CN202797890U - Direct current inverter air conditioner and compressor driving current protection circuit - Google Patents
Direct current inverter air conditioner and compressor driving current protection circuit Download PDFInfo
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- CN202797890U CN202797890U CN2012204168281U CN201220416828U CN202797890U CN 202797890 U CN202797890 U CN 202797890U CN 2012204168281 U CN2012204168281 U CN 2012204168281U CN 201220416828 U CN201220416828 U CN 201220416828U CN 202797890 U CN202797890 U CN 202797890U
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Abstract
The utility model belongs to the field of an air conditioner, and especially relates to a direct current inverter air conditioner and a compressor driving current protection circuit. The circuit comprises an IPM (intelligent power module) driving unit, a three-phase current monitoring unit, a filtering unit and a comparison determination unit. The IPM driving unit is used for receiving a control signal output from a main chip to drive a compressor to run and handling based on abnormal cases of current. The three-phase current monitoring unit is used for monitoring whether a three-phase current waveform of the compressor is abnormal. The filtering unit is connected with the three-phase current monitoring unit and is used for filtering a received current waveform signal. The comparison determination unit is used for receiving current information output by the filtering unit and determining and handling the information. The advantages are that the whole compressor driving current protection circuit is rapid in response, high in response precision and low in cost, is simple and is equipped with fewer components.
Description
Technical field
The utility model belongs to the air conditioner field, relates in particular to a kind of direct current varied-frequency air conditioner and driven compressor current protecting circuit.
Background technology
In the air conditioner field, converter technique is an emerging technology, and it is to change supply frequency by frequency converter, thereby changes a kind of technology of the running rotating speed of compressor.Direct current varied-frequency air conditioner refers to adopt the air conditioner of DC inverted frequency control system and corresponding DC frequency-changeable compressor, and energy-saving effect is the strongest, and the highest power saving capability reaches 48%; Temperature control technique is more accurate, and temperature fluctuation is in 0.5 ℃; Also have simultaneously the advantages such as low voltage starting, muting function be more obvious.
In general; the driven compressor current protection judges by regulating the protection trigger voltage whether compressor current is unusual exactly; and impel IPM(Intelligent Power Module, Intelligent Power Module) module makes corresponding actions to reach the effect of protective circuit.Our air conditioner mostly was greatly single-phase in the past, and electric current is less, along with the air conditioner scope of application more and more wider, require more and more highlyer, the air conditioner of three phase mains just arises at the historic moment.The air conditioner of three phase mains just means that in use compressor current is larger, how it is effectively protected to seem most important in such overload operation process.
Existing protective circuit generally adopts single resistance to carry out controlling of sampling; this method in actual applications; writing of its software algorithm is loaded down with trivial details, and the current error that sampling calculates is also larger, can not satisfy the requirement that the compressor of three-phase dc transducer air conditioning is protected fully.
The utility model content
The purpose of this utility model is to provide a kind of driven compressor current protecting circuit, utilizes low-cost device general on the market, has solved effective protection problem of compressor when the three-phase dc transducer air conditioning turned round, power device.
In order to achieve the above object, the technical solution adopted in the utility model is:
A kind of driven compressor current protecting circuit is joined with the master chip of direct current varied-frequency air conditioner, comprising:
Link to each other with described master chip, receive the control signal drive compression machine running of described master chip output and the IPM driver element of dealing with according to the current anomaly situation;
Link to each other with the output of described IPM driver element, monitor whether unusual three-phase current monitoring means of described compressor three-phase current waveform;
Link to each other with described three-phase current monitoring means, the current waveform signal that receives is carried out the filter unit that filtering is processed; And
Be connected between described filter unit and the described IPM driver element, receive the current information of described filter unit output and the comparison judgment unit of judging and processing.
