TI公司的bq500412是無線充電聯盟(WPC)標準WPC 1.1 Qi兼容的無線充電發送器,集成了控制無線充電的所有功能,設計用于12V充電系統或5V充電系統,可以對智能手機等進行智能充電.本文介紹了bq500412主要特性,框圖, 系統框圖以及bq500412EVM-584 評估模塊主要特性和性能指標,電路圖,材料清單和PCB元件布局圖.

The bq500412 is a Qi-certified value solution that integrates all functions required to control wireless power delivery to a single WPC1.1 compliant receiver. It is WPC1.1 compliant and designed for 12-V systems, or 5-V systems with an optional boost converter, as a wireless power consortium type A6 free positioning transmitter.

The bq500412 the surrounding environment for WPC compliant devices to be powered, safely engages the device, receives packet communication from the powered device and manages the power transfer according to WPC1.1 specification. To maximize flexibility in wireless power control applications, Dynamic Power Limiting (DPL) is featured on the bq500412 when used with an optional boost converter from a 5-V input. Dynamic Power Limiting enhances user experience by seamlessly optimizing the usage of power available from limited input supplies.

The bq500412 supports both Foreign Object Detection (FOD) and enhanced Parasitic Metal Object Detection (PMOD) for legacy product by continuously monitoring the efficiency of the established power transfer, protecting from power lost due to metal objects misplaced in the wireless power transfer field. Should an abnormal operating condition develop during power transfer, the bq500412 handles it and provides indicator outputs. Comprehensive status and fault monitoring features enable a low cost yet robust, Qi-certified wireless power system design.

The bq500412 is available in a 48-pin, 7-mm x 7-mm QFN package.

bq500412主要特性:

Proven, Qi-Certified WPC1.1 Solution for Transmit-Side Application (suitable for 1, 2 or 3 coil configurations)
Lowest Device Count for Full WPC1.1 12-V A6 Solution (single driver stage for all coils)
New Standby Scheme Reduces Standby and Sleep Power Without Need for Extra Supervisor Circuit
Improved FOD Calibration Scheme Simplifies Certification and Increases Accuracy at Higher Power (customer configurable)
Dynamic Power Limiting™ for USB and Limited Power Source Operation When Used With 5-V Input
Digital Demodulation Removes Need for External Filter Circuitry
10 Configurable LED modes Indicate Charging State and Fault Status

bq500412應用:

• Wireless Power Consortium (WPC1.1) Compliant Wireless Chargers For:
– Qi-Certified Smart Phones and Other Handhelds
– Car and Other Vehicle Accessories


圖1. bq500412框圖

圖2. bq500412系統框圖

bq500412 bqTESLA無線電源 TX EVM

The bqTESLA™ wireless power transmitter evaluation module from Texas Instruments is a highperformance, easy-to-use development module for the design of wireless power solutions. The bq500412 EVM evaluation module (EVM) provides all the basic functions of a Qi-compliant three coil, A6 type, wireless charger pad. The EVM is intended to be used with bq51013BEVM-764 or any other Qi-compliant receiver. Both the WPC 1.0 and WPC 1.1 receivers are supported with this design. The bq500412EVM-584 is a 12-V input design with an optional boost convert for operation from 5-V input.

The bq500412EVM-584 evaluation module demonstrates the transmitter portion of the bqTESLA™ wireless power system. This transmitter EVM is a complete transmitter-side solution that powers a bqTESLA™ receiver. The EVM requires only input power for operation, 12 V at 1 A or 5 V at 2.5 A. All transmitter-side electronics and transmitter coils are on a single 4-layer printed-circuit board (PCB). The open design allows easy access to key points of the electrical schematic.

圖3.bq500412EVM-584無線電源發送管理評估模塊外形圖
Free Positioning, Qi-Compliant Wireless Power Transmitter Manager Evaluation Module
bq500412EVM-584 評估模塊性能指標:


bq500412EVM-584 評估模塊主特性:

• WPC A6-Type transmitter coil, 70 mm × 25 mm free positioning area
• Input voltage 12 V or 5 V, using optional boost converter
• WPC 1.1 Foreign Object Detection (FOD) and WPC 1.0 Parasitic Metal Object Detection (PMOD)
• Dynamic Power Limiting™ (DPL) allows operation from a 5-V supply with limited current capability (for example, a USB port)
• Reduced parts count from the legacy bq500410A design
• Compact power section design using the CSD97374 NexFET power stage
• LED indicates power transfer or power fault state


圖4. bq500412EVM-584 評估模塊電路圖
bq500412EVM-584 評估模塊材料清單:




圖5. bq500412EVM-584 評估模塊PCB元件布局圖:頂層