CN202204866U - Current detection circuit for air-conditioner compressor - Google Patents
Current detection circuit for air-conditioner compressor Download PDFInfo
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- CN202204866U CN202204866U CN2011203183735U CN201120318373U CN202204866U CN 202204866 U CN202204866 U CN 202204866U CN 2011203183735 U CN2011203183735 U CN 2011203183735U CN 201120318373 U CN201120318373 U CN 201120318373U CN 202204866 U CN202204866 U CN 202204866U
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- current detection
- detection circuit
- compressor
- air conditioner
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Abstract
The utility model relates to a current detection circuit for an air-conditioner compressor. The current detection circuit for the air-conditioner compressor comprises a current detection unit and a processing unit; the current detection unit comprises three current detection modules for detecting three phase current of the air-conditioner compressor respectively; the current detection module comprises a current transformer, an analog resistor, a commutation diode, an electrolytic capacitor, a first shunt resistor and a second shunt resistor, the current transformer is connected to one phase current input of the three phase current of the air-conditioner compressor; the analog resistor is connected with the current transformer in parallel; the positive pole of the commutation diode is connected with the output end of the current transformer; the first shunt resistor is connected with the negative pole of the commutation diode, and the other end of the first shunt resistor is connected with the second shunt resistor; the other end of the second shunt resistor is connected with the analog resistor and then connected with the positive pole of the commutation diode; the electrolytic capacitor is connected with the second shunt resistor in parallel; and one end of the electrolytic capacitor is connected with the processing unit, and the other end is connected to the ground. The three current detection modules detect the three phase current respectively, and through the detection of the three phase current of an air-conditioner, measures can be taken to protect the air-conditioner effectively when the unbalance of the three phase current is detected.
Description
Technical field
The utility model relates to a kind of compressor of air conditioner current detection circuit, relates in particular to a kind of current detection circuit that detects the compressor of air conditioner three-phase current.
Background technology
Along with the development of air-conditioning technical, to air-conditioning with use and protect more and more important.It promptly is one of measure of protection air-conditioning that compressor of air conditioner is carried out current detecting, in order to protect compressor, generally the compressor current testing circuit need be set.Prior art mainly is to detect the single-phase current size of compressor for the current detecting of compressor of air conditioner, judges whether the compressor single-phase current is excessive or too small, reaches the purpose of compressor protection.Because three-phase current unbalance can cause electric rotating machine under asymmetrical state, to move usually, make rotor produce added losses and heating, thereby cause motor integral body or local heating, decrease in efficiency, energy consumption increases; The reversed magnetic field produces additional moment and can make motor appearance vibration in addition, and the imbalance between each phase can cause shorten the serviceable life of compressor.
The utility model content
The technical matters that the utility model solves is: make up a kind of compressor of air conditioner current detection circuit, overcome prior art and do not detect the technical matters that three-phase current influences operation of air conditioner even serviceable life.
The technical scheme of the utility model is: make up a kind of compressor of air conditioner current detection circuit; Comprise current detecting unit and processing unit; Said current detecting unit comprises three current detection modules that detect the compressor of air conditioner three-phase current respectively, and said current detection module comprises current transformer, artifical resistance, commutation diode, electrochemical capacitor and first shunt resistance and second shunt resistance, and said current transformer connects the phase current input in the compressor of air conditioner three-phase current; Said artifical resistance is parallelly connected with said current transformer; Said rectification diode is anodal to be connected with the output terminal of said current transformer, and said first shunt resistance connects the negative pole of said rectification diode, and the other end connects second shunt resistance; The said second shunt resistance other end connects said rectification diode positive pole after connecting said artifical resistance; Said electrochemical capacitor is parallelly connected with said second shunt resistance, said electrochemical capacitor one end connection processing unit, other end ground connection.
The further technical scheme of the utility model is: said current detection circuit also comprises catching diode; Said catching diode positive pole connects the common junction of said first shunt resistance, said second shunt resistance, said electrochemical capacitor, said catching diode negative pole output voltage.
