CN102195540B - Motor driving device - Google Patents

Abstract

A motor driving device comprises a main driving circuit, a detection control circuit and a backup driving circuit. The main driving circuit is provided with a plurality of driving current output ends which are coupled with a stator coil group of a motor; the detection control circuit is coupled with the main drive circuit; the backup driving circuit is coupled to the detection control circuit and also has driving current output terminals with the same number as the driving current output terminals of the main driving circuit, and the driving current output terminals of the backup driving circuit are respectively connected in parallel with the driving current output terminals of the main driving circuit.

Description

motor drive

technical field

The present invention relates to a motor drive device, in particular to a motor drive device with a main drive circuit and a backup drive circuit to control the rotation of a single motor.

Background technique

Motor technology plays a pivotal role in the development of today's automation technology. Especially when applied to fans, since the motor can drive the fan to rotate to induce airflow, and then achieve the purpose of driving wind and heat dissipation, it is quite suitable for heat dissipation of electronic products in the electronics industry.

As shown in FIG. 1 , it discloses a conventional motor driving device, which includes a control circuit 81 and a driving circuit 82 . The existing motor driving device is used to control a motor 83 to rotate. The control circuit 81 is coupled to the driving circuit 82 ; the driving circuit 82 is coupled to a stator coil of the motor 83 . In the operation of the above-mentioned motor drive device, the control circuit 81 outputs a control signal to the drive circuit 82, and the drive circuit 82 drives and controls the stator coil of the motor 83 to generate an alternating magnetic field, and is connected with a rotor of the motor 83. Magnet action creates rotation.

Please refer to Fig. 1 again, when the motor 83 is applied to a fan system, a rotor 831 of the motor 83 can be combined with an impeller 9, so that the motor drive device controls the rotation of the rotor 831 of a motor 83, which can simultaneously drive The impeller 9 rotates for heat dissipation of electronic products.

However, the existing motor drive device is connected in series with the control circuit 81 and the drive circuit 82, so as long as one of the control circuit 81 or the drive circuit 82 breaks down, the motor 83 cannot work normally. The above-mentioned conventional motor driving device will have the disadvantage of low reliability of circuit operation. Based on the above reasons, it is necessary to further improve the above-mentioned existing motor driving device.

Contents of the invention

The main purpose of the present invention is to provide a motor driving device which has the effect of improving the reliability of circuit operation.

According to the present invention, the motor driving device includes a main driving circuit, a detection control circuit and a backup driving circuit. The main driving circuit has several driving current output terminals, and the several driving current output terminals are used to couple to a stator coil group of a motor; the detection control circuit is coupled to the main driving circuit; the backup driving circuit is coupled to the detection control circuit, and the backup drive circuit also has the same number of drive current output terminals as the drive current output terminals of the main drive circuit, and several drive current output terminals of the backup drive circuit are respectively connected to the number of the main drive circuit. A drive current output terminal.

Description of drawings

Figure 1: A block diagram of a drive architecture of an existing motor drive device.

FIG. 2 is a schematic block diagram of the driving structure of the motor driving device according to the first embodiment of the present invention.

Fig. 3: A schematic diagram of the circuit connection of the motor drive device according to the first embodiment of the present invention.

Fig. 4: Schematic diagram of the circuit connection of the motor driving device according to the second embodiment of the present invention.

FIG. 5 : Schematic diagram of the circuit connection of the motor drive device according to the third embodiment of the present invention.

FIG. 6 : Schematic diagram of the circuit connection of the motor driving device of the fourth embodiment of the present invention.

FIG. 7 is a schematic block diagram of a driving structure of a motor driving device according to a fifth embodiment of the present invention.

FIG. 8 is a schematic block diagram of a driving structure of a motor driving device according to a sixth embodiment of the present invention.