Particularly, described IPM driver element comprises IPM module I C1, the first electrochemical capacitor E1, the second electrochemical capacitor E2, the 3rd electrochemical capacitor E3, the 7th ceramic disc capacitor C7, the 8th ceramic disc capacitor C8 and the 9th ceramic disc capacitor C9; The W+ of described IPM module I C1, U+, V+, W-, U-and V-pin join with described master chip respectively, the W+ of IPM module I C1 wherein, U+, the V+ pin corresponds respectively to W phase winding starting end, phase winding starting end and V phase winding starting end, and W-, U-and V-pin correspond respectively to the W phase winding and finish end, phase winding finishes end and the V phase winding finishes end, the W of correspondence three phase windings of described IPM module I C1, V, the U pin is three outputs of described IPM driver element, link to each other with three inputs of described three-phase current monitoring means respectively, the fault-signal of described IPM module I C1 detects the output that pin FAULT pin connects described comparison judgment unit, the positive pole of described the first electrochemical capacitor E1, the positive pole of the second electrochemical capacitor E2, the positive pole of the 3rd electrochemical capacitor E3 meets respectively the VB3 of described IPM module I C1, VB2, the VB1 pin, here the VB3 of IPM module I C1, VB2, the VB1 pin is respectively W phase boostrap circuit pin, V phase boostrap circuit pin and U be the boostrap circuit pin mutually, the negative pole of described the first electrochemical capacitor E1, the negative pole of the second electrochemical capacitor E2, the negative pole of the 3rd electrochemical capacitor E3 meets respectively the W of correspondence three phase windings of described IPM module I C1, V, the U pin, described the 7th ceramic disc capacitor C7, the 8th ceramic disc capacitor C8 and the 9th ceramic disc capacitor C9 are attempted by respectively described the first electrochemical capacitor E1, the second electrochemical capacitor E2, the two ends of the 3rd electrochemical capacitor E3.
Further, described IPM module I C1 is STK621-033C-E.
Particularly, described three-phase current monitoring means comprises the 7th resistance R 7, the 8th resistance R 8, the 9th resistance R 9; The first end of the first end of the first end of described the 7th resistance R 7, the 8th resistance R 8, the 9th resistance R 9 is three inputs of described three-phase current monitoring means, connect respectively three outputs of described IPM driver element, the second end of the second end of described the 7th resistance R 7, the 8th resistance R 8, the second end of the 9th resistance R 9 be ground connection all.
Particularly, described filter unit comprises the first ceramic disc capacitor C1, the second ceramic disc capacitor C2, the 3rd ceramic disc capacitor C3, the first resistance R 1, the second resistance R 2 and the 3rd resistance R 3; The first end of described the first resistance R 1, the first end of the first end of the second resistance R 2 and the 3rd resistance R 3 connects respectively the second end of described the 9th resistance R 9, the second end of the second end of the 8th resistance R 8 and the 7th resistance R 7, the second end of described the first resistance R 1, the second end of the second end of the second resistance R 2 and the 3rd resistance R 3 is respectively the 3rd output of described filter unit, the second output and the first output, described the first ceramic disc capacitor C1 is connected between second end and ground of described the first resistance R 1, described the second ceramic disc capacitor C2 is connected between second end and ground of described the second resistance R 2, and described the 3rd ceramic disc capacitor C3 is connected between second end and ground of described the 3rd resistance R 3.
Particularly, described comparison judgment unit comprises the first operational amplifier A D1, the second operational amplifier A D2, the 3rd operational amplifier A D3, four-operational amplifier AD4, the 4th resistance R 4, the 5th resistance R 5, the 6th resistance R 6, the tenth resistance R 10, the 11 resistance R 11, the 4th ceramic disc capacitor C4, the 5th ceramic disc capacitor C5 and the 6th ceramic disc capacitor C6; The inverting input of described the first operational amplifier A D1, the inverting input of the second operational amplifier A D2, the inverting input of the 3rd operational amplifier A D3 connects respectively the first output of described filter unit, the second output and the 3rd output, described the 4th resistance R 4, the 5th resistance R 5, the 6th resistance R 6 is connected between DC power supply and the ground successively, described the 4th ceramic disc capacitor C4 is attempted by between the public connecting end and ground of described the 4th resistance R 4 and the 5th resistance R 5, described the 5th ceramic disc capacitor C5 is attempted by between the public connecting end and ground of described the 5th resistance R 5 and the 6th resistance R 6, the normal phase input end of described the first operational amplifier A D1, the normal phase input end of the second operational amplifier A D2, the normal phase input end of the 3rd operational amplifier A D3 connects the public connecting end of described the 5th resistance R 5 and the 6th resistance R 6 simultaneously, described the 6th ceramic disc capacitor C6 is attempted by between the power end and ground of described the 3rd operational amplifier A D3, the output of described the first operational amplifier A D1, the output of the second operational amplifier A D2, the output of the 3rd operational amplifier A D3 is connected to the inverting input of described four-operational amplifier AD4 altogether, described the tenth resistance R 10 is connected between the inverting input and ground of described four-operational amplifier AD4, the normal phase input end of described four-operational amplifier AD4 connects the public connecting end of described the 4th resistance R 4 and the 5th resistance R 5, the FAULT pin of the described IPM module I of the output termination C1 of described four-operational amplifier AD4, described the 11 resistance R 11 is connected between the output and DC power supply of described four-operational amplifier AD4.
