Primary assembly for use in a wireless power transmission system, positioning system, and method of determining a distance between a primary assembly and a secondary assembly

A method for determining a distance between a primary assembly of a wireless power transmission system and a secondary assembly of the wireless power transmission system, the method comprising:

• transmitting a first signal from a circuit component of the secondary assembly;
• receiving the first signal with a first antenna of the primary assembly;
• receiving the first signal with a second antenna of the primary assembly;
• receiving the first signal with a third antenna of the primary assembly;
• determining a first distance between the circuit component of the secondary assembly and the first antenna by evaluating a signal strength of the first signal at a position of the first antenna;
• determining a second distance between the circuit component of the secondary assembly and the second antenna by evaluating the signal strength of the first signal at a position of the second antenna;
• determining a third distance between the circuit component of the secondary assembly and the third antenna by evaluating the signal strength of the first signal at a position of the third antenna;
• determining a position and an orientation of a secondary coil based on the first and second distances and an angle of two directions;
• and
• determining the distance between the primary assembly and the secondary assembly by evaluating the first distance, the second distance and the third distance.

A primary assembly for a wireless power transmission system, the primary assembly comprising:

• a first antenna;
• a second antenna;
• a first rectifier;
• a second rectifier;
• and
• an evaluation circuit,
• wherein the first antenna is configured to determine a first distance between the first antenna and a circuit component of a secondary assembly for the wireless power transmission system,
• wherein the second antenna is configured to determine a second distance between the second antenna and the circuit component of the secondary assembly,
• wherein the first rectifier is electrically connected to the first antenna and to the evaluation circuit,
• wherein the second rectifier is electrically connected to the second antenna and to the evaluation circuit, and
• wherein the first and second rectifiers are configured to transmit a first signal and a second signal to the evaluation circuit.