CN204214565U - Coil winding temperature rise testing circuit, electromagnet control device, isolating switch - Google Patents
Coil winding temperature rise testing circuit, electromagnet control device, isolating switch Download PDFInfo
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- CN204214565U CN204214565U CN201420711131.6U CN201420711131U CN204214565U CN 204214565 U CN204214565 U CN 204214565U CN 201420711131 U CN201420711131 U CN 201420711131U CN 204214565 U CN204214565 U CN 204214565U
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Abstract
The utility model discloses a kind of coil winding temperature rise testing circuit, belong to technical field of electrical measurement.This coil winding temperature rise testing circuit comprises: sample resistance, its connect with described coil winding and resistance much smaller than coil winding resistance; Voltage sample circuit, measures for the branch road both end voltage be connected into described sample resistance both end voltage and coil winding and sample resistance; Temperature rise processing unit, for the data measured by voltage sample circuit, calculates the hot resistance of described coil winding, and calculates the temperature rise of described coil winding according to the hot resistance of described coil winding and temperature coefficient.The invention also discloses a kind of electromagnet control device and a kind of isolating switch.The Measurement accuracy that the utility model does not need serviceability temperature sensor can realize coil winding temperature rise, and structure is simple, realizes cost low.
Description
Technical field
The utility model relates to a kind of coil winding temperature rise testing circuit, particularly relates to a kind of coil winding temperature rise testing circuit not needing temperature sensor, belongs to technical field of electrical measurement.
Background technology
Along with the fast development of Circuit breaker technology, distribution requires more and more higher, and the function of isolating switch gets more and more, and internal accessories of breaker also gets more and more, and the reliability of annex is directly connected to the reliability of isolating switch.The annexes such as the on/off switch operating mechanism in existing isolating switch use electromagnet to come drive actions topworks mostly.
Electromagnet, as the contents of isolating switch, needs consideration two aspect temperature requirement: environment temperature and electromagnet temperature rise in work.Work of electromagnet can cause temperature to raise, and the larger then temperature of power input is higher.Electromagnet at high temperature works, and the serious electromagnet that even makes damages.Therefore be necessary to monitor the temperature rise of electromagnet winding coil.The temperature measurement of existing winding coil usually adopts temperature sensor to realize or obtains according to the cold and hot state resistance of winding coil and temperature coefficient measurement thereof.But the measurement of the hot resistance of winding coil there is no good solution at present.
Utility model content
Technical problem to be solved in the utility model is to overcome prior art deficiency, provides a kind of coil winding temperature rise testing circuit, does not need temperature sensor, and has that structure is simple, measurement result advantage accurately.
The utility model is concrete by the following technical solutions:
A kind of coil winding temperature rise testing circuit, comprising:
Sample resistance, its connect with described coil winding and resistance much smaller than coil winding resistance;
Voltage sample circuit, measures for the branch road both end voltage be connected into coil winding and sample resistance;
Temperature rise processing unit, for the data measured by sample resistance both end voltage and voltage sample circuit, obtains the temperature rise of described coil winding.
Invention thinking according to the present invention can also obtain a kind of electromagnet control device and a kind of isolating switch, specific as follows:
A kind of electromagnet control device, comprises the coil winding temperature rise inspection for detecting described magnet spool winding temperature rise
Slowdown monitoring circuit, described coil winding temperature rise testing circuit is coil winding temperature rise testing circuit described in above technical scheme.
A kind of isolating switch, comprises at least one action actuating mechanism and for driving electromagnet, the electromagnet control device of this action actuating mechanism, described electromagnet control device is above-mentioned electromagnet control device.
Compared to existing technology, the utility model has following meaningful effect:
The Measurement accuracy that the utility model does not need serviceability temperature sensor can realize coil winding temperature rise, and structure is simple, realizes cost low.
Accompanying drawing explanation
Fig. 1 is the principle schematic of electromagnet control device described in embodiment;
Fig. 2 is the practical circuit diagram of electromagnet control device shown in Fig. 1.
Embodiment
Below in conjunction with accompanying drawing, the technical solution of the utility model is described in detail:
Thinking of the present utility model be arrange one to connect with coil winding to be measured and its resistance much smaller than the sample resistance of coil winding resistance, the branch road both end voltage be connected into by measuring sample resistance both end voltage and coil winding and sample resistance obtains the hot resistance of coil winding, and then realizes the detection treating test coil winding temperature rise.
Fig. 1 shows a kind of basic structure principle adopting the electromagnet control device of the utility model coil winding temperature rise testing circuit, as shown in Figure 1, this electromagnet control device comprises the power circuit be connected with external power source, voltage sample circuit, be connected with electromagnet for disconnecting and connecting the electronic switch S in magnet coil loop, the sample resistance R be connected with electronic switch S, with sample resistance R, voltage sample circuit connects the temperature rise processing unit for detecting magnet coil temperature rise, be connected with temperature rise processing unit and electronic switch S, and by the control of temperature rise processing unit thus for the control circuit disconnected with connect electronic switch S, power circuit is temperature rise processing unit, control circuit provides power supply.
