Power Supply Apparatus Dual Feedback Overvoltage Protection
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Solution Overview
Problem
Existing power supply circuits face issues with redundant feedback circuits, unnoticed overvoltage protection failures, increased component variations affecting output voltage accuracy, and the need for additional components for inspection, leading to inefficiencies and safety concerns.
Innovation Solution
A power supply apparatus with a transformer, switch element, and dual feedback parts that allow for monitoring and control of output voltage, enabling the use of either a first or second target voltage for feedback, and integrating overvoltage protection to ensure safe operation and reduce component variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a sub-loop control circuit is added as an overvoltage protection circuit, then the power supply circuit can be protected more safely, but the device complexity increases and redundant feedback circuits are created
Solution Approach 1:
The patent combines the overvoltage protection function with the normal feedback control circuit by having the same feedback circuit serve dual purposes: normal voltage regulation and overvoltage protection. This eliminates the need for a separate sub-loop control circuit while maintaining protection functionality.
Solution Approach 2:
The feedback control circuit is designed to perform multiple functions: it acts as the normal feedback loop for voltage regulation and simultaneously serves as the overvoltage protection circuit. This multi-functionality reduces component redundancy and simplifies the overall circuit structure.
2Ease of operation
If additional components are added for inspection, then the overvoltage protection operation can be tested, but the device complexity and component variations increase
Solution Approach 1:
The feedback control circuit monitors and controls its own operation, including detecting overvoltage conditions and activating protection mechanisms without requiring external inspection components. This self-monitoring capability eliminates the need for additional inspection components.
3Device complexity
If the feedback circuit is used for both normal control and overvoltage protection, then the device complexity is reduced, but the measurement precision for output voltage control may be affected
Solution Approach 1:
The feedback control circuit dynamically switches between normal voltage regulation mode and overvoltage protection mode based on operating conditions. This dynamic operation allows the same circuit to maintain precision in normal operation while providing protection when needed.
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
This solution allows for effective monitoring of both primary and spare feedback circuits, reducing redundancy and component variations, enhancing safety and efficiency by ensuring continuous overvoltage protection and accurate output voltage control.
Implementation Method 1
a transformer (T101) having a primary side and a secondary side which are insulated from the primary side
Implementation Method 2
a light emission amount of an LED part of a photocoupler PC101
Implementation Method 3
a phototransistor part corresponding to the light emission amount of the LED part
Data Source
AI summary
The power supply apparatus includes a transformer having a primary side and a secondary side insulated from each other, a switch element for switching current flowing in the primary side of the transformer, a control part configured to control an operation of the switch element, and two feedback parts configured to detect an output voltage from the transformer so as to output, to the control part, a detection signal in accordance with the output voltage for feedback to the primary side of the transformer.