CN203722530U - Variable frequency air conditioner, air condition compressor controller and current sampling circuit thereof - Google Patents
Variable frequency air conditioner, air condition compressor controller and current sampling circuit thereof Download PDFInfo
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- CN203722530U CN203722530U CN201420007573.2U CN201420007573U CN203722530U CN 203722530 U CN203722530 U CN 203722530U CN 201420007573 U CN201420007573 U CN 201420007573U CN 203722530 U CN203722530 U CN 203722530U
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- 238000005070 sampling Methods 0.000 title claims abstract description 77
- 238000001914 filtration Methods 0.000 claims abstract description 59
- 239000003990 capacitor Substances 0.000 claims description 35
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Abstract
The utility model belongs to the technical field of current sampling, and provides a variable frequency air conditioner, an air condition compressor controller and a current sampling circuit thereof. The current sampling circuit comprising a difference filtering module, a difference operation amplifier module and a filtering module is adopted in the air condition compressor controller, wherein difference filtering processing is performed on a current sampling signal and a power ground electrical level fluctuation signal by the difference filtering module, difference operational amplification processing is performed on the current sampling signal and the power ground electrical level fluctuation signal which are processed by the difference filtering module by the difference operation amplifier module, a current sampling output signal is then generated by the difference filtering module, and a current sampling feedback signal is output to a main control chip after the filtering module performs high-frequency noise filtering on the current sampling output signal, such that the current sampling feedback signal does not contain the power ground electrical level fluctuation signal, thus output disturbance of the power ground electrical level fluctuation signal on the current sampling circuit is removed, and the current sampling accuracy is raised.
Description
Technical field
The utility model belongs to current sample technical field, relates in particular to a kind of convertible frequency air-conditioner, air conditioner compressed machine controller and current sampling circuit thereof.
Background technology
At present, when the frequency converting air-conditioner compressor that adopts permagnetic synchronous motor to drive is carried out to vector control, the three-phase current information that obtains real-time and accurately compressor is that can compressor stable operation and the accurate key of speed governing.From cost-saving angle, in the prior art, it is generally to adopt resistance sampling method that the compressor controller of convertible frequency air-conditioner carries out current detecting to compressor, by being connected in the sampling resistor of brachium pontis under the power model of compressor, carries out current sample.In order to reduce loss, the resistance of sampling resistor is very little (as 15 to 20 milliohms) conventionally, thereby it is also very little to convert the amplitude of voltage signal of reflection compressor current information to.Theoretically, the level in analog and between the Power Groud of compressor controller of current sampling circuit should be suitable, but in actual mechanical process, impact due to factors such as the wiring of compressor controller and compressor current commutations, above-mentioned Power Groud (being the forceful electric power ground of compressor controller) and above-mentioned understanding and produce level fluctuation between (being the light current ground of current sampling circuit) in analog, make current sampling circuit introduce voltage disturbance from the power model of compressor, thereby cause compressor current sampling inaccurate, and then cause compressor rotary speed to fluctuate, and produce vibrating noise, when serious, also can make the compressor can not stable operation.
Utility model content
The purpose of this utility model is to provide a kind of current sampling circuit of air conditioner compressed machine controller, be intended to solve in the driving process of compressor of air conditioner, because of the Power Groud of compressor controller and current sampling circuit in analog between exist level fluctuation to cause the inaccurate problem of current sample.
The utility model is to realize like this, a kind of current sampling circuit of air conditioner compressed machine controller, comprise sampling resistor, described sampling resistor is connected between the lower brachium pontis switching tube and Power Groud in the power model of compressor of air conditioner, and carries out current sample to produce corresponding current sampling signal; Described Power Groud is with respect to the Power Groud of the generation in analog level fluctuation signal of described current sampling circuit; Described current sampling circuit also comprises:
Sampled signal input and fluctuation signal input are connected respectively first end and second end of described sampling resistor, by described current sampling signal and described Power Groud level fluctuation signal carry out differential filtering process after the differential filtering module of output;
Sampled signal input and fluctuation signal input are connected respectively sampled signal output and the fluctuation signal output of described differential filtering module, the current sampling signal after described differential filtering resume module and Power Groud level fluctuation signal are carried out to calculus of differences and amplify the difference amplifier module of processing and generate current sample output signal;
Input connects the output of described difference amplifier module, output connects the main control chip of air conditioner compressed machine controller, described current sample output signal is carried out to high-frequency noise filtering and process rear output current sampled feedback signal to the filtration module of described main control chip.
