Induction Cooktop Inverter Control Synchronization
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Solution Overview
Problem
Conventional induction hob control methods can induce noise pollution due to periodic modifications of the inverter device control at fixed instants relative to the AC supply voltage zero crossings.
Innovation Solution
The method involves modifying the control of the inverter device when the instantaneous value of the rectified and filtered supply voltage is between the periodic minimum and 20% more than the minimum, and synchronizing this modification with a predetermined delay relative to the zero crossings of the alternating voltage, using a control means that measures the instantaneous voltage level to optimize power delivery and reduce noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the control of the inverter device is modified at fixed instants relative to AC supply voltage zero crossings, then the power delivery control is simplified and synchronized, but noise pollution is generated during control modifications
Solution Approach 1:
The control modification is performed in advance at the voltage minimum point rather than at zero crossing, preparing the system state before the actual power delivery phase begins. This preliminary timing avoids the high dv/dt region and prevents noise generation while maintaining control synchronization.
Solution Approach 2:
The invention changes the timing parameter of control modification from fixed zero-crossing alignment to dynamic voltage-minimum alignment. By monitoring the rectified and filtered voltage and identifying its minimum point, the control system adapts the modification timing to match the optimal electrical state, thereby eliminating noise while preserving synchronization capabilities.
2Object-generated harmful factors
If the control modification is performed at voltage minima, then noise pollution is reduced or eliminated, but the control system complexity increases due to voltage monitoring requirements
Solution Approach 1:
The control system uses its own existing voltage monitoring infrastructure to identify the minimum point of the rectified and filtered voltage. Rather than requiring external or additional complex sensing systems, the inverter's inherent voltage measurement capabilities are leveraged to determine the optimal control modification timing, thereby minimizing added complexity.
Solution Approach 2:
The control system continuously monitors the rectified and filtered voltage waveform and uses this feedback to identify the minimum point. This closed-loop approach allows the system to dynamically adjust the control modification timing based on actual voltage conditions, ensuring noise reduction while using only standard feedback mechanisms already present in inverter control.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach reduces or eliminates noise pollution generated by control modifications, improving the operating stability and efficiency of the induction hob by aligning control adjustments with voltage minima.
Implementation Method 1
at least one system supply system producing a rectified and filtered voltage from said alternating voltage
Implementation Method 2
producing a rectified and filtered voltage from said alternating voltage
Implementation Method 3
each inverter device supplying power to at least one inductor in a hob of said induction hob
Implementation Method 4
at least one inductor in a hob of said induction hob
Implementation Method 5
The inverter devices are themselves powered by a rectified and filtered voltage obtained from the alternating voltage supplying the induction hob
Implementation Method 6
the tuning of the resonant system consisting of the inductor, the container and a resonant capacitor
Data Source
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AI summary
The method involves controlling one of inverter devices by a control unit and supplying alternating voltage to an induction cook top, where the cook top includes a power supply system producing rectified and filtered supply voltage (V2) from the voltage. Change of control (10) of the device is performed by a control unit when instantaneous value of the supply voltage of the device ranges between periodic minimum and 20 percent higher than the periodic minimum, where the change of control designates starting, modification of frequency or duty cycle or stop of control signals of the device. An independent claim is also included for an induction cook top comprising an inverter device.