CN205450098U - Current transformer module - Google Patents
Current transformer module Download PDFInfo
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- CN205450098U CN205450098U CN201521128112.1U CN201521128112U CN205450098U CN 205450098 U CN205450098 U CN 205450098U CN 201521128112 U CN201521128112 U CN 201521128112U CN 205450098 U CN205450098 U CN 205450098U
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Abstract
The utility model discloses a current transformer module includes first resistance, second resistance, third resistance, fourth resistance, first electric capacity, second electric capacity, first diode and transformer, the first output of transformer passes through the second output of fourth ohmic connection to transformer, the first output of transformer is connected to the positive terminal of first diode, the negative pole end of first diode passes through the positive terminal of third ohmic connection to second electric capacity, the positive terminal of second electric capacity passes through the second output of second ohmic connection to transformer, the positive terminal of second electric capacity is through first ohmic connection to output port. The utility model discloses can be through being connected with compressor and controller to the operating current of real -time detection compressor turns into voltage and transmits to the controller, makes things convenient for the calculation of compressor operating current, and can effectively improve and detect the precision, reduces the error. The utility model discloses but the wide application is in the compressor protection.
Description
Technical field
This utility model relates to electronic circuit technology field, particularly relates to a kind of current transformer module.
Background technology
Compressor is even more important as the core component of heat pump, the protection to it；And traditional compressor protection usually uses high-low pressure protection switch; its control method is for when system pressure reaches high-low pressure protection value; just disconnect high-low pressure protection switch; stop compressor operating protecting; the most so control method there is a problem in that: due to the highest by the accuracy of detection of high-low pressure protection switch; and error is big, does not often reach good protected effect.
Utility model content
In order to solve above-mentioned technical problem, the purpose of this utility model is to provide a kind of simple in construction, facilitates a kind of current transformer module of accurate calculating current.
Technical solution adopted in the utility model is:
A kind of current transformer module, including the first resistance, second resistance, 3rd resistance, 4th resistance, first electric capacity, second electric capacity, first diode and transformator, first outfan of described transformator is connected to the second outfan of transformator by the 4th resistance, first outfan of described transformator is connected to the positive terminal of the first diode, the negative pole end of described first diode is connected to the positive terminal of the second electric capacity by the 3rd resistance, the positive terminal of described second electric capacity is connected to the second outfan of transformator by the second resistance, the positive terminal of described second electric capacity is connected to output port by the first resistance, described output port is connected to the second outfan of transformator by the first electric capacity, the negative pole end of described second electric capacity is connected to the second outfan of transformator.
As the further improvement of described a kind of current transformer module, also including the second diode, the positive terminal of described second electric capacity is connected to the positive terminal of the second diode, and the negative pole end of described second diode is connected to protect voltage end.
As the further improvement of described a kind of current transformer module, described second electric capacity is electrochemical capacitor.
As the further improvement of described a kind of current transformer module, described output port is connected to controller.
As the further improvement of described a kind of current transformer module, any one phase that the input of described transformator is connected in three-phase compressor.
The beneficial effects of the utility model are:
This utility model one current transformer module simple in construction, can by being connected with compressor and controller, thus detect in real time compressor operating current and be converted into voltage transmit to controller, facilitate the calculating of compressor operating electric current, and accuracy of detection can be effectively improved, reduce error.
Accompanying drawing explanation
Below in conjunction with the accompanying drawings detailed description of the invention of the present utility model is described further:
Fig. 1 is the circuit theory diagrams of a kind of current transformer module of this utility model.
Detailed description of the invention
nullWith reference to Fig. 1，This utility model one current transformer module，Including the first resistance R1、Second resistance R2、3rd resistance R3、4th resistance R4、First electric capacity C1、Second electric capacity C2、First diode D1 and transformator CT，First outfan of described transformator CT is connected to second outfan of transformator CT by the 4th resistance R4，First outfan of described transformator CT is connected to the positive terminal of the first diode D1，The negative pole end of described first diode D1 is connected to the positive terminal of the second electric capacity C2 by the 3rd resistance R3，The positive terminal of described second electric capacity C2 is connected to second outfan of transformator CT by the second resistance R2，The positive terminal of described second electric capacity C2 is connected to output port by the first resistance R1，Described output port is connected to second outfan of transformator CT by the first electric capacity C1，The negative pole end of described second electric capacity C2 is connected to second outfan of transformator CT，Second outfan of described transformator CT is connected to ground.
