Heating device and control method thereof
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Solution Overview
Problem
Induction cookers generate noise due to excessive instantaneous current when capacitors are discharged, affecting the quality of use.
Innovation Solution
A heating device with a controller that outputs complementary control signals to switches and capacitors, managing the discharging process to reduce the duty cycle and prevent excessive current flow through the coil, using a series and parallel configuration of capacitors and a coil to generate an induced magnetic field.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the capacitor is discharged with high instantaneous current when the induction cooker is initiated, then the heating power is improved, but the pot vibrates and generates noise
Solution Approach 1:
The patent applies preliminary action by discharging the capacitor through a dedicated discharging switch before the main heating switch is activated. This preliminary discharge action removes the harmful instantaneous current that would otherwise cause pot vibration and noise, while preserving the capacitor's ability to deliver full power when needed for heating.
Solution Approach 2:
The patent segments the capacitor discharge process into two distinct phases: a preliminary discharging phase through the discharging switch, and a main heating phase through the heating switch. This segmentation allows the system to separate the harmful instantaneous current effect from the useful heating function, enabling noise reduction without sacrificing heating performance.
2Use of energy by moving object
If multiple capacitors are used in the circuit architecture, then the energy storage capacity is improved, but the instantaneous current causes pot vibration and noise
Solution Approach 1:
The patent applies preliminary action by introducing a discharging switch that activates before the main heating operation. This switch provides a predetermined discharge path for the capacitor, eliminating the harmful instantaneous current that causes noise and vibration, while preserving the full energy storage capacity for effective heating when needed.
Solution Approach 2:
The discharging switch acts as an intermediary element between the capacitor and the heating circuit. It provides a controlled pathway for capacitor discharge, mediating the energy release to prevent harmful instantaneous current while allowing the capacitor's full energy storage capacity to be utilized for heating through the main heating switch.
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
The solution effectively reduces noise and vibration by controlling the discharging process, allowing for a soft-start operation and efficient heating without excessive current, thereby improving the user experience.
Implementation Method 1
the coil is coupled between the first node and the second node, and is configured to generate the induced magnetic field
Data Source
AI summary
A heating device includes a first capacitor, a first switch, a second switch, a second capacitor, a third capacitor, a coil and a controller. The first and second switch are coupled in series at a first node, and are coupled with the first capacitor in parallel. The second capacitor is coupled to the first switch. The third capacitor is coupled to the second switch, and is coupled to the second capacitor at a second node. The coil is coupled between the first and the second node. The controller outputs a first and a second control signal to the first switch and the second switch, respectively. After the heating device received a voltage and a starting command, the controller outputs the first and the second control signal to turn on or off the first and the second switch respectively. The duty cycle of the first signal is lower than 50%.