TW201214945A - Driving device of brushless DC motor for fan and driving method thereof - Google Patents

Abstract

A driving device of brushless DC motor for a fan includes a protection circuit, a storage circuit, a control circuit and a bridge circuit. The protection circuit is electrically connected with an auxiliary power. The storage circuit is electrically connected with the protection circuit, and receives the auxiliary power. The control circuit is electrically connected with the protection circuit and the storage circuit. The bridge circuit is electrically connected with the control circuit, and the bridge circuit includes a first switching unit, a second switching unit, a third switching unit and a fourth switching unit. The first switching unit and the second switching unit are coupled with one end of a motor coil, and the third switching unit and the fourth switching unit are coupled with the other end of the motor coil, and the first switching unit is electrically connected with the third switching unit, and the second switching unit is electrically connected with the third switching unit.

Description

201214945 VI. Description of the Invention: [Technical Field] [0001] The present invention relates to a driving device and a driving method thereof, and more particularly to a driving device for a DC brushless motor for a fan and a driving method thereof. [Previous Technology] [0002] Please refer to FIG. 1A, which is a conventional DC brushless motor driving device. Among them, the driving device 1 is driven by two 金-type MOS field-effect transistors as a switch to drive a DC brushless motor. Although the driving device 1 has the advantages of simple structure and low price, the driving device 1 is inefficient, and runs counter to the concept of environmental protection and energy saving emphasized today. In order to improve the efficiency of the driving device, a manufacturer has proposed a full-bridge structure driving device. Referring to FIG. 1A, the driving device 1A includes an upper bridge circuit and a lower bridge circuit. Among them, the upper bridge circuit is composed of two Ρ-type MOS field-effect transistors, and the lower-bridge circuit is composed of two Ν-type MOS field-effect transistors. Although the driving device 1 has better efficiency, the Ρ-type MOS field-effect transistor is inferior to the Ν-type MOS field effect transistor in switching performance and switching loss performance. Therefore, when applied to a fan with a larger power, or a driving technology requiring a higher switching speed, the general method is to change the 金-type gold-oxygen half-field effect transistor in the upper bridge circuit to the Ν-type gold-oxygen half-field effect. Crystal. In order to match the operating characteristics of the Ν-type MOS field-effect transistor, when the upper and lower bridge circuits are all motor-driven devices of the 金-type MOS field-effect transistor, the industry uses an integrated driver IC to control the driving device. However, the price of the integrated driver IC is not only expensive, but the operation of the integrated driver IC is 099131783. Form number Α0101 Page 4/25 page 0Ε 201214945 The voltage range is between 10~20 volts, so when the fan power supply is selected At less than 10 volts, the integrated drive 1C will not function properly. Therefore, how to provide a driving device for a DC brushless motor for a fan and a driving method thereof have a simple structure and a large operating voltage range, thereby increasing the applicability of the driving device and the quality of the motor, which has become an important issue. one. SUMMARY OF THE INVENTION [0003] In view of the above problems, an object of the present invention is to provide a DC brushless fan for a fan having a simple structure and having a large operating voltage range, thereby increasing the applicability of the driving device and the quality of the motor. Motor drive device and its driving method. In order to achieve the above object, a driving device for a DC brushless motor for a fan according to the present invention comprises a protection circuit, a storage circuit, a control circuit and a bridge circuit. The protection circuit is electrically connected to an auxiliary power source. The energy storage circuit is electrically connected to the protection circuit. The control circuit is electrically connected to the protection circuit and the energy storage circuit, and the control circuit receives a first control signal, a second control signal, a third control signal and a fourth control signal, respectively. The bridge circuit is electrically connected to the control circuit. The bridge circuit has a first switching unit, a second switching unit, a third switching unit and a fourth switching unit. The first switch unit and the second switch unit are coupled to one end of the motor coil, the third switch unit and the fourth switch unit are coupled to the other end of the motor coil, and the first switch unit is electrically connected to the third switch unit. The second switch unit is electrically connected to the fourth switch unit. The control circuit turns on the second switch unit and the fourth switch unit during the first operation, and turns on the first switch unit and the 099131783 four-switch unit during a second operation, and turns on the second during a third operation. Switch unit form No. A0101 Page 5 of 25 0992055700-0 201214945 Power supply with the third switching unit. And the energy storage circuit is in the first operation-receiving auxiliary embodiment, wherein the first switch unit of the bridge circuit, the music switch is early, and the flute is Μh, the first switch 70 and the fourth switch unit are respectively i gold oxygen half field effect transistor. A DC brushless motor for a fan according to the present invention is used in conjunction with a driving device, wherein: driving: a protection circuit, a storage circuit, a control circuit, and a bridge 1 circuit =:: and an auxiliary power supply Sexual connection. The energy storage circuit is connected to the protection and toughness. The control circuit and the protection circuit are stored in a separate manner - the first - controllable m signal - control - and - the fourth control signal. The bridge circuit is electrically connected to the control circuit, and the bridge circuit has a -th switch unit, a second switch unit, a second switch unit, and a fourth switch unit. The first switch unit and the second switch unit are coupled to one end of the motor, the third switch unit and the fourth switch unit are coupled to the motor, and the second switch unit and the third switch unit are electrically connected, _ The unit is electrically connected to the second switching unit. The driving method includes: during the first operation, turning on the second switching unit and the fourth switching unit according to the second (four) signal and the fourth (four) signal respectively, so that the energy storage circuit is in the first operation period; receiving the auxiliary power source, and Store it and enter it - during the second operation period and two

