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小功率稳压器原理-西安稳压器原理

来源:未知 浏览次数: 日期:2018-07-11 15:39
小功率稳压器原理-西安稳压器原理
小功率稳压器原理-西安稳压器原理

在一些小功率的单相用电设备中,往往要求供电电压稳定才能很好地工作,但往往市电电压都存在着10%的波动,有时还超过此波动值。为此就需要一个交流稳压器对这些设备提供稳定的供电电压,在这里我和大家讨论一下L、C串联稳压电源的工作原理。 L、C串联型交流稳压电源电路。它是利用磁饱和原理来稳定电压的。我们知道铁磁材料如稳压器的线圈L的铁芯---硅钢片,都有一条磁化曲线,称B-H曲线(H是磁场强度,B是感应强度)如图WY-2,从曲线上可看出来,当H由O增加时B增加很快,当H>HM时H再增加B基本上不变,这就叫磁饱和,如果用这种磁材料做线圈L的铁芯,再给L通以不同的交流电流I,则L两端的电压U曲线将随着变化,当I大于某一个值(IM)时铁芯进入饱和状态,I的继续增大从基本上不变,因此我们如将线圈的电流选在I>2~4IM处就可获得较好的稳定的输出电压。 现在来看交流电源是如何工作的。由于电路由L和C串联而成,因C和L的阻抗是相互抵消的,所以它们的总阻抗等于Z总=LR-CR,因此,流过线圈L的电流增大,适当选配电容C和L的数值使得流过L的电流等于4IM左右且使L上的电压等于所需的电压,这时铁芯将达到一定的饱和深度,当电源电压发生变化时反映在L-C串联电路的电流也会变化,但是要U>HM(I>IM)则输出电压基本不变,此时电容C两端的电压可达400多伏左右。这是为什么呢?这是因为C对50HZ交流电源的阻抗是一定值,其两端的电压等于流过它的电流I和容抗ZC的乘积,UC=I*ZC由于线圈L的加入,使流过C的电流增加,所以UC当然也增加了,举个例子设电容为6UF,则容抗为ZC=1/2πFC=530欧,如果直接接入220伏交流电源上,则电流为IC=220/530=0.4安。由于L的加入,使流过C的电流增至0.8安,此时电容两端的电压UC=530*0.8=424伏。可见这种C-L串联式交流稳压电源C两端的电压是较高的,选用电容时要选用耐压为600V以上的电容。
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.


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 关键词: 小功率稳压器原理-西安稳压器原理

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