CN203456860U - IPM module protection circuit with adjustable current and air conditioner - Google Patents
IPM module protection circuit with adjustable current and air conditioner Download PDFInfo
- Publication number
- CN203456860U CN203456860U CN201320526235.5U CN201320526235U CN203456860U CN 203456860 U CN203456860 U CN 203456860U CN 201320526235 U CN201320526235 U CN 201320526235U CN 203456860 U CN203456860 U CN 203456860U
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- ipm module
- protection value
- switching tube
- divider resistance
- protective circuit
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Abstract
The utility model relates to the field of protection circuits, and especially relates to an IPM module protection circuit with an adjustable current and an air conditioner. According to the utility model, a protection value adjusting unit, which can adjust a protection value of an IPM module in real time according to the needs of various types of environments, is added based on a conventional overcurrent protection circuit, so as to carry out effective overcurrent protection for the IPM module. The protection circuit provided by the utility model is simple and reliable in design, is low in cost, and is easy to achieve and popularize.
Description
Technical field
The utility model belongs to protective circuit field, relates in particular to a kind of protective circuit of IPM module adjustable current protection value and has comprised the air conditioner of this protective circuit.
Background technology
In current IPM module application; conventionally by mode as shown in Figure 1, connect current foldback circuit; as shown in the figure: the lower brachium pontis output of IPM module is connected to one end of a sampling resistor R1, and be connected to the overcurrent protection pin of IPM module, the other end ground connection of sampling resistor R1 simultaneously.
When circuit works, electric current is by the lower brachium pontis of IPM module, and the sampling resistor R1 that flows through, then gets back to the ground of power supply, so can produce a pressure drop on sampling resistor R1 and be input to the overcurrent protection pin of IPM module; When this voltage drop reaches the protection value of IPM module, now module can produce protection automatically.As can be seen here, the current protection value of this IPM module determines by sampling resistor R1, and when sampling resistor is fixedly time, the current protection value of IPM module is also fixed value.
With regard to causing, there is a problem like this: when environment changes; can not adjust in real time according to the variation of environment the current protection value of IPM module; easily cause IPM module (as high temperature) under a certain environment to protect because of too high can not get of current protection value; thereby cause the damage of device; even damage equipment, cause the danger such as fire.
Utility model content
In view of this; the purpose of this utility model is to provide a kind of protective circuit of IPM module adjustable current protection value; to realize the current protection value of IPM module, with environmental change, adjust in real time; solved that under varying environment current protection value is fixed and the protection that causes was lost efficacy and then damaged device and equipment, even caused other dangerous technical problems.
The protective circuit of the IPM module adjustable current protection value that the utility model provides; comprise that one is connected to the sampling resistor R1 between brachium pontis output and ground under IPM module; as improvement, described protective circuit also comprises: be connected under IPM module between brachium pontis output and overcurrent protection pin, can be according to the protection value adjustment unit of the current protection value that need to adjust IPM module of operational environment.
Particularly, described protection value adjustment unit comprises switching tube Q1 and controller, divider resistance R2 and divider resistance R3; The public connecting end of brachium pontis output under sampling resistor R1 and IPM module described in the first termination of described divider resistance R2; the second end of described divider resistance R2 connects the first end of described IPM module overcurrent protection pin and divider resistance R3 simultaneously; the hot end of switching tube Q1 described in the second termination of described divider resistance R3; the cold end ground connection of described switching tube Q1, controller described in the control termination of described switching tube Q1.
Further, described switching tube Q1 is NMOS pipe, and the drain electrode of described NMOS pipe is the hot end of described switching tube Q1, and the source electrode of described NMOS pipe is the cold end of described switching tube Q1, and the grid of described NMOS pipe is the control end of described switching tube Q1; Or described switching tube Q1 is a relay.
Further, described divider resistance R3 is NTC negative tempperature coefficient thermistor; Or described divider resistance R3 is PTC semistor; Or described divider resistance R3 is the fixing resistor of resistance.
On the other hand, the utility model also provides a kind of air conditioner, and this air conditioner has comprised the protective circuit of above-mentioned IP M module adjustable current protection value.
The protective circuit of the IPM module adjustable current protection value that the utility model provides and comprise the air conditioner of this protective circuit; on the basis of existing current foldback circuit; increased by one can be according to the needs of different operational environments, adjust in real time the protection value adjustment unit of the current protection value of IPM module, IPM module is carried out to effective overcurrent protection.Its circuit design is simple and reliable, and cost low, be easy to realize and promote.
Accompanying drawing explanation
Fig. 1 is the connection diagram of the current foldback circuit of IPM module in prior art;
Fig. 2 is the structure money figure of the protective circuit of the IPM module adjustable current protection value that provides of the utility model embodiment;
Fig. 3 is a kind of electronic device schematic diagram of the protective circuit of the IPM module adjustable current protection value that provides of the utility model embodiment.
Embodiment
In order to make the purpose of this utility model, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the utility model is further elaborated.Should be appreciated that specific embodiment described herein is only in order to explain the utility model, and be not used in restriction the utility model.
