CN204439817U - A kind of numerical control resistance box - Google Patents
A kind of numerical control resistance box Download PDFInfo
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- CN204439817U CN204439817U CN201520125129.5U CN201520125129U CN204439817U CN 204439817 U CN204439817 U CN 204439817U CN 201520125129 U CN201520125129 U CN 201520125129U CN 204439817 U CN204439817 U CN 204439817U
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Abstract
The utility model discloses a kind of numerical control resistance box, comprise at least one automatic temperature control circuit, automatic temperature control circuit comprises temperature sensing circuit, electronic switch, fan and direct supply, electronic switch and fan electromotor are serially connected between the both positive and negative polarity of direct supply, the control end of the output termination electronic switch of temperature sensing circuit.The utility model is dispelled the heat by automatic temperature control circuit drive fan, works under making numerical control resistance box remain at suitable temperature, and the resistance of resistance is accurately stable, and the precision of detection is high, resistance box components and parts can not damage because of overheated, long service life.
Description
[technical field]
The utility model relates to resistance calibrating, particularly relates to a kind of numerical control resistance box.
[background technology]
The application of resistance box is generally used for the fields such as impedance switching, ohmic load.And impedance switches the combined switch resistance box that common are teaching, complete resistance by multiple switching over and arrange.There is switching complexity in the resistance box of Multi-band switch combination, reading difficulty, the problems such as resistor power is little.And electronic load requires higher at environment such as use voltage, power etc. etc., and be not suitable for exchange current.The switching that calibrating resistance box generally manually regulates rotary switch to realize between different resistance, read resistance value according to rotary switch instruction, calibrating can be caused like this to operate and comparatively bother, reading also easily causes error, and work efficiency is lower simultaneously.Simultaneously due to resistance switches will by manually having come, and it is longer manually to complete required time, can not measure by the response time of test examination instrument.
Application number is that the patent application of CN201310497771.1 discloses a kind of calibrating digital resistance case, the resistance value that this kind of calibrating needs by keyboard [3] input with digital resistance case, complete post-processing unit [2] controlling resistance in input and select [1] circuit self adjusting resistance value, and resistance value is shown to liquid crystal display [4].Wherein in the selection of resistance, control different relays by processing unit [2] and cut-off and realize.This kind of calibrating digital resistance case can resistance value in the output certain limit of increasing or decreasing within a certain period of time simultaneously, and the switching time of different resistance also can regulate, the automatic operation in examining and determine can be realized, also can be used for measuring by the sampling time of test examination instrument simultaneously.The present invention can facilitate staff regulate and read resistance value, avoids and uses rotary switch regulating resistance trouble and the troublesome shortcoming of reading resistance value, improve the work efficiency of testing person.
Digital resistance case can generate heat in the course of the work, and for high-precision digital resistance case, high temperature can affect the change in resistance of resistance, thus the precision that impact detects; Too high temperature also can damage the electric components of resistance box.
[summary of the invention]
The technical problems to be solved in the utility model is to provide the numerical control resistance box that a kind of accuracy of detection is high, be not easy because of high temperature failure.
In order to solve the problems of the technologies described above, the technical solution adopted in the utility model is, a kind of numerical control resistance box, comprise at least one automatic temperature control circuit, automatic temperature control circuit comprises temperature sensing circuit, electronic switch, fan and direct supply, electronic switch and fan electromotor are serially connected between the both positive and negative polarity of direct supply, the control end of the output termination electronic switch of temperature sensing circuit.
Above-described numerical control resistance box, temperature sensing circuit comprises the first bleeder circuit, the second bleeder circuit, the first comparer, the second comparer; First bleeder circuit comprises the first resistance and thermistor, the positive pole of the first termination direct supply of the first resistance, the first end of the second termination thermistor, the negative pole of the second termination direct supply of thermistor; Second bleeder circuit comprises the second resistance and the 3rd resistance; The positive pole of the first termination direct supply of the second resistance, the first end of the second termination the 3rd resistance, the negative pole of the second termination direct supply of the 3rd resistance; The in-phase input end of the first comparer connects the first end of thermistor, the first end of anti-phase input termination the 3rd resistance; The in-phase input end of the second comparer connects the inverting input of the first comparer, the output terminal of anti-phase input termination first comparer, and the output terminal of the second comparer is as the control end of the output termination electronic switch of temperature sensing circuit.
Above-described numerical control resistance box, thermistor is negative tempperature coefficient thermistor.
Above-described numerical control resistance box, temperature sensing circuit comprises the 6th resistance, the first end of a termination the 3rd resistance of the 6th resistance, the output terminal of another termination second comparer.
Above-described numerical control resistance box, temperature sensing circuit comprises the 4th resistance and the second electric capacity, the positive pole of a termination direct supply of the 4th resistance, the output terminal of another termination first comparer; The in-phase input end of one termination first comparer of the second electric capacity, the negative pole of another termination direct supply.
Above-described numerical control resistance box, comprises the 5th resistance and the 7th resistance, between the output terminal that the 5th resistance is connected on the second comparer and the positive pole of direct supply, between the output terminal that the 7th resistance is connected on the second comparer and the negative pole of direct supply.
