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Talking about the current power semiconductor application
Source：Shenzhen Yushuoxin Electronic Co., LtdTime：2017-02-28
Switching
power supply application of semiconductor devices on and off tasks,
power semiconductor applications and to open and close the time to grasp
the input voltage up and down, because its usual task in the 20KHz or
more switching frequency task, switching power supply dv / dt, didt Is
large, and the radiated energy of the differential mode current is
gradually "transferred" toward the side of the printed circuit board as
the frequency increases, because the increase in frequency causes the
electrical dimension of the ground-to-phase relative to the differential
mode current signal to become large The radiation field of the printed circuit loop is more reflective. More importantly, as the closed printed circuit loop changes from
square to sudden, more and more narrow rectangles, bad bursts of major
surge voltages, inrush currents, and other noise.
In recent years, under normal circumstances, the power semiconductor application 1 ÷ 8 divider input signal makes the power MOSFET conduction, if the fault occurs, its input signal makes the power MOSFET off, and it starts counting itself, the first cycle, Power MOSFET turns on. If not eliminated, this rule cycle up; if the failure to eliminate, then enter the normal task situation. The IC external transformer, AC-DC function to complete, different specifications of the transformer can achieve different DC voltage. With the maturity of consumer technology, has been able to low-voltage master unit and low-voltage high-power tube integrated into the same chip. TI, ON SemIConductor, Power, Integrations and other companies have similar products.
Power semiconductor applications in the country is simply a blank. Because the switching power supply in the volume, weight, effectiveness and reliability of the disadvantage, its research and development speed is amazing. Figure 1 is a typical diagram of the switching power supply and the noise of the loop, with a small amount of high harmonics noise through the closed loop to the spatial radiation of electromagnetic energy, that is, differential mode current convection interference. The shape of the usual closed loop is irregular.
In recent years, under normal circumstances, the power semiconductor application 1 ÷ 8 divider input signal makes the power MOSFET conduction, if the fault occurs, its input signal makes the power MOSFET off, and it starts counting itself, the first cycle, Power MOSFET turns on. If not eliminated, this rule cycle up; if the failure to eliminate, then enter the normal task situation. The IC external transformer, AC-DC function to complete, different specifications of the transformer can achieve different DC voltage. With the maturity of consumer technology, has been able to low-voltage master unit and low-voltage high-power tube integrated into the same chip. TI, ON SemIConductor, Power, Integrations and other companies have similar products.
Power semiconductor applications in the country is simply a blank. Because the switching power supply in the volume, weight, effectiveness and reliability of the disadvantage, its research and development speed is amazing. Figure 1 is a typical diagram of the switching power supply and the noise of the loop, with a small amount of high harmonics noise through the closed loop to the spatial radiation of electromagnetic energy, that is, differential mode current convection interference. The shape of the usual closed loop is irregular.
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