WO2018205452A1 - Control circuit for high-speed fan - Google Patents

Control circuit for high-speed fan Download PDF

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Publication number
WO2018205452A1
WO2018205452A1 PCT/CN2017/098880 CN2017098880W WO2018205452A1 WO 2018205452 A1 WO2018205452 A1 WO 2018205452A1 CN 2017098880 W CN2017098880 W CN 2017098880W WO 2018205452 A1 WO2018205452 A1 WO 2018205452A1
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WIPO (PCT)
Prior art keywords
resistor
comparator
connection point
respectively connected
capacitor
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PCT/CN2017/098880
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French (fr)
Chinese (zh)
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林�源
宜尔轩
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深圳市物种起源科技有限公司
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Publication of WO2018205452A1 publication Critical patent/WO2018205452A1/en

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P6/00—Arrangements for controlling synchronous motors or other dynamo-electric motors using electronic commutation dependent on the rotor position; Electronic commutators therefor
    • H02P6/14—Electronic commutators

Definitions

  • the utility model relates to a driving control scheme for a high-speed motor, which is mainly used for controlling a three-phase non-inductive brushless motor with an electronic speed exceeding 600000 RPM, in particular a high-speed fan control circuit.
  • the three-phase non-inductive brushless motor drive needs to detect the motor zero-crossing signal for motor commutation operation during operation.
  • the existing non-inductive brushless motor drive mainly uses the analog-to-digital converter (ADC) of the microcontroller (MCU).
  • ADC analog-to-digital converter
  • MCU microcontroller
  • the back electromotive force signal of the non-inductive brushless motor is detected, and the zero-crossing signal is obtained through calculation, and the phase of the motor and the commutation period are calculated to control the commutation of the non-inductive brushless motor, and the analog-to-digital conversion and the operation are complicated. It is impossible to make a quick judgment to control the high-speed operation after the motor is driven, which affects the practicability.
  • the purpose of the utility model is to design a high-speed fan control circuit with simple calculation of the zero-crossing signal and simple conversion of the phase to improve the practicability.
  • the utility model relates to a high-speed fan control circuit, which comprises a microcontroller, a comparator U21, a comparator U22, a comparator U23, a resistor R10, a resistor R11, a resistor R12, a resistor R13, a resistor R14, a resistor R15, and a resistor. R17 and resistor R18;
  • the resistor R11 is connected in series with the resistor R12
  • the resistor R14 is connected in series with the resistor R15
  • the resistor R17 is connected in series with the resistor R18
  • the resistor R12, the resistor R15 and the resistor R18 are respectively connected to the three-phase touch on the three-phase non-inductive brushless motor in the high-speed fan.
  • the inverting input terminal of the comparator U21, the inverting input terminal of the comparator U22, the inverting input terminal of the comparator U23, the end of the resistor R13, and the end of the resistor R16 are all connected to one end of the resistor R10, and the resistor R11 and the resistor R12 are connected.
  • connection point between the connection is connected to the other end of the resistor R10, the connection point between the resistor R14 and the resistor R15 is connected to the other end of the R13, the connection point between the resistor R17 and the resistor R18 is connected to the other end of the R16, and the resistor R11 and The connection point between the resistor R12, the connection point between the resistor R14 and the resistor R15, and the connection point between the resistor R17 and the resistor R18 are voltage division points of the voltage;
  • the non-inverting input terminal of the comparator U21 is connected between the connection point between the resistor R11 and the resistor R12 and the resistor R10, and the non-inverting input terminal of the comparator U22 is connected between the connection point between the resistor R14 and the resistor R15 and the resistor R13.
  • the non-inverting input terminal of the comparator U23 is connected between the connection point between the resistor R117 and the resistor R18 and the resistor R16;
  • comparator U21 The output of comparator U21, the output of comparator U22, and the output of comparator U23 are all coupled to the microcontroller.
  • the resistors R44, R45 and the resistor R46 are further connected, and the two ends of the resistor R44 are respectively connected to the positive pole and the output end of the power supply of the comparator U21; the two ends of the resistor R45 are respectively connected with the positive pole and the output end of the power supply of the comparator U22; Both ends of the R46 are respectively connected to the positive and output terminals of the comparator U23.
