top of page
구부러진 금속 라인

Advanced Control Logics

Improved control performances in controlling diameter and pull speed of silicon single crystal growers

Operator Training System

Operator Training System (OTS) is developed using simulation function of PROMONICON.

Central Control and Monitoring System

This system can access 100+ growers to monitor and control.

Image Processing

Key process variables can be obtained through image processing module of PROMONICON.

application_si_2.jpg

Advanced Control Logics

TBB improved the control performances in controlling the diameter and pulling speed of silicon single crystal growers by using

  • Enhanced control logics (feedback control, feedfoward control, iterative learning control, sequenctial control, etc.)

  • Signal processing techniques (median-average filter, bumpless techniques, etc.)

  • Resolution enhancers (PWM, dither, DSM, noise-suppressing parameter adjustment, etc.)

As a result, we overcomed the limitations of the previous control logics and achieved much better control performances:

  • Variance in diameter reduced by 15%

  • Average pulling speed increased by 20% (that leads to higher productivity)

application_si_results.png

Central Control and Monitoring System

TBB designed a central control/monitoring system for Si single crystal growers based on PROMONICON. This system can access 100+ growers to monitor and control the growing process. The topology of the central control/monitoring system for growers is presented as below:

  • Each grower has its own PLC and local control/monitoring system.

  • The local and central control/monitoring system are connected through PLC and TCP communication.

  • The central control/monitoring system can manipulate multiple growers in a simultaneous manner by interfacing with PLCs through TCP communication.

The attributes of the central control/monitoring system include:

  • Redundancy assured: a grower can be controlled by either its own local control/monitoring system or the central control/monitoring system. For examples, the local control/monitoring system will take over control automatically in a bumpless way if the central control/monitoring system is failed, vice versa. 

  • Automatic reporting: the central control/monitoring system collects process data of all the growers and processes them, followed by generating reports in an automatic way. 

  • Designing/applying recipes to multiple growers in an automatic way

application_si_central.png

Operator Training System

Operator Training System (OTS) is developed by using the simulation function of PROMONICON. The OTS consists of a real-time virtual process, an operation/control system, and PLC. 

The real-time virtual process is developed with the simulation module of PROMONICON. The virtual process is defined by transfer functions (i.e., differential equations) and algebraic equations, which emulates important dynamics in the single crystal growing process. The virtual process receives the manipulated variable signals (such as pulling speed, heater power, etc.) determined by the operation/control system through PLC, and sends the emulated measurements (process variables such as ingot diameter, melt temperature, etc.) to the operation/control system through PLC. 

This system is useful to validate the operation/control logics and train the operators. 

application_ots1.png

Image Processing

With the image processing module of PROMONICON, the following key variables (not measurable) to control and operate the silicon single crystal grower can be obtained.

  • Good dip

  • Crystal loss

  • Diameter

  • Melt gap

  • Melt temperature

application_si_image.png
bottom of page