Method for operating a ki system

Patent metadata

Field	Value
Publication number	US-2023121821-A1
Application number	US-202218046578-A
Country	US
Kind code	A1
Filing date	Oct 14, 2022
Priority date	Oct 19, 2021
Publication date	Apr 20, 2023
Grant date	—

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

1 . A method for operating a system having a device ( 100 ) for the wireless transmission of energy to an electrical consumer ( 200 ) by means of inductive coupling, and an 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 exchange data 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 the load impedance of the electrical consumer ( 200 ), and
a communication device ( 206 ) designed to exchange data bi-directionally with the device ( 100 ),
wherein the method comprises the steps:
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 ), a transition frequency and/or a transition duty cycle of the pulse-width-modulated activation signal (A_S) is/are set in such a way that voltages (U_1) and/or currents 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 a 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 by the steps
a) transmitting data from the electrical consumer ( 200 ) to the device ( 100 ), wherein the data indicates that the electrical consumer ( 200 ) plans to change its electrical load impedance, b) thereafter, transmitting data from the device ( 100 ) to the electrical consumer ( 100 ), wherein the data indicates that the data of the electrical consumer ( 200 ) has been received by the device ( 100 ), and adjusting the transition frequency and/or the transition duty cycle, c) thereafter, changing the load impedance of the electrical consumer ( 200 ) and transmitting data from the electrical consumer ( 200 ) to the device ( 100 ), wherein the data indicates that the electrical consumer ( 200 ) has changed its load impedance, and d) thereafter, regulating an electrical power output by the inverter ( 102 ) to a stationary setpoint.

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

8 . The method as claimed in claim 6 , characterized in that
in step a) the data transmitted from the electrical consumer ( 200 ) to the device ( 100 ) includes additional information identifying the future load impedance.

9 . The method as claimed in claim 6 , characterized in that
data is transmitted between the electrical consumer ( 200 ) and the device ( 100 ) in a time range around a zero crossing of the line voltage.

10 . A system ( 1 ), comprising
a device ( 100 ) for the wireless transmission of energy to an electrical consumer ( 200 ) by means of inductive coupling, and an 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 exchange data 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 the load impedance of the electrical consumer ( 200 ), and a communication device ( 206 ) designed to exchange data bi-directionally with the device ( 100 ),
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

• H02J50/10 Primary

  using inductive coupling · CPC title

• H02J50/80

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

• H02J50/12 Primary

  of the resonant type · CPC title

• H02J2207/20

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