CN201044098Y

CN201044098Y - Fan running state indicating circuit

Info

Publication number: CN201044098Y
Application number: CNU2007200028093U
Authority: CN
Inventors: 冯渤
Original assignee: THERMALRIGHT Inc
Current assignee: THERMALRIGHT Inc
Priority date: 2007-01-26
Filing date: 2007-01-26
Publication date: 2008-04-02
Anticipated expiration: 2017-01-26

Abstract

The invention is an instruction circuit of a fan running state and comprises a switch unit and an instruction light unit. The switch unit is controlled by a pulse wave width modulation signal adjusting the running speed of a radiator fan in order to present alternant conducting or closing state. The instruction light changes a cresset according to the conducting or closing state of the switch unit, so the cresset changing frequency of the instruction light unit is relative to the running speed of the radiator fan, which instructs the running state of the radiator fan for users.

Description

The indicating circuit of fan operating state

Technical field

This creation is about a kind of indicating circuit, refers to a kind of radiator fan that is used for especially, to point out the indicating circuit of present fan operating state.

Background technology

Computing machine is the electronic product that is widely used most at present, the use of right computing machine is no doubt convenient, during only owing to the processing mass data, CPU (central processing unit) (Central Processing Unit) was easy to produce overheated phenomenon because of handling multidata in the computing machine, therefore the radiating effect of the CPU (central processing unit) important key that can computing machine normal operation often, generally mostly be on CPU (central processing unit), to be equiped with in addition a heating radiator, with the heat radiator on the heating radiator with thermal energy conduction that CPU (central processing unit) was produced to a plurality of radiating fins, utilize the radiator fan blow air to flow again, and with the heat energy loss on the radiating fin; Only the rotating speed of radiator fan mostly is fixing, and can't be according to the temperature variation rotating speed of CPU (central processing unit), to reach best radiating effect.

For solving above-mentioned shortcoming, have temperature measuring function at present newer CPU (central processing unit) is many, hardware state in the coupled computer detects (Hardware Monitor) chip and can detect the temperature of CPU (central processing unit), and to the temperature that should detect and control a PWM (Pulse Width Modulation: signal pulse wave width modulation), the work period of this pulse wave width modulation signal (Duty Cycle) is in order to adjust the rotational frequency of radiator fan, more little when the work period of pulse wave width modulation signal, then the rotational frequency of radiator fan is high more, the high more rotating speed of promptly representing of the rotational frequency of radiator fan is fast more, reaches the purpose of the temperature change radiating fan rotation speed of corresponding CPU (central processing unit) thus.

It is right because general radiator fan and CPU (central processing unit) are to be arranged in the computer housing, therefore the computing machine user has no way of learning the temperature of CPU (central processing unit), so how can be by understanding the working order of fan, and can further make the computing machine user understand the state of temperature of CPU (central processing unit), with reduce CPU (central processing unit) generation problems of excessive heat may, must for industry institute must emphasis developing direction.

Summary of the invention

Understand the operating condition of radiator fan in the computing machine for prompting computing machine user, the fundamental purpose of this creation is providing a kind of indicating circuit of fan operating state, for reaching the major technique means that aforementioned purpose takes is to make aforementioned indicating circuit connect the pulse wave width modulation signal source of a control radiator fan running, and this indicating circuit comprises:

One switch element, be to connect this pulse wave width modulation signal source, the keying of this switch element of pulse wave width modulation signal change that is sent by this pulse wave width modulation signal source, wherein the work period of this pulse wave width modulation signal is in order to adjust the rotational frequency of radiator fan;

One indicator unit is to be connected between an aforementioned switches unit and the power supply, controls described indicator unit by the keying of this switch element and changes cresset with the prompting user.

Utilize above-mentioned technological means, the indicator unit of this creation can cooperate the work period of pulse wave width modulation signal, is subjected to switch element control and the change cresset, reaches the purpose of prompting computing machine user radiator fan operating condition thus.

Description of drawings

Fig. 1: the functional block diagram that is this creation.

Fig. 2: be this equivalent circuit diagram of creating first embodiment.

Fig. 3: be this equivalent circuit diagram of creating second embodiment.