Description of main component symbols

1 Motor drive device 11 Main drive circuit 111 Drive current output terminal

112 Drive component 113 Control component 1131 Rotation signal output terminal

114 Hall sensor 12 Detection control circuit 121 Microcontroller

1211 Signal detection terminal 1212 Control output terminal 122 Control switch

1221 Control terminal 1222 First connection terminal 1223 Second connection terminal

13 Backup drive circuit 131 Drive current output terminal 132 Drive components

133 Control component 134 Hall sensor 14 Protection diode

15 circuit board unit 16 circuit board unit 2 motors

21 Stator coil group 22 Rotor 3 Motor drive device

31 Main drive circuit 311 Drive current output terminal 312 Drive components

313 Hall sensor 3131 Rotation signal output terminal 32 Detection control circuit

321 Signal detection terminal 322 First control output terminal 323 Second control output terminal

33 Backup drive circuit 331 Drive current output terminal 332 Drive components

34 protection diodes 35 circuit board units 36 circuit board units

4 Motor drive device 41 Main drive circuit 42 Detection control circuit

43 backup drive circuit 5 motor 51 stator coil group

52 rotor 511 first coil 512 second coil

6 Motor drive device 61 Main drive circuit 62 Detection control circuit

63 backup drive circuit 7 motor 71 stator coil group

711 first coil 712 second coil 713 third coil

72 rotors 9 impellers VCC power supply

M1 electronic switch M2 electronic switch M3 electronic switch

M4 electronic switch M5 electronic switch M6 electronic switch

M7 electronic switch M8 electronic switch S1 electronic switch

S 2 electronic switch S3 electronic switch S4 electronic switch

S 5 electronic switch S6 electronic switch S7 electronic switch

S 8 electronic switch 81 control circuit 82 drive circuit

83 motor 831 rotor 9 impeller

Detailed ways

In order to make the above-mentioned and other objects, features and advantages of the present invention more comprehensible, the preferred embodiments of the present invention are specifically cited below, together with the accompanying drawings, as follows:

Please refer to FIG. 2 , which discloses a schematic circuit block diagram of a motor driving device 1 according to a first embodiment of the present invention. The motor driving device 1 is used to connect a motor 2 to drive the motor 2 to rotate. The motor driving device 1 includes a main driving circuit 11 , a detection control circuit 12 and a backup driving circuit 13 . The main driving circuit 11 has several driving current output terminals 111, and the several driving current output terminals 111 are used for coupling a certain stator coil group 21 of the motor 2; the main driving circuit 11 is further coupled to the detection control circuit 12; The detection control circuit 12 is coupled with the backup drive circuit 13; moreover, the backup drive circuit 13 also has several drive current output terminals 131, wherein the number of drive current output terminals 131 of the backup drive circuit 13 The same as the number of drive current output terminals 111 of the main drive circuit 11, and several drive current output terminals 131 of the backup drive circuit 13 are respectively connected in parallel to several drive current output terminals 111 of the main drive circuit 11; as shown in FIG. 2, the so-called parallel connection means that one of the two drive current output terminals 131 of the backup drive circuit 13 is connected to one of the two drive current output terminals 111 of the main drive circuit 11; The other driving current output terminal 131 of the backup driving circuit 13 is connected to the other driving current output terminal 111 of the main driving circuit 11 .

When the main driving circuit 11 of the first embodiment of the present invention is working normally, the operation of the main driving circuit 11 is used to drive and control the current flow direction of the stator coil group 21; at the same time, the main driving circuit 11 generates a rotation signal, and The rotation signal is input to the detection control circuit 12, and the detection control circuit 12 judges whether the main drive circuit 11 works normally according to the rotation signal, and if it is judged that the rotation signal is normal (for example, when the rotation signal is a periodic pulse signal, The detection control circuit 12 determines that the main drive circuit 11 is working normally), at this time, the detection control circuit 12 generates a shutdown signal to control the backup drive circuit 13 not to work.

However, when the main driving circuit 11 of the first embodiment of the present invention operates abnormally, the rotation signal generated by the main driving circuit 11 is judged to be abnormal by the detection control circuit 12 (for example, the rotation signal is a high-level DC signal or a low level signal, the detection control circuit 12 judges that the main drive circuit 11 is working abnormally), the detection control circuit 12 controls the backup drive circuit 13 to work at this time, so as to continuously drive the stator coil group 21 of the motor 2, Thus, the normal operation of the motor 2 is maintained.

In addition, the motor 2 has a rotor 22, which can be combined with the impeller 9 of the fan system. When the motor drive device 1 drives the rotor 22 of the motor 2 to rotate, the rotor 22 can simultaneously drive the impeller 9 to rotate. It is used to dispel wind and dissipate heat from electronic products.

Please refer to FIG. 3 , which discloses a schematic diagram of the circuit connection between the motor driving device 1 and the motor 2 according to the first embodiment of the present invention, wherein the motor 2 is a single-phase brushless DC motor.

