CN203012054U - Medical equipment or reagent cooling fan state detection circuit - Google Patents
Medical equipment or reagent cooling fan state detection circuit Download PDFInfo
- Publication number
- CN203012054U CN203012054U CN 201220721580 CN201220721580U CN203012054U CN 203012054 U CN203012054 U CN 203012054U CN 201220721580 CN201220721580 CN 201220721580 CN 201220721580 U CN201220721580 U CN 201220721580U CN 203012054 U CN203012054 U CN 203012054U
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- fan
- module
- detection circuit
- state detection
- switching mode
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Abstract
The utility model provides a medical equipment or reagent cooling fan state detection circuit, which comprises: a sampling module for voltage sampling of a fan output end, a switch module for breakover or turn-off according to the voltage acquired by the sampling module, a monitoring module for counting the number of breakover or turn-off of the switch module and for monitoring the fan state according to the counting result, and an alarm module for alarming during faults of the fan. The sampling module, the switch module, the monitoring module and the alarm module are electrically connected in order. The sampling module is connected between a current output end of the fan and an earth wire. By the technical scheme of the utility model, various states of the fan are detected. The fan state detection circuit provided by the utility has high reliability.
Description
Technical field
The utility model relates to the electronic monitoring field, relates in particular to a kind of Medical Devices or reagent to be carried out cooling fan state detection circuit.
Background technology
Usually, in full-automatic medical inspection apparatus field, usually need to be to the preservation of freezing of medicine equipment or reagent, due to the restriction that is subject to the space, the general semiconductor chilling plate refrigeration that adopts, also need simultaneously fan to carry out forced heat radiation to the hot junction of refrigeration system, thereby can reach better cooling effect, improve the refrigerating efficiency of cooling piece.Therefore, fan has important effect in semiconductor refrigeration system, in case fan breaks down, will cause following result: first, fan hinders when quitting work for some reason, causes the heat that the refrigeration system hot junction is gathered in time not distribute, and is easy to damage semiconductor chilling plate; The second, fan performance descends, and when namely rotating speed is slack-off, can have a strong impact on semiconductor refrigerating amount and refrigerating efficiency.
Consider cost factor, fan generally only has power lead and ground wire, and for this fan, most of circuit can only realize that measuring ability is more single to the detection of the fault that causes because of line broken circuit.
The utility model content
The utility model be intended to solve prior art to Medical Devices or reagent carry out cooling in status detection function to fan single, can only detect the technical matters of open circuit fault, a kind of fan state detection circuit that can detect the various faults state of fan is provided.
A kind of Medical Devices or reagent are carried out cooling fan state detection circuit, described fan state detection circuit comprises:
The fan output terminal is carried out the sampling module of voltage sample;
According to the voltage turn-on of sampling module collection or the switch module of shutoff;
To the conducting number of times of switch module or turn-off number of times is counted and the monitoring modular of fan-status being monitored according to count results;
The alarm module of reporting to the police when fan breaks down;
Described sampling module, switch module, monitoring modular and alarm module are electrically connected to successively;
Described sampling module is connected between the current output terminal and ground wire of described fan.
Preferably, described sampling module comprises the current output terminal that is connected to fan and the sampling resistor between ground wire.
Preferably, described switch module comprises power supply and switching mode triode, the collector of described switching mode triode is connected with described power supply and monitoring modular respectively, and the base stage of switching mode triode is connected with the current output terminal of fan, and the emitter of switching mode triode is connected with ground wire.
Preferably, described monitoring modular comprises that conducting or a turn-off number of times to switching tube counts, and the single-chip microcomputer of fan-status being monitored according to count results.
Preferably, described alarm module is audible-visual annunciator.
The above technical scheme, adopt a sampling module that the fan output terminal is sampled, and connect a switch module, utilize monitoring modular that switch module conducting or turn-off number of times are counted and monitored, can effectively judge the various running statuses of fan, comprise various malfunctions, simultaneously, control alarm module and report to the police when the fan abnormal being detected.The technical solution of the utility model has realized that the various states of fan detects and fault alarm, and reliability is high.
Description of drawings
Fig. 1 is the structured flowchart of a kind of embodiment of the utility model;
Fig. 2 is the electrical block diagram of a kind of embodiment of the utility model.
Embodiment
Clearer for technical matters, technical scheme and beneficial effect that the utility model is solved, below in conjunction with drawings and Examples, the utility model is further elaborated.Should be appreciated that specific embodiment described herein only in order to explaining the utility model, and be not used in restriction the utility model.
As shown in Figure 1, a kind of fan state detection circuit of the present utility model, comprise for fan 10 output terminals being carried out the sampling module 20 of voltage sample, be used for according to the voltage turn-on of sampling module 20 collections or the switch module 30 of shutoff, be used for the conducting number of times of switch module 30 or turn-off number of times is counted and the monitoring modular 40 of fan-status being monitored according to count results, and be used for the alarm module 50 of reporting to the police when fan breaks down.