The primary clustering symbol description

(10) pulse wave width modulation signal source (20) radiator fan

(30) indicating circuit

(31) switch element (32) indicator unit

(311) dichromatic LED (40) power supply

Embodiment

See also shown in Figure 1, the indicating circuit of this creation fan operating state (30) is to connect a pulse wave width modulation (PWM) signal source (10), this pulse wave width modulation signal source (10) is in order to controlling the running speed of a radiator fan (20), and this indicating circuit comprises:

One switch element (31), be to connect this pulse wave width modulation signal source (10), the keying of the described switch element of pulse wave width modulation signal change (31) that is sent by this pulse wave width modulation signal source (10), wherein the work period of this pulse wave width modulation signal (Duty Cycle) is in order to adjust the rotational frequency (promptly being the inverse of the work period of pulse wave width modulation signal) of radiator fan (20);

One indicator unit (32), be to be connected between an aforementioned switches unit (31) and the power supply (40), by the keying of this switch element (31) control described indicator unit (32) whether light/extinguish or the cresset that changes described indicator unit (32) with the prompting user.

And about first embodiment of this creation, see also shown in Figure 2, wherein:

This switch element (31) mainly is to comprise a transistor (Q1) and an electric capacity (C17), the base stage of this transistor (Q1) is to connect pulse wave width modulation signal source (10) and emitter grounding, and this electric capacity (C17) be the collection utmost point that connects transistor (Q1) with the ground end with filter away high frequency noise;

This indicator unit (32) mainly is to comprise a plurality of single color LEDs (LD1)～(LD3), these a plurality of single color LEDs (LD1)～(LD3) are to be connected in series in regular turn and to form a light emitting diode string, and the single color LED at these light emitting diode string two ends (LD1) is the collection utmost point that connects power supply (40) and aforementioned transistor (Q1) respectively (LD3).

Below sincerely be described further at the principle of work of above-mentioned first embodiment:

When this pulse wave width modulation signal source (10) is not sent the pulse wave width modulation signal, the base stage of transistor (Q1) is equal to reception one low level signal, therefore transistor (Q1) can conducting, so these a plurality of single color LEDs (LD1)～(LD3) are can conducting not luminous;

When this pulse wave width modulation signal source (10) is sent the pulse wave width modulation signal, this transistor (Q1) will according to the work period conducting of this pulse wave width modulation signal with end, because (LD1)～(LD3) also conducting is luminous for this single color LED during transistor (Q1) conducting, so this single color LED (LD1)～(LD3) is the work period light on and off according to this pulse wave width modulation signal;

When the very high frequency of this single color LED (LD1)～(LD3) light on and off when (for example 25kHz), because human eye has the characteristic of persistence of vision, therefore human eye can not felt the light on and off of this single color LED (LD1)～(LD3), and the frequency of working as single color LED (LD1)～(LD3) light on and off is high more, and the brightness that human eye is experienced also can be high more.

From the above, the frequency of single color LED (LD1)～(LD3) light on and off is high more, the work period of then representing the pulse wave width modulation signal is more little, the work period of pulse wave width modulation signal, the more little rotation speed of the fan of promptly representing was fast more, hence one can see that, and rotation speed of the fan is fast more, this single color LED (LD1)～(LD3) will be bright more, if rotation speed of the fan is slow more, then this single color LED (LD1)～(LD3) is darker, so can help the computing machine user to pass through to observe the brightness of this single color LED (LD1)～(LD3) to judge the rotating speed of radiator fan.

In addition about second embodiment of this creation, see also shown in Figure 3, wherein:

This switch element (31) mainly is to comprise a first transistor (Q2), one first electric capacity (C6), one transistor seconds (Q3) and one second electric capacity (C9), the base stage of this first transistor (Q2) is to connect pulse wave width modulation signal source (10) and emitter grounding, this first electric capacity (C6) then connects the collection utmost point of transistor (Q2) and power supply (40) with filter away high frequency noise, the base stage of this transistor seconds (Q3) is the collection utmost point that connects the first transistor (Q2) in addition, the emitter grounding of transistor seconds (Q3), this second electric capacity (C9) then connect the collection utmost point of transistor seconds (Q3) and power supply (40) with filter away high frequency noise;

This indicator unit (32) mainly is to comprise a plurality of dichromatic LEDs (311), each dichromatic LED (311) includes one first single color LED (D1) and one second single color LED (D2), this first single color LED (D1) can send ruddiness in present embodiment, and second single color LED (D2) is to send blue light; Wherein first single color LED (D1) of these a plurality of dichromatic LEDs (311) is and second electric capacity (C9) is parallel between the collection utmost point and power supply (40) of transistor seconds (Q3), and second single color LED (D2) of these a plurality of dichromatic LEDs (311) is and first electric capacity (C6) is parallel between the collection utmost point and power supply (40) of the first transistor (Q2).

