< a href = "http://www.smartbillion.com.hk" target = "_blank" > < / a > toggle switch manufacturer introduce circuit connection mode: Tossed-switch almost in all electronic circuits, semiconductor diodes are used, it plays an important role in many circuits, it is one of the earliest semiconductor devices, its application is also very wide, the crystal diode is a p-n junction formed by P-type semiconductor and N-type semiconductor, the space charge layer is formed on both sides of the interface, and has a self-built electric field. When there is no applied voltage, the diffusion current caused by the difference of carrier concentration on both sides of the p-n junction and the drift current caused by the self-built electric field are equal and in electric equilibrium.
Toggle switch diode switch circuit to use diode, because the switching speed of the ordinary diode is not high enough, so the diode used in this switching circuit for the special switching diode is shown as the equivalent circuit of the switching diode, from the figure can be seen, at this time the switching diode in equivalent to a switch Sl at the same time, there are two resistors.
The switch Sl in the equivalent circuit can be considered as an ideal switch, that is, its on-resistance is small to zero, and its on-resistance is large to infinity.
According to the way the switching device is connected in the circuit, the switching power supply that is widely used at present can be broadly divided into: series switching power supply, parallel switching power supply, transformer switching power supply and other three categories.
Among them, the transformer switching power supply (hereinafter referred to as the transformer switching power supply) can also be further divided into: push-pull type, half bridge type, full bridge type and so on; According to the phase of the excitation and output voltage of the transformer, it can be divided into: forward type, flyback type, single type and double type.
If it is divided from the use, it can also be divided into more types of series switching power supply disadvantage is that the input and output share a ground, therefore, it is easy to produce EMI interference and the floor is charged, when the input voltage is the mains rectifier output voltage, it is easy to cause electric shock, and it is not safe for the person.
