TWI483538B - Motor driving circuit - Google Patents

Description

Motor drive

The present invention relates to a motor driving device, and more particularly to a motor driving device having a main driving circuit and a backup driving circuit for controlling the rotation of a single motor.

Motor technology plays a pivotal role in the development of today's automation technology. In particular, it is applied to a fan, and since the motor can drive the fan to rotate and illuminate the airflow, thereby achieving the purpose of dissipating heat and dissipating heat, it is quite suitable for a heat sink for electronic products in the electronics industry.

As shown in FIG. 1, a conventional motor driving device is disclosed. The motor driving device includes a control circuit 81 and a driving circuit 82. The conventional motor drive unit controls a motor 83 for rotation. The control circuit 81 is coupled to the drive circuit 82; the drive circuit 82 is coupled to one of the stator coils of the motor 83. In the operation of the motor driving device, the control circuit 81 outputs a control signal to the driving circuit 82, and causes the driving circuit 82 to drive and control the stator coil of the motor 83 to generate an alternating magnetic field, and a rotor of the motor 83. The action of the magnet produces a rotation.

Referring to FIG. 1 again, when the motor 83 is applied to a fan system, one of the rotors 831 of the motor 83 can be combined with an impeller 9 so that the motor driving device controls the rotation of the rotor 831 of a motor 83. At the same time, the impeller 9 is rotated to perform heat dissipation operation of the electronic product.

However, the conventional motor driving device is connected in series with the control circuit 81 and the driving circuit 82. Therefore, when one of the control circuit 81 or the driving circuit 82 fails, the motor 83 cannot operate normally. The above conventional motor driving device will have the disadvantage of low circuit operation reliability. For the above reasons, it is necessary to further improve the above-described conventional motor driving device.

SUMMARY OF THE INVENTION A primary object of the present invention is to provide a motor drive device that has the effect of improving circuit operation reliability.

The motor driving device according to the present invention comprises a main driving circuit, a detecting control circuit and a backup driving circuit. The main driving circuit has a plurality of driving current output ends, wherein the plurality of driving current output ends are coupled to a stator coil group of a motor; the detecting control circuit is coupled to the main driving circuit; the backup driving circuit is coupled to the Detecting a control circuit, and the backup driving circuit also has a plurality of driving current output ends that are the same as the driving current output ends of the main driving circuit, and the plurality of driving current output ends of the backup driving circuit are respectively connected in parallel a plurality of driving current output ends of the main driving circuit; wherein the main driving circuit generates a rotation signal, and inputs the rotation signal to the detection control circuit, and if the detection control circuit determines that the rotation signal is normal, the detection The detection control circuit generates a shutdown signal to control the backup drive circuit to be unactuated. If the detection control circuit determines that the rotation signal is abnormal, the detection control circuit controls the backup drive circuit to operate.

The above and other objects, features and advantages of the present invention will become more <RTIgt;

Referring to FIG. 2, a circuit block diagram of a motor driving device 1 according to a first embodiment of the present invention is disclosed. 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 detecting control circuit 12 and a backup driving circuit 13. The main drive circuit 11 has a plurality of drive current output terminals 111, the plurality of drive current output terminals 111 are coupled to the stator coil assembly 21 of the motor 2; the main drive circuit 11 is coupled to the detection control circuit 12; The detection control circuit 12 is coupled to the backup drive circuit 13; and the backup drive circuit 13 also has a plurality of drive current output terminals 131, wherein the backup drive circuit 13 has a plurality of drive current outputs. The number of the terminals 131 is the same as the number of the plurality of driving current output terminals 111 of the main driving circuit 11, and the plurality of driving current output terminals 131 of the backup driving circuit 13 are respectively connected to the driving currents of the main driving circuit 11 in parallel. The output terminal 111; as shown in FIG. 2, the so-called parallel connection, that is, one of the two drive current output terminals 131 of the backup drive circuit 13 is connected to the two drive current output terminals 111 of the main drive circuit 11. One of the driving current output terminals 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 operates normally, the main driving circuit 11 operates to control the current flow of the stator coil group 21; meanwhile, the main driving circuit 11 generates a rotation signal. And the rotation control signal is input to the detection control circuit 12, and the detection control circuit 12 determines whether the main drive circuit 11 is normally operated according to the rotation signal, and if the rotation signal is normal, for example, the rotation signal is a periodic pulse wave. When the signal is received, the detection control circuit 12 determines that the main driving circuit 11 is Normal operation), at this time, the detection control circuit 12 generates a shutdown signal to control the backup drive circuit 13 not to operate.

