Switchable valves and DC controllers

The experiments are carried out on training panels in panel frames.

Objectives

• Protective measures and electrical safety
• Circuit assembly and connections according to circuit diagrams
• Use of Power Analyser CASSY Plus

Static converter valves with gate turn-off can be used to assemble a variety of DC controllers (DC/DC converters). Three different control methods are used for this:

• Pulse width modulation
• Pulse sequence modulation
• Two position control

Highlights:

• To protect the semiconductor components, all experiments are only tested with a low voltage.
• The measurements are carried out with the Power Analyser Plus.
• All measurement channels are potential-free and can therefore be used freely.
• All measurements can be carried out with or without a computer.

All functions of the Power Analyser CASSY can be operated quickly and directly via the display, the rotary wheel and the buttons on the unit. All settings and measurement results can be saved on the unit and quickly called up again later or simply downloaded.

In addition, the Power Analyser CASSY is fully controllable in real time via RJ45 Ethernet, W-LAN and USB-C interfaces.

These interfaces can be used by the following software:

• CASSY Lab 2 for drives and energy systems,
• MATLAB® and LabVIEW ™
• Lab Docs Editor Advanced

The following integrated servers are available in the Power Analyser CASSY for the local media connection of at least four end devices simultaneously.

For more details, see product data 727110 or 727111 Power Analyser CASSY.

The individual equipment is equally suitable for student experiments in the laboratory with low voltage 90 / 156 V DC) and - with a mobile trainer - for teacher demonstration in the classroom. The experiments are carried out according to the manual.

The target group is made up of commercial apprentices and students of electrical machine construction. The course offers experiments at an intermediate level and also allows for the necessary insight into machine behaviour for scientific interpretation at undergraduate level. The media connection makes the experiments suitable for demonstration in the classroom or a lecture hall.

In the following configurations there are further extended experiments with switchable valves and DC controllers:

• E2.4.3.2 Switched-mode power supplies
• E2.4.3.3 Inverters

Topics

• Thyristor with quenching circuit
• Power MOSFET
• Insulated Gate Bipolar Transistor (IGBT)
• Forward characteristics
• Blocking and switching characteristics
• Control of DC controllers
• Boost/buck converter
• DC controller with thyristor with quenching circuit, PWM
• Control characteristics at constant load current
• DC controller with MOSFET, PWM, PFM and two-point control
• DC controller as boost converter, PWM and two-point control
• DC controller with IGBT as inverting boost and buck converter with PWM
• Control characteristic with constant input current