Referring to FIG. 3 again, the main driving circuit 11 further includes a driving component 112 , a control component 113 and a Hall sensor 114 . The driving component 112 , the control component 113 and the Hall sensor 114 are coupled to a power VCC. The driving component 112 constitutes a bridge circuit. Further, the driving component 112 includes several electronic switches M1-M4, the two electronic switches M1 and M4 are connected in series, and the bridge circuit is connected in series. and the other two electronic switches M2 and M3 are also connected in series with each other, and its series connection is the other output end of the bridge circuit, and the two drive current output terminals 111 of the main drive circuit 11 are from the bridge The two output terminals of the formula circuit are drawn. Wherein, the above-mentioned driving component 112 and the control component 113 can be formed in a driving control IC. In addition, the Hall sensor 114 can also be optionally formed in the driving control IC.

The control component 113 has several control output terminals, and the several control output terminals are respectively connected to several electronic switches M1-M4 of the drive component 112. In addition, the control component 113 is connected to the Hall sensor 114, so, The control component 113 receives a Hall sensing signal generated by the Hall sensor 114, and the control component 113 generates a control signal corresponding to the Hall sensing signal, so as to respectively control the plurality of electronic switches M1-M4 opening and closing action. The control component 113 also has a rotation signal output terminal 1131, the rotation signal output terminal 1131 is coupled to the detection control circuit 12, wherein the rotation signal output terminal 1131 can be selected from a rotation speed signal pin (Frequency Generator, FG) or a motor Lock the warning signal pins (Rotation Detection, RD); in this way, the detection control circuit 12 can receive the rotation signals generated by these pins, so as to judge whether the main driving circuit 11 is working normally.

Please refer to FIG. 3 again, the detection control circuit 12 includes a controller 121 and a control switch 122 . The controller 121 has a signal detection terminal 1211 and a control output terminal 1212, the signal detection terminal 1211 of the controller 121 is connected to the rotation signal output terminal 1131 of the control component 113, and the control output terminal 1212 of the controller 121 is connected to the The control switch 122 is such that the controller 121 of the detection control circuit 12 is used to receive the rotation signal, and the controller 121 controls the control switch 122 to be turned on or off according to the received rotation signal. Wherein the controller 121 can be selected from a microcontroller (Micro Controller Unit) or a conversion circuit, and the conversion circuit can be composed of an analog circuit, such as an operational amplifier or a transistor driving a switch to form the conversion circuit.

More specifically, please refer to FIG. 3 again, the control switch 122 has a control terminal 1221 , a first connection terminal 1222 and a second connection terminal 1223 . The control terminal 1221 of the control switch 122 is connected to the control output terminal 1212 of the controller 121, and the first connection terminal 1222 and the second connection terminal 1223 of the control switch 122 are respectively coupled to the power supply VCC and one of the backup driving circuit 13. In this way, the power input terminal determines the operation of the backup drive circuit 13 by controlling the control switch 122 to be on or off. Wherein the control switch 122 can preferably be selected from a PMOS transistor switch (as shown in FIG. 3 ) or a relay.

In addition, please refer to FIG. 3 again, the backup driving circuit 13 further includes a driving component 132 , a control component 133 and a Hall sensor 134 . The driving component 132 , the control component 133 and the Hall sensor 134 are coupled to a power VCC through the control switch 122 . The drive assembly 132 constitutes a bridge circuit. In further words, the drive assembly 132 includes several electronic switches M5-M8. The two electronic switches M5 and M8 are connected in series, and the bridge circuit is connected in series. and the other two electronic switches M6 and M7 are also connected in series with each other, and its series connection is the other output end of the bridge circuit. The two output terminals of the formula circuit are drawn out, and the two driving current output terminals 131 of the backup driving circuit 13 are respectively connected in parallel with the two driving current output terminals 111 of the main driving circuit 11 . Wherein, the driving component 132 and the control component 133 of the above-mentioned backup driving circuit 13 can be formed in a driving control IC, and the Hall sensor 134 can also be optionally formed in the driving control IC.

Wherein the backup driving circuit 13 of the first embodiment of the present invention is also provided with the purpose of the Hall sensor 134: when the abnormal rotation of the motor 2 is caused by the Hall sensor 114 of the main driving circuit 11 When a failure occurs, the motor driving device 1 can continue to detect the rotor magnetic pole position of the motor 2 through the action of the Hall sensor 134 of the backup driving circuit 13 to maintain the normal operation of the motor 2 .