Another object of the present utility model is also to provide a kind of air conditioner compressed machine controller, and it comprises power model and main control chip, and described main control chip is controlled described power model and driven compressor of air conditioner work; Described air conditioner compressed machine controller also comprises above-mentioned current sampling circuit.
Another object of the present utility model is also to provide a kind of convertible frequency air-conditioner, and it comprises compressor and above-mentioned air conditioner compressed machine controller.
The utility model by adopting and comprise differential filtering module in air conditioner compressed machine controller, the current sampling circuit of difference amplifier module and filtration module, by differential filtering module, current sampling signal and Power Groud level fluctuation signal are carried out to differential filtering processing, difference amplifier module is carried out calculus of differences to the current sampling signal after differential filtering resume module and Power Groud level fluctuation signal and is amplified and process and generate current sample output signal, finally by crossing filtration module, this current sample output signal is carried out to the rear output current sampled feedback signal of high-frequency noise filtering processing to main control chip, in current sample feedback signal, no longer comprise power low level fluctuation signal, thereby having eliminated Power Groud level fluctuation signal disturbs the output of current sampling circuit, improved current sample precision, solved in the driving process of compressor of air conditioner, because of the Power Groud of compressor controller and current sampling circuit in analog between exist level fluctuation to cause the inaccurate problem of current sample.
Accompanying drawing explanation
Fig. 1 is the structure chart of the air conditioner compressed machine controller that provides of the utility model embodiment;
Fig. 2 is the modular structure figure of the current sampling circuit of the air conditioner compressed machine controller that provides of the utility model embodiment;
Fig. 3 is the exemplary circuit structure chart of the current sampling circuit of the air conditioner compressed machine controller 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.
The utility model embodiment provides a kind of convertible frequency air-conditioner, and it comprises compressor and air conditioner compressed machine controller.
Above-mentioned air conditioner compressed machine controller comprises power model 200 and main control chip 300, and as shown in Figure 1, these main control chip 300 power ratio control modules 200 drive compressor of air conditioner 400 work.In addition, air conditioner compressed machine controller also comprises a current sampling circuit 100, and Fig. 2 shows the modular structure of this current sampling circuit 100, for convenience of explanation, only shows the part relevant to the utility model embodiment, and details are as follows:
Current sampling circuit 100 comprises sampling resistor R, and sampling resistor R is connected between the lower brachium pontis switching tube and Power Groud in power model 200, and carries out current sample to produce corresponding current sampling signal Uin; Power Groud can produce Power Groud level fluctuation signal Udis in analog with respect to current sampling circuit.Power model 200 comprises three upper brachium pontis switching tubes (Q1, Q3, Q5) and three lower brachium pontis switching tubes (Q2, Q4, Q6), it is for exporting three-phase electricity to drive compressor of air conditioner to carry out work, as shown in Figure 1, between the source electrode of each lower brachium pontis switching tube and Power Groud, be all in series with a sampling resistor R to carry out current sample.
Current sampling circuit 100 also comprises:
Sampled signal input and fluctuation signal input are connected respectively first end and the second end of sampling resistor R, by above-mentioned current sampling signal Uin and Power Groud level fluctuation signal Udis carry out differential filtering process after the differential filtering module 101 of output;
Sampled signal input and fluctuation signal input are connected respectively sampled signal output and the fluctuation signal output of differential filtering module 101, the current sampling signal after differential filtering module 101 is processed and Power Groud level fluctuation signal are carried out to calculus of differences and amplify the difference amplifier module 102 of processing and generate current sample output signal;
Input connects the output of difference amplifier module 102, and output connects main control chip 300, above-mentioned current sample output signal is carried out to high-frequency noise filtering and process rear output current sampled feedback signal Uout to the filtration module 103 of main control chip 300.
