EV Charging Control with Dual MCU Wake-Up for Low Battery Drain
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Solution Overview
Problem
Existing electric vehicle charging control devices consume significant battery power due to the continuous operation of the MCU, leading to unnecessary current wastage before charging power is provided.
Innovation Solution
Implementing a sub-MCU and a main MCU configuration, where the sub-MCU operates in a sleep and wake-up cycle to detect charging sequence signals, minimizing power consumption during idle periods, and using an opto-coupler and coupler switch to manage power distribution efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the MCU operates continuously to detect charging sequence signals, then the reliability of charging control is improved, but the battery power consumption increases significantly
Solution Approach 1:
The charging control device is segmented into two independent controllers: a first controller that operates continuously with low power consumption to detect charging sequence signals, and a second controller that operates only during charging. This segmentation allows the system to maintain reliable charging control while significantly reducing battery power consumption during idle periods.
Solution Approach 2:
The first controller operates in a periodic cycle, alternating between sleep mode and active detection mode. During sleep mode, power consumption is minimized; during active mode, the controller detects charging sequence signals. This periodic operation maintains system reliability while reducing average power consumption compared to continuous operation.
2Use of energy by moving object
If the MCU is put to sleep to reduce power consumption, then battery power conservation is improved, but the response time to charging signals deteriorates
Solution Approach 1:
The control functions are segmented between two controllers: the first controller remains active to continuously monitor for charging signals, while the second controller sleeps. This eliminates the response time penalty of putting the main controller to sleep, as the first controller is always ready to detect signals and wake up the second controller when needed.
Solution Approach 2:
The first controller acts as an intermediary between the external charging signal and the second controller. It continuously monitors the charging port and immediately wakes up the second controller when a charging signal is detected, ensuring rapid response time while allowing the second controller to conserve power during idle periods.
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
Reduces current consumption in the charging control device and MCU, thereby minimizing battery discharge and power wastage when the vehicle is not charging.
Implementation Method 1
an opto-coupler disposed between the charge sequence port and the first power supply and driven based on the first driving voltage, wherein the opto-coupler provides the charging sequence signal to the first controller when the charging sequence signal is input
Data Source
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AI summary
The embodiment relates to a charging control device for an electric vehicle. An electric vehicle charging control device according to an embodiment includes: a charge sequence port to which a charging sequence signal is input from a connector of a charging cable; a first power supply for supplying a first driving voltage; a first controller which is driven on the basis of the first driving voltage, repeats a wake-up state and a sleep state periodically, and generates a wake-up signal when the charging sequence signal is input to the charge sequence port in a wake-up state; a second controller for maintaining a sleep state and operating in a wake-up state when the wake-up signal is generated during the maintaining of the sleep state, and for controlling a charging operation of the electric vehicle in the wake-up state; and a second power supply, disposed between the first controller and the second controller, for providing a second driving voltage to the second controller when the wake-up signal is generated, wherein the charging sequence signal is selectively received in the wake-up state of the first controller.