  • the capacitor C23, the capacitor C24 and the capacitor C25 are further connected, and the two ends of the capacitor C23 are respectively connected with the connection point between the resistor R10 and the voltage dividing point and the ground end of the R11, and the two ends of the capacitor C24 are respectively connected with the resistor R13 and the minute.
  • the connection point between the pressure points is connected to the ground end of R14, and the two ends of the capacitor C25 are respectively connected with the connection point between the resistor R16 and the voltage dividing point and the ground end of the R17.
  • the utility model relates to a high-speed fan control circuit, which greatly simplifies the calculation of the zero-crossing signal of the microcontroller, reduces the calculation pressure of the microcontroller, and the microcontroller can only judge by detecting the high and low levels.
  • Zero-crossing of the motor optimizes the calculation process and reduces the amount of system calculation when achieving the same drive capability and protection capability. At the same time, it can realize high-speed non-inductive brushless motor drive with low-cost low-performance microcontroller.
  • Using the cost of the microcontroller further, it can quickly make judgments and control the motor drive after high-speed operation, and also has the function of protecting the brushless motor and the circuit during operation.
  • FIG. 1 is a structural diagram of a control circuit of Embodiment 1;
  • FIG. 2 is a flow chart of the commutation control of the first embodiment.
  • a high-speed fan control circuit described in this embodiment includes a microcontroller, a comparator U21, a comparator U22, a comparator U23, a resistor R10, a resistor R11, a resistor R12, and a resistor. R13, resistor R14, resistor R15, resistor R17 and resistor R18;
  • the resistor R11 is connected in series with the resistor R12
  • the resistor R14 is connected in series with the resistor R15
  • the resistor R17 is connected in series with the resistor R18
  • the resistor R12, the resistor R15 and the resistor R18 are respectively connected to the three-phase touch on the three-phase non-inductive brushless motor in the high-speed fan.
  • the non-inverting input terminal of the comparator U21 is connected between the connection point between the resistor R11 and the resistor R12 and the resistor R10, and the non-inverting input terminal of the comparator U22 is connected between the connection point between the resistor R14 and the resistor R15 and the resistor R13.
  • the non-inverting input terminal of the comparator U23 is connected between the connection point between the resistor R117 and the resistor R18 and the resistor R16;
  • comparator U21 The output of comparator U21, the output of comparator U22, and the output of comparator U23 are all coupled to the microcontroller.
  • the resistors R44, R45 and the resistor R46 are further included.
  • the two ends of the resistor R44 are respectively connected to the positive pole and the output end of the power supply of the comparator U21.
  • the two ends of the resistor R45 are respectively connected to the positive pole and the output end of the power supply of the comparator U22.
  • Both ends of the resistor R46 are respectively connected to the positive and output terminals of the power supply of the comparator U23.
  • the resistors R44, R45 and R46 are the pull-up resistors of the comparator, so that the voltage output during the voltage output is the same as the voltage of the pull-up resistor, further performing the function of stabilizing the output, and also having the voltage during the voltage output. Anti-interference function.
  • the capacitor C23, the capacitor C24 and the capacitor C25 are further included.
  • the two ends of the capacitor C23 are respectively connected with the connection point between the resistor R10 and the voltage dividing point and the ground end of the R11, and the two ends of the capacitor C24 are respectively connected with the resistor R13 and
  • the connection point between the voltage dividing points is connected to the ground terminal of R14, and the two ends of the capacitor C25 are respectively connected with the connection point between the resistor R16 and the voltage dividing point and the ground end of the R17.
  • the capacitor C23, the capacitor C24 and the capacitor C25 play a role in preventing the passage of direct current in the circuit, and are more convenient for dividing the two resistors at the voltage dividing point, and at the same time making the operation of the circuit more stable and reliable, and functioning as a protection circuit.
  • the connecting line MOTOR_A on the resistor R12, the connecting line MOTOR_B on the resistor R15, and the connecting line MOTOR_C on the resistor R18 are driving lines connected with the three-phase non-inductive brushless motor, and the resistor R10, the resistor R13 and the resistor R16 can be used.
