Load Modulation Circuit for Power Adapter Thermal Control
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Solution Overview
Problem
Power adapters face challenges in maintaining power supply stability and durability due to heat generation, which can lead to component damage and increased heat dissipation requirements, complicating design considerations such as size and cost.
Innovation Solution
A load modulation circuit with temperature and rectification sensing circuits that adjust the output signal or operating power of the power adapter based on internal temperature and rectification sensing voltages to prevent overheating, using a control circuit to generate adjustment signals when temperature sensing voltages exceed a preset range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the power adapter operates at high power to meet performance requirements, then the output power is improved, but heat generation increases leading to component damage and increased heat dissipation requirements
Solution Approach 1:
The patent implements preliminary temperature detection and adjustment actions before critical overheating occurs. The control circuit continuously monitors temperature via the temperature sensing circuit and proactively adjusts the output power or operating state when temperature approaches unsafe levels, preventing component damage before it happens.
Solution Approach 2:
The patent establishes a closed-loop feedback system where the temperature sensing circuit continuously monitors internal temperature, the control circuit compares the sensed temperature against preset thresholds, and the system automatically adjusts output power based on the temperature status. This feedback mechanism enables dynamic balancing between power output and thermal management.
2Temperature
If heat dissipation components are added to manage thermal effects, then temperature control is improved, but device complexity and volume increase
Solution Approach 1:
The patent enables the power adapter to self-regulate its temperature through integrated temperature sensing and automatic power adjustment. The system uses its own internal resources (temperature sensing circuit, control circuit) to monitor and control its thermal state without requiring external thermal management components or complex passive heat dissipation structures.
Solution Approach 2:
The patent changes the operating parameters (output power, operating frequency, or other electrical parameters) of the power adapter based on temperature conditions. By dynamically adjusting these parameters, the system achieves thermal management through electrical control rather than mechanical or thermal components, simplifying the overall device structure.
3Reliability
If temperature detection and adjustment mechanisms are implemented, then durability is improved, but manufacturing cost increases
Solution Approach 1:
The temperature sensing circuit and control circuit are designed to perform multiple functions: they not only protect against overheating but also optimize power efficiency, extend component lifespan, and potentially enable adaptive power delivery. This multi-functionality justifies the added manufacturing cost by providing multiple benefits from a single integrated system.
Solution Approach 2:
The patent employs cost-effective temperature sensing elements and control circuitry that provide reliable temperature monitoring and protection. By using affordable sensing components and simple control logic, the system achieves durability improvement without excessive manufacturing cost, making the protection mechanism economically viable for mass production.
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
The solution dynamically adjusts power adapter operation to reduce heat dissipation needs, improving durability and reducing the overall volume and cost by preventing overheating and potential component damage.
Implementation Method 1
a temperature sensing circuit, configured to obtain a temperature sensing voltage according to an internal temperature of the power adapter
Implementation Method 2
a rectification sensing circuit, coupled to a transformer circuit of the power adapter, to obtain a rectification sensing voltage
Data Source
AI summary
A load modulation circuit applied to a power adapter, comprising a temperature sensing circuit, a rectification sensing circuit and a control circuit. The temperature sensing circuit is configured to obtain a temperature sensing voltage according to an internal temperature of the power adapter. The rectification sensing circuit is coupled to a transformer circuit of the power adapter to obtain a rectification sensing voltage. The control circuit is coupled to the transformer circuit, the temperature sensing circuit and the rectification sensing circuit, and is configured to determine whether the temperature sensing voltage exceeds a preset voltage range. When the temperature sensing voltage exceeds the preset voltage range, the control circuit is configured to generate an adjustment signal according to the rectification sensing voltage to adjust an output signal or an operating power of the power adapter.