The further technical scheme of the utility model is: said current detection circuit also comprises filter unit, and said filter unit comprises filter resistance, filter capacitor, said filter capacitor one termination processing unit, other end ground connection; The common junction of said first shunt resistance of said filter resistance one termination, said second shunt resistance, said electrochemical capacitor, another termination processing unit.
The further technical scheme of the utility model is: said current detection circuit also comprises the detected state output unit to detected state output.
The further technical scheme of the utility model is: said current detection circuit also comprises the status display unit that output state is shown.
The further technical scheme of the utility model is: said status display unit also comprises and detects first alarm unit that electric current is reported to the police when excessive.
The further technical scheme of the utility model is: said status display unit also comprises second alarm unit of reporting to the police when detecting three-phase current unbalance.
The technique effect of the utility model is: make up a kind of compressor of air conditioner current detection circuit; Three road current detection modules are set to be detected three-phase current respectively; Through detection, when detecting three-phase current unbalance, take measures air-conditioning is effectively protected to the air-conditioning three-phase current.
Description of drawings
Fig. 1 is the testing circuit figure of the utility model.
Fig. 2 the utility model three-phase detection circuit diagram.
The structured flowchart of Fig. 3 the utility model.
Embodiment
Below in conjunction with specific embodiment, the utility model technical scheme is further specified.
Like Fig. 1, shown in Figure 2; Embodiment of the present invention is: make up a kind of compressor of air conditioner current detection circuit; Comprise current detecting unit and processing unit; Said current detecting unit comprises three current detection modules that detect the compressor of air conditioner three-phase current respectively, below is that example describes with the circuit diagram that detects the U phase current among Fig. 2: said current detection module comprises current transformer T1, artifical resistance R46, commutation diode D2, electrochemical capacitor E2 and the first shunt resistance R47 and the second shunt resistance R1, and said current transformer T1 connects the phase current input current input in the compressor of air conditioner three-phase current; Said artifical resistance R46 is parallelly connected with said current transformer T1; Said rectification diode D2 is anodal to be connected with the output terminal of said current transformer T1, and the said first shunt resistance R47 connects the negative pole of said rectification diode D2, and the other end connects the second shunt resistance R1; The said second shunt resistance R1 other end connects said rectification diode D2 positive pole after connecting said artifical resistance R46; Said electrochemical capacitor E2 is parallelly connected with the said second shunt resistance R1, said electrochemical capacitor one end connection processing unit, other end ground connection.
Like Fig. 1, shown in Figure 2; The practical implementation process of the utility model is following: current transformer T1 is actual to be a linear transformer, its input current (sensed current) and the Inside coil number of turn proportional (be ac flow) of output current with it.If the detection current value is I, according to fixing primary/secondary coil turn ratio (constant) C of current transformer, can confirm output current (for exchanging) Ia=I/C, when choosing pull-up resistor R46, its resistance is far smaller than two divider resistance values.Like this, the resistance of R46 approximates actual pull-up resistor value.So, the voltage U a=R46 at R46 two ends * Ia=(R46 * I)/C; This current value is an ac voltage, after through commutation diode D2 half-wave rectification, the negative pole of diode D2 and the DC voltage V2=between the ground (√ 2/2) * Ua=(0.707 * R46 * I)/C, cut the about 0.5V of pressure drop on the diode.DC voltage V2 is dividing potential drop on divider resistance R47 and R1; Draw magnitude of voltage V2=[R47 ÷ (R47+ R1)] * Ua=[R47 ÷ (the R47+ R1)] of R47 and R1 common port * [(0.707 * R46 * I)/C-0.5], Here it is finally is input to the detection current parameters analog quantity that processing unit detects mouthful.
Like Fig. 1, shown in Figure 2; Preferred implementation of the present invention is: said current detection circuit also comprises catching diode D1; Said catching diode D1 positive pole connects the common junction of the said first shunt resistance R47, the said second shunt resistance R1, said electrochemical capacitor E2, said catching diode D1 negative pole output voltage.Guarantee that the analog quantity that is input to processing unit is not more than 5V, promptly guarantee the voltage that b, c are ordered, in order to avoid defective chip.
