KCZB type high performance general three-phase control board

I. Introduction

  KCZB type high-performance general-purpose thyristor three-phase control board is designed for thyristor DC speed regulation, three-phase AC voltage regulation, high-power three-phase full-controlled or half-controlled rectifier power supply, DC motor, AC synchronous power generation The main design features of the high-performance multi-function control board developed for applications such as machine excitation are as follows:
    1. The TC787 special integrated circuit produced by our company is used to complete the phase shift trigger function of the three-phase full-control or half-control bridge thyristor, because one TC787 can replace three KJ009 (or KJ004 or TCA785) and a combination of KJ041 and KJ042. Therefore, the size of the three-phase six-way phase-shifting trigger pulse forming link is greatly reduced, the integration level is improved, the peripheral components are reduced, the reliability is enhanced, and the debugging steps are simplified;
    2. The entire printed circuit board all uses high-performance imported integrated circuits, and only five integrated circuits are used, with high integration and strong reliability;
    3. Imported plates for printed boards, using new hot-air trimming and printed board processing technology, good anti-corrosion performance, and reliable routing of holes;
    4. The pulse power amplifier, shaping and anti-interference parts are all arranged on one board, which avoids the inconvenience of wiring and installation between the main board and the final board with a pulse final board, making it more convenient for users to use;
    5. The printed board is designed with over-voltage, over-current, under-current and other protections, and the protection threshold is adjustable. It can form closed loops such as voltage stabilization, current stabilization, generator output voltage stabilization, and speed stabilization according to different user strobe signals. It can realize the corresponding closed-loop stability function, which greatly meets the different needs of different users;
    6. The high-performance thyristor produced by our company is used to protect the three-phase phase loss and phase error protection thick film integrated circuit, which can realize the protection function under phase loss and phase error to ensure the safety of the user system;
    7. The board is designed with a given integral link, a closed-loop regulator and a contact signal after protection, which can not only ensure that the user's step setting is turned into a slope setting and the closed-loop adjustment function, but also that the pulse is sealed at the same time after the protection. Provide a normally open (overvoltage, overcurrent, current cut-off, undercurrent protection) and a normally closed (phase loss or phase error protection) contact signal (contact capacity 1A/220V or 0.5A/380V) for users to use It is used to break its own main circuit to ensure safety in the event of a system failure.
    8. There are three kinds of setting modes: local setting, computer setting and central console (remote control), and the three setting methods can be selected.

    2. Application notes and usage

  KCZB type general control board printed board outline size and main components layout diagram is shown in Figure 1. Its usage is as follows:

