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CN220796290U - Disk drive device - Google Patents

Disk drive device Download PDF

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CN220796290U
CN220796290U CN202322236593.9U CN202322236593U CN220796290U CN 220796290 U CN220796290 U CN 220796290U CN 202322236593 U CN202322236593 U CN 202322236593U CN 220796290 U CN220796290 U CN 220796290U
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circuit
signal
motor
current sampling
mos tube
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王景隆
王瑞晰
王洪海
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Northeastern University China
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Northeastern University China
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Abstract

The utility model relates to a disk drive device, which comprises a motor, a motor and a control unit, wherein the motor is used for driving a disk to rotate; the disk drive apparatus further includes a control circuit for generating a target drive signal for driving the motor to operate, the control circuit including: the MCU circuit is used for generating an initial PWM signal; a gate driving circuit for receiving the initial PWM signal and converting into an intermediate PWM signal; an inverter circuit for receiving the intermediate PWM signal and converting into a target drive signal; the signal output end of the MCU circuit is connected with the signal input end of the grid driving circuit; the signal output end of the grid driving circuit is connected with the signal input end of the inverter circuit through the follow current protection element; the signal output end of the inverter circuit is connected with the motor; the motor is a three-phase direct current brushless motor, and the three-phase direct current brushless motor works based on three groups of target driving signals; the gate driving circuit includes a three-phase gate driving chip. The device can improve the response speed of the magnetic disk and prevent the chip or the element in the control circuit from being burnt.

Description

一种磁盘驱动装置Disk drive device

技术领域Technical Field

本实用新型涉及磁盘驱动技术领域,尤其涉及一种磁盘驱动装置。The utility model relates to the technical field of disk drive, in particular to a disk drive device.

背景技术Background technique

磁盘驱动装置是计算机中常用的存储设备之一,用于存储和读取数据。磁盘驱动装置由磁盘、电机、传动装置、控制电路等部分组成。在磁盘驱动器启动以存储或读取数据时,电机需要快速启动并带动磁盘旋转,以使磁盘对应的扇区位于读写头下方。当电机响应速度较慢而无法快速到达工作速度时,会延长读写等待时间而降低数据传输效率。而且,在磁盘启动时,由于磁盘和读写头之间的接触力很小,因此磁盘启动时易受到外部干扰而损坏。此外,当电机负载较大或磁盘驱动器的工作环境中存在静电时,容易烧毁控制电路中的芯片或元件,影响磁盘驱动器的正常使用。The disk drive is one of the commonly used storage devices in computers, which is used to store and read data. The disk drive consists of a disk, a motor, a transmission device, a control circuit and other parts. When the disk drive is started to store or read data, the motor needs to start quickly and drive the disk to rotate so that the corresponding sector of the disk is located under the read-write head. When the motor responds slowly and cannot reach the working speed quickly, the read-write waiting time will be extended and the data transmission efficiency will be reduced. Moreover, when the disk is started, since the contact force between the disk and the read-write head is very small, the disk is easily damaged by external interference when it is started. In addition, when the motor load is large or there is static electricity in the working environment of the disk drive, it is easy to burn the chips or components in the control circuit, affecting the normal use of the disk drive.

实用新型内容Utility Model Content

(一)要解决的技术问题1. Technical issues to be resolved

鉴于现有技术的上述缺点、不足,本实用新型提供一种磁盘驱动装置,其解决了现有磁盘驱动装置响应速度慢和易损坏的技术问题。In view of the above-mentioned shortcomings and deficiencies of the prior art, the utility model provides a disk drive device, which solves the technical problems of the prior disk drive device being slow in response speed and easy to be damaged.

(二)技术方案(II) Technical solution

为了达到上述目的,本实用新型采用的主要技术方案包括:In order to achieve the above-mentioned purpose, the main technical solutions adopted by the utility model include:

本实用新型实施例提供一种磁盘驱动装置,包括电机,所述电机用于驱动磁盘旋转;所述磁盘驱动装置还包括控制电路,用于生成驱动所述电机工作的目标驱动信号,所述控制电路包括:MCU电路,用于生成初始PWM信号;栅极驱动电路,用于接收所述初始PWM信号并转换成中间PWM信号;逆变器电路,用于接收所述中间PWM信号并转换成目标驱动信号;其中,所述MCU电路的信号输出端与所述栅极驱动电路的信号输入端连接;所述栅极驱动电路的信号输出端通过续流保护元件与所述逆变器电路的信号输入端连接;所述逆变器电路的信号输出端与所述电机连接;所述电机为三相直流无刷电机,所述三相直流无刷电机基于三组目标驱动信号工作;所述栅极驱动电路包括三相栅极驱动芯片;所述三相栅极驱动芯片的信号输入端与MCU电路的信号输出端连接,用于接收MCU电路生成的三组初始PWM信号;所述三相栅极驱动芯片的信号输出端用于向逆变器电路输出三组中间PWM信号。The utility model provides a disk drive device, comprising a motor, which is used to drive the disk to rotate; the disk drive device also includes a control circuit, which is used to generate a target drive signal for driving the motor to work, and the control circuit includes: an MCU circuit, which is used to generate an initial PWM signal; a gate drive circuit, which is used to receive the initial PWM signal and convert it into an intermediate PWM signal; an inverter circuit, which is used to receive the intermediate PWM signal and convert it into a target drive signal; wherein the signal output end of the MCU circuit is connected to the signal input end of the gate drive circuit; the signal output end of the gate drive circuit is connected to the signal input end of the inverter circuit through a freewheeling protection element; the signal output end of the inverter circuit is connected to the motor; the motor is a three-phase DC brushless motor, and the three-phase DC brushless motor works based on three groups of target drive signals; the gate drive circuit includes a three-phase gate drive chip; the signal input end of the three-phase gate drive chip is connected to the signal output end of the MCU circuit, and is used to receive the three groups of initial PWM signals generated by the MCU circuit; the signal output end of the three-phase gate drive chip is used to output three groups of intermediate PWM signals to the inverter circuit.

可选地,所述续流保护元件包括并联的续流保护电阻和续流齐纳二极管;所述续流齐纳二极管的阴极与所述栅极驱动电路的信号输出端连接。Optionally, the freewheeling protection element includes a freewheeling protection resistor and a freewheeling Zener diode connected in parallel; the cathode of the freewheeling Zener diode is connected to the signal output end of the gate drive circuit.

