Lcd switch source resolution. Hey, everybody, let's talk about the switch on lcd tv today。
Let's take a look at this, an imported 65-inch lcd television, which is built internally, power panels, main boards, and which has no geologic panels, and which comes directly to the edge of the screen from two lines out of the main plate, so it can only be replaced by a single original screen. It looks like a very simple set of two circuit boards。
Today, let's talk about its power panels, which are also called power switches. We have basically all the domestic appliances around us, so long as there's a circuit board that turns communication into direct current, we call it a switch。
Why do you call it a switch
Let's take a look at this circuit map, which is the basic working principle of the switch. First of all, direct current 220 volts exchange through the entire bridge, and then straight currents through the transformer's primary circuit, to the switch
When there is an out-of-date online loop in the primary circuit, an induction electric mode is created and an induction voltage is generated in the transformer. The secondary sensor voltage can be used by the load once it's filtrated through the current of the diode
But there's a huge problem here, because if the switch closes for a long time, because the electrical resistance of the wire is small enough for straight currents to burn the transformer quickly。
Theoretically, if we can control the switch's switch or switch's frequency and the time it opens or closes, we can control the output of secondary voltage。
In practical applications, the switch can be very high at a second switch frequency as many as tens of thousands or even hundreds of thousands. So it's not possible for this switch to use the traditional mechanical switch only electronics。
For example, the high power mos tube or long effect tube, because the power pipe in the power segment is always working on the switch, we are accustomed to calling this circuit structure a switch
Now, let's look at this power panel here in physical form, which is 220 volt input end and 220 volts coming in, and this is the mutual sense filter, and this is the whole of the bridge, because it's more powerful, so he's using two whole bridges。
The combination of these two whole currents is their circuit map, which is the basic working principle of the power switch that turns high-voltage direct currents into controlled low-voltage direct currents。
This panel looks complicated, but his method of judging is simple
