WO2022252417A1 - Phase loss detection circuit for three-phase power source, and electric motor controller for bldc electric motor - Google Patents

Phase loss detection circuit for three-phase power source, and electric motor controller for bldc electric motor Download PDF

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WO2022252417A1
WO2022252417A1 PCT/CN2021/115565 CN2021115565W WO2022252417A1 WO 2022252417 A1 WO2022252417 A1 WO 2022252417A1 CN 2021115565 W CN2021115565 W CN 2021115565W WO 2022252417 A1 WO2022252417 A1 WO 2022252417A1
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circuit
phase
power supply
resistor
input
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PCT/CN2021/115565
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French (fr)
Chinese (zh)
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徐小三
陈云生
韦荣星
孙海荣
利鸿敬
王逊
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中山大洋电机股份有限公司
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Publication of WO2022252417A1 publication Critical patent/WO2022252417A1/en

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
    • G01R29/16—Measuring asymmetry of polyphase networks
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/40—Testing power supplies
    • G01R31/42—AC power supplies
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/08—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors
    • H02H7/09—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors against over-voltage; against reduction of voltage; against phase interruption
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P80/00—Climate change mitigation technologies for sector-wide applications
    • Y02P80/10—Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier

Definitions

  • the utility model relates to a three-phase power supply phase loss detection circuit and a motor controller of a BLDC motor.
  • This utility model is to provide a three-phase power supply phase loss detection circuit and its motor controller for BLDC motors, which can solve the problem that in the prior art, when the power supply phase is lacking, the product cannot detect abnormalities and continues to run, which eventually leads to the failure of the product itself. Damaged technical issues.
  • the purpose of this utility model is to provide a three-phase power supply phase loss detection circuit, which is characterized in that it includes 3-way rectifier circuit, step-down circuit, comparison circuit, and the input ends of the 3-way rectifier circuit are respectively connected to the three-phase input power supply U , V, W, the output terminals of the 3-way rectifier circuit are connected together as the input terminal of the step-down circuit, the output terminal of the step-down circuit is connected to the input terminal of the comparison circuit, and the output terminal of the comparison circuit is used as the phase-loss signal of the three-phase power supply output.
  • One of the above-mentioned rectification circuits is composed of a diode and a current limiting resistor.
  • the step-down circuit described above is composed of a resistor R4 and a resistor R5 connected in series. After the resistor R4 and the resistor R5 are connected in series, one end is grounded, and the other end is connected to the output end of the rectifier circuit.
  • the comparison circuit described above includes a comparator IC1, a voltage dividing resistor R6 and a voltage dividing resistor R7; after the resistor R6 and the resistor R7 are connected in series, one end is connected to the power supply VCC, and the other end is grounded to GND, and the middle point between the resistor R6 and the resistor R7 is the comparison reference voltage , as an input terminal of the comparator IC1, and another comparison input terminal of the comparator IC1 is drawn between the resistor R4 and the resistor R5.
  • a kind of motor controller of BLDC motor it is characterized in that: comprise three-phase rectification circuit, inverter circuit and microprocessor MCU, three-phase input power supply U, V, W are connected to the input terminal of three-phase rectification circuit, three-phase rectification
  • the output end of the circuit is connected to the input end of the DC-DC conversion power supply circuit, and the output end of the DC-DC conversion power supply circuit provides different power supply voltages for the inverter circuit and the microprocessor MCU, and the microprocessor MCU according to the parameters of the motor operation process
  • the output control signal controls the work of the inverter circuit, the output end of the inverter circuit is connected to the stator coil winding of the BLDC motor, and it is characterized in that: it also includes a three-phase power supply phase loss detection circuit, and the three-phase power supply phase loss detection circuit is the above-mentioned Described a kind of phase loss detection circuit of three-phase power supply, the output end of comparison circuit is connected the input end
  • a phase loss detection circuit for a three-phase power supply characterized in that it includes 3-way rectifier circuit, step-down circuit, and comparison circuit, the input terminals of the 3-way rectifier circuit are respectively connected to three-phase input power supply U, V, W, The output terminals of the 3-way rectifier circuit are connected together as the input terminal of the step-down circuit, the output terminal of the step-down circuit is connected to the input terminal of the comparison circuit, and the output terminal of the comparison circuit is used as the output terminal of the three-phase power supply phase loss signal.
