EV Charger Wake-Up Circuit for Feed Mode Handshake
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Solution Overview
Problem
Conventional electric vehicle chargers fail to enable the system controller when the battery power is used to supply power to external devices, leading to operational inconvenience and difficulty in setting charging and discharging modes due to the lack of a power source for the system controller.
Innovation Solution
A wake-up circuit and method that includes a switch and transistor to adjust impedance on the proximity pilot pin, allowing the electric vehicle to set a feed mode and provide power to the system controller, enabling handshake communication and operation even in power outage conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the power device is disconnected from the power path when battery power is used to supply external devices, then the system controller loses its power source and cannot operate, but if the power device remains connected, then the system controller can operate but the electric vehicle cannot properly set feed mode
Solution Approach 1:
The patent introduces a wake-up circuit as an intermediary component that includes a trigger input, transistor, and switch. This circuit mediates between the power path and the system controller by detecting specific signals (such as impedance changes on the proximity pilot pin) and activating the system controller without requiring continuous power from the power device. The wake-up circuit enables the system controller to be temporarily powered and activated just enough to perform handshake communication and mode setting, then return to sleep mode, thus resolving the contradiction between maintaining controller operation and enabling feed mode capability.
2Ease of operation
If the system controller is continuously powered to maintain operation, then the controller can perform handshake communication, but the electric vehicle cannot feed power back to the power device
Solution Approach 1:
The patent implements periodic action by designing the system controller to operate in alternating states: active state for handshake communication and mode setting, and sleep state for power conservation. The wake-up circuit triggers the controller periodically when needed (during vehicle connection and mode setting), allowing the controller to be powered only when necessary to perform communication functions, then powered down to enable the vehicle to feed power back to the device.
3Adaptability or versatility
If the wake-up circuit is added to enable controller activation without external power, then the controller can be enabled in power outage state, but the device complexity increases
Solution Approach 1:
The wake-up circuit is designed with multi-functionality to minimize added complexity. The same circuit components (transistor, switch, trigger input) serve multiple purposes: detecting vehicle connection, activating the system controller, enabling handshake communication, and allowing mode setting. By making the wake-up circuit universal and multi-functional rather than adding separate dedicated components for each function, the patent reduces the overall complexity increase while achieving operation in power outage state.
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 the electric vehicle charger to properly operate without an external power source, allowing it to communicate with the electric vehicle and set the appropriate charging or discharging mode, ensuring seamless operation even during power outages.
Implementation Method 1
the transistor includes a first end and a second end. The first end is coupled to a proximity pilot pin of the system controller, and the second end is coupled to a reference potential by the switch. When the transistor is turned on, the proximity pilot pin is coupled to the reference potential by the transistor to adjust an impedance of the proximity pilot pin from a first impedance to a second impedance
Data Source
AI summary
An electric vehicle charger is used to couple a power device and an electric vehicle by a power path, and a method for operating the electric vehicle charger includes steps of: entering a power outage state of the system controller of the electric vehicle charger when the power device when the power device power fails to supply a device power to the power path. According to a trigger, informing the electric vehicle to set a feed mode by a transistor that is turned on in the power outage state, so that the electric vehicle to provide a vehicle power to the power path. Causing the auxiliary power circuit to provide the first DC voltage to supply power to the system controller according to the vehicle power, thereby enabling the system controller and performing handshake communication with the electric vehicle.