Above-described numerical control resistance box, described electronic switch is metal-oxide-semiconductor, the output terminal of the grid jointing temp testing circuit of metal-oxide-semiconductor, and source electrode connects the negative pole of direct supply, the first end of drain electrode wind-receiving fan motor, the positive pole of the second termination direct supply of fan electromotor.
Above-described numerical control resistance box, comprises pilot lamp, and pilot lamp and fan electromotor also connect.
Above-described numerical control resistance box, direct supply comprises direct current 24V power supply, diode, the first electric capacity and the 3rd electric capacity, the anode of diode connects the positive pole of direct current 24V power supply, and the negative electrode of diode is the positive pole of direct supply, and the negative pole of direct current 24V power supply is the negative pole of direct supply; First electric capacity and the 3rd electric capacity are connected between the both positive and negative polarity of direct supply respectively, and the 3rd electric capacity is electrochemical capacitor.
Above-described numerical control resistance box, the resistance of numerical control resistance box is arranged on plurality of regions respectively by resistance, and each region comprises an automatic temperature control circuit.
Numerical control resistance box of the present utility model is dispelled the heat by automatic temperature control circuit drive fan, work under making numerical control resistance box remain at suitable temperature, the resistance of resistance is accurately stable, and the precision of detection is high, resistance box components and parts can not damage because of overheated, long service life.
[accompanying drawing explanation]
Below in conjunction with the drawings and specific embodiments, the utility model is described in further detail.
Fig. 1 is the structural drawing of the utility model embodiment numerical control resistance box.
Fig. 2 is the schematic diagram of the utility model embodiment numerical control resistance box automatic temperature control circuit.
[embodiment]
As shown in Figure 1, the resistance of 6 group of 10 system number is arranged on 6 regions by resistance to the structure of the numerical control resistance box of the utility model embodiment respectively, and each district comprises an automatic temperature control circuit.
Automatic temperature control circuit as shown in Figure 2, comprises temperature sensing circuit, electronic switch Q1, direct supply, input adapter CN1 and out splice going splice CN3, input adapter CN1 external direct current 24V power supply, two pin external fan motors of out splice going splice CN3.
The anode of diode D1 passes through the positive pole of the pin 1 external direct current 24V power supply of input adapter CN1, the negative electrode of diode D1 is as the positive pole of direct supply, the pin 1 of input adapter CN1 is as the negative pole of the negative pole external direct current 24V power supply of direct supply, electric capacity C1 and electric capacity C2 is connected between the both positive and negative polarity of direct supply respectively, wherein, electric capacity C3 is electrochemical capacitor.
In the present embodiment, electronic switch Q1 is power MOS pipe SSG4402N.
Temperature sensing circuit comprises the first bleeder circuit, the second bleeder circuit and LM393.LM393 is twin voltage comparer, comprises comparer U1A, comparer U1B.When positive input terminal voltage exports high level higher than during anti-phase input terminal voltage, when positive input terminal voltage is lower than output low level during anti-phase input terminal voltage.
First bleeder circuit comprises resistance R1 and negative tempperature coefficient thermistor NTC R1, the positive pole of the first termination direct supply of resistance R1, the first end of the second termination negative tempperature coefficient thermistor NTC R1, the negative pole of the second termination direct supply of negative tempperature coefficient thermistor NTC R1.Second bleeder circuit comprises resistance R2 and resistance R3.The positive pole of the first termination direct supply of resistance R2, the first end of the second terminating resistor R3, the negative pole of the second termination direct supply of resistance R3.The in-phase input end of comparer U1B connects the first end of negative tempperature coefficient thermistor NTC R1, the first end of anti-phase input terminating resistor R3.The in-phase input end of comparer U1A connects the inverting input of comparer U1B, the output terminal of anti-phase input termination comparer U1B, and the output terminal of comparer U1A is as the grid of the output termination power MOS pipe SSG4402N of temperature sensing circuit.
The first end of the one terminating resistor R3 of resistance R6, the output terminal of another termination comparer U1A.The positive pole of the one termination direct supply of resistance R4, the output terminal of another termination comparer U1B.The in-phase input end of the one termination comparer U1B of electric capacity C2, the negative pole of another termination direct supply.Between the output terminal that resistance R5 is connected on comparer U1A and the positive pole of direct supply, between the output terminal that resistance R7 is connected on comparer U1A and the negative pole of direct supply.
The source electrode of metal-oxide-semiconductor SSG4402N connects the negative pole of direct supply, and drain electrode connects the pin 2 of out splice going splice CN3, and the pin 1 of out splice going splice CN3 connects the positive pole of direct supply.
The two ends of LED light D2 connect pin 1 and the pin 2 of out splice going splice CN3 respectively.