  • the shutdown operation can be performed immediately to protect components, improve the stability and reliability of the circuit, and the circuit structure is simple.
  • Fig. 1 is a schematic diagram of the principle provided by Embodiment 1 of the utility model
  • Fig. 2 is another schematic diagram of the principle provided by the first embodiment of the utility model
  • Fig. 3 is a schematic diagram of the waveforms of the three-phase input power supplies U, V, and W provided by Embodiment 1 of the present invention when there is no phase loss;
  • Fig. 4 is a schematic diagram of the waveforms of the three-phase input power supplies U, V, and W provided by Embodiment 1 of the present invention in the case of phase loss;
  • Fig. 5 is a schematic diagram of the principle of Embodiment 2 of the present invention.
  • this embodiment provides a three-phase power supply phase loss detection circuit, which is characterized in that it includes 3-way rectifier circuit, step-down circuit, comparison circuit, and the input of 3-way rectifier circuit
  • the terminals are respectively connected to the three-phase input power supply U, V, W, the output terminals of the three-way rectifier circuit are connected together as the input terminal of the step-down circuit, the output terminal of the step-down circuit is connected to the input terminal of the comparison circuit, and the output terminal of the comparison circuit
  • the terminal is used as the output terminal of the phase loss signal of the three-phase power supply.
  • One of the above-mentioned rectification circuits is composed of a diode and a current limiting resistor; the first circuit of the rectification circuit is composed of a diode D1 and a current limiting resistor R1; the second circuit of the rectification circuit is composed of a diode D2 and a current limiting resistor Composed of R2; the third circuit of the rectifier circuit is composed of diode D3 and current limiting resistor R3.
  • the above step-down circuit is composed of a resistor R4 and a resistor R5 connected in series, one end of the resistor R4 and R5 is connected to the ground, and the other end is connected to the output end of the rectifier circuit.
  • the above comparison circuit includes a comparator IC1, a voltage dividing resistor R6 and a voltage dividing resistor R7; after the resistor R6 and the resistor R7 are connected in series, one end is connected to the power supply VCC, and the other end is grounded to GND, and the middle point between the resistor R6 and the resistor R7 is a comparison reference voltage, as An input terminal of the comparator IC1 is drawn between the resistor R4 and the resistor R5 as another comparison input terminal of the comparator IC1.
  • a motor controller of a BLDC motor is characterized in that: it includes a three-phase rectification circuit, an inverter circuit and a microprocessor MCU, and the three-phase input power supply U, V, W is connected to the three-phase rectification circuit
  • the input terminal and the output terminal of the three-phase rectification circuit are connected to the input terminal of the DC-DC conversion power supply circuit, and the output terminal of the DC-DC conversion power supply circuit provides different power supply voltages to supply power for the inverter circuit and the microprocessor MCU, and the microprocessor MCU According to the parameter output control signal of the motor operation process, the inverter circuit is controlled to work.
  • the output terminal of the inverter circuit is connected to the stator coil winding of the BLDC motor, and it is characterized in that: it also includes a three-phase power supply phase loss detection circuit, and the three-phase power supply
  • the lack of phase detection circuit is a three-phase power supply phase loss detection circuit described in the first embodiment above.