099131783 The third operation (4)-- during the second operation, respectively, according to the first control signal and the fourth control signal, the first switch unit and the fourth switch unit are turned on and enter the third operation period; and the third operation During the period, the second switching unit and the third switching unit are turned on according to the second control signal and the third control signal, respectively, and enter the second operation period. Form No. Α0101 Page 6 of 25 °9920557〇〇-〇 201214945 In this embodiment, the voltage of the auxiliary power supply is between 4 and 20 volts. [0004] As described above, the driving device of the DC brushless motor for a fan according to the present invention is applied by the combination of the energy storage circuit and the control circuit to provide the first switching unit conforming to the conduction bridge circuit. And the voltage level required for the third off unit 'to achieve a simple structure, and has a large operating voltage _ 'and thus increase the drive | the application and the product of the motor _ wind "DC brushless motor _ device and [Embodiment] Hereinafter, a driving method of a DC brushless motor for a fan according to the present invention will be described with reference to a phase of the present invention. First, please refer to _2 'which is a domain of the present invention. A driving device for a DC brushless motor of Jiashiguan 2. The driving device 2 comprises a protective electric (four) ... energy storage circuit 22, a control circuit 23 and a bridge circuit 24. The protection circuit 21 and the auxiliary power supply V.dd In the present embodiment, the protection circuit 21 has a -first protection unit and a -k protection unit D2 ❹ 'and in practice, the first protection unit D1 and the second protection unit (10) are respectively one Diode. Energy storage circuit 22 The material circuit 21t is connected. In the present embodiment, the moon circuit b circuit 22 has a -th capacitor C1&-second capacitor, wherein 'the first capacitor C1 and the second capacitor (10) and the first protection unit D1 and the first protection respectively The first protection unit D1 and the second protection unit D2 can prevent the voltage from being fed back to the auxiliary power supply V in addition to the first capacitor ci and the second capacitor C2. 099131783 Control circuit 23 is electrically connected to the protection circuit 21 and the energy storage circuit 22. Control Form No. A0101 Page 7 of 25 0992055700-0 201214945 The circuit 23 receives a first control signal SI, a second control signal S2, and a third The control circuit S3 and the fourth control signal S4. The bridge circuit 24 is electrically connected to the control circuit 23. In the embodiment, the bridge circuit 24 has a first switching unit Q1 and a second switching unit Q2. a third switching unit Q3 and a fourth switching unit Q4, wherein the first switching unit Q1 to the fourth switching unit Q4 are respectively an N-type metal oxide half field effect transistor. In addition, the source of the first switching unit Q1 And the first The drain of the switch unit Q2 is coupled to one end of a motor coil L. The source of the third switch unit Q3 and the drain of the fourth switch unit Q4 are coupled to the other end of the motor coil L, and the first switch unit Q1 The drain of the drain switch and the third switch unit Q3 is electrically connected to a motor drive power source V, and the source of the second switch unit Q2 and the source of the fourth switch unit Q4 are electrically connected to a ground terminal. The control circuit 23 receives the low level first control signal S1 and the third control signal S3, and the high level second control signal S2 and the fourth control signal S4 during a first operation period, and according to the second control The signal S2 and the fourth control signal S4 turn on the second switching unit Q2 and the fourth switching unit Q4, so that the first capacitor C1 and the second capacitor C2 of the tank circuit 22 receive the auxiliary power source Vy and store it. During a second operation, the control circuit 23 receives the high level first control signal S1 and the fourth control signal S4, and the low level second control signal S2 and the third control signal S3, and according to the first control signal S1 and The fourth control signal S4 turns on the first switching unit Q1 and the fourth switching unit Q4. During a third operation, the control circuit 23 receives the low level first control signal S1 and the fourth control signal S4, and the high level second control signal S2 and the third control signal S3, and according to the second control signal S 2 And the third control signal S3 turns on the second switching unit Q2 and the third switching unit Q3. 