When the automatic temperature control circuit in arbitrary region detects that temperature reaches more than 50 DEG C, negative tempperature coefficient thermistor NTCR1 is reduced to 22K from 100K resistance, now the voltage of the U1B in-phase input end of comparer LM393 will be less than the voltage (reference voltage) of inverting input, comparer U1B exports as low level, U1A in-phase input end voltage equals U1B anti-phase input terminal voltage, then U1A in-phase input end voltage is greater than anti-phase input terminal voltage, U1A exports as high level, power MOS pipe SSG4402N is by conducting, make LED signal lamp luminescence and fan turns, increase convection current, reduce the temperature of numerical control resistance box.The high level that now U1A exports feeds back to U1B inverting input by resistance R6, the reference potential of U1B inverting input will be raised further, U1B exports and remains as low level, thus makes U1A output be continuously high level, ensures the continuous firing of fan and LED signal lamp.
Claims (10)
1. a numerical control resistance box, it is characterized in that, comprise at least one automatic temperature control circuit, automatic temperature control circuit comprises temperature sensing circuit, electronic switch, fan and direct supply, electronic switch and fan electromotor are serially connected between the both positive and negative polarity of direct supply, the control end of the output termination electronic switch of temperature sensing circuit.
2. numerical control resistance box according to claim 1, is characterized in that, temperature sensing circuit comprises the first bleeder circuit, the second bleeder circuit, the first comparer, the second comparer; First bleeder circuit comprises the first resistance and thermistor, the positive pole of the first termination direct supply of the first resistance, the first end of the second termination thermistor, the negative pole of the second termination direct supply of thermistor; Second bleeder circuit comprises the second resistance and the 3rd resistance; The positive pole of the first termination direct supply of the second resistance, the first end of the second termination the 3rd resistance, the negative pole of the second termination direct supply of the 3rd resistance; The in-phase input end of the first comparer connects the first end of thermistor, the first end of anti-phase input termination the 3rd resistance; The in-phase input end of the second comparer connects the inverting input of the first comparer, the output terminal of anti-phase input termination first comparer, and the output terminal of the second comparer is as the control end of the output termination electronic switch of temperature sensing circuit.
3. numerical control resistance box according to claim 2, is characterized in that, thermistor is negative tempperature coefficient thermistor.
4. numerical control resistance box according to claim 2, is characterized in that, temperature sensing circuit comprises the 6th resistance, the first end of a termination the 3rd resistance of the 6th resistance, the output terminal of another termination second comparer.
5. numerical control resistance box according to claim 2, is characterized in that, temperature sensing circuit comprises the 4th resistance and the second electric capacity, the positive pole of a termination direct supply of the 4th resistance, the output terminal of another termination first comparer; The in-phase input end of one termination first comparer of the second electric capacity, the negative pole of another termination direct supply.
6. numerical control resistance box according to claim 2, it is characterized in that, comprise the 5th resistance and the 7th resistance, between the output terminal that the 5th resistance is connected on the second comparer and the positive pole of direct supply, between the output terminal that the 7th resistance is connected on the second comparer and the negative pole of direct supply.
7. numerical control resistance box according to claim 1, is characterized in that, described electronic switch is metal-oxide-semiconductor, the output terminal of the grid jointing temp testing circuit of metal-oxide-semiconductor, source electrode connects the negative pole of direct supply, the first end of drain electrode wind-receiving fan motor, the positive pole of the second termination direct supply of fan electromotor.
8. numerical control resistance box according to claim 1, is characterized in that, comprises pilot lamp, and pilot lamp and fan electromotor also connect.
9. numerical control resistance box according to claim 1, it is characterized in that, direct supply comprises direct current 24V power supply, diode, the first electric capacity and the 3rd electric capacity, the anode of diode connects the positive pole of direct current 24V power supply, the negative electrode of diode is the positive pole of direct supply, and the negative pole of direct current 24V power supply is the negative pole of direct supply; First electric capacity and the 3rd electric capacity are connected between the both positive and negative polarity of direct supply respectively, and the 3rd electric capacity is electrochemical capacitor.
10. numerical control resistance box according to claim 1, is characterized in that, the resistance of numerical control resistance box is arranged on plurality of regions respectively by resistance, and each region comprises an automatic temperature control circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520125129.5U CN204439817U (en) | 2015-03-04 | 2015-03-04 | A kind of numerical control resistance box |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520125129.5U CN204439817U (en) | 2015-03-04 | 2015-03-04 | A kind of numerical control resistance box |
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| CN204439817U true CN204439817U (en) | 2015-07-01 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106646249A (en) * | 2016-11-23 | 2017-05-10 | 国网江苏省电力公司苏州供电公司 | Intelligent resistance box for capacity verification of transformer station storage battery pack and capacity verification thereof |
-
2015
- 2015-03-04 CN CN201520125129.5U patent/CN204439817U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106646249A (en) * | 2016-11-23 | 2017-05-10 | 国网江苏省电力公司苏州供电公司 | Intelligent resistance box for capacity verification of transformer station storage battery pack and capacity verification thereof |
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Effective date of registration: 20160809 Address after: 3, building 2, building 2, 523000 Industrial Zone, Daling mountain town, Dongguan, Guangdong Patentee after: Guangdong core electroacoustic technology Co., Ltd. Address before: 518000 Guangdong city of Shenzhen province Baoan District City Avenue Xixiang Airlines turn Gushu Industrial Park building A.B building A floor four floor of the South South A. A Patentee before: Xin electricity Wei Science and Technology Ltd. of Shenzhen |