Further, described the first operational amplifier A D1, the second operational amplifier A D2, the 3rd operational amplifier A D3, four-operational amplifier AD4 are LM393.
The purpose of this utility model also is to provide a kind of direct current varied-frequency air conditioner, and described air conditioner comprises the driven compressor current protecting circuit of above-mentioned any one form.
The direct current varied-frequency air conditioner that the utility model provides and driven compressor current protecting circuit thereof; the fast response time of protective circuit; response accuracy is high; circuit integral body is also fairly simple; the device that adopts less; cost is lower, has effectively realized compressor when direct current varied-frequency air conditioner turned round and the protection of power device.
Description of drawings
Fig. 1 is the structured flowchart of the driven compressor current protecting circuit that provides of the utility model embodiment;
Fig. 2 is the example electronic devices and components figure of the driven compressor current protecting circuit 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 only in order to explaining the utility model, and be not used in restriction the utility model.
The utility model provides a kind of direct current varied-frequency air conditioner and driven compressor current protecting circuit; described circuit comprises IPM driver element, three-phase current monitoring means, filter unit and comparison judgment unit; its advantage is: fast response time; response accuracy is high; circuit is fairly simple; the device that adopts is less, and cost is lower.
Fig. 1 is the structured flowchart of the driven compressor current protecting circuit that provides of the utility model embodiment; For convenience of explanation, only show the part relevant with present embodiment.As shown in the figure:
A kind of driven compressor current protecting circuit is joined with the master chip 000 of direct current varied-frequency air conditioner, comprising: IPM driver element 100, three-phase current monitoring means 200, filter unit 300 and comparison judgment unit 400;
Wherein, IPM driver element 100 links to each other with master chip 000, and the control signal drive compression machine that receives master chip 000 output turns round and deals with according to the current anomaly situation; Three-phase current monitoring means 200 links to each other with the output of IPM driver element 100, and whether monitoring compressor three-phase current waveform is unusual; Filter unit 300 links to each other with three-phase current monitoring means 200, the current waveform signal that receives is carried out filtering process; Comparison judgment unit 400 is connected between filter unit 300 and the IPM driver element 100, and the current information of unit 300 output that accepts filter is also judged and processed.
Fig. 2 is the example electronic devices and components figure of the driven compressor current protecting circuit that provides of the utility model embodiment; For convenience of explanation, only show the part relevant with present embodiment.As shown in the figure:
As an embodiment of the present utility model, IPM driver element 100 comprises IPM module I C1, the first electrochemical capacitor E1, the second electrochemical capacitor E2, the 3rd electrochemical capacitor E3, the 7th ceramic disc capacitor C7, the 8th ceramic disc capacitor C8 and the 9th ceramic disc capacitor C9; As a preferred embodiment of the present utility model, IPM module I C1 selects the STK621-033C-E module.The W+ of IPM module I C1, U+, V+, W-, U-and V-pin join with master chip 000 respectively, the W of IPM module I C1, V, the U pin is three outputs of IPM driver element 100, link to each other with three inputs of three-phase current monitoring means 200 respectively, the FAULT pin of IPM module I C1 connects the output of comparison judgment unit 400, the positive pole of the first electrochemical capacitor E1, the positive pole of the second electrochemical capacitor E2, the positive pole of the 3rd electrochemical capacitor E3 meets respectively the VB3 of IPM module I C1, VB2, the VB1 pin, the negative pole of the first electrochemical capacitor E1, the negative pole of the second electrochemical capacitor E2, the negative pole of the 3rd electrochemical capacitor E3 meets respectively the W of IPM module I C1, V, the U pin, the 7th ceramic disc capacitor C7, the 8th ceramic disc capacitor C8 and the 9th ceramic disc capacitor C9 are attempted by respectively the first electrochemical capacitor E1, the second electrochemical capacitor E2, the two ends of the 3rd electrochemical capacitor E3.