可选地,所述三相栅极驱动芯片的信号输出端包括三组用于输出所述中间PWM信号的第一输出引脚,每组所述第一输出引脚包括:用于输出低侧中间PWM信号的低侧信号引脚和用于输出高侧中间PWM信号的高侧信号引脚;所述逆变器电路包括三路并联的逆变支路,每路所述逆变支路的信号输入端分别与一组第一输出引脚连接,用于接收一组中间PWM信号并转换为一路目标驱动信号;其中,所述逆变支路包括:第一MOS管、第二MOS管、第一RC滤波电路、第二RC滤波电路和用于引出一路目标驱动信号的输出端子;所述第一MOS管的源极与第二MOS管的漏极连接,第二MOS管的源极接地;所述第一RC滤波电路并联于第一MOS管的漏极与源极之间,所述第二RC滤波电路并联于所述第二MOS管的漏极与源极之间;所述第一MOS管与第二MOS管的栅极,分别与所述低侧信号引脚或高侧信号引脚连接;所述输出端子的第一端连接于所述第一MOS管的源极与第二MOS管的漏极之间,所述输出端子的第二端与所述三相直流无刷电机的输入端连接。Optionally, the signal output end of the three-phase gate drive chip includes three groups of first output pins for outputting the intermediate PWM signals, and each group of the first output pins includes: a low-side signal pin for outputting a low-side intermediate PWM signal and a high-side signal pin for outputting a high-side intermediate PWM signal; the inverter circuit includes three parallel inverter branches, and the signal input end of each inverter branch is respectively connected to a group of first output pins, for receiving a group of intermediate PWM signals and converting them into a target drive signal; wherein the inverter branch includes: a first MOS tube, a second MOS tube, a first RC filter circuit, a second RC filter circuit and An output terminal for leading out a target drive signal; the source of the first MOS tube is connected to the drain of the second MOS tube, and the source of the second MOS tube is grounded; the first RC filter circuit is connected in parallel between the drain and the source of the first MOS tube, and the second RC filter circuit is connected in parallel between the drain and the source of the second MOS tube; the gates of the first MOS tube and the second MOS tube are respectively connected to the low-side signal pin or the high-side signal pin; the first end of the output terminal is connected between the source of the first MOS tube and the drain of the second MOS tube, and the second end of the output terminal is connected to the input end of the three-phase DC brushless motor.

可选地,在每路逆变支路中,所述第一MOS管的栅极与所述栅极驱动芯片的高侧信号引脚连接;所述第二MOS管的栅极与所述栅极驱动芯片的低侧信号引脚连接。Optionally, in each inverter branch, the gate of the first MOS tube is connected to the high-side signal pin of the gate driver chip; the gate of the second MOS tube is connected to the low-side signal pin of the gate driver chip.

可选地,在每路逆变支路中,所述输出端子的第二端通过双向齐纳二极管与所述栅极驱动芯片的高侧信号引脚连接,所述三相栅极驱动芯片的低侧信号引脚通过双向齐纳二极管接地,所述双向齐纳二极管的额定关断电压等于所述三相栅极驱动芯片输出的最大电压。Optionally, in each inverter branch, the second end of the output terminal is connected to the high-side signal pin of the gate drive chip through a bidirectional Zener diode, the low-side signal pin of the three-phase gate drive chip is grounded through a bidirectional Zener diode, and the rated turn-off voltage of the bidirectional Zener diode is equal to the maximum voltage output by the three-phase gate drive chip.

可选地,所述控制电路还包括:三路电流采样电路,用于采集并预处理所述三相直流无刷电机的第一电流采样信号;每路所述电流采样电路包括:电机三相线电流采样电阻和第一运算放大电路;所述电机三相线电流采样电阻串联于所述输出端子与所述三相直流无刷电机的输入端之间,且电机三相线电流采样电阻的两端分别与第一运算放大电路的两个用于接收所述第一电流采样信号的输入引脚连接;所述第一运算放大电路用于输出预处理后的第一电流采样信号的引脚与所述MCU电路连接,以使所述MCU电路根据所述预处理后的第一电流采样信号调整其所输出的初始PWM信号。Optionally, the control circuit also includes: three current sampling circuits for collecting and preprocessing the first current sampling signal of the three-phase DC brushless motor; each current sampling circuit includes: a motor three-phase line current sampling resistor and a first operational amplifier circuit; the motor three-phase line current sampling resistor is connected in series between the output terminal and the input end of the three-phase DC brushless motor, and the two ends of the motor three-phase line current sampling resistor are respectively connected to two input pins of the first operational amplifier circuit for receiving the first current sampling signal; the pin of the first operational amplifier circuit for outputting the preprocessed first current sampling signal is connected to the MCU circuit, so that the MCU circuit adjusts the initial PWM signal it outputs according to the preprocessed first current sampling signal.

可选地,所述控制电路还包括电源电路;所述电源电路包括:滤波电路、BUCK降压电路、第一LDO降压电路和第二LDO降压电路;所述滤波电路的输入端通过输入总线与外部电源连接;所述BUCK降压电路的输入端与所述滤波电路的输出端连接;所述第一LDO降压电路的输入端与所述BUCK电路的输出端连接,所述第一LDO降压电路的输出端与所述MCU电路连接以提供稳定电压;所述第二LDO降压电路的输入端与所述BUCK电路的输出端连接,所述第二LDO降压电路的输出端与所述电流采样电路提供参考电压;所述滤波电路的输出端还分别与所述栅极驱动电路、逆变器电路连接以提供驱动电压。Optionally, the control circuit also includes a power supply circuit; the power supply circuit includes: a filter circuit, a BUCK buck circuit, a first LDO buck circuit and a second LDO buck circuit; the input end of the filter circuit is connected to an external power supply through an input bus; the input end of the BUCK buck circuit is connected to the output end of the filter circuit; the input end of the first LDO buck circuit is connected to the output end of the BUCK circuit, and the output end of the first LDO buck circuit is connected to the MCU circuit to provide a stable voltage; the input end of the second LDO buck circuit is connected to the output end of the BUCK circuit, and the output end of the second LDO buck circuit provides a reference voltage to the current sampling circuit; the output end of the filter circuit is also respectively connected to the gate drive circuit and the inverter circuit to provide a drive voltage.