Being further used as preferred embodiment, also include that the positive terminal of the second diode D2, described second electric capacity C2 is connected to the positive terminal of the second diode D2, the negative pole end of described second diode D2 is connected to protect voltage end.Second diode D2 is for guaranteeing that the analog quantity exporting chip mouth is not more than 5V, in order to avoid damaging chip.
Being further used as preferred embodiment, described second electric capacity C2 is electrochemical capacitor.
Being further used as preferred embodiment, described output port is connected to controller.
It is further used as preferred embodiment, any one phase that the input of described transformator CT is connected in three-phase compressor.
In this utility model, described transformator CTCT changes into the small area analysis (exchange) of sampling for the alternating current that would be required to detection；4th resistance R4R4 small area analysis after converting changes into voltage (exchange)；First diode D1D1 alternating voltage halfwave rectifier after converting becomes DC voltage；Second electric capacity C2C2 is used for smoothing DC voltage waveform after rectification, is input to chip after dividing potential drop；Described second resistance R2R2 and the 3rd resistance R3R3 is used as divider resistance, is mainly used in adjusting the parameter of A/D conversion, directly determines the A/D parameter being input to chip mouth；First resistance R1R1 and the first electric capacity C1C1 is used for constituting RC filter circuit.Owing to the A/D mouth required input electric current of controller is minimum, it is added in here between chip and input quantity, pressure drop will not be produced, thus without the accuracy of impact sampling.But the output signal of current detection circuit is filtered, is prevented High-frequency Interference.
A kind of compressor protection control method utilizing described module, comprises the following steps:
A, current transformer module being connected with compressor, the current signal of described compressor is converted into voltage signal by current transformer module and exports to controller；
B, described controller, according to the voltage signal collected, calculate working current value；
C, the current signal exporting compressor detect, and obtain actual current detected value；
D, according to working current value and actual current detected value, both are calibrated, obtain real work current value；
E, judge that real work current value whether more than the protective current value preset, the most then controls compressor and carries out stoppage protection；Otherwise, then current duty is maintained.
It is further used as preferred embodiment, also including:
F, when compressor is in stopped status, it is judged that real work current value whether less than the starting current value preset, the most then controls compressor start work；Otherwise, then current stopped status is maintained.
Being further used as preferred embodiment, in described step B, the computing formula of working current value is:
；
Wherein, I represents the resistance value that working current value, R2 represent the second resistance R2, and R3 represents the resistance value of the 3rd resistance R3, and R4 represents the resistance value of the 4th resistance R4, and Vout represents the voltage signal of collection, input and the turn ratio of outfan in N indication transformer CT.
Being further used as preferred embodiment, described step D includes:
D1, judge the difference of working current value and actual current detected value whether in default range of error, the most then using working current value as real work current value；Otherwise, then step D2 is performed；
The electric current of compressor is detected by D2, employing high-precision current table again, draws real work current value.
In this utility model specific embodiment, described current transformer module accuracy of detection is 0.1A, detection range 0 ~ 25A.
Sensed current I(compressor machine operating current in this utility model) and output to the electric current Iout, direct proportionality: I=N*Iout in circuit above；N is exactly input and the turn ratio of output, and for constant, different current transformers, N also has difference.
Alternating current Iout flows into circuit, by obtaining current effective value after the first diode D1 halfwave rectifier, is ultimately converted to voltage Vout and exports controller；Described first resistance R1, the first electric capacity C1 and the second electric capacity C2 form filter circuit, it is therefore an objective to make the direct current signal being input to control more smooth, prevent High-frequency Interference；Described second diode D2 is in order to ensure being input to the voltage signal of controller less than 5V, it is ensured that control chip is not damaged by.
A point voltage UA=Iout*R4 over the ground, owing to the 4th resistance R4 and the first diode D1, the 3rd resistance R3, the second resistance R2 are parallel relationship, then UB=UC* [R4/ (R4+R5)].
C point voltage UC=can be drawn according to diode halfwave rectifier* UA-0.5, wherein 0.5 is the pressure drop at diode two ends.
