Multiple fan drive

Abstract

The present invention discloses a driving device for multiple fans, which is used to drive a first fan device and a second fan device. The driving device for multiple fans includes a controller, a first fan driving circuit, a second fan driving circuit, and a protection and input interface circuit. The controller controls the first fan driving circuit to drive the first fan device; the controller controls the second fan driving circuit to drive the second fan device; the protection and input interface circuit is used to protect the first fan driving circuit and the second fan driving circuit; the protection and input interface circuit is a common input interface of the first fan driving circuit and the second fan driving circuit. The effect of the present invention is to reduce the cost of the driving device for multiple fans and reduce the volume of the driving device for multiple fans.

Description

[0001] This application is a divisional application of the invention patent application of Delta Electronics Industrial Co., Ltd. (filing date is January 29, 2016, application number is 201610065157.1, invention name is "driving device for multiple fans"). Technical Field

[0002] The present invention relates to a driving device for a fan, and in particular to a driving device for multiple fans. Background Art

[0003] The fans of the related art are used to reduce the temperature, so the fans of the related art are very important for the human body or electronic products. In some cases, multiple fans of the related art in the electronic product are driven simultaneously to reduce the temperature. However, the fans of the prior art each include their own controller and protection and input interface circuit. In other words, when the electronic product drives two fans, two controllers and two protection and input interface circuits are required, and driving three fans requires three controllers and three protection and input interface circuits, and so on. Therefore, when multiple fans are set in the electronic product, the cost of the electronic product will be too high and the size will be too large (because multiple controllers and multiple protection and input interface circuits are required). Summary of the invention

[0004] In order to improve the above-mentioned disadvantages of the prior art that multiple fans are provided, which results in high cost and large volume of electronic products, an object of the present invention is to provide a driving device for multiple fans.

[0005] To achieve the above-mentioned purpose of the present invention, the driving device of multiple fans of the present invention is used to drive a first fan device and a second fan device, and the driving device of multiple fans includes: a controller; a first fan driving circuit, the first fan driving circuit is electrically connected to the controller and the first fan device; a second fan driving circuit, the second fan driving circuit is electrically connected to the controller, the first fan driving circuit and the second fan device; and a protection and input interface circuit, the protection and input interface circuit is electrically connected to the first fan driving circuit and the second fan driving circuit, and is used to protect the first fan driving circuit and the second fan driving circuit. The controller controls the first fan driving circuit to drive the first fan device; the controller controls the second fan driving circuit to drive the second fan device; and the protection and input interface circuit is a common input interface of the first fan driving circuit and the second fan driving circuit.

[0006] Furthermore, in a first specific embodiment, the driving device of multiple fans as described above, wherein the first fan driving circuit includes: a first control line, the first control line is electrically connected to the controller; a second control line, the second control line is electrically connected to the controller; a third control line, the third control line is electrically connected to the controller; a fourth control line, the fourth control line is electrically connected to the controller; a first transistor switch, the first transistor switch is electrically connected to the first control line and the first fan device; a second transistor switch, the second transistor switch is electrically connected to the second control line, the first fan device and the protection and input interface circuit; a third transistor switch, the third transistor switch is electrically connected to the third control line, the first fan device and the second transistor switch; and a fourth transistor switch, the fourth transistor switch is electrically connected to the fourth control line, the first fan device, the protection and input interface circuit and the first transistor switch.

[0007] Furthermore, in the first specific embodiment, the driving device of multiple fans as described above, wherein the second fan driving circuit includes: a fifth control line, the fifth control line is electrically connected to the controller; a sixth control line, the sixth control line is electrically connected to the controller; a seventh control line, the seventh control line is electrically connected to the controller; an eighth control line, the eighth control line is electrically connected to the controller; a fifth transistor switch, the fifth transistor switch is electrically connected to the fifth control line and the second fan device; a sixth transistor switch, the sixth transistor switch is electrically connected to the sixth control line, the second fan device and the protection and input interface circuit; a seventh transistor switch, the seventh transistor switch is electrically connected to the seventh control line, the second fan device and the sixth transistor switch; and an eighth transistor switch, the eighth transistor switch is electrically connected to the eighth control line, the second fan device, the protection and input interface circuit and the fifth transistor switch.

[0008] Furthermore, in the first specific embodiment, the driving device of multiple fans as described above, wherein when the controller transmits a conduction signal to the first transistor switch through the first control line to drive the first transistor switch, the controller transmits a pulse width modulation signal to the second transistor switch through the second control line to drive the second transistor switch, and the controller does not turn on the third transistor switch, and the controller does not transmit the pulse width modulation signal to the fourth transistor switch, so that the fourth transistor switch is not turned on and the first fan device is driven. wherein when the controller transmits the conduction signal to the third transistor switch through the third control line to drive the third transistor switch, the controller transmits the pulse width modulation signal to the fourth transistor switch through the fourth control line to drive the fourth transistor switch, and the controller does not turn on the first transistor switch, and the controller does not transmit the pulse width modulation signal to the second transistor switch, so that the second transistor switch is not turned on and the first fan device is driven.

