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[原创] Silabs Si828x系列具系统安全特性的4A IGBT驱动方案

关键词:电源管理 IGBT驱动器 马达驱动 逆变器 开关电源 UPS

时间:2017-06-02 10:58:39       作者:Silabs       来源:中电网

Silabs公司的Si828x系列(Si8285和Si8286)是集成了系统安全性和反馈功能的隔离的大电流(4A)栅极驱动器,支持UL1577的高达5.0kVrms的耐压,主要用在IGBT/MOSFET栅极驱动,工业,HEV和可再生能源逆变器,AC,无刷和DC马达驱动与控制,白色家电中变速马达控制,以及隔离的开关电源和UPS电源.本文介绍了Si828x系列(Si8285和Si8286)主要特性,Si8285/6应用电路图,评估板Si8285/86-EVB主要特性,电路图和材料清单以及PCB设计图.

The Si828x (Si8285 and Si8286) are isolated, high current gate drivers with integrated system safety and feedback function. The devices are ideal for driving power MOSFETs and IGBTs used in a wide variety of inverter and motor control applications. The Si8285 and Si8286 isolated gate drivers utilize Silicon Labs’proprietary silicon isolation technology,supporting up to 5.0 kVrms withstand voltage per UL1577. This technology enableshigher-performance, reduced variation with temperature and age, tighter part-to-partmatching, and superior common-mode rejection compared to other isolated gate drivertechnologies.

The input to the device is a complementary digital input that can be utilized in several configurations. The input side of the isolation also has several control and feedback digital signals. The controller to the device receives information about the driver side powerstate (Si8285) and fault state of the device and recovers the device from fault through anactive-low reset pin.

On the output side, the Si8285 provides separate pull-up and pull-down pins for the gate.The Si8286 has a single pin for both functions. A dedicated DSAT pin detects the desaturationcondition and immediately shuts down the driver in a controlled manner.The Si8285 device also integrates a Miller clamp to facilitate a strong turn-off of the powerswitch.

Si828x系列应用:

• IGBT/ MOSFET gate drives
• Industrial, HEV, and renewable energy inverters
• AC, Brushless, and DC motor controls and drives
• Variable speed motor control in consumer white goods
• Isolated switch mode and UPS power supplies

Si828x系列主要特性:

• 4 A IGBT driver
• System Safety Features
• DESAT detection
• FAULT feedback
• Undervoltage Lock Out (UVLO)
• Soft shutdown on fault condition
• Silicon Labs’ high-performance isolationtechnology
• Industry leading noise immunity
• High speed, low latency and skew
• Best reliability available
• 30 V driver-side supply voltage
• Integrated Miller clamp (Si8285 only)
• Power ready pin (Si8285 only)
• Complementary driver control input
• Si8286 pin-out compatible with HCPL-316J
• Compact package: 16-pin wide-body SOIC
• Industrial temperature range: –40 to 125℃
Safety Regulatory Approvals (Pending)
• UL 1577 recognized
• Up to 5000 VRMS for 1 minute
• CSA component notice 5A approval
• IEC 60950-1 (reinforced insulation)
• VDE certification conformity
• VDE0884 Part 10 (reinforced insulation)
• CQC certification approval
• GB4943.1 (reinforced insulation)

图1.Si828x系列简化通路图

图2.Si8285应用电路图

图3.Si8286应用电路图

图4.带RH和RL的Si8286应用电路图

评估板Si8285/86-EVB

The Si8285_86 evaluation board allows system designers to evaluate the features and specifications of the Si8285 and Si8286 isolated IGBT drivers. Sockets are provided to allow the user to mount an IGBT or representative capacitor directly to the board. Alternately, the board can be wired to an in situ switch through the output screw terminals. Power is applied through screw terminals on both sides, and signals can be applied or monitored through a standard header.

The board includes both the Si8285CD-IS and the Si8286CD-IS. These are both isolated IGBT drivers with different pin configurations. The Si8285 has additional features for monitoring and controlling the switch. The Si8286 is a pin configuration common to optocoupler based IGBT drivers. The board allows testing of these features to highlight the usefulness.


图5.评估板Si8285/86-EVB外形图

评估板Si8285/86-EVB主要特性:

• Discusses hardware overview and setup,including:
• Si8285/86 low voltage side connections.
• Si8285/86 isolated gate driveconnections.
• Offers alternative configurations.
• Demonstrates driver functionality.
• Shows Si8285/86-EVB schematics andsilkscreen/copper layout.
• Includes a bill of materials and orderingguide

图6.评估板Si8285/86-EVB顶级电路图

图7.Si8285电路图

图8.Si8286电路图
评估板Si8285/86-EVB材料清单:


图9.评估板Si8285/86-EVB顶层丝印图

图10.评估板Si8285/86-EVB顶层铜线图

图11.评估板Si8285/86-EVB底层丝印图

图12.评估板Si8285/86-EVB底层铜线图
详情请见:
http://www.silabs.com/documents/public/data-sheets/si8285-86-data-sheet.pdf
http://www.silabs.com/documents/public/user-guides/UG169-Si8285-86-EVB-Guide.pdf
si8285-86-data-sheet.pdf
UG169-Si8285-86-EVB-Guide.pdf

 

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