Converting Controller Pin Multiplexing for Overcurrent Protection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional converting controllers require multiple pins to set over current protection values and time periods, increasing costs due to the complexity of pin management.
Innovation Solution
A converting controller uses a single pin to set over current protection values and time periods through time-division and/or voltage and current methods, allowing for reduced pin count and enabling the time period to also set constant on/off times and operating frequencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple pins are used to set over current protection value and time period separately, then the controller can independently configure both parameters, but the pin count increases causing higher cost
Solution Approach 1:
The patent combines the over current protection value setting and time period setting into a single pin by using time-division multiplexing. The controller alternates between sampling the voltage signal (for over current protection value) and current signal (for time period) during different time intervals within one oscillation cycle, thereby merging two configuration functions into one physical pin without sacrificing independent configurability
Solution Approach 2:
The single pin is designed to serve multiple functions: it can sample both voltage signals (for over current protection) and current signals (for time period) by switching between different sampling modes. This multi-functional design allows the pin to replace what would traditionally require two separate pins, reducing device complexity while maintaining full configuration capability
2Device complexity
If time-division method is used to sample voltage and current signals through the same pin, then the pin count is reduced, but the sampling timing becomes more complex
Solution Approach 1:
The patent implements periodic sampling based on the oscillation cycle of the converting circuit. During each complete oscillation cycle, the controller periodically switches between voltage sampling mode and current sampling mode at predetermined time points. This periodic action structure simplifies the control logic by tying sampling timing to the natural oscillation rhythm of the circuit, making the complex timing management more systematic and predictable
3Device complexity
If the same pin is used for both over current protection and time period setting, then cost is reduced, but the signal differentiation becomes more difficult
Solution Approach 1:
The controller uses feedback signals from the oscillation circuit to determine when to switch between sampling modes. By monitoring the oscillation state and using feedback timing signals, the controller can accurately distinguish whether to sample voltage or current at any given moment, thereby solving the signal differentiation problem without requiring additional pins or complex external timing circuits
Data Source
AI summary
The present invention employs a pin of a controller to set an over current protection value and a time period respectively by means of time-division and/or voltage and current. Therefore, the cost of the controller is reduced due to reducing the amount of pins thereof. Furthermore, the time period is not only used to setting a constant on time, but also used to setting a constant off time and an operating frequency for different controlling mode.