ブログ

With the rapid growth of wireless charging and portable power banks, ensuring thermal safety has become a critical part of product design. These compact devices often operate in confined spaces where heat dissipation is limited. Without proper temperature control, overheating can lead to reduced charging efficiency, battery degradation, or even safety failures.

NTC thermistors — compact, reliable, and responsive — are widely used in these systems to provide real-time thermal protection. Why temperature control matters in portable charging devices？ Power banks and wireless chargers typically face several thermal challenges:

•  Fast charging generates heat, especially near coils and power ICs.
•  Limited ventilation in compact enclosures restricts heat dissipation.
•  Lithium-ion batteries are sensitive to temperature and require protective monitoring.

Without effective thermal feedback, the system risks:

•  Reduced battery lifespan.
•  Lower power conversion efficiency.
•  Potential overheating or system shutdown.

NTC Thermistors: compact and effective temperature sensors. NTC (Negative Temperature Coefficient) thermistors decrease in resistance as temperature rises. In a typical charging circuit, the thermistor detects heat build-up and signals the control unit to:

•  Reduce charging current to cool the system.
•  Pause or stop charging during abnormal temperature rise.
•  Enable temperature logging for performance diagnostics.

Strategic placement of thermistors near sensitive areas — such as battery cells, power MOSFETs, or coil assemblies — ensures accurate thermal feedback and timely response.

NTC thermistors offer a practical and cost-effective solution for managing temperature in wireless chargers and power banks. Their responsiveness and compact form factor make them ideal for modern charging products where space and reliability are key concerns.

For customized sensor specifications, technical support, or sample requests, please contact  Shiheng Electronics — a trusted partner in thermal sensing solutions.