1. What are the dimensions and weight of the existing modules?

According to the current module packaging form, it is divided into 6 kinds of shapes. The specific specifications, dimensions and weight are as follows:

2. The constituent materials in the module

The component materials of the module: Thyristor, DCB (Ceramic Copper Clad Laminate), phase shift trigger control circuit, (protection circuit, feedback circuit, current, voltage sensor, single-chip microcomputer and above are included in the functional module) heat dissipation base plate, input and output electrodes, control signal Port and other components.

3, the chip used inside the module

uses imported glass passivation square chip, produced in Germany. The chip withstand voltage of the module is 1200-2200V

4. Introduction to the internal insulation of the modules

The isolation method in the module is: the thyristor and the heat dissipation base plate are separated by a DCB ceramic copper clad plate, the dielectric strength VISO≥2500VAC, the trigger circuit and the thyristor main circuit are electromagnetically isolated. The dielectric strength between them is ≥2000V. It is protected by elastic silicone gel and sealed with epoxy resin.

5, the circuit form of the module

According to the needs of the load, the main circuit design of the thyristor mainly includes four circuit forms: three-phase rectification, three-phase AC, single-phase rectification, and single-phase AC.

6. What is the temperature coefficient of the output voltage of the module?

The temperature coefficient is 600PPM/℃.

7. What is the rate of increase of the current (di/dt) and voltage (dv/dt) of the module?

Current rise rate: 100A/μS 500V/μS

8. Whether there is protection function in the module

Ordinary thyristor modules generally do not have protection inside. Functional products such as constant current and constant voltage control modules, intelligent motor control modules, and dual closed-loop DC speed control modules have overcurrent, phase loss, and overheat protection functions, according to customer needs. Type modules can also be customized with various protection functions.

9. The control signal of the module

±l2V regulated power supply requirements

voltage range

+12V ±0.5V, ripple voltage is less than 30mv; -12V±0.5V, ripple voltage is less than 30mv; for ±12V power supply accuracy is required ±0.5V; ripple voltage ≤10mv

current capability

The current of the ±12V power supply must be more than 2 times the actual working current. If a transformer rectified regulated power supply is used, the filter capacitor must be greater than 1000μF/25V.

10. Will harmonics be generated when the module is working? How much is the impact?

The harmonics generated by the module during operation are the same as the traditional thyristor circuit, which will have an impact on the grid, but it is not serious. It is not a superposition of harmonics and does not affect the normal operation of other equipment.

11. What is the relationship between module input voltage and output voltage?

AC module Vout=0~1.0Vin, three-phase rectifier module Vout=0~1.35Vin. Single-phase rectifier module Vout=0~0.9Vin.

12. Is the module an open-loop control system or a closed-loop control system?

The thyristor smart module (such as full-control rectification, AC, etc.) is an open-loop control system; functional products with functional modules (such as constant current and constant voltage control modules, intelligent motor control modules, dual closed-loop DC speed control modules, etc.) are a Closed loop control system.

13. What is the difference between the use of an open-loop module and a closed-loop module? What is the difference in control?

The open-loop module changes with the load and the power grid, and the closed-loop module does not change with the change within a certain load and power grid range (power grid ±20%, load change 60%). Open-loop module control power supply uses +12V, and closed-loop module control power supply uses ±12V.

14, the thyristor trigger pulse form in the module

The thyristor trigger uses a wide pulse trigger, and the trigger pulse width is about 4ms (milliseconds).

15. Is the main circuit of the thyristor module fully controlled or half controlled? Is the trigger circuit fully controlled or half controlled? What is the difference between the trigger voltage of full control and half control? What is the difference in waveform?

The main circuit of the thyristor is a fully-controlled bridge, and the trigger circuit is divided into half-controlled and fully-controlled. The half-control trigger voltage is 0~10V, and the full-control trigger voltage is all on after 7V. The half-control module waveform diagram has only three thyristor waveforms in one cycle, and the full-control module waveform diagram has six thyristor waveforms in one cycle.

16. What is the isolation method between the main circuit of the module and the trigger circuit? What is the isolation voltage?

There are two isolation methods. The solid state relay adopts photoelectric isolation, and the other modules adopt electromagnetic isolation, and the isolation voltage is 2500VAC.

17. Why do modules need to add heat sinks? How many ways are there to dissipate heat?

When the thyristor module is working, due to its own pressure drop, it will generate a lot of heat. If it is not dissipated in time, it will affect the operation of the module. The heat dissipation methods are: water cooling, forced air cooling, natural cooling, and forced air cooling is generally recommended.

18. What is the principle of module selection? What are the requirements for ambient temperature?

Selection of module current specifications:

Resistive load: The nominal current of the module should be 2 times of the rated current of the load. Inductive negative OR: The nominal current of the module should be 3 times the rated current of the load.

Environmental requirements:

The environmental adaptation temperature is -25℃～+45℃. The workplace must be dry, ventilated, dust-free, and non-corrosive.

19. What are the internal protections of these types of modules? In what way are they implemented?

Constant current and constant voltage control module, double closed-loop DC speed control module, intelligent motor control module have overcurrent, overheating and phase loss protection inside. Other modules are not protected, you can customize the protection module, the general production cycle is 7-10 days. The current and voltage sensor detects whether the working current and voltage of the module exceed the specified value, and automatically cuts off the control signal when it exceeds the specified value.

20. Does the module need to add a freewheeling diode?

The module does not need to add a freewheeling diode, because the main circuit of the module is a fully controlled main circuit, and it will not lose control when the inductor is discharged. (Semi-controlled customized modules must add diodes)

21. Can the AC module be used for speed regulation? What is the effect of soft start? Can overcurrent protection protect the motor?

The AC module cannot be used for AC speed regulation. It can be used for soft start to reduce the starting current, reduce the impact on the power grid, and avoid other equipment malfunctions during startup, and the effect is better.

22. What are the precautions for the application of DC speed control module?

When using the DC speed control module, a matching tachogenerator, a suitable excitation power supply, whether the armature voltage is 220V or 440V, and a smoothing reactor above 4KW are required.

23. What is the difference between an AC module and a voltage regulator?

Voltage regulator is equal power transmission, isolated from the grid. The module is not isolated from the grid, and the transmission power is controlled by the module current.

24. Can the AC module be used for constant torque load? Is the control torque motor appropriate?

The AC module cannot be directly used for constant torque loads. The torque motor is a high rotor resistance motor, and the speed regulation effect of the module is better.

25. Is there any interference in the power feedback?

Using the rectifier module for electric energy feedback, the user asks: Will there be grid interference? The answer is basically no interference. Because the thyristor rectifier circuit is used to feed electrical energy back to the grid, it takes advantage of some of the characteristics of the rectifier circuit. Without changing any parameters of the original grid, external energy sources are added to the grid along the sinusoidal current of the grid. It is not a high-frequency inverter process. It uses high-frequency oscillation to add an external power source to the grid with high-speed pulse current.