However, when the main driving circuit 11 of the first embodiment of the present invention is abnormal in operation, the rotation signal generated by the main driving circuit 11 is determined to be abnormal by the detecting control circuit 12 (for example, the rotation signal is a high-level DC signal or When the low level signal is low, the detection control circuit 12 determines that the main driving circuit 11 is abnormally operating. The detection control circuit 12 controls the backup driving circuit 13 to operate to continuously drive the stator coil of the motor 2. Group 21, in turn, maintains normal operation of the motor 2.

In addition, the motor 2 has a rotor 22 which can be combined with the impeller 9 of the fan system. When the motor driving device 1 drives the rotor 22 of the motor 2 to rotate, the rotor 22 can simultaneously drive the impeller 9 to rotate. As a way to drive the heat of electronic products.

Referring to FIG. 3, it is a schematic diagram showing 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 source VCC. The driving component 112 constitutes a bridge circuit. Further, the driving component 112 includes a plurality of electronic switches M1 M M4. The two electronic switches M1 and M4 are connected in series with each other, and the series connection is the bridge type. One of the output ends of the circuit; and the other two electronic switches M2, M3 are also connected in series with each other, and the series connection is the other output end of the bridge circuit, and the driving current output end of the main driving circuit 11 The 111 series is taken from the two outputs of the bridge circuit. The driving component 112 and the control component 113 can be formed in a driving control IC. Alternatively, the Hall sensor 114 can be selectively formed in the driving control IC.

The control component 113 has a plurality of control outputs respectively connected to the plurality of electronic switches M1 M M4 of the driving component 112. In addition, the control component 113 is connected to the Hall sensor 114. 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 to respectively control the plurality of electronic switches M1~ The opening and closing action of M4. The control component 113 further has a rotation signal output end 1131, and the rotation signal output end 1131 is coupled to the detection control circuit 12, wherein the rotation signal output end 1131 can be selected from a speed signal pin (Frequency Generator, FG). Or a motor lockout signal pin (Rotation Detection, RD); thus, the detection control circuit 12 can receive the rotation signals generated by the pins to determine whether the main drive circuit 11 is operating normally.

Referring to FIG. 3 again, the detection control circuit 12 includes a controller 121 and a control switch 122. The controller 121 has a signal detecting end 1211 and a control output end 1212. The signal detecting end 1211 of the controller 121 is connected to the rotating signal output end 1131 of the control component 113, and the control output end of the controller 121 The control switch 122 is configured to receive the rotation signal. The controller 121 controls the control switch 122 to be turned on or off according to the received rotation signal. Wherein the controller 121 It may be selected from a Micro Controller Unit or a conversion loop, which may be composed of an analog circuit, such as an operational amplifier or a transistor driven switch.

More specifically, please refer to FIG. 3 again, the control switch 122 has a control end 1221, a first connection end 1222 and a second connection end 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 end 1222 and the second connection end 1223 of the control switch 122 are respectively coupled to the power source VCC and the backup drive circuit 13 respectively. The power supply terminal is controlled to control the operation of the backup drive circuit 13 by controlling the conduction or disconnection of the control switch 122. The control switch 122 is preferably selected from a PMOS transistor switch (as shown in FIG. 3) or a relay.

