Resonant Power Converter Gate Control for Lower Switching Loss
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Solution Overview
Problem
Existing resonant power conversion devices require additional circuit components, complicating the circuit configuration and leading to increased switching loss.
Innovation Solution
A resonant power conversion device with a main circuit containing a switching element, capacitor, and inductor, driven by a circuit that uses multiple signal values to control the switching element's off-state, allowing for variable off-control voltages to harmonize resonant and switching frequencies, reducing switching loss without adding components to the main circuit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If additional circuit components (capacitor and switching element) are added to the main circuit to achieve resonant power conversion, then power conversion efficiency is improved, but circuit configuration complexity increases
Solution Approach 1:
The patent extracts the resonant capacitor function from a separate circuit component and integrates it into the switching element's output capacitance. By utilizing the inherent output capacitance of the switching element rather than adding a separate capacitor to the main circuit, the solution reduces circuit complexity while maintaining the resonant power conversion function that lowers switching loss.
Solution Approach 2:
The switching element is made to serve multiple functions: it acts as both the switching component and the resonant capacitor. The output capacitance of the switching element is utilized for resonant power conversion, eliminating the need for dedicated resonant capacitor components in the main circuit configuration.
2Loss of energy
If additional circuit components are added to the main circuit, then resonant power conversion is achieved, but the number of circuit components increases
Solution Approach 1:
The patent extracts the resonant capacitor function from a separate circuit component and integrates it into the switching element's output capacitance. By utilizing the inherent output capacitance of the switching element rather than adding a separate capacitor to the main circuit, the solution reduces circuit complexity while maintaining the resonant power conversion function that lowers switching loss.
3Loss of energy
If fixed control signal values are used for switching element control, then circuit operation is simplified, but switching loss increases
Solution Approach 1:
The patent implements dynamic control by using multiple signal values for the control signal instead of a fixed value. The drive circuit is configured to output different signal values at different timings, allowing the control signal to adapt to the resonant cycle and switching timing requirements. This dynamic control approach reduces switching loss by optimizing the switching moments while managing the increased control complexity through structured multi-value signaling.
Solution Approach 2:
The patent changes the parameter of the control signal from a fixed value to multiple variable signal values. By varying the control signal values according to the resonant cycle and switching requirements, the system optimizes switching timing to minimize switching loss while maintaining manageable control complexity through systematic parameter variation.
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 configuration simplifies the circuit and reduces switching loss by enabling soft switching and flexible control of resonant frequency, optimizing switching periods and frequencies to minimize energy loss.
Implementation Method 1
a series circuit configured of a resonant coil and a resonant capacitor with a resonant point near the operating frequency
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
A resonant power conversion device includes: a main circuit (10) provided with a semiconductor switch (5), a capacitor (3) and an inductor (4) connected in series or parallel to the semiconductor switch (5); and a drive circuit (20) configured to drive the switching element (5). The switching element (5) enters an off-state or an on-state depending on a control voltage input to a gate terminal (G), and the drive circuit (20) includes two or more types of control voltages, as a control voltage at which the switching element (5) enters an off-state.