Fig. 2 is the structure money figure of the protective circuit of the IPM module adjustable current protection value that provides of the utility model embodiment; For convenience of explanation, only show the part relevant to the present embodiment, as shown in the figure:
The protective circuit of the IPM module adjustable current protection value that the utility model provides; comprise that one is connected to the sampling resistor R1 between brachium pontis output and ground under IPM module; as improvement; described protective circuit also comprises and is connected to the protection value adjustment unit 10 between brachium pontis output and overcurrent protection pin under IPM module; this protection value adjustment unit 10 can, according to the needs of different operating environment, be realized the current protection value of adjusting in real time IPM module.
As a preferred embodiment, described protection value adjustment unit 10 comprises switching tube Q1 and controller, divider resistance R2 and divider resistance R3; The public connecting end of brachium pontis output under the first termination sampling resistor R1 of divider resistance R2 and IPM module; the second end of divider resistance R2 connects the first end of IPM module overcurrent protection pin and divider resistance R3 simultaneously; the hot end of the second termination switching tube Q1 of divider resistance R3; the cold end ground connection of switching tube Q1; controller described in the control termination of switching tube Q1, realizes the control to switching tube Q1 break-make by controller.
In practical work process, sampling resistor R1 samples to flowing through the electric current of IPM module:
When switching tube Q1 conducting; the voltage that sampling resistor R1 sampling obtains after divider resistance R2 and divider resistance R3 dividing potential drop, flow into the overcurrent protection pin of IPM module, the voltage that is input to IPM module overcurrent protection pin needs divider resistance R2, divider resistance R3 dividing potential drop and obtains.When the magnitude of voltage obtaining reaches voltage (electric current) the protection value of IPM module, IPM module is carried out to overcurrent protection after dividing potential drop.
When switching tube Q1 turn-offs; the sampled voltage of sampling resistor R1 directly outputs to the overcurrent protection pin of IPM module; now do not have the dividing potential drop (divider resistance R3 disconnects, and divider resistance R2 has been exactly now the function of a current-limiting resistance) through divider resistance R2 and divider resistance R3.Therefore, in the situation that the sampled voltage of sampling resistor R1 is identical, be now input to the voltage of the IPM module overcurrent protection pin voltage can be than switching tube Q1 conducting time high, therefore, the corresponding now current protection value of IPM module is minimum value.When the sampled voltage of sampling resistor R1 reaches the current protection value of IPM module, IPM module is protected.
In specific implementation process, divider resistance R3 can be the fixing resistor of resistance, can be also the resistor that the resistances such as temperature sensor can change according to variation of ambient temperature.Specifically, divider resistance R3 can be the common fixing resistor of resistance, can be also NTC negative tempperature coefficient thermistor or for PTC semistor.
Further, divider resistance R3 should carry out type selecting according to actual applicable cases: when divider resistance R3 selects NTC negative tempperature coefficient thermistor, its resistance reduces along with the rising of temperature, when flowing through electric current one timing of sampling resistor R1, the voltage that is input to IPM module overcurrent protection pin will reduce, therefore, the magnitude of voltage that is input to IPM module overcurrent protection pin as made reaches the protection value of IPM module, needs to increase the current value that flows through sampling resistor R1; Be that IPM blocks current protection value raises along with the rising of temperature.
In like manner; when divider resistance R3 selects PTC semistor; its resistance raises along with the rising of temperature; when flowing through electric current one timing of sampling resistor R1; the voltage that is input to IPM module overcurrent protection pin can raise, and IPM blocks current protection value reduces along with the rising of temperature.
When divider resistance R3 selects the resistor of fixed resistance value, during due to switching tube Q1 conducting, divider resistance R2 and divider resistance R3 dividing potential drop ratio be fixed value, therefore, now current protection value is also fixing value.That is to say, current protection value now has two grades can select, and conducting or the shutoff by switching tube Q1 realizes respectively.
In specific implementation process, the preferred conduction voltage drop of switching tube Q1 is less than the device of 50 times of magnitudes of voltage of the overcurrent protection pin of IPM module.Particularly, switching tube Q1 can manage for NMOS, and the drain electrode of NMOS pipe is the hot end of switching tube Q1, and the source electrode of NMOS pipe is the cold end of switching tube Q1, and the grid of NMOS pipe is the control end of switching tube Q1.Certainly, switching tube Q1 also can be for a conduction voltage drop relay of 50 times of IPM module overcurrent protection pin voltage values to the maximum.
Referring to Fig. 3, Fig. 3 is a kind of electronic device schematic diagram of the protective circuit of the IPM module adjustable current protection value that provides of the present embodiment.Suppose and apply on air conditioner, the switching tube Q1 in this example is the NMOS pipe of selecting, and divider resistance R3 is temperature sensor, can be connected to the ambient temperature outside air conditioner chamber.When air conditioner outdoor environment temperature is higher, controller output control signal is managed Q1 by NMOS and is turn-offed, and now the current protection value of IPM module is minimum value; When air conditioner outdoor environment temperature is not high, controller is exported again control signal, and NMOS is managed to Q1 conducting, and now the current protection value of IPM module changes according to the variation of outdoor environment temperature.When flowing through the electric current of IPM module and reach IPM blocks current protection value, IPM module is protected, in conjunction with aforementioned content, specific works process does not just repeat at this.
