News
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Why Proper NTC Selection Matters in EV OBC Circuits
In electric vehicle on-board chargers (OBCs), DC bus capacitors typically range from 470μF to 2200μF. Without effective pre-charge protection, the large inrush current generated during startup can damage power semiconductors, relays, and other critical components. Repeated current surges may also...Read more -
Case Study: Eliminating Electrolytic Capacitor Lead Failures
A leading inverter air conditioner manufacturer experienced intermittent failures in outdoor controller boards during production and field operation. After investigation, the failures were traced to mechanical stress on electrolytic capacitor leads in both the switching power supply and co...Read more -
Ceramic Capacitors VS Film Capacitors in High-Frequency Applications
When designing high-frequency, high-voltage circuits, a common question engineers ask is: Should I choose film capacitors or high-voltage ceramic capacitors? In high-frequency circuits, two parameters largely determine capacitor performance: Equivalent Series Resistance (ESR) Equivalent Se...Read more -
What Should You Do If a Varistor Fails
Varistors are widely used in power supplies, surge protectors, industrial equipment, and home appliances to protect circuits from lightning strikes and transient overvoltage events. However, after absorbing excessive surge energy, a varistor may eventually fail. Knowing how to identify an...Read more -
Select the Right Electrolytic Capacitor for Power Designs
Electrolytic capacitors remain one of the most widely used components in power supplies, motor drives, renewable energy systems, and industrial equipment. Their high capacitance density and cost-effectiveness make them ideal for energy storage, ripple filtering, and voltage stabilization. ...Read more -
Case Study – Solving Resistor Cracking After PCB Assembly
A customer manufacturing industrial control boards experienced intermittent failures during final testing. Several resistors showed open-circuit conditions after PCB depaneling, resulting in reduced production yield and increased rework costs. JEC’s Analysis Initial investigation rev...Read more -
Why Power NTC Thermistors Are Essential for Inrush Current Limiting in SMPS
Excessive inrush current is a common challenge in switching power supplies. During startup, a typical 300W SMPS may experience surge currents of 50A Excessive inrush current is a common challenge in switching power supplies. During startup, a typical 300W SMPS may experience surge currents of 50A...Read more -
How Ceramic Capacitors Improve PV Inverter Reliability
In high-voltage applications such as PV inverters, energy storage PCS, and industrial power equipment, reducing component costs is important—but preventing field failures is even more critical. Common Challenges in High-Voltage Applications 1. Insufficient Voltage Margin Frequent surge eve...Read more -
Why High-Voltage Ceramic Capacitor Selection Matters
During the development of power electronics and industrial control systems, engineers often encounter two common problems: High-frequency EMI emissions that fail EMC tests Insulation breakdown during high-temperature and humidity aging tests In many cases, the root cause is not the circu...Read more -
Why Use Power NTC Thermistors for Inrush Current Limiting
Excessive inrush current is a common challenge in switching power supplies. During startup, a typical 300W SMPS can experience surge currents of 50A–100A, which may damage rectifier bridges, weld relay contacts, or shorten system life. Traditional fixed resistors dissipate power continuous...Read more -
Case Study: Solving Resistor Sulfurization Failures in Telecom Power Modules
A telecom equipment manufacturer located in a coastal area encountered an unexpected reliability issue in its base station power modules. Several 0603 chip resistors showed a significant increase in contact resistance, causing intermittent circuit failures and reduced system stability. JEC...Read more -
How to Troubleshoot Safety Capacitor Failures in Power Supply
Safety capacitors are widely used in switching power supplies, industrial equipment, home appliances, and renewable energy systems to suppress EMI and ensure electrical safety. Over time, electrical stress, temperature, and environmental factors may affect capacitor performance. Here are t...Read more