[0009] Furthermore, in the first embodiment, when the controller transmits the conduction signal to the fifth transistor switch through the fifth control line to drive the fifth transistor switch, the controller transmits the pulse width modulation signal to the sixth transistor switch through the sixth control line to drive the sixth transistor switch, and the controller does not conduct the seventh transistor switch, and the controller does not transmit the pulse width modulation signal to the eighth transistor switch, so that the eighth transistor switch is not conducted and the second fan device is driven. Wherein when the controller transmits the conduction signal to the seventh transistor switch through the seventh control line to drive the seventh transistor switch, the controller transmits the pulse width modulation signal to the eighth transistor switch through the eighth control line to drive the eighth transistor switch, and the controller does not conduct the fifth transistor switch, and the controller does not transmit the pulse width modulation signal to the sixth transistor switch, so that the sixth transistor switch is not conducted and the second fan device is driven.

[0010] Furthermore, in a second specific embodiment, the driving device of multiple fans as described above, wherein the first fan driving circuit includes: a first signal line, the first signal line is electrically connected to the controller; a second signal line, the second signal line is electrically connected to the controller; a first transistor switch, the first transistor switch is electrically connected to the first signal line, the first fan device and the protection and input interface circuit; and a second transistor switch, the second transistor switch is electrically connected to the second signal line, the first fan device and the first transistor switch.

[0011] Furthermore, in the second specific embodiment, the driving device of multiple fans as described above, wherein the second fan driving circuit includes: a third signal line, the third signal line is electrically connected to the controller; a fourth signal line, the fourth signal line is electrically connected to the controller; a third transistor switch, the third transistor switch is electrically connected to the third signal line, the second fan device and the protection and input interface circuit; and a fourth transistor switch, the fourth transistor switch is electrically connected to the fourth signal line, the second fan device and the third transistor switch.

[0012] Furthermore, in the second specific embodiment, the driving device for multiple fans as described above, wherein when the controller transmits a pulse width modulation signal to the first transistor switch through the first signal line to drive the first transistor switch, the controller does not transmit the pulse width modulation signal to the second transistor switch, so that the second transistor switch is not turned on and the first fan device is driven. wherein when the controller transmits the pulse width modulation signal to the second transistor switch through the second signal line to drive the second transistor switch, the controller does not transmit the pulse width modulation signal to the first transistor switch, so that the first transistor switch is not turned on and the first fan device is driven.

[0013] Furthermore, in the second specific embodiment, when the controller transmits the pulse width modulation signal to the third transistor switch through the third signal line to drive the third transistor switch, the controller does not transmit the pulse width modulation signal to the fourth transistor switch, so that the fourth transistor switch is not turned on and the second fan device is driven. Wherein when the controller transmits the pulse width modulation signal to the fourth transistor switch through the fourth signal line to drive the fourth transistor switch, the controller does not transmit the pulse width modulation signal to the third transistor switch, so that the third transistor switch is not turned on and the second fan device is driven.

[0014] Furthermore, in a third specific embodiment, the driving device of multiple fans as described above, wherein the first fan driving circuit comprises: a first driving line, the first driving line is electrically connected to the controller; a second driving line, the second driving line is electrically connected to the controller; a pulse width modulation signal transmission line, the pulse width modulation signal transmission line is electrically connected to the controller; a first AND gate unit, the first AND gate unit is electrically connected to the first driving line and the pulse width modulation signal transmission line; a second AND gate unit, the second AND gate unit is electrically connected to the second driving line and the pulse width modulation signal transmission line; a signal transmission line; a first transistor switch, the first transistor switch being electrically connected to the first drive line and the first fan device; a second transistor switch, the second transistor switch being electrically connected to the first AND gate unit, the first fan device and the protection and input interface circuit; a third transistor switch, the third transistor switch being electrically connected to the second drive line, the first fan device and the second transistor switch; and a fourth transistor switch, the fourth transistor switch being electrically connected to the second AND gate unit, the first fan device, the protection and input interface circuit and the first transistor switch.

[0015] Furthermore, in the third specific embodiment, the driving device of multiple fans as described above, wherein the second fan driving circuit includes: a third driving line, the third driving line is electrically connected to the controller; a fourth driving line, the fourth driving line is electrically connected to the controller; a third AND gate unit, the third AND gate unit is electrically connected to the third driving line and the pulse width modulation signal transmission line; a fourth AND gate unit, the fourth AND gate unit is electrically connected to the fourth driving line and the pulse width modulation signal transmission line; a fifth transistor switch, the fifth transistor switch is electrically connected to the third driving line and the second fan device; a sixth transistor switch, the sixth transistor switch is electrically connected to the third AND gate unit, the second fan device and the protection and input interface circuit; a seventh transistor switch, the seventh transistor switch is electrically connected to the fourth driving line, the second fan device and the sixth transistor switch; and an eighth transistor switch, the eighth transistor switch is electrically connected to the fourth AND gate unit, the second fan device, the protection and input interface circuit and the fifth transistor switch.

