Flyback Converter OVP Control Using Dynamic Current Detection
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Solution Overview
Problem
Conventional flyback converters have a fixed over-voltage protection (OVP) mechanism that constantly consumes power, which is inefficient and does not meet stringent energy-saving requirements for modern electronic devices.
Innovation Solution
A flyback converter with improved OVP functionality that includes a primary winding, secondary winding, primary side regulating controller, auxiliary winding, external detection circuit, internal detection circuit, and a switching device, which dynamically detects current values to enable or disable the OVP circuit using a current mirror and buffer to regulate current flow and reduce power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a constant detection mode is used for over-voltage protection, then the protection reliability is improved, but the energy consumption increases
Solution Approach 1:
The patent implements a dynamic detection mode that switches between active detection and idle states based on operating conditions. The controller activates the detection circuit only when necessary (during startup or when voltage anomalies are detected), rather than maintaining constant monitoring, thereby reducing energy consumption while preserving protection reliability when needed.
Solution Approach 2:
The detection circuit operates periodically rather than continuously, with the controller checking voltage conditions at specific intervals or triggered by specific events. This periodic operation reduces the average power consumption of the detection circuit while ensuring that over-voltage conditions are detected when they occur.
2Device complexity
If a fixed voltage protection point is used, then the circuit simplicity is improved, but the adaptability to different energy-saving standards deteriorates
Solution Approach 1:
The patent enables dynamic adjustment of the voltage protection threshold based on different operating modes and energy-saving requirements. The controller can modify the protection point voltage level according to the detected operating conditions, allowing the same circuit to adapt to different energy-saving standards without requiring multiple fixed-threshold circuits.
Solution Approach 2:
The detection circuit is designed to serve multiple functions: it can operate with different protection thresholds for different energy-saving standards, handle both startup and runtime protection, and adapt to various operating conditions. This multi-functionality allows a single circuit design to meet diverse regulatory requirements.
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
The solution effectively reduces power consumption by dynamically activating the OVP circuit only when necessary, enhancing energy efficiency and meeting stringent green energy standards for electronic devices.
Implementation Method 1
an auxiliary winding coupled to the primary winding and arranged to provide electric power to the primary side regulating controller
Implementation Method 2
a primary winding arranged to receive an input voltage; a switching device connected to the primary winding and the primary side regulating controller to receive on/off signals
Data Source
AI summary
A flyback converter with improved over-voltage protection (OVP) functionality, which includes a primary winding arranged to receive an input voltage, a secondary winding coupled to the primary winding and connected to a rectifier circuit to generate DC output voltage, a primary side regulating controller, an auxiliary winding arranged to provide electric power to the primary side regulating controller, an external detection circuit connected between the auxiliary winding and the primary side regulating controller, an internal detection circuit arranged inside the primary side regulating controller and coupled to the external detection circuit by detecting the current value flowing through the external detection circuit and comparing it with a predetermined current value of the internal detection circuit to enable or disable an OVP circuit to protect the primary side regulating controller, and a switching device arranged to receive on/off signals generated for regulating current flowing through the primary winding.