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# 小功率稳压器原理-西安稳压器原理

In some low-power single-phase electrical equipment, the supply voltage is often required to be stable to work well, but often the mains voltage has a 10% fluctuation, and sometimes exceeds this fluctuation. To do this, we need an AC voltage regulator to provide a stable supply voltage for these devices. Here I will discuss the working principle of the L and C series regulated power supplies. L, C series AC regulated power supply circuit. It uses the principle of magnetic saturation to stabilize the voltage. We know that ferromagnetic materials such as the core of the coil L of the voltage regulator - silicon steel sheet, have a magnetization curve, called BH curve (H is the magnetic field strength, B is the induction intensity) as shown in Figure WY-2, from the curve It can be seen that B increases rapidly when H is increased by O. When H>HM, H increases B substantially, which is called magnetic saturation. If this magnetic material is used as the core of coil L, then give L through different AC current I, then the voltage U curve across L will change, when I is greater than a certain value (IM), the iron core enters saturation state, I continues to increase from basically unchanged, so we If the current of the coil is selected at I>2~4IM, a better stable output voltage can be obtained. Now let's see how AC power works. Since the circuit is made up of L and C in series, since the impedances of C and L cancel each other out, their total impedance is equal to Z total = LR-CR. Therefore, the current flowing through the coil L increases, and the capacitor C is appropriately selected. The value of L and L is such that the current flowing through L is equal to about 4IM and the voltage on L is equal to the required voltage. At this time, the iron core will reach a certain saturation depth, and the current reflected in the LC series circuit when the power supply voltage changes also Will change, but to U> HM (I> IM), the output voltage is basically unchanged, at this time the voltage across the capacitor C can reach more than 400 volts. Why is this? This is because the impedance of C to 50HZ AC power supply is a certain value, and the voltage across it is equal to the product of current I and capacitive reactance ZC flowing through it. UC=I*ZC increases the current flowing through C due to the addition of coil L. Therefore, UC is of course also increased. For example, if the capacitance is 6UF, the capacitive reactance is ZC=1/2πFC=530E. If it is directly connected to the 220V AC power supply, the current is IC=220/530=0.4A. . Due to the addition of L, the current flowing through C is increased to 0.8 amps, at which time the voltage across the capacitor is UC = 530 * 0.8 = 424 volts. It can be seen that the voltage at both ends of the C-L series AC stabilized power supply C is relatively high, and the capacitor with a withstand voltage of 600V or more is selected when the capacitor is selected.

关键词： 小功率稳压器原理-西安稳压器原理
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