TWI399167B - Dust-disposal double fan heat-dissipation device and control circuit and fin set thereof - Google Patents

Description

Dual fan heat sink with dust removal function and its control circuit and fin set

The invention relates to a heat sink with a double fan, in particular to a double fan heat sink with a dust removing function.

Taiwan Patent No. 371,497 discloses a dual fan heat sink which can be placed on a system body such as a notebook computer to achieve a proper heat dissipation effect. The heat sink mainly comprises two fans and a fan drive control device. One of the fans is responsible for introducing the external airflow into a system body; the other fan is responsible for discharging the airflow within the system body. The fan drive control device is for alternately driving the two fans to operate. That is, when one of the fans rotates, the other fan stops and alternately operates, the purpose of which is to avoid a resonance situation that may occur when the dual fan dissipates heat to the notebook computer, thereby reducing noise. However, the Taiwan patented dual fan heat sink does not have a dust removal function.

U.S. Patent No. 7,630,201 discloses a dual-fan heat-dissipating module in which two fans are alternately operated in opposite directions to dissipate heat from a radiator. However, the dual fans cannot operate at the same time to dissipate heat from the heat sink.

The present invention provides a dual fan type heat dissipating device having a dust removing function, which mainly includes a fin group, a wind hood, a first fan, a second fan, and a control circuit. The fin set includes a plurality of fins side by side. The hood includes a main board that covers the top of the fin set. The first fan is disposed on the hood and can generate wind to the top front section of the fin set after being activated. The second fan is disposed on the hood and can generate wind to the top rear section of the fin set after being activated. The control circuit can start the first and second fans after receiving a working signal, and after receiving a dust removal signal, perform the following steps in sequence:

(a) activating the first fan and simultaneously turning off the second fan; and

(b) starting the second fan and simultaneously turning off the first fan;

The steps (a) and (b) are maintained for a predetermined period of time.

With the control circuit, the first fan can be in the step (a)

The fin set is dissipated while the fin set and the second fan are dedusted. The second fan can dissipate the fin set in the step (b), and can also perform dust removal on the fin set and the first fan. More specifically, in the foregoing process, the rotation directions of the first and second fans are always consistent, and no reverse rotation is required.

Preferably, the control circuit can also start the first and second fans simultaneously after performing the step (a), and then perform the step (b). In this way, it is possible to avoid the occurrence of the situation in which both the first and second fans are not operating at the same time between the steps (a) and (b).

In addition to the contact surface, the bottom portion of the fin set of the present invention has a front bevel surface and a rear inclined surface respectively located in front of and behind the contact surface, and the front bevel surface is inclined to the first fan. And the rear slope is inclined to the second fan, wherein the front and rear slopes are inclined toward the contact surface. In this way, the rear bevel can guide the wind to the second fan in the step (a), and the front bevel can guide the wind to the first fan in the step (b).

Other inventive aspects and more detailed technical and functional descriptions of the present invention are disclosed in the following description.

The first and second figures show a preferred embodiment of the present invention, which discloses a dual fan type heat dissipating device having a dust removing function, including a first fan 1, a second fan 2, a windshield 3, and a fin set 4. And a control circuit 5, wherein the control circuit 5 is integrated in a circuit on the circuit board 8.

As shown in the first figure, the fin set 4 has a plurality of fins 40 spaced side by side along a lateral direction X such that a channel is formed between each of the two fins 40. The windshield 3 includes a main board 30 and two side plates 31 respectively connected to opposite sides of the main board 30. The main board 30 covers the top of the fin set 4 and defines two spaced apart along a longitudinal direction. Through holes 301 and 302.

The first fan 1 is located in the through hole 301 of the hood 3, and after being activated, generates wind to the top front section of the fin set 4. The second fan 2 is located in the other through hole 302 of the hood 3, and after being activated, generates wind to the top rear section of the fin set 4.

The control circuit 5 is mainly composed of a microcontroller and some transistor switching circuits, and its features will be described later.

As shown in the second figure, the bottom of the fin set 4 has a contact surface 41. The contact surface 41 is for contacting a heat source 6. In this example, the heat source 6 refers to a heat transfer block 61 and some heat pipes of the heat pipe 7 (Heat Pipe). The heat source 6 can also be a CPU, a GPU, or other component that requires heat dissipation.

The third figure shows that the contact surface 41 of the fin set 4 is in contact with the heat source 6, and the heat conducting block 61 of the heat source 6 is a wafer 80 that abuts against the circuit board 8. Thus, the heat generated by the operation of the wafer 80 is quickly absorbed by the heat conducting block 61 and the heat pipes 7 onto the fin set 4 for heat dissipation.

In the third to fifth figures, the circuit board 8 is a computer display card inside a computer host, the chip 80 is a GPU on the computer display card, and the control circuit 5 is integrated on the circuit board 8. In the upper circuit, and the control circuit 5 is connected to the first and second fans 1, 2, and controls whether the power supply on the circuit board 8 supplies power to the first and second fans 1, 2, and selectively activates or turns off. The purpose of the first and second fans 1, 2. The main point is that the control circuit 5 is designed to activate the first and second fans 1, 2 after receiving a working signal, and after receiving a dust removal signal, sequentially perform the following steps:

(a) starting the first fan 1, and simultaneously turning off the second fan 2;

(b) starting the second fan 2, and simultaneously turning off the first fan 1;

The steps (a) and (b) are maintained for a predetermined period of time, such as tens of seconds or minutes.

