Power Semiconductor Manufacturer | IPM IGBT SiC | SHYSEMI

Direct Current (DC) VS Alternating Current (AC), and Their Respective Application Fields

Sun, 30 Aug 2026 20:23:49 -0700

The most intuitive distinction between alternating current (AC) and direct current (DC) lies in the directional behavior of the current. SHYSEMI notes that DC is analogous to a car traveling in a single direction—flowing steadily along one path—whereas AC resembles a swinging pendulum, with the current direction reversing periodically. This fundamental difference determines their respective application scenarios and technical characteristics.

Figure 1: Waveform Comparison of Direct Current and Alternating Current

What is Direct Current?

DC : The magnitude and direction of the current remain essentially constant, flowing continuously in a single direction.

What is Alternating Current?

AC : The magnitude and direction of the current vary periodically with time, alternating back and forth.

Generation Methods of AC and DC

From an application perspective, DC is typically generated by batteries, photovoltaic (solar) panels, or DC generators, delivering a stable output voltage.
AC is primarily produced by AC generators. Through the principle of electromagnetic induction, a rotating coil within a magnetic field generates a periodically varying current. This alternation occurs at a very high speed; under standard household conditions of 50 Hz AC, the current direction changes...Read More

Freewheeling Diode: The Inductor's Best Friend

Tue, 11 Aug 2026 02:30:37 -0700

R&D: Jack Liu

Jack once worked at Huahong Group. With his profound expertise in wafer and IGBT module design, he led our research and development efforts.The team he led was dedicated to enhancing the heat dissipation performance, conversion efficiency and durability of electric vehicles, solar inverters and industrial motor drives.

What is freewheeling diode?

The term "Freewheeling Diode" is a literal translation from English. In the industry, it's commonly known as a "Flyback Diode" or "Freewheeling/Flywheel Diode," abbreviated as FWD. Many power electronics datasheets and IGBT module documents stick with this literal translation, so don't be surprised when you see "freewheeling" everywhere — it's not talking about a bicycle!

1. So, What Does It Actually Do?

Picture this: you have an inductor (or a motor winding, relay coil, transformer) — You connect a diode in reverse parallel across this inductive load.

Its one and only job? No, when the switch suddenly snaps open, it gives all that stored magnetic energy a safe escape route — preventing it from throwing a tantrum in the form of a massive voltage spike that would otherwise fry your MOSFET, IGBT, or transistor faster than you can say "Oops."

Why "Freewheeling"? Think of inductor current...Read More

SHYSEMI SiC IPM: Silicon Carbide Upgrade at No Extra Cost

Tue, 28 Jul 2026 19:52:38 -0700

R&D: Jack Liu

Foreword: The Material Revolution in Power Semiconductors

Driven by global carbon neutrality initiatives, power electronics systems are accelerating toward higher efficiency, greater power density, and improved reliability. As the "heart" of any inverter-driven system, the Intelligent Power Module (IPM) directly determines the overall energy efficiency and service life of the end product.

After decades of refinement, conventional silicon-based IGBT IPMs are approaching the physical limits of the material itself. Silicon carbide (SiC) — the flagship of third-generation wide bandgap...Read More

Comprehensive Overview of IPM Failure Modes: Analysis and Solutions by SHYSEMI

Mon, 27 Jul 2026 02:04:01 -0700

R&D: Jack Liu

*This article contains 1,800 words and takes 10 minutes to read.

An Intelligent Power Module (IPM) is a core power device that integrates IGBT power switches, gate drive circuitry, and protection detection circuits into a single package. It is widely used in variable-frequency drives, inverters, industrial motor drives, and similar equipment. Most IPM failures stem from electrical stress, thermal aging, mechanical stress, and power supply anomalies. The common failure modes fall into four main categories — electrical, thermal, insulation & mechanical, and drive & logic — each with distinct symptoms, root causes, and failure characteristics detailed below.

1. Electrical Failures (High-Incidence, Catastrophic)

Electrical faults are the most common and most destructive IPM failure type. They typically occur instantaneously and...Read More

PCB Layout Guide for Inverter Refrigerator IPM Modules: Thermal Management, EMC, and Dedicated Routing

Tue, 21 Jul 2026 23:45:36 -0700

*This article is approximately 2,000 words long, with a reading time of about 5 minutes.

Introduction

Inverter refrigerators rely on IPM (Intelligent Power Module) and IGBT devices to drive compressors, enabling wide-temperature energy savings and low-noise operation. However, the high-frequency switching of IGBTs generates sharp dv/dt and di/dt noise. In mass production, this frequently leads to critical issues such as current-sampling distortion, false protection triggering, EMI non-compliance, and catastrophic module failure due to overheating.

Proper PCB layout is the single most critical factor in determining the reliability of an inverter drive system. Leveraging the characteristics of SHYSEMI’s full lineup of refrigerator-grade power devices—including TOLL-8L MOSFETs, three-phase IPMs, and discrete IGBTs—this guide breaks down practical layout techniques across six key dimensions: functional zoning, power loop design, thermal management, high-voltage/low-voltage isolation, grounding, and current-sensing routing. Complete with standard layout principles, this guide serves as a practical reference for refrigerator electronic control board design, mass-production troubleshooting, and engineering training.

