KCZ6.1< font color="#990000" size="3">Thyristor three-phase full control (half control) bridge phase shift control board

I. Overview

    KCZ6.1 thyristor three-phase full control (semi-control) bridge phase shift trigger control board is our company based on the users opinions on the original TC-Z6.1 board in the original TC- It is further improved and developed on the basis of the Z6.1 board. Compared with the TC-Z6.1 board, it has the following advantages:

    1. The external connection connector changes the old-fashioned 22-wire connector with double-sided contact to a new type connector, so the contact is more reliable and the connection is not easy to connect wrongly.

    2. The input signal and output signal are divided into three connectors, which makes the application more convenient for users.

    3. The printed circuit board has increased the soldering resistance, characters and anti-corrosion technology, which is more reliable to use and easier to repair.

    4. A shielding layer is added around the printed board, which has better anti-interference performance, and mounting fixing holes are added around it, so there is no need for a plug-in box during use, which meets the installation needs of different users.

    5. On the basis of the original TC-Z6.1 board, a given integrator is added, thus avoiding the impact of the output voltage or current at the given time of the user step, so the application performance is more convenient and ideal!

    6. On the basis of the original KC-Z6.0 board, a differentiator is added to satisfy that when the user set voltage is the largest, the output voltage of the controlled system is the largest. When the user set voltage is the smallest, the output voltage of the controlled system is the lowest, which is more conventional Habits and logic!

    7. On the basis of the original KC-Z6.0 board, a fault protection is added, so that the user can conveniently use it for over-current (or over-voltage) protection. After the protection, the trigger pulse of the control board is blocked, and a set of 220V is given at the same time /1A (or 380V/0.5A) normally closed contact signal, so that users can conveniently use to disconnect the main circuit of their application system to ensure the safety of the system!

II. Conditions of use

    1. Altitude: 1500m;

    2. Ambient temperature: -10桫 +45;

    3. The maximum corresponding relative humidity of the air: 90% (when the relative ambient temperature 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, basic working principle

    The basic working principle of the KCZ6.1 board is basically the same as that of the TC-Z6.1 board. It uses the TC787 developed and produced by our company as the core unit. TC787 is a high-performance 18-pin standard dual in-line integrated circuit, which integrates constant current source, phase-shift logic, zero point identification, pulse distribution, pulse modulation, anti-interference circuit and other functions in one, one piece can replace 5 pieces of KJ (or KC) series A combination of integrated circuits or a combination of 3 TCA785 and KJ041 and KJ042. Therefore, the anti-interference performance is better, and the performance is more superior. Its application greatly reduces the size of the printed board. At the same time, the KC-Z6.1 board adds a given integrator and overvoltage (or overcurrent) protection unit on the basis of the original TC-Z6.1 board.

Four. Main technical parameters

    The main technical parameters of the KCZ6.1 board are as follows:

    1. The input synchronization signal is three-phase, and its phase voltage is AC 14V30V and it can work normally, and the current demand for the synchronous power supply is less than 100A.

    2. The input power supply voltage is dual AC 18V, so the board can generate the 15V required by the user's three-phase control system (its load capacity is 50mA) and the +24V power supply required to trigger the final stage (the load capacity is pulse current 1A).

    3. Output six channels (for three-phase full-control bridge triggering) or three channels (for three-phase half-control bridge triggering) trigger pulses, including pulse power amplifier part, users only need to match the six-unit or three-unit thyristor trigger produced by our company The pulse final stage board and a given potentiometer can be connected to form a three-phase AC voltage regulation or DC motor speed regulation or other systems.

    4. It contains a fault protection unit (overvoltage or overcurrent protection). After protection, in addition to blocking the output pulse of the control panel, it also provides a set of 220V/1A or 380V/0.5A normally closed contact signals at the same time, so that users can conveniently It is used to break the main circuit of the controlled system in the event of a fault to ensure the safety of the entire system.

    5. It contains a given integrator, and the integral time is adjustable, so that users can easily use it to realize the soft start function.

    6. The installation dimensions are shown in Figure 1, the four holes are all 4, and the hole distance is shown in Figure 1.

