Learn how Wenzhou Shenghuabo improved ISO 7637-2 compliance and EMI suppression using Jaron’s JRT integrated protection components for seat and tailgate motor systems.
Wenzhou Shenghuabo, a well-established Tier-1 supplier of automotive motor systems, manufactures seat, window, and tailgate drive modules for multiple OEMs.
Across 12V, 24V, and 48V platforms, their motor control modules face major challenges from surge voltages, commutation spikes, and conducted EMI noise.
Early validation exposed three major issues:
1. Load dump failures under ISO 7637-2 testing;
2. Excessive commutation noise causing CISPR 25 violations;
3. Poor consistency between control boards using discrete RC + TVS networks.
Jaron proposed an integrated EMC protection network using JRT26B225MXG and JRT26B105MXG devices.
This design replaced the traditional RC and TVS configuration with two compact, hybrid protection nodes.
|
Location |
Protective devices |
Function Description |
|
Motor end (Brush) |
JRT26B105MXG |
Suppressing high-frequency commutation noise and peak clipping clamping |
The dual-node configuration maintains stable suppression across different operating voltages and temperatures.
Validation was conducted under ISO 7637-2 and CISPR 25, covering surge, spike, conducted, and radiated EMC tests.
|
Test Project |
Original solution (RC+TVS) |
Integrated Solution (JRT Series) |
Improvement range |
|
Load Dump residual pressure |
105V |
68V |
↓35% |
|
EMI peak (30MHz) |
−28 dBµV |
−44 dBµV |
↓16 dB |
|
Verification cycle |
4 weeks |
1.5 weeks |
↓62% |
|
Consistency deviation |
±10% |
±2.5% |
Stable improvement |
The JRT solution achieved strong surge absorption and 16dB EMI reduction, with excellent thermal stability and no degradation after 50 load dump cycles.
Thermal and humidity tests confirmed ±5% clamping stability between −40°C and +125°C, and less than 3% capacitance variation after 500 hours in high-humidity conditions.
This makes the JRT series ideal for harsh automotive conditions—cold-start surges, stall currents, and continuous load operations.
According to Shenghuabo engineers:
“Validation time was reduced by two-thirds, and the EMC pass rate improved significantly with more consistent production results.”
After mass production, the EMC pass rate improved from 81% to 98%, PCB area decreased by 45%, and per-unit module cost dropped by around USD 0.15.
|
Index |
Improvement effect |
|
Number of devices |
Reduce by 3 |
|
Cost |
Reduced by approximately 40% |
|
Test efficiency |
Increased by 67% |
|
Consistency |
Increase by 75% |
|
Environmental adaptability |
Durability tested at -40 to 125°C |
The JRT series delivers a scalable, cost-efficient, and reliable EMC solution for automotive motor applications, combining simplicity with proven performance.
As vehicles evolve toward higher power and smarter systems, integrated EMC protection will dominate the market.
JRT devices are ready for next-generation 48V platforms, BCMs, and intelligent motor control units.
The Shenghuabo case demonstrates the dual engineering and economic advantages of Jaron’s JRT series.
It simplifies EMC design, improves product stability, and enables faster, more consistent mass production.
Seat Motor EMC | Tailgate Motor Surge Protection | JRT Series | Automotive EMC | ISO 7637-2
EN
