PowerInt BridgeSwitch系列40W三相逆变器参考设计DER－749 |电子通-应用新知，新电子的助推者电子通

powerint公司的BridgeSwitch™系列是集成了设备保护和系统监测的高压自供电的半桥马达驱动器,大大地简化高压逆变器2/3相PM或BLDC马达驱动的开发和生产.全集成半桥级的效率高达98%,额定连续编RMS电流时不需要外接散热器.器件集成了600V N沟功率FREDFET和超软快恢复二极管,提供内部故障保护功能和外部系统级监测,主要用在2相或三相高压PM和BLDC马达驱动,高达300W逆变器输出功率,包括洗碗机和冰箱在内的家用电器,高效空调中的冷凝器风扇.本文介绍了BridgeSwitch™系列产品亮点,功能框图,应用电路以及采用BridgeSwitch马达驱动器BRD1260C和LinkSwitch-TN2LNK3202D的40W三相逆变器参考设计DER-749主要特性和指标,电路图,材料清单和PCB布局图.

The BridgeSwitch™ family of integrated half-bridges dramaticallysimplifies the development and producTIon of high-voltage inverterdriven 2- or 3-phase PM or BLDC motor drives. It incorporates twohigh-voltage N-channel power FREDFETs with low and high-side driversin a single small-outline package. The internal power FREDFETs offer ultra-soft and ultrafast diodes ideally suited for hard switched inverterdrives. Both drivers are self-supplied eliminaTIng the need for anexternal auxiliary power supply. BridgeSwitch provides a uniqueinstantaneous phase current output signal simplifying implementaTIon ofsensor-less control schemes. The low-profile, compact footprint surfacemount package offers extended creepage distances and allows heatsinking of both power FREDFETs through the printed circuit board.

BridgeSwitch offers internal fault protecTIon functions and externalsystem level monitoring. Internal fault protection includes cycle-by-cycle current limit for both FREDFETs and two level thermal overloadprotection. External system level monitoring includes DC bus sensingwith four undervoltage levels and one overvoltage level as well asdriving external sensors such as an NTC. The bi-directional bussedsingle wire status interface reports observed status changes.

BridgeSwitch™系列产品亮点:

Highest Performance and Design Flexibility
• Fully integrated half-bridge stage with up to 98% efficiency
• Eliminates external heat sink at rated continuous RMS current
• 600 V N-channel power FREDFETs
• Ultra-soft, fast recovery diode
• Accurate instantaneous phase current information output (BRD126X)
• Eliminates external sensing and amplification circuitry
• Self-biased low-side and high-side drivers
• Eliminates need for auxiliary power supply
• Small footprint surface mount inSOP-24C package
• Exposed pads enable heat sinking through PCB
• Controlled FREDFET switching speed reduces EMI
Enhanced Safety and Reliability Features
• Adustable cycle-by-cycle current limit for both FREDFETs
• Fail-safe operation
• Internal dual level thermal overload protection
• Self-configuring system level monitoring input
• Four level DC bus undervoltage
• DC bus overvoltage
• System temperature
• Adaptive dead time
• Simultaneous conduction lockout protection
Status Interface
• Bi-directional bussed open Drain single wire interface
• Reports status updates to system MCU
• Successful power-up
• Internal over-current or temperature faults
• System level faults
• Includes device identification
• Status query through system MCU
• Device fault reset through system MCU

BridgeSwitch™系列产品应用:

• 2- or 3-phase high-voltage PM and BLDC motor drives
• Up to 300 W typical inverter output power
• Appliances including dish washers and refrigerators
• Condenser fans in high efficiency air conditioners

图1.BridgeSwitch™系列BRD116x功能框图

图2.BridgeSwitch™系列BRD126x功能框图

图3.典型的三相逆变器电路图(BRD126X)

图4.采用BRD1265C三相逆变器的DER-654电路图

采用BridgeSwitch马达驱动器BRD1260C和LinkSwitch-TN2LNK3202D的40W三相逆变器参考设计DER-749

This document is an engineering report describing a 40 W, >93% efficiency sinusoidal control 3-phase inverter for a high-voltage brushless DC (BLDC) motor drive. The design incorporates a complete inverter stage and a control stage to drive a 3-phase BLDC motor for fan applications.

The inverter stage is implemented using three fully integrated BridgeSwitch (BRD1260C) devices in a small footprint surface mount InSOP-24C package with exposed pads that enable heat sinking through PCB.

The control part uses a hall sensor based sine wave driving scheme control chip from Princeton Technology Corp. (PT2505) in SSOP28 package. Sinusoidal commutation allows electrical audible noise reduction in motor phase commutation. The PT2505 operates at 20 kHz PWM frequency and comes with a BLDC user interface kit that allows parameter settings and one-time programming directly on the inverter board.

This document contains the inverter and motor specifications, schematic, bill of materials, printed circuit board layout, the inverter performance, fault protections, parameter settings and test setup.

参考设计DER-749主要特性:

 BridgeSwitch – High-voltage half-bridge motor driver
 Integrated 600 V FREDFETs with ultra-soft, fast recovery diodes
 Hall sensor based sinusoidal control scheme using Princeton Technology Corp. IC (PT2505)
 +24 V motor control chip aux supply circuit using LinkSwitch-TN2 in buck configuration
 Fully self-biased operation - no auxiliary power supply needed on the BridgeSwitch devices
 Lossless over-current protection using BridgeSwitch instantaneous phase current output
 Integrated high-side and low-side cycle-by-cycle current limit on each BridgeSwitch devices
 Device over-temperature protection
 Fault protection mechanisms (overvoltage and undervoltage protection, over-current protection, system over-temperature and motor lock protection)
 On-board programming interface for parameter setting and one-time programming (OTP)
 Voltage controlled speed input and pulse output signal for speed information
 PCB size customized for a 40 W inverter fan design
 No external heat sink