Fig. 3 shows the exemplary circuit structure of the current sampling circuit that the utility model embodiment provides, and for convenience of explanation, only shows the part relevant to the utility model embodiment, and details are as follows:
As the utility model one embodiment, differential filtering module 101 comprises:
The first resistance R 1, the first capacitor C 1, the second capacitor C 2, the 3rd capacitor C 3, the 4th capacitor C 4 and the second resistance R 2;
The common contact of the first end of the first end of the first resistance R 1 and the first capacitor C 1 is the sampled signal input of differential filtering module 101, the common contact of the second end of the first resistance R 1 and the first end of the 3rd capacitor C 3 is the sampled signal output of differential filtering module 101, the second end of the first capacitor C 1 and the first end of the second capacitor C 2, the second end of the 3rd capacitor C 3 and the first end of the 4th capacitor C 4 are connected in analog altogether, the common contact of the second end of the second capacitor C 2 and the first end of the second resistance R 2 is the fluctuation signal input of differential filtering module 101, the common contact of the second end of the second end of the second resistance R 2 and the 4th capacitor C 4 is the fluctuation signal output of differential filtering module 101.
As the utility model one embodiment, difference amplifier module 102 comprises:
The 3rd resistance R 3, operational amplifier U1 and the 4th resistance R 4;
The first end of the 3rd resistance R 3 connects bias reference voltage source VREF, the common contact of the second end of the 3rd resistance R 3 and the in-phase input end of operational amplifier U1 is the sampled signal input of difference amplifier module 102, the common contact of the first end of the inverting input of operational amplifier U1 and the 4th resistance R 4 is the fluctuation signal input of difference amplifier module 102, and the common contact of the second end of the output of operational amplifier U1 and the 4th resistance R 4 is the output of difference amplifier module 102.
As the utility model one embodiment, filtration module 103 comprises the 5th resistance R 5 and the 5th capacitor C 5; The first end of the 5th resistance R 5 is the input of filtration module 103, and the common contact of the second end of the 5th resistance R 5 and the first end of the 5th capacitor C 5 is the output of filtration module 103, the second end connecting analog ground of the 5th capacitor C 5.
Below in conjunction with operation principle, above-mentioned current sampling circuit 100 is described further:
First, by the first resistance R 1, the first capacitor C 1, the second capacitor C 2, the 3rd capacitor C 3, the differential filtering circuit that the 4th capacitor C 4 and the second resistance R 2 form carries out differential filtering processing to current sampling signal Uin and Power Groud level fluctuation signal Udis, pass through by the 3rd resistance R 3 again, the difference operational amplifying circuit that operational amplifier U1 and the 4th resistance R 4 form carries out calculus of differences and amplifies processing output current sampled output signal, finally after the 5th resistance R 5 and the 5th capacitor C 5 form RC filter circuit the high-frequency noise in current sample output signal are carried out to filtering output current sampled feedback signal Uout to main control chip 300.
Suppose that the resistance of the first resistance R 1 and the second resistance R 2 is identical and be Ra, the resistance of the 3rd resistance R 3 and the 4th resistance R 4 is identical and be Rb, Rb=5Ra, the voltage U ref of bias reference voltage source VREF is 2.5V, the voltage of the in-phase input end of operational amplifier U1 is Un, has following relational expression:
According to relational expression (1) and (2), Rb=5Ra and Uref=2.5V, can obtain:
Uout=2.5+5·Uin （3）
As seen from formula (3), current sample feedback signal Uout has not comprised Power Groud level fluctuation signal Udis, therefore, the current sampling circuit 100 that the utility model embodiment provides can be eliminated the interference that Power Groud level fluctuation causes the output of current sampling circuit 100 effectively, improve current sample precision, be conducive to promote the control precision of compressor of air conditioner, the stability that increases system and reduction compressor operating noise.
In addition, in carrying out PCB routing process, the sampled signal input of current sampling circuit 100 and the line of fluctuation signal input respectively and between sampling resistor R and Power Groud should be short as far as possible, can adopt if desired wire jumper to connect to guarantee that line stray inductance is minimum, thereby can avoid producing extra noise jamming.
