Capacitor Solution for Industrial Variable Frequency Drives (VFDs)

1. Solution Introduction

Variable Frequency Drives (VFDs) are the workhorses of industrial automation, but they operate in electrically and thermally stressful environments. The DC Bus capacitors within a VFD are arguably the most critical components for reliability. They must absorb and deliver enormous ripple currents generated during motor operation. This solution utilizes Jianghai's most robust capacitors to build a VFD front-end that is built to last.

2. Solution Block Diagram

3. Core Advantages of this Solution

• Maximum Ripple Current Handling: Employs large can screw terminal electrolytic capacitors designed specifically for the high RMS currents found in VFD DC link applications.
• High Reliability: The components selected feature high vibration resistance and are designed for long life at elevated operating temperatures typical of an industrial control cabinet.
• Switch Protection: Includes high dV/dt snubber film capacitors placed directly across the IGBT modules to suppress destructive voltage spikes during switching events.
• Complete Solution: Covers all key capacitor needs from the main DC bus to the auxiliary power and control logic, all from a single trusted manufacturer.

4. Recommended Bill of Materials (BOM)

Function	Recommended Series	Key Benefits	Link
Main DC Bus Filtering	Jianghai CD 130 / CD 138	Extremely high ripple current, high capacitance, screw terminals	View CD130
IGBT Snubber Circuit	Jianghai CBB 161 / CBB 162	High dV/dt, low ESL, protects power switches	Consult FAE
Control Board Power	Jianghai CD 295	105°C, high reliability for control logic supply	View CD295

Note: VFD design is complex. The exact capacitance and voltage ratings depend heavily on motor power and bus voltage. We strongly recommend consulting our FAEs for a tailored solution.