CN206056815U - New isolated temperature sampling apparatuses - Google Patents
New isolated temperature sampling apparatuses Download PDFInfo
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- CN206056815U CN206056815U CN201620991980.0U CN201620991980U CN206056815U CN 206056815 U CN206056815 U CN 206056815U CN 201620991980 U CN201620991980 U CN 201620991980U CN 206056815 U CN206056815 U CN 206056815U
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- circuit
- voltage
- critesistor
- temperature sampling
- new isolated
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Abstract
This utility model belongs to photovoltaic inversion device assembly, more particularly to a kind of strong antijamming capability and the new isolated temperature sampling apparatuses suitable for long-distance transmissions.New isolated temperature sampling apparatuses, including critesistor, it is characterised in that：Including the sample circuit being connected with critesistor, current signal is converted to voltage signal by sample circuit, described sample circuit is connected with freq converting circuit, the voltage signal that sample circuit is passed over is converted to frequency signal by freq converting circuit, freq converting circuit is connected with high speed photo coupling isolation circuit, high speed photo coupling isolation circuit is connected with voltage conversion circuit, and frequency signal is converted to voltage signal by voltage conversion circuit.This utility model designs a kind of strong antijamming capability and the new isolated temperature sampling apparatuses suitable for long-distance transmissions.
Description
Technical field
This utility model belongs to photovoltaic inversion device assembly, more particularly to a kind of strong antijamming capability and is applied to remote biography
Defeated new isolated temperature sampling apparatuses.
Background technology
The device that temperature detection is carried out using IGBT module itself critesistor (NTC) is widely used in all kinds of power electronics
In unsteady flow equipment, the working condition of whole machine can be grasped by the detection to IGBT module temperature, when module temperature it is too high, it is central
Control chip can perform load shedding even halt instruction, protection module, it is to avoid cross cause thermal damage；When module temperature is too low, central authorities are controlled
Coremaking piece can perform the instruction such as cold-starting, make membrane capacitance gradually heat up and reach rated capacity, and guarantee equipment normally runs.
As IGBT module is normally operated in the environment of high pressure, high current, strong electromagnetic, it is therefore desirable to temperature sampling
Device reaches the requirement such as remote, anti-interference, electrical isolation, high accuracy.Traditional temperature acquisition apparatus, by critesistor with
After another resistant series partial pressure, sampled voltage calculates NTC resistances according to magnitude of voltage, then by NTC resistances and temperature comparisons' table
Lattice, acquisition temperature of tabling look-up.But the device is suffered from the drawback that：1st, the unrealized electrical isolation of the device, IGBT failures may cause
High pressure is delivered to vulnerabilities scan part by the device, causes whole control circuit failure；2nd, the device is carrying out electricity at a distance
During pressure sampling, it is vulnerable to the interference of strong-electromagnetic field, causes sampling inaccurate or even sample by mistake.
The content of the invention
This utility model is directed to the deficiencies in the prior art, and this utility model designs a kind of strong antijamming capability and is applied to remote
The new isolated temperature sampling apparatuses of Distance Transmission.
The technical solution of the utility model is as follows：
New isolated temperature sampling apparatuses, including critesistor, it is characterised in that：Including the sampling being connected with critesistor
Current signal is converted to voltage signal by circuit, sample circuit, and described sample circuit is connected with freq converting circuit, and frequency turns
Change circuit and the voltage signal that sample circuit is passed over be converted to into frequency signal, freq converting circuit be connected with high speed photo coupling every
From circuit, high speed photo coupling isolation circuit is connected with voltage conversion circuit, and frequency signal is converted to voltage letter by voltage conversion circuit
Number.
Described sample circuit includes first resistor R1 connected with critesistor, also includes in parallel with critesistor
Two resistance R3, are connected with the positive input of voltage follower by connecting line between first resistor R1 and critesistor, electricity
The outfan of pressure follower is connected with the outfan of freq converting circuit.
Described freq converting circuit is AD7740 synchronizing voltage frequency converters.
Described high speed photo coupling isolation circuit is TLP115A High-Speed Coupled Devices.
Described voltage conversion circuit is LM331 accurate voltage frequency converters.
In sum, this utility model has the advantages that：
This utility model is by by temperature transition, into frequency signal, after light-coupled isolation, reconvert is into voltage signal, real
Existing long-distance transmissions, are convenient for remotely control, strong antijamming capability, it is to avoid the signal of survey receives the interference of strong-electromagnetic field, protect
The precision of sampling is demonstrate,proved, the error of sampling has been reduced, further, circuit structure of the present utility model is simple, low cost of manufacture, and
Sampling precision is high.
Description of the drawings
Fig. 1 is composition schematic diagram of the present utility model；
In figure, 1 is sample circuit, and 2 is freq converting circuit, and 3 is high speed photo coupling isolation circuit, and 4 is voltage conversion circuit,
11 is first resistor, and 12 is critesistor, and 13 is second resistance, and 14 is voltage follower.
Specific embodiment
Below in conjunction with the accompanying drawings this utility model is described further.