  • the midpoint potential SENSE_M is generated on the connection line of the inverting input terminals of the comparator U21, the comparator U22, and the comparator U23, and the ratio of the resistance values of R11/R12, R14/R15, and R17/R18 can be adjusted for different motors to change the comparator.
  • the comparator compares the midpoint potential SENSE_M and the divided motor three-phase signals EMBF_A, EMBF_B, EMBF_C to output the pre-zero signal, high and low level, micro-control
  • the MCU only needs to detect the high and low level zero-crossing signals output by the comparator to determine the zero crossing, without complicated analog-to-digital conversion and calculation.
  • the microcontroller 1 (MCU) will first judge the phase of the motor. When the phase angle is within the set range, it will further judge whether the signal before the zero-crossing of the comparator is correct and accumulate the normal zero-crossing signal. After enough correct zero-crossing signals, the motor starts normally and enters the normal commutation operation. Otherwise, it brakes and gives an alarm signal.
  • the above model of the microcontroller uses STM32F103CBT6.
  • the present invention is not limited to the above-described preferred embodiments, and any other form of product can be derived by anyone of the present invention, but any change in its shape or structure, which is the same as the present application. Or similar technical solutions fall within the scope of protection of the present invention.

Abstract

Disclosed is a control circuit for a high-speed fan. A first resistor (R11) is connected to a second resistor (R12) in series. A third resistor (R14) is connected to a fourth resistor (R15) in series. A fifth resistor (R17) is connected to a sixth resistor (R18) in series. The second resistor (R12), the fourth resistor (R15) and the sixth resistor (R18) are respectively connected to a three-phase contact on a three-phase sensorless and brushless motor. One end of each of three comparators (U21, U22, U23), a seventh resistor (R13) and an eighth resistor (R16) is connected to one end of a ninth resistor (R10). A first connection point between the first resistor (R11) and the second resistor (R12), a second connection point between the third resistor (R14) and the fourth resistor (R15), and a third connection point between the fifth resistor (R17) and the sixth resistor (R18) are respectively connected to the other end of each of the ninth resistor (R10), the seventh resistor (R13) and the eighth resistor (R16). In-phase input ends of the three comparators are respectively connected to the first connection point, the second connection point and the third connection point. According to the control circuit, the computation pressure of a microcontroller unit is reduced by means of simplifying the computation of a zero-cross signal, and the computation process is optimized and costs are reduced.

Description

一种高转速风机控制电路High-speed fan control circuit 技术领域Technical field
本实用新型涉及一种针对于高转速电机的驱动控制方案，主要用于控制电子转速超过600000RPM以上转速的三相无感无刷电机，尤其是一种高转速风机控制电路。The utility model relates to a driving control scheme for a high-speed motor, which is mainly used for controlling a three-phase non-inductive brushless motor with an electronic speed exceeding 600000 RPM, in particular a high-speed fan control circuit.
背景技术Background technique
三相无感无刷电机驱动在工作时需要检测电机过零信号用于电机换相运算，现有的无感无刷电机驱动主要利用微控制器(MCU)的模拟数字转换器(ADC)对无感无刷电机的反电动势信号进行检测，通过计算获得过零信号，并以此计算电机的相位以及换相周期从而控制无感无刷电机的换相，而且模拟数字转换以及运算较为复杂，无法快速的作出判断进行控制电机驱动后高转速运行，影响实用性；另外在电机高速旋转时需要占用大量的运算资源，当电子转速600000RPM以上的转速，若要在电机的电子换相周期内实现所有运算，需要100MHz以上主频的高性能的微控制器(MCU)才能够很好的实现正常的控制、通讯与换相功能，由于高性能的微控制器(MCU)价格昂贵，所以增加了成本。The three-phase non-inductive brushless motor drive needs to detect the motor zero-crossing signal for motor commutation operation during operation. The existing non-inductive brushless motor drive mainly uses the analog-to-digital converter (ADC) of the microcontroller (MCU). The back electromotive force signal of the non-inductive brushless motor is detected, and the zero-crossing signal is obtained through calculation, and the phase of the motor and the commutation period are calculated to control the commutation of the non-inductive brushless motor, and the analog-to-digital conversion and the operation are complicated. It is impossible to make a quick judgment to control the high-speed operation after the motor is driven, which affects the practicability. In addition, when the motor rotates at a high speed, it requires a large amount of computing resources. When the electronic speed is above 600,000 RPM, it must be realized in the electronic commutation period of the motor. All high-performance microcontrollers (MCUs) that require a frequency of more than 100MHz can achieve normal control, communication, and commutation functions. Since high-performance microcontrollers (MCUs) are expensive, they have increased. cost.