Described sampling module 20, switch module 30, monitoring modular 40 and alarm module 50 are electrically connected to successively;
Described sampling module 20 is connected between the current output terminal and ground wire of described fan 10.
In conjunction with shown in Figure 2, in concrete the application, described fan 10 has one and is the power supply VCC1 of its power supply, and power supply VCC1 provides normal operating voltage for fan 10.
According to the operating characteristic of fan 10 internal drive motor as can be known, fan 10 is in normal range of operation, the voltage at sampling resistor R1 two ends is periodically variable, and voltage VR1 also just follows the variation of electric current to fluctuate in a higher limit and a lower limit scope.Choosing of sampling resistor R1 resistance is relevant with the working current of fan, and electric current is larger, and the resistance of sampling resistor R1 should be less, otherwise the overtension at sampling resistor R1 two ends, can cause the voltage drop at fan two ends and make rotation speed of the fan slack-off; Electric current is less, and the resistance of sampling resistor R1 should be larger, otherwise brownout, does not reach switching device turn-on condition in described switch module and affects the state-detection of fan.
Preferably, switch module 30 in the present embodiment comprises power supply VCC2 and switching mode triode Q1, the collector of described switching mode triode Q1 is connected with described power supply VCC2 and monitoring modular 40 respectively, the base stage of switching mode triode Q1 is connected with the current output terminal of fan 10, and the emitter of switching mode triode Q1 is connected with the ground wire of fan 10.
as shown from the above technical solution, the voltage of described sampling resistor R1 can be loaded on the base stage of described switching mode triode Q1, because the magnitude of voltage VR1 at sampling resistor R1 two ends is undulating quantitys, by the principle of work of switching mode triode Q1 as can be known, when the value of voltage VR1 during more than or equal to the base-on voltage of switching mode triode Q1, described switching mode triode Q1 conducting, power supply VCC2 is through collector and emitter and the ground conducting of switching mode triode Q1, the voltage U 1 of described collector is 0, this voltage is the voltage that is transported in monitoring modular 40, monitoring modular 40 detects a low level signal at this moment, opposite, during less than the base-on voltage of switching mode triode Q1, described switching mode triode Q1 turn-offs when the value of voltage VR1, because switching mode triode Q1 turn-offs, the voltage U 1 of collector is the voltage of power supply VCC2, and at this moment, monitoring modular 40 detects a high level signal.
The voltage at sampling resistor R1 two ends is periodically variable, voltage VR1 also just follows the variation of electric current to fluctuate in a higher limit and a lower limit scope, in above-described embodiment, the base-on voltage of described switching mode triode Q1 should greater than the minimum value of VR1, be less than or equal to the maximal value of described VR1.
Described monitoring modular 40 comprises a single-chip microcomputer 41, and described single-chip microcomputer 41 is used for conducting or the turn-off number of times of switching tube 31 are counted, and according to count results, fan-status is monitored.
The principle of work of the above fan state detection circuit is as follows: at first with monitoring modular 40 power-up initializings, and the described counting zero clearing of internal system.when fan 10 is switched on and is worked, electric current flows to ground through sampling resistor R1, through the current cycle variation on sampling resistor R1, therefore the also cyclical variation of voltage VR1 at sampling resistor R1 two ends, this voltage VR1 is the voltage on final switching mode triode Q1 base stage, because of the base-on voltage of the switching mode triode Q1 minimum value greater than VR1, the maximal value that is less than or equal to VR1, when the value of VR1 during more than or equal to the base-on voltage of switching mode triode Q1, switching mode triode Q1 conducting, the collector output low level (U1=0) of switching mode triode Q1, during less than the base-on voltage of switching mode triode Q1, switching mode triode Q1 turn-offs cut-off, the collector output high level (U1=VCC2) of switching mode triode Q1 when the value of VR1.
After single-chip microcomputer 41 receives the high and low level of described switching mode triode Q1, described high level or low level are counted, according to the periodicity of the working current of fan 10 as can be known, in a current cycle of fan 10, the number of times of described switching mode triode Q1 turn-on and turn-off equates, therefore, in practical application, 41 pairs of high level countings of described single-chip microcomputer can be set or low level is counted, no matter count to high level or to low level, can not produce any impact to final fan-status monitoring.Here suppose that the count value of single-chip microcomputer 41 in setting-up time t is N, the rotating speed of fan 10 is faster, and the curent change at its two ends is faster, and the count value N in setting-up time t is also just larger.
when fan 10 does not connect or fan 10 internal damage cause when opening circuit, the current output terminal no current output of fan 10, therefore the voltage of the collector of switching mode triode Q1 is 0V, this moment, switching mode triode Q1 was in the shutoff cut-off state, therefore the voltage of the collector of switching mode triode Q1 equals the voltage of power supply VCC2, the collector of switching mode triode Q1 is only exported high level signal, because there is no height, the conversion of low level signal, the count value N=0 of single-chip microcomputer 41, when the signal that namely monitors when single-chip microcomputer 41 is high level signal and count value N=0, show that described fan 10 does not connect or cause open circuit fault because of internal damage, single-chip microcomputer 41 sends alerting signal to alarm module 50, alarm module 50 is reported to the police.