099131783 Form No. 1010101 Page 8 of 25 0992055700-0 201214945 In addition, it is worth mentioning that the control circuit 23 of the driving device 2 can be in the order of the first operation period, the second operation period and the third operation period. The motor is started, or the motor is started in the sequence of the first operation period, the third operation period, and the second operation period. Next, please refer to FIG. 3 to further explain the driving device 2 of the present invention. The control circuit 23 of the driving device 2 includes a fifth switching unit Q5, a sixth switching unit Q6, a seventh switching unit Q7, an eighth switching unit Q8, a first resistor R1, and a second resistor R2. A third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, and an eighth resistor R8. The fifth switch unit Q5 is electrically connected to the first control signal S1 and a ground terminal, respectively, and is turned on or off according to the first control signal S1. One end of the first resistor R1 is electrically connected to one end of the first protection unit D1 of the protection circuit 22, and the other end of the first protection unit D1 is connected to the auxiliary power source V. Electrical connection. One end of the second resistor R2 is electrically connected to the other end of the first resistor R1, and the other end of the second resistor R2 is electrically connected to the fifth switch unit Q5. The sixth switching unit Q6 is electrically connected to the first resistor R1, the second resistor R2 and the first capacitor C1 of the tank circuit 22, respectively. In the present embodiment, the fifth switching unit Q5 is a Ν-type MOS field effect transistor, and the sixth switching unit Q6 is a Ρ-type MOS field effect transistor. One end of the third resistor R3 is electrically connected to the sixth switching unit Q6, and the other end of the third resistor R3 is electrically connected to the gate of the first switching unit Q1 of the bridge circuit 24. One end of the fourth resistor R4 is electrically connected to the other end of the third resistor R3, and the other end of the fourth resistor R4 is electrically connected to the source of the first switching unit Q1 of the bridge circuit 24. The third resistor R3 and the fourth resistor R4 are used to adjust the speed at which the first switching unit Q1 is turned on and the 099131783 form number Α0101 page 9 / 25 pages 0992055700-0 201214945 cutoff. In practical application, the third resistor R3 and the fourth resistor R4 are selected to satisfy the following formula (1): R4/( R3 + R4)*Vw-V, > 4V (volt) (1) dd Is Where V is the source voltage of the first switching unit Q1. The seventh switch unit Q7 is electrically connected to the third control signal S3 and a ground terminal, respectively, and is turned on or off according to the third control signal S3. One end of the fifth resistor R5 is electrically connected to one end of the second protection unit D2 of the protection circuit 22, and the other end of the second protection unit D2 is electrically connected to the auxiliary power source Vy. One end of the sixth resistor R6 is electrically connected to the other end of the fifth resistor R5, and the other end of the sixth resistor R6 is electrically connected to the seventh switch unit Q7. The eighth switching unit Q8 is electrically connected to the fifth resistor R5, the sixth resistor R6, and the second capacitor C2 of the tank circuit 22, respectively. In the present embodiment, the seventh switching unit Q7 is a Ν-type MOS field effect transistor, and the eighth switching unit Q8 is a Ρ-type MOS field effect transistor. One end of the seventh resistor R7 is electrically connected to the eighth switching unit Q8, and the other end of the seventh resistor R7 is electrically connected to the gate of the third switching unit Q3 of the bridge circuit 24. One end of the eighth resistor R8 is electrically connected to the other end of the seventh resistor R7, and the other end of the eighth resistor R8 is electrically connected to the source of the third switching unit Q3 of the bridge circuit 24. The seventh resistor R7 and the eighth resistor R8 are used to adjust the speed at which the third switching unit Q3 is turned on and off. In practical application, the seventh resistor R7 and the eighth resistor R8 are selected to satisfy the following formula (2): R8/( R7+R8)*Vw-VQ > 4V (volt) (2) dd 3s , V. It is the source voltage of the third switching unit Q3. The drain of the first switching unit 〇1 of the bridge circuit 24 of the driving device 2 and the drain of the third switching unit Q3 are electrically connected to the motor driving power source Vee. The second opening 099131783 Form No. A0101 Page 10 of 25 0992055700-0 201214945 The source of the closing unit Q2 and the source of the fourth switching unit Q4 are electrically connected to the ground. In addition, the gate of the second switching unit Q2 and the gate of the fourth switching unit Q4 are electrically connected to the second control signal S2 and the fourth control signal S4 respectively, and are respectively according to the second control signal S2 and the fourth control signal S4. Turn on or off.