  • the output end of the comparison circuit is connected to the input end of the microprocessor MCU, and the microprocessor MCU judges whether there is a phase loss according to the output signal of the comparison circuit. , if there is a lack of phase, the microprocessor MCU controls the inverter circuit to stop the operation, protect components, improve the stability and reliability of the circuit, and the circuit structure is simple.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Control Of Ac Motors In General (AREA)
  • Emergency Protection Circuit Devices (AREA)
  • Protection Of Static Devices (AREA)

Abstract

A phase loss detection circuit for a three-phase power source, and an electric motor controller for a BLDC electric motor. The detection circuit comprises three rectification circuits, a step-down circuit and a comparison circuit, wherein input ends of the three rectification circuits are respectively connected to three-phase input power sources U, V, W, and output ends of the three rectification circuits are connected together to serve as an input end of the step-down circuit; and an output end of the step-down circuit is connected to an input end of the comparison circuit, and an output end of the comparison circuit serves as a phase loss signal output end of a three-phase power source. When it is detected that a phase loss occurs in an input power source, a shutdown operation can be performed immediately, thereby protecting a component and improving the stability and reliability of a circuit; and a circuit structure is simple.

Description

一种三相电源缺相检测电路及BLDC电机的电机控制器A three-phase power supply phase loss detection circuit and a motor controller of a BLDC motor 技术领域：Technical field:
本实用新型涉及一种三相电源缺相检测电路及BLDC电机的电机控制器。The utility model relates to a three-phase power supply phase loss detection circuit and a motor controller of a BLDC motor.
背景技术：Background technique:
业内，关于直流三相电机通常只会考虑电机部分三相端缺相保护，而忽略电源部分三相输入没有对电源端进行监测，这样就导致了在电源缺相时，产品不能检测到异常，继续运行，最终导致产品本身损坏，产品可靠性差。In the industry, regarding DC three-phase motors, usually only the phase loss protection of the three-phase terminals of the motor part is considered, and the three-phase input of the power supply part is ignored without monitoring the power supply terminal. Continued operation will eventually lead to damage to the product itself and poor product reliability.
发明内容：Invention content:
本实用新型的目的是提供一种三相电源缺相检测电路及其BLDC电机的电机控制器，能解决现有技术中在电源缺相时，产品不能检测到异常，继续运行，最终导致产品本身损坏的技术问题。The purpose of this utility model is to provide a three-phase power supply phase loss detection circuit and its motor controller for BLDC motors, which can solve the problem that in the prior art, when the power supply phase is lacking, the product cannot detect abnormalities and continues to run, which eventually leads to the failure of the product itself. Damaged technical issues.
本实用新型的目的是通过下述技术方案予以实现的。The purpose of this utility model is achieved through the following technical solutions.
本实用新型的目的是提供一种三相电源缺相检测电路,其特征在于：包括3路的整流电路、降压电路、比较电路，3路的整流电路的输入端分别连接三相输入电源U、V、W，3路的整流电路的输出端连接在一起作为降压电路的输入端，降压电路的输出端连接到比较电路的输入端，比较电路的输出端作为三相电源缺相信号输出端。The purpose of this utility model is to provide a three-phase power supply phase loss detection circuit, which is characterized in that it includes 3-way rectifier circuit, step-down circuit, comparison circuit, and the input ends of the 3-way rectifier circuit are respectively connected to the three-phase input power supply U , V, W, the output terminals of the 3-way rectifier circuit are connected together as the input terminal of the step-down circuit, the output terminal of the step-down circuit is connected to the input terminal of the comparison circuit, and the output terminal of the comparison circuit is used as the phase-loss signal of the three-phase power supply output.
上述所述的其中1路的整流电路是由一个二极管和一个限流电阻组成。One of the above-mentioned rectification circuits is composed of a diode and a current limiting resistor.
上述所述的降压电路是电阻R4和电阻R5串联而成，电阻R4和电阻R5串联后一端接地，另一端连接整流电路的输出端。The step-down circuit described above is composed of a resistor R4 and a resistor R5 connected in series. After the resistor R4 and the resistor R5 are connected in series, one end is grounded, and the other end is connected to the output end of the rectifier circuit.
