CN213879594U

CN213879594U - Single-wire transmission direct-current brushless motor position sensor circuit

Info

Publication number: CN213879594U
Application number: CN202022833814.7U
Authority: CN
Inventors: 李鹏; 彭智民
Original assignee: Linko Semiconductor Co ltd
Current assignee: Linko Semiconductor Co ltd
Priority date: 2020-12-01
Filing date: 2020-12-01
Publication date: 2021-08-03
Anticipated expiration: 2030-12-01

Abstract

The utility model discloses a single-line transmission direct current brushless motor position sensor circuit, which comprises a direct current brushless motor controller, 3 signal transmission cables and a Hall sensor arranged on a motor; the direct current brushless motor controller is connected with a Hall sensor arranged on the motor through 3 signal transmission cables; the Hall sensor power supply line and the Hall sensor ground wire supply power to the Hall sensor; hall sensor signal line transmission rotor position signal, direct current brushless motor controller sets up 1 hall signal interface and detects the rotor position of motor. The utility model discloses a DC brushless motor position sensor circuit based on single line transmission, through 1 signal line transmission rotor position signal, reduce the sensor connecting wire radical, reduce main control chip pin quantity resource simultaneously; the small and compact design is suitable for electric hand tools and small household appliances.

Description

Single-wire transmission direct-current brushless motor position sensor circuit

Technical Field

The utility model relates to a direct current brushless motor field especially relates to a direct current brushless motor position sensor circuit of single line transmission.

Background

The brushless DC motor has the characteristics of high power density, high rotating speed, low noise, lightness, energy conservation and the like, and is widely applied to production and life. The performance of a handheld tool powered by a lithium battery or a small household appliance for improving daily life of people is being updated and iterated at a high speed due to the use of a direct current brushless motor, so that the low-carbon development is promoted, the life cost is reduced, the energy is saved, and the environment is protected.

The direct current brushless motor carries out drive control through direct current brushless motor controller, direct current brushless motor internally mounted has 3 hall sensor, direct current brushless motor controller passes through the signal transmission cable conductor and gives the power supply of installing at the inside three hall sensor component of motor, and the rotor position signal that hall sensor component detected passes through the signal transmission cable conductor again and transmits to direct current brushless motor controller.

Because products such as handheld electric tool, small household electrical appliances that lithium cell group supplied power are very small and exquisite compact, among traditional hall sensor's the brushless direct current motor actuating system, detect being connected between hall sensor and the brushless direct current motor controller of rotor position and need 5 signal transmission cable conductors, as shown in figure 1, the brushless direct current motor controller passes through hall sensor power supply line and 2 power cords of ground wire and supplies power for hall sensor, simultaneously, through 3 signal lines of AD B/C signal line for transmit three-phase rotor position signal. The main control chip in the DC brushless motor controller needs 3 special Hall signal interfaces to detect the position of the rotor of the motor.

The traditional direct current brushless motor driving system with the hall sensor is not more and more in line with the requirements of pursuing small and compact size of products such as handheld electric tools and small household appliances powered by a lithium battery pack, and a solution for reducing the number of connecting wires of the sensor and reducing the number of pins of a main control chip is urgently needed.

SUMMERY OF THE UTILITY MODEL

The purpose of the invention is as follows: to above problem, the utility model provides a single line transmission's direct current brushless motor position sensor circuit through 1 signal line transmission three-phase rotor position signal, reduces the sensor connection line radical, reduces main control chip pin quantity resource.

The technical scheme is as follows: in order to achieve the above design purpose, the utility model adopts the following technical scheme: a single-wire transmission direct-current brushless motor position sensor circuit comprises a direct-current brushless motor controller, 3 signal transmission cables and a Hall sensor, wherein the Hall sensor is arranged on a motor; the direct current brushless motor controller is connected with a Hall sensor arranged on the motor through 3 signal transmission cables; the 3 signal transmission cables are respectively a Hall sensor power supply line, a Hall sensor ground wire and a Hall sensor signal line; the Hall sensor power supply line and the Hall sensor ground wire supply power to the Hall sensor; hall sensor signal line transmission rotor position signal, direct current brushless motor controller sets up 1 hall signal interface and detects the rotor position of motor.