Referring to the flowchart of FIG. 4A and FIG. 3, the driving method of the preferred embodiment of the present invention can be used in conjunction with the above-described driving device 2, and the driving device for the DC brushless motor for the fan is used. The steps of the driving method include steps S01 to S03. In addition, in order to more clearly explain the correspondence between the first to eighth switch units Q1 to (10) of the control circuit 23 of the present invention and the first to fourth control signals S1 to S4, please refer to FIG. State diagram. Step S01 is to turn on the second switching unit Q2 and the fourth switching unit Q4 ′ according to the second control signal s2 and the fourth control signal S4 respectively during a first operation to enable the energy storage circuit 22 to receive during the first operation. Auxiliary power supply v dd 'and store the auxiliary power supply.

In operation, the second shut-off unit Q2 and the fourth switch unit Q4 receive the high-level second control signal S2 and the fourth control signal S4, and the auxiliary power supply Vdd passes through the first protection unit D1 and the second. The protection unit D2 charges the first capacitor C1 and the second capacitor C2 of the storage circuit 22. At the same time, the first control signal S1 and the third control signal S3 are low-level signals, and thus the first switching unit Q1 The third switching unit 叩 and the fifth switching unit Q5 to the eighth switching unit Q8 are all in an off state. In addition, when the potential stored by the first capacitor C1 and the second capacitor C2 reaches the potential of the auxiliary power source Vdd, the process proceeds to step S02. . Step S02 is to turn on the first switching unit Q1 and the fourth switching unit according to the first control signal S1 099131783, the form number A0101, the 11th page, the 25th page 0992055700-0201214945, and the fourth control signal S4, respectively. Q4. In practical application, since the fifth switching unit Q5 and the sixth switching unit Q6 are respectively an N-type MOSFET and a P-type MOSFET, when the first control signal S1 is at a high level, The fifth switching unit Q5 and the sixth switching unit Q6 are turned on, and a discharge path of the first capacitor C1 is provided to discharge the auxiliary power source Vdd stored therein. Further, since the selection of the third resistor R3 and the fourth resistor R4 satisfies the requirements of the above formula (1). Therefore, when the first control signal S1 is at a high level, the first capacitor C1 can be discharged to turn on the first switching unit Q1. Furthermore, the fourth switching unit Q4 is turned on in accordance with the fourth control signal S4, and the motor driving power source VCC is passed through the motor coil L, thereby driving the motor. In addition, at the same time, the second control signal S2 and the third control signal S3 are low level signals, and thus the second switching unit Q2, the third switching unit Q3, the seventh switching unit Q7 and the eighth switching unit Q8 are Cutoff status. Step S03 is to turn on the second switching unit Q2 and the third switching unit Q3 according to the second control signal S2 and the third control signal S3 respectively during a third operation. In practical operation, since the seventh switching unit Q7 and the eighth switching unit Q8 are respectively an N-type MOSFET and a P-type MOS field-effect transistor, when the third control signal S3 is at a high level, The seventh switching unit Q7 and the eighth switching unit Q8 are turned on, and a second capacitor C2-discharge path is provided to discharge the auxiliary power source stored therein. Further, since the selection of the seventh resistor R7 and the eighth resistor R8 satisfies the requirements of the above formula (2). Therefore, when the third control signal S3 is at the high level, the second capacitor C2 can be discharged to turn on the third switching unit Q3. 