KCZ6.3 type thyristor three-phase full control (half control) bridge control board

I. Introduction

   KCZ6.3 type thyristor three-phase full control (semi-control) bridge control board is based on the KCZ6.0 type three-phase full control (semi-control) bridge control board with additional protection functions and Therefore, in addition to all the functions of the KCZ6.0 board, it also has an overvoltage (or overcurrent) protection function. The protection threshold is adjustable. After the protection, while blocking its own output pulse, it also provides users with a Contact signal (contact capacity 220V/1A or 380V/0.5A), so that users can use it to break the main circuit of their own system in the event of a fault, and realize perfect protection functions. The overall size of the printed board is length〜width 〜H=152mm〜97mm〜40mm, adopting four-hole plane installation, installation hole distance length〜width=142mm〜87mm.

II. Conditions of use

    1. Altitude: +1500m;

    2. Ambient temperature: -10≧ ゛+45≧;

    3. The maximum relative humidity of the air: +90% (when the relative environmental humidity is 20≧);

    4. There is no conductive and explosive dust around, no gas that corrodes metals and damages insulation;

5. No severe vibration and shock.

Three. How to use KCZ6.3 three-phase full control (semi-control) bridge control board

    1. The external dimensions of the KCZ6.3 board are: length〜width〜height=152mm〜87mm〜28mm, which adopts four-hole plane installation, and the actual external leads are as shown in the figure As shown in 1, there are a total of four connectors for its connection with the user system, and the connection method of each plugin with the user system is:

    1.1 External connection of socket S2

    (1) 18V, GND and 18V in S2 are respectively connected to the two winding ends and the middle tap of the secondary side of the transformer of the power supply with a double AC 18V winding with a middle tap end.

    (2) a, GND; b, GND; c, GND are respectively connected to three windings with a phase voltage of 30V on the secondary side of the three-phase synchronous transformer, in KCZ6.3 When the board is used for control in a three-phase controllable rectifier system without a transformer in the main circuit, it is recommended that the three-phase synchronous transformer be connected to Δ/Y-11, and when the KCZ6.3 board is used in a three-phase system without a transformer in the main circuit When doing three-phase AC voltage regulation control, it is recommended that the synchronous transformer be connected to Y/Y-12; when the main circuit has a transformer, the three-phase synchronous voltage of the KCZ6.3 board should come from its connection and the connection of the main circuit transformer The secondary side of the synchronous transformer.

    (3) +15V, GND in the S2 socket; the UK three ends are connected to an external given potentiometer, the resistance value of the potentiometer is 4.7K, and one end passes through a The 2K resistor is connected to +15V, the other end is connected to GND, and the middle tap is connected to UK.

    (4) The S in the S2 socket is an output signal when the KCZ6.3 board is used for in-board protection, and its high level is effectively connected to the user system for failure The protection is synchronized with the user system. When the KCZ6.3 board is used for external protection, it is an input signal, high level (greater than 10V) is valid, and its output and input load capacity is 2mA.

    1.2 Outer line of socket S4

    Uf and If of S4 are respectively connected to the voltage and current sampling signals of the controlled system. These two ports are used for over-voltage or over-current protection and allow input of voltage signals The value is AC or DC 0゛10V, and its load current capacity is 20mA.

    1.3 External wiring of socket S1

+24V, g1 in socket S1; +24V, g2; +24V, g3; +24V, g4; +24V, g5; +24V, g6 respectively correspond to the six in the main circuit The pulse final board of the thyristor or the primary input terminal of the pulse transformer.

 

                        Figure 1

     1.4 External wiring of socket S3

     There is a normally open contact between the two terminals A and B of socket S3, and its contact capacity is 220V/1A or 380V/0.5A for fault protection Disconnect the main circuit of the user system.

    2. The function and adjustment method of each potentiometer in KCZ6.3 board

    There are 9 potentiometers in the KCZ6.3 board. The layout diagram of each potentiometer in the board is shown in Figure 1. Their respective functions and adjustment methods are as follows:

    2.1 W1, W2, W3 three-phase synchronization signal balance adjustment potentiometer, the three potentiometers are used to adjust the addition to TC787 18#, 1#, 2# three-pin input three-phase synchronization signal amplitude level, to achieve the same three-phase synchronization signal amplitude, and at the same time the adjustment of the three potentiometers, adjustable T for the synchronization signal filtering The time constant of the type network realizes the synchronization of the three-phase phase of the output pulse and the voltage phase of the anode and cathode of the controlled thyristor of the main circuit. TC787 when adjusting clockwise The equivalent synchronous voltage amplitude of 18#, 1#, 2# pins decreases, and the time constant of the T-type filter network increases; counterclockwise adjustment of the synchronous voltage amplitude added to TC787 18#, 1#, 2# pins increases, That is, the time constant of the T-type filter network decreases.

    2.2 W4 is the maximum alpha angle limiter adjustment potentiometer, clockwise adjusts the maximum alpha angle limiter value to decrease, and counterclockwise adjusts the maximum alpha angle limiter value to increase.

    2.3 W6 is the overvoltage protection sampling signal amplitude adjustment potentiometer, the potentiometer is used to match the voltage sampling signal with the overvoltage protection threshold value, counterclockwise adjustment is equivalent The sampling signal value increases, and the equivalent sampling value decreases by adjusting clockwise.

    2.4 W9 is an overvoltage protection threshold adjustment potentiometer. Adjust the protection threshold clockwise to increase and counterclockwise to decrease the protection threshold.

    2.5 W5 is an internal given signal adjustment potentiometer, used as a given signal when adjusting the board or internal control, after the control board is adjusted or the user's external setting has no effect , The midpoint line should be disconnected at this time.

    2.6 W7 overcurrent protection sampling signal amplitude adjustment potentiometer, this potentiometer is used to match the current sampling signal with the overcurrent protection threshold value, and adjust the equivalent sampling counterclockwise The signal value increases, and the equivalent sampling value decreases by adjusting clockwise.

    2.7 W8 is the overcurrent protection threshold adjustment potentiometer, the overcurrent protection threshold is adjusted counterclockwise to increase, and the overcurrent protection threshold is adjusted clockwise to decrease.

IV. Application examples of KCZ6.3 board

   KCZ6.3 board can be used in three-phase full-controlled bridge, three-phase half-controlled bridge and three-phase half-wave open-loop controllable rectifier circuit. Figure 2 shows the KCZ6.3 board used in three The schematic diagram of the phase full-controlled rectification system, where CT is a current sensor.

  

                     Figure 2

5. Input and output load capacity of KCZ6.3 board

    5.1 Input signal

    The dual AC 18V of the KCZ6.3 board requires a supply current of 0.5A, while the three-phase synchronous signals a, b, and c require a current amplitude of 50mA, given the signal UK requires a current value of 20mA and a voltage amplitude of 0-12V DC.

    5.2 Output load capacity

 +15V, -15V maximum load capacity is 50mA, +24V maximum load capacity is pulse current 300mA, g1゛g6 maximum allowable pulse current is 150mA.