◎  三相半控整流移相触发器模块 (SX-JKB)

THREE PHASE HALF-CONTROLLED RECTIFICATION PHASE-SHIFT TRIGGER MODULE (SX-JKB)

◆  SX-JKB 在三相整流同步变压器模块 TB-3Z 的支持下, 即可实现三相半控整流电路输出直流电压的无级可调。

◆  With the support of the three phase rectification synchronous transformer module (TB-3Z), SX-JKB can continuously adjust the AC output voltage of the three phase half-controlled rectification circuit.

◎ 有关技术指标及应注意的问题

Related technical specifications and precautions

1. 三相交流调压电路无相序要求 , 但三相整流电路中三相进线 (R, S, T) 有相序要求 , 且进线和可控硅 ( 如 R 对应 KP1 的阳极和 KP4 的阴极 ), 同步变压器模块及三相触发器之间必须严格一一对应, 否则系统不能正常工作。

2. 三相触发器的触发端 ( 如 A1, G1, … …, A6, G6) 为强电触发方式, 可以触发1000A以内的任何单向可控硅.这里所谓的强电触发方式的连线为 A1, G1 对应 KP1 的阳极和门极 , 而不是通常的阴极和门极。

3. 四个应用电路中的电网线电压为 380VAC, 50Hz, 允许在 300~420VAC 范围内使用 . 如用户使用在低电压上 ( 需带全隔离降压变压器 ), 则需向我公司定制。

4.CON 对 COM 必须为正 , 如极性相反则输出端失控( 全开或全闭 ). 当控制端 CON 从 0~5V 改变时 , 交流负载上的电压从0V到最大值可调(对阻性负载而言).其中 CON 在 0~0.8V 左右时为全关闭区域 , 能可靠关断模块的输出 ; CON 在 0.8V~4.6V 左右为可调区域 , 即随着控制电压的增大 , 导通角 α 从 180°到 0°线性减小 , 交流负载上的电压从 0V 增大到最大值 ; CON 在4.6V~5V 左右时为全开通区域 , 交流负载上的电压为最大值 ( 接近电网电压 )。

5.CON 对 COM 的输入阻抗分 E, F 和 H 型均为大于等于 30KΩ; G 型为 250Ω. +5V 电压信号只提供给手控电位器用 , 不做他用 , 所选用的电位器阻值在 2~10KΩ间 , 注 : 4~20mA 的 G 型不能用电位器手动调节 , 此时+5V 端也没有用处。

6. 三相交流调压电路中三相功率应均衡。负载为 Y 形接法时，Y 的中心点可接、可不接中心线，但接中心线时高次谐波对电网干扰要比不接时大。同步变压器模块为TB-3A 上的 N 必须接地（中心线）。

7. 三相整流电路中 , 当输出端并联电解电容滤波时 , 由于电容两端电压不能突变 , 这种高电压 , 大容性场合很容易造成可控硅过流而损坏 , 因此模块上电前须保证控制端CON电压在 0V, 上电后 , CON须从 0V 逐渐增大 ,以保证电容冲击电流最小。

8. 三相交流异步电机的调速应采用变频器 , 只有风机类 ,水泵类电机在要求不高的场合可采用三相调压模块 . 三相电机软启动应采用电压 , 电流闭环控制 。

9. 三相触发器模块的弱电部分性能稳定可靠 . 六路 ( 或三路 ) 触发的一致性也很好 , 但由于为强电触发方式 , 故当主电路中的任一可控硅因故障 ( 门极损坏 ) 而不能被触发时 , 这种情况很容易损坏三相触发器模块上相应的触发端 . 这是此模块的主要不足。

10. 主电路中可控硅的阳极和阴极间必须加一阻容吸收回路保护，其中电阻一般选 15-30Ω、3W 以上，电容选 0.1-0.47uf、400VAC 以上11.SX-JKA, SX-JKT, SX-JKZ, SX-JKB, TB-3A,TB-3Z 本身发热很小 , 不需要安装在散热器上 .。

12. 三相触发器模块和同步变压器模块配套出售。

1.The three phase AC voltage regulation circuit has no phase sequence requirements, but the three phase input cables (R, S, T) in the three phase rectifier circuit has phase sequence requirements. Besides, the input cables and the thyristor (such as R corresponding to the anode of KP1 and the cathode of KP4), the synchronous transformer module and the three phase trigger must be strictly one-to-one correspondence, otherwise the system will not work normally.