[0016] Furthermore, in the third specific embodiment, the driving device of multiple fans as described above, wherein the controller transmits a pulse width modulation signal to the first AND gate unit, the second AND gate unit, the third AND gate unit and the fourth AND gate unit through the pulse width modulation signal transmission line. When the controller transmits a conduction signal to the first transistor switch and the first AND gate unit through the first driving line, the first transistor switch is driven, and the second transistor switch is driven through the first AND gate unit, and the controller does not transmit the conduction signal to the third transistor switch and the second AND gate unit, so that the third transistor switch and the fourth transistor switch are not turned on and the first fan device is driven. When the controller transmits the conduction signal to the third transistor switch and the second AND gate unit through the second driving line, the third transistor switch is driven, and the fourth transistor switch is driven through the second AND gate unit, and the controller does not transmit the conduction signal to the first transistor switch and the first AND gate unit, so that the first transistor switch and the second transistor switch are not turned on and the first fan device is driven. When the controller transmits the conduction signal to the fifth transistor switch and the third AND gate unit through the third driving line, the fifth transistor switch is driven, and the sixth transistor switch is driven through the third AND gate unit, and the controller does not transmit the conduction signal to the seventh transistor switch and the fourth AND gate unit, so that the seventh transistor switch and the eighth transistor switch are not turned on and the second fan device is driven. When the controller transmits the conduction signal to the seventh transistor switch and the fourth AND gate unit through the fourth driving line, the seventh transistor switch is driven, and the eighth transistor switch is driven through the fourth AND gate unit, and the controller does not transmit the conduction signal to the fifth transistor switch and the third AND gate unit, so that the fifth transistor switch and the sixth transistor switch are not turned on and the second fan device is driven.

[0017] The invention has the effect of reducing the cost and volume of the driving device of multiple fans. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 FIG. 4 is a block diagram of a driving device for multiple fans of the present invention.

[0019] Figure 2 It is a circuit diagram of a first specific embodiment of a driving device for multiple fans of the present invention.

[0020] Figure 3 This is a waveform diagram of a first specific embodiment of a driving device for multiple fans of the present invention.

[0021] Figure 4 This is a waveform diagram of a first specific embodiment of a driving device for multiple fans of the present invention.

[0022] Figure 5 It is a circuit diagram of a second specific embodiment of a driving device for multiple fans of the present invention.

[0023] Figure 6 This is a waveform diagram of a second specific embodiment of a driving device for multiple fans of the present invention.

[0024] Figure 7 This is a waveform diagram of a second specific embodiment of a driving device for multiple fans of the present invention.

[0025] Figure 8 It is a circuit diagram of a third specific embodiment of a driving device for multiple fans of the present invention.

[0026] Fig. 9 It is a waveform diagram of the third specific embodiment of the driving device for multiple fans of the present invention.

[0027] Fig.10 It is a waveform diagram of the third specific embodiment of the driving device for multiple fans of the present invention.

[0028] Description of reference numerals:

[0029] Multiple fan driving device 10

[0030] The first fan device 20

[0031] The second fan device 30

[0032] DC voltage supply unit 40

[0033] Controller 106

[0034] The first fan driving circuit 108

[0035] The second fan driving circuit 110

[0036] The first Hall element 112

[0037] Protection and input interface circuit 114

[0038] The second Hall element 116

[0039] Pulse width modulation signal 118

[0040] First signal line 120

[0041] The second signal line 122

[0042] The third signal line 124

[0043] Fourth signal line 126

[0044] First driving line 128

[0045] The second driving line 130

[0046] Pulse width modulation signal transmission line 132

[0047] The first AND gate unit 134

[0048] The second AND gate unit 136

[0049] The third driving line 138

[0050] Fourth driving line 140

[0051] The third AND gate unit 142

[0052] The fourth AND gate unit 144

[0053] Conductive signal 146

[0054] The first control line M1L1

[0055] The second control line M1L1PWM

[0056] The third control line M1L2

[0057] The fourth control line M1L2PWM

[0058] Fifth control line M2L1

[0059] The sixth control line M2L1PWM

[0060] Seventh control line M2L2

[0061] The eighth control line M2L2PWM

[0062] The first common endpoint P1

[0063] The second common endpoint P2

[0064] The third common endpoint P3

[0065] Fourth common endpoint P4

[0066] The first transistor switch Q1

[0067] Second transistor switch Q2

[0068] The third transistor switch Q3

[0069] The fourth transistor switch Q4

[0070] Fifth transistor switch Q5

[0071] The sixth transistor switch Q6

[0072] Seventh transistor switch Q7

[0073] Eighth transistor switch Q8

[0074] The first driving signal S1

[0075] The second driving signal S2

[0076] The third driving signal S3

[0077] The fourth driving signal S4

[0078] Time point t0

[0079] Time point t1

[0080] Time point t2 DETAILED DESCRIPTION

[0081] For detailed description and technical contents of the present invention, please refer to the following detailed description and accompanying drawings, which are only used for explanation and are not intended to limit the present invention.

