Switched-Inductor DC-DC Converter for Flexible Voltage Ratio Control
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Solution Overview
Problem
Existing DC-DC conversion schemes, such as Buck converters and boost circuits, face limitations in controlling output voltage and efficiency, particularly in scenarios where increased output current is desired without excessive energy loss as heat.
Innovation Solution
A DC-DC conversion scheme featuring a main inductor connected in series with parallel circuit legs, each comprising primary, secondary, and tertiary inductors and switches, allowing for adjustable ratios of inductance upstream and downstream of the active switched ground connections to control the input-to-output voltage ratio through precise switching and inductor configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a linear regulator is used for DC-DC conversion, then the circuit is simple, but energy loss as heat is excessive
Solution Approach 1:
The patent replaces the linear regulation mechanism (analogous to mechanical friction-based voltage dropping) with a switching-based DC-DC conversion system using Buck and Boost converters. This substitution enables efficient energy transfer through magnetic fields rather than resistive heating, dramatically reducing energy loss while maintaining circuit functionality
Solution Approach 2:
The patent employs periodic switching of electronic switches in the DC-DC conversion circuitry to transfer energy between input and output. By rapidly switching between storage and transfer states, the system achieves efficient energy conversion without continuous energy dissipation, resolving the contradiction between simplicity and energy efficiency
2Loss of energy
If a Buck converter is used to step down voltage, then energy loss as heat is reduced, but the ability to step up voltage is lost
Solution Approach 1:
The patent implements a universal DC-DC conversion system that can operate in multiple modes (Buck, Boost, and bidirectional conversion) within a single circuit architecture. This multi-functional design allows the system to step down voltage when needed while also capable of stepping up voltage, eliminating the limitation of single-mode converters and reducing energy loss across all operating conditions
3Device complexity
If the inductance ratio is fixed, then the circuit is simple, but control over output voltage is limited
Solution Approach 1:
The patent introduces dynamic control of the inductance ratio through switched capacitor networks and controllable impedance elements. The inductance ratio can be adjusted in real-time based on load conditions and desired output voltage, providing flexible control while maintaining relatively simple circuit topology through automated switching control
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 configuration enhances control over the output voltage, achieving improved efficiency and flexibility in voltage regulation by varying the inductance ratios, thereby overcoming the limitations of traditional schemes.
Implementation Method 1
The inductor 1 will produce an emf opposing the increase in current, and energy will be stored within the inductor 1
Implementation Method 2
Subsequent opening of the switch 2 will interrupt the connection between the supply 3 and the load 5, and will also result in discharge of the energy stored within the inductor 1 through the load 5 and diode 3
Data Source
AI summary
A DC-DC conversion scheme is described and includes a main inductor connected in series with a first circuit leg and a second circuit leg, the first and second circuit legs being arranged in parallel with one another. Each circuit leg includes a first inductor, a second inductor and a third inductor arranged in series with a primary switch, a first switched ground connection being connected to a location between the first and second inductors, and a second switched ground connection being connected to a location between the second and third inductors. The first, second and third inductors of the first and second legs are wound upon a common core.