In addition, referring to FIG. 3 , 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 source VCC through the control switch 122. The driving component 132 is configured as a bridge circuit. Further, the driving component 132 includes a plurality of electronic switches M5 to M8. The two electronic switches M5 and M8 are connected in series, and the series connection is the bridge type. One of the output ends of the circuit; and the other two electronic switches M6, M7 are also connected in series with each other, and the series connection is the other output end of the bridge circuit, and the second drive current output terminal 131 of the backup drive circuit 13 The two output terminals of the bridge circuit are led out, and the two drive current output terminals 131 of the backup drive circuit 13 are respectively connected in parallel to the two drive current output terminals 111 of the main drive circuit 11. The driving component 132 of the backup driving circuit 13 and the The control component 133 can be formed in a drive control IC. Alternatively, the Hall sensor 134 can be selectively formed in the drive control IC.

The backup driver circuit 13 of the first embodiment of the present invention is also provided with the Hall sensor 134. The reason for the abnormal rotation of the motor 2 is the Hall sensor 114 of the main drive circuit 11. When the fault occurs, the motor driving device 1 can continue to detect the rotor magnetic pole position of the motor 2 by 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-described failure of the Hall sensor 114 of the main driving circuit 11 may be considered, the Hall sensor 134 for setting the backup driving circuit 13 may be omitted, and the backup driving circuit may be omitted. The control unit 133 of 13 is connected to the Hall sensor 114 of the main drive circuit 11, so that the circuit installation cost of the backup drive circuit 13 can be reduced.

The backup drive circuit 13 of the first embodiment of the present invention determines whether or not the backup drive circuit 13 is activated by the detection control circuit 12 due to the failure of the main drive circuit 11, and the backup drive circuit 13 The detailed operation of the detection control circuit 12 is further illustrated as follows:

When the main driving circuit 11 of the first embodiment of the present invention operates normally, the main driving circuit 11 generates the rotation signal, and the controller 121 of the detecting control circuit 12 determines that the main driving circuit 11 is normally operated according to the rotation signal ( For example, when the controller 121 receives the rotation signal sent from the FG pin as a periodic pulse wave signal, the controller 121 determines that the main drive circuit 11 is in normal operation, and the controller 121 of the detection control circuit 12 controls at this time. The control switch 122 forms an open circuit. Since the power supply VCC is blocked by the control switch 122, the power supply VCC cannot supply a voltage to the The drive unit 132, the control unit 133, and the Hall sensor 134 of the drive circuit 13 are multiplexed so that the backup drive circuit 13 does not operate in this case.

However, when the main driving circuit 11 of the first embodiment of the present invention is abnormal in operation, the rotation signal generated by the main driving circuit 11 is determined to be abnormal by the controller 121 of the detecting control circuit 12 (for example, the controller 121 receives the self. The rotation signal sent by the FG pin, and the controller 121 determines that the operating speed of the motor 2 does not match a predetermined control speed according to the rotation signal, the controller 121 determines that the main driving circuit 11 is abnormally operating, and the detecting The controller 121 of the control circuit 12 controls the control switch 122 to be turned on at this time, and the voltage of the power source VCC is supplied to the circuit components of the backup drive circuit 13 through the control switch 122 to provide the backup drive circuit 13 for maintenance. The power required for normal operation of the motor 2.

In addition, as shown in FIG. 3, the motor driving device 1 further includes a protection diode 14 which is disposed in series between the main driving circuit 11 and the backup driving circuit 13; For example, a protective diode 14 is disposed between the power supply terminal of the main driving circuit 11 and the power supply terminal of the backup driving circuit 13. Thus, the function of the protection diode 14 is as follows: when the main driving circuit 11 is burned by an abnormal current during operation, the abnormal current can be prevented from being burned by the barrier of the protection diode 14 The detection control circuit 12 and the backup drive circuit 13 are detected.