After gauge tap SB1 connects, supply voltage U1 converts the working power of low voltage voltage U2 as control circuit, temperature rise processing unit to by power circuit, voltage U 1 is converted to sampling voltage U4 feeding temperature rise processing unit and carries out voltage detecting by voltage sample circuit in proportion, action control voltage sends instruction and makes electronic switch S conducting simultaneously, make electromagnet L adhesive, produce electromagnet current I, electric current I produces the voltage U that can reflect electric current I size in real time on sample resistance R
3send into temperature rise processing unit, voltage sample circuit detects magnet control voltage U in real time
1with sample resistance R both end voltage U
3by calculating, temperature rise processing unit judges whether coil temperature exceedes normal serviceability temperature; normal serviceability temperature is exceeded when detecting electromagnet; temperature rise processing unit makes control circuit control electronic switch S action; disconnect the operating circuit of magnet coil; send electromagnet overtemperature alarm signal, prompting staff maintenance, reaches the object of protection and monitoring magnet coil simultaneously.
Sample resistance R connects with magnet coil, and its resistance R is not much smaller than coil resistance (affecting electromagnetic actuation), and both resistances differ two magnitudes or more usually, and temperature rise processing unit detects sample resistance R both end voltage U
3, by calculating I=U
3/ R can obtain the electric current I in magnet coil.Temperature rise processing unit is according to magnet control voltage U
1r can be calculated with electric current I
always=U
1/ I obtains the all-in resistance R in detection line, and namely all-in resistance is R
always=U
1× R/U
3, then the hot resistance R '=U of now magnet coil
1× R/U
3-R, temperature rise processing unit is again according to formula R (t)=R (0) (1+ α t), electromagnet now temperature t=(R (t)-R (0) can be drawn)/(R (0) × α), wherein R (t) is coil resistance during t DEG C, coil resistance when R (0) is 0 DEG C, α is temperature-coefficient of electrical resistance, the hot resistance of the magnet coil that this moment temperature rise processing unit calculates is R ', then magnet coil winding now temperature t=(R '-R (0))/(R (0) × α).It is important to note that in technique scheme, the calculating of hot resistance and calculate temperature rise according to hot resistance and temperature-coefficient of electrical resistance and be existing mature technology, the not claimed technical scheme of the utility model.
Fig. 2 is a kind of specific implementation circuit of above-mentioned electromagnet control device, as shown in Figure 2, control circuit and temperature rise processing unit are realized by control chip MCU, and the E1 pin of control chip MCU is power input, and the E2 pin of control chip MCU is for detecting power input voltage U
1, the E3 pin of control chip MCU is for controlling electronic switch S, and the E4 pin of control chip MCU is for measuring sample resistance R1 both end voltage U
3, the E5 pin of control chip MCU is used for sending overtemperature fault-signal.Voltage sample circuit is made up of resistance R3, resistance R4, and power electric routing resistance R2, electric capacity C1 are formed, and electronic switch S of the present utility model is metal-oxide-semiconductor Q1, and magnet coil is L.
After gauge tap SB1 connects, supply voltage U
1low voltage voltage U is transformed into through resistance R2, electric capacity C1
2for providing control chip MCU to provide working power, and supply voltage U
1voltage U is converted to after resistance R3, resistance R4 in proportion dividing potential drop
4be supplied to and carry out magnitude of voltage detection for control chip MCU, now control chip MCU sends order and makes metal-oxide-semiconductor Q1 conducting, electromagnet L adhesive, flow through electric current I coating-forming voltage U3 on sample resistance R1 of magnet coil, voltage U 3 sends into control chip MCU through the E4 pin of control chip MCU, calculated the size of electric current I again according to the value of U3 and R1 by control chip MCU, then in conjunction with known electromagnet parameter, with formula R (t)=R (0) (1+ α t), calculate the temperature on magnet coil.
If input supply voltage U
1for AC230V, the resistance of magnet coil L 0 degree time is 2K Ω, and sample resistance R1 is 10 Ω, if in normal use procedure, temperature rise processing unit records U
1voltage is 228V, U
3voltage is 0.8V, thus to calculate actual current in coil be I=U
3/ R1=0.08A, now all-in resistance R in electromagnet circuit
always=U
1/ I=2850 Ω, then magnet coil now hot resistance be R '=R
always-R1=2840 Ω, now the temperature t=(R '-2000 of magnet coil)/(2000 × 0.0039)=108 DEG C, the utility model is 0.0039/ DEG C for the temperature-coefficient of electrical resistance of fine copper.If the coil normal working temperature upper limit that control chip MCU is arranged is 100 DEG C, and now temperature rise processing unit detects that magnet coil actual temperature t is 108 DEG C, more than 100 DEG C, make pilot lamp DS or be total to his warning device to send electromagnet overtemperature alarm so transmission instruction is disconnected electronic switch metal-oxide-semiconductor S1 and gone out alerting signal by the E5 human hair combing waste of control chip MCU by control chip MCU.Control chip MCU can adopt C51 series.
