.

6. The method according to claim 1, characterized in that the planar transformer is operated in radio-frequency operation.

7. The method according to claim 6, characterized in that the radio-frequency operation is f10 MHz.

8. The method according to claim 6, characterized in that the radio-frequency operation is 50 kHzf10 MHz.

9. Planar transformer, having at least a primary and a secondary side, which can be operated as an input or output side, and a controller, wherein the controller has a programming which has the steps according to claim 1.

10. Planar transformer, having a preferred operating frequency and consisting of a primary and a secondary side, wherein the primary side has at least a first coil and the secondary side has at least a second coil, which second coil is constructed symmetrically and has a virtual radio-frequency ground at the point of symmetry when the planar transformer is operating in differential mode, characterized in that an electrical length of the secondary coil is less than half the wavelength at the operating frequency and equal to an integer multiple of an integer fraction of half the wavelength at the operating frequency.

11. Planar transformer, having a preferred operating frequency and consisting of a primary and a secondary side, wherein the primary side has at least a first coil and the secondary side has at least a second coil, which second coil is constructed symmetrically and has a point of symmetry and a differential output with two branches, which second coil between the point of symmetry and a first branch of the differential output has a distributed inductance and a distributed capacitance to the first coil, characterized in that a resonance frequency between the distributed inductance and the distributed capacitance is equal to a multiple of the preferred operating frequency.

12. Planar transformer, having a preferred operating frequency and consisting of a primary and a secondary side, which primary side has an input with a first input impedance at the preferred operating frequency and which secondary side has an output with a first output impedance at the preferred operating frequency, with a first source impedance and a first load impedance, wherein at the preferred operating frequency the first source impedance is the complex conjugate of the first load impedance of the input impedance, when the output is terminated, and the first load impedance is the complex conjugate of the first source impedance of the output impedance, when the input is terminated, wherein the primary side has at least a first coil and the secondary side has at least a second coil, which second coil is constructed symmetrically and has a virtual radio-frequency ground at the point of symmetry when the planar transformer is operating in differential mode, characterized in that an electrical length of the secondary coil is less than half the wavelength at the operating frequency and equal to an integer multiple of an integer fraction of half the wavelength at the operating frequency.

13. Planar transformer according to claim 10, characterized in that they have a controller, the controller having a programming which has the steps according to one of the preceding claims.

Description

BRIEF DESCRIPTION OF THE FIGURES

[0058] FIG. 1 device according to the inventiona planar transformer

DETAILED DESCRIPTION OF THE FIGURES

[0059] FIG. 1 shows a device according to the invention, which can carry out a method 100 according to the invention. The device 10 consists of a planar transformer 10. The radio-frequency planar transformer 10, with a variable number of windings in the secondary coil, can conventionally consist of two layers, wherein a first layer can be the primary side and the other layer, which for illustration is arranged parallel to the first layer, can be the secondary side. The planar transformer in FIG. 1 has more than just a secondary coil. The planar transformer in FIG. 1 according to the invention contains a primary side 11 (thick outer line) which, as in a sandwich arrangement, is arranged centrally between two secondary sides 12, 12 (thin line, thin dashed line). Half of the windings of the secondary coil 12 are above, the other half 12 below the primary coil 11. The two secondary coils 12, 12 have winding directions which are opposite to each other. In the middle, where the windings of the secondary coils are also linked, there is a virtual ground. When viewed from above, both halves appear to have winding senses which are opposite to each other; this must be so because in one half the current flows from the inside out and the other half from the outside in, but the (partial) voltages that are induced in both halves should add up instead of canceling each other out.

LIST OF THE REFERENCE SYMBOLS USED

[0060] 10 device according to the inventionplanar transformer

[0061] 11 primary coil of the planar transformer

[0062] 12 a secondary coil of the planar transformer (above)

[0063] 12 symmetrical secondary coil of the planar transformer (below)

[0064] 100 method according to the invention