CN204439242U - A kind of temperature detection and overheating protection circuit - Google Patents
A kind of temperature detection and overheating protection circuit Download PDFInfo
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- CN204439242U CN204439242U CN201520028238.5U CN201520028238U CN204439242U CN 204439242 U CN204439242 U CN 204439242U CN 201520028238 U CN201520028238 U CN 201520028238U CN 204439242 U CN204439242 U CN 204439242U
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Abstract
The utility model relates to subway train technical field of electric equipment, especially a kind of temperature detection and overheating protection circuit.It comprises microcontroller, the first amplifier, the second amplifier, amplifier circuit unit and platinum resistance, first wire of platinum resistance is connected with 12V power end, second wire of platinum resistance is respectively by the first resistance eutral grounding, the in-phase end being connected the first amplifier by the 5th resistance, 3rd wire of platinum resistance is connected the end of oppisite phase of the first amplifier with the 4th resistance by the 3rd resistance of connecting successively, 3rd resistance is also by the second resistance eutral grounding, and the in-phase end of the first amplifier is also by the 6th resistance eutral grounding; The in-phase end of the second amplifier by the tenth resistance eutral grounding, be connected with the 8th resistance between end of oppisite phase and output terminal, the output terminal of the second amplifier is divided into two-way: a road connect microcontroller AD acquisition channel, separately leading up to amplifier circuit unit connects the signal feedback passage of microcontroller.The utility model can realize accurate temperature detection and protection, is conducive to the security of guarantee equipment.
Description
Technical field
The utility model relates to subway train technical field of electric equipment, especially a kind of temperature detection and overheating protection circuit.
Background technology
In recent years, along with developing rapidly of economy, China's urban modernization track traffic enters a high-speed developing period, and Feasibility of developing track transportation is fallen over each other to alleviate day by day serious traffic jam issue in national many big and medium-sized cities.In urban rail transit vehicles traction generator, AC Drive Technology application is more and more extensive, and replacing traditional DC Transmission technology already becomes current development trend.
Detection and protection circuit are the important component parts in A/C transmission control system, and in order to meet the needs of control procedure and ensure the safe and reliable of system, the design of detection and protection circuit seems particularly important.Therefore, for avoid the element in system and equipment Yin Wendu too high and the fault such as operation irregularity or damage occurs, be necessary to propose a kind of overheating detection and protection circuit for electric tractor or A/C transmission control system.
Utility model content
For the deficiencies in the prior art, the purpose of this utility model is to provide the temperature detection and overheating protection circuit that a kind of circuit structure is simple, accuracy is high, safe and reliable.
To achieve these goals, the utility model adopts following technical scheme:
A kind of temperature detection and overheating protection circuit, it comprises microcontroller, first amplifier, second amplifier, the platinum resistance of amplifier circuit unit and three-wire system, first wire of described platinum resistance is connected with 12V power end, second wire of described platinum resistance is respectively by the first resistance eutral grounding, the in-phase end of the first amplifier is connected by the 5th resistance, 3rd wire of described platinum resistance is connected the end of oppisite phase of the first amplifier with the 4th resistance by the 3rd resistance of connecting successively, described 3rd resistance is also by the second resistance eutral grounding, the in-phase end of described first amplifier is also by the 6th resistance eutral grounding,
Be connected with the 7th resistance between the in-phase end of described first amplifier and output terminal, the output terminal of described first amplifier connects the end of oppisite phase of the second amplifier by the 9th resistance;
The in-phase end of described second amplifier by the tenth resistance eutral grounding, be connected with the 8th resistance between end of oppisite phase and output terminal, the output terminal of described second amplifier is divided into two-way: a road connect microcontroller AD acquisition channel, separately leading up to amplifier circuit unit connects the signal feedback passage of microcontroller.