The utility model embodiment by adopting and comprise differential filtering module 101 in air conditioner compressed machine controller, the current sampling circuit 100 of difference amplifier module 102 and filtration module 103, by differential filtering module 101, current sampling signal Uin and Power Groud level fluctuation signal Udis are carried out to differential filtering processing, current sampling signal after differential filtering module 101 is processed of 102 pairs of difference amplifier modules and Power Groud level fluctuation signal carry out calculus of differences and amplify and process and generate current sample output signal, finally by crossing 103 pairs of these current sample output signals of filtration module, carry out the rear output current sampled feedback signal Uout of high-frequency noise filtering processing to main control chip 300, in current sample feedback signal Uout, no longer comprise power low level fluctuation signal, thereby having eliminated Power Groud level fluctuation signal Udis disturbs the output of current sampling circuit 100, improved current sample precision, solved in the driving process of compressor of air conditioner, because of the Power Groud of compressor controller and current sampling circuit in analog between exist level fluctuation to cause the inaccurate problem of current sample.
The foregoing is only preferred embodiment of the present utility model; not in order to limit the utility model; 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 (6)
1. a current sampling circuit for air conditioner compressed machine controller, comprises sampling resistor, and described sampling resistor is connected between the lower brachium pontis switching tube and Power Groud in the power model of compressor of air conditioner, and carries out current sample to produce corresponding current sampling signal; Described Power Groud is with respect to the Power Groud of the generation in analog level fluctuation signal of described current sampling circuit; It is characterized in that, described current sampling circuit also comprises:
Sampled signal input and fluctuation signal input are connected respectively first end and second end of described sampling resistor, by described current sampling signal and described Power Groud level fluctuation signal carry out differential filtering process after the differential filtering module of output;
Sampled signal input and fluctuation signal input are connected respectively sampled signal output and the fluctuation signal output of described differential filtering module, the current sampling signal after described differential filtering resume module and Power Groud level fluctuation signal are carried out to calculus of differences and amplify the difference amplifier module of processing and generate current sample output signal;
Input connects the output of described difference amplifier module, output connects the main control chip of air conditioner compressed machine controller, described current sample output signal is carried out to high-frequency noise filtering and process rear output current sampled feedback signal to the filtration module of described main control chip.
2. current sampling circuit as claimed in claim 1, is characterized in that, described differential filtering module comprises:
The first resistance R 1, the first capacitor C 1, the second capacitor C 2, the 3rd capacitor C 3, the 4th capacitor C 4 and the second resistance R 2;
The common contact of the first end of the first end of described the first resistance R 1 and described the first capacitor C 1 is the sampled signal input of described differential filtering module, the common contact of the second end of described the first resistance R 1 and the first end of described the 3rd capacitor C 3 is the sampled signal output of described differential filtering module, the second end of described the first capacitor C 1 and the first end of described the second capacitor C 2, the second end of described the 3rd capacitor C 3 and the first end of described the 4th capacitor C 4 are connected in analog altogether, the common contact of the second end of described the second capacitor C 2 and the first end of described the second resistance R 2 is the fluctuation signal input of described differential filtering module, the common contact of the second end of the second end of described the second resistance R 2 and described the 4th capacitor C 4 is the fluctuation signal output of described differential filtering module.
3. current sampling circuit as claimed in claim 1, is characterized in that, described difference amplifier module comprises:
The 3rd resistance R 3, operational amplifier and the 4th resistance R 4;
The first end of described the 3rd resistance R 3 connects bias reference voltage source, the common contact of the second end of described the 3rd resistance R 3 and the in-phase input end of described operational amplifier is the sampled signal input of described difference amplifier module, the common contact of the first end of the inverting input of described operational amplifier and described the 4th resistance R 4 is the fluctuation signal input of described difference amplifier module, and the common contact of the second end of the output of described operational amplifier and described the 4th resistance R 4 is the output of described difference amplifier module.
