Adapter-Free Bidirectional Power Supply With Resonant Soft Switching
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Solution Overview
Problem
Conventional bidirectional portable energy storage power supplies require external adapters for charging, leading to increased volume and weight, long charging times, and low energy conversion efficiency, which negatively impacts user experience and environmental sustainability.
Innovation Solution
A bidirectional portable energy storage power supply without an adapter, utilizing an energy storage unit, full bridge circuits, and a resonant network for bidirectional charging and discharging, implementing soft-switching to enhance efficiency and reduce volume by directly connecting with the mains network, eliminating the need for an external adapter.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If an external adapter is used for charging the portable energy storage power supply, then the power supply can be charged, but the volume and weight of the system increase making it inconvenient to carry
Solution Approach 1:
The patent merges the charging function directly into the power supply unit by integrating the inverter circuit and rectification circuit. The inverter converts DC to AC for direct mains connection during charging, and the rectification circuit converts AC to DC for battery charging, eliminating the need for a separate external adapter and reducing overall system volume.
Solution Approach 2:
The inverter circuit serves dual functions: it acts as a power conversion device for discharging (converting battery DC to AC for appliances) and as a charging interface (converting mains AC to DC through its rectification stage). This multi-functionality eliminates the need for separate charging and discharging equipment, improving portability while maintaining charging capability.
2Productivity
If an external adapter is used for charging, then the power supply can be charged, but the charging time becomes too long resulting in poor user experience
Solution Approach 1:
The patent extracts the charging function from the external adapter and implements it directly within the power supply unit. By integrating the inverter and rectification circuits, the system can accept mains power directly and convert it to battery charging current internally, enabling much faster charging compared to external adapter limitations while reducing the time loss during charging operations.
3Loss of energy
If an external adapter is used for charging, then the power supply can be charged, but the energy conversion efficiency becomes very low leading to serious energy waste
Solution Approach 1:
The patent combines the inverter and rectification functions within a single integrated circuit system. The inverter converts battery DC to AC, and the rectification circuit converts AC to DC for charging, creating a unified energy conversion pathway. This integration reduces energy losses compared to separate external adapter conversions, improving overall charging energy efficiency and reducing energy waste.
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 solution minimizes the power supply's volume, significantly reduces charging time, and improves energy conversion efficiency by using the same circuit for charging and discharging, providing several times the charging power of conventional adapters, thus enhancing user experience and energy conservation.
Implementation Method 1
boost the high-frequency low-voltage AC into a high-voltage AC through the resonant network
Implementation Method 2
the first full bridge circuit is combined with the resonant network for implementing soft-switching, to be configured to invert a low-voltage direct current (DC) of the energy storage unit into a high-frequency low-voltage alternating current (AC)
Data Source
AI summary
A bidirectional portable energy storage power supply without an adapter includes an energy storage unit, a first full bridge circuit, a resonant network, a second full bridge circuit, a third full bridge circuit and a charging and discharging interface circuit connected in turn. Each of the first full bridge circuit, the second full bridge circuit and the third full bridge circuit can be used as an inverter circuit or a rectification circuit, the charging and discharging interface circuit switchably connected with a mains network and a workload, the resonant network combined with the first full bridge circuit or the second full bridge circuit to implement soft-switching. The present disclosure can implement to bidirectionally charge and discharge the portable energy storage power supply by omitting an external adapter thereof, to improve a charging and discharging conversion efficiency, shorten a charging time and reduce a volume of power supply.