In other words, if the above-mentioned situation that the Hall sensor 114 of the main driving circuit 11 may fail, the Hall sensor 134 of the backup driving circuit 13 may also be omitted, and the backup driving circuit The control component 133 of 13 is connected to the Hall sensor 114 of the main driving circuit 11 , so that the circuit configuration cost of the backup driving circuit 13 can be reduced.

In the backup driving circuit 13 of the first embodiment of the present invention, according to the failure of the main driving circuit 11, the detection control circuit 12 decides whether to start the backup driving circuit 13, and the backup driving circuit 13 and the detection control The detailed operation of circuit 12 is further described as follows:

When the main drive circuit 11 of the first embodiment of the present invention works normally, the main drive circuit 11 generates the rotation signal, and the controller 121 of the detection control circuit 12 judges that the main drive circuit 11 is working normally according to the rotation signal (for example, the When the rotation signal sent by the controller 121 from the FG pin is a periodic pulse signal, the controller 121 judges that the main drive circuit 11 is working normally), and the controller 121 of the detection control circuit 12 controls the control switch at this time 122 forms an open circuit, because the power supply VCC is blocked by the control switch 122, so the power supply VCC cannot supply voltage to the drive component 132, control component 133 and Hall sensor 134 of the backup drive circuit 13, so the backup drive circuit 13 The auxiliary drive circuit 13 does not work in this case.

However, when the main driving circuit 11 of the first embodiment of the present invention operates abnormally, the rotation signal generated by the main driving circuit 11 is judged to be abnormal by the controller 121 of the detection control circuit 12 (for example, the controller 121 receives from the FG When the rotation signal sent by the foot position, and the controller 121 judges that the operating speed of the motor 2 does not match a predetermined control speed according to the rotation signal, the controller 121 judges that the main drive circuit 11 is working abnormally), the detection control circuit The controller 121 of 12 controls the control switch 122 to be turned on at this time, and the voltage of the power supply VCC is supplied to each circuit component of the backup drive circuit 13 through the control switch 122, so as to provide the backup drive circuit 13 to maintain the Power required for normal operation of motor 2.

In addition, please refer to FIG. 3 again, the motor drive device 1 further includes a protection diode 14, and the protection diode 14 is arranged in series between the main drive circuit 11 and the backup drive circuit 13; for example, in the main drive circuit A protection diode 14 is arranged between the power input end of 11 and the power input end of the backup driving circuit 13 . In this way, the function of the protection diode 14 is as follows: when the main drive circuit 11 is burned due to passing an abnormal current during operation, the abnormal current can be blocked by the protection diode 14 without burning the detection control circuit 12 and the A backup drive circuit 13.

Please refer to Figure 3 again, the motor drive device 1 further includes a circuit board unit 15, the circuit board unit 15 is a single circuit board, the main drive circuit 11, the detection control circuit 12, the backup drive circuit 13. The protection diode 14 and the additional peripheral circuits of the motor drive device 1 can be disposed together on the single circuit board, so that the above-mentioned circuit components can implement circuit wiring operations thereon.

Please refer to FIG. 4 , which discloses the motor drive device 1 of the second embodiment of the present invention. Compared with the first embodiment, the circuit board unit 16 of the motor drive device 1 includes two circuit boards. The circuit board unit One of the circuit boards of 16 is at least provided with the main drive circuit 11, and the other circuit board of the circuit board unit 16 is provided with the backup drive circuit 13 at least. In addition, the detection control circuit 12 and the protection diode 14 can be Choose to be arranged on one of the two circuit boards, and the detection control circuit 12 is preferably arranged on the same circuit board as the backup drive circuit 13, so that when the main drive circuit 11 fails, as long as the The circuit board on which the main driving circuit 11 is installed can be replaced, and this arrangement will improve the convenience of checking and replacing the circuit components of the motor driving device 1 .

