What is the difference between non-isolated flyback switching power supplies and isolated switched-mode power supplies.
There is no transformer in the non-isolated circuit.
The so-called forward and the flyback is very good, the flyback transformer has energy storage, transformer primary and secondary with the same name on the contrary, drive signal conduction, primary conduction, secondary cut-off, energy storage; drive signal cut-off, primary Cut off, secondary conduction, pass. While the forward transformer is no energy storage, and the primary and secondary are in phase
This question can be divided into several phrases to distinguish:
Non-isolated: The power input and output are electrically connected. As shown below:
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Isolated: The power input and output are independent of each other in the electrical structure and are connected only by transformers (magnetically coupled) and optocoupler (optocoupler) devices.
Forward-pulse transformer phase / edge relationship, to ensure that the switch tube conduction, drive the primary transformer pulse transformer, while the transformer side of the load power supply.
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Flyback type: flyback circuit and the forward circuit is the opposite, the original transformer transformer / phase relationship, to ensure that when the switch is turned on, driving the pulse transformer primary side, the transformer side does not load the power supply, that is, Side staggered off.
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Switching power supply: the use of modern power electronics technology to control the switch on and off the time ratio, to maintain a stable output voltage of a power supply, switching power supply is generally composed of pulse width modulation (PWM) control IC and MOSFET.
Although the optocoupler is also a way to isolate, but in the switching power supply are generally speaking of the voltage isolation. Two isolation is different: the role of optocoupler is mainly to prevent the back of the DC high voltage feedback to the control circuit in the burn control circuit; isolation transformer role: 1, play a role in isolation 2, from the role of filtering; The role of pressure
