Development background

Under the goal of "carbon peak-carbon neutrality", China's energy revolution is accelerating. To implement the dual carbon goals, the power system takes the lead. In the energy structure with new energy as the main body, photovoltaic and wind power as clean energy will play the main role. In recent years, my country's centralized photovoltaics have developed rapidly, and distributed photovoltaics are not far behind. Among them, distributed includes industrial and commercial photovoltaics and household photovoltaics. Today, household photovoltaics have become the focus of subdivisions in the photovoltaic industry.

Microinverters are indispensable for household photovoltaics. In the circuit topology of microinverters, themainstream solution is staggered parallel flyback. and full-bridge phase-shifted forward typeThe main magnetic components involved are the main transformer (PQ34), current transformer (EE5.0 or ER8.5 SMD type), differential mode inductor (filter), common mode inductor In addition, the auxiliary power supply part includes auxiliary source transformers (EP13, etc.).

Driven by industry trends, Sunlord has developed the main transformer for household photovoltaic micro-inverters - the PQ34 high-frequency transformer series. The product has reached a mature and stable level and can make The overall conversion efficiency of the circuit reaches over 96.5%, and it has the advantages of huge production capacity and stable quality.

Product advantages and uses

Mature and stable products, leading core supplier in the microinverter industry

Independently developed wide-bandwidth, wide-temperature, low-loss magnetic materials, overall circuit conversion efficiency Reaching more than 96.5%

Stable and reliable quality, support customization

Widely used in photovoltaic, energy storage and other fields

Product Features

Work Temperature: -40℃～+125℃

Package size: L38mm×W37mm×H15.5mm ｍmax (height H can be adjusted to 22.0 Max)

Dielectric strength: PRI-- SEC:AC3.75KV 5mA; SEC--CORE:AC3.75KV 5mA

Safety distance: PRI--SEC:≧6.5mm, PRI--CORE:≧4.0mm

Appearance size

The picture comes from Sunlord's internal

Sunlord high-frequency transformer PQ34 series magnetic cores have a variety of different sizes and losses, which can meet different customer requirements. The following are examples of magnetic cores and corresponding losses:

Pictures come from Sunlord’s internals

Examples of specifications and characteristics

Picture from Shun Inside the network

Product application

The PQ34 series high-frequency transformers are mainly used for micro-inverters. The following figure shows the household photovoltaic-micro-inverter application architecture, and the PQ34 transformers are mainly used for MPPT&DC- DC boost section.

Pictures from Sunlord internal

The following is a microinverse topology circuit, and the application position of the PQ transformer has been marked: