Resonant Converter Gate Control for Lower Switching Loss
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Solution Overview
Problem
Existing resonant power conversion devices require additional circuit components, such as capacitors and switching elements, 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 and a capacitor/inductor connected in series or parallel, driven by a circuit that uses multiple signal values for the switching element's control signal, allowing for reduced switching loss with a simpler configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If additional circuit components (capacitor and switching element) are added to change combined capacitance, then switching loss reduction is achieved, but circuit configuration complexity increases
Solution Approach 1:
The resonant capacitor in the main circuit is made to serve dual purposes: both as a resonant element and as a variable capacitance element for controlling switching loss. The drive circuit controls the on-off state of the switching element to change the effective capacitance value of the resonant capacitor, eliminating the need for additional capacitor components while achieving soft switching conditions.
Solution Approach 2:
The resonant capacitor is given multiple functions: it operates as a resonant capacitor in the main circuit and simultaneously functions as a variable capacitance element for optimizing switching characteristics. This multi-functionality allows the system to achieve both resonant operation and reduced switching loss without adding separate components.
2Loss of energy
If resonant frequency is harmonized with switching frequency to reduce switching loss, then energy efficiency improves, but control complexity increases
Solution Approach 1:
The drive circuit dynamically controls the switching element's on-off state based on the relationship between resonant frequency and switching frequency. By adjusting the timing and duration of switching operations, the system adapts to maintain optimal resonant conditions while simplifying the control logic compared to complex frequency synthesis methods.
Solution Approach 2:
The system utilizes feedback from the resonant circuit's natural frequency characteristics to control the switching element. The drive circuit monitors the resonant conditions and adjusts the switching element's operation accordingly, creating a self-regulating control mechanism that reduces switching loss without requiring complex external control systems.
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 enables reduced switching loss by harmonizing the resonant frequency with the switching frequency, optimizing the number of situations for soft switching and maintaining a simple circuit configuration without the need for additional components.
Implementation Method 1
a series circuit configured of a resonant coil and a resonant capacitor with a resonant point near the operating frequency
Implementation Method 2
a series circuit configured of a resonant coil and a resonant capacitor
Implementation Method 3
The drive circuit includes two or more types of signal values, as a signal value of a control signal at which the switching element enters an off-state
Data Source
AI summary
A resonant power conversion device includes: a main circuit provided with a semiconductor switch, a capacitor and an inductor connected in series or parallel to the semiconductor switch; and a drive circuit configured to drive the switching element. The switching element enters an off-state or an on-state depending on a control voltage input to a gate terminal, and the drive circuit includes two or more types of control voltages, as a control voltage at which the switching element enters an off-state.