Bidirectional DC Converter Control for Smaller Inductors
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Solution Overview
Problem
The challenge is to reduce the inductance of an inductor in a bidirectional direct current converter while controlling switching transistors, thereby minimizing the size and costs of the converter.
Innovation Solution
A controller performs complementary control on pairs of switching transistors to manage the inductance of the inductor, allowing for a higher charging and discharging frequency, which enables the use of an inductor with smaller inductance while maintaining a consistent ripple current percentage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of stationary object
If the inductance of the inductor is reduced, then the size and costs of the inductor are reduced, but the power transmission capability and stability may be compromised
Solution Approach 1:
The patent applies dynamic control by using complementary switching control on switching transistors to dynamically adjust the operating state of the inductor. This allows the inductor to operate at higher frequencies with reduced inductance while maintaining stable power transmission through active management of the switching states, resolving the contradiction between reduced size and maintained reliability.
Solution Approach 2:
The patent changes the operating parameters by increasing the switching frequency and adjusting the complementary control duty cycles of the switching transistors. This allows the system to use an inductor with smaller inductance (reduced volume) while compensating for the lower energy storage capacity through higher frequency operation, thus maintaining power transmission stability.
2Ease of manufacture
If the inductance of the inductor is reduced, then the costs of the inductor are reduced, but the energy storage capability may be compromised
Solution Approach 1:
The patent employs periodic switching action through complementary control of the switching transistors. By operating the inductor at higher switching frequencies with periodic charge and discharge cycles, the system can use a smaller, cheaper inductor with reduced inductance while maintaining adequate energy storage capability through increased cycling frequency.
Solution Approach 2:
The patent changes the energy storage approach by increasing the switching frequency parameter. Instead of relying on high inductance for energy storage, the system uses frequent switching cycles to achieve the same effective energy transfer, allowing the use of a smaller, lower-cost inductor with reduced inductance.
3Speed
If the switching frequency is increased, then the inductance can be reduced, but the losses in switching transistors may increase
Solution Approach 1:
The patent applies dynamic complementary switching control that optimizes the switching transitions. By coordinating the switching of complementary transistor pairs, the system achieves high-frequency operation with reduced overlap and minimized switching losses, allowing increased charging and discharging frequency without excessive energy loss.
Solution Approach 2:
The controller implements feedback control to monitor and adjust the switching states of the transistors. This feedback mechanism optimizes the switching timing and duration, minimizing overlapping conduction periods and reducing switching losses while maintaining the high-frequency operation needed for reduced inductance.
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 approach reduces the size and costs of the bidirectional direct current converter while increasing its power density by utilizing an inductor with smaller inductance without compromising performance.
Implementation Method 1
A first terminal of the inductor may be configured to connect to the first direct current terminal, and a second terminal of the inductor may be configured to connect to a first node
Data Source
AI summary
A bidirectional direct current converter includes a controller that controls a switching transistor in the bidirectional direct current converter to reduce an inductance of an inductor, thereby reducing a size and costs of the inductor, and further reducing a size and costs of the entire bidirectional direct current converter. The bidirectional direct current converter further includes a first switching transistor, a second switching transistor, a third switching transistor, a fourth switching transistor, and a capacitor. The controller is coupled to the first switching transistor, the second switching transistor, the third switching transistor, and the fourth switching transistor. The controller performs complementary control on the first switching transistor and the third switching transistor, and performs complementary control on the second switching transistor and the fourth switching transistor.