Preferably, it also comprises 5V power end, described amplifier circuit unit comprises the 3rd amplifier, adjustable resistor and the 11 resistance, the adjustable side that the in-phase end of described 3rd amplifier connects the output terminal of the second amplifier, end of oppisite phase connects adjustable resistor, output terminal connect the signal feedback passage of microcontroller, between the output terminal that described 11 resistance is connected to the 3rd amplifier and 5V power end.
Preferably, the output terminal of described second amplifier is also connected with 5V power end respectively by the first diode, by the second diode ground connection.
Preferably, described platinum resistance is PT100 type, and described first amplifier, the second amplifier and the 3rd amplifier are LF353 type operational amplifier.
Owing to have employed such scheme, the utility model utilizes the characteristic of platinum resistance, structure optimization has been carried out to whole circuit, make it on the basis can eliminating the measuring error that wire line resistance brings, effectively raise the accuracy of measurement, ensure that circuit is when applying, the safety of relevant device; Its structure is simple, has very strong practicality.
Accompanying drawing explanation
Fig. 1 is the circuit structure diagram of the utility model embodiment.
Embodiment
Below in conjunction with accompanying drawing, embodiment of the present utility model is described in detail, but the multitude of different ways that the utility model can be defined by the claims and cover is implemented.
As shown in Figure 1, the temperature detection of the present embodiment and overheating protection circuit, it comprises the platinum resistance R of microcontroller a, the first amplifier U1, the second amplifier U2, amplifier circuit unit b and three-wire system; Wherein, first wire of platinum resistance R is connected with 12V power end, second wire of platinum resistance R is respectively by the first resistance R1 ground connection, the in-phase end being connected the first amplifier U1 by the 5th resistance R5,3rd wire of platinum resistance R is connected the end of oppisite phase of the first amplifier U1 with the 4th resistance R4 by the 3rd resistance R3 connected successively, 3rd resistance R3 is also by the second resistance R2 ground connection, and the in-phase end of the first amplifier U1 is also by the 6th resistance R6 ground connection; Meanwhile, be connected with the 7th resistance R7 between the in-phase end of the first amplifier U1 and output terminal, the output terminal of the first amplifier U1 connects the end of oppisite phase of the second amplifier U2 by the 9th resistance R9; The in-phase end of the second amplifier U2 by the tenth resistance R10 ground connection, be connected with the 8th resistance R8 between end of oppisite phase and output terminal, the output terminal of the second amplifier U2 is divided into two-way: a road connect microcontroller a AD acquisition channel, separately leading up to amplifier circuit unit b connects the signal feedback passage of microcontroller a.
So, platinum resistance R can form vertical electric bridge circuit with the first resistance R1, the second resistance R2 and the 3rd resistance R3, when bridge balancing, the change of the conductor resistance of platinum resistance R on measurement result without any impact, thus eliminate the measuring error that wire line resistance brings, ensure that the accuracy of measurement.When dut temperature changes, the resistance of platinum resistance R changes, the current potential of the intermediate point generation of two brachium pontis on bridge road is after the anti-phase amplification of the first amplifier U1 and the second amplifier U2, be divided into two-way: wherein a road is for being input to the AD acquisition channel of microcontroller a, can obtain tested temperature by the linear relationship between input voltage and the temperature-resistance of platinum resistance R; The protection reference value that another Lu Zeyu sets compares; by amplifier circuit unit b to microcontroller a feedback protection signal; when the magnitude of voltage of temperature of reaction signal exceedes the protection reference value of setting; amplifier circuit unit b exports high level; triggered interrupts; thus when circuit application, ensure the safety of equipment.
For ensureing the working effect of amplifier circuit unit b, the circuit of the present embodiment also comprises 5V power end, amplifier circuit unit b then comprises the 3rd amplifier U3, adjustable resistor Rp and the 11 resistance R11, the adjustable side that the in-phase end of the 3rd amplifier U3 connects the output terminal of the second amplifier U2, end of oppisite phase connects adjustable resistor Rp, output terminal connect the signal feedback passage of microcontroller a, between the output terminal that 11 resistance R11 is connected to the 3rd amplifier U3 and 5V power end, with this, realize adjustment and the setting of magnification ratio by adjustable resistor Rp.
