Boost Converter PWM Control for Inductor Temperature Adjustment
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Solution Overview
Problem
Boost converters in notebook computers experience performance degradation due to excessive internal temperatures, necessitating a solution to manage and adjust temperature effectively.
Innovation Solution
A boost converter with integrated temperature adjustment functionality, incorporating a bridge rectifier, inductor, absorption circuit, power switch element, output stage circuit, feedback compensation circuit, and detection and control circuit, utilizing a temperature-dependent voltage to adjust PWM duty cycle and enable/disable absorption circuits to regulate temperature.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the boost converter operates at high power, then the output voltage and current increase, but the internal temperature rises excessively
Solution Approach 1:
The patent implements dynamic temperature adjustment by detecting the temperature of the first inductor and dynamically adjusting the duty cycle of the PWM signal. The detection and control circuit generates a control voltage that modifies the PWM duty cycle based on temperature feedback, allowing the converter to adapt its operating parameters in real-time to maintain optimal temperature while delivering high power output.
Solution Approach 2:
The patent changes the operating parameters of the boost converter based on temperature conditions. Specifically, it adjusts the duty cycle parameter of the PWM signal according to the detected temperature of the first inductor. This parameter change allows the converter to reduce power dissipation and heat generation when temperature becomes excessive, while maintaining high power output under normal operating conditions.
2Stress or pressure
If the duty cycle of PWM voltage is increased to improve output voltage, then the output voltage increases, but the temperature of the first inductor increases
Solution Approach 1:
The patent employs feedback control by using the detection and control circuit to monitor the temperature of the first inductor and adjust the PWM duty cycle accordingly. The feedback mechanism creates a closed-loop control system where temperature information is continuously monitored and used to modify the duty cycle, ensuring that output voltage requirements are met while preventing excessive inductor temperature rise.
Solution Approach 2:
The patent makes the duty cycle dynamic rather than fixed. The detection and control circuit continuously adjusts the duty cycle based on real-time temperature feedback from the first inductor. This dynamic adjustment allows the system to optimize the balance between achieving required output voltage and minimizing inductor temperature increase.
3Stability of the object's composition
If the absorption circuit is enabled to reduce voltage spikes, then the voltage stability improves, but the power loss increases
Solution Approach 1:
The patent uses periodic action by enabling the absorption circuit selectively based on temperature conditions rather than continuously. The detection and control circuit determines when to activate the absorption circuit by monitoring temperature and voltage conditions, allowing it to operate periodically only when needed for voltage spike suppression. This periodic activation reduces continuous power loss while maintaining voltage stability when required.
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 maintains optimal operating temperatures by reducing the probability of excessive heat in internal components, enhancing the overall performance and reliability of the boost converter.
Implementation Method 1
a temperature-dependent voltage VX generated by a detection and control circuit 260, wherein the temperature-dependent voltage VX is related to a temperature T of the first inductor L1
Data Source
AI summary
A boost converter with the function of temperature adjustment includes a bridge rectifier, a first inductor, an absorption circuit, a power switch element, an output stage circuit, a feedback compensation circuit, and a detection and control circuit. The absorption circuit is coupled in parallel with the first inductor. The absorption circuit is selectively enabled or disabled according to the control voltage. The power switch element selectively couples the first inductor to the ground voltage according to the PWM (Pulse Width Modulation) voltage. The detection and control circuit generates the control voltage and adjusts the duty cycle of the PWM voltage according to a temperature-dependent voltage. The temperature-dependent voltage is related to the temperature of the first inductor.