CN201307842Y - Opposing electromotive force zero crossing detection circuit of sensorless and brushless DC motor - Google Patents

Opposing electromotive force zero crossing detection circuit of sensorless and brushless DC motor Download PDF

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Publication number
CN201307842Y
CN201307842Y CNU2008203022676U CN200820302267U CN201307842Y CN 201307842 Y CN201307842 Y CN 201307842Y CN U2008203022676 U CNU2008203022676 U CN U2008203022676U CN 200820302267 U CN200820302267 U CN 200820302267U CN 201307842 Y CN201307842 Y CN 201307842Y
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CN
China
Prior art keywords
electromotive force
detection circuit
resistance
opposing electromotive
driving voltage
Prior art date
Application number
CNU2008203022676U
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Chinese (zh)
Inventor
刘瑜
胡丽花
潘海鹏
Original Assignee
潘亚君
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Priority to CNU2008203022676U priority Critical patent/CN201307842Y/en
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Publication of CN201307842Y publication Critical patent/CN201307842Y/en

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Abstract

The utility model relates to an opposing electromotive force zero crossing detection circuit of sensorless and brushless DC motor, which comprises a singlechip, an opposing electromotive force detection circuit and a driving voltage detection circuit. The opposing electromotive force detection circuit comprises divider resistances, filter capacitors and catching diodes of detection opposing electromotive forces; the driving voltage detection circuit comprises the divider resistances and the filter capacitor; the opposing electromotive force detection circuit adopts unified divider ratio, and the divider ratio is larger than the divider ratio of the driving voltage detection circuit; and when the voltage detected by the opposing electromotive force detection circuit forms a certain proportional relation with the voltage detected by the driving voltage detection circuit, opposing electromotive force zero crossing is determined. The utility model has the advantages that different resistor divider ratios are adopted, the detection precision of opposing electromotive force is improved, the measuring precision of location of an electric motor rotor is enhanced, thus obtaining a better commutation point in time.

Description

A kind of back electromotive force zero-crossing detection circuit that does not have the sensing dc brushless motor

Technical field

The utility model belongs to the no sensing Driving technique of brshless DC motor.

Background technology

The tradition brush direct current motor is because the reason of life-span and noise can not be applied to some special occasions.And the brshless DC motor of employing belt sensor, the problem that can bring manufacturing, difficulty and long-term immersion oil are installed.Therefore the no sensing Driving technique of brshless DC motor has extremely important and uses widely.

The control of the rotating speed of brshless DC motor is by driving voltage is regulated, and comes the power supply of switch motor to realize according to the position of rotor.Because the rotor-position and the back electromotive force of brshless DC motor have definite corresponding relation,, just need not the sensing element of detection rotor position if therefore determine the rotor-position of brshless DC motor by detecting counter electromotive force of motor.But back electromotive force can not directly detect, and can only obtain indirectly by detecting phase voltage.Such as, when A, B switch on mutually, detect the C phase voltage, when the C phase voltage equal driving voltage 1/2 the time, be defined as the zero crossing of back electromotive force.

Under the overwhelming majority situation, driving voltage, phase voltage all greater than the supply power voltage VCC of single-chip microcomputer, detect because must carry out dividing potential drop, make the later magnitude of voltage of dividing potential drop be less than or equal to VCC.When detected phase voltage equal driving voltage 1/2 the time, be defined as the zero crossing of back electromotive force.But after the vast scale dividing potential drop, the accuracy of detection of phase voltage reduces greatly, thereby influences the commutation precision.

Summary of the invention

The present invention seeks to determine motor rotor position, obtain accurate commutation point, thereby realize the no transducer control effect of more stable brshless DC motor in order to improve the back electromotive force zero-crossing accuracy of detection.