上述所述的比较电路包括比较器IC1、分压电阻R6和分压电阻R7；电阻R6和电阻R7串联后一端连接电源VCC，另一端接地GND,电阻R6和电阻R7的中间点是比较参考电压，作为比较器IC1的一个输入端，电阻R4和电阻R5之间引出作为比较器IC1的的另一个比较输入端。The comparison circuit described above includes a comparator IC1, a voltage dividing resistor R6 and a voltage dividing resistor R7; after the resistor R6 and the resistor R7 are connected in series, one end is connected to the power supply VCC, and the other end is grounded to GND, and the middle point between the resistor R6 and the resistor R7 is the comparison reference voltage , as an input terminal of the comparator IC1, and another comparison input terminal of the comparator IC1 is drawn between the resistor R4 and the resistor R5.
一种BLDC电机的电机控制器，其特征在于：包括三相整流电路、逆变电路和微处理器MCU，三相输入电源U、V、W连接到三相整流电路的输入端，三相整 流电路的输出端连接到DC-DC转换电源电路输入端，DC-DC转换电源电路的输出端提供不同的供电电压为逆变电路和微处理器MCU供电，微处理器MCU根据电机运行过程的参数输出控制信号控制逆变电路工作，逆变电路的输出端连接BLDC电机的定子线圈绕组，其特征在于：它还包括三相电源缺相检测电路，所述的三相电源缺相检测电路是上述所述的一种三相电源缺相检测电路，比较电路的输出端连接微处理器MCU的输入端，微处理器MCU根据比较电路的输出信号判断是否缺相，如果缺相，微处理器MCU控制逆变电路进行停机操作。A kind of motor controller of BLDC motor, it is characterized in that: comprise three-phase rectification circuit, inverter circuit and microprocessor MCU, three-phase input power supply U, V, W are connected to the input terminal of three-phase rectification circuit, three-phase rectification The output end of the circuit is connected to the input end of the DC-DC conversion power supply circuit, and the output end of the DC-DC conversion power supply circuit provides different power supply voltages for the inverter circuit and the microprocessor MCU, and the microprocessor MCU according to the parameters of the motor operation process The output control signal controls the work of the inverter circuit, the output end of the inverter circuit is connected to the stator coil winding of the BLDC motor, and it is characterized in that: it also includes a three-phase power supply phase loss detection circuit, and the three-phase power supply phase loss detection circuit is the above-mentioned Described a kind of phase loss detection circuit of three-phase power supply, the output end of comparison circuit is connected the input end of microprocessor MCU, and microprocessor MCU judges whether lack of phase according to the output signal of comparison circuit, if lack of phase, microprocessor MCU Control the inverter circuit to stop the operation.
本实用新型与现有技术相比，具有如下效果：Compared with the prior art, the utility model has the following effects:
1)一种三相电源缺相检测电路,其特征在于：包括3路的整流电路、降压电路、比较电路，3路的整流电路的输入端分别连接三相输入电源U、V、W，3路的整流电路的输出端连接在一起作为降压电路的输入端，降压电路的输出端连接到比较电路的输入端，比较电路的输出端作为三相电源缺相信号输出端，当检测到输入电源出现缺相时，可以立刻作出停机操作，保护元器件，提高电路的稳定性和可靠性，电路结构简单。1) A phase loss detection circuit for a three-phase power supply, characterized in that it includes 3-way rectifier circuit, step-down circuit, and comparison circuit, the input terminals of the 3-way rectifier circuit are respectively connected to three-phase input power supply U, V, W, The output terminals of the 3-way rectifier circuit are connected together as the input terminal of the step-down circuit, the output terminal of the step-down circuit is connected to the input terminal of the comparison circuit, and the output terminal of the comparison circuit is used as the output terminal of the three-phase power supply phase loss signal. When there is a phase loss in the input power supply, the shutdown operation can be performed immediately to protect components, improve the stability and reliability of the circuit, and the circuit structure is simple.
2)本实用新型的其它优点在实施例部分展开详细描述。2) Other advantages of the present utility model are described in detail in the embodiment section.