As shown in figure 1, new isolated temperature sampling apparatuses, including critesistor 12, including what is be connected with critesistor 12
Current signal is converted to voltage signal by sample circuit 1, sample circuit 1, and described sample circuit 1 is connected with freq converting circuit
2, the voltage signal that sample circuit is passed over is converted to frequency signal by freq converting circuit 2, and freq converting circuit 2 is connected with
High speed photo coupling isolation circuit 3, high speed photo coupling isolation circuit 3 are connected with voltage conversion circuit 4, and frequency is believed by voltage conversion circuit 4
Number be converted to voltage signal.
Described sample circuit includes first resistor R1 connected with critesistor, also includes in parallel with critesistor
Two resistance R3, are connected with the positive input of voltage follower by connecting line between first resistor R1 and critesistor, electricity
The outfan of pressure follower is connected with the outfan of freq converting circuit.
Described freq converting circuit is AD7740 synchronizing voltage frequency converters.
Described high speed photo coupling isolation circuit is TLP115A High-Speed Coupled Devices.
Described voltage conversion circuit is LM331 accurate voltage frequency converters.
The course of work of the present utility model：
1st, the temperature change of IGBT module, with temperature change, the resistance of critesistor changes, by partial pressure and electricity
Pressure follows conversion in voltage signal；
2nd, by freq converting circuit, by voltage signal conversion in frequency signal, voltage signal is not suitable for the biography of long range
It is defeated, and easily receive the interference of external signal；
3rd, high speed photo coupling isolation circuit is isolated；
4th, voltage signal is converted frequency signals into by voltage conversion circuit, is processed for follow-up processing equipment；
In sum, this utility model has the advantages that：
This utility model is by by temperature transition, into frequency signal, after light-coupled isolation, reconvert is into voltage signal, real
Existing long-distance transmissions, are convenient for remotely control, strong antijamming capability, it is to avoid the signal of survey receives the interference of strong-electromagnetic field, protect
The precision of sampling is demonstrate,proved, the error of sampling has been reduced, further, circuit structure of the present utility model is simple, low cost of manufacture, and
Sampling precision is high.
Claims (5)
1. new isolated temperature sampling apparatuses, including critesistor, it is characterised in that：Including the sampling electricity being connected with critesistor
Current signal is converted to voltage signal by road, sample circuit, and described sample circuit is connected with freq converting circuit, frequency conversion
The voltage signal that sample circuit is passed over is converted to frequency signal by circuit, and freq converting circuit is connected with high speed photo coupling isolation
Circuit, high speed photo coupling isolation circuit are connected with voltage conversion circuit, and frequency signal is converted to voltage signal by voltage conversion circuit.
2. new isolated temperature sampling apparatuses according to claim 1, it is characterised in that：Described sample circuit include with
First resistor R1 of critesistor series connection, also includes second resistance R3 in parallel with critesistor, in first resistor R1 and temperature-sensitive
It is connected with the positive input of voltage follower by connecting line between resistance, outfan and the frequency conversion electricity of voltage follower
The outfan connection on road.
3. new isolated temperature sampling apparatuses according to claim 1, it is characterised in that：Described freq converting circuit is
AD7740 synchronizing voltage frequency converters.
4. new isolated temperature sampling apparatuses according to claim 1, it is characterised in that：Described high speed photo coupling isolation electricity
Road is TLP115A High-Speed Coupled Devices.
5. new isolated temperature sampling apparatuses according to claim 1, it is characterised in that：Described voltage conversion circuit is
LM331 accurate voltage frequency converters.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620991980.0U CN206056815U (en) | 2016-08-30 | 2016-08-30 | New isolated temperature sampling apparatuses |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620991980.0U CN206056815U (en) | 2016-08-30 | 2016-08-30 | New isolated temperature sampling apparatuses |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206056815U true CN206056815U (en) | 2017-03-29 |
Family
ID=58378470
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620991980.0U Expired - Fee Related CN206056815U (en) | 2016-08-30 | 2016-08-30 | New isolated temperature sampling apparatuses |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206056815U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108981951A (en) * | 2018-08-16 | 2018-12-11 | 江苏镇安欣润电力科技有限公司 | A kind of IGBT temperature detection circuit and its detection method |
| CN110031123A (en) * | 2018-01-04 | 2019-07-19 | 联发科技股份有限公司 | Heat sensor integrated circuit and resistor for heat sensor |
-
2016
- 2016-08-30 CN CN201620991980.0U patent/CN206056815U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110031123A (en) * | 2018-01-04 | 2019-07-19 | 联发科技股份有限公司 | Heat sensor integrated circuit and resistor for heat sensor |
| CN110031123B (en) * | 2018-01-04 | 2021-06-22 | 联发科技股份有限公司 | Thermal sensor integrated circuit and resistor for thermal sensor |
| US11467041B2 (en) | 2018-01-04 | 2022-10-11 | Mediatek Inc. | Thermal sensor integrated circuit, resistor used in thermal sensor and method for detecting temperature |
| CN108981951A (en) * | 2018-08-16 | 2018-12-11 | 江苏镇安欣润电力科技有限公司 | A kind of IGBT temperature detection circuit and its detection method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20170329 Termination date: 20180830 |
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| CF01 | Termination of patent right due to non-payment of annual fee |