CN201498436U - Optical coupler based mixing type alternating contactor passive switch driving controller - Google Patents
Optical coupler based mixing type alternating contactor passive switch driving controller Download PDFInfo
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- CN201498436U CN201498436U CN2009203096689U CN200920309668U CN201498436U CN 201498436 U CN201498436 U CN 201498436U CN 2009203096689 U CN2009203096689 U CN 2009203096689U CN 200920309668 U CN200920309668 U CN 200920309668U CN 201498436 U CN201498436 U CN 201498436U
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Abstract
Description
技术领域technical field
本实用新型涉及一种基于光耦的混合式交流接触器无源开关驱动控制器,属交流接触器技术领域。The utility model relates to a passive switch drive controller for a hybrid AC contactor based on an optocoupler, which belongs to the technical field of AC contactors.
背景技术Background technique
混合式交流接触器实现了无弧接通与分断,从而保证交流接触器具有很高的电寿命,大幅度提高运行可靠性与性能指标,张培铭等在《低压电器》2001年第1期发表的论文“新型智能混合式交流接触器”,郑昕等在《低压电器》2005年第9期发表的论文“智能混合式无弧交流接触器的研究”,张培铭等所获专利“智能型混合式交流接触器”(专利号ZL00242121.6)都介绍了采用单片机系统对采用二个或三个晶闸管的混合式交流接触器进行无弧分断的控制,这些是很好的方案,但是由于这些方案实现智能控制,控制系统比较复杂,必须专门配置如变压器或开关电源等独立电源,将接触器的激磁电源与主电路进行电的隔离,并且提供控制电路所需的电源,必须配置电流互感器检测主电路电流,并且单片机系统输出的控制信号按常规接法并接施加于与主触头并联的晶闸管的控制极与阴极上,通过足够大的信号容量使晶闸管处于等待导通状态,并且单片机系统是分别为三相晶闸管提供控制信号.由于混合式交流接触器控制要求较高,造成控制电路复杂且成本高,这些方案很适合于要求较高的应用场合,通过长期进行交流接触器,特别是混合式交流接触器的研究了解到对于量大面广的交流接触器的市场需求,不仅需要高水平、功能强的智能混合式交流接触器,更需要适合于广大用户需要的电寿命等性能指标远高于普通交流接触器,但是电路简单的通用型混合式交流接触器,因此对于大量通用交流接触器的应用场合要求提出混合式交流接触器新的通用型控制方案,要求电路简单,成本低,生产极其容易,体积小,同样能实现无弧接通与分断达到高的性能指标的控制电路。The hybrid AC contactor realizes arc-free connection and breaking, thereby ensuring the AC contactor has a high electrical life, greatly improving the operation reliability and performance indicators, Zhang Peiming and others published in the first issue of "Low Voltage Electrical Appliances" in 2001 The paper "New Intelligent Hybrid AC Contactor", Zheng Xin et al. published the paper "Research on Intelligent Hybrid Arcless AC Contactor" in "Low Voltage Electrical Appliances" No. 9, 2005, Zhang Peiming et al. obtained the patent "Intelligent Hybrid AC contactor" (Patent No. ZL00242121.6) has introduced the use of a single-chip microcomputer system to control the hybrid AC contactor using two or three thyristors without arc breaking. These are good solutions, but due to the realization of these solutions Intelligent control, the control system is relatively complicated, and independent power sources such as transformers or switching power supplies must be specially configured to electrically isolate the excitation power supply of the contactor from the main circuit and provide the power required by the control circuit. A current transformer must be configured to detect the main circuit. The circuit current, and the control signal output by the single-chip microcomputer system is connected in parallel to the control pole and cathode of the thyristor connected in parallel with the main contact, and the thyristor is in a waiting state through a large enough signal capacity, and the single-chip microcomputer system is Provide control signals for the three-phase thyristors respectively. Due to the high control requirements of the hybrid AC contactor, the control circuit is complicated and the cost is high. These solutions are very suitable for applications with high requirements. According to the research of AC contactors, the market demand for AC contactors with a large quantity and a wide range requires not only high-level and powerful intelligent hybrid AC contactors, but also performance indicators such as electrical life that are suitable for the needs of the majority of users. It is higher than ordinary AC contactors, but the circuit is a general-purpose hybrid AC contactor. Therefore, for the application of a large number of general-purpose AC contactors, it is required to propose a new general-purpose control scheme for hybrid AC contactors. The circuit is simple and the cost is low. The production is extremely easy, the volume is small, and the control circuit that can also realize arc-free connection and breaking to achieve high performance indicators.