As an embodiment of the present utility model, three-phase current monitoring means 200 comprises the 7th resistance R 7, the 8th resistance R 8, the 9th resistance R 9; The first end of the first end of the first end of the 7th resistance R 7, the 8th resistance R 8, the 9th resistance R 9 is three inputs of three-phase current monitoring means 200, connect respectively three outputs of IPM driver element 100, the second end of the second end of the 7th resistance R 7, the 8th resistance R 8, the second end of the 9th resistance R 9 be ground connection all.
As an embodiment of the present utility model, filter unit 300 comprises the first ceramic disc capacitor C1, the second ceramic disc capacitor C2, the 3rd ceramic disc capacitor C3, the first resistance R 1, the second resistance R 2 and the 3rd resistance R 3; The first end of the first resistance R 1, the first end of the first end of the second resistance R 2 and the 3rd resistance R 3 connects respectively the second end of the 9th resistance R 9, the second end of the second end of the 8th resistance R 8 and the 7th resistance R 7, the second end of the first resistance R 1, the second end of the second end of the second resistance R 2 and the 3rd resistance R 3 is respectively the 3rd output of filter unit 300, the second output and the first output, the first ceramic disc capacitor C1 is connected between second end and ground of the first resistance R 1, the second ceramic disc capacitor C2 is connected between second end and ground of the second resistance R 2, and the 3rd ceramic disc capacitor C3 is connected between second end and ground of the 3rd resistance R 3.
As an embodiment of the present utility model, comparison judgment unit 400 comprises the first operational amplifier A D1, the second operational amplifier A D2, the 3rd operational amplifier A D3, four-operational amplifier AD4, the 4th resistance R 4, the 5th resistance R 5, the 6th resistance R 6, the tenth resistance R 10, the 11 resistance R 11, the 4th ceramic disc capacitor C4, the 5th ceramic disc capacitor C5 and the 6th ceramic disc capacitor C6; The inverting input of the first operational amplifier A D1, the inverting input of the second operational amplifier A D2, the inverting input of the 3rd operational amplifier A D3 connects respectively the first output of filter unit 300, the second output and the 3rd output, the 4th resistance R 4, the 5th resistance R 5, the 6th resistance R 6 is connected on successively+5V DC power supply and ground between, the 4th ceramic disc capacitor C4 is connected between the public connecting end and ground of the 4th resistance R 4 and the 5th resistance R 5, the 5th ceramic disc capacitor C5 is connected between the public connecting end and ground of the 5th resistance R 5 and the 6th resistance R 6, the normal phase input end of the first operational amplifier A D1, the normal phase input end of the second operational amplifier A D2, the normal phase input end of the 3rd operational amplifier A D3 connects the public connecting end of the 5th resistance R 5 and the 6th resistance R 6 simultaneously, the 6th ceramic disc capacitor C6 is connected between the power end and ground of the 3rd operational amplifier A D3, the output of the first operational amplifier A D1, the output of the second operational amplifier A D2, the output of the 3rd operational amplifier A D3 is connected to the inverting input of four-operational amplifier AD4 altogether, the tenth resistance R 10 is connected between the inverting input and ground of four-operational amplifier AD4, the normal phase input end of four-operational amplifier AD4 connects the public connecting end of the 4th resistance R 4 and the 5th resistance R 5, the FAULT pin of the output termination IPM module I C1 of four-operational amplifier AD4, the 11 resistance R 11 be connected on four-operational amplifier AD4 output and+the 5V DC power supply between.