[0082] Please refer to Figure 1 , which is a block diagram of a driving device for multiple fans of the present invention. A driving device for multiple fans 10 is applied to a DC voltage supply unit 40 (which may be, for example, but the present invention is not limited to, a battery); the driving device for multiple fans 10 is used to drive a first fan device 20 and a second fan device 30.

[0083] The multiple fan driving device 10 includes a controller 106, a first fan driving circuit 108, a second fan driving circuit 110, and a protection and input interface circuit 114. The first fan device 20 includes a first Hall element 112; the second fan device 30 includes a second Hall element 116.

[0084] The first fan driving circuit 108 is electrically connected to the controller 106 and the first fan device 20; the second fan driving circuit 110 is electrically connected to the controller 106, the first fan driving circuit 108 and the second fan device 30; the first Hall element 112 is electrically connected to the controller 106; the protection and input interface circuit 114 is electrically connected to the first fan driving circuit 108 and the second fan driving circuit 110; the second Hall element 116 is electrically connected to the controller 106.

[0085] The controller 106 controls the first fan driving circuit 108 to drive the first fan device 20; the controller 106 controls the second fan driving circuit 110 to drive the second fan device 30; the protection and input interface circuit 114 is used to protect the first fan driving circuit 108 and the second fan driving circuit 110; the protection and input interface circuit 114 is a common input interface of the first fan driving circuit 108 and the second fan driving circuit 110.

[0086] Furthermore, the controller 106 receives a voltage of, for example, 5 volts (not shown) but the present invention is not limited thereto. Figure 1 ) to drive the controller 106; the first Hall element 112 and the second Hall element 116 receive an appropriate voltage (not shown in Figure 1 ) to drive the first Hall element 112 and the second Hall element 116.

[0087] Please refer to Figure 2 , which is a circuit diagram of a first specific embodiment of a driving device for multiple fans of the present invention. Figure 2 The components shown are described in Figure 1 For the sake of brevity, the similarities are not repeated here.

[0088] The first fan driving circuit 108 includes a first control line M1L1, a second control line M1L1PWM, a third control line M1L2, a fourth control line M1L2PWM, a first transistor switch Q1, a second transistor switch Q2, a third transistor switch Q3, and a fourth transistor switch Q4. The second fan driving circuit 110 includes a fifth control line M2L1, a sixth control line M2L1PWM, a seventh control line M2L2, an eighth control line M2L2PWM, a fifth transistor switch Q5, a sixth transistor switch Q6, a seventh transistor switch Q7, and an eighth transistor switch Q8.

[0089] The first control line M1L1 is electrically connected to the controller 106; the second control line M1L1PWM is electrically connected to the controller 106; the third control line M1L2 is electrically connected to the controller 106; the fourth control line M1L2PWM is electrically connected to the controller 106; the first transistor switch Q1 is electrically connected to the first control line M1L1 and the first fan device 20; the second transistor switch Q2 is electrically connected to the second control line M1L1PWM, the first fan device 20 and the protection and input interface circuit 114; the third transistor switch Q3 is electrically connected to the third control line M1L2, the first fan device 20 and the second transistor switch Q2; the fourth transistor switch Q4 is electrically connected to the fourth control line M1L2PWM, the first fan device 20, the protection and input interface circuit 114 and the first transistor switch Q1. In addition, the second transistor switch Q2 and the third transistor switch Q3 are electrically connected to a first common node P1, and the first fan device 20 is electrically connected to the second transistor switch Q2 and the third transistor switch Q3 via the first common node P1. The first transistor switch Q1 and the fourth transistor switch Q4 are electrically connected to a second common node P2, and the first fan device 20 is electrically connected to the first transistor switch Q1 and the fourth transistor switch Q4 via the second common node P2.