发明内容Contents of the invention
本实用新型的目的是提供一种基于光耦的混合式交流接触器无源开关驱动控制器。The purpose of the utility model is to provide a hybrid AC contactor passive switch drive controller based on an optocoupler.
本实用新型的目的是这样实现的,一种基于光耦的混合式交流接触器无源开关驱动控制器,包括电阻R1,电容C1,电阻R2,整流桥Z,稳压管W,电容C2,电阻R3,光耦G1,光耦G2,光耦G3,电阻R4,电阻R5,电阻R6,双向晶闸管J1,双向晶闸管J2,双向晶闸管J3,其特征在于:接触器线圈激磁电源Y的一端分别接交流接触器线圈X、电阻R1与电容C1,电阻R1的另一端与电容C1的另一端相接后再接到电阻R2的一端,电阻R2的另一端接到整流桥Z的交流侧,接触器线圈激磁电源Y的另一端与交流接触器线圈X的另一端、整流桥Z的另一交流侧相接,整流桥Z的正端分别与稳压管W的正极、电容C2的正极、电阻R3相接,电阻R3的另一端接到光耦G1原边正极,光耦G1原边负极与光耦G2原边正极相接,光耦G2原边负极与光耦G3原边正极相接,整流桥Z的负端分别与稳压管W的负极、电容C2的负极、光耦G3原边负极相接,光耦G1付边一端分别与双向晶闸管J1的阳极、交流接触器的A相主触头AX1的一端相接,光耦G1付边另一端与电阻R4相接,电阻R4的另一端与双向晶闸管J1的控制极相接,双向晶闸管J1的阴极与A相主触头AX1的另一端相接,A相主触头AX1的二端接到A相主电路AX,光耦G2付边一端分别与双向晶闸管J2的阳极、交流接触器的B相主触头BX1的一端相接,光耦G2付边另一端与电阻R5相接,电阻R5的另一端与双向晶闸管J2的控制极相接,双向晶闸管J2的阴极与B相主触头BX1的另一端相接,B相主触头BX1的二端接到B相主电路BX,光耦G3付边一端分别与双向晶闸管J3的阳极、交流接触器的C相主触头CX1的一端相接,光耦G3付边另一端与电阻R6相接,电阻R6的另一端与双向晶闸管J3的控制极相接,双向晶闸管J3的阴极与C相主触头CX1的另一端相接,C相主触头CX1的二端接到C相主电路CX。The purpose of this utility model is achieved in that a hybrid AC contactor passive switch drive controller based on an optocoupler includes a resistor R1, a capacitor C1, a resistor R2, a rectifier bridge Z, a voltage regulator tube W, and a capacitor C2. Resistor R3, optocoupler G1, optocoupler G2, optocoupler G3, resistor R4, resistor R5, resistor R6, bidirectional thyristor J1, bidirectional thyristor J2, bidirectional thyristor J3, characterized in that: one end of the excitation power supply Y of the contactor coil is respectively connected to AC contactor coil X, resistor R1 and capacitor C1, the other end of resistor R1 is connected to the other end of capacitor C1 and then connected to one end of resistor R2, the other end of resistor R2 is connected to the AC side of rectifier bridge Z, the contactor The other end of the coil excitation power supply Y is connected to the other end of the AC contactor coil X and the other AC side of the rectifier bridge Z, and the positive end of the rectifier bridge Z is respectively connected to the positive pole of the regulator tube W, the positive pole of the capacitor C2, and the resistor R3 The other end of resistor R3 is connected to the positive pole of the primary side of optocoupler G1, the negative pole of the primary side of optocoupler G1 is connected to the positive pole of the primary side of optocoupler G2, the negative pole of the primary side of optocoupler G2 is connected to the positive pole of the primary side of optocoupler G3, and the rectification The negative terminal of the bridge Z is respectively connected to the negative pole of the voltage regulator W, the negative pole of the capacitor C2, and the negative pole of the primary side of the optocoupler G3, and the secondary side of the optocoupler G1 is respectively connected to the anode of the bidirectional thyristor J1 and the main contact of the phase A of the AC contactor. One end of the head AX1 is connected, the other end of the side of the optocoupler G1 is connected to the resistor R4, the other end of the resistor R4 is connected to the control pole of the bidirectional thyristor J1, and the cathode of the bidirectional thyristor J1 is connected to the other end of the A phase main contact AX1 The