As a preferred embodiment of the present utility model, the first operational amplifier A D1, the second operational amplifier A D2, the 3rd operational amplifier A D3, four-operational amplifier AD4 all select LM393, and its switch speed is faster, and the corresponding time is also shorter.
The below makes brief description to the operation principle of driven compressor current protecting circuit shown in Figure 2:
Master chip produces pulse signal and drives IPM module I C1, be STK621-033C-E, IPM module I C1 is by U, V, the running of W pin drive compression machine, wherein the first electrochemical capacitor E1 and the 7th ceramic disc capacitor C7, the second electrochemical capacitor E2 and the 8th ceramic disc capacitor C8, the 3rd electrochemical capacitor E3 and the 9th ceramic disc capacitor C9 compressor current signal of giving in parallel carries out filtering, the assurance little harmonic content of trying one's best reduces the plasticator running noise; The 7th resistance R 7 of three-phase current monitoring means 200, the 8th resistance R 8, the 9th resistance R 9 are carried out tracking sampling to three-phase current respectively, export the size of trigger protection voltage by the resistance of regulating these three resistance; Electric current after the sampling is through the first resistance R 1 and the first ceramic disc capacitor C1, the second resistance R 2 and the second ceramic disc capacitor C2, the RC filter that the 3rd resistance R 3 and the 3rd ceramic disc capacitor C3 form respectively, be to send into the first operational amplifier A D1 after filter unit 300 filtering, the second operational amplifier A D2, the inverting input of the 3rd operational amplifier A D3, the 4th resistance R 4, the 5th resistance R 5, the 6th resistance R 6 is respectively operational amplifier in the same way reference voltage (0.5V) is provided, the 4th capacitor C 4 wherein, the 5th capacitor C 5 and the 4th resistance R 4, the 5th resistance R 5, the 6th resistance R 6 consists of filter and further the operational amplifier reference signal is carried out filtering, reduces the possibility of erroneous judgement.The output of the first operational amplifier A D1, the second operational amplifier A D2, the 3rd operational amplifier A D3 is in parallel, output signal is sent into the inverting input of four-operational amplifier AD4, signal after relatively more reverse through four-operational amplifier AD4 is sent into the FAULT pin of IPM module I C1, makes IPM make corresponding actions.
During normal operation, the anti-phase input terminal voltage of the first operational amplifier A D1, the second operational amplifier A D2, the 3rd operational amplifier A D3 is less than normal phase input end voltage, export relatively afterwards high level through amplifier, through the FAULT pin of output low level after the four-operational amplifier AD4 to IPM module I C1, the protection input pin FAULT pin of IPM module I C1 does not have triggering signal again; Otherwise; if when detecting three-phase current any and have mutually overcurrent to occur; four-operational amplifier AD4 inverting input receives low level; oppositely give afterwards the protection pin FAULT pin output high level signal of IPM module I C1 through it; IPM module I C1 will make corresponding protection action, reaches the purpose of protection compressor and power device (IPM module, IGBT, MOSFET) etc.
The utility model embodiment also provides a kind of direct current varied-frequency air conditioner, and described air conditioner comprises the driven compressor current protecting circuit of aforesaid any form.
The utility model provides a kind of direct current varied-frequency air conditioner and driven compressor current protecting circuit, described circuit comprises IPM driver element, three-phase current monitoring means, filter unit and comparison judgment unit, wherein, the IPM driver element receives the control signal drive compression machine running of master chip output and deals with according to the current anomaly situation; Whether three-phase current monitoring means monitoring compressor three-phase current waveform is unusual; Filter unit links to each other with the three-phase current monitoring means, the current waveform signal that receives is carried out filtering process; Comparison judgment unit accept filter unit output current information and judge and process.Whole driven compressor current protecting circuit advantage is: fast response time, and response accuracy is high, and circuit is fairly simple, and the device that adopts is less, and cost is lower.
The above only is preferred embodiment of the present utility model, not in order to limit the utility model, although with reference to previous embodiment the utility model has been carried out more detailed explanation, for a person skilled in the art, it still can be made amendment or part technical characterictic wherein is equal to replacement the technical scheme that aforementioned each embodiment puts down in writing.All any modifications of within spirit of the present utility model and principle, doing, be equal to and replace and improvement etc., all should be included within the protection range of the present utility model.
