CN203191110U - Multi-channel temperature sampling and isolating circuit of photovoltaic inverter - Google Patents
Multi-channel temperature sampling and isolating circuit of photovoltaic inverter Download PDFInfo
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- CN203191110U CN203191110U CN 201320121847 CN201320121847U CN203191110U CN 203191110 U CN203191110 U CN 203191110U CN 201320121847 CN201320121847 CN 201320121847 CN 201320121847 U CN201320121847 U CN 201320121847U CN 203191110 U CN203191110 U CN 203191110U
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Abstract
The utility model relates to a sampling and isolating circuit and in particular to a multi-channel temperature sampling and isolating circuit of a photovoltaic inverter. The multi-channel temperature sampling and isolating circuit of the photovoltaic inverter comprises three phase modules of the inverter, wherein a temperature sampling module is arranged beside each phase module, an output end of the temperature sampling module of each phase is connected with a temperature comparison module through a filter module, output ends of the temperature comparison modules of all the three phases are connected with an isolating module after being connected in parallel, and an output end of the isolating module is connected with a DSP control module. By adopting the structure, multi-channel temperature sampling can be realized, the number of A/D sampling ports is reduced, and the sampling circuit is simplified. High voltage and low voltage can be isolated through the isolating module, and safety and reliability of a system can be improved.
Description
Technical field
The utility model relates to a kind of sampling buffer circuit, particularly a kind of photovoltaic DC-to-AC converter multi way temperature sampling buffer circuit.
Background technology
In three-phase high-power photovoltaic synchronization inverter, because the power model heating loss is big, adopt bigger heating radiator, the perhaps independent heating radiator of configuration of the power model of each brachium pontis usually.Adopt the temperature sampling of large-area heating radiator, generally place a NTC thermistor in each power model source, and the temperature sampling of a plurality of independent heating radiators, generally a NTC thermistor is placed at the power model place of each heating radiator.When like this temperature sampling signal being handled, traditional practice is each NTC thermistor, designs one road temperature sampling circuit, distributes an AD thief hatch; The advantage of this sample circuit is to realize the temperature of each point measuring, but shortcoming is to need a plurality of A/D mouths of configuration, and the A/D mouth resource-constrained of dsp processor can't meet the demands, if adopt outside A/D conversion chip, increased complicacy and the cost of circuit.
Summary of the invention
The utility model technical issues that need to address provide a kind of temperature sampling circuit that can reduce photovoltaic DC-to-AC converter A/D thief hatch.
For solving above-mentioned technical matters, the utility model is included in the other temperature sampling module that arranges of inverter three-phase module, described every phase temperature sampling module output terminal is connected with temperature comparison module after by filtration module, be connected with isolation module after the output terminal parallel connection of described every phase temperature comparison module, the output terminal of described isolation module is connected with the DSP control module, and described each module all is connected with power module.
Described temperature sampling module comprises thermistor and divider resistance, and described thermistor and divider resistance are connected in series, and the intermediate connection point of described thermistor and divider resistance is temperature sampling module output terminal.
Described temperature comparison module comprises amplifier and diode, and described diode cathode is connected the amplifier output terminal, and described temperature sampling module output terminal is connected with the amplifier input end, and described diode cathode is the temperature comparison module output terminal.
Described isolation module is optocoupler.
Described isolation module is the modulus isolating chip.
Be connected with the voltage follow module between described isolation module and the DSP control module.
After adopting said structure, the utility model can be realized the sampling of multi way temperature, reduces the A/D thief hatch, simplifies sample circuit.Realize the high-low pressure isolation by isolation module simultaneously, improve security and the reliability of system.
Description of drawings
Below in conjunction with the drawings and specific embodiments the utility model is described in further detail.
Fig. 1 is schematic block circuit diagram of the present utility model.
Fig. 2 is circuit theory diagrams of the present utility model.
Among the figure: 101 is the temperature sampling module, and 102 is filtration module, and 103 is temperature comparison module, and 104 is isolation module, and 105 is the voltage follow module, and 106 is the DSP control module, and 107 is power module
1 is power module first link, and 2 is power module second link, and 3 for modulus cuts off chip, and 4 is DSP control module link
Embodiment
As shown in Figure 1, photovoltaic DC-to-AC converter multi way temperature of the present utility model sampling buffer circuit comprises and connects temperature sampling module 101, filtration module 102, temperature comparison module 103, isolation module 104, voltage follow module 105, DSP control module 106 successively that each module described above is by power module 107 power supplies.
As shown in Figure 2, inverter comprises three-phase module, and photovoltaic DC-to-AC converter multi way temperature of the present utility model sampling buffer circuit be in the other temperature sampling module that arranges of described every phase module, and here only to wherein one illustrating mutually, other are two similar.The temperature sampling module of first phase comprises thermistor RT1 and divider resistance R2, described resistance R T1 and divider resistance R2 are connected in series, the other two ends of thermistor RT1 and divider resistance R2 are connected with power module second link 2 with power module first link 1 respectively, described power supply first even extreme 1 voltage is 5V, and power module second even extreme 2 voltage is 0V.The intermediate connection point of thermistor RT1 and divider resistance R2 is temperature sampling module output terminal like this, is the voltage on the divider resistance R2.Come the temperature of inductive inverter first phase module by thermistor RT1, the resistance of thermistor RT1 changes like this, voltage on the divider resistance R2 also changes, thereby the magnitude of voltage that detects is transferred to processor, and processor obtains the temperature value of each phase module of inverter by computing.
