EV Charger Wake-Up Circuit for Power-Outage Handshake Startup
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Solution Overview
Problem
Conventional electric vehicle chargers fail to enable the system controller when the electric vehicle's battery power is used to supply power to external devices, leading to operational inconvenience and difficulty in setting the operation mode, as the system controller fails to communicate with the electric vehicle charger due to a lack of power source and fails to communicate with the electric vehicle charger due to a lack of power source and fails to set the charging and discharging mode by handshake communication.
Innovation Solution
A wake-up circuit for an electric vehicle charger that includes a power path, an auxiliary power circuit, a switch, a controller, and a connection end, which enables the system controller by providing a DC voltage from an energy storage device when the power source is unavailable, allowing the electric vehicle to set a feed mode and communicate with the charger.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the power device is disconnected when power is unavailable, then the system controller cannot be powered, but the electric vehicle charger cannot operate or communicate
Solution Approach 1:
The patent introduces an energy storage device as an intermediary power source between the power device and system controller. When the power device is disconnected, the energy storage device maintains power supply to the system controller through its stored energy, enabling the controller to remain operational and communicate with the electric vehicle during power outages.
2Loss of energy
If the system controller is disabled due to lack of power, then power consumption is reduced, but the charger cannot establish communication or set operation mode
Solution Approach 1:
The patent implements preliminary action by pre-charging the energy storage device before power outage occurs. The energy storage device is charged from the power device when power is available, so that when power becomes unavailable, the controller can immediately continue operation without interruption, maintaining communication capability and avoiding information loss.
3Object-affected harmful factors
If the power path is disconnected when power device fails, then system safety is improved, but the electric vehicle cannot feed power back to the charger
Solution Approach 1:
The patent implements dynamic power path configuration where the connection state of the power path is not fixed but changes based on operational conditions. The controller can dynamically connect or disconnect the power path between the electric vehicle and power device according to whether the system is in charging mode, discharging mode, or power outage state, enabling flexible bidirectional power flow while maintaining safety.
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 operate properly in a power outage state without an external power source, allowing the electric vehicle to provide power to the charger and establish a charging or discharging mode through handshake communication.
Implementation Method 1
the controller is enabled according to an energy storage voltage provided by the energy storage device
Data Source
AI summary
A wake-up circuit for an electric vehicle charger which includes a power path coupled to a power device and an electric vehicle, an auxiliary power circuit coupled to the power path, and a system controller. The wake-up circuit includes a switch, a controller and a connection end, and the switch is used to receive a trigger. When the electric vehicle charger is in a power outage state, the controller is enabled according to an energy storage voltage provided by an energy storage device coupled to the connection end. When the controller is in the power outage state, the controller notifies the electric vehicle to be set to a feed mode according to the trigger, so that the electric vehicle provides a vehicle power to the power path, and the auxiliary power circuit provides a first DC voltage to supply power to the system controller according to the vehicle power.