1. Functional Zoning and Layout Rules for Inverter Refrigerator PCBs

1.1 Four Distinct Functional Zones

high-power IGBT (Insulated Gate Bipolar Transistor) modules is absolutely critical. To achieve precise temperature monitoring, SHYSEMI (Shenhuaying Semiconductor) integrates NTC temperature sensors across its entire lineup of high-performance IGBT modules.

What is an NTC Thermistor?

NTC stands for Negative Temperature Coefficient. The defining characteristic of an NTC thermistor is that its electrical resistance decreases exponentially as the temperature rises.

NTC Applications in IGBT Modules

During high-power operation, IGBT chips generate substantial Joule heating. SHYSEMI integrates the NTC thermistor directly onto the IGBT substrate or in close proximity to the chips to monitor internal junction or case temperatures in real time.

By accurately measuring the change in NTC resistance, the gate drive control system can track dynamic temperature shifts instantly. This enables:

Thermal Protection: Triggering derating operation or shutdown protection when temperatures exceed safe thresholds.
Optimized Thermal Management: Dynamically adjusting cooling fan speeds or liquid coolant flow rates to improve overall system efficiency and lifespan.

Understanding Inverter Dead Time: Causes, Impacts, and Solutions

Tue, 07 Jul 2026 01:01:47 -0700

In motor drives, solar inverters, energy storage systems (ESS PCS), UPS, and industrial power supplies, dead time is a critical control system parameter.

An optimal dead time protects power devices like IGBTs and MOSFETs from catastrophic shoot-through failures. However, an improperly configured dead time distorts the output waveform, lowers efficiency, and degrades control accuracy. Balancing dead time is essential for power electronics optimization.

At SHYSEMI, a specialist in power semiconductor R&D, we carefully balance device switching characteristics and dead-time control strategies. Our advanced IGBT modules, Intelligent Power Modules (IPMs), and motor drive solutions help clients maximize system reliability and conversion efficiency.

What is Inverter Dead Time?

Dead time (also known as interlocking time) is a brief delay blanking period intentionally...Read More

600V IPM Module for Industrial Robotic Arms

Mon, 06 Jul 2026 01:28:50 -0700

As industrial automation continues to advance, industrial robots and collaborative robots (cobots) demand servo drive systems that are smaller, more precise, highly reliable, and resistant to electromagnetic interference. At the heart of every servo drive is the power module, which directly impacts positioning accuracy, motion stability, and system lifetime.

SHYSEMI has developed a dedicated 600V Intelligent Power Module (IPM) specifically for industrial robotic arm servo drives. Optimized for robot joint applications, this solution is ideal for both compact and heavy-duty industrial robots, making it an excellent domestic alternative to imported power modules.

Built on a highly integrated 7-in-1 architecture, the SHYSEMI IPM replaces traditional discrete component designs that require complex wiring, occupy more PCB space, and increase system failure rates. The module integrates a PFC stage, three-phase inverter, high-voltage gate driver IC, protection circuits, and temperature sensing, providing a complete power solution for 100 W to 3.5 kW servo motor drives.

What is a Fast Recovery Diode (FRD)?

Fast Recovery Diodes (FRDs) are widely utilized in high-frequency circuits, switching mode power supplies (SMPS), inverters, and motor drives due to their short reverse recovery times and excellent switching characteristics.

When selecting the right FRD for your design, what specific specifications should you look for? SHYSEMI has compiled a comprehensive guide to the 9 essential parameters of Fast Recovery Diodes to help optimize your component selection.

1. Reverse Recovery Time (trr)

Definition: Reverse recovery time is one of the most critical parameters of an FRD. It defines the time interval required for the diode to transition from a forward-conducting state to a reverse-biased (blocking) state. Specifically, it is measured from the moment the forward current crosses zero to the point where the reverse recovery current decays to a specified low value (such as the steady-state reverse leakage level).

Impact: A shorter trr yields faster turn-off speeds and lower switching losses, making the diode ideal...Read More

Decoding 600V–650V Power Semiconductors: Si SJ MOS vs. SiC MOS vs. GaN HEMT

Wed, 01 Jul 2026 02:11:22 -0700

The 600V–650V voltage node has become the ultimate battleground for high-frequency, high-efficiency, and high-power-density power electronics design. Today, three distinct technologies dominate this space: Silicon Superjunction MOSFETs (Si SJ MOS), Silicon Carbide MOSFETs (SiC MOS), and Gallium Nitride High Electron Mobility Transistors (GaN HEMT).

To give you a precise, data-backed selection guide for your next high-frequency power supply, energy storage system, or industrial motor drive, SHYSEMI cross-evaluated the latest device platforms from top-tier global manufacturers, including Infineon, STMicroelectronics, onsemi, and Toshiba. Here is how they stack up.

1. Device Architecture and Physical Foundation

The root of all performance differences lies under the hood. The physical layout and material properties of these three devices dictate how they behave under real-world operating conditions.

1.1 Si SJ MOS (Silicon Superjunction)

A mature, vertical structure where the source and drain are located on opposite sides of the die. It relies on alternating, tightly...Read More