The described first phase temperature sampling module output terminal is connected with the first phase temperature comparison module after by filtration module, and filtration module is the RC wave filter that resistance R 1 and capacitor C 1 are formed here.The described first phase temperature comparison module comprises amplifier Q1 and diode D1, and described diode D1 positive pole is connected amplifier Q1 output terminal, and described temperature sampling module output terminal is connected with amplifier Q1 input end, and described diode D1 negative pole is the temperature comparison module output terminal.The output terminal of described every phase temperature comparison module is in parallel, if the temperature of thermistor RT1 is the highest like this, then the cathode voltage of D1 is greater than the anode voltage of D2 and D3, and then D2 and D3 end, and so only select the temperature detection of first phase.Detect the wherein temperature of a phase module of inverter by the mode of selecting like this, reach the purpose of multi way temperature sampling, saved the A/D thief hatch.Be connected with isolation module after the output terminal parallel connection of described every phase temperature comparison module, the output terminal of described isolation module is connected with the DSP control module.
Here, isolation module of the present utility model is modulus isolating chip 3, and the circuit between modulus isolating chip 3 and the temperature comparison module is to control in the scope that modulus isolating chip 3 can be used for filtering with input voltage; Equally, the circuit between modulus isolating chip 3 and the Q4 also is same effect.Be connected with the voltage follow module between described isolation module and the DSP control module, the voltage follow module comprises Q4, and the effect of Q4 is exactly that the voltage that guarantees input side and outgoing side is followed mutually.The effect of Q5 then is the reference voltage that 2.5V is provided for Q4.The output terminal of voltage follow module is connected with DSP control module link 4, handles thereby the magnitude of voltage that detects is transferred to the DSP control chip, and computing draws corresponding temperature value.
Certainly, isolation module of the present utility model also can adopt optocoupler or other isolating devices that is suitable for, and such conversion all drops within the protection domain of the present utility model.
Claims (6)
1. photovoltaic DC-to-AC converter multi way temperature sampling buffer circuit, be included in the other temperature sampling module that arranges of inverter three-phase module, it is characterized in that: described every phase temperature sampling module output terminal is connected with temperature comparison module after by filtration module, be connected with isolation module after the output terminal parallel connection of described every phase temperature comparison module, the output terminal of described isolation module is connected with the DSP control module, and described each module all is connected with power module.
2. according to the described photovoltaic DC-to-AC converter multi way temperature sampling of claim 1 buffer circuit, it is characterized in that: described temperature sampling module comprises thermistor and divider resistance, described thermistor and divider resistance are connected in series, and the intermediate connection point of described thermistor and divider resistance is temperature sampling module output terminal.
3. according to the described photovoltaic DC-to-AC converter multi way temperature sampling of claim 1 buffer circuit, it is characterized in that: described temperature comparison module comprises amplifier and diode, described diode cathode is connected the amplifier output terminal, described temperature sampling module output terminal is connected with the amplifier input end, and described diode cathode is the temperature comparison module output terminal.
4. according to the described photovoltaic DC-to-AC converter multi way temperature sampling of claim 1 buffer circuit, it is characterized in that: described isolation module is optocoupler.
5. according to the described photovoltaic DC-to-AC converter multi way temperature sampling of claim 1 buffer circuit, it is characterized in that: described isolation module is the modulus isolating chip.
6. according to the described photovoltaic DC-to-AC converter multi way temperature sampling of claim 1 buffer circuit, it is characterized in that: be connected with the voltage follow module between described isolation module and the DSP control module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320121847 CN203191110U (en) | 2013-03-17 | 2013-03-17 | Multi-channel temperature sampling and isolating circuit of photovoltaic inverter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320121847 CN203191110U (en) | 2013-03-17 | 2013-03-17 | Multi-channel temperature sampling and isolating circuit of photovoltaic inverter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203191110U true CN203191110U (en) | 2013-09-11 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320121847 Expired - Fee Related CN203191110U (en) | 2013-03-17 | 2013-03-17 | Multi-channel temperature sampling and isolating circuit of photovoltaic inverter |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107402078A (en) * | 2017-08-04 | 2017-11-28 | 昆山帝森克罗德光电技术有限公司 | A kind of three road temperature collection circuits for SVG products |
| CN109888717A (en) * | 2019-03-04 | 2019-06-14 | 上海沪工焊接集团股份有限公司 | A kind of temperature protection circuit of inverter type welder |
-
2013
- 2013-03-17 CN CN 201320121847 patent/CN203191110U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107402078A (en) * | 2017-08-04 | 2017-11-28 | 昆山帝森克罗德光电技术有限公司 | A kind of three road temperature collection circuits for SVG products |
| CN109888717A (en) * | 2019-03-04 | 2019-06-14 | 上海沪工焊接集团股份有限公司 | A kind of temperature protection circuit of inverter type welder |
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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 | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130911 Termination date: 20180317 |