Today saw the day of the power principle,
220V mains --- primary and secondary EMI filter --- rectifier bridge --- high voltage filter (high voltage direct current) --- switch (high frequency pulse high voltage direct current) --- transformer (low voltage alternating current) --- Rectifier filter (low voltage DC output)
But after I demolished a power supply, the high-voltage filter capacitor is followed by three switching transistor, then the transformer, then there are three switches and three tubes, and finally only the coil and capacitor circuit composed of the filter. The Expert help me explain how the process is achieved. The
After the transformer is not a switch transistor, although the shape like, but in fact is the rectifier diode. Switching power supply process you are very right ah
It is rectifier tube, another transformer secondary side current and voltage is positive, so that pulsating DC, not the exchange of
Simply put it
220V mains --- one, two EMI filter --- rectifier bridge --- high voltage filter (high voltage direct current) to the back of the time should be connected to the transformer, and switch tube. This time is DC, but through the switch tube repeated Turn on, and after the end of the input transformer is pulsating DC.
You should know that the alternating current can produce alternating magnetic fields, so the transformer is not used for smooth DC, so the current through the transformer is alternating current, or pulsating direct current, so the back will be added rectifier filter circuit
Alternating current.
AC power through the transformer or AC, transformers and generators, like the use of the principle of electromagnetic induction to achieve the purpose of voltage conversion.
But in life, the radio power output is DC, which is because after the transformer buck after the alternating current from the power supply in the rectifier circuit and filter circuit into DC. Generally between 3-9V.
Alternating current (alternating ≈lt?r?ne?t) current [k?r?nt, k?r-]), referred to as AC. AC also known as "alternating current", referred to as "exchange". Generally refers to the size and direction of time with the periodic changes in the voltage or current. Its most basic form is sinusoidal current.
