DC-DC Converter Boosting Unit for High Voltage Gain
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Solution Overview
Problem
Existing DC-DC converters face limitations in voltage gain due to their circuit topology structure and duty cycle values, which restrict the achievable voltage conversion ratio.
Innovation Solution
The introduction of a boosting unit comprising specific inductors, capacitors, and unidirectional conducting devices, along with a connection control unit, allows for increased voltage gain by altering the circuit configuration during charging and discharging periods, enabling cascading of boosting units for further enhancement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a DC-DC converter uses extreme duty cycle values or transformer structures to improve voltage conversion ratio, then voltage gain is improved, but the voltage gain is still limited by circuit topology structure and duty cycle value
Solution Approach 1:
The boosting unit is divided into multiple identical modules (first boosting module, second boosting module, etc.) that can be cascaded in series. Each module contains its own inductor, capacitor, and unidirectional conducting devices. By segmenting the voltage boosting function into modular units, the circuit achieves higher voltage gain without being limited by a single complex topology structure.
Solution Approach 2:
Multiple boosting units are cascaded in a nested configuration where the output of one boosting unit feeds into the input of the next. This nested arrangement allows the voltage gain to be multiplied across stages, achieving very high voltage conversion ratios while maintaining relatively simple individual module structures.
2Power
If traditional DC-DC converter structures are used, then circuit simplicity is maintained, but voltage gain is limited and power loss increases
Solution Approach 1:
The boosting unit operates in periodic switching cycles, alternating between charging phase (where inductors store energy) and discharging phase (where capacitors release energy to the output). This periodic action allows energy to be accumulated and transferred in controlled pulses, achieving high voltage gain with reduced continuous power loss compared to linear conversion methods.
Solution Approach 2:
The circuit parameters (inductance values, capacitance values, duty cycle) are optimized to achieve high voltage gain at each stage. By carefully selecting and adjusting these parameters across multiple cascaded stages, the system achieves superior voltage conversion ratio with minimized energy loss in each conversion stage.
3Productivity
If more boosting units are cascaded to increase voltage gain, then voltage gain and productivity are improved, but device complexity increases
Solution Approach 1:
The use of identical, standardized boosting modules allows for easy scaling. Each module has the same component list and wiring pattern, so adding more stages to increase voltage gain becomes a systematic process rather than designing increasingly complex custom circuits. This segmentation enables productivity improvement through modular scaling.
Solution Approach 2:
Each boosting module is designed as a universal, multi-functional unit that can be replicated indefinitely. The same inductor, capacitor, and unidirectional conducting device configuration serves the same function in every stage, allowing the system to scale voltage gain universally without requiring different component types or complex control logic for each stage.
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 increases voltage gain, reduces power loss, and offers a smaller, more cost-effective solution compared to traditional methods, with the ability to scale voltage gain with the number of boosting units.
Implementation Method 1
a first inductor, a first terminal of the first inductor serving as an input terminal of the boosting unit... a second inductor, a second terminal of the second inductor serving as the output terminal of the boosting unit
Implementation Method 2
a boosting capacitor, a first terminal of the boosting capacitor being connected to a second terminal of the first inductor
Implementation Method 3
a first unidirectional conducting device, a first terminal of the first unidirectional conducting device being connected to the second terminal of the first inductor... a third unidirectional conducting device, a first terminal of the third unidirectional conducting device being connected to the second terminal of the boosting capacitor
Data Source
AI summary
Provided are a boosting unit, a DC-DC converter including the boosting unit, and an electric vehicle. The DC-DC converter includes: a switch connected to an input voltage; a main diode connected to the switch; a regulating capacitor, a first terminal of the regulating capacitor being connected in series with the main diode, a second terminal of the regulating capacitor being connected to the input voltage, and the first terminal and the second terminal of the regulating capacitor serving as output terminals of the DC-DC converter; and a boosting unit, the boosting unit comprising a first inductor, a second inductor, a boosting capacitor, a first unidirectional conducting device, a second unidirectional conducting device, a third unidirectional conducting device and a fourth unidirectional conducting device. According to the embodiments of the present disclosure, voltage gain can be increased by replacing inductors in the ordinary DC-DC converter with the boosting unit.