The "Power Heart" in the Welding Machine

When an arc stably traces across the metal surface, when a welding machine runs continuously in the workshop for hours without stopping—few people realize that the core that determines how thick and how long this welder can be welded is hidden in a fingertip-sized IGBT.。

As the "power switch" of the inverter welding machine, the performance of the IGBT directly determines the overall machine efficiency, temperature rise, and reliability. Lonten has launched an IGBT series product covering 650V/1200V voltage and 40A~60A current range for welding machine applications. With three major advantages: low on-voltage drop, low switching losses, and strong short-circuit resistance, it has become the preferred "core" for welding machine manufacturers.

01 Who is quietly "consuming" the efficiency and lifespan of welding machines? Inverter Welder: The Core of Power Conversion

When the welding machine is operating, the input power frequency AC is rectified, inverted, converted to voltage, and then secondary rectified, then outputs a high-current arc. Among them, the inverter stage is completed by IGBT high-frequency switches—switching frequencies can reach 20kHz-50kHz. IGBTs turn on and off tens of thousands of times per second, with each operation causing conduction and switching losses.

Conduction loss is determined by the saturation pressure drop VCE (sat): the higher the pressure drop, the more severe the welding machine heats up, and the lower the overall machine efficiency.

Switching losses (Eon + Eoff) directly affect the IGBT's own temperature rise: the greater the loss, the larger the heat sink, and the harder it is to reduce the size of the welding machine.

Under dynamic conditions such as arc start, short circuit, and thrust in the welding machine, the IGBT must also withstand instantaneous overcurrent and busbar peak voltages. Once the IGBT fails, it can cause the machine to be destroyed at best, or burn out the entire main control board.

The demand for IGBT varies significantly among welding machines of different power levels. Lonten has summarized the key points for selecting mainstream welding machines:

02 Lonten IGBT's three core technologies solve welding machine pain points. To address these challenges, Lonten Semiconductor has launched the Trench Field Stop IGBT series covering voltage platforms such as 650V and 1200V, and has achieved breakthroughs through the following designs.

Lower conduction voltage drop reduces heat generation

VCE (sat) as low as 1.5V (typical value): Compared to mainstream products, it reduces conduction losses by more than 15%, significantly reducing conduction losses when welding machines are fully loaded;

Positive temperature coefficient: Easy to use in parallel, suitable for high-current welding machine output modules.

Optimize switching losses and improve efficiency

Eon/Eoff precise matching: optimized for welding machine switching frequencies of 15-40kHz, balancing low loss and low EMI;

Low Qrr and short Trr: Optimized built-in freewheeling diode, reverse recovery charge as low as 0.37uC, effectively suppressing peak voltage.

High robustness, adaptable to harsh working conditions

Short-circuit resistance: Passed short-circuit test above 10μs, capable of handling electrode adhesion and other abnormalities;

Wide threshold voltage consistency: minimal V(th) fluctuation, no need for repeated adjustments in mass production.

03 Lonten IGBT Selection Guide to Match Different Power Welding Machines: Below are the preferred models specially launched by Lonten Semiconductor for welding machine applications, covering mainstream power ranges.

Note: The above data are typical values; please refer to the specification sheet for practical applications

04 Test comparison: Lonten IGBT vs. mainstream competitors. Taking Lonten Semiconductor's 650V/40A-class product (LKB40N65UF2B) as an example, it was compared with mainstream competitors of the same specification, M.

Test conditions: VGE=15V, IC=40A, Pulse Width=200 us

Advantages: Lonten LKB40N65UF2B reduces conduction voltage by 15%. At 40A current, the on-power consumption is reduced by about 40A 0.28V = 11.2W, directly reducing overall heating of the welding machine and improving efficiency.

Test conditions: VGE=0V, IF=20A, Pulse Width=200 us 

Advantages: Lonten LKB40N85UF2B diode continues flow pressure reduced by 29%, significantly lowering inverter arm flow losses and significantly improving efficiency.

05 Flexible packaging to accommodate various welding machine topologies: Lonten offers welding machine customers multiple packaging options, balancing cost, heat dissipation, and power density.

TO-247: Mainstream packaging, balanced heat dissipation and electrical performance, suitable for most inverter welding machines.

TO-3P: Efficient heat dissipation in packaging, suitable for welding machines operating under full load for long periods.

TO-247PLUS-3: Increased heat dissipation area, supports continuous current above 50A, suitable for industrial-grade heavy-duty welding machines.

Lonten IGBT ensures welding machines are "stable and durable." Welding machines are rapidly developing toward higher frequency, smaller size, and higher efficiency. Lonten Semiconductor helps welding machine manufacturers effectively solve efficiency and heat consumption challenges with its "low loss + high robustness" IGBT solution, standing out in fierce market competition.

Click the "Sample Application" entry on the homepage of the official website to obtain detailed technical information and samples. 

Consultation hotline: +86-029-8665 8666-ext. 8101 

Email: sales@lonten.cc