099131783 Form No. 1010101 Page 12/Total 25 Page 0992055700-0 201214945 Furthermore, the second switching unit Q2 will be turned on according to the second control signal, and the motor driving power source Vcc is passed through the motor coil 1 to drive the motor. At the same time, the first control signal and the fourth control signal S4 are low level signals, and thus the first switch unit Q1, the fourth switch unit, the fifth switch unit Q5 and the sixth switch unit are all in a load state. Further, it is worthwhile to raise the 疋' when the motor is started after the steps SQ1 to SQ3, and the step SQ2 and the steps can be repeated to continue the operation of the motor. However, if it needs to be restarted after stopping, it needs to be implemented by step S (U. In addition, in practical applications, the first control nickname S, the second control signal S2, the third control signal 53, and the fourth control s No. S4 is a PWM signal or a DC voltage %. Next, please refer to the flowchart of FIG. 4B and the driving method of another preferred embodiment of the present invention shown in the circle 3, which can be driven by the above. The steps of the driving method of the driving device for the brushless DC brushless motor of the fan are the steps S11 to S13. In the present embodiment, the motor is started in the order of step S11, step S12 and step 13. And the motor continues to operate by repeating steps S12 and S13. Since the technical features of step S11, step S12, and step S13 are the same as steps S01, S03, and S02 of the above embodiment, Further, by the above hardware architecture and driving method, when the voltage of the auxiliary power source V& is between 4 and 20 volts, the first switching unit Q1 and the third switching unit Q3 can be turned on. Therefore, the present invention will have Large operating voltage range, and can be widely used in different needs and design of motor drive. In summary, the drive device for DC brushless motor for fan according to the present invention is based on energy storage circuit and control The circuit is used in conjunction with the application of the 099131783 form number Α0101, page 13 / 25 pages 0992055700-0 201214945 to meet the voltage level required by the first switching unit and the third switching unit of the conduction bridge circuit, thereby achieving a simple structure And a driving device for a DC brushless motor for a fan having a large operating voltage range, thereby increasing the applicability of the driving device and the quality of the motor, and a driving method thereof. The foregoing is merely illustrative, not limiting. Any equivalent modifications or alterations to the spirit and scope of the present invention should be included in the scope of the appended claims. [FIG. 1A and FIG. A schematic diagram of a driving device for a DC brushless motor for a fan; FIG. 2 is a DC brushless motor for a fan according to a preferred embodiment of the present invention; FIG. 3 is a schematic diagram of a driving device of a DC brushless motor for a fan according to a preferred embodiment of the present invention; FIG. 4A is a flow chart showing a driving method of a driving device according to a preferred embodiment of the present invention; 4B is a flow chart showing another driving method of the driving device according to the preferred embodiment of the present invention; and FIG. 5 is a schematic diagram showing the state between the switching unit and the control signal of the control circuit according to the preferred embodiment of the present invention. Component Symbol Description [0006] ΙΑ, 1B, 2: Drive 21: Protection Circuit 22: Energy Storage Circuit 2 3: Control Circuit 099131783 Form No. A0101 Page 14 of 25 0992055700-0 201214945

