CN220067255U - BLDC drive circuit - Google Patents
BLDC drive circuit Download PDFInfo
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- CN220067255U CN220067255U CN202320980687.4U CN202320980687U CN220067255U CN 220067255 U CN220067255 U CN 220067255U CN 202320980687 U CN202320980687 U CN 202320980687U CN 220067255 U CN220067255 U CN 220067255U
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- power supply
- bridge arm
- main control
- mcu main
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- 238000005070 sampling Methods 0.000 claims abstract description 20
- 238000009529 body temperature measurement Methods 0.000 claims abstract description 8
- 238000010586 diagram Methods 0.000 description 9
- 238000001914 filtration Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 208000032170 Congenital Abnormalities Diseases 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
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Abstract
The utility model discloses a BLDC driving circuit which comprises a power supply unit, an MCU main control unit, a bridge arm driving unit, a three-phase bridge arm unit, a communication interface unit, a phase current sampling amplifying unit, a power supply voltage acquisition unit and a temperature measurement unit, wherein the power supply unit is connected with the MCU main control unit; the power supply unit is respectively connected with the bridge arm driving unit, the three-phase bridge arm unit, the communication interface unit and the power supply voltage acquisition unit, and the MCU main control unit is respectively connected with the bridge arm driving unit, the communication interface unit, the phase current sampling amplifying unit, the power supply voltage acquisition unit and the temperature measurement unit. The communication interface unit adopts two communication interfaces of RS-485 and RS-232, and the phase current sampling amplifying unit adopts a special amplifying chip, so that the phase current sampling amplifying unit can be compatible with more types of drivers, is simple in parameter adjustment, has high precision, and can better realize torque control of a motor.
Description
Technical Field
The utility model belongs to the field of brushless direct current motors, and particularly relates to a BLDC driving circuit.
Background
BLDC (Brushless Direct Current Motor) it is a brushless DC motor, which overcomes the congenital defect of the brush DC motor, replaces the motor with mechanical commutator with electronic commutator, and has the advantages of simple structure, no commutation spark, reliable operation and easy maintenance, etc. of AC motor, and it is a three-phase AC permanent magnet synchronous motor with rotor position feedback.
The BLDC driving circuit is a circuit for driving the BLDC, that is, the brushless dc motor to operate, and in the prior art, the BLDC driving circuit adopts a single communication interface, which makes the adaptation and compatibility of the communication interface unit poor; in the prior art, an operational amplifier circuit is generally adopted to sample phase current, the parameter adjustment is troublesome, the precision is not high, and the motor cannot be well controlled in moment.
Disclosure of Invention
The utility model aims to provide a BLDC driving circuit.
To achieve the above object, the solution of the present utility model is: a BLDC driving circuit comprises a power supply unit, an MCU main control unit, a bridge arm driving unit, a three-phase bridge arm unit, a communication interface unit, a phase current sampling amplifying unit, a power supply voltage acquisition unit and a temperature measurement unit;
the MCU main control unit is respectively connected with the bridge arm driving unit, the communication interface unit, the phase current sampling amplifying unit, the power supply voltage acquisition unit and the temperature measurement unit;
the communication interface unit adopts two communication interfaces, namely RS-485 and RS-232;
the phase current sampling amplifying unit adopts a special amplifying chip.
The power supply unit is used for providing VCC voltage for the three-phase bridge arm unit and providing 5V voltage for the bridge arm driving unit and the communication interface unit.
Preferably, the communication interface is used for controlling the state of the BLDC driving circuit by external communication.
As a preferable scheme, the MCU unit controls the bridge arm driving unit to drive the three-phase bridge arm unit to output, and the output of the three-phase bridge arm unit is used for driving the BLDC.
The phase current sampling amplifying unit is connected with the three-phase bridge arm unit and the MCU main control unit and is used for enabling the MCU main control unit to monitor the current of the three-phase bridge arm unit.
As an optimal scheme, the power supply voltage acquisition unit is connected with the power supply input filter circuit of the power supply unit and the MCU main control unit and is used for enabling the MCU main control unit to monitor the VCC voltage state provided by the power supply input filter circuit of the power supply unit.
After the scheme is adopted, the gain effect of the utility model is as follows:
1. the communication interface unit adopts two communication interfaces, namely RS-485 and RS-232, so that the circuit has better adaptability and compatibility, and can be compatible with different drivers to work more efficiently;
2. the phase current sampling amplifying unit adopts a special amplifying chip instead of a common operational amplifying circuit, so that parameter adjustment of a circuit designer is easier, sampling precision is high, and torque control can be better carried out on BLDC.
Drawings
FIG. 1 is a schematic diagram of the general principle of the present utility model;
FIG. 2 is a circuit diagram of a power supply unit of the present utility model;
FIG. 3 is a circuit diagram of the MCU master control unit of the present utility model;
fig. 4 is a circuit diagram of the bridge arm driving unit of the present utility model;
FIG. 5 is a circuit diagram of a novel unit of the three-phase bridge arm unit of the present utility model;
FIG. 6 is a circuit diagram of a communication interface unit of the present utility model;
FIG. 7 is a circuit diagram of a phase current sampling amplification unit of the present utility model;
FIG. 8 is a circuit diagram of a power supply voltage acquisition unit of the present utility model;
FIG. 9 is a circuit diagram of a temperature measurement unit of the present utility model.
Detailed Description
The utility model will be described in detail with reference to the accompanying drawings and specific embodiments.
