## Overview of WCT-514-R/Q The **WCT-514-R/Q** is a high-performance, single-coil wireless charging transmitter module. It is designed based on the **Qi Standard** (WPC - Wireless Power Consortium) to provide efficient power transfer to mobile devices, wearables, and other compatible electronics. --- ### Core Electronic Components The module consists of several critical subsystems that manage power conversion, communication, and safety. | Component Type | Function | Description | | :--- | :--- | :--- | | **Main Controller (MCU)** | Logic & Protocol | Manages the Qi handshake, PID control for power delivery, and safety monitoring. | | **Power Bridge (Inverter)** | DC to AC Conversion | Usually a Full-Bridge or Half-Bridge MOSFET configuration that converts DC input into a high-frequency AC signal. | | **Resonant Capacitor** | Tank Circuit | High-quality C0G/NPO capacitors used to create a resonant frequency (typically 110-205kHz) with the primary coil. | | **Inductive Coil** | Energy Transfer | A precision-wound copper coil (Litz wire) that generates the electromagnetic field. | | **Current/Voltage Sense** | Feedback Loop | Shunt resistors and op-amps that monitor power consumption and detect "Foreign Objects" (FOD). | --- ### Technical Specifications The "R/Q" variants typically signify specific hardware revisions or certification levels. Below are the general operational parameters: * **Input Voltage:** 5V DC (Standard) or 9V/12V (Fast Charge versions). * **Output Power:** Up to 15W (depending on the specific sub-model and input source). * **Efficiency:** Typically >75% at full load. * **Frequency Range:** 110kHz to 205kHz. * **Protection Features:** 1. **FOD (Foreign Object Detection):** Detects metal objects between the coil and phone to prevent overheating. 2. **OTP (Over Temperature Protection):** Thermal shutdown if the module gets too hot. 3. **OVP/OCP:** Over-voltage and over-current protection. --- ### Operating Principle The electronic operation follows these four primary stages: 1. **Ping Phase:** The controller sends a digital pulse through the coil to "listen" for a compatible receiver (Rx). 2. **Identification & Configuration:** Once a device is detected, the module reads data packets from the Rx to identify power requirements. 3. **Power Transfer:** The MCU adjusts the PWM (Pulse Width Modulation) frequency or duty cycle of the MOSFET bridge to maintain the requested power level. 4. **End of Power:** The module enters standby when the battery is full or the device is removed. --- ### Pinout and Interface (Typical) ```markdown 1. VIN - Positive Power Input 2. GND - Ground 3. LED - Status Indicator Output (Blinking = Charging, Red = Error) 4. BUZ - Optional Buzzer output for acoustic feedback 5. I2C - (Some models) For external MCU communication/monitoring ``` ---