Flyback Converter diode is acting like a switch linking the transformer secondary and the load. When the primary switch is … Flyback Diode Voltage and Current AnalysisRead more
Quasi Resonant Flyback
Transformer Design and Selection QR Flyback
Several factors to consider in order to perfectly arrived a good Quasi Resonant Flyback transformer design. It needs to consider … Transformer Design and Selection QR FlybackRead more
How to Derive QR Flyback Secondary Current
The key to deriving the current levels of every switching converter knows the type of waveforms. For flyback converter, the … How to Derive QR Flyback Secondary CurrentRead more
Quasi Resonant Flyback Primary Current Derivation
In order to derive the primary current of a Quasi resonant flyback, it is important to know the waveform of … Quasi Resonant Flyback Primary Current DerivationRead more
Quasi Resonant Flyback Transformer Saturation Analysis
One of the very important aspect to look at in dealing with quasi resonant flyback transformer is the saturation. A quasi-resonant flyback transformer is not actually a transformer that we usually know. A transformer will transfer energy from the primary to the secondary at real time. However, the flyback converter will store energy on the primary and then transfer that energy to the secondary somehow. This action makes a flyback transformer prone to saturation if not properly been designed.
Quasi Resonant Flyback Duty Cycle Derivation
Quasi Resonant flyback duty cycle will reach maximum when it operates in the transition mode or boundary region. However, as long as the operation will stay at the discontinues mode (DCM), that is the desired region of operation, the Quasi resonant flyback duty cycle will be variable.
Quasi Resonant Flyback Step by Step Design Guide
If you want to make a quasi resonant flyback but do not know where to start, therefore this Quasi Resonant Flyback Step by Step Design Guide is perfect for you. Follow below steps.
Quasi Resonant Flyback Operating Modes
Each of the quasi resonant flyback operating modes discussed above has its strength and weaknesses. It is up to the designer to which mode to select. In my personal experience, I already used both the DCM and TM operating modes. Basically, a quasi resonant flyback will operate in DCM at light load and approaches to TM at very heavy load. During the design stage, the designer will set the operating point in first valley switching for heavier loads for optimum performance.
How Quasi Resonant Flyback Works – Detailed Operation
A quasi resonant flyback converter is a variant of flyback converter wherein it makes use of the parasitic elements to partially resemble a resonance action. According to dictionary, the word quasi could mean partly, partially, comparatively or relatively. So, a quasi-resonance means a partial resonance, not a total resonance. At light load, Quasi resonant flyback operation will be in DCM. However, it will come closer to the boundary or transition mode while in full load.