[0090] The fifth control line M2L1 is electrically connected to the controller 106; the sixth control line M2L1PWM is electrically connected to the controller 106; the seventh control line M2L2 is electrically connected to the controller 106; the eighth control line M2L2PWM is electrically connected to the controller 106; the fifth transistor switch Q5 is electrically connected to the fifth control line M2L1 and the second fan device 30; the sixth transistor switch Q6 is electrically connected to the sixth control line M2L1PWM, the second fan device 30 and the protection and input interface circuit 114; the seventh transistor switch Q7 is electrically connected to the seventh control line M2L2, the second fan device 30 and the sixth transistor switch Q6; the eighth transistor switch Q8 is electrically connected to the eighth control line M2L2PWM, the second fan device 30, the protection and input interface circuit 114 and the fifth transistor switch Q5. In addition, the sixth transistor switch Q6 and the seventh transistor switch Q7 are electrically connected to a third common node P3, and the second fan device 30 is electrically connected to the sixth transistor switch Q6 and the seventh transistor switch Q7 via the third common node P3. The fifth transistor switch Q5 and the eighth transistor switch Q8 are electrically connected to a fourth common node P4, and the second fan device 30 is electrically connected to the fifth transistor switch Q5 and the eighth transistor switch Q8 via the fourth common node P4.

[0091] Please refer to Figure 3, which is a waveform diagram of the first specific embodiment of the driving device for multiple fans of the present invention; please refer to Figure 4 , which is a waveform diagram of the first specific embodiment of the driving device for multiple fans of the present invention; and please also refer to Figure 2 .

[0092] In the time interval from time point t0 to time point t1, the controller 106 transmits a conduction signal 146 to the first transistor switch Q1 through the first control line M1L1 to drive the first transistor switch Q1, and also transmits a pulse width modulation signal 118 to the second transistor switch Q2 through the second control line M1L1PWM to drive the second transistor switch Q2. In addition, in the time interval from time point t0 to time point t1, the controller 106 does not conduct the third transistor switch Q3 and does not conduct the fourth transistor switch Q4. That is, in the time interval from time point t0 to time point t1, the controller 106 controls the first transistor switch Q1 and the second transistor switch Q2 through the conduction signal 146 and the pulse width modulation signal 118, respectively, to drive the first fan device 20.

[0093] In the time interval from time point t1 to time point t2, the controller 106 transmits the conduction signal 146 to the third transistor switch Q3 through the third control line M1L2 to drive the third transistor switch Q3, and further transmits the pulse width modulation signal 118 to the fourth transistor switch Q4 through the fourth control line M1L2PWM to drive the fourth transistor switch Q4. In addition, in the time interval from time point t1 to time point t2, the controller 106 does not conduct the first transistor switch Q1 and does not conduct the second transistor switch Q2. That is, in the time interval from time point t1 to time point t2, the controller 106 controls the third transistor switch Q3 and the fourth transistor switch Q4 through the conduction signal 146 and the pulse width modulation signal 118, respectively, to drive the first fan device 20.

[0094] In the time interval from time point t0 to time point t1, the controller 106 transmits the conduction signal 146 to the fifth transistor switch Q5 through the fifth control line M2L1 to drive the fifth transistor switch Q5, and transmits the pulse width modulation signal 118 to the sixth transistor switch Q6 through the sixth control line M2L1PWM to drive the sixth transistor switch Q6. In addition, in the time interval from time point t0 to time point t1, the controller 106 does not conduct the seventh transistor switch Q7 and does not conduct the eighth transistor switch Q8. That is, in the time interval from time point t0 to time point t1, the controller 106 controls the fifth transistor switch Q5 and the sixth transistor switch Q6 through the conduction signal 146 and the pulse width modulation signal 118, respectively, to drive the second fan device 30.

[0095] In the time interval from time point t1 to time point t2, the controller 106 transmits the conduction signal 146 to the seventh transistor switch Q7 through the seventh control line M2L2 to drive the seventh transistor switch Q7, and further transmits the pulse width modulation signal 118 to the eighth transistor switch Q8 through the eighth control line M2L2PWM to drive the eighth transistor switch Q8. In addition, in the time interval from time point t1 to time point t2, the controller 106 does not conduct the fifth transistor switch Q5 and the sixth transistor switch Q6. That is, in the time interval from time point t1 to time point t2, the controller 106 controls the seventh transistor switch Q7 and the eighth transistor switch Q8 through the conduction signal 146 and the pulse width modulation signal 118, respectively, to drive the second fan device 30.

[0096] Please refer to Figure 5 , which is a circuit diagram of a second specific embodiment of a driving device for multiple fans of the present invention. Figure 5 The components shown are described in Figure 1 For the sake of brevity, the similarities are not repeated here.

[0097] The first fan driving circuit 108 includes a first signal line 120, a second signal line 122, a first transistor switch Q1 and a second transistor switch Q2. The second fan driving circuit 110 includes a third signal line 124, a fourth signal line 126, a third transistor switch Q3 and a fourth transistor switch Q4.

[0098] The first signal line 120 is electrically connected to the controller 106; the second signal line 122 is electrically connected to the controller 106; the first transistor switch Q1 is electrically connected to the first signal line 120, the first fan device 20 and the protection and input interface circuit 114; the second transistor switch Q2 is electrically connected to the second signal line 122, the first fan device 20 and the first transistor switch Q1. In addition, the first transistor switch Q1 and the second transistor switch Q2 are electrically connected to a first common terminal P1, and the first fan device 20 is electrically connected to the first transistor switch Q1 and the second transistor switch Q2 via the first common terminal P1.

