Switching Power Supply Abnormality Detection Circuit
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Solution Overview
Problem
Existing power supply systems face challenges in detecting abnormalities, such as overheating and overvoltage, with increased circuit complexity, which complicates safety and efficiency.
Innovation Solution
A power supply system with a reduced circuit scale that incorporates a control IC and abnormality detection circuits, including heating and overvoltage detection, using photo-couplers and transistors to differentiate between switching signals and abnormality signals, allowing for efficient mode switching and safety inhibition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an abnormality detection circuit is provided to detect abnormalities in the switching power supply, then the reliability of the power supply system is improved, but the device complexity increases due to increased circuit scale
Solution Approach 1:
The control IC is designed to perform multiple functions: it controls the semiconductor switching element and simultaneously detects abnormalities through the operation control signal. The single circuit integrates both control and detection functions, eliminating the need for a separate dedicated abnormality detection circuit while maintaining comprehensive monitoring capability.
Solution Approach 2:
The abnormality detection function is merged with the existing control IC and control signal path. The operation control signal that already exists for controlling the switching element is also used to detect abnormalities, combining two functions into a single integrated system rather than adding separate components.
2Ease of manufacture
If the circuit scale is reduced to minimize device complexity, then the ease of manufacture is improved, but the measurement precision of abnormality detection may deteriorate
Solution Approach 1:
The operation control signal acts as an intermediary that carries information about both normal control operations and abnormal conditions. By monitoring changes in this existing signal, the system achieves accurate abnormality detection without requiring additional sensing circuits, maintaining detection precision while keeping the circuit simple.
Solution Approach 2:
The control IC monitors its own operation control signal to detect abnormalities, using the system's existing control mechanism for self-diagnosis. This self-monitoring approach eliminates the need for separate detection circuits while maintaining accurate abnormality detection capability.
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 effective detection of switching power supply abnormalities with a compact circuit design, ensuring user safety and efficient operation by distinguishing between normal and abnormal conditions.
Implementation Method 1
using photo-couplers and transistors to differentiate between switching signals and abnormality signals
Data Source
AI summary
A power supply system includes: a switching power supply configured to output a direct current; a control circuit configured to output a switching signal; an abnormality detection circuit configured to output an abnormality signal; an operation control unit connected to the control circuit and the abnormality detection circuit and configured to output an operation control signal, and a power supply control circuit configured to, when a first operation control signal is input, switch a state of the switching power supply to an operation state or a stop state. The operation control unit outputs the first operation control signal to the power supply control circuit when the switching signal is input. The operation control unit outputs a second operation control signal to the power supply control circuit when the abnormality signal is input.