Ferrite Core PQ2620 PCB Mounted Transformer For Industrial Power Converter

The PQ2620 is a high frequency PCB mount transformer built on a PQ26/20 ferrite core, designed as the main isolation transformer in a switch mode power supply. It transfers energy from the primary switching stage to the secondary output while maintaining full galvanic isolation between the mains side and the load side, and it does so at switching frequencies where a conventional low frequency transformer of the same power rating would be several times larger and heavier.

The PQ core shape is chosen deliberately for this class of application. Compared with EE or EI geometry of similar volume, the PQ core provides a larger effective cross sectional area relative to its footprint and encloses the winding more completely. The practical result is a better ratio of power handling to board area, a lower leakage field, and a larger surface area for heat to escape from the winding. For a designer who has to fit a given output power into a fixed board outline, this is usually what decides the core shape.

The transformer is supplied as a vertical PCB mount component on a rigid bobbin with through hole pins, which allows it to be inserted and wave soldered as a standard part on an automated line. The winding is layered with insulation tape between primary and secondary and vacuum varnish impregnated, so the assembly resists vibration, humidity and the thermal cycling that industrial equipment experiences over a long service life.

The product is manufactured to order. Turns ratio, primary inductance, output voltages, number of secondary windings, pin configuration, insulation system and creepage arrangement are all defined against the customer circuit and the safety standard the finished equipment must meet.

Note: output power, inductance, turns ratio and pin configuration are defined per application. Approval drawings and samples are issued for your confirmation before mass production. Confirm the applicable safety file reference with your sales contact for your specific part number.

• PQ core geometry for power density. The PQ shape concentrates a large effective core area into a small board footprint and encloses the coil on all sides. This delivers more output power per square centimetre of PCB than an equivalent EE core, which is the reason PQ is specified in supplies where board area is fixed and output requirement keeps rising.
• Low leakage field. Because the winding sits inside a nearly closed magnetic structure, stray flux escaping into surrounding traces and components is low. Less stray flux means less induced noise in adjacent control circuitry and an easier path through EMC testing.
• Controlled leakage inductance. Winding sequence, interleaving and layer arrangement are engineered rather than left to chance, which keeps leakage inductance low and predictable. In a flyback converter this directly reduces turn off voltage spike on the switching device and the energy that the snubber must dissipate.
• Robust insulation system. Layer insulation between primary and secondary, margin tape or triple insulated wire, and vacuum varnish impregnation give a construction that supports reinforced insulation requirements and resists partial discharge over the equipment lifetime.
• Thermally stable at continuous load. Ferrite grade is selected against the customer switching frequency so that core loss is minimised at the actual operating point, and the open PQ structure allows heat to leave the winding rather than accumulate inside it.
• Manufacturing ready. Rigid bobbin, defined pin pitch and through hole termination allow standard insertion and wave soldering, with no manual alignment step required on the customer assembly line.
• Designed around your controller. We work from the topology, input range, output requirement and switching frequency of your circuit, so the transformer matches the controller you have already selected instead of forcing a redesign.

• Industrial switch mode power supplies and DIN rail power supplies
• Industrial control power modules and PLC power sections
• Automation equipment and machine control cabinets
• Motor drives, servo drives and variable frequency drives
• Solar inverters and energy storage power conversion
• Uninterruptible power supplies and industrial backup power
• Telecom and server rectifier modules
• Industrial LED lighting power supplies
• Battery charging systems and DC to DC converter modules
• Test, measurement and laboratory instrumentation
• Medical equipment power supplies requiring reinforced isolation

Typical circuit positions include the main transformer in a flyback converter, the power transformer in a forward or half bridge topology, and the resonant transformer in an LLC stage where controlled leakage inductance is used as part of the resonant tank.

• Established in 2000, with 26 years of continuous experience in magnetic components and power solutions for industrial control and power electronics.
• A 10,000 square metre self owned factory with 8 complete production lines, which keeps capacity, process control and delivery schedule in house rather than subcontracted.
• High frequency transformer design and winding are core in house processes, supported by a 20 person R&D team and a 20 person quality control team covering incoming material and outgoing product inspection.
• Certified management system: ISO 9001 for quality and ISO 14001 for environment. Products comply with RoHS and REACH, with CE, CB, UL and cUL coverage across the product range.
• Annual export value of 42 million USD, serving North America, Northern Europe, South America and Southeast Asia, including established industrial equipment brands.
• An 11 person export team providing direct technical communication in English, so engineering questions are resolved without a trading company in between.

• Higher power in the same board area. PQ geometry gives a better power to footprint ratio than EE or EI alternatives of comparable size.
• Lower switching stress. Controlled leakage inductance reduces voltage spike on the primary switch, which allows a lower rated device and a smaller snubber, saving cost at the system level.
• Safety ready construction. Reinforced insulation options and UL recognised materials shorten the certification path for the finished equipment.
• Consistent inductance batch to batch. Controlled gapping and winding tooling, with electrical testing before packing, keep every unit inside the tolerance window your control loop depends on.
• Designed to your circuit, not to a catalogue. Turns ratio, inductance, auxiliary windings and pinout are all defined against your schematic.
• Free electrical design service. Send the specification and we will propose the core grade, gap, turns and wire, then confirm the design with samples.