附图说明：Description of drawings:
图1是本实用新型实施例一提供的原理示意图；Fig. 1 is a schematic diagram of the principle provided by Embodiment 1 of the utility model;
图2是本实用新型实施例一提供的另一原理示意图；Fig. 2 is another schematic diagram of the principle provided by the first embodiment of the utility model;
图3是本实用新型实施例一提供的三相输入电源U、V、W在没有缺相情况下的波形示意图；Fig. 3 is a schematic diagram of the waveforms of the three-phase input power supplies U, V, and W provided by Embodiment 1 of the present invention when there is no phase loss;
图4是本实用新型实施例一提供的三相输入电源U、V、W在缺相情况下的波形示意图；Fig. 4 is a schematic diagram of the waveforms of the three-phase input power supplies U, V, and W provided by Embodiment 1 of the present invention in the case of phase loss;
图5是本实用新型实施例二的原理示意图。Fig. 5 is a schematic diagram of the principle of Embodiment 2 of the present invention.
具体实施方式：Detailed ways:
下面通过具体实施例并结合附图对本实用新型作进一步详细的描述。The utility model will be described in further detail below through specific embodiments in conjunction with the accompanying drawings.
实施例一:Embodiment one:
如图1至图4所示，本实施例提供的是一种三相电源缺相检测电路,其特征在于：包括3路的整流电路、降压电路、比较电路，3路的整流电路的输入端分别连接三相输入电源U、V、W，3路的整流电路的输出端连接在一起作为降压电路的输入端，降压电路的输出端连接到比较电路的输入端，比较电路的输出端作为三相电源缺相信号输出端，当检测到输入电源出现缺相时，可以立刻作出停机操作，保护元器件，提高电路的稳定性和可靠性，电路结构简单。As shown in Figures 1 to 4, this embodiment provides a three-phase power supply phase loss detection circuit, which is characterized in that it includes 3-way rectifier circuit, step-down circuit, comparison circuit, and the input of 3-way rectifier circuit The terminals are respectively connected to the three-phase input power supply U, V, W, the output terminals of the three-way rectifier circuit are connected together as the input terminal of the step-down circuit, the output terminal of the step-down circuit is connected to the input terminal of the comparison circuit, and the output terminal of the comparison circuit The terminal is used as the output terminal of the phase loss signal of the three-phase power supply. When a phase loss of the input power supply is detected, the shutdown operation can be performed immediately to protect components and improve the stability and reliability of the circuit. The circuit structure is simple.
当三相输入电源U、V、W在没有缺相的情况下，比较器输出端的端口的波形情况在限值线上分布，如图3所示。When the three-phase input power supply U, V, W has no phase loss, the waveforms of the ports at the output end of the comparator are distributed on the limit line, as shown in Figure 3.
当三相输入电源U、V、W在缺相的情况下，比较器输出端的端口的波形情况在限制线之间分布，如图4所示。When the three-phase input power supply U, V, W is in a phase loss situation, the waveform of the port at the output end of the comparator is distributed among the limit lines, as shown in FIG. 4 .
上述的其中1路的整流电路是由一个二极管和一个限流电阻组成；整流电路的第一路电路由二极管D1和限流电阻R1组成；整流电路的第二路电路由二极管D2和限流电阻R2组成；整流电路的第三路电路由二极管D3和限流电阻R3组成。One of the above-mentioned rectification circuits is composed of a diode and a current limiting resistor; the first circuit of the rectification circuit is composed of a diode D1 and a current limiting resistor R1; the second circuit of the rectification circuit is composed of a diode D2 and a current limiting resistor Composed of R2; the third circuit of the rectifier circuit is composed of diode D3 and current limiting resistor R3.
上述的降压电路是电阻R4和电阻R5串联而成，电阻R4和电阻R5串联后一端接地，另一端连接整流电路的输出端。The above step-down circuit is composed of a resistor R4 and a resistor R5 connected in series, one end of the resistor R4 and R5 is connected to the ground, and the other end is connected to the output end of the rectifier circuit.