Referring to FIG. 3 again, the motor driving device 1 further includes a circuit board unit 15 which is a single circuit board, the main driving circuit 11, the detection control circuit 12 and the device. Auxiliary drive The circuit 13, the protective diode 14, and the additional peripheral circuits of the motor driving device 1 can be collectively disposed on the single circuit board so that the circuit members can perform circuit wiring operations thereon.

Referring to FIG. 4, a motor driving device 1 according to a second embodiment of the present invention is disclosed. Compared with the first embodiment, the circuit board unit 16 of the motor driving device 1 includes two circuit boards. The circuit board of the board unit 16 is provided with at least the main driving circuit 11, and the other circuit board of the circuit board unit 16 is provided with at least the backup driving circuit 13. In addition, the detection control circuit 12 and the protection The diode 14 can be disposed on one of the two circuit boards, and the detection control circuit 12 is preferably disposed on the same circuit board together with the backup driving circuit 13, so that when the main When the drive circuit 11 fails, the circuit board provided with the main drive circuit 11 can be replaced, and this arrangement can improve the convenience of the circuit component of the motor drive device 1 when it is replaced.

Referring to FIG. 5, a motor driving device 3 according to a third embodiment of the present invention is disclosed. The motor driving device 3 includes a main driving circuit 31, a detecting control circuit 32 and a backup driving circuit 33. The main drive circuit 31 has a plurality of drive current output terminals 311, and the plurality of drive current output terminals 311 are coupled to the stator coil assembly 21 of the motor 2; the main drive circuit 31 is coupled to the detection control circuit 32; The detection control circuit 32 is coupled to the backup drive circuit 33. The backup drive circuit 33 also has a plurality of drive current output terminals 331, wherein the drive drive circuit 33 has a plurality of drive current outputs. The number of 331 is the same as the number of the plurality of driving current output terminals 311 of the main driving circuit 31, and the plurality of driving current output terminals 331 of the backup driving circuit 33 are respectively connected in parallel to the main driving power. A plurality of drive current output terminals 311 of the path 31.

Referring to FIG. 5 again, it is a schematic diagram showing a detailed circuit connection when the motor driving device 3 of the third embodiment of the present invention and the motor 2 are 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 driving component 312 and the Hall sensor 313 are coupled to the power source VCC. The driving component 312 constitutes a bridge circuit. Further, the driving component 312 includes a plurality of electronic switches S1 S S4. The two electronic switches S1 and S4 are connected in series with each other, and the series connection is the bridge type. One of the output ends of the circuit; the other two electronic switches S2, S3 are also connected in series with each other, and the series connection is the other output end of the bridge circuit, and the driving current output terminal 311 of the main driving circuit 31 is Leading from the two outputs of the bridge circuit.

Referring 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. The detection control 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 The circuit 32 can receive the Hall sensing signal and determine whether the main driving circuit 31 is operating normally.

Referring to FIG. 5 again, the detection control circuit 32 is a microcontroller having functions of signal reception, output, and operation (including judgment). Compared with the first embodiment and the second embodiment of the present invention, the detection control circuit 32 of the third embodiment is the second control component 113, 133 and the control The operation of the switch 122 is integrated, which reduces the circuit setup volume and cost of the motor drive unit 3.

The detection control circuit 32 has a signal detection terminal 321, a plurality of first control outputs 322 and a plurality of second control outputs 323. The signal detecting end 321 of the detecting control circuit 32 is connected to the rotating signal output end 3131 of the Hall sensor 313, and the plurality of first control output ends 322 are respectively connected to the plurality of electronic switches S1 of the driving component 312. ~S4, so that the detection control circuit 32 can control the opening and closing operations of the plurality of electronic switches S1 to S4 of the driving component 312. The plurality of second control outputs 323 of the detection control circuit are coupled to the backup drive circuit 33.