Please refer to FIG. 5 , which discloses a motor driving device 3 according to a third embodiment of the present invention. The motor driving device 3 includes a main driving circuit 31 , a detection control circuit 32 and a backup driving circuit 33 . The main driving circuit 31 has several driving current output terminals 311, and the several driving current output terminals 311 are used for coupling the stator coil group 21 of the motor 2; the main driving circuit 31 is also coupled to the detection control circuit 32; the detection The control circuit 32 is coupled with the backup drive circuit 33; moreover, the backup drive circuit 33 also has several drive current output terminals 331, wherein the number of drive current output terminals 331 of the backup drive circuit 33 is the same as The number of driving current output terminals 311 of the main driving circuit 31 is the same, and the driving current output terminals 331 of the backup driving circuit 33 are respectively connected in parallel to the driving current output terminals 311 of the main driving circuit 31 .

Please refer to FIG. 5 again, which shows a schematic diagram of the detailed circuit connection between the motor driving device 3 and the motor 2 according to the third embodiment of the present invention when it is a single-phase brushless DC motor. Compared with the first embodiment and the second embodiment of the present invention, the main driving circuit 31 of the third embodiment omits the setting of the control component, and only includes a driving component 312 and a Hall sensor 313, the The driving component 312 and the Hall sensor 313 are coupled to the power VCC. The driving component 312 constitutes a bridge circuit. Further, the driving component 312 includes several electronic switches S1-S4. The two electronic switches S1 and S4 are connected in series, and the bridge circuit is connected in series. and the other two electronic switches S2 and S3 are also connected in series with each other, and its series connection is the other output end of the bridge circuit. The two output terminals of the circuit are drawn out.

Please refer to FIG. 5 again, the Hall sensor 313 of the third embodiment of the present invention has at least one rotation signal output end 3131, and the at least one rotation signal output end 3131 is connected to the detection control circuit 32, so that the detection control The circuit 32 can receive a Hall sensing signal generated by the Hall sensor 313, wherein in the third embodiment, the Hall sensing signal is regarded as the rotation signal, and the detection control circuit 32 can receive the Hall sensing signal. Er senses the signal, and judges whether the main driving circuit 31 works normally according to it.

Please refer to FIG. 5 again, the detection control circuit 32 is a microcontroller, which has functions of signal reception, output and calculation (including judgment). Compared with the first embodiment and the second embodiment of the present invention, the detection control circuit 32 of the third embodiment integrates the operations of the two control components 113, 133 and the control switch 122, so that the motor drive device 3 can be reduced. Circuit setup volume and cost.

The detection control circuit 32 has a signal detection terminal 321 , a plurality of first control output terminals 322 and a plurality of second control output terminals 323 . The signal detection terminal 321 of the detection control circuit 32 is connected to the rotation signal output terminal 3131 of the Hall sensor 313, and the several first control output terminals 322 are respectively connected to several electronic switches S1-S4 of the driving component 312, So that the detection control circuit 32 can control the opening and closing actions of the electronic switches S1 - S4 of the driving component 312 . Several second control output terminals 323 of the detection control circuit are coupled to the backup driving circuit 33 .

Furthermore, the backup driving circuit 33 further includes a driving component 332 . The driving component 332 is coupled to the power VCC. The driving component 332 constitutes a bridge circuit, and the driving component 332 also includes several electronic switches S5-S8, the two electronic switches S5 and S8 are connected in series with each other, and the connection in series is an output end of the bridge circuit and the other two electronic switches S6 and S7 are also connected in series with each other, and its series connection is the other output end of the bridge circuit, and the two drive current output ends 331 of the backup drive circuit 33 are from the two outputs of the bridge circuit. output terminal. Several second control output terminals 323 of the detection control circuit 32 are respectively connected to several electronic switches S5-S8 of the drive assembly 332, so that the detection control circuit 32 can control several electronic switches S5-S8 of the drive assembly 332. The opening and closing action of S8.

In this way, when the detection control circuit 32 receives the Hall sensing signal and determines that the Hall sensing signal is a normal rotation signal, the detection control circuit 32 controls the backup driving circuit 33 not to work. Conversely, when the detection control circuit 32 judges that the received Hall sensing signal is an abnormal rotation signal, the detection control circuit 32 timely controls the backup driving circuit 33 to work, thereby maintaining the normal operation of the motor 2 .

In addition, please refer to FIG. 5 again, the motor drive device 3 further includes a protection diode 34, and the protection diode 34 is arranged in series between the main drive circuit 31 and the backup drive circuit 33; for example, in the main drive circuit The protection diode 34 is provided between the power input end of the drive circuit 31 and the power input end of the backup drive circuit 33 .