The technical scheme that its technical problem that solves the utility model adopts is:

A kind of back electromotive force zero-crossing detection circuit that does not have the sensing dc brushless motor comprises single-chip microcomputer 1, counter electromotive force detection circuit, driving voltage testing circuit.Described counter electromotive force detection circuit, by the resistance R 1, resistance R 4, capacitor C 1 and the diode D1 that detect A phase back electromotive force, detect resistance R 2, resistance R 5, capacitor C 2 and the diode D2 of B phase back electromotive force, the resistance R 3, resistance R 6, capacitor C 3 and the diode D3 that detect B phase back electromotive force form; Described driving voltage testing circuit is made up of resistance R 7, resistance R 8 and capacitor C 4; Described counter electromotive force detection circuit, voltage ratio R4/ (R1+R4)=R5/ (R2+R5)=R6/ (R3+R6); Described driving voltage testing circuit, voltage ratio R8/ (R7+R8) is less than voltage ratio R4/ (R1+R4), R5/ (R2+R5), the R6/ (R3+R6) of electromotive force testing circuit.The magnitude of voltage that detects when described counter electromotive force detection circuit equals the R4 that described drive voltage circuit detects magnitude of voltage * (R7+R8)/(2 * R8 * (R1+R4)), or R5 * (R7+R8)/(2 * R8 * (R2+R5)), or R6 * (R7+R8)/(2 * R8 * (R3+R6)) time, determine back electromotive force zero-crossing.

The beneficial effects of the utility model mainly show: 1, circuit structure is simple, and cost is low; 2, the back electromotive force zero-crossing accuracy of detection effectively improves; 3, software is realized simple.

Description of drawings

Fig. 1 is the schematic diagram of the back electromotive force zero-crossing detection circuit of no sensing dc brushless motor.

Embodiment

Below in conjunction with accompanying drawing the utility model is further described.

With reference to Fig. 1, a kind of back electromotive force zero-crossing detection circuit that does not have the sensing dc brushless motor comprises single-chip microcomputer 1, counter electromotive force detection circuit, driving voltage testing circuit.

Counter electromotive force detection circuit, by the resistance R 1, resistance R 4, capacitor C 1 and the diode D1 that detect A phase back electromotive force, detect resistance R 2, resistance R 5, capacitor C 2 and the diode D2 of B phase back electromotive force, the resistance R 3, resistance R 6, capacitor C 3 and the diode D3 that detect C phase back electromotive force form.The A phase of resistance R 1 one ends link motor M, an end connects resistance R 4, capacitor C 1 and diode D1, and the analog-to-digital conversion port AD0 of connection single-chip microcomputer 1, resistance R 4 and capacitor C 1 other end ground connection, diode D1 meets power supply VCC.The B phase of resistance R 2 one ends link motor M, an end connects resistance R 5, capacitor C 2 and diode D2, and the analog-to-digital conversion port AD1 of connection single-chip microcomputer 1, resistance R 5 and capacitor C 2 other end ground connection, diode D2 meets power supply VCC.The C phase of resistance R 3 one ends link motor M, an end connects resistance R 6, capacitor C 3 and diode D3, and the analog-to-digital conversion port AD2 of connection single-chip microcomputer 1, resistance R 6 and capacitor C 3 other end ground connection, diode D3 meets power supply VCC.

The driving voltage testing circuit is made up of resistance R 7, resistance R 8 and capacitor C 4.Resistance R 7 one termination driving voltage VDC, a terminating resistor R8, capacitor C 4, and the analog-to-digital conversion port AD3 of connection single-chip microcomputer 1; Resistance R 8, capacitor C 4 other end ground connection.

Counter electromotive force detection circuit adopts unified voltage ratio: R4/ (R1+R4)=R5/ (R2+R5)=R6/ (R3+R6); The driving voltage testing circuit, voltage ratio R8/ (R7+R8) is less than voltage ratio R4/ (R1+R4), R5/ (R2+R5), the R6/ (R3+R6) of electromotive force testing circuit;

The back electromotive force zero-crossing detection method of no sensing dc brushless motor: the magnitude of voltage that detects when counter electromotive force detection circuit equals the R4 that drive voltage circuit detects magnitude of voltage * (R7+R8)/(2 * R8 * (R1+R4)), or R5 * (R7+R8)/(2 * R8 * (R2+R5)), or R6 * (R7+R8)/(2 * R8 * (R3+R6)) time, determine back electromotive force zero-crossing, single-chip microcomputer 1 carries out commutation to be handled.

