Digital-to-Analog Converter for Paired Power Supply Control Signals
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Solution Overview
Problem
Designers face challenges in creating ac-dc power supplies that meet high power factor and efficiency standards for LED illumination while maintaining low costs, as existing solutions often require costly active circuits or complex control techniques to regulate switching signals effectively.
Innovation Solution
A digital-to-analog converter is used to produce paired control signals that vary the on-time and frequency of a switching signal in a power supply controller, allowing for precise and coordinated control of two parameters to achieve high power factor and efficiency, thereby reducing the need for expensive active circuits and complex control techniques.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If special active circuits or special control techniques are used to maintain high power factor, then power factor is improved, but device complexity and cost increase
Solution Approach 1:
The patent combines power factor correction and efficiency control functions into a single integrated controller circuit. The controller simultaneously generates first control signals for power factor correction and second control signals for efficiency control, eliminating the need for separate active circuits and reducing overall device complexity while maintaining high power factor performance
Solution Approach 2:
The controller is designed as a multi-functional device that performs both power factor correction and efficiency control through a single integrated circuit. This universal controller handles multiple functions that would traditionally require separate dedicated circuits, thereby reducing complexity and cost
2Loss of energy
If special active circuits or special control techniques are used to maintain high efficiency, then efficiency is improved, but device complexity and cost increase
Solution Approach 1:
The patent merges efficiency control with power factor correction control in a single integrated controller. The controller generates both first control signals for power factor correction and second control signals for efficiency control simultaneously, eliminating the need for separate active circuits dedicated to efficiency control and thereby reducing device complexity
Solution Approach 2:
The integrated controller serves multiple functions including power factor correction and efficiency control through a single device. This multi-functional approach replaces what would traditionally require separate dedicated circuits, reducing overall system complexity while maintaining high efficiency performance
3Measurement precision
If separate control circuits are used for power factor correction and efficiency control, then control precision is improved, but device complexity increases
Solution Approach 1:
The patent combines multiple control functions within a single integrated controller that simultaneously generates first control signals for power factor correction and second control signals for efficiency control. The controller maintains precise control for both functions while reducing device complexity by eliminating the need for separate control circuits
Solution Approach 2:
The controller internally segments control functions by generating distinct first control signals and second control signals for different purposes (power factor correction and efficiency control respectively). This segmentation of control signals within a unified controller structure allows precise control for each function while avoiding the complexity of separate physical control circuits
Data Source
AI summary
An example digital-to-analog converter (DAC) for a power supply controller includes a first node, a second node, a current source, and a switch. The first node is to be coupled to provide a first analog signal to a variable oscillator of the power supply controller. The second node is to be coupled to provide a second analog signal to the variable oscillator of the power supply controller. The switch is coupled to the current source and configured to couple the current source to the first node to provide current to the first analog signal in response to a binary digit received by the DAC, where the switch is further configured to couple the current source to the second node to provide current to the second analog signal in response to a complement of the binary digit.