Electromagnet control device of the present utility model can be widely used in the various occasions using the action of solenoid actuated topworks, such as, the operating mechanisms such as the on/off switch of solenoid actuated are utilized in isolating switch, electromagnet control device of the present utility model can be adopted, realize the real-time monitoring of magnet coil winding temperature rise and control accordingly according to monitored results.
Claims (5)
1. a coil winding temperature rise testing circuit, is characterized in that, comprising:
Sample resistance, its connect with described coil winding and resistance much smaller than coil winding resistance;
Voltage sample circuit, measures for the branch road both end voltage be connected into coil winding and sample resistance;
Temperature rise processing unit, for the data measured by sample resistance both end voltage and voltage sample circuit, obtains the temperature rise of described coil winding.
2. coil winding temperature rise testing circuit as claimed in claim 1, it is characterized in that, described temperature rise processing unit is C51 Series MCU.
3. an electromagnet control device, comprising the coil winding temperature rise testing circuit for detecting described magnet spool winding temperature rise, it is characterized in that, described coil winding temperature rise testing circuit is coil winding temperature rise testing circuit described in claim 1 or 2.
4. an isolating switch, comprise at least one action actuating mechanism and for driving electromagnet, the electromagnet control device of this action actuating mechanism, it is characterized in that, described electromagnet control device is electromagnet control device described in claim 3.
5. isolating switch as claimed in claim 4, it is characterized in that, described action actuating mechanism is on/off switch operating mechanism.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420711131.6U CN204214565U (en) | 2014-11-24 | 2014-11-24 | Coil winding temperature rise testing circuit, electromagnet control device, isolating switch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420711131.6U CN204214565U (en) | 2014-11-24 | 2014-11-24 | Coil winding temperature rise testing circuit, electromagnet control device, isolating switch |
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| Publication Number | Publication Date |
|---|---|
| CN204214565U true CN204214565U (en) | 2015-03-18 |
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|---|---|---|---|
| CN201420711131.6U Active CN204214565U (en) | 2014-11-24 | 2014-11-24 | Coil winding temperature rise testing circuit, electromagnet control device, isolating switch |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105466604A (en) * | 2015-11-20 | 2016-04-06 | 国家电网公司 | Calculation method and apparatus for calorific value of switch electromagnet coil |
| CN107907831A (en) * | 2017-12-22 | 2018-04-13 | 深圳和而泰数据资源与云技术有限公司 | Winding temperature detection circuit, temperature measurement control system and temperature monitor |
| CN108375422A (en) * | 2018-01-29 | 2018-08-07 | 中国第汽车股份有限公司 | A kind of control method, control device and system that electromagnet temperature liter is tested automatically |
| CN111044817A (en) * | 2019-12-10 | 2020-04-21 | 格力电器（武汉）有限公司 | Temperature rise test system and test method |
| CN115014565A (en) * | 2022-06-01 | 2022-09-06 | 宁波赛福汽车制动有限公司 | Coil temperature detection circuit and detection method |
-
2014
- 2014-11-24 CN CN201420711131.6U patent/CN204214565U/en active Active
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105466604A (en) * | 2015-11-20 | 2016-04-06 | 国家电网公司 | Calculation method and apparatus for calorific value of switch electromagnet coil |
| CN107907831A (en) * | 2017-12-22 | 2018-04-13 | 深圳和而泰数据资源与云技术有限公司 | Winding temperature detection circuit, temperature measurement control system and temperature monitor |
| CN107907831B (en) * | 2017-12-22 | 2024-04-19 | 深圳和而泰智能家电控制器有限公司 | Winding temperature detection circuit, temperature detection control system and temperature detector |
| CN108375422A (en) * | 2018-01-29 | 2018-08-07 | 中国第汽车股份有限公司 | A kind of control method, control device and system that electromagnet temperature liter is tested automatically |
| CN108375422B (en) * | 2018-01-29 | 2019-10-29 | 中国第一汽车股份有限公司 | A kind of control method that electromagnet temperature rise is tested automatically, control device and system |
| CN111044817A (en) * | 2019-12-10 | 2020-04-21 | 格力电器（武汉）有限公司 | Temperature rise test system and test method |
| CN115014565A (en) * | 2022-06-01 | 2022-09-06 | 宁波赛福汽车制动有限公司 | Coil temperature detection circuit and detection method |
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