The present disclosure provides a method for controlling a power of an electromagnetic cooking appliance and an electromagnetic cooking appliance. The electromagnetic cooking appliance includes a first coil disk and a second coil disk. Each of the first coil disk and the second coil disk corresponds to an independent resonance circuit. After obtaining a target power of the electromagnetic cooking appliance, a heating period of the electromagnetic cooking appliance is determined based on the target power, each heating period including at least one first heating time period and at least one second heating time period. The first coil disk is controlled to heat in the first heating time period, and the second coil disk to heat in the second heating time period, such that the first coil disk and the second coil disk are heated alternately to reduce an interference of harmonic current and voltage flicker.

The present disclosure provides a method for controlling a power of an electromagnetic cooking appliance and an electromagnetic cooking appliance. The electromagnetic cooking appliance includes a first coil disk and a second coil disk. Each of the first coil disk and the second coil disk corresponds to an independent resonance circuit. After obtaining a target power of the electromagnetic cooking appliance, a heating period of the electromagnetic cooking appliance is determined based on the target power, each heating period including at least one first heating time period and at least one second heating time period. The first coil disk is controlled to heat in the first heating time period, and the second coil disk to heat in the second heating time period, such that the first coil disk and the second coil disk are heated alternately to reduce an interference of harmonic current and voltage flicker.

Methods and apparatus to reduce biological carryover using induction heating are disclosed herein. An example method includes washing an aspiration and dispense device. The example method includes generating an alternating electromagnetic field and introducing the aspiration and dispense device into the alternating electromagnetic field. The example method includes inductively heating the aspiration and dispense device with the alternating electromagnetic field. In the example method, the washing is to occur in concert with the heating.

Methods and apparatus to reduce biological carryover using induction heating are disclosed herein. An example method includes washing an aspiration and dispense device. The example method includes generating an alternating electromagnetic field and introducing the aspiration and dispense device into the alternating electromagnetic field. The example method includes inductively heating the aspiration and dispense device with the alternating electromagnetic field. In the example method, the washing is to occur in concert with the heating.

An induction heating apparatus may include first/second working coils, first/second inverter circuits and a controller. When a user changes a required power value of a first working coil or a second working coil to a third required power value, a controller determines a third driving frequency corresponding to the third required power value. The controller according to one embodiment calculates a difference value between a driving frequency of the working coil, the required power value of which is not changed, and the third driving frequency, and compares the calculated difference value with a predetermined first reference range. When the calculated difference value is included in the first reference range, the controller changes an operation mode of a first inverter circuit from a full bridge mode to a frequency doubler mode, and changes an output power value of the working coil the required power value of which is changed to the third required power value.

An induction heating apparatus may include first/second working coils, first/second inverter circuits and a controller. When a user changes a required power value of a first working coil or a second working coil to a third required power value, a controller determines a third driving frequency corresponding to the third required power value. The controller according to one embodiment calculates a difference value between a driving frequency of the working coil, the required power value of which is not changed, and the third driving frequency, and compares the calculated difference value with a predetermined first reference range. When the calculated difference value is included in the first reference range, the controller changes an operation mode of a first inverter circuit from a full bridge mode to a frequency doubler mode, and changes an output power value of the working coil the required power value of which is changed to the third required power value.

In an aspect, data representative of an electrical value is received and a target value for an inductive load based on the electrical value is accessed from memory of the controller. A target value for an inductive load can be accessed based on the electrical value. A transfer function based algorithm can be implemented for determining a set point value using the electrical value the set point value can be applied on a triode for alternating current (TRIAC). Operation of the inductive load to the target power responsive to the applying of the set point value on the TRIAC can be adjusted. The operation of the inductive load at the target power causes operation of the inductive load at the target value.

In an aspect, data representative of an electrical value is received and a target value for an inductive load based on the electrical value is accessed from memory of the controller. A target value for an inductive load can be accessed based on the electrical value. A transfer function based algorithm can be implemented for determining a set point value using the electrical value the set point value can be applied on a triode for alternating current (TRIAC). Operation of the inductive load to the target power responsive to the applying of the set point value on the TRIAC can be adjusted. The operation of the inductive load at the target power causes operation of the inductive load at the target value.

An example system for controlling heating of a workpiece includes: an interface configured to receive a target temperature (T.sub.T) for the workpiece; a processor configured to: select a current temperature (T.sub.S) for the workpiece based on monitoring one or more temperature sensors; and set a control temperature (T.sub.C) based on the received target temperature and T.sub.S; and a control system configured to: control heating of the workpiece via a heating device until the workpiece reaches T.sub.C as measured by at least one of the one or more temperature sensors, and controlling the heating device to stop heating the workpiece in response to the workpiece reaching T.sub.C; wherein: the processor is configured to characterize a temperature ramp rate based on a measured temperature overshoot at the workpiece after turning off the heating device; and the control system is configured to control heating of the workpiece to T.sub.T by controlling the heating device based on the temperature ramp rate.

An example system for controlling heating of a workpiece includes: an interface configured to receive a target temperature (T.sub.T) for the workpiece; a processor configured to: select a current temperature (T.sub.S) for the workpiece based on monitoring one or more temperature sensors; and set a control temperature (T.sub.C) based on the received target temperature and T.sub.S; and a control system configured to: control heating of the workpiece via a heating device until the workpiece reaches T.sub.C as measured by at least one of the one or more temperature sensors, and controlling the heating device to stop heating the workpiece in response to the workpiece reaching T.sub.C; wherein: the processor is configured to characterize a temperature ramp rate based on a measured temperature overshoot at the workpiece after turning off the heating device; and the control system is configured to control heating of the workpiece to T.sub.T by controlling the heating device based on the temperature ramp rate.