Furthermore, the backup drive circuit 33 further includes a drive assembly 332. The driving component 332 is coupled to the power source VCC. The driving component 332 is a bridge circuit, and the driving component 332 also includes a plurality of electronic switches S5~S8. The two electronic switches S5 and S8 are connected in series with each other, and the series connection is one output of the bridge circuit. The other two electronic switches S6 and S7 are also connected in series with each other, and the series connection is the other output end of the bridge circuit, and the second driving current output terminal 331 of the backup driving circuit 33 is from the bridge. The two outputs of the circuit are taken out. The plurality of second control outputs 323 of the detection control circuit 32 are respectively connected to the plurality of electronic switches S5 S S8 of the driving component 332, so that the detection control circuit 32 can control the plurality of electronic components of the driving component 332. The opening and closing action of the switch S5~S8.

In this manner, 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 operate. On the contrary, in the When the detection control circuit 32 determines that the received Hall sensing signal is an abnormal rotation signal, the detection control circuit 32 controls the backup driving circuit 33 to operate in time to maintain the normal operation of the motor 2.

In addition, as shown in FIG. 5, the motor driving device 3 further includes a protection diode 34, and the protection diode 34 is disposed in series between the main driving circuit 31 and the backup driving circuit 33; The protective diode 34 is disposed, for example, between the power supply terminal of the main drive circuit 31 and the power supply terminal of the backup drive circuit 33.

Referring to FIG. 5 again, the motor driving device 3 further includes a circuit board unit 35. The circuit board unit 35 is a single circuit board. The main driving circuit 31, the detecting control circuit 32, and the device The auxiliary driving circuit 33, the protective diode 34, and the additional peripheral circuits of the motor driving device 3 may be collectively disposed on the single circuit board so that the circuit members can perform circuit wiring operations thereon.

Referring to FIG. 6, a motor driving device 3 according to a fourth embodiment of the present invention is disclosed. Compared with the third embodiment, the circuit board unit 36 of the motor driving device 3 includes two circuit boards. The circuit board of the board unit 36 is provided with at least the main driving circuit 31. The other circuit board of the circuit board unit 36 is provided with at least the backup driving circuit 33. In addition, the detecting control circuit 32 and the protection are provided. The diode 14 can be optionally disposed on one of the two circuit boards, and the detection control circuit 32 is preferably disposed on the same circuit board together with the backup driving circuit 33, so that when the main When the drive circuit 31 fails, the circuit board provided with the main drive circuit 31 can be replaced, and this arrangement can improve the convenience of the circuit component of the motor drive device 3 when it is replaced.

Referring to Fig. 7, there is disclosed a motor driving device 4 of 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 certain sub-coil group 51, and the stator coil group 51 includes a first coil 511 and a first Two coils 512. Compared with the embodiments of the single-phase brushless DC motor, the main driving circuit 41 and the backup driving circuit 43 of the motor driving device 4 are respectively designed as a two-phase bridge type according to the two-phase brushless DC motor. The circuit can also achieve the present invention by a simple circuit change of the bridge circuit. When the main drive circuit 41 is faulty, the backup drive circuit 43 can replace the main drive circuit 41 to perform the drive operation of the motor 5, and maintain the The motor 5 continues to operate.

The detailed circuit connection structure between the main driving circuit 41 and the backup driving circuit 43 and the detecting control circuit 42 of the fifth embodiment of the present invention, and the configuration of the circuit board unit can also be implemented with the circuit architecture of the dual-phase bridge circuit. The operation modes of the first to fourth embodiments of the present invention are not described herein.

In addition, the motor 5 has a rotor 52 that can be coupled to the impeller 9 of the fan system for heat dissipation of the heating element.

Referring to Fig. 8, there is disclosed a motor driving device 6 of 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 certain sub-coil group 71, and the stator coil group 71 includes a first coil 711, a first Two coils 712 and a third coil 713. Compared with the above embodiments, the main driving circuit 61 of the motor driving device 6 and a backup driving circuit The road 63 is designed as a three-phase bridge circuit in combination with the three-phase brushless DC motor, and the circuit of the above-mentioned bridge circuit can also achieve the same in the fault of the main drive circuit 61 of the present invention. 63 can replace the main drive circuit 61 to perform the driving operation of the motor 7, while maintaining the purpose of the motor 7 continuing to operate.