Like Fig. 1, shown in Figure 2, preferred implementation of the present invention is: said current detection circuit also comprises filter unit, and said filter unit comprises filter resistance R48, filter capacitor C1, said filter capacitor C1 one termination processing unit, other end ground connection; The common junction of the said first shunt resistance R47 of said filter resistance R48 one termination, the said second shunt resistance R1, said electrochemical capacitor E2, another termination processing unit.Because the chip required input electric current of processing unit is minimum; Here it is added between the chip and input quantity of processing unit, can produce pressure drop, therefore can not influence the accuracy of sampling; But the output signal to current detection circuit has carried out filtering, prevents high frequency interference.
As shown in Figure 3; Preferred implementation of the present invention is: said current detection circuit also comprises the detected state output unit to detected state output; Said detected state output unit is with the current status output that detects, and the way of output comprises demonstration output, printout, voice output etc.
As shown in Figure 3, preferred implementation of the present invention is: said current detection circuit also comprises the status display unit that output state is shown.Said status display unit also comprises and detects the first alarm unit (not shown) that electric current is reported to the police when excessive.Said status display unit also comprises the second alarm unit (not shown) of reporting to the police when detecting three-phase current unbalance.
The technique effect of the utility model is: make up a kind of compressor of air conditioner current detection circuit; Three road current detection modules are set to be detected three-phase current respectively; Through detection, when detecting three-phase current unbalance, take measures air-conditioning is effectively protected to the air-conditioning three-phase current.
Above content is the further explain that combines concrete preferred implementation that the utility model is done, and can not assert that the practical implementation of the utility model is confined to these explanations.For the those of ordinary skill of technical field under the utility model, under the prerequisite that does not break away from the utility model design, can also make some simple deduction or replace, all should be regarded as belonging to the protection domain of the utility model.
Claims (7)
1. compressor of air conditioner current detection circuit; It is characterized in that, comprise current detecting unit and processing unit, said current detecting unit comprises three current detection modules that detect the compressor of air conditioner three-phase current respectively; Said current detection module comprises current transformer, artifical resistance, commutation diode, electrochemical capacitor and first shunt resistance and second shunt resistance; Said current transformer connects the phase current input in the compressor of air conditioner three-phase current, and said artifical resistance is parallelly connected with said current transformer, and said rectification diode is anodal to be connected with the output terminal of said current transformer; Said first shunt resistance connects the negative pole of said rectification diode; The other end connects second shunt resistance, and the said second shunt resistance other end connects said rectification diode positive pole after connecting said artifical resistance, and said electrochemical capacitor is parallelly connected with said second shunt resistance; Said electrochemical capacitor one end connection processing unit, other end ground connection.
2. according to the said compressor of air conditioner current detection circuit of claim 1; It is characterized in that; Said current detection circuit also comprises catching diode; Said catching diode positive pole connects the common junction of said first shunt resistance, said second shunt resistance, said electrochemical capacitor, said catching diode negative pole output voltage.
3. according to the said compressor of air conditioner current detection circuit of claim 1, it is characterized in that said current detection circuit also comprises filter unit, said filter unit comprises filter resistance, filter capacitor, said filter capacitor one termination processing unit, other end ground connection; The common junction of said first shunt resistance of said filter resistance one termination, said second shunt resistance, said electrochemical capacitor, another termination processing unit.
4. according to the said compressor of air conditioner current detection circuit of claim 1, it is characterized in that said current detection circuit also comprises the detected state output unit to detected state output.
5. according to the said compressor of air conditioner current detection circuit of claim 1, it is characterized in that said current detection circuit also comprises the status display unit that output state is shown.
6. according to the said compressor of air conditioner current detection circuit of claim 5, it is characterized in that said status display unit also comprises and detects first alarm unit that electric current is reported to the police when excessive.
