Emergency Start Charging Circuit With Adaptive Switch 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 control signals for adaptive voltage conversion.
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 the system cannot adapt to chargers with different power specifications
Solution Approach 1:
The patent implements dynamic parameter adjustment by using a control circuit that detects input voltage and current from different chargers, then dynamically adjusts the working parameters of the charging management chip and power conversion circuit accordingly. This allows the system to adapt to various charger specifications while maintaining stable operation, resolving the contradiction between fixed-parameter reliability and adaptability to different chargers.
2Reliability
If the charger power is less than the designed charging power, then the system enters protection mode to prevent damage, but normal charging cannot be achieved
Solution Approach 1:
The patent changes the operating parameters of the charging circuit based on the detected charger power capacity. When a lower-power charger is detected, the control circuit adjusts parameters such as switching frequency, duty cycle, and current limits to match the charger's capabilities, enabling safe charging operation instead of entering protection mode. This resolves the contradiction between protective shutdown and charging functionality.
3Power
If the charger power is greater than the designed charging power, then the charger can provide more power, but the charging efficiency decreases and charging time increases
Solution Approach 1:
The patent employs feedback control where the control circuit continuously monitors the input voltage and current from the charger, compares it with the optimal charging parameters stored in memory, and adjusts the power conversion circuit parameters accordingly. This feedback mechanism ensures that even when high-power chargers are connected, the system operates at optimal efficiency points, preventing energy loss and reducing charging time.
4Device complexity
If a fixed parameter charging circuit is used, then the circuit design is simple, but the charging time is long when charger power does not match
Solution Approach 1:
The patent introduces dynamic parameter adjustment capabilities that allow the charging circuit to optimize its operation based on the connected charger's power specifications. By detecting charger parameters and dynamically adjusting switching frequencies, duty cycles, and current limits, the system can maximize charging speed regardless of charger power level, significantly reducing charging time without requiring overly complex fixed-parameter designs.
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 adjusting to charger power variations.
Implementation Method 1
an inductor, a first switch, a second switch... The charging input interface is electrically connected to a first end of the inductor, a second end of the inductor is electrically connected to a first end of the first switch
Implementation Method 2
using MOS transistors and control signals for adaptive voltage conversion... a first switch, a second switch... the control circuit cyclically controls a switch on/off time of the first switch
Implementation Method 3
a first voltage acquisition circuit... configured to detect a first voltage output by the charging system in real time
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.