◎ 三相半控整流移相觸發(fā)器模塊 (SX-JKB)
THREE PHASE HALF-CONTROLLED RECTIFICATION PHASE-SHIFT TRIGGER MODULE (SX-JKB)
◆ SX-JKB 在三相整流同步變壓器模塊 TB-3Z 的支持下, 即可實(shí)現(xiàn)三相半控整流電路輸出直流電壓的無級可調(diào)。
◆ 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.
◎ 有關(guān)技術(shù)指標(biāo)及應(yīng)注意的問題
Related technical specifications and precautions
1. 三相交流調(diào)壓電路無相序要求 , 但三相整流電路中三相進(jìn)線 (R, S, T) 有相序要求 , 且進(jìn)線和可控硅 ( 如 R 對應(yīng) KP1 的陽極和 KP4 的陰極 ), 同步變壓器模塊及三相觸發(fā)器之間必須嚴(yán)格一一對應(yīng), 否則系統(tǒng)不能正常工作。
2. 三相觸發(fā)器的觸發(fā)端 ( 如 A1, G1, … …, A6, G6) 為強(qiáng)電觸發(fā)方式, 可以觸發(fā)1000A以內(nèi)的任何單向可控硅.這里所謂的強(qiáng)電觸發(fā)方式的連線為 A1, G1 對應(yīng) KP1 的陽極和門極 , 而不是通常的陰極和門極。
3. 四個(gè)應(yīng)用電路中的電網(wǎng)線電壓為 380VAC, 50Hz, 允許在 300~420VAC 范圍內(nèi)使用 . 如用戶使用在低電壓上 ( 需帶全隔離降壓變壓器 ), 則需向我公司定制。
4.CON 對 COM 必須為正 , 如極性相反則輸出端失控( 全開或全閉 ). 當(dāng)控制端 CON 從 0~5V 改變時(shí) , 交流負(fù)載上的電壓從0V到最大值可調(diào)(對阻性負(fù)載而言).其中 CON 在 0~0.8V 左右時(shí)為全關(guān)閉區(qū)域 , 能可靠關(guān)斷模塊的輸出 ; CON 在 0.8V~4.6V 左右為可調(diào)區(qū)域 , 即隨著控制電壓的增大 , 導(dǎo)通角 α 從 180°到 0°線性減小 , 交流負(fù)載上的電壓從 0V 增大到最大值 ; CON 在4.6V~5V 左右時(shí)為全開通區(qū)域 , 交流負(fù)載上的電壓為最大值 ( 接近電網(wǎng)電壓 )。
5.CON 對 COM 的輸入阻抗分 E, F 和 H 型均為大于等于 30KΩ; G 型為 250Ω. +5V 電壓信號只提供給手控電位器用 , 不做他用 , 所選用的電位器阻值在 2~10KΩ間 , 注 : 4~20mA 的 G 型不能用電位器手動調(diào)節(jié) , 此時(shí)+5V 端也沒有用處。
6. 三相交流調(diào)壓電路中三相功率應(yīng)均衡。負(fù)載為 Y 形接法時(shí)，Y 的中心點(diǎn)可接、可不接中心線，但接中心線時(shí)高次諧波對電網(wǎng)干擾要比不接時(shí)大。同步變壓器模塊為TB-3A 上的 N 必須接地（中心線）。
7. 三相整流電路中 , 當(dāng)輸出端并聯(lián)電解電容濾波時(shí) , 由于電容兩端電壓不能突變 , 這種高電壓 , 大容性場合很容易造成可控硅過流而損壞 , 因此模塊上電前須保證控制端CON電壓在 0V, 上電后 , CON須從 0V 逐漸增大 ,以保證電容沖擊電流最小。
8. 三相交流異步電機(jī)的調(diào)速應(yīng)采用變頻器 , 只有風(fēng)機(jī)類 ,水泵類電機(jī)在要求不高的場合可采用三相調(diào)壓模塊 . 三相電機(jī)軟啟動應(yīng)采用電壓 , 電流閉環(huán)控制 。
9. 三相觸發(fā)器模塊的弱電部分性能穩(wěn)定可靠 . 六路 ( 或三路 ) 觸發(fā)的一致性也很好 , 但由于為強(qiáng)電觸發(fā)方式 , 故當(dāng)主電路中的任一可控硅因故障 ( 門極損壞 ) 而不能被觸發(fā)時(shí) , 這種情況很容易損壞三相觸發(fā)器模塊上相應(yīng)的觸發(fā)端 . 這是此模塊的主要不足。
10. 主電路中可控硅的陽極和陰極間必須加一阻容吸收回路保護(hù)，其中電阻一般選 15-30Ω、3W 以上，電容選 0.1-0.47uf、400VAC 以上11.SX-JKA, SX-JKT, SX-JKZ, SX-JKB, TB-3A,TB-3Z 本身發(fā)熱很小 , 不需要安裝在散熱器上 .。
12. 三相觸發(fā)器模塊和同步變壓器模塊配套出售。
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
