CN201420668Y

CN201420668Y - Fan fault detection device

Info

Publication number: CN201420668Y
Application number: CN2009200542809U
Authority: CN
Inventors: 邹曙; 梁远文
Original assignee: Dongguan Guanjia Electronic Equipment Co Ltd
Current assignee: Dongguan Guanjia Electronic Equipment Co Ltd
Priority date: 2009-04-10
Filing date: 2009-04-10
Publication date: 2010-03-10
Anticipated expiration: 2019-04-10

Abstract

The utility model relates to detection device technical field, in particular to a fan fault detection device which comprises a dc power supply module, a pull-up resistor and a digital signal processor; the positive electrode output end of the dc power supply module is connected with the positive electrode power supply input ends of a plurality of fans, the negative electrode output end of the dc power supply module is connected with the negative electrode power supply input ends of the fans, one end of the pull-up resistor is connected with the positive electrode power supply input ends of thefans, the other end of the pull-up resistor is connected with the signal output ends of the fans, the signal output ends of the fans are all connected with the fault detection signal input end of thedigital signal processor; the fan fault detection device adopting the structure can calculate the duty ratio of the fault detection signal inputted by the fault detection signal input end through thedigital signal processor, compares with the duty ratio with the duty ratio of the fault detection signal in normal work state of the fans, and accordingly judges if the fans are in fault state; the fan fault detection device has simple circuit structure and lower manufacturing cost.

Description

A kind of fan failure detection device

Technical field:

The utility model relates to the detection device technical field, relates in particular to a kind of fan failure detection device.

Background technique:

At present, fan has been widely used in the various electronic products such as computer, television set, power supply, with the heater element in the cool electronic product.But; because fan inside comprises devices easy to wear such as bearing; its life-span is often short than the life-span of electronic product itself; and break down easily, in case and fan breaks down, the heat that heater element produces in the electronic product just can't be discharged; thereby cause electronic product itself also to damage; so, the fault of fan in the detected electrons product how, and to do that corresponding protection handles be very important.

Whether existing fan failure detection device is mainly responded to operating state datas such as the electric current of fan or wind speed by increasing extra sensing device, break down to detect fan.As Chinese patent application number is 200810134753.6 disclosed a kind of fan failure detection device and methods, whether this fan failure detection device is that the front end at each fan is provided with the operating state data that passive inductor is obtained fan, and detect fan by the circuit units such as detection unit that are connected with passive inductor and break down.As can be seen from the above technical solutions, when needs detect a plurality of fan simultaneously, existing fan failure detection device need be installed a plurality of sensing devices, to detect the working state of each fan, like this, not only increased the manufacture cost of detection device, and the circuit structure of detection device is comparatively complicated.

The model utility content:

The purpose of this utility model is exactly the deficiency that exists at prior art and provide that a kind of circuit structure is simple, the fan failure detection device of low cost of manufacture.

To achieve these goals, the technical solution adopted in the utility model is:

It comprises DC power supplier, pull-up resistor, DSP digital signal processor, the cathode output end of DC power supplier is connected with the cathode power supply input end of a plurality of fans, the cathode output end of DC power supplier is connected with the negative power supply input end of a plurality of fans, one end of pull-up resistor is connected with the cathode power supply input end of a plurality of fans, the other end of pull-up resistor is connected with the signal output part of a plurality of fans, and the signal output part of a plurality of fans all is connected with the fault detection signal input end of DSP digital signal processor.

Described DSP digital signal processor is a single-chip microcomputer.

Described DSP digital signal processor also can be DSP (Digtal Signal Processing, Digital Signal Processing) chip.

Further comprise alarm module, the input end of alarm module is connected with the alarm signal output ends of DSP digital signal processor.

Described alarm module is LED (light emitting diode) or buzzer.

The utility model beneficial effect is:

A kind of fan failure detection device that the utility model provides comprises DC power supplier, pull-up resistor, DSP digital signal processor, the cathode output end of DC power supplier is connected with the cathode power supply input end of a plurality of fans, the cathode output end of DC power supplier is connected with the negative power supply input end of a plurality of fans, one end of pull-up resistor is connected with the cathode power supply input end of a plurality of fans, the other end of pull-up resistor is connected with the signal output part of a plurality of fans, and the signal output part of a plurality of fans all is connected with the fault detection signal input end of DSP digital signal processor; The fan failure detection device of employing said structure can calculate the dutycycle of the fault detection signal of fault detection signal input end input by DSP digital signal processor, and the dutycycle of fault detection signal compares during with the fan proper functioning, thereby judge whether fan breaks down; Compare with existing fan failure detection device, when detecting a plurality of fan at the same time, the utility model need not to install a plurality of sensing devices, and circuit structure is simple, manufacture cost is lower.

