uTransformers are still the preferred method of AC regulation in many applications such as, for example, voltage control of some motors. Also, they are often applied in powering electronic circuits.
For those looking for compact, precision and universal transformers we recommend products by Breve – one of the leading Polish manufacturers in this field. Their components are made with high precision and they are available in a wide range of parameters. They are intended to be mounted in various products, from industrial machines to consumer appliances. What’s more, the manufacturer uses these components to build advanced, universal controllers designed to operate with AC motors, in particular those found in HVAC systems. Breve manufactures special regulators that are compliant with EC fans, too.
Standard transformers still offer one of the simplest and, at the same time, the most effective methods of processing and lowering the mains voltage. When combined with bridge rectifiers and voltage regulators, they help obtain a stable, reliable and sustainable source of power for any electronic circuit. They are applied e.g. in devices powered by alternating current which feature a digital controller operating at the same time (e.g. industrial machines or household appliances). Secondary voltages that can be obtained with the Breve products reach from 6 V to 24 V (at up to 60 VA). Primary windings can operate at the standard 230 V and 110 V voltages, but also at 24 V and 400 V. Obviously, the most crucial feature of the solutions provided in this group is the possibility of direct PCB mounting, which helps save time and production costs of power modules, and also reduce their size. Note that Breve offers such products in various formats – low-profile, cast resin, with a ribbed housing (improved heat exchange), etc. The products meet the requirements of the EN 61558 standard concerning the safety of induction elements.
Autotransformers are a special type of transformers, as both their primary and secondary windings are placed on a single core. What’s more, thanks to a number of taps on the secondary winding, the user can choose from among many outputs with various electrical properties. In the case of Breve products, the main function is to control AC fans using voltage. Thanks to an autotransformer and the right switch, a 5-level control of the shaft’s rotation speed is possible. A crucial advantage of the Breve products is that they are combined with terminal blocks, which means that they can be connected and modified easily. Autotransformers operate at a voltage of 230 V AC.
Another well-developed group of Breve products comprises rotational speed controllers used in AC fans (or in AC motors). Depending on the model, they can be based on a transformer, an autotransformer or thyristors. Some of these products feature a special electronic circuit which provides an additional Soft Start function that prolongs the motor’s life and limits start-up impulses. They also offer a thermostat input for automating the air flow control in a given space. Such solutions are implemented primarily in heating and ventilation systems. Note that Breve also provides industrial controllers with high current capability (up to 10 A) as well as smaller modules for surface or flush indoor mounting (in places such as offices, residential buildings, etc.). Some of them boast an IP54 rating (high dust ingress, splash and washing resistance), which additionally increases the range of their applications. What’s more, the manufacturer offers controllers for single- or three-phase motors. The control itself can be either multi-step or stepless – it depends on the technology used in the device. The electrical connections have been made using typical wiring solutions to ensure a smooth installation and connection.
EC FAN CONTROL
The popularity of EC fans, i.e. the ones based on electronically commutated motors, is still growing, as such components combine durability of AC airflow units with precision control that was previously offered only by DC components. Even though it’s the built-in electronic system that is responsible for controlling the rotation speed of EC elements, they are set up from the outside through an analogue (voltage) signal given at the input. One of the Breve controllers may be used to that end. They supply voltage ranging from 0 V to 10 V DC, which depends on the current setting of the knob placed on the front of the device housing. The products are available in two versions: those powered by the voltage of 10…12 V DC or of 230 V AC. In each case, they are placed in a white, plastic housing adapted to wall mounting.