two ends of the A-phase main contact AX1 are connected to the A-phase main circuit AX, and the side ends of the optocoupler G2 are respectively connected to the anode of the bidirectional thyristor J2 and one end of the B-phase main contact BX1 of the AC contactor. The other end of the side of the coupling G2 is connected to the resistor R5, the other end of the resistor R5 is connected to the control pole of the bidirectional thyristor J2, the cathode of the bidirectional thyristor J2 is connected to the other end of the B-phase main contact BX1, and the B-phase main contact The two ends of BX1 are connected to the B-phase main circuit BX, one end of the auxiliary side of the optocoupler G3 is respectively connected to the anode of the bidirectional thyristor J3, and one end of the C-phase main contact CX1 of the AC contactor, and the other end of the auxiliary side of the optocoupler G3 is connected to the resistor R6 is connected, the other end of resistor R6 is connected to the control pole of bidirectional thyristor J3, the cathode of bidirectional thyristor J3 is connected to the other end of C-phase main contact CX1, and the two ends of C-phase main contact CX1 are connected to C-phase Main circuit CX.
本实用新型充分利用晶闸管的特点,采用电容降压,电容储能,光耦隔离,光耦付边串联于主电路双向晶闸管的控制极电路,控制电路仅依靠光耦实现接触器的激磁电源与三相主电路电的隔离,控制电路统一为三相双向晶闸管提供光耦控制的开关信号,实现了混合式交流接触器基于光耦隔离与开关控制的直接驱动,通过光耦付边的开关作用与双向晶闸管的特点控制三相双向晶闸管,而不是将控制信号按常规接法并接施加于与主触头并联的双向晶闸管的控制极与阴极上,无须通过足够大容量的信号使双向晶闸管处于等待导通状态,而是以光耦付边的开关量信号来保证双向晶闸管处于等待导通状态或关断状态,控制电路所需能量由激磁电源直接提供,无须专门配置如变压器或开关电源等独立电源,无须配置电流互感器检测主电路电流,无须进行被控电路相序的检测,充分利用晶闸管的特点,在满足导通条件时,光耦付边处于导通状态.由主电路经光耦付边直接驱动双向晶闸管,在主触头闭合后电流自动从双向晶闸管转移到主触头上,利用主触头闭合通电后压降远低于双向晶闸管导通电压的特点,自动关断双向晶闸管,充分利用晶闸管的特点完成主电路接通过程,而不是依靠关断控制信号来关断双向晶闸管,在满足关断条件时利用滤波电容放电维持双向晶闸管处于等待导通状态,在主触头打开过程,当双向晶闸管两端电压高于导通电压,双向晶闸管导通.使电流从主触头上自动转移到双向晶闸管,在滤波电容放电电量不满足要求时,光耦付边关断,双向晶闸管自动关断,完成主电路开断过程,不仅实现了无弧接通与分断达到高的性能指标,而且大幅度简化了控制电路,具有电路简单,成本低,生产极其容易,体积小等特点。The utility model makes full use of the characteristics of the thyristor, adopts capacitor step-down, capacitor energy storage, optocoupler isolation, the secondary side of the optocoupler is connected in series with the control pole circuit of the bidirectional thyristor of the main circuit, and the control circuit only relies on the optocoupler to realize the excitation power supply of the contactor. The three-phase main circuit is electrically isolated, and the control circuit provides the three-phase bidirectional thyristor with the switch signal controlled by the optocoupler, which realizes the direct drive of the hybrid AC contactor based on the optocoupler isolation and switch control, and the switching function of the secondary side of the optocoupler The characteristics of the bidirectional thyristor control the three-phase bidirectional thyristor, instead of applying the control signal to the control pole and cathode of the bidirectional thyristor connected in parallel with the main contact in parallel according to the conventional connection method, there is no need to pass a sufficiently large-capacity signal to make the bidirectional thyristor in Wait for the conduction state, but use the switching signal of the optocoupler side to ensure that the bidirectional thyristor is in the wait for conduction