The utility model embodiment also provides a kind of air conditioner, and this air conditioner has just comprised the protective circuit of above-mentioned IPM module adjustable current protection value.
The protective circuit of the IPM module adjustable current protection value providing according to the utility model and comprise the air conditioner of this protective circuit; on the basis of existing current foldback circuit; increased by one can be according to the needs of different operational environments, adjust in real time the protection value adjustment unit of the current protection value of IPM module, IPM module is carried out to effective overcurrent protection.Its circuit design is simple and reliable, and cost low, be easy to realize and promote.
The foregoing is only preferred embodiment of the present utility model, not in order to limit the utility model, although the utility model has been carried out to more detailed explanation with reference to previous embodiment, for a person skilled in the art, its technical scheme that still can record aforementioned each embodiment is modified or part technical characterictic is wherein equal to replacement.All any modifications of doing within spirit of the present utility model and principle, be equal to and replace and improvement etc., within all should being included in protection range of the present utility model.
Claims (8)
1. a protective circuit for IPM module adjustable current protection value, comprises that one is connected to the sampling resistor R1 between brachium pontis output and ground under IPM module, it is characterized in that, described protective circuit also comprises:
Be connected under IPM module between brachium pontis output and overcurrent protection pin, can be according to the protection value adjustment unit of the current protection value that need to adjust IPM module of operational environment.
2. the protective circuit of IPM module adjustable current protection value as claimed in claim 1, is characterized in that, described protection value adjustment unit comprises switching tube Q1 and controller, divider resistance R2 and divider resistance R3;
The public connecting end of brachium pontis output under sampling resistor R1 and IPM module described in the first termination of described divider resistance R2; the second end of described divider resistance R2 connects the first end of described IPM module overcurrent protection pin and divider resistance R3 simultaneously; the hot end of switching tube Q1 described in the second termination of described divider resistance R3; the cold end ground connection of described switching tube Q1, controller described in the control termination of described switching tube Q1.
3. the protective circuit of IPM module adjustable current protection value as claimed in claim 2; it is characterized in that; described switching tube Q1 is NMOS pipe; the drain electrode of described NMOS pipe is the hot end of described switching tube Q1; the source electrode of described NMOS pipe is the cold end of described switching tube Q1, and the grid of described NMOS pipe is the control end of described switching tube Q1.
4. the protective circuit of IPM module adjustable current protection value as claimed in claim 2, is characterized in that, described switching tube Q1 is a relay.
5. the protective circuit of IPM module adjustable current protection value as claimed in claim 2, is characterized in that, described divider resistance R3 is NTC negative tempperature coefficient thermistor.
6. the protective circuit of IPM module adjustable current protection value as claimed in claim 2, is characterized in that, described divider resistance R3 is PTC semistor.
7. the protective circuit of IPM module adjustable current protection value as claimed in claim 2, is characterized in that, described divider resistance R3 is the fixing resistor of resistance.
8. an air conditioner, is characterized in that, described air conditioner has comprised the protective circuit of the IPM module adjustable current protection value as described in claim 1-7 any one.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320526235.5U CN203456860U (en) | 2013-08-27 | 2013-08-27 | IPM module protection circuit with adjustable current and air conditioner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320526235.5U CN203456860U (en) | 2013-08-27 | 2013-08-27 | IPM module protection circuit with adjustable current and air conditioner |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203456860U true CN203456860U (en) | 2014-02-26 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320526235.5U Expired - Lifetime CN203456860U (en) | 2013-08-27 | 2013-08-27 | IPM module protection circuit with adjustable current and air conditioner |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203456860U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104279703A (en) * | 2014-09-30 | 2015-01-14 | 广东美的制冷设备有限公司 | Air conditioner and circuit board thereof |
| WO2015149562A1 (en) * | 2014-04-02 | 2015-10-08 | 美的集团股份有限公司 | Air conditioner and compressor protection circuit thereof |
| CN106911125A (en) * | 2017-03-13 | 2017-06-30 | 广东美的制冷设备有限公司 | SPM and its control method, air-conditioner |
| WO2018166074A1 (en) * | 2017-03-13 | 2018-09-20 | 广东美的制冷设备有限公司 | Intelligent power module and air conditioner |
-
2013
- 2013-08-27 CN CN201320526235.5U patent/CN203456860U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015149562A1 (en) * | 2014-04-02 | 2015-10-08 | 美的集团股份有限公司 | Air conditioner and compressor protection circuit thereof |
| CN104279703A (en) * | 2014-09-30 | 2015-01-14 | 广东美的制冷设备有限公司 | Air conditioner and circuit board thereof |
| CN106911125A (en) * | 2017-03-13 | 2017-06-30 | 广东美的制冷设备有限公司 | SPM and its control method, air-conditioner |
| WO2018166074A1 (en) * | 2017-03-13 | 2018-09-20 | 广东美的制冷设备有限公司 | Intelligent power module and air conditioner |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20140226 |
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| CX01 | Expiry of patent term |