Multi-Stage Chopper Voltage Boosting for Power Conversion Efficiency
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Solution Overview
Problem
Conventional power conditioners face inefficiencies due to high power loss in chopper units when boosting DC voltage from decentralized sources like solar batteries to achieve AC output, leading to reduced overall efficiency.
Innovation Solution
The solution involves connecting multiple single-phase inverters in series, with a booster circuit that stops boosting when the input voltage exceeds a predetermined level, allowing for higher output voltage without excessive boosting, and using a DC-DC converter to manage voltage fluctuations, thereby reducing power loss and enhancing efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the boosting rate of the chopper unit is increased to achieve the required output voltage, then the output voltage requirement is met, but the power loss of the switching device and diode increases, lowering overall efficiency
Solution Approach 1:
The system divides the voltage boosting function across multiple chopper units (first chopper unit and second chopper unit) that operate in sequence. The first chopper unit performs initial boosting, and the second chopper unit performs additional boosting only when necessary. This segmentation allows the system to achieve the required output voltage while minimizing the boosting rate and power loss in each individual chopper unit.
Solution Approach 2:
The control unit dynamically adjusts the operation of chopper units based on real-time voltage conditions. When the voltage from the decentralized power source exceeds a predetermined threshold, the control unit stops the boosting operation of the first chopper unit. This dynamic control ensures that boosting is performed only when necessary, reducing unnecessary power loss while maintaining the ability to meet output voltage requirements.
2Device complexity
If a single chopper unit is used to boost voltage to the required level, then the system structure is simple, but the boosting rate must be high causing increased power loss
Solution Approach 1:
The voltage boosting function is segmented into multiple stages performed by different chopper units. The first chopper unit performs initial boosting with a lower boosting rate, and the second chopper unit provides additional boosting only when the voltage threshold is not met. This multi-stage approach reduces the boosting rate required in each unit compared to a single-unit system, thereby reducing power loss while maintaining manageable system complexity.
Solution Approach 2:
The system changes the operating parameters of the chopper units dynamically. The control unit monitors the voltage from the decentralized power source and adjusts which chopper units operate and at what boosting rates. This parameter adjustment allows the system to optimize the balance between structural complexity and power loss, using multiple units with lower individual boosting rates rather than one unit with a high boosting rate.
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 enables a power conversion apparatus with reduced power loss and improved efficiency by allowing higher output voltage without excessive boosting and effectively managing voltage fluctuations, resulting in a more efficient conversion of DC to AC power.
Implementation Method 1
a booster circuit that boosts a voltage of a third DC power source to generate a first DC power source
Implementation Method 2
The inverter unit includes four switches and carries out PWM switching to form an output current having a phase synchronous with the system voltage
Data Source
AI summary
In a power conversion apparatus that boosts a solar light voltage, converts it to AC and supplies AC power to a load or system, power loss is reduced and efficiency is improved. An inverter unit, in which AC sides of three single-phase inverters receive DC power from respective sources with a voltage ratio of 1:3:9 as respective inputs are connected in series. Gradational output voltage control of an output voltage is carried out using the sum of the respective generated AC voltages. Also, a solar light voltage is boosted by a chopper circuit to generate the highest voltage DC power source. When the solar light voltage exceeds a predetermined voltage, the boosting of the chopper circuit is stopped, thereby reducing power loss due to the boosting.