Claims (8)
1. driven compressor current protecting circuit is joined with the master chip of direct current varied-frequency air conditioner, it is characterized in that described circuit comprises:
Link to each other with described master chip, receive the control signal drive compression machine running of described master chip output and the IPM driver element of dealing with according to the current anomaly situation;
Link to each other with the output of described IPM driver element, monitor whether unusual three-phase current monitoring means of described compressor three-phase current waveform;
Link to each other with described three-phase current monitoring means, the current waveform signal that receives is carried out the filter unit that filtering is processed; And
Be connected between described filter unit and the described IPM driver element, receive the current information of described filter unit output and the comparison judgment unit of judging and processing.
2. driven compressor current protecting circuit as claimed in claim 1, it is characterized in that described IPM driver element comprises IPM module I C1, the first electrochemical capacitor E1, the second electrochemical capacitor E2, the 3rd electrochemical capacitor E3, the 7th ceramic disc capacitor C7, the 8th ceramic disc capacitor C8 and the 9th ceramic disc capacitor C9;
The W+ of described IPM module I C1, U+, V+, W-, U-and V-pin join with described master chip respectively, the W of described IPM module I C1, V, the U pin is three outputs of described IPM driver element, link to each other with three inputs of described three-phase current monitoring means respectively, the FAULT pin of described IPM module I C1 connects the output of described comparison judgment unit, the positive pole of described the first electrochemical capacitor E1, the positive pole of the second electrochemical capacitor E2, the positive pole of the 3rd electrochemical capacitor E3 meets respectively the VB3 of described IPM module I C1, VB2, the VB1 pin, the negative pole of described the first electrochemical capacitor E1, the negative pole of the second electrochemical capacitor E2, the negative pole of the 3rd electrochemical capacitor E3 meets respectively the W of described IPM module I C1, V, the U pin, described the 7th ceramic disc capacitor C7, the 8th ceramic disc capacitor C8 and the 9th ceramic disc capacitor C9 are attempted by respectively described the first electrochemical capacitor E1, the second electrochemical capacitor E2, the two ends of the 3rd electrochemical capacitor E3.
3. driven compressor current protecting circuit as claimed in claim 2 is characterized in that, described IPM module I C1 is STK621-033C-E.
4. driven compressor current protecting circuit as claimed in claim 2 or claim 3 is characterized in that described three-phase current monitoring means comprises the 7th resistance R 7, the 8th resistance R 8, the 9th resistance R 9;
The first end of the first end of the first end of described the 7th resistance R 7, the 8th resistance R 8, the 9th resistance R 9 is three inputs of described three-phase current monitoring means, connect respectively three outputs of described IPM driver element, the second end of the second end of described the 7th resistance R 7, the 8th resistance R 8, the second end of the 9th resistance R 9 be ground connection all.
5. driven compressor current protecting circuit as claimed in claim 4 is characterized in that, described filter unit comprises the first ceramic disc capacitor C1, the second ceramic disc capacitor C2, the 3rd ceramic disc capacitor C3, the first resistance R 1, the second resistance R 2 and the 3rd resistance R 3;
The first end of described the first resistance R 1, the first end of the first end of the second resistance R 2 and the 3rd resistance R 3 connects respectively the second end of described the 9th resistance R 9, the second end of the second end of the 8th resistance R 8 and the 7th resistance R 7, the second end of described the first resistance R 1, the second end of the second end of the second resistance R 2 and the 3rd resistance R 3 is respectively the 3rd output of described filter unit, the second output and the first output, described the first ceramic disc capacitor C1 is connected between second end and ground of described the first resistance R 1, described the second ceramic disc capacitor C2 is connected between second end and ground of described the second resistance R 2, and described the 3rd ceramic disc capacitor C3 is connected between second end and ground of described the 3rd resistance R 3.