[0099] The third signal line 124 is electrically connected to the controller 106; the fourth signal line 126 is electrically connected to the controller 106; the third transistor switch Q3 is electrically connected to the third signal line 124, the second fan device 30 and the protection and input interface circuit 114; the fourth transistor switch Q4 is electrically connected to the fourth signal line 126, the second fan device 30 and the third transistor switch Q3. The third transistor switch Q3 and the fourth transistor switch Q4 are electrically connected at a second common node P2, and the second fan device 30 is electrically connected to the third transistor switch Q3 and the fourth transistor switch Q4 via the second common node P2.

[0100] Please refer to Figure 6 , which is a waveform diagram of a second specific embodiment of a driving device for multiple fans of the present invention; please refer to Figure 7 , which is a waveform diagram of a second specific embodiment of a driving device for multiple fans of the present invention; and please also refer to Figure 5 .

[0101] In the time interval from time point t0 to time point t1, the controller 106 transmits a pulse width modulation signal 118 to the first transistor switch Q1 through the first signal line 120 to drive the first transistor switch Q1. At this time, the controller 106 does not turn on the second transistor switch Q2. That is, in the time interval from time point t0 to time point t1, the controller 106 controls the first transistor switch Q1 through the pulse width modulation signal 118.

[0102] In the time interval from time point t1 to time point t2, the controller 106 transmits the pulse width modulation signal 118 to the second transistor switch Q2 through the second signal line 122 to drive the second transistor switch Q2. At this time, the controller 106 does not turn on the first transistor switch Q1. In other words, in the time interval from time point t1 to time point t2, the controller 106 controls the second transistor switch Q2 through the pulse width modulation signal 118 to drive the first fan device 20.

[0103] During the time interval from time point t0 to time point t1, the controller 106 transmits the pulse width modulation signal 118 to the third transistor switch Q3 through the third signal line 124 to drive the third transistor switch Q3. At this time, the controller 106 does not turn on the fourth transistor switch Q4.

[0104] In the time interval from time point t1 to time point t2, the controller 106 transmits the pulse width modulation signal 118 to the fourth transistor switch Q4 through the fourth signal line 126 to drive the fourth transistor switch Q4. At this time, the controller 106 does not turn on the third transistor switch Q3. That is, in the time interval from time point t1 to time point t2, the controller 106 controls the fourth transistor switch Q4 through the pulse width modulation signal 118 to drive the second fan device 30.

[0105] Please refer to Figure 8 , which is a circuit diagram of a third specific embodiment of a driving device for multiple fans of the present invention. Figure 8 The components shown are described in Figure 1 For the sake of brevity, the similarities are not repeated here.

[0106] The first fan driving circuit 108 includes a first driving line 128, a second driving line 130, a pulse width modulation signal transmission line 132, a first AND gate unit 134, a second AND gate unit 136, a first transistor switch Q1, a second transistor switch Q2, a third transistor switch Q3 and a fourth transistor switch Q4. The second fan driving circuit 110 includes a third driving line 138, a fourth driving line 140, a third AND gate unit 142, a fourth AND gate unit 144, a fifth transistor switch Q5, a sixth transistor switch Q6, a seventh transistor switch Q7 and an eighth transistor switch Q8.

[0107] The first driving line 128 is electrically connected to the controller 106; the second driving line 130 is electrically connected to the controller 106; the pulse width modulation signal transmission line 132 is electrically connected to the controller 106; the first AND gate unit 134 is electrically connected to the first driving line 128 and the pulse width modulation signal transmission line 132; the second AND gate unit 136 is electrically connected to the second driving line 130 and the pulse width modulation signal transmission line 132; the first transistor switch Q1 is electrically connected to the first driving line 128 and the pulse width modulation signal transmission line 132; The second transistor switch Q2 is electrically connected to the first AND gate unit 134, the first fan device 20 and the protection and input interface circuit 114; the third transistor switch Q3 is electrically connected to the second driving line 130, the first fan device 20 and the second transistor switch Q2; the fourth transistor switch Q4 is electrically connected to the second AND gate unit 136, the first fan device 20, the protection and input interface circuit 114 and the first transistor switch Q1. In addition, the second transistor switch Q2 and the third transistor switch Q3 are electrically connected to a first common terminal P1, and the first fan device 20 is electrically connected to the second transistor switch Q2 and the third transistor switch Q3 through the first common terminal P1. The first transistor switch Q1 and the fourth transistor switch Q4 are electrically connected to a second common terminal P2, and the first fan device 20 is electrically connected to the first transistor switch Q1 and the fourth transistor switch Q4 through the second common terminal P2.

