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| L9907三相BLDC馬達驅動解決方案 |
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| 文章來源：永阜康科技 更新時間：2019/4/16 9:58:00 |
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ST公司的L9907是三相柵極驅動器,采用ST公司的先進的BCD-6s技術,能驅動用于3相BLDC馬達的所有PowerMOS晶體管L9907滿足汽車規范AEC-Q100,電源電壓從4.2V到54V,用于工作在單(12V)系統,雙(24V)系統和48V電池應用,在FET高邊驅動器引腳上能經受住-7 V - 90 V,低待機電流功耗,PWM工作頻率高達20kHz,柵極驅動器電流可通過SPI四步調整,調整范圍通過外接電阻最大柵極控制電流為600mA.此外還有保護和診斷功能:FET驅動器具有電源欠壓(UV)診斷,柵到源輸出電壓限制,柵到源無源開關斷開;電源VB和VCC有過壓(OV),欠壓(UV)診斷和保護功能,所有邏輯引腳能經受35V,超溫診斷和關斷,主要用于3相柵極驅動器和汽車FET驅動器.本文介紹了L9907主要特性,框圖,三相馬達控制圖以及評估板EVAL-L9907應用框圖,主板電路圖和逆變器板電路圖表與PCB設計圖.
L9907 is a smart power device realized in STMicroelectronics advanced BCD-6s technology. It is able to drive all PowerMOS transistors for 3-phase BLDC motor applications. The circuit is suitable to operate in environments with high supply voltage such as double battery. Supply related pins are capable of withstanding up to 90 V. Moreover, the device is able to control the six pre-driver channels independently. In this way it is possible to implement all kinds of electric motor control strategy.
The integrated boost regulator provides sufficient gate charge for all PowerMOS down to a battery voltage of 6 V. All pre-drivers have dedicated connections with the MOSFET sources. The device offers programmability for a base gate output current via an external resistor. Moreover, via SPI, it is possible to select among 4 gate output current levels even while the application is running. All channels are protected against short circuit and the device is protected against overtemperature conditions. Moreover, the boost converter implements an over voltage protection to allow safe functionality of pre-drivers in all battery voltage conditions. During over voltage conditions, BST_C voltage is limited by temporarily switching off the boost regulator and pre-drivers are allowed to operate. Boost will be self re-enabled as soon as the output voltage decreases to an acceptable value.
The device is equipped with 2 current sense amplifiers. Both have SPI selectable amplifier gain (10, 30, 50 and 100) and output offset voltage level in order to allow max flexibility for phase or ground current sense strategy. All I/O pins are 35 V compatible. Full diagnostic is available through SPI. The device is available in TQFP64 and bare die, depending on the application requirements.The device is protected against Shoot Through events.
L9907主要特性:
AEC-Q100 qualified
Supply voltage from 4.2V to 54 V for working in single (12 V systems), double (24 V systems) and 48 V battery applications
The device can withstand -7 V to 90 V at the FET high-side Driver pins
Low standby current consumption
3.3 V internal regulator supplied by Vcc pin
Boost regulator for full Rdson down to 6 V and over voltage protection
3 low-side + 3 high-side drivers
– PWM operation up to 20 kHz
– Gate driver current adjustable via SPI in 4 steps. Range set via external resistor. Maximum gate controlled current 600 mA
– Source connection to each MOSFET
Input pin for each gate driver
2-differential current sense amplifiers:
– Output offset selectable via SPI (0.2*Vcc offset for ground shunt resistors connection, 0.5*Vcc offset for phase shunt resistors connection)
– All the amplifier gain factors are programmable (10, 30, 50, 100)
8 MHz, 16-bit SPI
Full diagnostic
Programmable parameters:
– Cross conduction dead time with a fixed minimum value
– 4 current steps driving the PowerMOS gates (25%, 50%, 75%, 100%)
– Phase or ground selection of current sense amplifier
– Gain values for the current sense amplifiers
– Zero current output voltage (offset) for the current sense amplifiers
– Over voltage threshold selection for single or double battery operation
– Short circuit detection thresholds for the low-side and the high-side MOSFETs (drain to source voltage monitor).