因此，有鉴于常见的先前技术有上述缺点，发明人针对前述缺点研究改进之道，终于有本实用新型的产生。Therefore, in view of the above-mentioned shortcomings of the conventional prior art, the inventors have researched and improved the above-mentioned shortcomings, and finally have the present invention.
发明内容Summary of the invention
本实用新型的目的是为了解决上述技术的不足而设计的一种过零信号的运算和相位的换算简单，提高实用性的一种高转速风机控制电路。The purpose of the utility model is to design a high-speed fan control circuit with simple calculation of the zero-crossing signal and simple conversion of the phase to improve the practicability.
本实用新型所设计的一种高转速风机控制电路，包括微控制器、比较器U21、比较器U22、比较器U23、电阻R10、电阻R11、电阻R12、电阻R13、电阻R14、电阻R15、电阻R17和电阻R18； The utility model relates to a high-speed fan control circuit, which comprises a microcontroller, a comparator U21, a comparator U22, a comparator U23, a resistor R10, a resistor R11, a resistor R12, a resistor R13, a resistor R14, a resistor R15, and a resistor. R17 and resistor R18;
电阻R11与电阻R12串联连接，电阻R14与电阻R15串联连接，电阻R17与电阻R18串联连接，电阻R12、电阻R15和电阻R18分别与高转速风机中三相无感无刷电机上的三相触点连接；The resistor R11 is connected in series with the resistor R12, the resistor R14 is connected in series with the resistor R15, the resistor R17 is connected in series with the resistor R18, and the resistor R12, the resistor R15 and the resistor R18 are respectively connected to the three-phase touch on the three-phase non-inductive brushless motor in the high-speed fan. Point connection
比较器U21的反相输入端、比较器U22的反相输入端、比较器U23的反相输入端、电阻R13的一端和电阻R16的一端均与电阻R10的一端连接，电阻R11与电阻R12之间的连接点与电阻R10的另一端连接，电阻R14与电阻R15之间的连接点与R13的另一端连接，电阻R17与电阻R18之间的连接点与R16的另一端连接，并且电阻R11与电阻R12之间的连接点、电阻R14与电阻R15之间的连接点、电阻R17与电阻R18之间的连接点均为电压的分压点；The inverting input terminal of the comparator U21, the inverting input terminal of the comparator U22, the inverting input terminal of the comparator U23, the end of the resistor R13, and the end of the resistor R16 are all connected to one end of the resistor R10, and the resistor R11 and the resistor R12 are connected. The connection point between the connection is connected to the other end of the resistor R10, the connection point between the resistor R14 and the resistor R15 is connected to the other end of the R13, the connection point between the resistor R17 and the resistor R18 is connected to the other end of the R16, and the resistor R11 and The connection point between the resistor R12, the connection point between the resistor R14 and the resistor R15, and the connection point between the resistor R17 and the resistor R18 are voltage division points of the voltage;
比较器U21的同相输入端连接于电阻R11与电阻R12之间的连接点和电阻R10之间，比较器U22的同相输入端连接于电阻R14与电阻R15之间的连接点和电阻R13之间，比较器U23的同相输入端连接于电阻R117与电阻R18之间的连接点和电阻R16之间；The non-inverting input terminal of the comparator U21 is connected between the connection point between the resistor R11 and the resistor R12 and the resistor R10, and the non-inverting input terminal of the comparator U22 is connected between the connection point between the resistor R14 and the resistor R15 and the resistor R13. The non-inverting input terminal of the comparator U23 is connected between the connection point between the resistor R117 and the resistor R18 and the resistor R16;
比较器U21的输出端、比较器U22的输出端和比较器U23的输出端均与微控制器连接。The output of comparator U21, the output of comparator U22, and the output of comparator U23 are all coupled to the microcontroller.