state or off state. The energy required for the control circuit is directly provided by the excitation power supply, without special configuration such as a transformer or switching power supply, etc. Independent power supply, no need to configure current transformer to detect the current of the main circuit, no need to detect the phase sequence of the controlled circuit, make full use of the characteristics of the thyristor, when the conduction condition is met, the side of the optocoupler is in the conduction state. The secondary side of the coupling directly drives the bidirectional thyristor. After the main contact is closed, the current is automatically transferred from the bidirectional thyristor to the main contact. Using the characteristics that the voltage drop after the main contact is closed and energized is much lower than the conduction voltage of the bidirectional thyristor, the bidirectional thyristor is automatically turned off. Thyristor, make full use of the characteristics of the thyristor to complete the main circuit turn-on process, instead of relying on the shutdown control signal to turn off the bidirectional thyristor. When the shutdown condition is met, the filter capacitor discharge is used to maintain the bidirectional thyristor in a waiting state. During the opening process, when the voltage at both ends of the bidirectional thyristor is higher than the conduction voltage, the bidirectional thyristor is turned on. The current is automatically transferred from the main contact to the bidirectional thyristor. When the discharge power of the filter capacitor does not meet the requirements, the secondary side of the optocoupler is turned off. The bidirectional thyristor is automatically turned off to complete the main circuit breaking process, which not only achieves high performance indicators for arc-free connection and breaking, but also greatly simplifies the control circuit. It has the advantages of simple circuit, low cost, extremely easy production, small size, etc. features.
附图说明Description of drawings
图1为本实用新型实施例一的示意框图。Fig. 1 is a schematic block diagram of Embodiment 1 of the present utility model.
图2为本实用新型实施例一控制的主电路工作过程电流转移的实测波形。Fig. 2 is the measured waveform of the current transfer in the working process of the main circuit controlled by the first embodiment of the utility model.
具体实施方式Detailed ways
下面结合附图及实施例对本发明做进一步描述。The present invention will be further described below in conjunction with the accompanying drawings and embodiments.
如图1所示,一种基于光耦的混合式交流接触器无源开关驱动控制器,包括电阻R1,电容C1,电阻R2,整流桥Z,稳压管W,电容C2,电阻R3,光耦G1,光耦G2,光耦G3,电阻R4,电阻R5,电阻R6,双向晶闸管J1,双向晶闸管J2,双向晶闸管J3,其特征在于:接触器线圈激磁电源Y的一端分别接交流接触器线圈X、电阻R1与电容C1,电阻R1的另一端与电容C1的另一端相接后再接到电阻R2的一端,电阻R2的另一端接到整流桥Z的交流侧,接触器线圈激磁电源Y的另一端与交流接触器线圈X的另一端、整流桥Z的另一交流侧相接,整流桥Z的正端分别与稳压管W的正极、电容C2的正极、电阻R3相接,电阻R3的另一端接到光耦G1原边正极,光耦G1原边负极与光耦G2原边正极相接,光耦G2原边负极与光耦G3原边正极相接,整流桥Z的负端分别与稳压管W的负极、电容C2的负极、光耦G3原边负极相接,光耦G1付边一端分别与双向晶闸管J1的阳极、交流接触器的A相主触头AX1的一端相接,光耦G1付边另一端与电阻R4相接,电阻R4的另一端与双向晶闸管J1的控制极相接,双向晶闸管J1的阴极与A相主触头AX1的另一端相接,A相主触头AX1的二端接到A相主电路AX,光耦G2付边一端分别与双向晶闸管J2的阳极、交流接触器的B相主触头BX1的一端相接,光耦G2付边另一端与电阻R5相接,电阻R5的另一端与双向晶闸管J2的控制极相接,双向晶闸管J2的阴极与B相主触头BX1的另一端相接,B相主触头BX1的二端接到B相主电路BX,光耦G3付边一端分别与双向晶闸管J3的阳极、交流接触器的C相主触头CX1的一端相接,光耦G3付边另一端与电阻R6相接,电阻R6的另一端与双向晶闸管J3的控制极相接,双向晶闸管J3的阴极与C相主触头CX1的另一端相接,C相主触头CX1的二端接到C相主电路CX。