Emergency Start Charging Circuit With Adaptive PWM Voltage Control
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Solution Overview
Problem
Existing automotive emergency start power supply charging systems require dedicated chargers matching specific internal charging circuit parameters, leading to inefficiencies and potential damage when charger power deviates from designed specifications.
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 MOS transistors and PWM control for adaptive voltage conversion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If dedicated charging management chips with fixed parameters are used, then charging stability is improved, but charging efficiency deteriorates when charger power does not match designed specifications
Solution Approach 1:
The patent implements dynamic parameter adjustment by using a control circuit that continuously monitors charging current and voltage, then dynamically adjusts the duty cycle of PWM signals to optimize charging parameters in real-time based on actual charger output characteristics
Solution Approach 2:
The patent changes charging parameters dynamically by adjusting the duty cycle of switch tubes based on detected charging current and voltage levels, allowing the system to adapt to different charger power levels and maximize charging efficiency under varying conditions
2Reliability
If charger power is less than designed charging power, then device safety is improved through protection mechanisms, but charging functionality deteriorates due to protection triggering
Solution Approach 1:
The patent employs feedback mechanisms where the control circuit continuously detects charging current and voltage, then adjusts the duty cycle accordingly to prevent overcurrent and overheating while maintaining charging functionality even with lower-power chargers
Solution Approach 2:
The patent implements protective measures in advance by monitoring charging parameters and preemptively adjusting the duty cycle to prevent harmful conditions before they occur, allowing safe charging even when charger power is insufficient
3Speed
If charger power is greater than designed charging power, then charging speed is improved, but charging efficiency deteriorates due to inability to maximize charger power utilization
Solution Approach 1:
The patent uses dynamic duty cycle adjustment to match the charging parameters to the actual charger output, enabling the system to fully utilize higher-power chargers while maintaining optimal charging efficiency through real-time parameter optimization
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 power variations.
Implementation Method 1
an inductor, a first switch, a second switch... a second end of the inductor is electrically connected to a first end of the first switch and a first end of the second switch respectively
Implementation Method 2
the control circuit cyclically controls a switch on/off time of the first switch based on the first voltage
Implementation Method 3
using MOS transistors and PWM control for adaptive voltage conversion
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 the second switch.