进一步优选，还包括电阻R44、R45和电阻R46，电阻R44的两端分别与比较器U21的电源正极和输出端连接；电阻R45的两端分别与比较器U22的电源正极和输出端连接；电阻R46的两端分别与比较器U23的电源正极和输出端连接。Further preferably, the resistors R44, R45 and the resistor R46 are further connected, and the two ends of the resistor R44 are respectively connected to the positive pole and the output end of the power supply of the comparator U21; the two ends of the resistor R45 are respectively connected with the positive pole and the output end of the power supply of the comparator U22; Both ends of the R46 are respectively connected to the positive and output terminals of the comparator U23.
进一步优选，还包括电容C23、电容C24和电容C25，电容C23的两端分别与电阻R10和分压点之间的连接点和R11的接地端连接，电容C24的两端分别与电阻R13和分压点之间的连接点和R14的接地端连接，电容C25的两端分别与电阻R16和分压点之间的连接点和R17的接地端连接。 Further preferably, the capacitor C23, the capacitor C24 and the capacitor C25 are further connected, and the two ends of the capacitor C23 are respectively connected with the connection point between the resistor R10 and the voltage dividing point and the ground end of the R11, and the two ends of the capacitor C24 are respectively connected with the resistor R13 and the minute. The connection point between the pressure points is connected to the ground end of R14, and the two ends of the capacitor C25 are respectively connected with the connection point between the resistor R16 and the voltage dividing point and the ground end of the R17.
本实用新型所设计的一种高转速风机控制电路，其结构通过大幅简化了微控制器对于过零信号的计算，降低微控制器的计算压力，并且微控制器仅可通过检测高低电平判断电机过零，优化了计算流程，在实现同样驱动能力及保护能力时降低系统运算量；同时能够利用价格较低的低性能微控制器就可实现高转速的无感无刷电机驱动，降低了使用微控制器的成本，进一步，可快速的作出判断并进行控制电机驱动后高转速运行，还具有在运行是保护无刷电机和电路的作用。The utility model relates to a high-speed fan control circuit, which greatly simplifies the calculation of the zero-crossing signal of the microcontroller, reduces the calculation pressure of the microcontroller, and the microcontroller can only judge by detecting the high and low levels. Zero-crossing of the motor optimizes the calculation process and reduces the amount of system calculation when achieving the same drive capability and protection capability. At the same time, it can realize high-speed non-inductive brushless motor drive with low-cost low-performance microcontroller. Using the cost of the microcontroller, further, it can quickly make judgments and control the motor drive after high-speed operation, and also has the function of protecting the brushless motor and the circuit during operation.
附图说明DRAWINGS
图1是实施例1的控制电路结构图；1 is a structural diagram of a control circuit of Embodiment 1;
图2是实施例1的换相控制流程图。2 is a flow chart of the commutation control of the first embodiment.
具体实施方式detailed description
下面将结合本实用新型实施例中的附图，对本实用新型实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本实用新型一部分实施例，而不是全部的实施例。基于本实用新型中的实施例，本领域普通技术人员所获得的所有其他实施例，都属于本实用新型保护的范围。The technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the drawings in the embodiments of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. example. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention are within the scope of the present invention.