As shown in Figure 1, an optocoupler-based hybrid AC contactor passive switch drive controller includes resistor R1, capacitor C1, resistor R2, rectifier bridge Z, voltage regulator tube W, capacitor C2, resistor R3, optical Coupler G1, optocoupler G2, optocoupler G3, resistor R4, resistor R5, resistor R6, bidirectional thyristor J1, bidirectional thyristor J2, bidirectional thyristor J3, characterized in that: one end of the contactor coil excitation power supply Y is respectively connected to the AC contactor coil X. Resistor R1 and capacitor C1. The other end of resistor R1 is connected to the other end of capacitor C1 and then connected to one end of resistor R2. The other end of resistor R2 is connected to the AC side of rectifier bridge Z. The contactor coil excitation power supply Y The other end of the AC contactor coil X is connected to the other end of the rectifier bridge Z, and the positive end of the rectifier bridge Z is respectively connected to the positive pole of the voltage regulator tube W, the positive pole of the capacitor C2, and the resistor R3. The other end of R3 is connected to the positive pole of the primary side of optocoupler G1, the negative pole of the primary side of optocoupler G1 is connected to the positive pole of the primary side of optocoupler G2, the negative pole of the primary side of optocoupler G2 is connected to the positive pole of the primary side of optocoupler G3, and the negative pole of the rectifier bridge Z The terminals are respectively connected to the negative pole of the voltage regulator W, the negative pole of the capacitor C2, and the negative pole of the primary side of the optocoupler G3. The other end of the side of the optocoupler G1 is connected to the resistor R4, the other end of the resistor R4 is connected to the control pole of the bidirectional thyristor J1, the cathode of the bidirectional thyristor J1 is connected to the other end of the A-phase main contact AX1, A The two ends of the phase main contact AX1 are connected to the A phase main circuit AX, and one end of the auxiliary side of the optocoupler G2 is respectively connected to the anode of the bidirectional thyristor J2, and one end of the main contact BX1 of the B phase of the AC contactor, and the auxiliary side of the optocoupler G2 The other end is connected to the resistor R5, the other end of the resistor R5 is connected to the control pole of the bidirectional thyristor J2, the cathode of the bidirectional thyristor J2 is connected to the other end of the B-phase main contact BX1, and the two ends of the B-phase main contact BX1 Connected to the B-phase main circuit BX, one side of the optocoupler G3 is connected to the anode of the bidirectional thyristor J3 and one end of the C-phase main contact CX1 of the AC contactor, and the other side of the optocoupler G3 is connected to the resistor R6. The other end of the resistor R6 is connected to the control pole of the bidirectional thyristor J3, the cathode of the bidirectional thyristor J3 is connected to the other end of the C-phase main contact CX1, and the two ends of the C-phase main contact CX1 are connected to the C-phase main circuit CX.
