Emergency Start Charging Circuit With Voltage-Feedback Duty Control
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Solution Overview
Problem
Existing automotive emergency start power supply charging systems require specific charger parameters, leading to inefficiencies and potential damage when chargers deviate from these specifications, resulting in either insufficient charging or low efficiency.
Innovation Solution
A charging system with an inductor, switches, voltage acquisition circuit, and control circuit that dynamically adjusts switch states based on real-time voltage to stabilize output, using boost or buck conversion modes to match the power supply's requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a dedicated charging management chip with fixed parameters is used, then the charging circuit can operate stably at designed parameters, but it cannot adapt to chargers with different power specifications, leading to protection triggering or damage when charger power deviates from design values
Solution Approach 1:
The patent implements dynamic parameter adjustment by using a control circuit that continuously monitors charging current and voltage, and dynamically adjusts the duty cycle of switching elements to adapt to different charger power specifications. This transforms the fixed-parameter charging circuit into a dynamic system that can accommodate varying charger capabilities while maintaining stable operation
Solution Approach 2:
The patent changes the operating parameters of the charging circuit by adjusting the switching duty cycle based on real-time detection of charging conditions. When charger power is insufficient, the system reduces the duty cycle to lower the current demand; when charger power exceeds design specifications, the system adjusts parameters to prevent overcharging, thereby adapting to different charger specifications without requiring a dedicated charging management chip
2Reliability
If the charger power is less than the designed charging power, then the system can avoid overcharging, but the protection mechanism triggers and prevents normal charging operation
Solution Approach 1:
The patent employs a feedback mechanism where the control circuit continuously monitors the charging current and voltage, compares them with reference values, and adjusts the switching duty cycle accordingly. This closed-loop feedback allows the system to recognize when charger power is insufficient and automatically adjusts parameters to enable continuous charging operation without triggering protection mechanisms, thereby maintaining both safety and charging efficiency
3Power
If the charger power is greater than the designed charging power, then more charging power is available, but the charging circuit cannot maximize utilization leading to low charging efficiency and longer charging time
Solution Approach 1:
The patent uses dynamic duty cycle adjustment to optimize the utilization of available charging power. The control circuit monitors the charging conditions and dynamically modifies the switching parameters to match the actual charger capability, ensuring that the charging circuit operates at optimal efficiency regardless of whether the charger power is higher or lower than the design specification, thus maximizing charging speed while avoiding energy waste
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
Stabilizes output voltage and current, maximizing charging efficiency and preventing damage by adapting to charger deviations, ensuring stable and efficient charging.
Implementation Method 1
a charging system, configured for charging an energy storage power supply. The charging system includes a charging input interface, an inductor, a first switch, a second switch, a first voltage acquisition circuit, and a control circuit
Data Source
AI summary
A charging system includes a charging input interface, an inductor, a first switch, a second switch, a first voltage acquisition circuit, and a control circuit. The charging input interface is connected to the inductor, which is connected to the first switch and the second switch. The second switch is configured for electrical connection with an energy storage power supply. The first voltage acquisition circuit is connected to the second switch and configured to detect the first voltage output by the charging system in real time. The control circuit cyclically controls the switch on/off time of the first switch based on the first voltage. During the charging process of the charging system, when the first voltage is less than the first preset voltage value, the control circuit controls the first switch to conduct and starts cyclic control. The state of the first switch is opposite to that of second switch.