实施例1：Example 1:
如图1和图2所示，本实施例所描述的一种高转速风机控制电路，包括微控制器、比较器U21、比较器U22、比较器U23、电阻R10、电阻R11、电阻R12、电阻R13、电阻R14、电阻R15、电阻R17和电阻R18；As shown in FIG. 1 and FIG. 2, a high-speed fan control circuit described in this embodiment includes a microcontroller, a comparator U21, a comparator U22, a comparator U23, a resistor R10, a resistor R11, a resistor R12, and a resistor. R13, resistor R14, resistor R15, resistor R17 and resistor R18;
电阻R11与电阻R12串联连接，电阻R14与电阻R15串联连接，电阻R17与电阻R18串联连接，电阻R12、电阻R15和电阻R18分别与高转速风机中三相无感无刷电机上的三相触点连接；The resistor R11 is connected in series with the resistor R12, the resistor R14 is connected in series with the resistor R15, the resistor R17 is connected in series with the resistor R18, and the resistor R12, the resistor R15 and the resistor R18 are respectively connected to the three-phase touch on the three-phase non-inductive brushless motor in the high-speed fan. Point connection
比较器U21的反相输入端、比较器U22的反相输入端、比较器U23的反相 输入端、电阻R13的一端和电阻R16的一端均与电阻R10的一端连接，电阻R11与电阻R12之间的连接点与电阻R10的另一端连接，电阻R14与电阻R15之间的连接点与R13的另一端连接，电阻R17与电阻R18之间的连接点与R16的另一端连接，并且电阻R11与电阻R12之间的连接点、电阻R14与电阻R15之间的连接点、电阻R17与电阻R18之间的连接点均为电压的分压点；Inverting input of comparator U21, inverting input of comparator U22, inverting of comparator U23 The input terminal, one end of the resistor R13 and one end of the resistor R16 are connected to one end of the resistor R10, the connection point between the resistor R11 and the resistor R12 is connected to the other end of the resistor R10, and the connection point between the resistor R14 and the resistor R15 and the R13 The other end is connected, the connection point between the resistor R17 and the resistor R18 is connected to the other end of the R16, and the connection point between the resistor R11 and the resistor R12, the connection point between the resistor R14 and the resistor R15, the resistor R17 and the resistor R18 The connection point between them is the voltage dividing point of the voltage;
比较器U21的同相输入端连接于电阻R11与电阻R12之间的连接点和电阻R10之间，比较器U22的同相输入端连接于电阻R14与电阻R15之间的连接点和电阻R13之间，比较器U23的同相输入端连接于电阻R117与电阻R18之间的连接点和电阻R16之间；The non-inverting input terminal of the comparator U21 is connected between the connection point between the resistor R11 and the resistor R12 and the resistor R10, and the non-inverting input terminal of the comparator U22 is connected between the connection point between the resistor R14 and the resistor R15 and the resistor R13. The non-inverting input terminal of the comparator U23 is connected between the connection point between the resistor R117 and the resistor R18 and the resistor R16;
比较器U21的输出端、比较器U22的输出端和比较器U23的输出端均与微控制器连接。The output of comparator U21, the output of comparator U22, and the output of comparator U23 are all coupled to the microcontroller.
本实施例中还包括电阻R44、R45和电阻R46，电阻R44的两端分别与比较器U21的电源正极和输出端连接；电阻R45的两端分别与比较器U22的电源正极和输出端连接；电阻R46的两端分别与比较器U23的电源正极和输出端连接。其中电阻R44、R45和电阻R46为比较器的上拉电阻，使得电压输出的过程中输出的电压与上拉电阻的电压相同，进一步进行稳定输出的作用，还具有在电压输出的过程中进行电压抗干扰的功能。In this embodiment, the resistors R44, R45 and the resistor R46 are further included. The two ends of the resistor R44 are respectively connected to the positive pole and the output end of the power supply of the comparator U21. The two ends of the resistor R45 are respectively connected to the positive pole and the output end of the power supply of the comparator U22. Both ends of the resistor R46 are respectively connected to the positive and output terminals of the power supply of the comparator U23. The resistors R44, R45 and R46 are the pull-up resistors of the comparator, so that the voltage output during the voltage output is the same as the voltage of the pull-up resistor, further performing the function of stabilizing the output, and also having the voltage during the voltage output. Anti-interference function.
本实施例中还包括电容C23、电容C24和电容C25，电容C23的两端分别与电阻R10和分压点之间的连接点和R11的接地端连接，电容C24的两端分别与电阻R13和分压点之间的连接点和R14的接地端连接，电容C25的两端分别与电阻R16和分压点之间的连接点和R17的接地端连接。其中电容C23、电容C24和电容C25在电路中起到阻止直流电通过的作用，更便于分压点上的两个电阻进行分压，同时使得电路的运行更加稳定可靠，起到保护电路的作用。 In this embodiment, the capacitor C23, the capacitor C24 and the capacitor C25 are further included. The two ends of the capacitor C23 are respectively connected with the connection point between the resistor R10 and the voltage dividing point and the ground end of the R11, and the two ends of the capacitor C24 are respectively connected with the resistor R13 and The connection point between the voltage dividing points is connected to the ground terminal of R14, and the two ends of the capacitor C25 are respectively connected with the connection point between the resistor R16 and the voltage dividing point and the ground end of the R17. The capacitor C23, the capacitor C24 and the capacitor C25 play a role in preventing the passage of direct current in the circuit, and are more convenient for dividing the two resistors at the voltage dividing point, and at the same time making the operation of the circuit more stable and reliable, and functioning as a protection circuit.