Please refer to Fig. 5 again, the motor drive device 3 further includes a circuit board unit 35, the circuit board unit 35 is a single circuit board, the main drive circuit 31, the detection control circuit 32, the backup drive circuit 33. The protection diode 34 and the additional peripheral circuits of the motor drive device 3 can be jointly arranged on the single circuit board, so that the above-mentioned circuit components can implement circuit wiring operations thereon.

Please refer to FIG. 6 , which discloses the motor drive device 3 of the fourth embodiment of the present invention. Compared with the third embodiment, the circuit board unit 36 of the motor drive device 3 includes two circuit board sheets, and the circuit board unit One of the circuit boards of 36 is provided with the main drive circuit 31 at least, and the other circuit board of the circuit board unit 36 is provided with the backup drive circuit 33 at least. In addition, the detection control circuit 32 and the protection diode 14 can be Choose to be arranged on one of the two circuit boards, and the detection control circuit 32 is preferably arranged on the same circuit board as the backup drive circuit 33, so that when the main drive circuit 31 fails, as long as the The circuit board on which the main driving circuit 31 is installed can be replaced, and this arrangement will improve the convenience of checking and replacing the circuit components of the motor driving device 3 .

Please refer to FIG. 7 , which discloses a motor driving device 4 according to a fifth embodiment of the present invention. The motor driving device 4 is electrically connected to a motor 5, wherein the motor 5 is a two-phase brushless DC motor, the motor 5 has a stator coil set 51, and the stator coil set 51 includes a first coil 511 and a second coil 512 . Compared with the above-mentioned embodiments of the single-phase brushless DC motor, a main drive circuit 41 and a backup drive circuit 43 of the motor drive device 4 are respectively designed as a two-phase bridge circuit in conjunction with the two-phase brushless DC motor When the main drive circuit 41 of the present invention fails, the backup drive circuit 43 can replace the main drive circuit 41 to drive the motor 5 and maintain the motor 5 through simple circuit changes of the above-mentioned bridge circuit. purpose of continuing work.

The detailed circuit connection structure between the main driving circuit 41, the backup driving circuit 43 and a detection control circuit 42 of the fifth embodiment of the present invention, and the configuration of the circuit board unit can also be implemented in conjunction with the circuit structure of the dual-phase bridge circuit. The operation modes of the first embodiment to the fourth embodiment of the invention will not be repeated here.

In addition, the motor 5 has a rotor 52 which can be combined with the impeller 9 of the fan system to drive wind and dissipate heat from the heating element.

Please refer to FIG. 8 , which discloses a motor driving device 6 according to a sixth embodiment of the present invention. The motor driving device 6 is electrically connected to a motor 7, wherein the motor 7 is a three-phase brushless DC motor, the motor 7 has a stator coil set 71, and the stator coil set 71 includes a first coil 711, a second coil 712 and a third coil 713. Compared with the above-mentioned embodiments, a main drive circuit 61 and a backup drive circuit 63 of the motor drive device 6 cooperate with the three-phase brushless DC motor and are respectively designed as a three-phase bridge circuit. The circuit changes can also achieve the purpose of the present invention that when the main drive circuit 61 fails, the backup drive circuit 63 can replace the main drive circuit 61 to drive the motor 7 and keep the motor 7 working continuously.

The detailed circuit connection structure between the main driving circuit 61, the backup driving circuit 63 and a detection control circuit 62 of the sixth embodiment of the present invention, and the configuration of the circuit board unit can also be implemented in conjunction with the circuit structure of the three-phase bridge circuit. The operation modes of the first embodiment to the fourth embodiment of the invention will not be repeated here.

In addition, the motor 7 has a rotor 72 that can be combined with the impeller 9 of the fan system to drive wind and dissipate heat from the heating element.

In summary, the present invention uses the detection control circuit to control the backup drive circuit to start immediately when the main drive circuit fails, so as to maintain the continuous operation of the motor drive device of the present invention, and the present invention can indeed achieve the purpose of improving the reliability of circuit operation effect.

