Sunlord Developed the PQ34 High-frequency Transformer Series of Main Transformers for Residential Photovoltaic Microinverters

PublishTime： 2024-01-13 Article Source：Sunlord News

Under the goal of "carbon peaking and carbon neutrality", China's energy revolution is accelerating. In the energy structure with new energy as the main body, photovoltaic and wind power, as clean energy, will play the role of the main force. In recent years, China's centralized photovoltaic has developed rapidly, and distributed photovoltaic is not far behind. Among them, distributed include industrial and commercial photovoltaics and residential photovoltaics. Nowadays, residential photovoltaics have become the focus of subdivisions in the photovoltaic industry. The indispensable thing for residential PV is the microinverter, and the mainstream scheme is staggered parallel fly back type and full bridge phase-shift forward type in the circuit topology of the microinverter. The applied magnetic devices include the main transformer (PQ34), current transformer (EE5.0 or ER8.5 SMD types), differential mode inductor (filtering), common mode inductor, and also auxiliary transformer in auxiliary power.

Driven by industry trends, SUNLORD has developed the PQ34 high-frequency transformer series of main Transformers suitable for residential photovoltaic microinverters, which has reached a mature and stable level, which can make the overall conversion efficiency of the circuit reach more than 96.5%, and has the advantages of huge production capacity and good consistency.

Product Benefits

Wideband and low-loss magnetic materials contribute to improving conversion efficiency.

Diverse product sizes meet various customer power supply needs.

Fully automated production, good consistency.

Widely used in microinverter and portable energy storage fields.

Features

Operating temperature: -40℃ ～ +125℃

Package Size: L38mm×W37mm×H15.5mm Max. (H can be adjusted up to 22.0mm Max.)

Dielectric Strength: PRI-SEC: AC3.75kV, 5mA; SEC-CORE: AC3.75kV, 5mA.

Safety Distance: PRI-SEC: ≥ 6.5mm, PRI-CORE: ≥ 4.0mm.

Applications

PQ34 series high frequency transformer is mainly used for microinverter, the figure below shows the microinverter application architecture of residential photovoltaic, and the PQ34 series transformer is mainly used for MPPT&DC-DC step-up part.

Fig.1

The following is the microinverter topology circuit, and the PQ34 series transformers application location is marked:

Fig.2

Shape and Dimensions

Fig.3

Sunlord's PQ34 series cores are available in a variety of sizes and losses to meet different customer requirements. The following are examples of cores and their corresponding losses:

Fig.3

Examples of Specifications

Fig.4

Conclusions

In addition to the high frequency transformer PQ34 series, Sunlord has more sizes for microinverter, such as PQ36, PQ38, PQ40, PQ47, etc, which can meet the needs of customers for higher power customization (300W-500W/piece), and sincerely welcome public to come to consult.

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