Further, the output terminal of the second amplifier U2 is also connected with 5V power end respectively by the first diode D1, by the second diode D2 ground connection.In addition, for optimizing the performance of whole circuit, the platinum resistance R of the present embodiment is PT100 type, and the first amplifier U1, the second amplifier U2 and the 3rd amplifier U3 all adopt LF353 type operational amplifier.
The foregoing is only preferred embodiment of the present utility model; not thereby the scope of the claims of the present utility model is limited; every utilize the utility model instructions and accompanying drawing content to do equivalent structure or equivalent flow process conversion; or be directly or indirectly used in other relevant technical fields, be all in like manner included in scope of patent protection of the present utility model.
Claims (4)
1. a temperature detection and overheating protection circuit, it is characterized in that: it comprises microcontroller, first amplifier, second amplifier, the platinum resistance of amplifier circuit unit and three-wire system, first wire of described platinum resistance is connected with 12V power end, second wire of described platinum resistance is respectively by the first resistance eutral grounding, the in-phase end of the first amplifier is connected by the 5th resistance, 3rd wire of described platinum resistance is connected the end of oppisite phase of the first amplifier with the 4th resistance by the 3rd resistance of connecting successively, described 3rd resistance is also by the second resistance eutral grounding, the in-phase end of described first amplifier is also by the 6th resistance eutral grounding,
Be connected with the 7th resistance between the in-phase end of described first amplifier and output terminal, the output terminal of described first amplifier connects the end of oppisite phase of the second amplifier by the 9th resistance;
The in-phase end of described second amplifier by the tenth resistance eutral grounding, be connected with the 8th resistance between end of oppisite phase and output terminal, the output terminal of described second amplifier is divided into two-way: a road connect microcontroller AD acquisition channel, separately leading up to amplifier circuit unit connects the signal feedback passage of microcontroller.
2. a kind of temperature detection as claimed in claim 1 and overheating protection circuit; it is characterized in that: it also comprises 5V power end; described amplifier circuit unit comprises the 3rd amplifier, adjustable resistor and the 11 resistance; the adjustable side that the in-phase end of described 3rd amplifier connects the output terminal of the second amplifier, end of oppisite phase connects adjustable resistor, output terminal connect the signal feedback passage of microcontroller, between the output terminal that described 11 resistance is connected to the 3rd amplifier and 5V power end.
3. a kind of temperature detection as claimed in claim 2 and overheating protection circuit, is characterized in that: the output terminal of described second amplifier is also connected with 5V power end respectively by the first diode, by the second diode ground connection.
4. a kind of temperature detection as claimed in claim 3 and overheating protection circuit, is characterized in that: described platinum resistance is PT100 type, and described first amplifier, the second amplifier and the 3rd amplifier are LF353 type operational amplifier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520028238.5U CN204439242U (en) | 2015-01-15 | 2015-01-15 | A kind of temperature detection and overheating protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520028238.5U CN204439242U (en) | 2015-01-15 | 2015-01-15 | A kind of temperature detection and overheating protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204439242U true CN204439242U (en) | 2015-07-01 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520028238.5U Expired - Fee Related CN204439242U (en) | 2015-01-15 | 2015-01-15 | A kind of temperature detection and overheating protection circuit |
Country Status (1)
| Country | Link |
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| CN (1) | CN204439242U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107167261A (en) * | 2017-06-14 | 2017-09-15 | 成都雅骏新能源汽车科技股份有限公司 | A kind of temperature checking method and circuit based on thermistor |
-
2015
- 2015-01-15 CN CN201520028238.5U patent/CN204439242U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107167261A (en) * | 2017-06-14 | 2017-09-15 | 成都雅骏新能源汽车科技股份有限公司 | A kind of temperature checking method and circuit based on thermistor |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150701 Termination date: 20160115 |
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| EXPY | Termination of patent right or utility model |