Claims (2)

  1. [claim 1] a kind of back electromotive force zero-crossing detection circuit that does not have the sensing dc brushless motor, comprise single-chip microcomputer (1), counter electromotive force detection circuit, the driving voltage testing circuit, it is characterized in that: described counter electromotive force detection circuit, by the resistance R 1, resistance R 4, capacitor C 1 and the diode D1 that detect A phase back electromotive force, detect resistance R 2, resistance R 5, capacitor C 2 and the diode D2 of B phase back electromotive force, the resistance R 3, resistance R 6, capacitor C 3 and the diode D3 that detect B phase back electromotive force form; Described driving voltage testing circuit is made up of resistance R 7, resistance R 8 and capacitor C 4; Described counter electromotive force detection circuit, voltage ratio R4/ (R1+R4)=R5/ (R2+R5)=R6/ (R3+R6); Described driving voltage testing circuit, voltage ratio R8/ (R7+R8) is less than voltage ratio R4/ (R1+R4), R5/ (R2+R5), the R6/ (R3+R6) of electromotive force testing circuit.
  2. The back electromotive force zero-crossing detection circuit of [claim 2] no sensing dc brushless motor as claimed in claim 1, it is characterized in that: the magnitude of voltage that detects when described counter electromotive force detection circuit equals the R4 that described drive voltage circuit detects magnitude of voltage * (R7+R8)/(2 * R8 * (R1+R4)), or R5 * (R7+R8)/(2 * R8 * (R2+R5)), or R6 * (R7+R8)/(2 * R8 * (R3+R6)) time, determine back electromotive force zero-crossing.
CNU2008203022676U 2008-09-27 2008-09-27 Opposing electromotive force zero crossing detection circuit of sensorless and brushless DC motor CN201307842Y (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CNU2008203022676U CN201307842Y (en) 2008-09-27 2008-09-27 Opposing electromotive force zero crossing detection circuit of sensorless and brushless DC motor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CNU2008203022676U CN201307842Y (en) 2008-09-27 2008-09-27 Opposing electromotive force zero crossing detection circuit of sensorless and brushless DC motor

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103018541A (en) * 2012-11-06 2013-04-03 中南林业科技大学 Counter-potential zero-crossing detection circuit and counter-potential zero-crossing detection method for brushless direct-current motor
CN106411187A (en) * 2015-08-03 2017-02-15 南京德朔实业有限公司 Electric tool and control method of brushless motor
CN108400729A (en) * 2018-05-11 2018-08-14 深圳市中科创想科技有限责任公司 A kind of three-phase brushless motor intelligent controller
CN109239635A (en) * 2018-09-30 2019-01-18 合肥巨动力系统有限公司 A kind of rotation of permanent magnet synchronous motor becomes Zero positioning system and scaling method

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103018541A (en) * 2012-11-06 2013-04-03 中南林业科技大学 Counter-potential zero-crossing detection circuit and counter-potential zero-crossing detection method for brushless direct-current motor
CN103018541B (en) * 2012-11-06 2016-05-11 中南林业科技大学 Brshless DC motor back-emf zero cross detection circuit and detection method
CN106411187A (en) * 2015-08-03 2017-02-15 南京德朔实业有限公司 Electric tool and control method of brushless motor
CN106411187B (en) * 2015-08-03 2019-02-01 南京德朔实业有限公司 The control method of electric tool and its brushless motor
CN108400729A (en) * 2018-05-11 2018-08-14 深圳市中科创想科技有限责任公司 A kind of three-phase brushless motor intelligent controller
CN109239635A (en) * 2018-09-30 2019-01-18 合肥巨动力系统有限公司 A kind of rotation of permanent magnet synchronous motor becomes Zero positioning system and scaling method

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C17 Cessation of patent right
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Granted publication date: 20090909

Termination date: 20100927