Claims (15)

1. A motor drive, characterized in that it comprises: A main driving circuit has several driving current output terminals, a driving component, a control component and a Hall sensor, and the several driving current output terminals are used for coupling a stator coil group of a motor. The driving component, the The control component and the Hall sensor are coupled to a power supply, the drive component is a bridge circuit with several electronic switches, and several drive current output terminals of the main drive circuit are obtained from several The output terminal is drawn out, the control component has several control output terminals respectively connected to several electronic switches of the drive component, and the Hall sensor is connected to the control component; A detection control circuit, coupled to the main drive circuit, the detection control circuit includes a controller and a control switch, the controller has a signal detection terminal and a control output terminal, the signal detection terminal of the controller is connected to the control component A rotation signal output end of the control switch has a control end, a first connection end and a second connection end, the control end of the control switch is connected to the control output end of the controller, and the first connection end of the control switch is coupled to the power source; and A backup driving circuit, coupled to the second connection end of the control switch of the detection control circuit, and the backup driving circuit also has the same number of driving current output terminals as the driving current output terminals of the main driving circuit, and the Several drive current output terminals of the backup drive circuit are respectively connected to several drive current output terminals of the main drive circuit; Wherein, when the main driving circuit works normally, the main driving circuit generates a rotation signal, and the rotation signal is input into the detection control circuit through the rotation signal output terminal, if the detection control circuit judges that the rotation signal is normal, the The detection control circuit generates a closing signal to control the control switch to form an open circuit so that the backup drive circuit does not work. If the detection control circuit judges that the rotation signal is abnormal, the detection control circuit controls the control switch to form a conduction , so that the backup drive circuit works. 2. The motor driving device according to claim 1, wherein the control unit of the main driving circuit and the driving unit are formed in a driving control integrated circuit. 3 . The motor driving device according to claim 2 , wherein the Hall sensor of the main driving circuit is also formed in the driving control integrated circuit together with the control component of the main driving circuit and the driving component. 4. The motor driving device according to claim 1, wherein the control switch is a PMOS transistor switch or a relay. 5. The motor drive device according to claim 1 or 4, wherein the backup drive circuit further comprises a drive component, a control component and a Hall sensor, and the drive component of the backup drive circuit is A bridge circuit with several electronic switches, several drive current output terminals of the backup drive circuit are drawn from several output terminals of the bridge circuit of the backup drive circuit, the control component of the backup drive circuit has Several control output ends, the several control output ends of the control component of the backup drive circuit are respectively connected to several electronic switches of the drive component of the backup drive circuit, the Hall sensor of the backup drive circuit is connected to the A control component for a redundant drive circuit. 6. The motor driving device according to claim 1, 2, 3 or 4, further comprising a protection diode, the protection diode is arranged in series between the main driving circuit and the backup driving circuit. 7. The motor driving device according to claim 5, further comprising a protection diode, the protection diode is arranged in series between the main driving circuit and the backup driving circuit. 8 . The motor driving device according to claim 5 , wherein the control unit and the driving unit of the backup driving circuit are jointly formed in a driving control integrated circuit. 9. The motor driving device according to claim 8, wherein the Hall sensor of the backup drive circuit is also formed in the drive control integrated circuit together with the control component and the drive component of the backup drive circuit . 10. The motor drive device according to claim 6, further comprising a circuit board unit, the circuit board unit is a single circuit board, the main drive circuit, the detection control circuit, the backup drive circuit and the protection diode are jointly arranged on the single circuit board. 11. The motor drive device according to claim 7, further comprising a circuit board unit, the circuit board unit is a single circuit board, the main drive circuit, the detection control circuit, the backup drive circuit and the protection diode are jointly arranged on the single circuit board. 12. The motor driving device according to claim 6, further comprising a circuit board unit, the circuit board unit includes two circuit boards, one of the circuit boards of the circuit board unit is provided with at least the main circuit board For the driving circuit, the other circuit board of the circuit board unit is provided with at least the backup driving circuit, and the detection control circuit and the protection diode are arranged on one of the two circuit boards. 13 . The motor driving device according to claim 12 , wherein the detection control circuit and the backup driving circuit are disposed on the same circuit board. 14 . 14. The motor driving device according to claim 7, further comprising a circuit board unit, the circuit board unit includes two circuit boards, one of the circuit boards of the circuit board unit is provided with at least the main circuit board For the driving circuit, the other circuit board of the circuit board unit is provided with at least the backup driving circuit, and the detection control circuit and the protection diode are arranged on one of the two circuit boards. 15 . The motor driving device according to claim 14 , wherein the detection control circuit and the backup driving circuit are disposed on the same circuit board.

Images