Protection and diagnostic
FET driver:
– FET driver supply Undervoltage (UV) diagnostic;
– Gate to source output voltage limit;
– Gate to source passive switch off.
Power supply pins VB and VCC:
– Overvoltage (OV), Undervoltage (UV) diagnostic and protection
All logic pins withstand 35 V
Power MOSFET drain to source voltage drop measurement for overcurrent protection Over-temperature diagnostic and shutdown
Fault status flag output
圖1.L9907框圖
圖2.MOSFET驅動器電源架構圖
圖3.三相馬達控制圖
評估板EVAL-L9907
The EVAL-L9907 is an evaluation board designed to provide the user a platform for the L9907, a FET driver for 3 phase BLDC motor. The board offers all the main input/output capabilities needed to drive a BLCD motor properly and to provide diagnostic functionalities.
Full diagnostic is available through SPI. By using SPI communication, it is possible to program L9907 while the application is running (e.i. set the gain of the current sense amplifier).
A dedicated pin array allows connecting easily a SPC5 discovery+ board and the EVAL-L9907. In association with the discovery board SPC560P-DISP a dedicated SW allows controlling a motor control application by using a PC via a USB port.
L9907 device is able to control the six pre-driver channels independently and all pre-drivers have dedicated connections with the output MOSFETs; this feature gives the user the possibility to implement all kinds of electric motor control strategy. All gate driver outputs are protected against short circuit and L9907 is protected against over-temperature condition.
Three terminal blocks are dedicated to connect the three wires of a BLDC Motor (3-phases), moreover, specific connectors are present to connect the feedback signals from the motor to the gate driver and to the microcontroller.
The EVAL-L9907 is an evaluation board designed to allow the whole hardware configuration flexibility, giving the user total access to all pins of the L9907.
Standard connectors connect the gate driver board (L9907) and Inverter Power MOSFET output stage; this solution allows simplifying the evaluation procedure and it increases the flexibility of the HW environment.
The main features are: Total accessibility to all device pins (both L9907 and the Inverter MOSFET board).Two separated boards: gate driver with L9007 and Inverter Power MOSFET boards with the MOSFET array. This HW architecture allows the user to evaluate the application with different HW configurations. Output power board current capability up to 20A.Full HW compatibility with the SPC56 discovery boards through the standard SPC56 Discovery+ connector, 0.1” - 4x36 pin.Possibility to connect generic microcontroller boards(a) by using a customized adapter.
圖4.評估板EVAL-L9907應用框圖
圖5.L9907柵極驅動器板-元件和連接器-頂層
圖6.L9907柵極驅動器板-元件和連接器-底層
圖7.L9907輸出電源板外形圖-頂層圖8.L9907輸出電源板外形圖-底層
圖9.L9907輸出電源板-元件和連接器-頂層
圖10.L9907輸出電源板-元件和連接器-底層
圖11.評估板EVAL-L9907主板電路圖(1)
圖12.評估板EVAL-L9907主板電路圖(2)
圖13.評估板EVAL-L9907逆變器板電路圖
圖14.評估板EVAL-L9907主板PCB設計圖(1)
圖15.評估板EVAL-L9907主板PCB設計圖(2)
圖16.評估板EVAL-L9907主板PCB設計圖(3)
圖17.評估板EVAL-L9907主板PCB設計圖(4)
圖18.評估板EVAL-L9907逆變器板PCB設計圖(1)
圖19.評估板EVAL-L9907逆變器板PCB設計圖(2)
圖20.評估板EVAL-L9907逆變器板PCB設計圖(3)
圖21.評估板EVAL-L9907逆變器板PCB設計圖(4)
圖22.評估板EVAL-L9907柵極驅動器板PCB布局圖-頂層
圖23.評估板EVAL-L9907柵極驅動器板PCB布局圖-底層
圖24.評估板EVAL-L9907逆變器板PCB布局圖-頂層
圖25.評估板EVAL-L9907柵極驅動器板PCB布局圖-底層
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