Further, the HALL sensor comprises three HALL elements HALL _ A, HALL _ B, HALL _ C; a signal output pin of the first Hall element HALL _ A is connected with one end of the eighth resistor, a signal output pin of the second Hall element HALL _ B is connected with one end of the ninth resistor, and a signal output pin of the third Hall element HALL _ C is connected with one end of the tenth resistor; the other ends of the eighth resistor, the ninth resistor and the tenth resistor are connected together and then connected to the DC brushless motor controller through Hall sensor signal lines after combination.

Further, the direct current brushless motor controller comprises a main control chip, a seventh resistor and a sixth capacitor; the Hall sensor signal wire is pulled up to a +5V voltage-stabilized power supply through a seventh resistor, the Hall sensor signal wire is connected with an HALL _ ADC _ IN pin of a main control chip from the lower end of the seventh resistor, a voltage signal containing rotor position information is filtered by a sixth capacitor and then transmitted to the main control chip of the controller for signal acquisition, and the acquired voltage is logically decoded to restore an actual motor rotor position signal.

Furthermore, the signal output pin of the Hall element is internally in a triode open-drain output mode.

Has the advantages that: the utility model discloses a DC brushless motor position sensor circuit based on single line transmission, through 1 signal line transmission rotor position signal, reduce the sensor connecting wire radical, reduce main control chip pin quantity resource simultaneously; the small and compact design is suitable for electric hand tools and small household appliances.

Drawings

FIG. 1 is a schematic diagram of a prior art DC brushless motor position sensor signal transmission;

fig. 2 is a circuit diagram of a single-line transmission dc brushless motor position sensor according to the present invention.

Detailed Description

The technical solution of the present invention will be further explained with reference to the accompanying drawings and examples.

As shown in fig. 2, single line transmission's direct current brushless motor position sensor circuit, detect the hall sensor of rotor position and the direct current brushless motor controller between be connected 3 signal transmission cable lines, wherein, power supply line and 2 power cords of ground wire are the hall sensor power supply, through remaining 1 signal line transmission three-phase rotor position signal, the main control chip of direct current brushless motor controller the inside only needs 1 dedicated hall signal interface to detect the rotor position of motor.

Specifically, the single-line transmission dc brushless motor position sensor circuit of the present invention comprises a dc

brushless motor controller

1, 3 signal transmission cables 2, and a hall sensor 3 mounted on the motor; the DC brushless motor controller is connected with a Hall sensor arranged on the motor through 3 signal transmission cables.

Wherein, 3 signal transmission cable lines are hall sensor power supply line, hall sensor ground wire, hall sensor signal line respectively.

The Hall sensor comprises three Hall elements HALL _ A, HALL _ B, HALL _ C, a triode open-drain output mode is arranged in a signal output pin, the output 0 potential is equivalent grounding, the output 1 potential is equivalent suspension, and the signal output pins of the three Hall elements HALL _ A, HALL _ B, HALL _ C are respectively connected with one ends of three resistors R8, R9 and R10.

The signal output pin of the first HALL element HALL _ a is connected to one end of the eighth resistor R8, the signal output pin of the second HALL element HALL _ B is connected to one end of the ninth resistor R9, and the signal output pin of the third HALL element HALL _ C is connected to one end of the tenth resistor R10. The other ends of the three resistors R8, R9 and R10 are connected together and are combined and then transmitted to the DC brushless motor controller through Hall sensor signal wires.