2. The trigger terminals of the three phase trigger (such as A1, G1, ..., A6, G6) adopt the strong current trigger mode, which can trigger any SCR thyristor within 1000A current. The connection method of the so-called strong current trigger mode is to connect A1 and G1 (corresponding to the anode and gate of KP1) instead of the usual  cathode and gate.

3. The power grid voltage in the four application circuits (Figures A, B, C, D) must be 380VAC (300~420VAC), 50Hz. If the module is used in the low voltage application (requires full isolation step- down transformer), customers need to contact us for customization.

4.CON must be positive relative to COM, and if the polarity is opposite, the output terminal will be out of control (fully open or fully closed). When the control terminal CON changes from 0V to 5V, the voltage on the AC load can be adjusted from 0V to the maximum value (for resistive loads). When the control voltage on CON is around 0V~0.8V (Fully- closed Region), the control signal can reliably shut down the output of the module. When the control voltage on CON is around 0.8V~4.6V (Adjustable Region), the conduction angle α decreases linearly from 180° to 0° as the control voltage increases, and the voltage on the AC load increases from 0V to the maximum value. When the control voltage on CON is around 4.6V~5V (Full-open Region), the voltage on the AC load is the maximum value (close to the power grid voltage).

5. The input impedance between CON and COM is divided into E, F and H type (the impedance of these three types are greater than or equal to 30KΩ), and G type (the impedance is 250Ω). The +5V voltage signal is only provided for the manual potentiometer (the selected resistance is between 2~10KΩ), not for other uses. Note: The G type (4~20mA as control signal) cannot be manually adjusted by the potentiometer, so the +5V port is useless for the G type.

6.  The power of the three phase load should be balanced. When the load uses the Y-connection method, the center point Y can be connected or not connected to the neutral line. However, the high- order harmonic interference to the power grid when connected to the neutral line is larger than that when not connected to the neutral line. The N line on the synchronous transformer TB-3A must be reliably connected to the earth ground (the neutral line).

7. In the three phase rectifier circuit, when the output terminal of the module is connected in parallel with an electrolytic capacitor to filter, the voltage across the capacitor cannot be abruptly changed, so in this high-voltage and large- capacity case, the thyristor will be damaged due to overcurrent. Therefore, before the module is powered on, it must ensure that the voltage on the control terminal CON is 0V, and after power- on, the voltage on the control terminal CON must be gradually increased from 0V to ensure the minimum surge current of the capacitor.

8. The speed control of the three phase AC asynchronous motor should be adjusted by the frequency converter, while the three phase voltage regulation module can only be applied to fan motors and pump motors where the requirements are not high. For the soft start of the three phase motors, the voltage/current closed-loop control system should be used.

9.  The performance of the weak current part of the three phase trigger module is stable and reliable, and the consistency of the six channels (or three channels) trigger is also very good.However, the three phase trigger module adopts the strong current trigger mode, so if any thyristor in the main circuit malfunctions (the gate is damaged) and cannot be triggered, the corresponding trigger terminal on the three phase trigger module will be easily damaged. This is the main deficiency of this module.This is the main deficiency of the submodule. 

10. In the main circuit, an RC snubber circuit must be added between the anode and the cathode of the thyristor for protection. The resistance of the RC circuit is generally 15~30Ω, 3W or more, and the capacitance is 0.1~0.47μf, 400VAC or more.

11. SX-JKA, SX-JKT, SX-JKZ, SX-JKB, TB- 3A, and TB-3Z generate very little heat and do not need to be mounted on a heat