The utility model provides a BLDC driving circuit, as shown in figures 1-9, which comprises a power supply unit, an MCU main control unit, a bridge arm driving unit, a three-phase bridge arm unit, a communication interface unit, a phase current sampling amplifying unit, a power supply voltage collecting unit and a temperature measuring unit; the MCU main control unit is respectively connected with the bridge arm driving unit, the communication interface unit, the phase current sampling amplifying unit, the power supply voltage acquisition unit and the temperature measurement unit;
as shown in fig. 1, the power supply unit provides VCC voltage for the three-phase bridge arm unit, and provides 5V voltage for the bridge arm driving unit and the communication interface unit, the MCU unit controls the bridge arm driving unit to drive the output of the three-phase bridge arm unit, the output of the three-phase bridge arm unit is used for driving BLDC, the communication interface is used for controlling the state of the BLDC driver by external communication, the phase current sampling and amplifying unit is connected with the three-phase bridge arm unit and the MCU main control unit, and is used for enabling the MCU main control unit to monitor the current of the three-phase bridge arm unit, and the power supply voltage collecting unit is connected with the power supply input filtering loop of the power supply unit and the MCU main control unit, and is used for enabling the MCU main control unit to monitor the VCC voltage state provided by the power supply input filtering loop of the power supply unit.
BLDC driving principle: the MCU main control unit outputs AH, AL, BH, BL, CH, CL signals to the bridge arm driving unit, the signals are SPWM signals, the bridge arm driving unit amplifies the signals and outputs the signals as HO1, LO1, HO2, LO2, HO3 and LO2 signals, the signals control MOS tubes on the three-phase bridge arm unit, the MOS tubes are used as a switch model, the MOS switches are sequentially turned on and off, and the three-phase SPWM signals are output: u, V, W, the three-phase SPWM signal drives the motor into operation.
The working principle and the function of the communication interface unit are as follows: meanwhile, two communication interfaces, namely an RS-232 interface and an RS-485 interface, are respectively provided with TX1, RX1, TX2 and RX2 ports and are connected with the MCU main control unit for transmitting and sending data so as to realize the control of the external state of the BLDC drive circuit.
Phase current sampling amplifying unit theory of operation and effect: the special amplifying chip is adopted to replace an operational amplifying circuit, U, V signals of the three-phase bridge arm units and the potentials VS1 and VS2 separated from U, V by a resistor are used as inputs to sample, and the result is output to the MCU main control unit to judge whether the current is overloaded or not.
The power supply unit works as follows: 24V is the existing power supply, and this embodiment requires two voltages: VCC and 5V, through filtering 24V voltage, obtain VCC voltage, produce a steady voltage of 5V through a voltage stabilizing circuit by VCC.
The power supply voltage acquisition unit acts as follows: and outputting the VCC voltage generated by the power supply unit to the MCU main control unit through the RC circuit to judge whether the VCC voltage is abnormal or not.
The working function of the temperature measuring unit is as follows: and detecting the temperature change and outputting the temperature change to the MCU main control unit to prevent the circuit temperature from being too high.
As above, the power supply unit provides power supply voltage, the MCU main control unit controls the bridge arm driving unit to drive the three bridge arm units, and outputs three-phase SPWM signals to control the motor to work, the communication interface unit realizes the control of driving the motor externally, the phase current sampling amplifying unit prevents current overload, the power supply voltage collecting unit ensures voltage stability, the temperature measuring unit ensures that the circuit is not overheated, and finally the BLDC is driven.
The above embodiments are only preferred embodiments of the present utility model, and are not limited to the present utility model, and all equivalent changes made according to the design key of the present utility model fall within the protection scope of the present utility model.
Claims (6)
1. A BLDC driving circuit, characterized in that: the system comprises a power supply unit, an MCU main control unit, a bridge arm driving unit, a three-phase bridge arm unit, a communication interface unit, a phase current sampling amplifying unit, a power supply voltage acquisition unit and a temperature measurement unit;
the MCU main control unit is respectively connected with the bridge arm driving unit, the communication interface unit, the phase current sampling amplifying unit, the power supply voltage acquisition unit and the temperature measurement unit;
the communication interface unit adopts two communication interfaces, namely RS-485 and RS-232;
the phase current sampling amplifying unit adopts a special amplifying chip.
2. A BLDC driving circuit as in claim 1, wherein: the power supply unit provides VCC voltage for the three-phase bridge arm unit and provides 5V voltage for the bridge arm driving unit and the communication interface unit.
3. A BLDC driving circuit as in claim 1, wherein: and the MCU main control unit controls the bridge arm driving unit to drive the three-phase bridge arm unit to output, and the output of the three-phase bridge arm unit is used for driving the BLDC.
4. A BLDC driving circuit as in claim 1, wherein: the communication interface is used for controlling the state of the BLDC driving circuit through external communication.
5. A BLDC driving circuit as in claim 1, wherein: the phase current sampling amplifying unit is connected with the three-phase bridge arm unit and the MCU main control unit and is used for enabling the MCU main control unit to monitor the current of the three-phase bridge arm unit.
6. A BLDC driving circuit as in claim 1, wherein: the power supply voltage acquisition unit is connected with the power supply input filter circuit of the power supply unit and the MCU main control unit and is used for enabling the MCU main control unit to monitor the VCC voltage state provided by the power supply input filter circuit of the power supply unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320980687.4U CN220067255U (en) | 2023-04-26 | 2023-04-26 | BLDC drive circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320980687.4U CN220067255U (en) | 2023-04-26 | 2023-04-26 | BLDC drive circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220067255U true CN220067255U (en) | 2023-11-21 |
Family
ID=88785149
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320980687.4U Active CN220067255U (en) | 2023-04-26 | 2023-04-26 | BLDC drive circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220067255U (en) |
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2023
- 2023-04-26 CN CN202320980687.4U patent/CN220067255U/en active Active
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