Description of drawings:

Fig. 1 is a block diagram of the present utility model;

Fig. 2 is the circuit theory diagrams of fan inside;

Fig. 3 is the circuit theory diagrams that the utility model pull-up resistor is connected with a plurality of fan internal circuits.

Embodiment:

Below in conjunction with accompanying drawing the utility model is further described, please refer to Fig. 1, the utility model comprises DC power supplier 1, pull-up resistor 2, DSP digital signal processor 3, the cathode output end of DC power supplier 1 is connected with the cathode power supply input end (VCC_Fan) of a plurality of fans, the cathode output end of DC power supplier 1 is connected with the negative power supply input end (GND_Fan) of a plurality of fans, one end of pull-up resistor 2 is connected with the cathode power supply input end of a plurality of fans, the other end of pull-up resistor 2 is connected with the signal output part of a plurality of fans (Fan_Signal), the signal output part of a plurality of fans all is connected with the fault detection signal input end of DSP digital signal processor 3, in the present embodiment, described fan is DC fan; Described DSP digital signal processor 3 is single-chip microcomputer or dsp chip.

The utility model further comprises alarm module 4, the input end of alarm module 4 is connected with the alarm signal output ends of DSP digital signal processor 3, more particularly, described alarm module 4 is LED or buzzer, when DSP digital signal processor 3 detects fan and breaks down, the alarm signal output ends of DSP digital signal processor 3 can be exported control signal, drive the alarm signal that alarm module 4 sends light or sound, remind the fan of operator's electronic product to break down, need make corresponding processing.

Please refer to Fig. 2, circuit theory diagrams for fan inside, because it is the motor that 50% pulse signal (FanDriver) goes to drive fan inside that fan inside generally can produce a dutycycle, this pulse signal is connected to the base stage of a triode Q by a resistance R x simultaneously, the grounded-emitter connection of triode Q, the collector electrode of triode Q is the signal output part of fan.

Please refer to Fig. 3, the circuit theory diagrams that are connected with a plurality of fan internal circuits for pull-up resistor 2, as can be seen from the figure, because the signal output part of all fans all links together, when the pulse signal of fan inside is high level, the triode Q conducting of fan inside, when the pulse signal of fan inside is low level, the triode Q of fan inside ends, so, when having only the pulse signal of all fans all to be low level, signal output part just is a high level, otherwise, signal output part is a low level, hence one can see that, and the utility model is that the pulse signal with all fans synthesizes a fault detection signal, therefore, calculate the dutycycle of the fault detection signal of fault detection signal input end input by DSP digital signal processor 3, and whether the dutycycle of fault detection signal compares during with all fan proper functioning, just can judge fan and break down, and has several fans to break down; Compare with existing fan failure detection device, when detecting a plurality of fan at the same time, the utility model need not to install a plurality of sensing devices, and circuit structure is simple, manufacture cost is lower; And, when needs detect the number of fans minimizing or increase,, need not to change the circuit structure of detection device as long as correspondingly revise the software of DSP digital signal processor 3, easy to use.

Certainly, the above only is preferred embodiment of the present utility model, so all equivalences of doing according to the described structure of the utility model patent claim, feature and principle change or modify, is included in the utility model patent claim.

Claims

1, a kind of fan failure detection device, it is characterized in that: it comprises DC power supplier, pull-up resistor, DSP digital signal processor, the cathode output end of DC power supplier is connected with the cathode power supply input end of a plurality of fans, the cathode output end of DC power supplier is connected with the negative power supply input end of a plurality of fans, one end of pull-up resistor is connected with the cathode power supply input end of a plurality of fans, the other end of pull-up resistor is connected with the signal output part of a plurality of fans, and the signal output part of a plurality of fans all is connected with the fault detection signal input end of DSP digital signal processor.

2, a kind of fan failure detection device according to claim 1, it is characterized in that: described DSP digital signal processor is a single-chip microcomputer.

3, a kind of fan failure detection device according to claim 1, it is characterized in that: described DSP digital signal processor is a dsp chip.

4, a kind of fan failure detection device according to claim 1 is characterized in that: further comprise alarm module, the input end of alarm module is connected with the alarm signal output ends of DSP digital signal processor.

5, a kind of fan failure detection device according to claim 4, it is characterized in that: described alarm module is LED or buzzer.