可选地,所述控制电路还包括:总线采样电路,用于采集并预处理所述输入总线的第二电流采样信号;所述总线采样电路包括:总线电流采样电阻和第二运算放大电路;所述总线电流采样电阻串联于所述输入总线之间,且总线电流采样电阻的两端分别与第二运算放大电路的两个用于接收所述第二电流采样信号的输入引脚连接;所述第二运算放大电路用于输出预处理后的第二电流采样信号的引脚与所述MCU电路连接,以使所述MCU电路根据所述预处理后的第二电流采样信号确定是否停止驱动所述电机。Optionally, the control circuit also includes: a bus sampling circuit, used to collect and preprocess the second current sampling signal of the input bus; the bus sampling circuit includes: a bus current sampling resistor and a second operational amplifier circuit; the bus current sampling resistor is connected in series between the input buses, and the two ends of the bus current sampling resistor are respectively connected to two input pins of the second operational amplifier circuit for receiving the second current sampling signal; the pin of the second operational amplifier circuit for outputting the preprocessed second current sampling signal is connected to the MCU circuit, so that the MCU circuit determines whether to stop driving the motor according to the preprocessed second current sampling signal.

可选地,所述控制电路还包括:转子位置反馈电路;所述转子位置反馈电路包括用于采集所述电机的转子位置信息的磁编码器,所述磁编码器与所述MCU电路通信连接,以使MCU电路根据所述转子位置信息调整所述初始PWM信号。Optionally, the control circuit also includes: a rotor position feedback circuit; the rotor position feedback circuit includes a magnetic encoder for collecting rotor position information of the motor, and the magnetic encoder is communicatively connected to the MCU circuit so that the MCU circuit adjusts the initial PWM signal according to the rotor position information.

(三)有益效果(III) Beneficial effects

本实用新型提供的磁盘驱动装置包括电机和控制电路,控制电路通过栅极驱动电路和逆变器电路,对MCU电路生成的初始PWM信号进行处理后,生成用于驱动电机的目标驱动信号。其中,续流保护元件串联于栅极驱动电路的信号输出端和逆变器电路的信号输入端之间,能够防止逆变器电路被过电压或过电流烧毁。此外,三相栅极驱动芯片、逆变器电路能够对初始PWM信号进行快速响应,以此提高了响应速度。The disk drive device provided by the utility model includes a motor and a control circuit. The control circuit processes the initial PWM signal generated by the MCU circuit through the gate drive circuit and the inverter circuit, and generates a target drive signal for driving the motor. Among them, the freewheeling protection element is connected in series between the signal output end of the gate drive circuit and the signal input end of the inverter circuit, which can prevent the inverter circuit from being burned by overvoltage or overcurrent. In addition, the three-phase gate drive chip and the inverter circuit can respond quickly to the initial PWM signal, thereby improving the response speed.

附图说明BRIEF DESCRIPTION OF THE DRAWINGS

图1为实施例中一种磁盘驱动装置的示意图;FIG1 is a schematic diagram of a disk drive device according to an embodiment of the present invention;

图2为实施例中栅极驱动电路的电路原理图;FIG2 is a circuit diagram of a gate drive circuit in an embodiment;

图3为实施例中逆变器电路的电路原理图;FIG3 is a circuit diagram of an inverter circuit in an embodiment;

图4为实施例中一种磁盘驱动装置的示意图;FIG4 is a schematic diagram of a disk drive device according to an embodiment of the present invention;

图5为实施例中电流采样电路和总线采样电路的电路原理图;FIG5 is a circuit schematic diagram of a current sampling circuit and a bus sampling circuit in an embodiment;

图6为实施例中电源电路的电路原理图;FIG6 is a circuit diagram of a power supply circuit in an embodiment;

图7为实施例中MCU电路的电路原理图;FIG7 is a circuit diagram of an MCU circuit in an embodiment;

图8为实施例中转子位置反馈电路的电路原理图。FIG8 is a circuit schematic diagram of a rotor position feedback circuit in an embodiment.

具体实施方式Detailed ways

为了更好的解释本实用新型,以便于理解,下面结合附图,通过具体实施方式,对本实用新型作详细描述。In order to better explain the present invention and facilitate understanding, the present invention is described in detail below through specific implementation modes in conjunction with the accompanying drawings.

为了更好的理解上述技术方案,下面将参照附图更详细地描述本实用新型的示例性实施例。虽然附图中显示了本实用新型的示例性实施例,然而应当理解,可以以各种形式实现本实用新型而不应被这里阐述的实施例所限制。相反,提供这些实施例是为了能够更清楚、透彻地理解本实用新型,并且能够将本实用新型的范围完整的传达给本领域的技术人员。In order to better understand the above technical solution, exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to enable a clearer and more thorough understanding of the present invention and to fully convey the scope of the present invention to those skilled in the art.

实施例Example

如图1所示,本实用新型实施例提供一种磁盘驱动装置,包括用于驱动磁盘旋转的电机,以及用于生成目标驱动信号的控制电路,目标驱动信号用于驱动电机工作;磁盘驱动器可为机械硬盘驱动器;控制电路包括:用于生成初始PWM信号的MCU电路、用于接收初始PWM信号并转换成中间PWM信号的栅极驱动电路和用于接收中间PWM信号并转换成目标驱动信号的逆变器电路。As shown in Figure 1, an embodiment of the utility model provides a disk drive device, including a motor for driving a disk to rotate, and a control circuit for generating a target drive signal, the target drive signal is used to drive the motor to work; the disk drive can be a mechanical hard disk drive; the control circuit includes: an MCU circuit for generating an initial PWM signal, a gate drive circuit for receiving the initial PWM signal and converting it into an intermediate PWM signal, and an inverter circuit for receiving the intermediate PWM signal and converting it into a target drive signal.

MCU电路的信号输出端与栅极驱动电路的信号输入端连接,且栅极驱动电路的信号输出端,通过续流保护元件与逆变器电路的信号输入端连接;逆变器电路的信号输出端与电机连接。The signal output end of the MCU circuit is connected to the signal input end of the gate drive circuit, and the signal output end of the gate drive circuit is connected to the signal input end of the inverter circuit through a freewheeling protection element; the signal output end of the inverter circuit is connected to the motor.

