System and method for tuning an induction circuit

Patent metadata

Field	Value
Publication number	US-10993292-B2
Application number	US-201715790414-A
Country	US
Kind code	B2
Filing date	Oct 23, 2017
Priority date	Oct 23, 2017
Publication date	Apr 27, 2021
Grant date	Apr 27, 2021

Abstract

The present disclosure relates to an induction cooktop. The induction cooktop comprises a ceramic cooking surface in connection with a housing. A plurality of inductors is disposed in the housing and each of the inductors is in communication with an automatic control system. The automatic control system is configured to check for the presence of a cooking pan on the cooktop in order to prevent the inductors from activating in the absence of the cooking pan. The automatic control system is activated upon receiving an activation command.

First claim

What is claimed is:

1. An induction cooking system, comprising:
a power supply bus;
a plurality of resonant inverters in connection with the power supply bus, each comprising a dedicated resonant capacitor;
at least one bus capacitor in connection with each of the dedicated resonant capacitors and a ground;
a plurality of inductors configured to generate an electromagnetic field in connection with the plurality of resonant inverters;
at least one switch operable to control a plurality of switch configurations comprising a first configuration and a second configuration; and
a tuning capacitor in connection with each of the dedicated resonant capacitors via the at least one switch, wherein the at least one switch is configured to selectively connect the tuning capacitor in parallel with one of the dedicated resonant capacitors in the first configuration and the second configuration.

2. The induction cooking system according to claim 1 , wherein the switch is conductively connected to the tuning capacitor and configured to selectively connect to each of the dedicated resonant capacitors of the resonant inverters.

3. The induction cooking system according to claim 1 , wherein the resonant inverters each comprise a switching device in connection with each of the dedicated resonant capacitors and the inductors.

4. The induction cooking system according to claim 1 , wherein the at least one switch comprises a plurality of switches.

5. The induction cooking system according to claim 4 , wherein the plurality of switches comprises a first switch configured to conductively connect selectively to each of the dedicated resonant capacitors of the resonant inverters.

6. The induction cooking system according to claim 5 , wherein the plurality of switches comprises a second switch arranged in series with the tuning capacitor, wherein the second switch is configured to selectively connect or disconnect the tuning capacitor from the resonant inverters.

7. The induction cooking system according to claim 6 , wherein the second switch is further configured to connect the tuning capacitor in parallel with the bus capacitor when the tuning capacitor is disconnected from the resonant inverters.

8. An induction cooking system, comprising:
a power supply bus;
a first resonant inverter, comprising:
a first dedicated resonant capacitor in connection with the power supply bus; and
a first induction coil connected in parallel with the first dedicated resonant capacitor;

a second resonant inverter, comprising:
a second dedicated resonant capacitor in connection with the power supply bus; and
a second induction coil connected in parallel with the second dedicated resonant capacitor;

at least one switch operable to control a plurality of switch configurations comprising a first configuration and a second configuration, wherein the at least one switch is configured to selectively connect the first dedicated resonant capacitor in parallel with the tuning capacitor in the first configuration and the second dedicated resonant capacitor in parallel with the tuning capacitor in the second configuration; and
a tuning capacitor in connection with the first dedicated resonant capacitor and the second dedicated resonant capacitor via the at least one switch, wherein the at least one switch is configured to selectively connect the tuning capacitor in parallel to either the first dedicated resonant capacitor or the second dedicated resonant capacitor in each of the plurality of switch configurations.

9. The induction cooking system according to claim 8 , further comprising:
at least one bus capacitor in conductive connection with the first dedicated resonant capacitor, the second dedicated resonant capacitor and a ground.

10. The induction cooking system according to claim 8 , wherein the at least one switch comprises a plurality of switches comprising a second switch disposed between the first switch and the tuning capacitor, wherein the second switch is configured to selectively disconnect the first switch from the resonant inverters.

11. An induction cooking system, comprising:
a power supply bus;
a plurality of resonant inverters in connection with the power supply bus, each comprising a dedicated resonant capacitor, the plurality of resonant inverters comprising a first resonant inverter comprising a first dedicated capacitor and a second resonant inverter comprising a second dedicated capacitor;
a plurality of inductors configured to generate an electromagnetic field in connection with the plurality of resonant inverters;
a switch operable to control a plurality of switch configurations comprising a first configuration and a second configuration; and
a tuning capacitor in connection with each of the dedicated resonant capacitors via the switch, wherein the switch is configured to connect the tuning capacitor in parallel with either the first dedicated capacitor in the first configuration or the second dedicated capacitor in the second configuration.

12. The induction cooking system according to claim 11 , wherein the switch is conductively connected to the tuning capacitor and configured to selectively connect to each of the dedicated resonant capacitors of the resonant inverters.

13. The induction cooking system according to claim 11 , further comprising:
at least one bus capacitor in connection with each of the dedicated resonant capacitors and a ground.

14. The induction cooking system according to claim 11 , wherein the resonant inverters each comprise a switching device in connection with each of the dedicated resonant capacitors and the inductors.

Assignees

• Whirlpool Co

Inventors

• Baldo Salvatore
• Moroni Stefano
• Parachini Davide
• Pastore Cristiano Vito
• Prestigiacomo Gioacchino

Classifications

• H05B6/062 Primary

  for cooking plates or the like · CPC title

• H05B6/08

  using compensating or balancing arrangements · CPC title

• H05B6/1209

  induction cooking plates or the like and devices to be used in combination with them · CPC title

• H05B6/065 Primary

  using coordinated control of multiple induction coils · CPC title