Multi-State DC-DC Converter With Switch-Based Rectification
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Solution Overview
Problem
Existing DC-DC converters for portable devices face inefficiencies due to forward diode voltage drops and limited voltage ratings, which affect power conversion efficiency and increase power losses, and they often struggle to adapt to varying load conditions and produce flexible DC output voltages.
Innovation Solution
A DC-DC converter circuit with controllable switches configured for unidirectional current conduction, eliminating forward diode voltage drops and allowing for adaptive operation in multiple states to supply charging current to capacitors, enabling efficient power conversion and flexible output voltage generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If traditional diodes are used for current rectification in DC-DC converters, then the circuit structure is simple, but forward diode voltage drops cause power losses and reduce power conversion efficiency
Solution Approach 1:
The patent extracts the rectification function from traditional diodes and implements it using controllable switches configured for unidirectional conduction. This eliminates the forward voltage drop inherent in diodes while maintaining the rectification capability, thereby reducing power losses without significantly increasing circuit complexity
Solution Approach 2:
The invention changes the conduction characteristics of the switches by configuring them for unidirectional conduction through specific circuit topology and control strategies. This parameter change allows the switches to function as ideal rectifiers with negligible voltage drop, improving power conversion efficiency
2Adaptability or versatility
If traditional DC-DC converters are designed for fixed voltage output, then the circuit design is straightforward, but they cannot adapt to varying load conditions and multiple output voltage requirements
Solution Approach 1:
The patent implements multi-functionality by enabling the DC-DC converter to operate in multiple states (first state for charging first capacitor, second state for charging second capacitor, third state for charging both simultaneously). This allows a single circuit design to provide multiple DC output voltages and adapt to varying load conditions without requiring separate converter circuits for each function
Solution Approach 2:
The invention introduces dynamic operation by allowing the converter to switch between different operating states based on load requirements and voltage needs. The controllable switches can be dynamically configured to change conduction paths, enabling the system to adapt to varying conditions in real-time
3Reliability
If controllable switches are configured for bidirectional conduction, then the switch utilization is maximized, but reverse current flow cannot be prevented and may cause instability
Solution Approach 1:
The patent applies asymmetry by configuring the controllable switches for unidirectional conduction rather than bidirectional conduction. This asymmetric configuration prevents reverse current flow by allowing current to pass in only one direction, thereby improving voltage output stability and reliability without significantly reducing switch utilization through the use of multiple switches in coordinated operation
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 solution increases power conversion efficiency, reduces power losses, and allows for instantaneous mode switching and flexible DC output voltage generation, enhancing the performance of DC-DC converters in portable devices.
Implementation Method 1
Switch-mode DC-DC converters are operable to convert an incoming or input DC voltage level to another DC voltage level by temporarily storing the input energy and subsequently releasing stored energy to a DC output voltage node or terminal. The temporary energy storage may be in either magnetic components (for example inductors, transformers)
Implementation Method 2
A first and a second controllable switch having respective control terminals are configured for unidirectional conduction of charging current
Data Source
AI summary
DC-DC converters adapted to provide two or more DC output voltages. More particularly, a multi-state or mode DC-DC converter circuit comprising first and second controllable switches configured for unidirectional conduction of charging current.