7. according to the said compressor of air conditioner current detection circuit of claim 5, it is characterized in that said status display unit also comprises second alarm unit of reporting to the police when detecting three-phase current unbalance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203183735U CN202204866U (en) | 2011-08-29 | 2011-08-29 | Current detection circuit for air-conditioner compressor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203183735U CN202204866U (en) | 2011-08-29 | 2011-08-29 | Current detection circuit for air-conditioner compressor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202204866U true CN202204866U (en) | 2012-04-25 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011203183735U Expired - Fee Related CN202204866U (en) | 2011-08-29 | 2011-08-29 | Current detection circuit for air-conditioner compressor |
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| CN (1) | CN202204866U (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103199679A (en) * | 2013-04-18 | 2013-07-10 | 电子科技大学 | Equalized current output circuit of insulated gate bipolar transistor |
| CN103280775A (en) * | 2013-06-27 | 2013-09-04 | 电子科技大学 | Insulated gate bipolar transistor parallel output dynamic delay over-current protection circuit |
| CN105259401A (en) * | 2015-10-19 | 2016-01-20 | 珠海格力电器股份有限公司 | Air conditioner load current detection device and system |
| 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 |
| CN109579389A (en) * | 2018-11-30 | 2019-04-05 | 广东美的制冷设备有限公司 | Air-conditioning system, frequency-variable controller and its alternating current evaluation method and device |
| CN109595737A (en) * | 2018-11-30 | 2019-04-09 | 广东美的制冷设备有限公司 | Air-conditioning system, frequency-variable controller and its alternating current evaluation method and device |
| CN111293926A (en) * | 2020-04-14 | 2020-06-16 | 姜武刚 | Motor idling shutdown control circuit and control method |
| CN111342740A (en) * | 2020-04-14 | 2020-06-26 | 姜武刚 | Motor locked-rotor control circuit and control method |
-
2011
- 2011-08-29 CN CN2011203183735U patent/CN202204866U/en not_active Expired - Fee Related
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103199679A (en) * | 2013-04-18 | 2013-07-10 | 电子科技大学 | Equalized current output circuit of insulated gate bipolar transistor |
| CN103199679B (en) * | 2013-04-18 | 2015-04-15 | 电子科技大学 | Equalized current output circuit of insulated gate bipolar transistor |
| CN103280775A (en) * | 2013-06-27 | 2013-09-04 | 电子科技大学 | Insulated gate bipolar transistor parallel output dynamic delay over-current protection circuit |
| CN103280775B (en) * | 2013-06-27 | 2015-11-25 | 电子科技大学 | Insulated gate bipolar transistor Parallel opertation dynamic delay current foldback circuit |
| CN105259401A (en) * | 2015-10-19 | 2016-01-20 | 珠海格力电器股份有限公司 | Air conditioner load current detection device and system |
| 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 |
| CN109579389A (en) * | 2018-11-30 | 2019-04-05 | 广东美的制冷设备有限公司 | Air-conditioning system, frequency-variable controller and its alternating current evaluation method and device |
| CN109595737A (en) * | 2018-11-30 | 2019-04-09 | 广东美的制冷设备有限公司 | Air-conditioning system, frequency-variable controller and its alternating current evaluation method and device |
| CN109579389B (en) * | 2018-11-30 | 2021-10-26 | 广东美的制冷设备有限公司 | Air conditioning system, variable frequency controller and alternating current estimation method and device thereof |
| CN109595737B (en) * | 2018-11-30 | 2021-10-26 | 广东美的制冷设备有限公司 | Air conditioning system, variable frequency controller and alternating current estimation method and device thereof |
| CN111293926A (en) * | 2020-04-14 | 2020-06-16 | 姜武刚 | Motor idling shutdown control circuit and control method |
| CN111342740A (en) * | 2020-04-14 | 2020-06-26 | 姜武刚 | Motor locked-rotor control circuit and control method |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120425 Termination date: 20200829 |
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| CF01 | Termination of patent right due to non-payment of annual fee |