[0108] The third driving line 138 is electrically connected to the controller 106; the fourth driving line 140 is electrically connected to the controller 106; the third AND gate unit 142 is electrically connected to the third driving line 138 and the pulse width modulation signal transmission line 132; the fourth AND gate unit 144 is electrically connected to the fourth driving line 140 and the pulse width modulation signal transmission line 132; the fifth transistor switch Q5 is electrically connected to the third driving line 138 and the second fan device 30; the sixth transistor switch Q6 is electrically connected to the third AND gate unit 142, the second fan device 30 and the protection and input interface circuit 114; the seventh transistor switch Q7 is electrically connected to the fourth driving line 140, the second fan device 30 and the sixth transistor switch Q6; the eighth transistor switch Q8 is electrically connected to the fourth AND gate unit 144, the second fan device 30, the protection and input interface circuit 114 and the fifth transistor switch Q5. In addition, the sixth transistor switch Q6 and the seventh transistor switch Q7 are electrically connected to a third common node P3, and the second fan device 30 is electrically connected to the sixth transistor switch Q6 and the seventh transistor switch Q7 via the third common node P3. The fifth transistor switch Q5 and the eighth transistor switch Q8 are electrically connected to a fourth common node P4, and the second fan device 30 is electrically connected to the fifth transistor switch Q5 and the eighth transistor switch Q8 via the fourth common node P4.

[0109] Please refer to Fig. 9 , which is a waveform diagram of the third specific embodiment of the driving device for multiple fans of the present invention; please refer to Fig.10 , which is a waveform diagram of the third specific embodiment of the driving device for multiple fans of the present invention; and please also refer to Figure 8 .

[0110] The controller 106 transmits a PWM signal 118 to the first AND gate unit 134 , the second AND gate unit 136 , the third AND gate unit 142 , and the fourth AND gate unit 144 through the PWM signal transmission line 132 .

[0111] In the time interval from time point t0 to time point t1, the controller 106 transmits a conduction signal 146 to the first transistor switch Q1 and the first AND gate unit 134 through the first driving line 128. At this time, the first transistor switch Q1 is driven, and the first AND gate unit 134 outputs a first driving signal S1 to drive the second transistor switch Q2 according to the pulse width modulation signal 118 and the conduction signal 146. In addition, in the time interval from time point t0 to time point t1, the controller 106 does not transmit the conduction signal 146 to the third transistor switch Q3 and the second AND gate unit 136, so that the third transistor switch Q3 and the fourth transistor switch Q4 are not turned on. That is, in the time interval from time point t0 to time point t1, the controller 106 controls the first transistor switch Q1 and the second transistor switch Q2 through the conduction signal 146 and the pulse width modulation signal 118 to drive the first fan device 20.

[0112] In the time interval from time point t1 to time point t2, the controller 106 transmits the conduction signal 146 to the third transistor switch Q3 and the second AND gate unit 136 through the second driving line 130. At this time, the third transistor switch Q3 is driven, and the second AND gate unit 136 outputs a second driving signal S2 to drive the fourth transistor switch Q4 according to the pulse width modulation signal 118 and the conduction signal 146. In addition, in the time interval from time point t1 to time point t2, the controller 106 does not transmit the conduction signal 146 to the first transistor switch Q1 and the first AND gate unit 134, so that the first transistor switch Q1 and the second transistor switch Q2 are not turned on. That is, in the time interval from time point t1 to time point t2, the controller 106 drives the third transistor switch Q3 and the fourth transistor switch Q4 through the conduction signal 146 and the pulse width modulation signal 118 to drive the first fan device 20.

[0113] In the time interval from time point t0 to time point t1, the controller 106 transmits the conduction signal 146 to the fifth transistor switch Q5 and the third AND gate unit 142 through the third driving line 138. At this time, the fifth transistor switch Q5 is driven, and the third AND gate unit 142 outputs a third driving signal S3 to drive the sixth transistor switch Q6 according to the pulse width modulation signal 118 and the conduction signal 146. In addition, in the time interval from time point t0 to time point t1, the controller 106 does not transmit the conduction signal 146 to the seventh transistor switch Q7 and the fourth AND gate unit 144, so that the seventh transistor switch Q7 and the eighth transistor switch Q8 are not turned on. That is, in the time interval from time point t0 to time point t1, the controller 106 drives the fifth transistor switch Q5 and the sixth transistor switch Q6 through the conduction signal 146 and the pulse width modulation signal 118 to drive the second fan device 30.