具体地,续流保护元件包括并联的续流保护电阻和续流齐纳二极管,且续流齐纳二极管的阴极与栅极驱动电路的信号输出端连接。Specifically, the freewheeling protection element includes a freewheeling protection resistor and a freewheeling Zener diode connected in parallel, and the cathode of the freewheeling Zener diode is connected to the signal output end of the gate drive circuit.

本实施例中的电机是感性负载,由于电感的电流不能突变,因而在控制电路换流过程中,电感两端容易因为反向电动势产生过电压或过电流而击穿逆变器电路中的MOS管,本实用新型通过设置续流齐纳二极管和续流保护电阻防止MOS管被击穿。其中,续流保护电阻可以用来限制流过MOS管栅极的电流,续流齐纳二极管能够在受到过电压时工作于反向击穿状态,将过电压泄放为稳定的小额压差,从而保护MOS管不会因为过电压和过电流而烧坏。The motor in this embodiment is an inductive load. Since the current of the inductor cannot change suddenly, during the commutation process of the control circuit, the two ends of the inductor are prone to overvoltage or overcurrent due to the reverse electromotive force, which may break down the MOS tube in the inverter circuit. The utility model prevents the MOS tube from being broken down by providing a freewheeling Zener diode and a freewheeling protection resistor. Among them, the freewheeling protection resistor can be used to limit the current flowing through the gate of the MOS tube, and the freewheeling Zener diode can work in a reverse breakdown state when subjected to an overvoltage, discharging the overvoltage into a stable small voltage difference, thereby protecting the MOS tube from being burned out due to overvoltage and overcurrent.

在本实施例的一种较佳的实施方案中,电机为三相直流无刷电机,三相直流无刷电机基于三组目标驱动信号工作。栅极驱动电路为三相栅极驱动芯片,三相栅极驱动芯片的信号输入端与MCU电路的信号输出端连接,用于接收MCU电路生成的三组初始PWM信号;三相栅极驱动芯片的信号输出端用于向逆变器电路输出三组中间PWM信号。三相栅极驱动芯片的信号输出端包括三组用于输出中间PWM信号的第一输出引脚,每组第一输出引脚包括:用于输出低侧中间PWM信号的低侧信号引脚、用于输出高侧中间PWM信号的高侧信号引脚。In a preferred implementation of the present embodiment, the motor is a three-phase DC brushless motor, and the three-phase DC brushless motor works based on three sets of target drive signals. The gate drive circuit is a three-phase gate drive chip, and the signal input end of the three-phase gate drive chip is connected to the signal output end of the MCU circuit, for receiving three sets of initial PWM signals generated by the MCU circuit; the signal output end of the three-phase gate drive chip is used to output three sets of intermediate PWM signals to the inverter circuit. The signal output end of the three-phase gate drive chip includes three groups of first output pins for outputting intermediate PWM signals, and each group of first output pins includes: a low-side signal pin for outputting a low-side intermediate PWM signal, and a high-side signal pin for outputting a high-side intermediate PWM signal.

进一步具体的,如图2所示,三相栅极驱动芯片为FD6288Q芯片,FD6288Q芯片的信号输入端包括LIN1、LIN2、LIN3、HIN1、HIN2、HIN3引脚,用于接收MCU电路生成的三组初始PWM信号,LIN1、LIN2、LIN3、HIN1、HIN2、HIN3引脚分别通过电容接地。FD6288Q芯片的信号输出端包括LO1、LO2、LO3、HO1、HO2、HO3引脚,其中,LO1、LO2、LO3为低侧信号引脚,HO1、HO2、HO3为高侧信号引脚;LO1和HO1、LO2和HO2、LO3和HO3引脚各自组成一组用于输出中间PWM信号的第一输出引脚。More specifically, as shown in FIG2 , the three-phase gate drive chip is a FD6288Q chip, and the signal input end of the FD6288Q chip includes LIN1, LIN2, LIN3, HIN1, HIN2, and HIN3 pins, which are used to receive three groups of initial PWM signals generated by the MCU circuit, and the LIN1, LIN2, LIN3, HIN1, HIN2, and HIN3 pins are grounded through capacitors respectively. The signal output end of the FD6288Q chip includes LO1, LO2, LO3, HO1, HO2, and HO3 pins, wherein LO1, LO2, and LO3 are low-side signal pins, and HO1, HO2, and HO3 are high-side signal pins; LO1 and HO1, LO2 and HO2, and LO3 and HO3 pins each form a group of first output pins for outputting intermediate PWM signals.

如图3所示,逆变器电路包括三路并联的逆变支路,每路逆变支路的信号输入端与一组第一输出引脚连接,用于接收一组中间PWM信号并转换为一路目标驱动信号。As shown in FIG3 , the inverter circuit includes three parallel inverter branches, and the signal input end of each inverter branch is connected to a group of first output pins for receiving a group of intermediate PWM signals and converting them into a target drive signal.

以图3中的一路逆变支路为例,逆变支路包括:第一MOS管Q1、第二MOS管Q2、第一RC滤波电路、第二RC滤波电路和用于引出一路目标驱动信号SHA的输出端子。Taking an inverter branch in FIG. 3 as an example, the inverter branch includes: a first MOS transistor Q1, a second MOS transistor Q2, a first RC filter circuit, a second RC filter circuit and an output terminal for leading out a target drive signal SHA.

第一MOS管Q1的源极与第二MOS管Q2的漏极连接,第二MOS管Q2的源极接地;第一RC滤波电路包括串联的电阻R56和电容C94,第一RC滤波电路并联于第一MOS管Q1的漏极与源极之间;第二RC滤波电路包括串联的电阻R59和电容C105,第二RC滤波电路并联于第二MOS管Q2的漏极与源极之间;第一MOS管Q1与第二MOS管Q2的栅极,分别与一组中间PWM信号对应的低侧信号引脚或高侧信号引脚连接;输出端子的第一端连接于第一MOS管的源极与第二MOS管的漏极之间,输出端子的第二端与三相直流无刷电机的输入端连接。其中,第一RC滤波电路和第二RC滤波电路工作在合适的带宽,以减弱MOS管在开关时的振铃效应,提高电路稳定性。The source of the first MOS tube Q1 is connected to the drain of the second MOS tube Q2, and the source of the second MOS tube Q2 is grounded; the first RC filter circuit includes a resistor R56 and a capacitor C94 connected in series, and the first RC filter circuit is connected in parallel between the drain and source of the first MOS tube Q1; the second RC filter circuit includes a resistor R59 and a capacitor C105 connected in series, and the second RC filter circuit is connected in parallel between the drain and source of the second MOS tube Q2; the gates of the first MOS tube Q1 and the second MOS tube Q2 are respectively connected to a low-side signal pin or a high-side signal pin corresponding to a group of intermediate PWM signals; the first end of the output terminal is connected between the source of the first MOS tube and the drain of the second MOS tube, and the second end of the output terminal is connected to the input end of the three-phase DC brushless motor. The first RC filter circuit and the second RC filter circuit operate at a suitable bandwidth to reduce the ringing effect of the MOS tube when switching and improve the circuit stability.

