Bootstrap Voltage Control for Quiet Induction Hob Switching
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Solution Overview
Problem
Induction hobs with insufficiently charged or slowly charged bootstrap units can produce annoying clicking noises and voltage/current peaks, leading to malfunctions and potential destruction of switching units.
Innovation Solution
A household appliance device with an adjustment unit that dynamically adjusts the supply voltage based on switch driver parameters, utilizing a detection unit and voltage setting unit to ensure faster charging and maintain a constant supply voltage, thereby reducing noise and preventing peaks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the bootstrap unit is charged with a standard supply voltage, then the charging process is stable, but the charging speed is slow and noise is generated
Solution Approach 1:
The patent applies dynamics by making the supply voltage to the bootstrap unit adjustable and time-dependent. During startup, the supply voltage is increased to accelerate charging. During normal operation, the voltage is reduced to minimize noise and prevent peaks. This dynamic adjustment resolves the contradiction between fast charging and noise reduction.
Solution Approach 2:
The patent changes the electrical parameter (supply voltage) of the bootstrap unit based on operational state. By varying the voltage parameter from a higher startup value to a lower operational value, the system achieves both fast initial charging and quiet steady-state operation, resolving the contradiction between charging speed and noise.
2Productivity
If the supply voltage to the switch driver unit is increased to speed up bootstrap charging, then charging is faster, but voltage and current peaks occur causing malfunctions
Solution Approach 1:
The system dynamically adjusts the supply voltage based on the charging state and operational phase. High voltage is applied only during the initial charging phase when needed for speed. Once charged, the voltage is reduced to prevent peaks. This temporal separation resolves the contradiction between productivity and reliability.
Solution Approach 2:
The supply voltage is applied in a periodic manner: high voltage during startup charging, then switched to normal operating voltage. This periodic action allows fast charging when needed while preventing harmful peaks during continuous operation, resolving the contradiction.
3Ease of operation
If the supply voltage is kept constant, then the system is simple to control, but the bootstrap unit charges slowly and noise is generated
Solution Approach 1:
The control unit automatically detects the operational state and adjusts the supply voltage accordingly without user intervention. During startup, it provides high voltage for fast charging; during normal operation, it reduces voltage to minimize noise. This self-service approach maintains ease of operation while improving charging performance.
Data Source
Figure 1~2
Figure 3~4
AI summary
The invention relates to a domestic appliance device, in particular a cooking appliance device, comprising at least one switch driver unit (10) provided for supplying at least one switching unit (12), and comprising a bootstrap unit (14) provided for supplying at least one supply voltage (56) for the switch driver unit (10). In order to improve the switching behavior, the domestic appliance device includes at least one adjustment unit (16) provided for adjusting, in at least one operating mode, the supply voltage (56) in accordance with at least one electric characteristic of the switch driver unit (10).