工作原理：电阻R12上的连接线MOTOR_A、电阻R15上的连接线MOTOR_B、电阻R18上的连接线MOTOR_C为与三相无感无刷电机连接的驱动线，通过电阻R10、电阻R13、电阻R16可以在比较器U21、比较器U22、比较器U23的反相输入端的连接线上产生中点电位SENSE_M，并且针对不同电机调整R11/R12、R14/R15、R17/R18阻值的比值可以改变比较器U21、比较器U22、比较器U23的翻转时机，比较器通过比较中点电位SENSE_M以及分压后的电机三相信号EMBF_A、EMBF_B、EMBF_C从而输出以高低电平表示的过零前信号，微控制器1(MCU)仅需要检测比较器输出的高低电平过零信号即可判断过零，无需复杂的模拟数字转换以及运算。Working principle: the connecting line MOTOR_A on the resistor R12, the connecting line MOTOR_B on the resistor R15, and the connecting line MOTOR_C on the resistor R18 are driving lines connected with the three-phase non-inductive brushless motor, and the resistor R10, the resistor R13 and the resistor R16 can be used. The midpoint potential SENSE_M is generated on the connection line of the inverting input terminals of the comparator U21, the comparator U22, and the comparator U23, and the ratio of the resistance values of R11/R12, R14/R15, and R17/R18 can be adjusted for different motors to change the comparator. U21, comparator U22, comparator U23 flip timing, the comparator compares the midpoint potential SENSE_M and the divided motor three-phase signals EMBF_A, EMBF_B, EMBF_C to output the pre-zero signal, high and low level, micro-control The MCU only needs to detect the high and low level zero-crossing signals output by the comparator to determine the zero crossing, without complicated analog-to-digital conversion and calculation.
同时，电机起动时微控制器1(MCU)会首先判断电机相位，相位角在设定范围内时会进一步判断比较器输出的过零前信号是否正确并累加存储正常的过零信号，在检测到足够多的正确过零信号后电机启动正常，进入正常的换相运算，反之则刹车并给出报警信号。At the same time, when the motor starts, the microcontroller 1 (MCU) will first judge the phase of the motor. When the phase angle is within the set range, it will further judge whether the signal before the zero-crossing of the comparator is correct and accumulate the normal zero-crossing signal. After enough correct zero-crossing signals, the motor starts normally and enters the normal commutation operation. Otherwise, it brakes and gives an alarm signal.
其中上述的微控制器的型号采用STM32F103CBT6。The above model of the microcontroller uses STM32F103CBT6.
本实用新型不局限于上述最佳实施方式，任何人在本实用新型的启示下都可得出其他各种形式的产品，但不论在其形状或结构上作任何变化，凡是具有与本申请相同或相近似的技术方案，均落在本实用新型的保护范围之内。 The present invention is not limited to the above-described preferred embodiments, and any other form of product can be derived by anyone of the present invention, but any change in its shape or structure, which is the same as the present application. Or similar technical solutions fall within the scope of protection of the present invention.

