Power source input device for both ac and dc power sources
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Solution Overview
Problem
Conventional electric power devices are limited to using only AC power sources as commercial power, requiring multiple conversion devices at the power source input terminal, which reduces efficiency and increases complexity and cost, while also converting DC power from energy storage systems to AC, leading to inefficiencies in both power use and supply.
Innovation Solution
A power source input device that allows electric power devices to utilize both AC and DC power sources by including a first power source input unit for selective conversion of AC or DC commercial power to a DC driving power source, which can be shared among accessory devices, simplifying the configuration and reducing manufacturing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple conversion devices (AC voltage level converter, AC/DC converter, DC/DC converter) are provided at the power source input terminal to enable both AC and DC power source usage, then the electric power device can utilize both AC and DC power sources, but the device complexity and manufacturing cost increase significantly
Solution Approach 1:
The power source input terminal is designed with a universal power source input unit that can accept both AC and DC power sources through a single interface. The switching circuit selectively connects either the AC voltage level converter or the DC/DC converter based on the detected power source type, eliminating the need for separate input terminals for AC and DC powersources.
Solution Approach 2:
The power source detection unit performs preliminary detection of the input power source type (AC or DC) before the conversion process begins. Based on this detection result, the switching circuit pre-configures the appropriate conversion path, ensuring that only the necessary converter is activated and connected to the power source input terminal.
2Adaptability or versatility
If multiple conversion devices are provided to support both AC and DC power sources, then the electric power device can selectively use either power source, but the manufacturing cost increases due to additional components
Solution Approach 1:
The AC voltage level converter and DC/DC converter are merged into a single conversion system architecture, where both converters share common components such as the power source input terminal, the switching circuit, and the subsequent power utilization components. This merging reduces the total component count and manufacturing cost compared to having completely separate AC and DC input systems.
Solution Approach 2:
Instead of creating entirely separate AC and DC input systems, the invention uses a copied/adapted approach where a single power source input unit is designed to handle both AC and DC inputs, and the conversion paths are selectively activated based on the input type, reducing redundant manufacturing.
3Adaptability or versatility
If DC power from energy storage systems is converted to AC power before supply to consumers, then the power can be used by AC-powered devices, but the power use efficiency and supply efficiency decrease
Solution Approach 1:
Instead of converting DC power to AC power and then back to DC for device operation, the invention inverts the conventional approach by enabling direct DC power input and utilization. The system detects DC power source type and activates the DC/DC converter path, allowing DC power from energy storage systems to be used directly without unnecessary AC conversion, thereby reducing energy loss.
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
Enables electric power devices to use both AC and DC power sources as driving power, improving power use efficiency, reducing the load on switchboards, and enhancing overall system efficiency by allowing direct use of DC power from energy storage systems without conversion, thus simplifying the power source input terminal configuration and lowering costs.
Implementation Method 1
a first power source input unit that converts an AC or DC commercial power source selectively input from the outside into a DC driving power source
Data Source
AI summary
A power source input device for both AC/DC power sources includes a first power source input unit that is provided at a power source input terminal of an electric power device to convert an AC or DC commercial power source selectively input from the outside into a DC driving power source and supply the converted DC driving power source to an accessory device. A second power source input unit is provided in the accessory device to supply the DC driving power source supplied from the first power source input unit to at least one load, thereby simplifying a configuration of a power source input terminal of each of the electric power devices and reducing a manufacturing cost thereof.