上述的比较电路包括比较器IC1、分压电阻R6和分压电阻R7；电阻R6和电阻R7串联后一端连接电源VCC，另一端接地GND,电阻R6和电阻R7的中间点是比较参考电压，作为比较器IC1的一个输入端，电阻R4和电阻R5之间引出作为比较器IC1的的另一个比较输入端。The above comparison circuit includes a comparator IC1, a voltage dividing resistor R6 and a voltage dividing resistor R7; after the resistor R6 and the resistor R7 are connected in series, one end is connected to the power supply VCC, and the other end is grounded to GND, and the middle point between the resistor R6 and the resistor R7 is a comparison reference voltage, as An input terminal of the comparator IC1 is drawn between the resistor R4 and the resistor R5 as another comparison input terminal of the comparator IC1.
实施例二：Embodiment two:
如图5所示，一种BLDC电机的电机控制器，其特征在于：包括三相整流电路、逆变电路和微处理器MCU，三相输入电源U、V、W连接到三相整流电路的输入端，三相整流电路的输出端连接到DC-DC转换电源电路输入端，DC-DC转换电源电路的输出端提供不同的供电电压为逆变电路和微处理器MCU供电，微处理 器MCU根据电机运行过程的参数输出控制信号控制逆变电路工作，逆变电路的输出端连接BLDC电机的定子线圈绕组，其特征在于：它还包括三相电源缺相检测电路，所述的三相电源缺相检测电路是上述实施例一所述的一种三相电源缺相检测电路，比较电路的输出端连接微处理器MCU的输入端，微处理器MCU根据比较电路的输出信号判断是否缺相，如果缺相，微处理器MCU控制逆变电路进行停机操作，保护元器件，提高电路的稳定性和可靠性，电路结构简单。As shown in Figure 5, a motor controller of a BLDC motor is characterized in that: it includes a three-phase rectification circuit, an inverter circuit and a microprocessor MCU, and the three-phase input power supply U, V, W is connected to the three-phase rectification circuit The input terminal and the output terminal of the three-phase rectification circuit are connected to the input terminal of the DC-DC conversion power supply circuit, and the output terminal of the DC-DC conversion power supply circuit provides different power supply voltages to supply power for the inverter circuit and the microprocessor MCU, and the microprocessor MCU According to the parameter output control signal of the motor operation process, the inverter circuit is controlled to work. The output terminal of the inverter circuit is connected to the stator coil winding of the BLDC motor, and it is characterized in that: it also includes a three-phase power supply phase loss detection circuit, and the three-phase power supply The lack of phase detection circuit is a three-phase power supply phase loss detection circuit described in the first embodiment above. The output end of the comparison circuit is connected to the input end of the microprocessor MCU, and the microprocessor MCU judges whether there is a phase loss according to the output signal of the comparison circuit. , if there is a lack of phase, the microprocessor MCU controls the inverter circuit to stop the operation, protect components, improve the stability and reliability of the circuit, and the circuit structure is simple.
以上实施例为本实用新型的较佳实施方式，但本实用新型的实施方式不限于此，其他任何未背离本实用新型的精神实质与原理下所作的改变、修饰、替代、组合、简化，均为等效的置换方式，都包含在本实用新型的保护范围之内。The above embodiment is a preferred embodiment of the present utility model, but the embodiment of the present utility model is not limited thereto, and any other changes, modifications, substitutions, combinations, and simplifications that do not deviate from the spirit and principles of the present utility model are all All equivalent replacement methods are included in the protection scope of the present utility model.

Claims (5)

  1. 一种三相电源缺相检测电路,其特征在于：包括3路的整流电路、降压电路、比较电路，3路的整流电路的输入端分别连接三相输入电源U、V、W，3路的整流电路的输出端连接在一起作为降压电路的输入端，降压电路的输出端连接到比较电路的输入端，比较电路的输出端作为三相电源缺相信号输出端。A three-phase power supply phase loss detection circuit is characterized in that: it includes 3-way rectifier circuit, step-down circuit, comparison circuit, the input ends of the 3-way rectifier circuit are respectively connected to the three-phase input power supply U, V, W, and the 3-way The output terminals of the rectification circuit are connected together as the input terminals of the step-down circuit, the output terminals of the step-down circuit are connected to the input terminals of the comparison circuit, and the output terminals of the comparison circuit are used as the output terminals of the three-phase power supply phase loss signal.
