Efficiency measurements on electric motors

Increasingly, electric motors are controlled with variable speed drives. This is to achieve higher efficiency in control. But how efficient is this motor control actually? For accurate measurements of the entire drive, we need to measure the entire drive chain. In this example, we assume a three-phase AC supply which is rectified to a DC supply for the inverter. We (...)

Charging standards

There are a large number of applicable standards in the field of electro mobility. International standards that define the requirements of all equipment to ensure safe use. Consider standards that apply when developing components such as the inlet and outlet plugs used for charging. Charging points, the electric vehicle and communication interfaces are also subject to imposed standards. Due to (...)

Smart charging technologies

Will smart charging be the future? Smart Charging or smart charging is a broad term used to describe smart technologies that can remotely control the charging transaction. There is currently a rapidly increasing use of electric vehicles and simultaneous charging brings peak loads. This can cause negative impacts such as power outages on power grids and energy transmission infrastructure. However, (...)

Battery testing

When we think of battery testing, we always immediately think of safety and quality. We all know the picture of the burnt-out Tesla. Or the story of the new Samsung Galaxy Note 7 phone that could spontaneously catch fire due to a construction fault. How can we avoid such situations as much as possible and minimise the consequences? And then (...)

The bipolar amplifiers of TTMS

Bipolar amplifiers (also called four quadrant amplifiers) are capable of generating both voltage and current in both positive and negative. We at TTMS have a very wide line of bipolar amplifiers. Amplifiers with power ranges from a few watts to more like a Mega Watt. Voltage ranges run up to 700Vac and currents into the kA. Exceptional in this category (...)

The bi-directional amplifiers of TTMS

Bi-directional amplifiers (also called two quadrant power supplies or unipolar power supplies ) are capable of covering two quadrants in terms of voltage or current. We see this a lot in the application of charging and discharging batteries. Always a positive voltage but the current can be either positive or negative. Again, we have range from nV to 2250V, from (...)

Uni-directional amplifiers from TTMS

Uni-directional amplifiers actually consist of two main categories: DC power supplies or DC loads. This in turn can be subdivided into linear and switched-mode power supplies/loads. Depending on the models, we can then divide into constant voltage, constant current, constant power and, for loads, constant resistance as well. Among the loads, we now also see more and more regenerative DC (...)

Uni-directional, Bidirectional or Bipolar amplifier

Another important element to consider is selecting a configuration with source and sink capabilities. An amplifier with absorbing capability can be much pricier than a standard sourcing amplifier. Depending on the application, the simulation setup needs to supply power to a load (known as sourcing) and/or to be able to absorb power (known as sinking). For example, the energy generated (...)

Linear or switching amplifier at PHIL

Linear amplifiers operate in the linear region of semiconductor components. These amplifiers normally have a good frequency response above 10kHz. A disadvantage of these amplifiers is that they are often less efficient and large in size. This must be taken into account in high-power applications. Switching amplifiers operate in the saturation region of the switching element. By design, they are (...)