特别的,续流保护元件对应地分别设置于第一输出引脚与逆变电路之间。在图2中,续流齐纳二极管为D2、D7、D17、D4、D8、D9,续流保护电阻为R13、R17、R21、R16、R18、R19。以D9和R19为例,两者并联后串联于FD6288Q芯片的LO1引脚与逆变器电路中的MOS管Q4之间,以保护MOS管Q4不会因为过电压和过电流而烧毁。In particular, the freewheeling protection elements are respectively arranged between the first output pin and the inverter circuit. In FIG2 , the freewheeling Zener diodes are D2, D7, D17, D4, D8, and D9, and the freewheeling protection resistors are R13, R17, R21, R16, R18, and R19. Taking D9 and R19 as an example, the two are connected in parallel and then connected in series between the LO1 pin of the FD6288Q chip and the MOS tube Q4 in the inverter circuit to protect the MOS tube Q4 from burning due to overvoltage and overcurrent.

具体地,在每路逆变支路中,第一MOS管的栅极与栅极驱动芯片的高侧信号引脚连接;第二MOS管的栅极与栅极驱动芯片的低侧信号引脚连接。Specifically, in each inverter branch, the gate of the first MOS tube is connected to the high-side signal pin of the gate driver chip; the gate of the second MOS tube is connected to the low-side signal pin of the gate driver chip.

较佳地,如图2所示,在每路逆变支路中,输出端子的第二端分别通过双向齐纳二极管D5、D16、D21与栅极驱动芯片的高侧信号引脚连接;三相栅极驱动芯片的低侧信号引脚,通过双向齐纳二极管D18、D19、D20接地,双向齐纳二极管的额定关断电压,等于三相栅极驱动芯片输出的最大电压。双向齐纳二极管能够在其两端的压差大于击穿电压后进入反向击穿状态,使其电流可在很大范围内变化而电压基本不变,从而达到稳压作用,限制栅极驱动电路输出的中间PWM信号的电压,防止逆变支路中的第一MOS管和第二MOS管的栅极被击穿。Preferably, as shown in FIG2 , in each inverter branch, the second end of the output terminal is connected to the high-side signal pin of the gate drive chip through bidirectional Zener diodes D5, D16, and D21 respectively; the low-side signal pin of the three-phase gate drive chip is grounded through bidirectional Zener diodes D18, D19, and D20, and the rated turn-off voltage of the bidirectional Zener diode is equal to the maximum voltage output by the three-phase gate drive chip. The bidirectional Zener diode can enter a reverse breakdown state after the voltage difference between its two ends is greater than the breakdown voltage, so that its current can vary within a wide range while the voltage remains basically unchanged, thereby achieving a voltage stabilization effect, limiting the voltage of the intermediate PWM signal output by the gate drive circuit, and preventing the gates of the first MOS tube and the second MOS tube in the inverter branch from being broken down.

在本实施例的一种较佳的实施方案中,如图4所示,控制电路还包括:用于采集并预处理三相直流无刷电机的第一电流采样信号的三路电流采样电路、总线采样电路、电源电路、转子位置反馈电路。In a preferred implementation of this embodiment, as shown in FIG4 , the control circuit further includes: a three-way current sampling circuit for collecting and preprocessing the first current sampling signal of the three-phase DC brushless motor, a bus sampling circuit, a power supply circuit, and a rotor position feedback circuit.

如图5所示,每路电流采样电路包括:电机三相线电流采样电阻和第一运算放大电路。具体地,第一运算放大电路为INA240芯片。As shown in Fig. 5, each current sampling circuit includes: a motor three-phase line current sampling resistor and a first operational amplifier circuit. Specifically, the first operational amplifier circuit is an INA240 chip.

电机三相线电流采样电阻R42、R44、R45为高精度采样电阻,分别串联于每个输出端子与三相直流无刷电机的输入端之间,且电机三相线电流采样电阻的两端分别与INA240芯片的两个用于接收第一电流采样信号的输入引脚IN+和IN-连接;INA240芯片用于输出预处理后的第一电流采样信号SOA的引脚OUT与MCU电路连接,以使MCU电路根据预处理后的第一电流采样信号调整其所输出的初始PWM信号。The motor three-phase line current sampling resistors R42, R44, and R45 are high-precision sampling resistors, which are respectively connected in series between each output terminal and the input end of the three-phase DC brushless motor, and the two ends of the motor three-phase line current sampling resistors are respectively connected to the two input pins IN+ and IN- of the INA240 chip for receiving the first current sampling signal; the pin OUT of the INA240 chip for outputting the preprocessed first current sampling signal SOA is connected to the MCU circuit, so that the MCU circuit adjusts the initial PWM signal it outputs according to the preprocessed first current sampling signal.

INA240的增益带宽积(GBW)为2MHz,这意味着这款芯片的响应速度很快,能够处理高达数百khz的信号,从而进一步保证控制电路的响应速度和精度。The gain bandwidth product (GBW) of INA240 is 2MHz, which means that this chip has a fast response speed and can handle signals up to hundreds of kHz, thus further ensuring the response speed and accuracy of the control circuit.

如图6所示,电源电路包括:滤波电路、BUCK降压电路、第一LDO降压电路和第二LDO降压电路;As shown in FIG6 , the power supply circuit includes: a filter circuit, a BUCK step-down circuit, a first LDO step-down circuit and a second LDO step-down circuit;

滤波电路的输入端通过输入总线与外部电源连接。具体地,滤波电路可为π型滤波器(图中未示出),包括多个并联的电容,用于对输入总线输入的电流滤波,防止因电压尖峰扰动影响MCU电路供电电流的稳定性。The input end of the filter circuit is connected to the external power supply through the input bus. Specifically, the filter circuit can be a π-type filter (not shown in the figure), including a plurality of capacitors connected in parallel, which is used to filter the current input by the input bus to prevent the stability of the MCU circuit power supply current from being affected by voltage spike disturbances.