当接触器线圈激磁电源Y上电时,交流接触器线圈X通电,同时激磁电源经电阻R1、电容C1与电阻R2降压并限流后再经过整流桥Z将激磁电源变为低压直流电压,该电压由稳压管W稳压,电容C2滤波后再经电阻R3限流施加于三个光耦的原边,三个光耦起着隔离与控制信号传输的作用,光耦G1原边、光耦G2原边与光耦G3原边串联,三个光耦原边导通,光耦G1付边处于导通状态,由于A相主触头AX1处于断开状态,A相主电路AX电压施加于光耦G1付边、限流电阻R4、双向晶闸管J1的控制极与阴极的电路,使双向晶闸管J1导通,A相主电路AX接通,由于接触器线圈通电后滞后一段时间,主触头才闭合,在A相主电路AX经双向晶闸管J1接通后,A相主触头AX1闭合,电流从双向晶闸管J1转移到A相主触头AX1上,A相主触头AX1闭合通电后电压降很低,不足以维持双向晶闸管J1运行,双向晶闸管J1关断,完成A相主电路AX的接通过程,B相主电路BX与C相主电路CX的接通过程与A相相同。When the contactor coil excitation power Y is powered on, the AC contactor coil X is energized, and at the same time the excitation power is stepped down by the resistor R1, capacitor C1 and resistor R2 to limit the current, and then through the rectifier bridge Z to change the excitation power into a low-voltage DC voltage. The voltage is stabilized by the voltage regulator tube W, filtered by the capacitor C2 and then applied to the primary sides of the three optocouplers through the current limiting of the resistor R3. The three optocouplers play the role of isolation and control signal transmission. The primary side of the optocoupler G1, The primary side of the optocoupler G2 is connected in series with the primary side of the optocoupler G3, the primary sides of the three optocouplers are turned on, and the secondary side of the optocoupler G1 is in the conduction state. Since the main contact AX1 of the phase A is in the disconnected state, the voltage of the main circuit AX of the phase A Applied to the secondary side of the optocoupler G1, the current limiting resistor R4, the control pole and the cathode circuit of the bidirectional thyristor J1, the bidirectional thyristor J1 is turned on, and the A-phase main circuit AX is turned on. Because the contactor coil is energized and lags behind for a period of time, the main After the contact is closed, after the main circuit AX of phase A is connected through the bidirectional thyristor J1, the main contact AX1 of phase A is closed, the current is transferred from the bidirectional thyristor J1 to the main contact AX1 of phase A, and the main contact AX1 of phase A is closed and energized The final voltage drop is very low, which is not enough to maintain the operation of the bidirectional thyristor J1, and the bidirectional thyristor J1 is turned off to complete the connection process of the A-phase main circuit AX, and the connection process of the B-phase main circuit BX and the C-phase main circuit CX is the same as that of the A phase .
接触器开断电路过程是当接触器线圈激磁电源Y断电时,交流接触器线圈X断电,同时电容C2经电阻R3向三个光耦的原边放电,三个光耦起着隔离与控制信号传输的作用,光耦G1原边、光耦G2原边与光耦G3原边串联,三个光耦原边关断,光耦G1付边处于关断状态,由于此时A相主触头AX1处于闭合状态,而A相主触头AX1闭合通电后电压降很低,不足以维持双向晶闸管J1运行,双向晶闸管J1仍处于关断状态,当A相主触头AX1打开后,双向晶闸管J1满足导通条件,电流从A相主触头AX1转移到双向晶闸管J1上,当电容C2经电阻R3向三个光耦的原边放电,不满足光耦导通条件后,光耦G1付边关断,双向晶闸管J1在小于维持电流时关断,从而完成A相主电路(AX)的开断过程,B相主电路BX与C相主电路CX的开断过程与A相相同。The contactor breaking circuit process is that when the contactor coil excitation power supply Y is powered off, the AC contactor coil X is powered off, and at the same time, the capacitor C2 discharges to the primary side of the three optocouplers through the resistor R3, and the three optocouplers play an isolation role. With the function of control signal transmission, the primary side of optocoupler G1, the primary side of optocoupler G2 and the primary side of optocoupler G3 are connected in series, the primary sides of the three optocouplers are turned off, and the auxiliary side of optocoupler G1 is in the off state. The main contact AX1 is in the closed state, and the voltage drop after the main contact AX1 of phase A is closed and energized is very low, which is not enough to maintain the operation of the bidirectional thyristor J1, and the bidirectional thyristor J1 is still in the off state. When the main contact AX1 of the phase A is opened, The bidirectional thyristor J1 meets the conduction condition, and the current is transferred from the main contact AX1 of phase A to the bidirectional thyristor J1. When the capacitor C2 discharges to the primary side of the three optocouplers through the resistor R3, and the optocoupler conduction condition is not satisfied, the optocoupler The secondary side of G1 is turned off, and the bidirectional thyristor J1 is turned off when it is less than the holding current, thus completing the breaking process of the A-phase main circuit (AX), and the breaking process of the B-phase main circuit BX and the C-phase main circuit CX is the same as that of the A-phase .
