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This invention provides a unique control strategy for the conventional stacked structure LLC resonant converter.
About
This invention provides a unique control strategy for the conventional stacked structure LLC resonant converter. By adopting the proposed control strategy, a three level LLC resonant network input voltage is generated, which includes Vin, Vin/2 and 0. Instead of adopting frequency control strategy, the PWM control strategy is adopted to regulate the output by controlling the duration of each voltage level.
Key Benefits
The proposed PWM-controlled stacked structure LLC resonant converter has the following advantages: 1) Fixed switching operation can be achieved, which is beneficial to the design and optimization of magnetic components. 2) The relationship between the voltage gain and the control variable-duty ratio is monotonous, which simplifies the design of controller and guarantees the stability of the system. 3) No modification on the conventional LLC resonant converter is required, which increases the reliability and reduces the cost of the system. 4) The voltage gain of the proposed PWM-controlled three level LLC resonant converter is independent of the output load, which is suitable for wide range application. 5) The stacked structure can reduce the voltage stress for the switches, which is suitable for high input voltage application. In addition, low voltage rating device can be selected to improve the system efficiency. This invention is advantageous in high input voltage, high step-down conversion ration, and wide input/output voltage range applications, such as data center server power supply, renewable energy systems, electric vehicle on-board battery charger and so on. Therefore, Emerson, Google, Microsoft, Amazon, Eaton, General Electric and other companies would benefit from this invention.
Applications
Wide input or output voltage range application is challenging for the conventional frequency-controlled LLC resonant converter. The proposed PWM-controlled stacked structure LLC resonant converter can be applied for wide range application with fixed switching frequency. Therefore, this method may serve: 1. Automotive power electronics 2. Renewable energy generation system 3. Data center power supply 4. Applications in medium and high HVDC 5. Applications requiring high power density 6. Applications requiring low cost and simplicity