Power Supply Feedback Circuit Control for Overcurrent Protection
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Solution Overview
Problem
Conventional power supply devices experience malfunctions due to accidental participation of the feedback compensation circuit in the overcurrent protection mechanism, leading to output voltage fluctuations.
Innovation Solution
A power supply device design that includes a control circuit to selectively enable or disable the linear optical coupler and voltage regulator in the feedback compensation circuit, preventing participation in overcurrent protection and stabilizing the output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the feedback compensation circuit is always enabled to maintain output stability, then the output voltage remains stable under normal conditions, but the circuit causes malfunction during overcurrent protection events
Solution Approach 1:
The feedback compensation circuit is made dynamically controllable through a control signal that enables or disables it based on operating conditions. The control circuit receives overcurrent protection signals and adjusts the feedback circuit's operational state accordingly, allowing the system to adapt between normal operation and protection modes.
Solution Approach 2:
The control circuit is configured to disable the feedback compensation circuit in advance when an overcurrent protection event is detected, preventing the malfunction before it occurs. This preliminary action ensures that the feedback circuit does not interfere with the overcurrent protection mechanism.
2Reliability
If the feedback compensation circuit operates during overcurrent protection, then voltage regulation is maintained, but output voltage fluctuates due to circuit interference
Solution Approach 1:
The feedback compensation circuit is temporarily extracted or disconnected from the operational system during overcurrent protection events. The control circuit isolates this circuit component when protection is needed, eliminating its interfering effect on the voltage regulation while preserving its normal voltage stabilization function during regular operation.
3Reliability
If a control mechanism is added to manage feedback circuit operation, then overcurrent protection malfunction is eliminated, but device complexity increases
Solution Approach 1:
The control circuit performs multiple functions: it monitors overcurrent conditions, generates protection signals, and manages the feedback compensation circuit's operational state. By making the control circuit multi-functional, the patent avoids adding separate dedicated control components, thereby limiting the increase in overall device complexity.
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 eliminates overcurrent protection malfunctions and improves output stability by preventing the feedback compensation circuit from interfering with overcurrent protection, ensuring consistent voltage delivery.
Implementation Method 1
The first transformer includes a first main coil and a first secondary coil. The first main coil receives an input voltage. The first secondary coil generates an induced voltage.
Implementation Method 2
The feedback compensation circuit includes a linear optical coupler and a voltage regulator.
Data Source
AI summary
A power supply device for eliminating overcurrent protection malfunctions includes a first transformer, a power switch element, an output stage circuit, a detection circuit, a feedback compensation circuit, a PWM (Pulse Width Modulation) IC (Integrated Circuit), a second transformer, and a control circuit. The first transformer generates an induced voltage according to an input voltage. The output stage circuit generates an output current according to the induced voltage. The detection circuit monitors the output current and generates a detection voltage according to the output current. The feedback compensation circuit includes a linear optical coupler and a voltage regulator. The feedback compensation circuit generates a coupling current. The second transformer generates a control voltage according to the coupling current. The control circuit selectively enables or disables the linear optical coupler and the voltage regulator according to the detection voltage and the control voltage.