Power Converter Control Circuit Temperature Feedback
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Solution Overview
Problem
Existing power converter technologies fail to efficiently regulate output current/power in response to temperature changes, which can lead to safety issues and inefficient battery charging.
Innovation Solution
A control circuit with a temperature-sensing device and switching circuit that generates a switching signal and current-sensing signal to regulate the output of a power converter, linearly modulating the switching signal when the temperature exceeds a limit value to adjust the output current in response to temperature increases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If large current is applied to achieve quick battery charging, then charging speed is improved, but temperature increases causing safety issues
Solution Approach 1:
The patent implements a temperature feedback control mechanism where a temperature sensing device continuously monitors the power adaptor's temperature and feeds this information back to the control circuit. The control circuit then adjusts the output current accordingly - reducing current when temperature rises above a threshold and restoring current when temperature decreases, thereby maintaining safe operating temperatures while enabling fast charging when conditions permit
Solution Approach 2:
The patent applies dynamic current adjustment based on real-time temperature conditions. Rather than using a fixed current limit, the system dynamically modifies the charging current in response to temperature changes, allowing maximum current when cold and progressively reducing current as temperature increases, thus optimizing both charging speed and thermal safety
2Reliability
If output current is reduced to control temperature, then temperature safety is improved, but charging efficiency decreases
Solution Approach 1:
The patent employs periodic monitoring and adjustment of output current based on temperature conditions. The control circuit continuously cycles through monitoring temperature, comparing against threshold, and adjusting current accordingly. This periodic control allows the system to maintain high charging efficiency during safe temperature periods while periodically reducing current only when temperature thresholds are exceeded, thus minimizing the impact on overall charging efficiency while ensuring safety
3Reliability
If temperature control is added to power converter, then safety is improved, but device complexity increases
Solution Approach 1:
The patent implements a self-regulating temperature control system where the power converter monitors and controls its own temperature without requiring external control mechanisms. The temperature sensing device is integrated within the power adaptor, and the control circuit automatically adjusts output current based on internal temperature conditions, eliminating the need for complex external thermal management systems or manual intervention
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
Effectively limits and adjusts the output current of the power converter in real-time based on temperature, ensuring safety and optimizing battery charging efficiency by inversely proportional reduction of output current with temperature increase.
Implementation Method 1
The temperature-sensing device generates a temperature signal in response to temperature of the temperature-sensing device
Data Source
AI summary
A control circuit of a power converter and a method for controlling the power converter are provided. The control circuit of the power converter comprises a switching circuit and a temperature-sensing device. The switching circuit generates a switching signal in response to a feedback signal, and the switching circuit generates a current-sensing signal for regulating an output of the power converter. The temperature-sensing device generates a temperature signal in response to temperature of the temperature-sensing device.