24: Bridge circuit C1: First capacitor C2: Second capacitor D1: First protection unit D2: Second protection unit L: Motor coil Q1: First switching unit Q2: Second switching unit Q3: Third switching unit Q4 : fourth switching unit Q5: fifth switching unit Q6: sixth switching unit Q7: seventh switching unit

Step Q8 of the driving method: eighth switching unit R1: first resistor R2: second resistor R3: third resistor R4: fourth resistor R5: fifth resistor R6: sixth resistor R7: seventh Resistor R8: eighth resistor S01-S03 'S11-S13 51 : first control signal 52 : second control signal 53 : third control signal 099131783 form number A0101 page 15 / total 25 page 0992055700-0 201214945 S4 : Fourth control signal vee: motor drive power supply Vw: auxiliary power supply αα 099131783 Form No. 1010101 Page 16 / Total 25 Page 0992055700-0

Claims (1)

201214945 VII. Patent application scope: 1. A driving device for a DC brushless motor for a fan, comprising: a protection circuit electrically connected to an auxiliary power source; a storage circuit electrically connected to the protection circuit; a control circuit, Electrically connecting with the pure protection circuit and the Wei circuit, the escrow circuit respectively receives a -first control signal, a second control signal, a second control signal and a fourth control signal; and - a bridge circuit' The (four) circuit and connection, the bridge circuit has - 〇帛 - switch single n two switch unit, - third switch unit and - fourth switch unit, the first switch unit and the second switch unit and a motor coil The third switch unit and the third switch unit are connected to the other end of the motor coil, and the first switch unit is electrically connected to the third switch unit, the second switch unit and the The fourth switch unit is electrically connected, wherein the control circuit is in the -first operation period g, the second switch unit and the fourth switch unit are turned on, and during the second operation, the first switch Ο and the first Turn off 'and to - during a third shoving as, turning on the second switching unit and the third switch material, hidden in the tank circuit of - receiving the auxiliary power during operation. 2. If _ please patent scope! The driving device of the invention, wherein the protection circuit has a first protection unit and a second protection unit. 3. The driving device of claim 2, wherein the first protection unit and the second protection unit are respectively a diode. 4. The driving device of claim 1, wherein the energy storage circuit has a first capacitor and a second capacitor. 099131783 Form No. A0101 Page/Total 25 Pages 0992055700-0 201214945 5 · If you apply for a patent scope! The driving circuit of the item, wherein the bridge circuit, the first switch unit, the second switch unit, the third switch unit and the fourth switch unit are respectively an N-type metal oxide half field effect transistor. 6. The driving device of claim 2, wherein the first switch unit is electrically connected to the third switch unit and the motor drive power source. 7 · ^ Apply for patent coverage! The driving device, wherein the second unit and the fourth switch unit are electrically connected to a ground. 8. The driving device of claim i, wherein the control circuit comprises: a fifth switching unit electrically connected to the first control signal; a first resistor having one end electrically connected to the protection circuit a second resistor, the - terminal is electrically connected to the first resistor and the other end is electrically connected to the fifth switch unit; - a sixth switch unit, and the first resistor, the first The two resistors and the energy storage circuit are electrically connected; ° - the third resistor H' is connected to the first pass and the other end of the second resistor H is opposite to the bridge <_ The fourth resistor is electrically connected to the other end of the third resistor and the other end of the fourth resistor is connected to one end of the first switching unit of the bridge circuit Electrical connection; the switching unit is electrically connected to the third control signal; a fifth resistor is electrically connected to the protection circuit; and - the second end of the resistor is electrically connected to the fifth resistor Sexual connection, and the other end is electrically connected to the seventh switch unit; 099131783 an eighth The unit form number Α0101 is respectively connected to the fifth resistor page 18/25, the sixth resistor and 0992055700-0 201214945 9 Ο ίο with G 099131783, the storage circuit is electrically connected; a seventh resistor, The first squirrel is electrically connected to the eighth switch unit, and the other end of the sigma resistor is electrically connected to the third _ unit of the bridge circuit; Eight resistors, which are - Di Ming, aunt. The other end of the seventh resistor is electrically connected, and the other end of the eighth resistor is electrically connected to one end of the third switching unit of the bridge circuit. The invention relates to the driving device described in claim 8, wherein the fifth switch 00 "the seventh switch single % system is - N type gold oxygen half field effect transistor ^ the (10) Guan Wei Wei the first person - single Fu is a P-type gold-oxygen half-field effect transistor. • A DC brushless motor method for fans, which is combined with a driving device, wherein the driving device has a protection circuit, a storage circuit, and a control circuit. a bridge circuit, the protection circuit is electrically connected to the auxiliary power source and electrically connected to the protection circuit, the control circuit is electrically connected to the protection circuit and the energy storage circuit, and respectively receives a first control a signal, a second control signal, a third control signal, and a fourth control signal. The bridge circuit is electrically connected to the control circuit, and the bridge circuit has a first switch unit and a second switch unit. a third switching unit and a fourth switching unit, wherein the first switching unit and the second switching unit are coupled to the end of the motor, the third switching unit and the fourth switching unit and the motor are further End face connection, The first switch unit is electrically connected to the third switch unit, and the second switch unit is electrically connected to the fourth switch unit. The driving method comprises: during the -first operation, respectively according to the second control signal The fourth control signal turns on the second switch unit and the fourth switch unit, so that the form number A0101 page 19/25 pages 0992055700-0 201214945 is capable of receiving the auxiliary power during the first operation period, And storing the 'and entering one of the operation period of the brother and the third operation period; during the first operation period of the Hai, the first switch unit and the fourth control unit are turned on according to the first control signal and the fourth control signal respectively a fourth switching unit, and entering the third operation period; and during the third operation, turning on the second switching unit and the third switching unit according to the second control signal and the third control sfl number, respectively The driving method of claim 10, wherein the first control signal, the second control chain, the third control paper And the fourth control signal is a PWM signal or a DC voltage signal. The driving method of claim 10, wherein the auxiliary power supply voltage is between 4 and 20 volts. 0992055700-0 099131783 No. A0101 Page 20 of 25