The principle of work of above-mentioned second embodiment is as described below:

When this pulse wave width modulation signal source (10) is not sent the pulse wave width modulation signal, this the first transistor (Q2) is equal to the lasting low level signal that receives, therefore the first transistor (Q2) can conducting, so second single color LED (D2) of these a plurality of dichromatic LEDs (311) can be not shinny; And because not conducting of the first transistor (Q2), therefore the base stage of this transistor seconds (Q3) is equal to high levle signal input, make transistor seconds (Q3) conducting, so ruddiness is sent in first single color LED (D1) conducting of these a plurality of dichromatic LEDs (311);

When this pulse wave width modulation signal source (10) is sent the pulse wave width modulation signal, this the first transistor (Q2) is according to the work period conducting of this pulse wave width modulation signal and ends, when the first transistor (Q2) conducting, the also conducting and send blue light of second single color LED (D2) of these a plurality of dichromatic LEDs (311), this transistor seconds this moment (Q3) then according to a work period conducting opposite with the work period of this pulse wave width modulation signal with end, so first single color LED (D1) of these a plurality of dichromatic LEDs (311) and second single color LED (D2) are with alternately light on and off.

From the above, the single color LED (D1) of these a plurality of dichromatic LEDs (311) is the work period of complying with this pulse wave width modulation signal to replace light on and off (D2), when the work period of pulse wave width modulation signal is big, to present blue light and ruddiness checker more significantly, and when work period of pulse wave width modulation signal hour, then can present the light of ruddiness and blue light; Thus, the computing machine user can be according to the rotating speed speed of the difference understanding radiator fan of the institute's indicator unit of looking (32) color, and then learns the height of CPU (central processing unit) temperature.

Claims

1. the indicating circuit of a fan operating state is the pulse wave width modulation signal source that connects a control radiator fan running, it is characterized in that this indicating circuit comprises:

One switch element is to connect this pulse wave width modulation signal source, the keying of the described switch element of a pulse wave width modulation signal change that is sent by this pulse wave width modulation signal source;

2. the indicating circuit of fan operating state according to claim 1 is characterized in that:

This switch element mainly is to comprise a transistor and an electric capacity, and this transistorized base stage is to connect pulse wave width modulation signal source and emitter grounding, and this electric capacity is to connect the transistorized collection utmost point to hold with filter away high frequency noise with ground;

This indicator unit mainly is to comprise a plurality of single color LEDs, luminous two diodes of these a plurality of monochromes are to be connected in series in regular turn and to form a light emitting diode string, and the single color LED at these light emitting diode string two ends is to connect the power supply and the aforementioned transistorized collection utmost point respectively.

3. the indicating circuit of fan operating state according to claim 1 is characterized in that:

This switch element mainly is to comprise a first transistor, one first electric capacity, a transistor seconds and one second electric capacity, the base stage of this first transistor is to connect pulse wave width modulation signal source and emitter grounding, this first electric capacity then connects the transistorized collection utmost point and power supply with filter away high frequency noise, in addition the base stage of this transistor seconds is the collection utmost point and the emitter grounding that connects the first transistor, and this second electric capacity then connects the collection utmost point of transistor seconds and power supply with filter away high frequency noise;

This indicator unit mainly is to comprise a plurality of dichromatic LEDs, each dichromatic LED and in have one first single color LED and one second single color LED, wherein first single color LED of these a plurality of dichromatic LEDs is and second electric capacity is parallel between the collection utmost point and power supply of transistor seconds, and second single color LED of these a plurality of dichromatic LEDs is and first electric capacity is parallel between the collection utmost point and power supply of the first transistor.