6. driven compressor current protecting circuit as claimed in claim 5, it is characterized in that described comparison judgment unit comprises the first operational amplifier A D1, the second operational amplifier A D2, the 3rd operational amplifier A D3, four-operational amplifier AD4, the 4th resistance R 4, the 5th resistance R 5, the 6th resistance R 6, the tenth resistance R 10, the 11 resistance R 11, the 4th ceramic disc capacitor C4, the 5th ceramic disc capacitor C5 and the 6th ceramic disc capacitor C6;
The inverting input of described the first operational amplifier A D1, the inverting input of the second operational amplifier A D2, the inverting input of the 3rd operational amplifier A D3 connects respectively the first output of described filter unit, the second output and the 3rd output, described the 4th resistance R 4, the 5th resistance R 5, the 6th resistance R 6 is connected between DC power supply and the ground successively, described the 4th ceramic disc capacitor C4 is attempted by between the public connecting end and ground of described the 4th resistance R 4 and the 5th resistance R 5, described the 5th ceramic disc capacitor C5 is attempted by between the public connecting end and ground of described the 5th resistance R 5 and the 6th resistance R 6, the normal phase input end of described the first operational amplifier A D1, the normal phase input end of the second operational amplifier A D2, the normal phase input end of the 3rd operational amplifier A D3 connects the public connecting end of described the 5th resistance R 5 and the 6th resistance R 6 simultaneously, described the 6th ceramic disc capacitor C6 is attempted by between the power end and ground of described the 3rd operational amplifier A D3, the output of described the first operational amplifier A D1, the output of the second operational amplifier A D2, the output of the 3rd operational amplifier A D3 is connected to the inverting input of described four-operational amplifier AD4 altogether, described the tenth resistance R 10 is connected between the inverting input and ground of described four-operational amplifier AD4, the normal phase input end of described four-operational amplifier AD4 connects the public connecting end of described the 4th resistance R 4 and the 5th resistance R 5, the FAULT pin of the described IPM module I of the output termination C1 of described four-operational amplifier AD4, described the 11 resistance R 11 is connected between the output and DC power supply of described four-operational amplifier AD4.
7. driven compressor current protecting circuit as claimed in claim 6 is characterized in that, described the first operational amplifier A D1, the second operational amplifier A D2, the 3rd operational amplifier A D3, four-operational amplifier AD4 are LM393.
8. a direct current varied-frequency air conditioner is characterized in that, described air conditioner comprises each described driven compressor current protecting circuit such as claim 1-7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012204168281U CN202797890U (en) | 2012-08-21 | 2012-08-21 | Direct current inverter air conditioner and compressor driving current protection circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012204168281U CN202797890U (en) | 2012-08-21 | 2012-08-21 | Direct current inverter air conditioner and compressor driving current protection circuit |
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| CN202797890U true CN202797890U (en) | 2013-03-13 |
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| CN2012204168281U Expired - Lifetime CN202797890U (en) | 2012-08-21 | 2012-08-21 | Direct current inverter air conditioner and compressor driving current protection circuit |
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Cited By (3)
| 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 |
| CN108107293A (en) * | 2017-12-21 | 2018-06-01 | 珠海科骏科技有限公司 | A kind of method and system of convertible frequency air-conditioner functional test |
| CN114019349A (en) * | 2021-10-20 | 2022-02-08 | 海信（山东）冰箱有限公司 | Hardware detection method and circuit of frequency conversion board |
-
2012
- 2012-08-21 CN CN2012204168281U patent/CN202797890U/en not_active Expired - Lifetime
Cited By (5)
| 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 |
| US9780555B2 (en) | 2014-04-02 | 2017-10-03 | Midea Group Co., Ltd. | Air conditioner and compressor protection circuit thereof |
| CN108107293A (en) * | 2017-12-21 | 2018-06-01 | 珠海科骏科技有限公司 | A kind of method and system of convertible frequency air-conditioner functional test |
| CN108107293B (en) * | 2017-12-21 | 2020-02-07 | 珠海科骏科技有限公司 | Method and system for testing functions of variable frequency air conditioner |
| CN114019349A (en) * | 2021-10-20 | 2022-02-08 | 海信（山东）冰箱有限公司 | Hardware detection method and circuit of frequency conversion board |
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Granted publication date: 20130313 |