There are various options for generating the working signal. For example, if a user presses a button on the host computer (for example, a power button), or presses a quick button on a keyboard connected to one of the computer hosts, the computer host corresponds to This work signal is generated. In addition, a computer program can also be used to drive the computer host to generate the working signal. In addition, a temperature detector can also detect the internal temperature of the host computer, and after the temperature reaches a predetermined value, the working signal is generated by the host computer.

Similarly, the dusting signal is generated in various ways, such as when the user presses another button on the host computer (for example, a dedicated dust-removing button), or presses another quick key on the keyboard. The host correspondingly generates the dust removal signal. In addition, a computer program can be used to drive the host computer to generate the dust removal signal. In addition, the operation time of the first fans 1, 2 may be accumulated, and the dust removal signal may be generated after the accumulated arrival reaches a predetermined value.

In any case, after the control circuit 5 receives the operation signal, the first and second fans 1, 2 are immediately activated, that is, the power supply is allowed to be supplied to the first and second fans 1, 2, so that The operation produces a wind flow as indicated by the arrow in the third figure. This means that the first and second fans 1, 2 are currently in a normal working state, and the circuit board 8 and the wafer 80 are dissipated. According to the direction of the wind flow indicated by the arrow in the third figure, after the first and second fans 1 and 2 are operated for a period of time, the particles A (such as dust or dander, etc.) coming with the wind will be retained. The windward side of the fin set 4, that is, the front side top 40a and the rear top side 40b of the fins 40. In addition, a large number of particles (not shown) are accumulated on the blades of the first and second fans 1, 2.

In particular, after the control circuit 5 receives the dust removal signal, the above two steps (a) and (b) are sequentially performed to clear those particles. First, in the step (a), since the first fan 1 is activated by the control circuit 5, and the second fan 2 is turned off by the control circuit 5, the operation is stopped. The first fan 1 produces a wind flow as indicated by the arrow in the fourth figure. According to the flow direction of the wind flow, the particles A originally accumulated on the top edge 40b of the rear portion of the fins 40 and the particles originally accumulated on the blades of the second fan 2 are all used by the first fan 1 The resulting wind blows away. At this time, the first fan 1 is performing the dust removal work while still performing the heat dissipation work.

Next, in the step (b), the first fan 1 is turned off by the control circuit 5 and its operation is stopped, and the second fan 2 is started by the control circuit 5 to start operation. Therefore, the second fan 2 generates a wind flow as indicated by an arrow in the fifth figure. According to the flow direction of the wind flow, the particles A originally accumulated on the top edge 40a of the front portion of the fins 40, and the particles accumulated on the blades of the first fan 1 are all used by the second fan 2 The resulting wind blows away. At this time, the second fan 2 is performing the dust removal work while still performing the heat dissipation work.

As can be seen from the above description, the computer host generates the dust removal signal, and the control circuit 5 drives the first and second fans 1 and 2 to perform the dust removal operation in turn by performing the steps (a) and (b). The control circuit 5 can also continuously perform the steps (a) and (b) for a period of time if necessary. In any case, it can be seen from the above description that the operation of the first and second fans 1 and 2 is controlled by the control circuit 5, and the fin group 4 and the first and second fans 1 and 2 can be kept clean at all times. It may or may not be easy to accumulate particles, which has a positive impact on the heat dissipation efficiency of the entire heat sink.

It should be noted that after the two fan systems 1 and 2 of the present invention are activated by the control circuit 5, they are operated in the same rotation direction to dissipate the fin group 4, and during dust removal, in operation. The fan 1 or 2 is still operated in the original direction of rotation for dust removal and heat dissipation, which is significantly different from the conventional technique of using fan reversal to remove dust.

Furthermore, during the alternation of the steps (a) and (b), the first and second fans 1, 2 may not operate for a short period of time (this may be caused by a delay in circuit response). ). This situation is sometimes mistaken for a fault. Based on this consideration, the control circuit 5 can be further designed to start the first and second fans 1, 2 simultaneously after the step (a) is performed. Then perform the step (b). In this way, the occurrence of the situation in which both the first and second fans 1 and 2 are not operating at the same time can be completely avoided.

Further, in the above description, the control circuit 5 is integrated in the circuit of the computer display card, however, the control circuit 5 may be selected to be integrated in the motherboard circuit of the computer main body. The advantage of the foregoing integration is that the control circuit 5 can utilize the resources on the computer display card circuit or the motherboard circuit, for example, by using the GPU on the computer display card or part of the function of the CPU on the motherboard, instead of the control circuit. The function of the microcontroller in 5. However, the control circuit 5 can also be an independent circuit module.