  2. 根据权利要求1所述的一种三相电源缺相检测电路,其特征在于：所述其中1路的整流电路是由一个二极管和一个限流电阻组成。A three-phase power supply phase loss detection circuit according to claim 1, characterized in that: the rectification circuit of one of them is composed of a diode and a current limiting resistor.
  3. 根据权利要求1或2所述的一种三相电源缺相检测电路,其特征在于：降压电路是电阻R4和电阻R5串联而成，电阻R4和电阻R5串联后一端接地，另一端连接整流电路的输出端。A three-phase power supply phase loss detection circuit according to claim 1 or 2, characterized in that: the step-down circuit is formed by series connection of resistance R4 and resistance R5, one end of resistance R4 and resistance R5 is connected to ground, and the other end is connected to rectifier output of the circuit.
  4. 根据权利要求3所述的一种三相电源缺相检测电路,其特征在于：比较电路包括比较器IC1、分压电阻R6和分压电阻R7；电阻R6和电阻R7串联后一端连接电源VCC，另一端接地GND,电阻R6和电阻R7的中间点是比较参考电压，作为比较器IC1的一个输入端，电阻R4和电阻R5之间引出作为比较器IC1的的另一个比较输入端。A three-phase power supply phase loss detection circuit according to claim 3, characterized in that: the comparison circuit includes a comparator IC1, a voltage divider resistor R6 and a voltage divider resistor R7; the resistor R6 and the resistor R7 are connected in series and one end is connected to the power supply VCC, The other end is grounded to GND, the middle point of the resistor R6 and the resistor R7 is a comparison reference voltage, which is used as an input terminal of the comparator IC1, and the connection between the resistor R4 and the resistor R5 is used as the other comparison input terminal of the comparator IC1.
  5. 一种BLDC电机的电机控制器，其特征在于：包括三相整流电路、逆变电路和微处理器MCU，三相输入电源U、V、W连接到三相整流电路的输入端，三相整流电路的输出端连接到DC-DC转换电源电路输入端，DC-DC转换电源电路的输出端提供不同的供电电压为逆变电路和微处理器MCU供电，微处理器MCU根据电机运行过程的参数输出控制信号控制逆变电路工作，逆变电路的输出端连接BLDC电机的定子线圈绕组，其特征在于：它还包括三相电源缺相检测电路，所述的三相电源缺相检测电路是权利要求1至4任意一项所述的一种三相电源缺相检测电路，比较电路的输出端连接微处理器MCU的输入端，微处理器MCU根据比较电路的输出信号判断是否缺相，如果缺相，微处理器MCU控制逆变电路进行停机操作。A kind of motor controller of BLDC motor, it is characterized in that: comprise three-phase rectification circuit, inverter circuit and microprocessor MCU, three-phase input power supply U, V, W are connected to the input terminal of three-phase rectification circuit, three-phase rectification The output end of the circuit is connected to the input end of the DC-DC conversion power supply circuit, and the output end of the DC-DC conversion power supply circuit provides different power supply voltages for the inverter circuit and the microprocessor MCU, and the microprocessor MCU according to the parameters of the motor operation process The output control signal controls the work of the inverter circuit. The output end of the inverter circuit is connected to the stator coil winding of the BLDC motor. It is characterized in that: it also includes a three-phase power supply phase loss detection circuit. The three-phase power supply phase loss detection circuit is the right A kind of three-phase power supply phase loss detection circuit described in any one of 1 to 4 is required, the output end of the comparison circuit is connected to the input end of the microprocessor MCU, and the microprocessor MCU judges whether there is a phase loss according to the output signal of the comparison circuit, if In case of phase loss, the microprocessor MCU controls the inverter circuit to stop the operation.
PCT/CN2021/115565 2021-06-02 2021-08-31 Phase loss detection circuit for three-phase power source, and electric motor controller for bldc electric motor WO2022252417A1 (en)

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