Method for operating a Ki system

Patent metadata

Field	Value
Publication number	US-12057709-B2
Application number	US-202218046578-A
Country	US
Kind code	B2
Filing date	Oct 14, 2022
Priority date	Oct 19, 2021
Publication date	Aug 6, 2024
Grant date	Aug 6, 2024

Abstract

A method for operating a system having a device for the wireless transmission of energy to an electrical consumer by means of inductive coupling, and an electrical consumer, wherein the device has: a rectifier for generating a DC voltage from a line voltage, an inverter which is fed from the DC voltage and designed to generate a pulse-width-modulated activation signal, a power coil activated by the pulse-width-modulated activation signal, by means of which an alternating magnetic field can be generated to transmit the energy, a communication device designed to exchange data bi-directionally with the electrical consumer, and a regulator designed to regulate a power output by the inverter to a predetermined setpoint, and wherein the electrical consumer has: a switching device for changing the load impedance of the electrical consumer, and a communication device designed to exchange data bi-directionally with the device, wherein the method comprises the steps: synchronizing the operation of the device and the operation of the electrical consumer in such a way that, during a change in the load impedance of the electrical consumer, a transition frequency and/or a transition duty cycle of the pulse-width-modulated activation signal is/are set in such a way that voltages and/or currents induced in the electrical consumer do not exceed and/or fall below specified threshold values.

First claim

The invention claimed is:

1. A method for operating a system having an electrical consumer ( 200 ) and a device ( 100 ) for wireless transmission of energy to the electrical consumer ( 200 ) by means of inductive coupling,
wherein the device ( 100 ) has:
a rectifier ( 108 ) for generating a DC voltage (U_S) from a line voltage (U_N),
an inverter ( 102 ) which is fed from the DC voltage (U_S) and designed to generate a pulse-width-modulated activation signal (A_S),
a power coil ( 101 ) activated by the pulse-width-modulated activation signal (A_S), by means of which an alternating magnetic field can be generated to transmit the energy,
a communication device ( 111 ) designed to communicate bi-directionally with the electrical consumer ( 200 ), and
a regulator ( 116 ) designed to regulate a power output by the inverter ( 102 ) to a predetermined setpoint, and

wherein the electrical consumer ( 200 ) has:
a switching device ( 203 ) for changing a load impedance of the electrical consumer ( 200 ), and
a communication device ( 206 ) designed to communicate bi-directionally with the device ( 100 ),

wherein the method comprises:
transmitting first data from the electrical consumer ( 200 ) to the device ( 100 ), wherein the first data indicates that the electrical consumer ( 200 ) plans to change its electrical load impedance,
thereafter, transmitting second data from the device ( 100 ) to the electrical consumer ( 100 ), wherein the second data indicates that the first data of the electrical consumer ( 200 ) has been received by the device ( 100 ), and adjusting a transition frequency and/or a transition duty cycle,
thereafter, changing the load impedance of the electrical consumer ( 200 ) and transmitting third data from the electrical consumer ( 200 ) to the device ( 100 ), wherein the third data indicates that the electrical consumer ( 200 ) has changed its load impedance,
thereafter, regulating an electrical power output by the inverter ( 102 ) to a stationary setpoint, and
synchronizing the operation of the device ( 100 ) and the operation of the electrical consumer ( 200 ) in such a way that, during a change in the load impedance of the electrical consumer ( 200 ), the adjusting of the transition frequency and/or the transition duty cycle of the pulse-width-modulated activation signal (A_S) occurs in such a way that a voltage (U_ 1 ) and/or current induced in the electrical consumer ( 200 ) do not exceed and/or fall below specified threshold values.

2. The method as claimed in claim 1 , characterized in that
the regulator ( 116 ) is disabled while the load impedance of the electrical consumer ( 200 ) is changed.

3. The method as claimed in claim 1 , characterized in that
the transition frequency and/or the transition duty cycle is/are set in such a way that the voltage U_ 1 induced in the electrical consumer ( 200 ) remains less than or equal to a nominal voltage of the electrical consumer ( 200 ), irrespective of the load impedance of the electrical consumer ( 200 ).

4. The method as claimed in claim 1 , characterized in that
for coupling factors between the device ( 100 ) and the electrical consumer ( 200 ) of ≤0.45, the transition frequency is set to ≥ 40 kHz, and
for coupling factors between the device ( 100 ) and the electrical consumer ( 200 ) of ≥0.45, the transition frequency is set to ≥ 50 KHz.

5. The method as claimed in claim 1 , characterized in that the transition frequency is zero Hz.

6. The method as claimed in claim 1 , characterized in that
the first data transmitted from the electrical consumer ( 200 ) to the device ( 100 ) additionally includes a desired setpoint, wherein the stationary setpoint is set depending on the desired setpoint.

7. The method as claimed in claim 1 , characterized in that
the first data transmitted from the electrical consumer ( 200 ) to the device ( 100 ) includes additional information identifying a future load impedance.

8. The method as claimed in claim 1 , characterized in that
one or more of: i) the first data, ii) the second data, or (iii) the third data is/are transmitted between the electrical consumer ( 200 ) and the device ( 100 ) in a time range associated with a zero crossing of the line voltage.

9. A system ( 1 ), comprising
a device ( 100 ) for wireless transmission of energy to an electrical consumer ( 200 ) by means of inductive coupling, and
the electrical consumer ( 200 ),
wherein the device ( 100 ) has:
a rectifier ( 108 ) for generating a DC voltage (U_S) from a line voltage (U_N),
an inverter ( 102 ) which is fed from the DC voltage (U_S) and designed to generate a pulse-width-modulated activation signal (A_S),
a power coil ( 101 ) activated by the pulse-width-modulated activation signal (A_S), by means of which an alternating magnetic field can be generated to transmit the energy,
a communication device ( 111 ) designed to communicate bi-directionally with the electrical consumer ( 200 ), and
a regulator ( 116 ) designed to regulate a power output by the inverter ( 102 ) to a predetermined setpoint, and

wherein the electrical consumer ( 200 ) has:
a switching device ( 203 ) for changing a load impedance of the electrical consumer ( 200 ) and
a communication device ( 206 ) designed to communicate bi-directionally with the device ( 100 ), and

wherein the device ( 100 ) and the electrical consumer are designed to carry out a method as claimed in claim 1 .

Assignees

• Ego Elektro Geraetebau Gmbh

Inventors

• Egenter Christian
• Mueller Max-Felix
• Bellm Mathias
• Waechter Ulrich

Classifications

• H02J2207/20

  Charging or discharging characterised by the power electronics converter · CPC title

• H02J50/80

  involving the exchange of data, concerning supply or distribution of electric power, between transmitting devices and receiving devices · CPC title

• H02J50/10 Primary

  using inductive coupling · CPC title

• H02J50/12 Primary

  of the resonant type · CPC title