The **WPT-101-R** is a specific electronic component, commonly categorized as a **Wireless Power Transfer (WPT)** coil or module, often used in low-power charging applications. Below is a breakdown of its electronic characteristics and technical specifications. --- ## 1. Component Overview The WPT-101-R is typically a **Receiver (Rx) Coil** assembly. It serves as the bridge between electromagnetic induction and DC power for the device it is integrated into. | Feature | Description | | :--- | :--- | | **Type** | Wireless Power Receiver Coil | | **Material** | Ferrite sheet with Litz wire winding | | **Standard Compliance** | Often Qi-compatible or custom high-frequency induction | | **Mounting Type** | Surface mount or adhesive backing | --- ## 2. Key Electronic Parameters When analyzing the WPT-101-R, electrical engineers focus on the following core specifications: * **Inductance ($L$):** Usually ranges between **10µH to 25µH**. This determines the resonant frequency when paired with a capacitor. * **DC Resistance (DCR):** Low resistance (typically $< 500m\Omega$) is critical to minimize heat generation and energy loss during transfer. * **Q-Factor (Quality Factor):** A high Q-factor is necessary for efficient power coupling over small air gaps. * **Current Rating:** Typically designed for 1A to 2A of induced current. --- ## 3. Structural Design The part consists of two primary electronic sub-materials: ### A. The Coil (Conductive Path) * Uses **Litz Wire**: Multiple strands of thin wire insulated from each other to reduce the "Skin Effect," allowing high-frequency AC to flow efficiently. * **Winding:** Spiral or circular patterns designed to maximize flux capture. ### B. The Ferrite Shield * The black/grey backing is a **Ferrite Sheet**. * **Function:** It directs the magnetic flux towards the transmitter and shields the internal electronics of the device from EMI (Electromagnetic Interference). --- ## 4. Operational Circuit (Typical Application) The WPT-101-R does not work alone; it is the first stage of a power management circuit: ```mermaid graph LR A[Transmitter Coil] -- Magnetic Flux --> B[WPT-101-R Coil] B --> C[Resonant Capacitor] C --> D[Bridge Rectifier] D --> E[DC-DC Regulator] E --> F[Battery/Load] ``` --- ## 5. Usage Considerations * **Alignment:** Efficiency drops significantly if the center of the WPT-101-R is not aligned with the transmitter coil. * **Thermal Management:** Because wireless charging generates heat through eddy currents, the ferrite sheet also acts as a minor thermal spreader. * **Thickness:** The "R" variant is often designed for ultra-thin applications (e.g., smartwatches, medical sensors).