[0114] In the time interval from time point t1 to time point t2, the controller 106 transmits the conduction signal 146 to the seventh transistor switch Q7 and the fourth AND gate unit 144 through the fourth driving line 140. At this time, the seventh transistor switch Q7 is driven, and the fourth AND gate unit 144 outputs a fourth driving signal S4 to drive the eighth transistor switch Q8 according to the pulse width modulation signal 118 and the conduction signal 146. In addition, in the time interval from time point t1 to time point t2, the controller 106 does not transmit the conduction signal 146 to the fifth transistor switch Q5 and the third AND gate unit 142, so that the fifth transistor switch Q5 and the sixth transistor switch Q6 are not turned on. That is, in the time interval from time point t1 to time point t2, the controller 106 controls the seventh transistor switch Q7 and the eighth transistor switch Q8 through the conduction signal 146 and the pulse width modulation signal 118 to drive the second fan device 30.

[0115] Figure 5 The driving circuit in is a half-bridge driver. Figure 8 and Figure 2 The driving circuit in is a full-bridge drive. Figure 8 The controller 106 shown only needs two output pins to output the conduction signal 146 and the pulse width modulation signal 118. This can realize the control of multiple fan devices (such as Figure 8 The first fan device 20 and the second fan device 30). Figure 8 The controller 106 shown has fewer pins than Figure 2 The number of pins of the controller 106 is shown, so Figure 8 The controller 106 shown is relatively easy to design.

[0116] The invention has the effect of reducing the cost and volume of the driving device of multiple fans.

[0117] However, the above is only a preferred embodiment of the present invention, which cannot limit the scope of the present invention. That is, all equivalent changes and modifications made according to the claims of the present invention should still fall within the scope of the patent coverage of the present invention. The present invention can also have many other embodiments. Without departing from the spirit and essence of the present invention, technicians familiar with the field can make various corresponding changes and deformations according to the present invention, but these corresponding changes and deformations should fall within the scope of protection of the claims attached to the present invention. In summary, it should be known that the present invention has industrial applicability, novelty and advancement, and the structure of the present invention has never been seen in similar products and public use. It fully meets the requirements for invention patent applications and is applied for in accordance with the Patent Law.

Claims

1. A driving device for multiple fans, for driving a first fan device and a second fan device, comprising: a controller; a first fan driving circuit, the controller controls the first fan driving circuit to drive the first fan device; a second fan driving circuit, the controller controls the second fan driving circuit to drive the second fan device; and a protection and input interface circuit, the protection and input interface circuit is directly electrically connected to the first fan driving circuit and the second fan driving circuit, and is used to protect the first fan driving circuit and the second fan driving circuit; Wherein, the first fan driving circuit comprises: a first signal line electrically connected to the controller; a second signal line electrically connected to the controller; a first transistor switch, the first transistor switch being electrically connected to the first signal line, the first fan device and the protection and input interface circuit; and a second transistor switch, the second transistor switch being electrically connected to the second signal line, the first fan device and the first transistor switch and being grounded, The second fan driving circuit comprises: a third signal line electrically connected to the controller; a fourth signal line electrically connected to the controller; a third transistor switch, the third transistor switch being electrically connected to the third signal line, the second fan device and the protection and input interface circuit; and a fourth transistor switch, the fourth transistor switch being electrically connected to the fourth signal line, the second fan device and the third transistor switch and being grounded, Wherein, in different time intervals, the controller transmits a pulse width modulation signal to the first transistor switch and the third transistor switch, or to the second transistor switch and the fourth transistor switch, respectively, through the first signal line, the second signal line, the third signal line and the fourth signal line alternately, so as to control the first transistor switch and the third transistor switch or the second transistor switch and the fourth transistor switch, respectively, in different time intervals by using a half-bridge drive, so as to drive the first fan device and the second fan device, The first crystal switch and the second crystal switch are configured with opposite polarities and the pulse width modulation signals transmitted in the first crystal switch and the second crystal switch are not complementary, and the third crystal switch and the fourth crystal switch are configured with opposite polarities and the pulse width modulation signals transmitted in the third crystal switch and the fourth crystal switch are not complementary.

2. The driving device for multiple fans according to claim 1, characterized in that: When the controller transmits the pulse width modulation signal to the first transistor switch through the first signal line to drive the first transistor switch, the controller does not transmit the pulse width modulation signal to the second transistor switch, so that the second transistor switch is not turned on and the first fan device is driven; When the controller transmits the pulse width modulation signal to the second transistor switch through the second signal line to drive the second transistor switch, the controller does not transmit the pulse width modulation signal to the first transistor switch, so that the first transistor switch is not turned on and the first fan device is driven.

3. The driving device for multiple fans according to claim 2, characterized in that: When the controller transmits the pulse width modulation signal to the third transistor switch through the third signal line to drive the third transistor switch, the controller does not transmit the pulse width modulation signal to the fourth transistor switch, so that the fourth transistor switch is not turned on and the second fan device is driven; When the controller transmits the pulse width modulation signal to the fourth transistor switch through the fourth signal line to drive the fourth transistor switch, the controller does not transmit the pulse width modulation signal to the third transistor switch, so that the third transistor switch is not turned on and the second fan device is driven.

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