Power Supply Device Voltage Fluctuation Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Switching regulator power supply devices experience voltage fluctuations due to load changes on the insulated side, leading to instability, as they rely on voltage feedback from secondary windings and struggle to compensate for changes in input current effectively.
Innovation Solution
A power supply device with an adjustment amount generation device that generates an adjustment current to counteract changes in output voltage, coupled with a control device that controls a switch based on the primary winding current, secondary winding voltage, and the adjustment current, to maintain a stable voltage across the load.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If voltage feedback using secondary windings is used to produce non-insulated and insulated output voltages, then the power supply device can provide both insulated and non-insulated outputs, but the output voltage fluctuates due to load changes on the insulated side
Solution Approach 1:
The patent divides the control of load compensation current into two independent parts: one controlled by the non-insulated output voltage feedback and another by the insulated output voltage feedback. This segmentation allows each output to be compensated independently, resolving the conflict between providing dual outputs and maintaining voltage stability.
Solution Approach 2:
The patent implements dual feedback loops where the non-insulated output voltage and insulated output voltage are separately detected and fed back to the control circuit. This feedback mechanism enables the control circuit to adjust the primary winding current accordingly, maintaining output voltage stability despite load changes on either side.
2Reliability
If input current detection and compensation control is implemented, then the power supply can compensate for current changes, but the system becomes unstable due to changes in power supply voltage
Solution Approach 1:
The patent uses output voltage feedback instead of relying solely on input current detection. By detecting the actual output voltage and feeding it back to the control circuit, the system can compensate for various disturbances including power supply voltage changes, improving both reliability and stability.
Solution Approach 2:
The patent replaces direct input current detection and control with an output voltage-based control mechanism. This substitution allows the system to indirectly manage input current through output voltage regulation, achieving better stability under varying power supply conditions.
3Device complexity
If a simple adjustment method is used to suppress fluctuations, then the device complexity is reduced, but the ability to effectively counteract input voltage changes may be compromised
Solution Approach 1:
The patent employs operational amplifiers that automatically adjust the primary winding current based on the detected output voltage deviations. This self-service mechanism eliminates the need for complex external control circuits while maintaining effective fluctuation suppression through automatic voltage regulation.
Solution Approach 2:
The patent replaces complex multiplication circuits with operational amplifier-based voltage regulation. The operational amplifiers perform the necessary signal processing and control functions through voltage comparison and amplification, achieving effective fluctuation suppression with simpler circuitry.
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 the impact of input voltage changes on the load compensation current, stabilizing the output voltage and improving the power supply's stability by using a simple adjustment method that suppresses fluctuations without requiring multiplication circuits.
Implementation Method 1
an insulating transformer including a primary winding connected to a power supply, a secondary winding connected to a load, and a secondary winding which is electromagnetically coupled with the primary winding and the secondary winding
Data Source
AI summary
A power supply device includes a primary winding and at least a first secondary winding connected to a load, a power supply to which the primary winding is connected, a switch configured to adjust a first current flowing through the primary winding, an adjustment amount generation device and a control device. The adjustment amount generation device is configured to generate an adjustment amount to reduce a change in the first current depending at least in part on a change in an output voltage of the power supply supplied to the load. The control device is configured to control the switch based at least in part on the first current, a voltage produced in secondary winding, and the adjustment amount.