BUCK降压电路的输入端与滤波电路的输出端连接。BUCK电路包括ME3116芯片,ME3116芯片的IN引脚与滤波电路的输出端连接,ME3116芯片的SW引脚用于向下一级的第一LDO降压电路、第二LDO降压电路输出5V稳定电压。The input end of the BUCK buck circuit is connected to the output end of the filter circuit. The BUCK circuit includes a ME3116 chip, the IN pin of the ME3116 chip is connected to the output end of the filter circuit, and the SW pin of the ME3116 chip is used to output a 5V stable voltage to the first LDO buck circuit and the second LDO buck circuit of the next level.

第一LDO降压电路的输入端与BUCK电路的输出端连接,第一LDO降压电路的输出端与MCU电路连接以提供稳定电压。具体地,第一LDO降压电路包括SPX3819芯片,SPX3819芯片的VIN引脚接收ME3116芯片输出的5V稳定电压,并转换成3V3稳定电压后输送给MCU电路。The input end of the first LDO buck circuit is connected to the output end of the BUCK circuit, and the output end of the first LDO buck circuit is connected to the MCU circuit to provide a stable voltage. Specifically, the first LDO buck circuit includes an SPX3819 chip, and the VIN pin of the SPX3819 chip receives the 5V stable voltage output by the ME3116 chip, and converts it into a 3V3 stable voltage and then transmits it to the MCU circuit.

第二LDO降压电路的输入端与BUCK电路的输出端连接,第二LDO降压电路的输出端与电流采样电路提供参考电压。具体地,第二LDO降压电路包括ADP151芯片,ADP151芯片的VIN引脚接收ME3116芯片输出的5V稳定电压,并转换成3V3参考电压后输送给电流采样电路和总线采样电路。The input end of the second LDO buck circuit is connected to the output end of the BUCK circuit, and the output end of the second LDO buck circuit provides a reference voltage to the current sampling circuit. Specifically, the second LDO buck circuit includes an ADP151 chip, and the VIN pin of the ADP151 chip receives the 5V stable voltage output by the ME3116 chip, and converts it into a 3V3 reference voltage and then transmits it to the current sampling circuit and the bus sampling circuit.

滤波电路的输出端还分别与栅极驱动电路、逆变器电路连接以提供稳定的驱动电压。The output end of the filter circuit is also connected to the gate drive circuit and the inverter circuit respectively to provide a stable drive voltage.

如图5所示,总线采样电路用于采集并预处理输入总线的第二电流采样信号。总线采样电路包括:总线电流采样电阻和第二运算放大电路。As shown in Fig. 5, the bus sampling circuit is used to collect and pre-process the second current sampling signal of the input bus. The bus sampling circuit includes: a bus current sampling resistor and a second operational amplifier circuit.

总线电流采样电阻R10为高精度采样电阻,串联于输入总线之间,且总线电流采样电阻的两端分别与第二运算放大电路的两个用于接收第二电流采样信号的输入引脚连接;第二运算放大电路用于输出预处理后的第二电流采样信号的引脚与MCU电路连接,以使MCU电路根据预处理后的第二电流采样信号确定是否停止驱动电机,从而达到过流保护的目的,进一步防止控制电路中出现过电流而使芯片或元件损坏。The bus current sampling resistor R10 is a high-precision sampling resistor, which is connected in series between the input buses, and the two ends of the bus current sampling resistor are respectively connected to the two input pins of the second operational amplifier circuit for receiving the second current sampling signal; the pin of the second operational amplifier circuit for outputting the preprocessed second current sampling signal is connected to the MCU circuit, so that the MCU circuit determines whether to stop driving the motor according to the preprocessed second current sampling signal, thereby achieving the purpose of overcurrent protection and further preventing overcurrent from occurring in the control circuit and damaging the chip or components.

转子位置反馈电路包括用于采集电机的转子位置信息的磁编码器,磁编码器与MCU电路通信连接,以使MCU电路根据转子位置信息调整初始PWM信号。具体地,如图8所示,磁编码器的型号为AS5147P14,AS5147P14的输出端口(CSn、CLK、MISO、MOSI)设置为可插拔的排针座J1,通过信号线与MCU电路的SPI接口通信以提供转子位置信息。AS5147P14是一个高分辨率的旋转位置传感器,它配备了集成动态角度误差补偿功能,延迟几乎为0,最大数据更新速率为28kHz,这意味着它可以在每秒内提供多达28000次的位置更新,从而更进一步地保证对电机的控制精度和响应速度。The rotor position feedback circuit includes a magnetic encoder for collecting the rotor position information of the motor, and the magnetic encoder is connected to the MCU circuit in communication so that the MCU circuit adjusts the initial PWM signal according to the rotor position information. Specifically, as shown in FIG8 , the model of the magnetic encoder is AS5147P14, and the output port (CSn, CLK, MISO, MOSI) of the AS5147P14 is set to a pluggable pin header J1, which communicates with the SPI interface of the MCU circuit through a signal line to provide rotor position information. The AS5147P14 is a high-resolution rotary position sensor, which is equipped with an integrated dynamic angle error compensation function, with almost zero delay and a maximum data update rate of 28kHz, which means that it can provide up to 28,000 position updates per second, thereby further ensuring the control accuracy and response speed of the motor.

