Three-Port DC-DC Converter Control for ZVS and Power Decoupling
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Solution Overview
Problem
Conventional control methods for three-port DC-DC power converters are overly complex, fail to provide optimal decoupling and zero-voltage switching (ZVS) operation, and result in high circulating currents, making them inefficient for applications requiring flexible power flow and wide voltage ranges.
Innovation Solution
A hybrid three-port DC-DC power converter with dual independent control loops and asymmetric impedances, utilizing internal and external phase shifts, and switching frequency, and asymmetric impedance, and internal phase shifts to regulate power transfer between the control loops, coupled with an inductive network, and a series resonant network, to achieve optimal control parameters, to achieve efficient power transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional control approaches are used to decouple ports, then power decoupling is achieved, but control complexity increases and ZVS operation is not maintained
Solution Approach 1:
The patent changes control parameters by using external phase shifts instead of internal phase shifts, and by regulating voltage gains. This parameter transformation simplifies the control structure while maintaining power decoupling capability and achieving ZVS operation across a wide range.
Solution Approach 2:
The control system is segmented into two independent control loops: one for regulating voltage gain between ports and another for controlling external phase shifts. This segmentation decouples the control functions, reducing overall control complexity while achieving both power decoupling and ZVS operation.
2Device complexity
If lookup tables are used to simplify control calculations, then control complexity is reduced, but implementation becomes difficult for wide voltage ranges and OBC operation
Solution Approach 1:
The patent implements dynamic control where external phase shifts and voltage gains are continuously adjusted based on real-time voltage measurements. This dynamic approach replaces static lookup tables, enabling adaptation to wide voltage ranges and OBC operation without requiring pre-computed tables for all possible conditions.
Solution Approach 2:
The control method using external phase shifts and voltage gain regulation serves multiple functions simultaneously: it handles wide voltage ranges, supports OBC operation, maintains power decoupling, and achieves ZVS operation. This universal control approach eliminates the need for separate lookup tables for different operating conditions.
3Reliability
If multiple control parameters are regulated independently, then optimal performance is achieved, but control structure becomes complex
Solution Approach 1:
The control structure is segmented into two independent loops with distinct functions: one loop regulates voltage gains to achieve power decoupling, and another loop controls external phase shifts to maintain ZVS operation. This segmentation reduces control structure complexity while maintaining optimal performance through independent regulation of key parameters.
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 solution provides wide-range zero-voltage switching (ZVS) operation with minimal circulating currents, simplifying control and reducing switching and conduction losses, enhancing power decoupling and flexibility.
Implementation Method 1
a first AC power generated by a first port is coupled to a second AC power generated by a second port through an inductive network
Implementation Method 2
The second AC power is coupled to a third AC power generated by a third port through a series resonant network
Data Source
AI summary
A control method for a hybrid three-port DC-DC power converter combining a dual active bridge converter and a dual active bridge series resonant converter topology. The controller includes a first control loop to regulate power flow between the first port and the second port and a second control loop to regulate power flow between the second port and the third port. The first control loop employs a three-mode control methodology to regulate power flow through the dual active bridge converter between the first port and the second port. The second control loop is configured with a lower bandwidth than the first control loop and regulates power flow through the dual active bridge series resonant converter between the second port and the third port.