由于充分利用晶闸管的特点,采用电容降压,电容储能,光耦隔离,光耦付边串联于主电路双向晶闸管的控制极电路,控制电路仅依靠光耦实现接触器的激磁电源与三相主电路电的隔离,控制电路统一为三相双向晶闸管提供光耦控制的开关信号,实现了混合式交流接触器基于光耦隔离与开关控制的直接驱动,通过光耦付边的开关作用与双向晶闸管的特点控制三相双向晶闸管,而不是将控制信号按常规接法并接施加于与主触头并联的双向晶闸管的控制极与阴极上,无须通过足够大容量的信号使双向晶闸管处于等待导通状态,而是以光耦付边的开关量信号来保证双向晶闸管处于等待导通状态或关断状态,控制电路所需能量由激磁电源直接提供,无须专门配置如变压器或开关电源等独立电源,无须配置电流互感器检测主电路电流,无须进行被控电路相序的检测,充分利用晶闸管的特点,在满足导通条件时,光耦付边处于导通状态.由主电路经光耦付边直接驱动双向晶闸管,在主触头闭合后电流自动从双向晶闸管转移到主触头上,利用主触头闭合通电后压降远低于双向晶闸管导通电压的特点,自动关断双向晶闸管,充分利用晶闸管的特点完成主电路接通过程,而不是依靠关断控制信号来关断双向晶闸管,在满足关断条件时利用滤波电容放电维持双向晶闸管处于等待导通状态,在主触头打开过程,当双向晶闸管两端电压高于导通电压,双向晶闸管导通.使电流从主触头上自动转移到双向晶闸管,在滤波电容放电电量不满足要求时,光耦付边关断,双向晶闸管自动关断,完成主电路开断过程,不仅实现了无弧接通与分断达到高的性能指标,而且大幅度简化了控制电路,具有电路简单,成本低,生产极其容易,体积小等特点。Due to the full use of the characteristics of the thyristor, the use of capacitor step-down, capacitor energy storage, optocoupler isolation, the secondary side of the optocoupler is connected in series with the control pole circuit of the bidirectional thyristor in the main circuit, and the control circuit only relies on the optocoupler to realize the excitation power supply of the contactor and the three-phase The main circuit is electrically isolated, and the control circuit uniformly provides the switching signal controlled by the optocoupler for the three-phase bidirectional thyristor, which realizes the direct drive of the hybrid AC contactor based on optocoupler isolation and switch control. The characteristics of the thyristor control the three-phase bidirectional thyristor, instead of applying the control signal to the control pole and cathode of the bidirectional thyristor connected in parallel with the main contact in parallel according to the conventional connection method, there is no need to pass a sufficiently large-capacity signal to make the bidirectional thyristor in the waiting state. Instead, the switching signal on the secondary side of the optocoupler is used to ensure that the bidirectional thyristor is in the waiting state or off state. The energy required for the control circuit is directly provided by the excitation power supply, and there is no need for special configurations such as transformers or switching power supplies. , no need to configure the current transformer to detect the current of the main circuit, no need to detect the phase sequence of the controlled circuit, make full use of the characteristics of the thyristor, when the conduction condition is met, the optocoupler side is in the conduction state. The side directly drives the bidirectional thyristor, and the current is automatically transferred from the bidirectional thyristor to the main contact after the main contact is closed. Using the characteristic that the voltage drop after the main contact is closed and powered is much lower than the conduction voltage of the bidirectional thyristor, the bidirectional thyristor is automatically turned off. Make full use of the characteristics of the thyristor to complete the main circuit turn-on process, instead of relying on the turn-off control signal to turn off the triac, when the turn-off condition is met, the filter capacitor is used to discharge the triac to maintain the state of waiting for conduction, and the main contact is opened. , when the voltage at both ends of the bidirectional thyristor is higher than the conduction voltage, the bidirectional thyristor is turned on, so that the current is automatically transferred from the main contact to the bidirectional thyristor. Automatic shutdown, complete the breaking process of the main circuit, not only achieves high performance indicators for arc-free making and breaking, but also greatly simplifies the control circuit, has the characteristics of simple circuit, low cost, extremely easy production, and small size.