需要说明的,本实施例中的MCU电路可使用本领域的现有技术,如图6所示,MCU电路包括STM32F446RET6芯片,该MCU电路通过6个I/O端口引出三组初始PWM信号输出给栅极驱动电路,在图6中,上述6个I/O端口对应的引脚为PC6、PC7、PC8、PA7、PB14、PB15。此外,MCU电路通过一个SPI接口(对应的引脚为PB3、PB4、PB5、PD2)与电机位置传感器磁编码器进行通信,一个USART串口(对应的引脚为PA9、PA10)供调试时使用,一个SWD烧录程序接口,MCU电路通过引脚PC1、PC2、PC3接收到第一电流采样信号,通过引脚PA4接收第二电流采样信号,并根据第一电流采样信号和第二电流采样信号调整输出的初始PWM信号。It should be noted that the MCU circuit in this embodiment can use the existing technology in the art. As shown in Figure 6, the MCU circuit includes an STM32F446RET6 chip. The MCU circuit leads to three groups of initial PWM signals through 6 I/O ports and outputs them to the gate drive circuit. In Figure 6, the pins corresponding to the above 6 I/O ports are PC6, PC7, PC8, PA7, PB14, and PB15. In addition, the MCU circuit communicates with the motor position sensor magnetic encoder through an SPI interface (corresponding pins are PB3, PB4, PB5, and PD2), a USART serial port (corresponding pins are PA9 and PA10) for debugging, and a SWD burning program interface. The MCU circuit receives the first current sampling signal through pins PC1, PC2, and PC3, receives the second current sampling signal through pin PA4, and adjusts the output initial PWM signal according to the first current sampling signal and the second current sampling signal.

本实施例中的MCU电路、栅极驱动电路、逆变器电路、电流采样电路、总线采样电路和电源电路均是实体的结构组件。其中,STM32F446RET6芯片中集成有现有的已知的程序,本实施例不涉及任何计算机程序的改进和使用,仅仅提供的是MCU电路、栅极驱动电路、逆变器电路、电流采样电路、总线采样电路和电源电路中元件的连接关系,以及电路间的连接关系。The MCU circuit, gate drive circuit, inverter circuit, current sampling circuit, bus sampling circuit and power supply circuit in this embodiment are all physical structural components. Among them, the STM32F446RET6 chip is integrated with existing known programs. This embodiment does not involve the improvement and use of any computer program. It only provides the connection relationship between the components in the MCU circuit, gate drive circuit, inverter circuit, current sampling circuit, bus sampling circuit and power supply circuit, as well as the connection relationship between the circuits.

此外,MCU电路还包括用于使STM32F446RET6芯片正常工作基本外围电路,例如连接于PH0和PH1引脚的晶振电路等,均采用现有技术实现。In addition, the MCU circuit also includes basic peripheral circuits for enabling the STM32F446RET6 chip to work normally, such as a crystal oscillator circuit connected to the PH0 and PH1 pins, etc., all of which are implemented using existing technologies.

本实用新型提出的磁盘驱动装置,通过上述高速响应的三相栅极驱动芯片FD6288Q、运算放大器芯片INA240、磁编码器芯片AS5147P14的结合,能够使得控制电路实时采集电机的工作状态,以对其非正常的工作状态及时响应,从而保证电机具有较强的抗干扰能力而稳定运行,从而避免磁盘受外界干扰而损坏。此外,上述高速响应的芯片也能够使电机快速启动并达到工作速度,从而减少读写等待时间,提升数据传输效率,从而提高磁盘驱动器的综合性能。The disk drive device proposed by the utility model, through the combination of the three-phase gate drive chip FD6288Q with high-speed response, the operational amplifier chip INA240, and the magnetic encoder chip AS5147P14, can enable the control circuit to collect the working state of the motor in real time, so as to respond to its abnormal working state in time, thereby ensuring that the motor has strong anti-interference ability and stable operation, thereby preventing the disk from being damaged by external interference. In addition, the high-speed response chip can also enable the motor to start quickly and reach the working speed, thereby reducing the read and write waiting time, improving the data transmission efficiency, and thus improving the comprehensive performance of the disk drive.

在本实用新型的描述中,需要理解的是,术语“第一”、“第二”仅用于描述目的,而不能理解为指示或暗示相对重要性或者隐含指明所指示的技术特征的数量。由此,限定有“第一”、“第二”的特征可以明示或者隐含地包括一个或者更多个该特征。在本实用新型的描述中,“多个”的含义是两个或两个以上,除非另有明确具体的限定。In the description of the present invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "plurality" means two or more, unless otherwise clearly and specifically defined.

在本实用新型中,除非另有明确的规定和限定,术语“安装”、“相连”、“连接”、“固定”等术语应做广义理解,例如,可以是固定连接,也可以是可拆卸连接,或成一体;可以是机械连接,也可以是电连接;可以是直接相连,也可以通过中间媒介间接相连;可以是两个元件内部的连通或两个元件的相互作用关系。对于本领域的普通技术人员而言,可以根据具体情况理解上述术语在本实用新型中的具体含义。In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

在本实用新型中,除非另有明确的规定和限定,第一特征在第二特征“上”或“下”,可以是第一和第二特征直接接触,或第一和第二特征通过中间媒介间接接触。而且,第一特征在第二特征“之上”、“上方”和“上面”,可以是第一特征在第二特征正上方或斜上方,或仅仅表示第一特征水平高度高于第二特征。第一特征在第二特征“之下”、“下方”和“下面”,可以是第一特征在第二特征正下方或斜下方,或仅仅表示第一特征水平高度低于第二特征。In the present utility model, unless otherwise clearly specified and limited, when a first feature is “on” or “below” a second feature, it may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, when a first feature is “above”, “above” or “above” a second feature, it may be that the first feature is directly above or obliquely above the second feature, or it may simply mean that the first feature is higher in level than the second feature. When a first feature is “below”, “below” or “below” a second feature, it may be that the first feature is directly below or obliquely below the second feature, or it may simply mean that the first feature is lower in level than the second feature.

在本说明书的描述中,术语“一个实施例”、“一些实施例”、“实施例”、“示例”、“具体示例”或“一些示例”等的描述,是指结合该实施例或示例描述的具体特征、结构、材料或者特点包含于本实用新型的至少一个实施例或示例中。在本说明书中,对上述术语的示意性表述不必须针对的是相同的实施例或示例。而且,描述的具体特征、结构、材料或者特点可以在任一个或多个实施例或示例中以合适的方式结合。此外,在不相互矛盾的情况下,本领域的技术人员可以将本说明书中描述的不同实施例或示例以及不同实施例或示例的特征进行结合和组合。In the description of this specification, the description of the terms "one embodiment", "some embodiments", "embodiment", "example", "specific example" or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, unless they are contradictory.

