Flyback Power Supply With Discharge Control Circuit
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Solution Overview
Problem
Existing power supplies based on fly-back technology lack the ability to provide multiple separated power outlets with efficient power regulation and noise reduction, especially in applications requiring precise voltage and current control.
Innovation Solution
A power supply system with a transformer having a primary and secondary winding, where one of the lines connected to the primary winding is further connected to a discharge control circuit, allowing for independent control of multiple power supplies through a microcontroller that measures voltage and current to regulate power levels and reduce noise, utilizing synchronous switching and digital filtration for efficient power management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional fly-back power regulation is used, then galvanic isolation is achieved, but multiple separated power outlets with independent control cannot be provided
Solution Approach 1:
The power supply system is divided into multiple independent power outlets (first power supply, second power supply, third power supply) that can be separately controlled. Each power outlet can be independently regulated through dedicated discharge circuits and control switches, allowing separate power distribution to different loads while sharing a common transformer and excitation circuit.
Solution Approach 2:
The single transformer with primary and secondary windings serves multiple functions: it provides galvanic isolation for the first power supply while simultaneously enabling direct connection for the second and third power supplies. The excitation circuit and discharge control circuit are designed to support multiple operating modes, allowing the same hardware to deliver different types of power regulation depending on which power outlet is being used.
2Adaptability or versatility
If multiple power supplies are connected to the primary winding, then power levels can be controlled independently, but noise increases
Solution Approach 1:
Synchronous switching is implemented where multiple switches (first electronic switch, second electronic switch, third electronic switch) are activated and deactivated in synchronized periodic cycles. This coordinated periodic action ensures that switching events across different power supplies occur at the same time, reducing electromagnetic interference and noise compared to asynchronous switching where switches operate at different times.
Solution Approach 2:
The control circuit incorporates feedback mechanisms by connecting measuring devices to monitor voltage and current at the power source. This feedback information is used by the control circuit to adjust the switching timing and duration, optimizing the operation to minimize noise generation while maintaining independent power level control for each outlet.
3Measurement precision
If voltage and current measurement is implemented, then precise power regulation is achieved, but device complexity increases
Solution Approach 1:
The measuring devices and control circuit are designed to serve multiple power supplies simultaneously. The same voltage measuring device (70) and current measuring devices (42, 44) monitor the power source, and the single control circuit (40) processes this information to regulate all three power supplies. This multi-functional design achieves precise power regulation without proportionally increasing complexity for each power outlet.
Solution Approach 2:
The control circuit automatically uses the measured voltage and current information to regulate power distribution across all outlets without requiring external intervention. The system self-adjusts by processing the measurement data internally and controlling the respective switches and discharge circuits, eliminating the need for separate complex control systems for each power supply.
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 system achieves efficient power regulation with galvanic isolation for one power supply and precise voltage control for others, reducing noise and power consumption while enabling independent operation of multiple power supplies, suitable for applications like measuring systems and LCD backlighting.
Implementation Method 1
a transformer, which transformer comprises at least one primary winding and at least one secondary winding
Implementation Method 2
The power supply (2) comprises a voltage measuring device (70), which output is fed to the control circuit (40)
Data Source
Figure 1~2
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AI summary
The present invention relates to a power supply and a method for operating the power supply comprising a transformer connected to an excitation circuit which is adapted to be connected to a power source, which secondary winding is connected to at least one first power supply. From prior art is switch mode power supply based on fly back technology well known. It is an object of the pending application to a power supply with a power inlet with a plurality of separated power outlets. The object can be fulfilled if one of the lines connected to the primary winding is further connected to a discharge control circuit, which discharge control circuit is further connected to at least one second power supply. In the pending application the primary winding is further connected to a discharge circuit where at least one further power supply is connected.