图2为基于光耦的混合式交流接触器无源开关驱动控制器经实验室完整的电路测试,实现了全过程无弧接通与分断的波形图,波形图显示混合式交流接触器某相电路工作全过程,图中上面波形为某相双向晶闸管的电流波形,下面波形为某相主触头的电流波形,当接触器线圈激磁电源上电时,交流接触器线圈通电,由于某相主触头处于断开状态,该相双向晶闸管导通,该相主电路接通,由于接触器线圈通电后滞后一段时间,该相主触头才闭合,该相主触头闭合后,电流从双向晶闸管转移到该相主触头上,该相主触头闭合通电后电压降很低,不足以维持双向晶闸管运行,双向晶闸管关断,该相主电路电流通过主触头进入运行状态,完成该相主电路的接通过程,从图中可见在接通过程主触头发生弹跳,主电路电流在主触头与双向晶闸管之间转移,双向晶闸管仍然保证主电路的电流处于导通状态,接触器开断电路过程是当接触器线圈激磁电源断电时,交流接触器线圈断电,由于某相主触头闭合通电后电压降很低,不足以维持双向晶闸管运行,双向晶闸管仍处于关断状态,主电路电流仍然通过主触头,当该相主触头打开后,双向晶闸管满足导通条件,电流从该相主触头转移到双向晶闸管上,当电容经电阻向三个光耦的原边放电,不满足光耦导通条件后,光耦付边关断,双向晶闸管在小于维持电流时关断,该相主电路电流关断,从而完成该相主电路的开断过程。Figure 2 is the wave form diagram of the hybrid AC contactor passive switch drive controller based on optocoupler after the complete circuit test in the laboratory, which realizes the arc-free connection and breaking in the whole process. The waveform diagram shows a phase of the hybrid AC contactor In the whole process of circuit operation, the upper waveform in the figure is the current waveform of a bidirectional thyristor of a certain phase, and the lower waveform is the current waveform of the main contact of a certain phase. When the excitation power supply of the contactor coil is powered on, the AC contactor coil is energized. The contact is in the disconnected state, the bidirectional thyristor of this phase is turned on, and the main circuit of this phase is connected. Because the contactor coil is energized after a period of time lag, the main contact of this phase is closed. After the main contact of this phase is closed, the current flows from the bidirectional The thyristor is transferred to the main contact of this phase. After the main contact of this phase is closed and energized, the voltage drop is very low, which is not enough to maintain the operation of the bidirectional thyristor, and the bidirectional thyristor is turned off. During the connection process of the phase main circuit, it can be seen from the figure that the main contact bounces during the connection process, and the current of the main circuit is transferred between the main contact and the bidirectional thyristor. The bidirectional thyristor still ensures that the current of the main circuit is in the conduction state. The circuit breaker process is that when the contactor coil excitation power supply is cut off, the AC contactor coil is powered off. Since the main contact of a certain phase is closed and the voltage drop is very low, it is not enough to maintain the operation of the bidirectional thyristor, and the bidirectional thyristor is still off. In the off state, the current of the main circuit still passes through the main contacts. When the main contacts of this phase are opened, the bidirectional thyristor meets the conduction condition, and the current is transferred from the main contacts of this phase to the triac. When the primary side of the optocoupler is discharged and the conduction condition of the optocoupler is not met, the optocoupler secondary side is turned off, the bidirectional thyristor is turned off when it is less than the maintenance current, and the current of the main circuit of this phase is turned off, thereby completing the breaking process of the main circuit of this phase.
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CN111696802A (en) * | 2019-09-30 | 2020-09-22 | 刘卫歧 | Intelligent chip set module of non-arc switch |
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CN111696802A (en) * | 2019-09-30 | 2020-09-22 | 刘卫歧 | Intelligent chip set module of non-arc switch |
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