The detailed circuit connection structure between the main driving circuit 61 and the backup driving circuit 63 and the detecting control circuit 62 of the sixth embodiment of the present invention, and the configuration of the circuit board unit can also be implemented with the circuit architecture of the three-phase bridge circuit. The operation modes of the first to fourth embodiments of the present invention are not described herein.

In addition, the motor 7 has a rotor 72 that can be coupled to the impeller 9 of the fan system for heat dissipation of the heating element.

In summary, the present invention controls the backup drive circuit to be activated immediately when the main drive circuit is faulty by the detection control circuit to maintain the continuous operation of the motor drive device of the present invention, and the present invention can achieve improved circuit operation reliability. The effect of the degree.

While the invention has been described in connection with the preferred embodiments described above, it is not intended to limit the scope of the invention. The technical scope of the invention is protected, and therefore the scope of the invention is defined by the scope of the appended claims.

〔this invention〕

1‧‧‧Motor drive

11‧‧‧Main drive circuit

111‧‧‧Drive current output

112‧‧‧Drive components

113‧‧‧Control components

1131‧‧‧Rotary signal output

114‧‧‧ Hall sensor

12‧‧‧Detection Control Circuit

121‧‧‧Microcontroller

1211‧‧‧Signal detection end

1212‧‧‧Control output

122‧‧‧Control switch

1221‧‧‧Control terminal

1222‧‧‧ first connection

1223‧‧‧second connection

13‧‧‧Reservation drive circuit

131‧‧‧Drive current output

132‧‧‧Drive components

133‧‧‧Control components

134‧‧‧ Hall sensor

14‧‧‧Protection diode

15‧‧‧Circuit unit

16‧‧‧Circuit unit

2‧‧‧Motor

21‧‧‧ Stator coil set

22‧‧‧Rotor

3‧‧‧Motor drive

31‧‧‧Main drive circuit

311‧‧‧Drive current output

312‧‧‧Drive components

313‧‧‧ Hall sensor

3131‧‧‧Rotary signal output

32‧‧‧Detection Control Circuit

321‧‧‧Signal detection end

322‧‧‧First control output

323‧‧‧second control output

33‧‧‧Reservation drive circuit

331‧‧‧Drive current output

332‧‧‧Drive components

34‧‧‧Protective diodes

35‧‧‧Circuit unit

36‧‧‧Circuit unit

4‧‧‧Motor drive

41‧‧‧Main drive circuit

42‧‧‧Detection Control Circuit

43‧‧‧Reservation drive circuit

5‧‧‧Motor

51‧‧‧statar coil set

52‧‧‧Rotor

511‧‧‧First coil

512‧‧‧second coil

6‧‧‧Motor drive

61‧‧‧Main drive circuit

62‧‧‧Detection control circuit

63‧‧‧Reservation drive circuit

7‧‧‧Motor

71‧‧‧statar coil set

711‧‧‧First coil

712‧‧‧second coil

713‧‧‧third coil

72‧‧‧Rotor

9‧‧‧ Impeller

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

S2‧‧‧Electronic switch

S3‧‧‧Electronic switch

S4‧‧‧Electronic switch

S5‧‧‧Electronic switch

S6‧‧‧Electronic switch

S7‧‧‧Electronic switch

S8‧‧‧Electronic switch

[study]

81‧‧‧Control circuit

82‧‧‧Drive circuit

83‧‧‧Motor

831‧‧‧Rotor

9‧‧‧ Impeller

Figure 1: Schematic diagram of the drive architecture of a conventional motor drive unit.

Fig. 2 is a block diagram showing the driving structure of the motor driving device of the first embodiment of the present invention.

Fig. 3 is a circuit diagram showing the connection of the motor driving device of the first embodiment of the present invention.

Fig. 4 is a circuit diagram showing the connection of a motor driving device according to a second embodiment of the present invention.