The direct current brushless motor controller comprises a main control chip and a peripheral circuit, and comprises a seventh resistor R7 and a sixth capacitor C6. And a Hall sensor signal wire is pulled up to a +5V stabilized voltage power supply through a seventh resistor R7, is connected with an HALL _ ADC _ IN pin of the main control chip from the lower end of the seventh resistor R7, and outputs a signal containing rotor position information to the main control chip of the controller for signal sampling. Voltage signals containing rotor position information are filtered by a sixth capacitor C6 and then transmitted to a HALL _ ADC _ IN pin of a controller main control chip for signal acquisition, and the acquired voltage restores actual motor rotor position signals according to logic decoding as described below.

The Hall signal logic switch states are 6 combinations of binary codes 101, 100, 110, 010, 011, 001 and the like respectively, and are translated into 6 states of 16 binary codes of 5, 4, 6, 2, 3, 1 and the like. Specifically, the method comprises the following steps:

HALL_ADC(5)＝+5V/(R7+R9)*R9

the voltage was calculated to be 2.5V according to this example

HALL_ADC(4)＝+5V/(R7+((R9*R10)/(R9+R10))*((R9*R10)/(R9+R10))

The voltage was calculated to be 1.263V according to this example

HALL_ADC(6)＝+5V/(R7+R10)*R10

According to this routine, the voltage is calculated to be 1.688V

HALL_ADC(2)＝+5V/(R7+((R8*R10)/(R8+R10))*((R8*R10)/(R8+R10))

The voltage was calculated to be 1.445V according to this example

HALL_ADC(3)＝+5V/(R7+R8)*R8

According to this routine, the voltage is calculated to be 3.333V

HALL_ADC(1)＝+5V/(R7+((R8*R9)/(R8+R9))*((R8*R9)/(R8+R9))

The voltage was calculated to be 2.0V according to this routine.

Claims

1. A single-wire transmission direct-current brushless motor position sensor circuit is characterized in that: the device comprises a direct current brushless motor controller (1), 3 signal transmission cables (2) and a Hall sensor (3) arranged on a motor; the direct current brushless motor controller is connected with a Hall sensor arranged on the motor through 3 signal transmission cables;

the 3 signal transmission cables are respectively a Hall sensor power supply line, a Hall sensor ground wire and a Hall sensor signal line; the Hall sensor power supply line and the Hall sensor ground wire supply power to the Hall sensor; hall sensor signal line transmission rotor position signal, direct current brushless motor controller sets up 1 hall signal interface and detects the rotor position of motor.

2. The single-wire transmitted dc brushless motor position sensor circuit of claim 1, wherein: the HALL sensor comprises three HALL elements HALL _ A, HALL _ B, HALL _ C.

3. The single-wire transmitted dc brushless motor position sensor circuit of claim 2, wherein: a signal output pin of the first HALL element HALL _ a is connected with one end of an eighth resistor (R8), a signal output pin of the second HALL element HALL _ B is connected with one end of a ninth resistor (R9), and a signal output pin of the third HALL element HALL _ C is connected with one end of a tenth resistor (R10); the other ends of the eighth resistor (R8), the ninth resistor (R9) and the tenth resistor (R10) are connected together and are connected to the DC brushless motor controller through Hall sensor signal wires after being combined.

4. The single-wire transmitted dc brushless motor position sensor circuit of claim 1, wherein: the direct current brushless motor controller comprises a main control chip, a seventh resistor (R7) and a sixth capacitor (C6).

5. The single-wire transmitted brushless dc motor position sensor circuit of claim 4, wherein: the Hall sensor signal wire is pulled up to a +5V stabilized voltage power supply through a seventh resistor (R7), the Hall sensor signal wire is connected with an HALL _ ADC _ IN pin of a main control chip from the lower end of the seventh resistor (R7), a voltage signal containing rotor position information is filtered by a sixth capacitor (C6) and then transmitted to the main control chip of the controller for signal acquisition, and the acquired voltage is logically decoded to restore an actual motor rotor position signal.

6. The single-wire transmitted dc brushless motor position sensor circuit of claim 2, wherein: the signal output pin of the Hall element is internally in a triode open-drain output mode.