As shown in the second figure, the front and rear sections of the bottom of the fin set 4 further have a front bevel 42 and a rear bevel 43 respectively. The contact surface 41 is located between the front and rear bevels 42, 43 and the front The rear bevels 42, 43 are all inclined toward the contact surface 41. Preferably, the fin set 4 is formed by laterally joining the fins 40. Each of the fins 40 is substantially made of stamping copper or aluminum, and includes a substrate 401 and respectively A film 402, a front bevel 403, and a back bevel 404 extend from the substrate 401. The backsheets 402 of the fins 40 together form the contact surface 41. The front bevels 403 of the fins 40 together form the front bevel 42 and the second diagonals 404 of the fins 40 together form the rear bevel 43. In any event, this is only one of the preferred embodiments of the fin set 4, and in practice the fin set 4 can alternatively be fabricated in an aluminum extrusion.

The front inclined surface 42 of the fin set 4 is inclined to the first fan 1 , and the rear inclined surface 43 is inclined to the second fan 2 , and the rear inclined surface 43 is used to assist the wind to guide the second fan 2 . , as shown in the fourth picture. The front bevel 42 of the fin set 4 is used to assist in directing the wind to the first fan 1, as shown in the fifth figure. However, both the front bevel 42 and the rear bevel 43 are unnecessary.

In any event, anyone can obtain sufficient teaching from the description of the above examples, and it is understood that the present invention is indeed different from the prior art, and is industrially usable and progressive. It is the invention that has indeed met the patent requirements and has filed an application in accordance with the law.

1. . . First fan

2. . . Second fan

3. . . wind cover

30. . . Motherboard

31. . . Side panel

301, 302. . . Through hole

4. . . Fin set

40. . . Fin

40a. . . Front edge

40b. . . Rear section

401. . . Substrate

402. . . Negative film

403. . . Anterior oblique

404. . . Posterior oblique

41. . . Contact surfaces

42. . . Front bevel

43. . . Rear bevel

5. . . Control circuit

6. . . Heat source

61. . . Thermal block

7. . . Heat pipe

8. . . Circuit board

80. . . Wafer

A. . . particle

The first figure shows a preferred embodiment of the invention.

The second figure shows the fin set in the preferred embodiment.

The third figure is used to indicate the wind flow path of the preferred embodiment in a normal operating state.

The fourth figure is used to indicate that the preferred embodiment is in the air flow path when the second fan 2 is dusted.

The fifth figure is used to indicate that the preferred embodiment is in the air flow path when the first fan 1 is dusted.

1. . . First fan

2. . . Second fan

3. . . wind cover

30. . . Motherboard

31. . . Side panel

301, 302. . . Through hole

4. . . Fin set

40. . . Fin

5. . . Control circuit

8. . . Circuit board

80. . . Wafer

Claims (4)

A heat dissipating device includes: a fin set including a plurality of fins arranged side by side along a lateral direction, and a bottom of the fin set has a contact surface for contacting a heat source, and a top of the fin set has a recessed one a top edge and a rear edge; a windshield comprising a main board, the main board covers the top of the fin set, and has two through holes arranged along a longitudinal direction, and the hood is along the lateral direction Exposing the fin group to the side; a first fan is located in one of the through holes of the hood, and corresponds to the top edge of the front portion of the fin group, and after being activated, generates wind to the front portion of the fin group a top side; a second fan located in the other through hole of the hood, and corresponding to the top edge of the rear section of the fin set, and after being activated, generating wind to the top edge of the rear section of the fin set; a control circuit capable of starting the first and second fans after receiving a working signal, and after receiving a dust removal signal, performing the following steps in sequence: (a) starting the first fan and simultaneously closing Dropping the second fan; and (b) starting the second fan, Simultaneously turning off the first fan; wherein the steps (a) and (b) are maintained for a predetermined period of time, wherein the control circuit starts the first and second fans simultaneously after performing the step (a), and then Perform step (b). The heat sink according to claim 1, wherein the heat sink is The bottom of the fin set further has a front bevel and a rear inclined surface respectively located at the front and the rear of the contact surface, and the front bevel is inclined to the first fan, and the rear bevel is inclined to the ground. The two fans, wherein the front and rear slopes are inclined toward the contact surface. A control circuit is configured to connect a first fan and a second fan, and after receiving a working signal, activate the first and second fans, and after receiving a dust removal signal, sequentially execute the following Step: (a) starting the first fan and simultaneously turning off the second fan; and (b) starting the second fan and simultaneously turning off the first fan; wherein the steps (a) and (b) are Maintaining for a predetermined period of time, wherein the control circuit starts the first and second fans simultaneously after performing the step (a), and then performs the step (b). A fin assembly includes a plurality of fins arranged side by side along a lateral direction, wherein a top portion of the fin set has a concave top edge and a rear top edge, and a bottom of the fin set has a contact surface, a front bevel and a rear bevel, the contact surface is for contacting a heat source and located between the front and rear bevels, the front and rear bevels are inclined to the contact surface, wherein the front bevel corresponds to the top edge of the front segment, The rear bevel corresponds to the top edge of the rear section.