Fig. 5 is a circuit diagram showing the connection of a motor driving device according to a third embodiment of the present invention.

Fig. 6 is a circuit diagram showing the connection of a motor driving device according to a fourth embodiment of the present invention.

Figure 7 is a block diagram showing the driving structure of the motor driving device of the fifth embodiment of the present invention.

Figure 8 is a block diagram showing the driving structure of the motor driving device of the sixth embodiment of the present invention.

1. . . Motor drive

11. . . Main drive circuit

111. . . Drive current output

12. . . Detection control circuit

13. . . Backup drive circuit

131. . . Drive current output

2. . . motor

twenty one. . . Stator coil set

twenty two. . . Rotor

9. . . impeller

Claims (26)

A motor driving device includes: a main driving circuit having a plurality of driving current output ends, wherein the plurality of driving current output ends are coupled to a stator coil group of a motor; and a detecting control circuit coupled to the main driving circuit And a backup driving circuit coupled to the detection control circuit, and the backup driving circuit also has a plurality of driving current output ends that are the same as the driving current output end of the main driving circuit, and the backup driving circuit The driving current output ends are respectively connected in parallel to the plurality of driving current output ends of the main driving circuit; wherein the main driving circuit generates a rotation signal, and inputs the rotation signal to the detection control circuit, if the detection control When the circuit determines that the rotation signal is normal, the detection control circuit generates a shutdown signal to control the backup drive circuit not to operate, and if the detection control circuit determines that the rotation signal is abnormal, the detection control circuit controls The backup drive circuit is activated. The motor driving device according to claim 1, wherein the main driving circuit further comprises a driving component, a control component and a Hall sensor, the driving component, the control component and the Hall sensor The driving component is a bridge circuit having a plurality of electronic switches, and the plurality of driving current outputs of the main driving circuit are led out from the plurality of output ends of the bridge circuit, the control component Having a plurality of control outputs, the plurality of control outputs of the control component are respectively connected to the plurality of electronic switches of the driving component, and the Hall sensor is connected Connect to the control component. The motor drive device of claim 2, wherein the control component of the main drive circuit and the drive assembly are formed in a drive control IC. The motor driving device of claim 3, wherein the Hall sensor of the main driving circuit is also formed in the driving control IC together with a control component of the main driving circuit and the driving component. The motor drive device of claim 2, wherein the control component further has a rotation signal output end, and the rotation signal output end is coupled to the detection control circuit. According to the motor drive device of claim 2, wherein the detection control circuit comprises a controller and a control switch, the controller has a signal detection end and a control output, and the signal detection of the controller The measuring end is connected to one of the rotating signal output ends of the control component, the control switch has a control end, a first connecting end and a second connecting end, and the control end of the control switch is connected to the control output end of the controller, and The first connection end and the second connection end of the control switch are respectively coupled to the power source and the backup drive circuit. The motor driving device according to claim 6, wherein the control relationship is a PMOS transistor switch or a relay. The motor drive device of claim 2, 5, 6 or 7 wherein the backup drive circuit further comprises a drive component, a control component and a Hall sensor, the drive of the backup drive circuit The component, the control component and the Hall sensor are coupled to the power source, and the driving component of the backup driving circuit is a bridge circuit having a plurality of electronic switches The plurality of driving current output terminals of the backup driving circuit are led out from a plurality of output terminals of the bridge circuit of the backup driving circuit, and the control component of the backup driving circuit has a plurality of control outputs, the backup driving The plurality of control outputs of the control component of the circuit are respectively connected to the plurality of electronic switches of the drive component of the backup drive circuit, and the Hall sensor of the backup drive circuit is connected to the control component of the backup drive circuit. The motor driving device according to claim 1, 2, 3, 4, 5, 6 or 7 of the patent application, further comprising a protective diode, wherein the protective diode system is disposed in series in the main driving circuit and the device Aid between the drive circuits. The motor driving device according to claim 8 , further comprising a protection diode, the protection diode system being disposed in series