4. current sampling circuit as claimed in claim 1, is characterized in that, described filtration module comprises the 5th resistance R 5 and the 5th capacitor C 5; The first end of described the 5th resistance R 5 is the input of described filtration module, the output that the common contact of the second end of described the 5th resistance R 5 and the first end of described the 5th capacitor C 5 is described filtration module, the second end connecting analog ground of described the 5th capacitor C 5.
5. an air conditioner compressed machine controller, comprises power model and main control chip, and described main control chip is controlled described power model and driven compressor of air conditioner work; It is characterized in that, described air conditioner compressed machine controller also comprises the current sampling circuit as described in claim 1 to 4 any one.
6. a convertible frequency air-conditioner, comprises compressor, it is characterized in that, described convertible frequency air-conditioner also comprises air conditioner compressed machine controller as claimed in claim 5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420007573.2U CN203722530U (en) | 2014-01-06 | 2014-01-06 | Variable frequency air conditioner, air condition compressor controller and current sampling circuit thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420007573.2U CN203722530U (en) | 2014-01-06 | 2014-01-06 | Variable frequency air conditioner, air condition compressor controller and current sampling circuit thereof |
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| CN203722530U true CN203722530U (en) | 2014-07-16 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104485632A (en) * | 2014-11-21 | 2015-04-01 | 成都嵌智捷科技有限公司 | Current sampling circuit based on embedded field |
| CN105406790A (en) * | 2015-12-25 | 2016-03-16 | 上海交通大学 | Frequency converter three-resistance current sampling method based on current prediction |
| CN105515472A (en) * | 2016-01-25 | 2016-04-20 | 无锡凌鸥微电子有限公司 | Motor drive current detection circuit and control system |
| CN107589293A (en) * | 2017-09-11 | 2018-01-16 | 珠海格力节能环保制冷技术研究中心有限公司 | A kind of current sampling circuit |
| CN113422557A (en) * | 2021-06-29 | 2021-09-21 | 四川航天烽火伺服控制技术有限公司 | Motor control circuit and electric steering engine system |
-
2014
- 2014-01-06 CN CN201420007573.2U patent/CN203722530U/en not_active Expired - Lifetime
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104485632A (en) * | 2014-11-21 | 2015-04-01 | 成都嵌智捷科技有限公司 | Current sampling circuit based on embedded field |
| CN105406790A (en) * | 2015-12-25 | 2016-03-16 | 上海交通大学 | Frequency converter three-resistance current sampling method based on current prediction |
| CN105406790B (en) * | 2015-12-25 | 2018-08-31 | 上海交通大学 | The three resistor current method of sampling of frequency converter based on current forecasting |
| CN105515472A (en) * | 2016-01-25 | 2016-04-20 | 无锡凌鸥微电子有限公司 | Motor drive current detection circuit and control system |
| CN105515472B (en) * | 2016-01-25 | 2018-05-25 | 南京凌鸥创芯电子有限公司 | Motor drive current detection circuit and control system |
| CN107589293A (en) * | 2017-09-11 | 2018-01-16 | 珠海格力节能环保制冷技术研究中心有限公司 | A kind of current sampling circuit |
| CN113422557A (en) * | 2021-06-29 | 2021-09-21 | 四川航天烽火伺服控制技术有限公司 | Motor control circuit and electric steering engine system |
| WO2023273130A1 (en) * | 2021-06-29 | 2023-01-05 | 四川航天烽火伺服控制技术有限公司 | Electric motor control circuit and electric steering engine system |
| CN113422557B (en) * | 2021-06-29 | 2023-09-29 | 四川航天烽火伺服控制技术有限公司 | Motor control circuit and electric steering engine system |
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Effective date of registration: 20160623 Address after: Beijiao town Shunde District Guangdong city Foshan province 528311 Shun Jiang neighborhood park four Xinye Road No. 8 B district (work place only for office purposes) Patentee after: FOSHAN SHUNDE MIDEA ELECTRONIC TECHNOLOGY Co.,Ltd. Address before: 528311 Beijiao City, Guangdong Province, Shunde Town, Lin Gang Road, Foshan Patentee before: GD MIDEA AIR-CONDITIONING EQUIPMENT Co.,Ltd. |
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| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20140716 |