When fan 10 causes short circuit because of internal damage, switching mode triode Q1 control end voltage is greater than its forward voltage, switching mode triode Q1 conducting, at this moment, the voltage of switching mode triode Q1 hot end equals 0, the hot end output low level of switching mode triode Q1, the count value N=0 of single-chip microcomputer 41, show the described fan 10 inside fault that is short-circuited this moment, this moment, single-chip microcomputer 41 sent alerting signal to alarm module 50, and alarm module 50 is reported to the police.
When fan 10 stalls or hydraulic performance decline cause rotating speed slack-off, the output current cycle of fan 10 current output terminals is elongated, therefore the recurrence interval of the collector of switching mode triode Q1 output is elongated, in setting-up time t, the count value N of single-chip microcomputer diminishes, when less than its inner setting value M, can judge that the fault of stall or hydraulic performance decline has appearred in fan.This moment, single-chip microcomputer 41 sent alerting signal to alarm module 50, and alarm module 50 is reported to the police.
Open circuit fault in order to distinguish, short trouble or stall fault, preferably, described alarm module 50 is audible-visual annunciator, when the signal that monitors when monitoring modular 40 is high level signal and count value N=0, send alerting signal and control alarm module and carry out audible alarm, show that described fan 10 does not connect or cause open circuit fault because of internal damage; When the signal that monitors when monitoring modular 40 is low level signal and count value N=0, sends alerting signal and control alarm module and carry out light and report to the police, show the described fan 10 inside fault that is short-circuited; When the count value N of single-chip microcomputer is less than its inner setting value M in monitoring modular 40 monitors setting-up time t, sends alerting signal control alarm module 50 and carry out sound and light alarm, show that the fault of stall or hydraulic performance decline has appearred in fan.
By the warning of alarm module 50, the related personnel can in time obtain the running status of fan, can in time find fault and it is keeped in repair when fan breaks down, and guarantees work efficiency and the cooling effect of whole cooling system.
The above is only preferred embodiment of the present utility model; not in order to limit the utility model; all any modifications of doing within spirit of the present utility model and principle, be equal to and replace and improvement etc., within all should being included in protection domain of the present utility model.
Claims (5)
1. one kind is carried out cooling fan state detection circuit to Medical Devices or reagent, and it is characterized in that: described fan state detection circuit comprises:
The fan output terminal is carried out the sampling module of voltage sample;
According to the voltage turn-on of sampling module collection or the switch module of shutoff;
To the conducting number of times of switch module or turn-off number of times is counted and the monitoring modular of fan-status being monitored according to count results;
The alarm module of reporting to the police when fan breaks down;
Described sampling module, switch module, monitoring modular and alarm module are electrically connected to successively;
Described sampling module is connected between the current output terminal and ground wire of described fan.
2. fan state detection circuit according to claim 1 is characterized in that: described sampling module comprises the current output terminal that is connected to fan and the sampling resistor between ground wire.
3. fan state detection circuit according to claim 2, it is characterized in that: described switch module comprises power supply and switching mode triode, the collector of described switching mode triode is connected with described power supply and monitoring modular respectively, the base stage of switching mode triode is connected with the current output terminal of fan, and the emitter of switching mode triode is connected with ground wire.
4. fan state detection circuit according to claim 3 is characterized in that: described monitoring modular comprises that conducting or a turn-off number of times to switching tube counts, and the single-chip microcomputer of fan-status being monitored according to count results.
5. fan state detection circuit according to claim 4, it is characterized in that: described alarm module is audible-visual annunciator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220721580 CN203012054U (en) | 2012-12-25 | 2012-12-25 | Medical equipment or reagent cooling fan state detection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220721580 CN203012054U (en) | 2012-12-25 | 2012-12-25 | Medical equipment or reagent cooling fan state detection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203012054U true CN203012054U (en) | 2013-06-19 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220721580 Expired - Fee Related CN203012054U (en) | 2012-12-25 | 2012-12-25 | Medical equipment or reagent cooling fan state detection circuit |
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| Country | Link |
|---|---|
| CN (1) | CN203012054U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108601944A (en) * | 2016-01-07 | 2018-09-28 | Hcp保健亚洲公司 | Has the treating skin disease device of the component for monitoring fan |
-
2012
- 2012-12-25 CN CN 201220721580 patent/CN203012054U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108601944A (en) * | 2016-01-07 | 2018-09-28 | Hcp保健亚洲公司 | Has the treating skin disease device of the component for monitoring fan |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| DD01 | Delivery of document by public notice |
Addressee: Shen Zhenwei Document name: Notification of Termination of Patent Right |
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| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130619 Termination date: 20131225 |