between the main driving circuit and the backup driving circuit. The motor driving device according to claim 8, wherein the control component of the backup driving circuit and the driving component are formed together in a driving control IC. The motor driving device according to claim 11, wherein the Hall sensor of the backup driving circuit is also formed in the driving control IC together with the control component and the driving component of the backup driving circuit. The motor driving device according to claim 9 , further comprising a circuit board unit, wherein the circuit board unit is a single circuit board, the main driving circuit, the detecting control circuit, and the backup driving circuit And the protection diode system is disposed on the single circuit board. The motor driving device according to claim 10, further comprising a circuit board unit, wherein the circuit board unit is a single circuit board The main driving circuit, the detecting control circuit, the backup driving circuit and the protection diode system are collectively disposed on the single circuit board. The motor driving device of claim 9, further comprising a circuit board unit, wherein the circuit board unit comprises two circuit board segments, and at least one of the circuit board units is provided with the main driving The circuit board, the other circuit board of the circuit board unit is provided with at least the backup driving circuit, and the detecting control circuit and the protection diode system are disposed on one of the two circuit board sheets. The motor driving device according to claim 15 , wherein the detecting control circuit and the backup driving circuit are disposed on the same circuit board. The motor driving device of claim 10, further comprising a circuit board unit, wherein the circuit board unit comprises two circuit board segments, and at least one of the circuit board units is provided with the main driving The circuit board, the other circuit board of the circuit board unit is provided with at least the backup driving circuit, and the detecting control circuit and the protection diode system are disposed on one of the two circuit board sheets. The motor driving device according to claim 17, wherein the detecting control circuit is disposed on the same circuit board together with the backup driving circuit. The motor driving device of the first aspect of the invention, wherein the main driving circuit further comprises a driving component and a Hall sensor, the driving component and the Hall sensor are coupled to a power source, The driving component is a bridge circuit having a plurality of electronic switches, and the plurality of driving current outputs of the main driving circuit are from the plurality of output ends of the bridge circuit The Hall sensor has at least one rotation signal output end, and the at least one rotation signal output end is connected to the detection control circuit. The motor driving device according to claim 19, wherein the detecting control circuit is a microcontroller, the detecting control circuit has a signal detecting end, a plurality of first control outputs, and a plurality of a control output circuit, wherein the signal detection end of the detection control circuit is connected to the rotation signal output end of the Hall sensor, and the plurality of first control output ends are respectively connected to the plurality of electronic switches of the driving component, A plurality of second control outputs of the detection control circuit are coupled to the backup drive circuit. The motor drive device of claim 20, wherein the backup drive circuit further comprises a drive component, the drive component of the backup drive circuit is coupled to a power supply, and the drive component of the backup drive circuit is a bridge circuit having a plurality of electronic switches, wherein the plurality of drive current output terminals of the backup drive circuit are led out from a plurality of output terminals of the bridge circuit of the backup drive circuit, and the number of the detection control circuits is The two control outputs are respectively connected to a plurality of electronic switches of the drive assembly. The motor driving device of claim 19, 20 or 21, further comprising a protective diode, the protective diode system being disposed in series between the main driving circuit and the backup driving circuit. The motor driving device according to claim 22, further comprising a circuit board unit, wherein the circuit board unit is a single circuit board, the main driving circuit, the detecting control circuit, and the backup driving circuit And the protection diode system is disposed on the single circuit board. According to the motor drive device of claim 22, wherein the other The circuit board unit comprises two circuit board segments, one of the circuit board units is provided with at least the main driving circuit, and the other circuit board unit of the circuit board unit is provided with at least the circuit board The driving circuit is spared, and the detection control circuit and the protection diode system are disposed on one of the two circuit boards. The motor driving device of claim 24, wherein the detection control circuit is disposed on the same circuit board together with the backup driving circuit. The motor drive device of claim 1, wherein the motor has a rotor, and the rotor of the motor is coupled to an impeller.