ABB 5SHX2645L0002 可控硅模块

5SHX2645L0002额定通态平均电流在一定条件下，阳极—阴极间可以连续通过的50赫兹正弦半波电流的平均值。5SHX2645L0002正向阻断峰值电压在控制极开路未加触发信号，阳极正向电压还未超过导能电压时，可以重复加在可控硅两端的正向峰值电压。可控硅承受的正向电压峰值，不能超过手册给出的这个参数值。5SHX2645L0002反向阴断峰值电压当可控硅加反向电压，处于反向关断状态时，5SHX0660F0002可以重复加在可控硅两端的反向峰值电压。使用时，不能超过手册给出的这个参数值。 控制极触发电流在规定的环境温度下，阳极—阴极间加一定电压，使可控硅从关断状态转为导通状态所需要的小控制极电流和电压。维持电流在规定温度下，控制极断路，维持可控硅导通所必需的小阳极正向电流。5SHX0660F0002采用可控硅技术对照明系统进行控制具有：电压调节速度快，精度高，可分时段实时调整，有稳压作用，采用电子元件，5SHX0660F0002相对来说体积小、重量轻低。但该调压方式存在一致命缺陷，由于斩波，使电压无法实现正弦波输出，还会出现大量谐波，形成对电网系统谐波污染危害，不能用在有电容补偿电路中。

现代照明设计要求规定，照明系统中功率因数必须达到0.9以上，而气体放电灯的功率因数在一般在0.5以下，所以都设计用电容补偿功率因数在国外发达，已有明文规定对电气设备谐波含量的限制，在国内，北京、上海、广州等大城市，5SHX0660F0002已对谐波含量超标的设备限制并入电网使用。采用可控硅技术对照明系统进行照度控制时，可通过加装滤波设备来有效降低谐波污染。近年来，许多新可控硅元件相继问世，如适于高频应用的快速可控硅，可以用正或负的触发信号控制两个方向导通的双向可控硅，5SHX0660F0002可以用正触发信号使其导通，用负触发信号使其关断的可控硅等等。5SHX0660F0002可控硅调光器是目前舞台照明、环境照明领域的主流设备。5SHX0660F0002在照明系统中使用的各种调光器实质上就是一个交流调压器，老式的变压器和变阻器调光是采用调节电压或电流的幅度来实现的，如下图所示。u1是未经调压的220V交流电的波形，5SHX0660F0002经调压后的电压波形为u2，由于其幅度小于u1，使灯光变暗。在这种调光模式中，虽然改变了正弦交流电的幅值，5SHX0660F0002但并未改变其正弦波形的本质。

5SHX2645L0002 is the average value of a 50 Hz sinusoidal half wave current that can continuously pass between the anode and cathode under certain conditions. The forward blocking peak voltage of 5SHX2645L0002 can be repeatedly applied to the two ends of the thyristor when the control pole is open without triggering a signal and the anode forward voltage has not exceeded the conduction voltage. The peak forward voltage borne by the thyristor cannot exceed the parameter value given in the manual. 5SHX2645L0002 reverse peak voltage: When the thyristor is in reverse off state with reverse voltage applied, 5SHX0660F0002 can repeatedly apply the reverse peak voltage at both ends of the thyristor. When using, the parameter value given in the manual cannot be exceeded. The small control pole current and voltage required to switch the thyristor from off state to on state by applying a certain voltage between the anode and cathode at the specified ambient temperature. Maintain the current at the specified temperature, control the pole to break, and maintain the necessary small anode forward current for thyristor conduction. 5SHX0660F0002 uses thyristor technology to control the lighting system, which has the advantages of fast voltage regulation speed, high accuracy, real-time adjustment in different time periods, voltage stabilization effect, and the use of electronic components. 5SHX0660F0002 is relatively small in size and lightweight. However, this voltage regulation method has a fatal flaw. Due to chopping, the voltage cannot achieve sine wave output, and a large number of harmonics will appear, which poses a threat to harmonic pollution in the power grid system and cannot be used in circuits with capacitor compensation.

Modern lighting design requirements stipulate that the power factor in lighting systems must reach 0.9 or above, while the power factor of gas discharge lamps is generally below 0.5. Therefore, capacitor compensation power factor is designed in developed countries, and there are explicit regulations on the harmonic content of electrical equipment. In large cities such as Beijing, Shanghai, and Guangzhou in China, 5SHX0660F0002 has restricted the integration of equipment with excessive harmonic content into the power grid. When using thyristor technology to control the illumination of lighting systems, harmonic pollution can be effectively reduced by installing filtering equipment. In recent years, many new thyristor components have emerged, such as fast thyristors suitable for high-frequency applications, bidirectional thyristors that can be controlled to conduct in two directions with positive or negative trigger signals, 5SHX0660F0002 thyristors that can be turned on with positive trigger signals, thyristors that can be turned off with negative trigger signals, and so on. 5SHX0660F0002 thyristor dimmer is currently the mainstream equipment in the field of stage lighting and environmental lighting. The various dimmers used in the lighting system, 5SHX0660F0002, are essentially AC voltage regulators. The old-fashioned transformers and varistors achieve dimming by adjusting the amplitude of voltage or current, as shown in the following figure. U1 is the waveform of 220V AC without voltage regulation, and the voltage waveform of 5SHX0660F0002 after voltage regulation is u2. Due to its amplitude being smaller than u1, the light becomes dim. In this dimming mode, although the amplitude of the sinusoidal alternating current is changed, 5SHX0660F0002 does not alter the essence of its sinusoidal waveform.