尽管上面已经示出和描述了本实用新型的实施例,可以理解的是,上述实施例是示例性的,不能理解为对本实用新型的限制,本领域的普通技术人员在本实用新型的范围内可以对上述实施例进行改动、修改、替换和变型。Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are illustrative and cannot be understood as limitations of the present invention. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims (9)

1. A disk drive apparatus comprising a motor for driving a disk to rotate; the magnetic disk drive device is characterized by further comprising a control circuit for generating a target drive signal for driving the motor to work, wherein the control circuit comprises:
the MCU circuit is used for generating an initial PWM signal;
a gate driving circuit for receiving the initial PWM signal and converting into an intermediate PWM signal;
an inverter circuit for receiving the intermediate PWM signal and converting into a target drive signal;
the signal output end of the MCU circuit is connected with the signal input end of the grid driving circuit; the signal output end of the grid driving circuit is connected with the signal input end of the inverter circuit through a follow current protection element; the signal output end of the inverter circuit is connected with the motor;
the motor is a three-phase direct current brushless motor, and the three-phase direct current brushless motor works based on three groups of target driving signals;
the grid driving circuit comprises a three-phase grid driving chip;
the signal input end of the three-phase grid driving chip is connected with the signal output end of the MCU circuit and is used for receiving three groups of initial PWM signals generated by the MCU circuit; the signal output end of the three-phase grid electrode driving chip is used for outputting three groups of intermediate PWM signals to the inverter circuit.
2. The disk drive device according to claim 1, wherein the freewheel protection element includes a freewheel protection resistor and a freewheel zener diode connected in parallel;
and the cathode of the follow current zener diode is connected with the signal output end of the grid driving circuit.
3. The disk drive device of claim 1, wherein the signal output terminals of the three-phase gate drive chip include three sets of first output pins for outputting the intermediate PWM signal, each set of first output pins including: a low-side signal pin for outputting a low-side intermediate PWM signal and a high-side signal pin for outputting a high-side intermediate PWM signal;
the inverter circuit comprises three parallel inversion branches, and the signal input end of each inversion branch is respectively connected with a group of first output pins and is used for receiving a group of intermediate PWM signals and converting the intermediate PWM signals into a target driving signal;
wherein, the contravariant branch road includes: the device comprises a first MOS tube, a second MOS tube, a first RC filter circuit, a second RC filter circuit and an output terminal for leading out one path of target driving signal;
the source electrode of the first MOS tube is connected with the drain electrode of the second MOS tube, and the source electrode of the second MOS tube is grounded;
the first RC filter circuit is connected in parallel between the drain electrode and the source electrode of the first MOS tube, and the second RC filter circuit is connected in parallel between the drain electrode and the source electrode of the second MOS tube;
the grid electrodes of the first MOS tube and the second MOS tube are respectively connected with the low-side signal pin or the high-side signal pin;
the first end of the output terminal is connected between the source electrode of the first MOS tube and the drain electrode of the second MOS tube, and the second end of the output terminal is connected with the input end of the three-phase DC brushless motor.
4. The disc drive apparatus of claim 3 wherein in each inversion branch, the gate of the first MOS transistor is connected to a high-side signal pin of the gate drive chip; and the grid electrode of the second MOS tube is connected with the low-side signal pin of the grid electrode driving chip.
5. The disk drive device of claim 4 wherein in each inverting branch, the second end of the output terminal is connected to the high-side signal pin of the gate driver chip through a bi-directional zener diode, the low-side signal pin of the three-phase gate driver chip is grounded through a bi-directional zener diode, and the rated turn-off voltage of the bi-directional zener diode is equal to the maximum voltage output by the three-phase gate driver chip.
6. The disk drive apparatus according to claim 3, wherein the control circuit further comprises: the three-way current sampling circuit is used for collecting and preprocessing a first current sampling signal of the three-phase direct current brushless motor;
each path of current sampling circuit comprises: the motor three-phase line current sampling resistor and the first operational amplifier circuit;
the motor three-phase line current sampling resistor is connected in series between the output terminal and the input end of the three-phase direct current brushless motor, and two ends of the motor three-phase line current sampling resistor are respectively connected with two input pins of a first operational amplifier circuit, which are used for receiving the first current sampling signals;
the pin of the first operational amplifier circuit for outputting the preprocessed first current sampling signal is connected with the MCU circuit, so that the MCU circuit adjusts the initial PWM signal output by the MCU circuit according to the preprocessed first current sampling signal.
7. The disk drive apparatus according to claim 6, wherein the control circuit further comprises a power supply circuit;
the power supply circuit includes: the device comprises a filter circuit, a BUCK step-down circuit, a first LDO step-down circuit and a second LDO step-down circuit;
the input end of the filter circuit is connected with an external power supply through an input bus;
the input end of the BUCK step-down circuit is connected with the output end of the filter circuit;
the input end of the first LDO voltage reduction circuit is connected with the output end of the BUCK circuit, and the output end of the first LDO voltage reduction circuit is connected with the MCU circuit to provide stable voltage;
the input end of the second LDO voltage reduction circuit is connected with the output end of the BUCK circuit, and the output end of the second LDO voltage reduction circuit and the current sampling circuit provide reference voltage;
the output end of the filter circuit is also respectively connected with the grid driving circuit and the inverter circuit to provide driving voltage.
8. The disk drive apparatus according to claim 7, wherein the control circuit further comprises: the bus sampling circuit is used for collecting and preprocessing a second current sampling signal of the input bus;
the bus sampling circuit includes: a bus current sampling resistor and a second operational amplifier circuit;
the bus current sampling resistor is connected in series between the input buses, and two ends of the bus current sampling resistor are respectively connected with two input pins of the second operational amplifier circuit for receiving the second current sampling signals;
the pin of the second operational amplification circuit for outputting the preprocessed second current sampling signal is connected with the MCU circuit, so that the MCU circuit determines whether to stop driving the motor according to the preprocessed second current sampling signal.
9. The disk drive apparatus according to claim 1, wherein the control circuit further comprises: a rotor position feedback circuit;
the rotor position feedback circuit comprises a magnetic encoder for acquiring rotor position information of the motor, and the magnetic encoder is in communication connection with the MCU circuit so that the MCU circuit can adjust the initial PWM signal according to the rotor position information.
CN202322236593.9U 2023-08-21 2023-08-21 Disk drive device Active CN220796290U (en)

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CN202322236593.9U CN220796290U (en) 2023-08-21 2023-08-21 Disk drive device

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