EV Charging Circuit With AC Conversion and DC Bypass
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Solution Overview
Problem
The existing charging devices for electrified vehicles face inefficiencies due to repeated power conversion from direct-current power generated by solar panels to alternating-current power and back, leading to energy loss, and require multiple devices for different power sources, complicating user convenience and energy utilization.
Innovation Solution
A charging device with an input port for both direct-current and alternating-current power and a relay circuit that includes a converter circuit and an input bypass circuit, allowing it to accept and convert alternating-current power to direct-current power, or bypass conversion when direct-current power is input, ensuring efficient charging regardless of the power source.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If direct-current power from solar panels is converted to alternating-current power and then reconverted to direct-current power for charging, then the charging device can operate with standard power sources, but energy efficiency deteriorates due to repeated power conversion losses
Solution Approach 1:
The charging device dynamically switches between two operational modes: AC conversion mode (using the converter circuit) and DC bypass mode (using the input bypass circuit). This dynamic adaptation allows the system to select the optimal power transmission path based on the input power type, thereby resolving the contradiction between versatility and energy efficiency
Solution Approach 2:
The relay circuit acts as an intermediary that intelligently routes power between different paths. It mediates between the converter circuit (for AC to DC conversion) and the input bypass circuit (for direct DC transmission), selecting the appropriate path to eliminate unnecessary conversion steps while maintaining compatibility with both AC and DC power sources
2Reliability
If separate charging devices are prepared for direct-current and alternating-current power sources, then each device can be optimized for its specific power source, but device complexity and user convenience deteriorate due to requiring multiple devices
Solution Approach 1:
The charging device is designed with multi-functionality to handle both AC and DC power inputs. By integrating both the converter circuit and the input bypass circuit within a single device, it eliminates the need for separate charging devices for different power sources, thereby reducing device complexity while maintaining optimization for each power type
Solution Approach 2:
The relay circuit enables dynamic switching between AC conversion mode and DC bypass mode within a single charging device. This dynamic capability allows the device to adapt its internal configuration based on the input power type, achieving the reliability of specialized devices while maintaining the simplicity of a single universal device
3Ease of operation
If a charging device accepts both direct-current and alternating-current power, then user convenience improves by using a single device, but device complexity increases due to requiring both converter circuit and bypass circuit
Solution Approach 1:
The relay circuit serves as a smart intermediary that manages the complexity of having both converter and bypass circuits. It automatically routes power through the appropriate path based on input detection, shielding the user from the underlying complexity while enabling ease of operation with a single universal charging device
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 enables a single charging device to handle both direct-current and alternating-current power sources, reducing energy loss and user complexity, promoting the use of renewable energy and contributing to a carbon-free society by eliminating the need for multiple devices.
Implementation Method 1
a converter circuit that converts alternating-current power into direct-current power when the alternating-current power is input to the input port
Data Source
AI summary
A charging device disclosed herein includes an input port, an output port, and a relay circuit. The input port is electrically connected to an external power source provided externally and that is configured to be able to input direct-current power and alternating-current power from the external power source. The output port is electrically connected to an electrified vehicle and that outputs direct-current power to the electrified vehicle. The relay circuit relays electric power between the input port and the output port. The relay circuit includes a converter circuit that converts alternating-current power into direct-current power when the alternating-current power is input to the input port, and an input bypass circuit that causes direct-current power to bypass the converter circuit when the direct-current power is input to the input port.