Comprehensive above formula draws operating current。
Controller collects Vout voltage signal, operating current is calculated again by formula, but owing in circuit, resistance (precision is 1%) exists certain error, can cause calculate go out incoming current and there is certain deviation in actual current, when the difference of working current value with actual current detected value exceeds the range of error preset, in order to make measurement result the most accurate, need to be with the ammeter (precision 0.01A) of higher precision, it is calibrated, formula is compensated process, obtains compressor operating electric current accurately.
From the foregoing it can be that
This utility model one current transformer module can be by being connected with compressor and controller, thus detect the operating current of compressor in real time and be converted into voltage transmission to controller, facilitate the calculating of compressor operating electric current, and accuracy of detection can be effectively improved, reduce error.
It is above preferable enforcement of the present utility model is illustrated, but this utility model is created and is not limited to described embodiment, those of ordinary skill in the art also can make all equivalent variations or replacement on the premise of this utility model spirit, and deformation or the replacement of these equivalents are all contained in the application claim limited range.
Claims (5)
1. a current transformer module, it is characterized in that: include the first resistance, second resistance, 3rd resistance, 4th resistance, first electric capacity, second electric capacity, first diode and transformator, first outfan of described transformator is connected to the second outfan of transformator by the 4th resistance, first outfan of described transformator is connected to the positive terminal of the first diode, the negative pole end of described first diode is connected to the positive terminal of the second electric capacity by the 3rd resistance, the positive terminal of described second electric capacity is connected to the second outfan of transformator by the second resistance, the positive terminal of described second electric capacity is connected to output port by the first resistance, described output port is connected to the second outfan of transformator by the first electric capacity, the negative pole end of described second electric capacity is connected to the second outfan of transformator.
A kind of current transformer module the most according to claim 1, it is characterised in that: also including the second diode, the positive terminal of described second electric capacity is connected to the positive terminal of the second diode, and the negative pole end of described second diode is connected to protect voltage end.
A kind of current transformer module the most according to claim 2, it is characterised in that: described second electric capacity is electrochemical capacitor.
A kind of current transformer module the most according to claim 3, it is characterised in that: described output port is connected to controller.
A kind of current transformer module the most according to claim 4, it is characterised in that: any one phase that the input of described transformator is connected in three-phase compressor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521128112.1U CN205450098U (en) | 2015-12-28 | 2015-12-28 | Current transformer module |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521128112.1U CN205450098U (en) | 2015-12-28 | 2015-12-28 | Current transformer module |
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| Publication Number | Publication Date |
|---|---|
| CN205450098U true CN205450098U (en) | 2016-08-10 |
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| CN201521128112.1U Active CN205450098U (en) | 2015-12-28 | 2015-12-28 | Current transformer module |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105510696A (en) * | 2015-12-28 | 2016-04-20 | 广东芬尼克兹节能设备有限公司 | Current transformer module and compressor protection control method using same |
| CN111322233A (en) * | 2020-02-28 | 2020-06-23 | 珠海格力电器股份有限公司 | Sampling circuit and method for improving precision, compressor and air conditioning equipment |
| CN111656469A (en) * | 2018-02-15 | 2020-09-11 | Abb电网瑞士股份公司 | Insulation of non-liquid immersed transformer |
-
2015
- 2015-12-28 CN CN201521128112.1U patent/CN205450098U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105510696A (en) * | 2015-12-28 | 2016-04-20 | 广东芬尼克兹节能设备有限公司 | Current transformer module and compressor protection control method using same |
| CN111656469A (en) * | 2018-02-15 | 2020-09-11 | Abb电网瑞士股份公司 | Insulation of non-liquid immersed transformer |
| CN111656469B (en) * | 2018-02-15 | 2022-03-25 | 日立能源瑞士股份公司 | Insulation of non-liquid immersed transformer |
| US11335498B2 (en) | 2018-02-15 | 2022-05-17 | Hitachi Energy Switzerland Ag | Insulation of non-liquid immersed transformers |
| CN111322233A (en) * | 2020-02-28 | 2020-06-23 | 珠海格力电器股份有限公司 | Sampling circuit and method for improving precision, compressor and air conditioning equipment |
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