Claims (3)

  1. 一种高转速风机控制电路，其特征在于，包括：A high speed fan control circuit is characterized by comprising:
    微控制器、比较器U21、比较器U22、比较器U23、电阻R10、电阻R11、电阻R12、电阻R13、电阻R14、电阻R15、电阻R17和电阻R18；Microcontroller, comparator U21, comparator U22, comparator U23, resistor R10, resistor R11, resistor R12, resistor R13, resistor R14, resistor R15, resistor R17 and resistor R18;
    电阻R11与电阻R12串联连接，电阻R14与电阻R15串联连接，电阻R17与电阻R18串联连接，电阻R12、电阻R15和电阻R18分别与高转速风机中三相无感无刷电机上的三相触点连接；The resistor R11 is connected in series with the resistor R12, the resistor R14 is connected in series with the resistor R15, the resistor R17 is connected in series with the resistor R18, and the resistor R12, the resistor R15 and the resistor R18 are respectively connected to the three-phase touch on the three-phase non-inductive brushless motor in the high-speed fan. Point connection
    比较器U21的反相输入端、比较器U22的反相输入端、比较器U23的反相输入端、电阻R13的一端和电阻R16的一端均与电阻R10的一端连接，电阻R11与电阻R12之间的连接点与电阻R10的另一端连接，电阻R14与电阻R15之间的连接点与R13的另一端连接，电阻R17与电阻R18之间的连接点与R16的另一端连接，并且电阻R11与电阻R12之间的连接点、电阻R14与电阻R15之间的连接点、电阻R17与电阻R18之间的连接点均为电压的分压点；The inverting input terminal of the comparator U21, the inverting input terminal of the comparator U22, the inverting input terminal of the comparator U23, the end of the resistor R13, and the end of the resistor R16 are all connected to one end of the resistor R10, and the resistor R11 and the resistor R12 are connected. The connection point between the connection is connected to the other end of the resistor R10, the connection point between the resistor R14 and the resistor R15 is connected to the other end of the R13, the connection point between the resistor R17 and the resistor R18 is connected to the other end of the R16, and the resistor R11 and The connection point between the resistor R12, the connection point between the resistor R14 and the resistor R15, and the connection point between the resistor R17 and the resistor R18 are voltage division points of the voltage;
    比较器U21的同相输入端连接于电阻R11与电阻R12之间的连接点和电阻R10之间，比较器U22的同相输入端连接于电阻R14与电阻R15之间的连接点和电阻R13之间，比较器U23的同相输入端连接于电阻R117与电阻R18之间的连接点和电阻R16之间；The non-inverting input terminal of the comparator U21 is connected between the connection point between the resistor R11 and the resistor R12 and the resistor R10, and the non-inverting input terminal of the comparator U22 is connected between the connection point between the resistor R14 and the resistor R15 and the resistor R13. The non-inverting input terminal of the comparator U23 is connected between the connection point between the resistor R117 and the resistor R18 and the resistor R16;
    比较器U21的输出端、比较器U22的输出端和比较器U23的输出端均与微控制器连接。The output of comparator U21, the output of comparator U22, and the output of comparator U23 are all coupled to the microcontroller.
  2. 根据权利要求1所述的一种高转速风机控制电路，其特征在于，还包括电阻R44、R45和电阻R46，电阻R44的两端分别与比较器U21的电源正极和输出端连接；电阻R45的两端分别与比较器U22的电源正极和输出端连接；电阻R46的两端分别与比较器U23的电源正极和输出端连接。A high-speed fan control circuit according to claim 1, further comprising resistors R44, R45 and a resistor R46, wherein two ends of the resistor R44 are respectively connected to the positive and output terminals of the comparator U21; The two ends are respectively connected with the positive pole and the output end of the power supply of the comparator U22; the two ends of the resistor R46 are respectively connected with the positive pole and the output end of the power supply of the comparator U23.
  3. 根据权利要求1所述的一种高转速风机控制电路，其特征在于，还包括电容 C23、电容C24和电容C25，电容C23的两端分别与电阻R10和分压点之间的连接点和R11的接地端连接，电容C24的两端分别与电阻R13和分压点之间的连接点和R14的接地端连接，电容C25的两端分别与电阻R16和分压点之间的连接点和R17的接地端连接。 A high speed fan control circuit according to claim 1 further comprising a capacitor C23, capacitor C24 and capacitor C25, the two ends of the capacitor C23 are respectively connected with the connection point between the resistor R10 and the voltage dividing point and the ground end of the R11, and the two ends of the capacitor C24 are respectively connected with the resistor R13 and the voltage dividing point. The point is connected to the ground terminal of R14, and the two ends of the capacitor C25 are respectively connected with the connection point between the resistor R16 and the voltage dividing point and the ground end of the R17.
PCT/CN2017/098880 2017-05-09 2017-08-24 Control circuit for high-speed fan WO2018205452A1 (en)

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