                         Figure 1
    1. The function of the socket S3 pin:
    Ug is the given input terminal of the user¨s local machine, the 305# and 306# pins are respectively the control bit outside the machine or the control signal input terminal of the centralized console, and Pins 300# and 310# are the strobe signal input terminals for the 4052 channel, and between JZ and 300# is an auxiliary normally open contact input terminal of the user system. The definite integrator starts to give integral from zero only after the main contactor of the system is closed, so as to avoid the impact caused by the starting of the main circuit after the given integral reaches the maximum value. Then 307# and 308# are normally open buttons for resetting after protection. Connect the end.
    2. External connection of socket S5:
    +15V and -15V are respectively two output signal connection terminals, which are used to provide positive and negative power to the user system, and the maximum output load capacity is 100mA, and The 300# pin is the reference ground terminal of the power supply of the control board, and the 303# and 304# pins are the connection terminals of the current feedback signal and the voltage feedback signal respectively. The two terminals allow the application of 0-10V DC voltage.
    3. External wiring of socket S6:
    The a, b, and c terminals are connected to the secondary side of a star-connected three-phase synchronous transformer, and the neutral point is connected to the 300# terminal. The allowable phase voltage is 18゛ 30V, U1, V1, and W1 are the feedback signal connection terminals of the output voltage of the three-phase synchronous generator respectively, allowing the applied phase voltage to be 0-9V AC; a2, b2, and c2 are the three-phase AC voltages that provide the positive power supply for the control board. The terminals a1, b1, and c1 are the three-phase AC voltage signal connection terminals that provide the negative power supply for the operation of the control board; the terminals a1, b1, c1, a2, b2, and c2 allow the applied AC phase voltage to be 0-9V.
    4. External wiring of socket S2:
    201# terminal is connected to AC 220V or 380V, between it and 227# is a normally closed contact, and between 225#, 224#, and 223# terminals respectively It is a normally open contact with contact capacity of 380V/0.5A and 220V/1A respectively. These contacts can be used to control the main circuit of the system.
    5. External connection of socket S1:
    G1, K1; G2, K2; G3, K3; G4, K4; G5, K5; G6, K6 on socket S1 are used to connect to three-phase AC For the gate cathodes of the six thyristors in the voltage system, if the system is a three-phase half-controlled bridge or a three-phase half-wave, when three of the thyristors are connected with a common cathode, only G1, K1; G3, K3; G5, K5 are used ; And when the three thyristors are connected with a common anode, only G2, K2; G4, K4 and G6, K6 three groups of output are used.
    6. The function and adjustment method of each potentiometer
    (1) P1 is the overvoltage protection action threshold adjustment potentiometer, the counterclockwise adjustment protection action threshold increases, and the clockwise adjustment protection action threshold decreases.
    (2) P10 is the over-current protection action threshold adjustment potentiometer, the counterclockwise adjustment protection action threshold decreases, and the clockwise adjustment protection action threshold increases.
    (3) P13 is the threshold adjustment potentiometer for the protection against under-excitation misoperation. The threshold for counterclockwise adjustment is reduced, and the threshold for clockwise adjustment is increased.
    (4) P11 is the under-excitation protection action threshold adjustment potentiometer, the counterclockwise adjustment protection action threshold increases, and the clockwise adjustment protection action threshold increases.
    (5) P3 is the closed-loop regulator magnification and proportional integral time constant adjustment potentiometer.
    (6) P19 is the current cut-off protection action threshold adjustment potentiometer. Clockwise adjustment of the protection function delete threshold decreases, and the counterclockwise adjustment protection function delete threshold increases.
    (7) P12 is the under-excitation protection function delete threshold adjustment potentiometer, the clockwise adjustment protection function delete threshold decreases, and the counterclockwise adjustment protection function delete threshold increases. .
    (8) P8 is a given integral rise time adjustment potentiometer, counterclockwise to adjust the given integral rise time to increase, and clockwise to adjust the given integral rise time to shorten.
    (9) P5 is a given integral fall time adjustment potentiometer, counterclockwise to adjust the given integral fall time to increase, and clockwise to adjust the given integral fall time to shorten.
    (10) P9 is the maximum thyristor phase shift angle max limiting adjustment potentiometer, clockwise adjustment maximum max increases, counterclockwise adjustment maximum max decreases.
    (11) P7 is a potentiometer for adjusting the output voltage of the differentiator when it is set to zero, clockwise adjusting the output voltage of the differentiator to increase, and counterclockwise adjusting the output voltage of the differentiator to decrease .
    (12) P16゛P18 are three-phase synchronous voltage adjustment balance potentiometers, adjust the synchronous voltage added to the TC787 pin counterclockwise to increase, and adjust clockwise to add to TC787 The equivalent synchronization voltage of the pin is reduced.
    7. All the connecting plug-ins of the KCZB board are vertically plugged in and out of the board, and the wires between the sockets should not be connected wrongly.
    8. The maximum size of the KCZB board is length〜width〜height=225mm〜190mm〜30mm. It is placed and installed on a plane in the user system, so no plug-in box is required.
    9. The six pulses output by the board can trigger any thyristor with a current capacity of 5゛1650A.

    Three, application examples

The excellent performance of   KCZB board makes it convenient to use in three-phase AC speed regulation, three-phase AC voltage regulation power device, DC speed regulation, thyristor excitation power supply, electrolysis, electroplating power supply and other combinations.
1. KCZB board is used for three-phase AC voltage regulating system.
   The schematic diagram of the KCZB board used in the AC voltage regulation system is shown in Figure 2. The system is a system with overcurrent protection and constant current regulation functions.
Figure 2   KCZB board is used for three-phase AC voltage regulation system
2. The KCZB board is used in the DC speed regulation system as shown in Figure 3. This system is a speed closed-loop DC regulation system.

                    Figure 3