    7. Maximum external dimensions: lengthwidthheight=152mm115mm28mm.

 

Figure 1
    The physical appearance of the KCZ6.1 board and the installation dimension drawing of the components

V. User instructions and usage methods

    1. The schematic diagram of the layout of the printed board components of the main parts of the KCZ6.1 board is shown in Figure 1. The potentiometers W1, W2, and W3 are used to adjust the balance of the three-phase synchronous voltage, and they are rotated clockwise and sent to the integrated circuit TC787 tube. The equivalent synchronization voltage of the pin decreases, and the equivalent synchronization voltage sent to the TC787 pin is adjusted counterclockwise to increase. W4 is the maximum -angle limiting adjustment potentiometer. Turn clockwise to reduce the maximum -angle limiting value, and turn counterclockwise to increase the maximum -angle limiting value. W5 is the differentiator bias given potentiometer, clockwise adjusts the bias voltage to increase, and counterclockwise adjusts the bias voltage to decrease. W6 is the actual voltage or current measurement value signal adjustment potentiometer of the controlled system. Clockwise adjusts the actual voltage or current measurement value to decrease, and counterclockwise adjusts the actual voltage or current measurement value to increase. W7 and W8 are the adjustment potentiometers for the rise and fall time of the given integral, clockwise adjust the rise and fall time of the given integral to shorten, and counterclockwise adjust the rise and fall time of the given integral to make it longer. W9 is a fault (overvoltage or overcurrent) protection threshold adjustment potentiometer. The fault protection threshold is adjusted clockwise to decrease, and the fault protection threshold is adjusted counterclockwise to increase. W10 is the potentiometer used when debugging the control board, and it has no effect on the user.

    2. The ~18V, , ~18V on the left side of the KCZ6.1 board are respectively connected to the secondary voltage of the user power transformer, and its current capacity is 0.5A, and a, GND; b, GND; c, GND are respectively connected to the secondary voltage of the synchronous transformer Phase voltage, its current capacity is 50mA, +15V and -15V are provided to the user system, and its load capacity is 50mA, the user only needs to connect a quarter watt 2K resistor and a half watt between -15V and GND One watt 4.7K potentiometer is connected in series with the network, and the middle point of the potentiometer is connected to the UK end of the connector to adjust the given voltage through the potentiometer to adjust the three-phase thyristor rectifier bridge (or three-phase voltage regulating network) The remaining terminal S is used to realize the pulse sealing in the case of a fault. It is an output signal, which is a high level when the fault occurs, and its required current capacity is tens of microamperes.

    3. The +24V, g1; +24V, g2; +24V, g3; +24V, g4; +24V, g5; +24V, g6 on the right side of the KCZ6.1 board are respectively used to connect the input terminals of the user trigger pulse final stage board.

    4. Between A and B on the right side of the KCZ6.1 board is a normally closed contact with a capacity of 220V/1A or 380V/0.5A, which can be used by users to string in their own main circuit contactor line package branch, so as to break the controlled circuit in case of a fault. The main circuit of the system.

    5. When the KCZ6.1 board is used in the on-board over-current protection mode, the Uf terminal in its left connector S2 is connected to the current sampling signal input, and when the KCZ6.1 board is used in the on-board over-voltage protection mode to work , The Uf terminal in the connector S2 on the left side is connected to the voltage sampling signal input. If the overvoltage or overcurrent protection in the KCZ6.1 board is not used, the S terminal can directly input a corresponding fault state when the high level ( Higher than 10V) signal to realize the external protection function.

    6. The KCZ6.1 board is used as an example of the actual system. Figure 2 shows the principle circuit diagram of the KCZ6.1 board used in a three-phase full-control bridge system in the overcurrent protection mode in the application board. CT in the figure is a current sensor.


   Figure 2

    7. KCZ6.1 board output and input load capacity

    7.1 Input signal: The dual AC 18V of the KCZ6.1 board requires a supply current of 0.5A, and the contact capacity between A and B is 220V/3A, 380V /1A, and the three-phase synchronous signals a, b, and c require a supply current of 50mA and a phase voltage of 30V.

    7.2 Output load capacity: 15V power supply, the maximum load capacity is 50mA, the maximum load capacity of 24V is 300mA, and the maximum pulse current allowed for g1g6 is 150mA.

    8. When the KCZ6.1 board is used in a three-phase controllable rectifier system without a transformer in the main circuit, it is recommended that the synchronous transformer be connected to /Y-11, and when the KCZ6.1 board is used in a three-phase AC rectifier system without a transformer in the main circuit When the system is triggered by voltage or three-phase zero-crossing, it is recommended that the synchronous transformer be connected to Y/Y-12. When the main circuit has a transformer, the connection of the synchronous transformer should match the connection of the transformer in the main circuit.