Power Supply with Bidirectional Load Signaling
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Solution Overview
Problem
Conventional switching power supplies lack the ability to dynamically adjust their operation based on the specific requirements of different loads, limiting their versatility and efficiency in various applications.
Innovation Solution
A configurable power supply system that uses bidirectional communications via conductive terminals to determine the load type and select between constant-current and constant-voltage modes, incorporating a power switching transistor and signal-forming resistor for signaling, and a controller to manage these communications and adjust power delivery accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional switching power supplies use fixed operation modes, then the device complexity is reduced, but the adaptability to different load types deteriorates
Solution Approach 1:
The power supply is designed to perform multiple functions by detecting load type through communication signals and automatically switching between constant-voltage and constant-current modes, making a single device suitable for diverse applications such as battery charging and LED lighting without requiring multiple dedicated power supplies
Solution Approach 2:
The power supply automatically detects the connected load type through bidirectional communication and self-configures its operating parameters without user intervention, selecting the appropriate power delivery mode based on the detected load characteristics
2Adaptability or versatility
If the power supply uses bidirectional communication to detect load type, then the adaptability improves, but the device complexity increases
Solution Approach 1:
The communication signaling circuitry is integrated directly into the existing power delivery terminals, combining the power transmission function with the load detection function. The same conductive terminals used for power delivery also serve as the communication interface, eliminating the need for separate communication hardware
3Ease of operation
If the power supply automatically selects power delivery modes, then the ease of operation improves, but the device complexity increases
Solution Approach 1:
The controller automatically detects load type through communication signals and self-configures the power delivery mode without user intervention, making the power supply adaptable to different applications while maintaining simple operation for the user
Data Source
AI summary
A power supply includes signaling circuitry coupled to output terminals for engaging in bidirectional communications with a load. A controller is capable of conducting the bidirectional communications and selecting among different operating modes for the power supply based on the communications. The modes may include a constant-current mode suitable for applications such as battery charging and power LED lamps, and a constant-voltage mode suitable for a variety of conventional uses such as powering electronic circuitry. The signaling circuitry may include a power switching transistor in series with the load, which is pulsed in a binary fashion to transmit communications to the load. A signal-forming resistor in parallel with the power switching transistor develops a signaling voltage monitored by the controller to receive communications from the load.