Resonant Converter Discharge Control for Capacitive Load Protection
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Solution Overview
Problem
Current discharging circuits in resonant converters have a high damage rate due to the inability to effectively discharge voltage when the load characteristic is a capacitance-voltage characteristic, leading to potential damage to the circuit.
Innovation Solution
A resonant converter system with a controller that determines the load characteristic as purely resistive or capacitance-voltage based on output voltage trends and equivalent/actual capacitance values, controlling the discharging circuit to open or close accordingly, thereby preventing damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a discharging circuit is arranged at the output end to discharge voltage, then the safety of the electronic device is improved, but the complexity of the device increases
Solution Approach 1:
The patent makes the discharging circuit multi-functional by enabling it to operate in different modes (closed for discharge, open for protection) based on load characteristics. This universal approach allows a single discharging circuit design to handle multiple scenarios safely, reducing the need for additional specialized components or circuits for different load types, thereby limiting the increase in device complexity.
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 system reduces the damage rate of discharging circuits by accurately determining load characteristics and adjusting the discharging process, ensuring safe and reliable capacitor discharge without the need for anti-reverse diodes, thus reducing costs.
Implementation Method 1
A resonant converter is a resonant circuit composed of an inductor and a capacitor to implement resonance at a specific frequency, thereby implementing electric energy conversion and control.
Implementation Method 2
voltage stored on the capacitor in the resonant converter is discharged after the resonant converter stops operating, to prevent the voltage stored on the capacitor from damaging the electronic device
Data Source
Figure 1~2a
Figure 2b~3
Figure 4~5
AI summary
A resonant converter, a method for controlling a resonant converter, and a related apparatus are provided. The resonant converter includes: a first resonant conversion circuit, a second resonant conversion circuit, a switching module, a discharging circuit, and a controller. The controller outputs a first control signal to the discharging circuit in a case that a load characteristic of the resonant converter is a purely resistive characteristic; and outputs a second control signal to the discharging circuit in a case that the load characteristic of the resonant converter is a capacitance-voltage characteristic. The first control signal is configured for closing the discharging circuit, and the second control signal is configured for opening the discharging circuit.