Auxiliary Winding Power Supply Monitoring for Same-Cycle Protection
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Solution Overview
Problem
Existing power supply monitoring systems face inefficiencies due to time-division detection methods, which delay critical protection mechanisms like over-voltage protection (OVP) and over-temperature protection (OTP), increasing damage risk by not executing all necessary protections in every switch cycle.
Innovation Solution
A method and circuit utilizing an auxiliary winding to sense an auxiliary side voltage, combined with voltage division and multiple detection circuits operating in the same switching period to monitor power supply parameters, including ambient temperature, output voltage, and input voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If time-division detection is used to share circuit resources for OTP and OVP, then circuit cost is reduced, but detection speed and protection reliability deteriorate because not all protection mechanisms can be executed in every switch cycle
Solution Approach 1:
The patent segments the detection function by providing separate detection circuits for different parameters (temperature, output voltage, input voltage) rather than using a single shared detection circuit. This allows each parameter to be detected independently and simultaneously in every switching period, ensuring that protection reliability is not compromised while still using resource-sharing techniques where appropriate (e.g., sharing the auxiliary winding voltage among multiple detection circuits through voltage division).
Solution Approach 2:
The patent implements multi-functionality by designing detection circuits that can handle multiple detection tasks. The auxiliary winding provides an auxiliary voltage that is divided and used by multiple detection circuits simultaneously. The detection circuits are designed to universally handle different detection scenarios (temperature, output voltage, input voltage) within the same switching period, eliminating the need for time-division multiplexing while maintaining circuit efficiency.
2Adaptability or versatility
If time-division detection is used to share circuit resources, then circuit resource sharing is improved, but detection precision and response time worsen due to delays in executing protection mechanisms
Solution Approach 1:
The patent divides the detection function into separate specialized circuits for temperature, output voltage, and input voltage detection. Each circuit operates independently and continuously monitors its specific parameter every switching period, ensuring high detection precision and immediate response without the delays inherent in time-division detection schemes.
Solution Approach 2:
The patent ensures continuous monitoring of all critical parameters by operating multiple detection circuits simultaneously in every switching period. This continuous action eliminates the intermittent detection caused by time-division methods, maintaining both high precision and real-time protection capability while still achieving resource efficiency through the shared auxiliary voltage source.
3Reliability
If multiple detection circuits operate in the same switching period, then detection speed and protection reliability are improved, but device complexity increases
Solution Approach 1:
The patent merges multiple detection functions into a unified detection system that operates within the same switching period. By combining temperature detection, output voltage detection, and input voltage detection circuits that all draw from the shared auxiliary winding voltage, the patent achieves simultaneous multi-parameter monitoring without proportionally increasing overall system complexity. The detection circuits are integrated into the existing power supply control architecture.
Solution Approach 2:
The patent uses universal detection circuit designs that can handle multiple detection scenarios. The auxiliary winding and voltage division circuit serve multiple detection circuits simultaneously, providing a multi-functional platform that reduces the need for separate dedicated components for each detection function, thereby limiting the increase in overall device complexity despite enabling simultaneous multi-parameter detection.
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
Enables simultaneous execution of over-temperature and over-voltage detection, along with reverse current detection, in a single switching period, enhancing the reliability and efficiency of power supply monitoring.
Implementation Method 1
an auxiliary winding senses a winding voltage of a switching power supply and obtains an auxiliary side voltage
Implementation Method 2
The second impedance element includes a thermistor
Data Source
AI summary
The present application provides method and circuit for monitoring a power supply, which firstly obtains an auxiliary side voltage from a switching power supply and then adopts a divided voltage circuit to obtain a divided voltage from the auxiliary side voltage, for detecting the divided voltage and a detected current flowed in the detection circuit with adopting a first detection circuit and a second detection circuit in an switch circuit to correspondingly generate a first and a second detection signals, which is corresponding to an ambient temperature and an output voltage of the power supply. Hereby, the power supply is monitored.