EV Charging Control Wake-Up Circuit for Low Battery Drain
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Solution Overview
Problem
Existing electric vehicle charging systems waste current as the MCU of the EVCC consumes significant battery power even when the vehicle is not charging, leading to unnecessary power consumption.
Innovation Solution
A charging control device with a sub-MCU that periodically switches between wake-up and sleep states, generating a wake-up signal when a charging sequence signal is detected, and a main MCU that operates only during wake-up states to control charging, minimizing current consumption during non-charging periods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the MCU of the EVCC 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 patent applies periodic action by implementing a sleep-wake cycle for the MCU. The MCU periodically wakes up to detect charging sequence signals through an opto-coupler, then returns to sleep mode. This periodic operation maintains the ability to detect charging signals while significantly reducing power consumption compared to continuous operation.
Solution Approach 2:
The patent uses preliminary action by implementing a wake-up signal mechanism. Before the MCU fully activates, a wake-up signal is generated based on voltage changes detected during sleep mode. This preliminary detection allows the system to prepare for charging operation only when necessary, avoiding continuous high-power consumption.
2Use of energy by moving object
If the MCU operates in sleep state to reduce power consumption, then battery power consumption is reduced, but the response time to charging signal detection increases
Solution Approach 1:
The patent implements preliminary action by continuously monitoring voltage changes even during the sleep state through the opto-coupler circuit. When a charging sequence signal is detected, a wake-up signal is generated immediately, allowing the MCU to transition quickly from sleep to active state. This reduces the effective response time while maintaining low power consumption during sleep.
Solution Approach 2:
The patent uses an opto-coupler as an intermediary component that remains active during MCU sleep mode. The opto-coupler detects charging sequence signals and generates wake-up signals without requiring the main MCU to be fully operational, thus enabling fast response while keeping the MCU in low-power state most of the time.
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
The solution minimizes current consumption by the charging control device when the EV is not charging, reduces power consumption in the sleep state of the MCU, and slows down the discharging speed of the battery.
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
Data Source
AI summary
A charging control device of an electric vehicle can include a charge sequence port to which a charging sequence signal is input; a first controller configured to periodically operate in a wake-up state and a sleep state, and to output a wake-up signal when the charging sequence signal is input in the wake-up state; a second controller configured to operate in a wake-up state when the wake-up signal is output during maintaining of a sleep state; a first power supply configured to supply a first driving voltage to the first controller; and a second power supply disposed configured to supply a second driving voltage to the second controller when the wake-up signal is generated. Also, the second controller is configured to control a charging operation of the electric vehicle in the wake-up state.