Bidirectional Power Converter for Stable Vacuum Cleaner Inverter Voltage
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Solution Overview
Problem
Existing power supply systems for vacuum cleaners face challenges in maintaining a constant input voltage for inverters, especially when switching between commercial AC power and battery charging power, which affects the efficiency and convenience of operation.
Innovation Solution
A power supply apparatus comprising a first power converter for AC to DC conversion, a bidirectional DC-DC converter for voltage dropping and boosting, and an inverter for converting DC to AC, controlled by a controller to maintain a constant input voltage for the inverter, allowing for efficient operation with both commercial AC and battery power.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a power supply system uses separate power conversion circuits for different voltage levels, then voltage conversion flexibility is improved, but the number of components and system complexity increases
Solution Approach 1:
The bidirectional DC-DC converter is designed to perform multiple functions: it can step down voltage from the first DC voltage level to the second level for battery charging, and step up voltage from the second level to the first level for inverter operation. This single circuit replaces what would traditionally require separate buck and boost converters, reducing component count while maintaining voltage conversion flexibility.
Solution Approach 2:
The power supply system dynamically switches between different operating modes of the bidirectional DC-DC converter depending on whether AC power or battery power is available. The converter adapts its operation (charging mode vs. power delivery mode) based on real-time power source availability, enabling the system to handle varying voltage requirements without requiring dedicated circuits for each scenario.
2Adaptability or versatility
If the inverter input voltage varies with different power sources, then power source versatility is improved, but inverter efficiency and reliability deteriorate
Solution Approach 1:
The bidirectional DC-DC converter acts as an intermediary between the power sources (AC adapter or battery) and the inverter. It ensures that regardless of which power source is used, the inverter always receives a stable first DC voltage level. This mediator circuit isolates the inverter from voltage variations caused by different power sources, maintaining reliable operation while preserving power source versatility.
Solution Approach 2:
The system changes the voltage parameter at the inverter input by using the bidirectional DC-DC converter to regulate and stabilize the first DC voltage level. This parameter control ensures that the inverter operates within its optimal voltage range regardless of whether power comes from the AC adapter or battery, maintaining efficiency and reliability across different power sources.
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 ensures a constant input voltage for the inverter, simplifying the power supply apparatus design, reducing size and manufacturing costs, and enhancing operational convenience by maintaining a stable power supply across different power sources.
Implementation Method 1
a first power converter configured to convert a first Alternating Current (AC) voltage into a Direct Current (DC) voltage
Implementation Method 2
a second power converter configured to drop the DC voltage output from the first power converter and transfer the dropped DC voltage to a power storage unit, and to boost a DC voltage of the power storage unit and output the boosted DC voltage
Implementation Method 3
a third power converter configured to convert a DC voltage among the DC voltage output from the first power converter and the boosted DC voltage output from the second power converter, into a second AC voltage
Data Source
AI summary
Disclosed herein are a power supply apparatus, and an electric apparatus and a vacuum cleaner having the power supply apparatus. According to an aspect of the present disclosure, the power supply apparatus includes: a first power converter configured to convert a first Alternating Current (AC) voltage into a Direct Current (DC) voltage; a second power converter configured to drop the DC voltage output from the first power converter and transfer the dropped DC voltage to a power storage unit, and to boost a DC voltage of the power storage unit and output the boosted DC voltage; and a third power converter configured to convert a DC voltage among the DC voltage output from the first power converter and the boosted DC voltage output from the second power converter, into a second AC voltage, and to transfer the second AC voltage to a load.