CN106526343B - The detection method of compressor phase shortage electric current - Google Patents
The detection method of compressor phase shortage electric current Download PDFInfo
- Publication number
- CN106526343B CN106526343B CN201611085354.6A CN201611085354A CN106526343B CN 106526343 B CN106526343 B CN 106526343B CN 201611085354 A CN201611085354 A CN 201611085354A CN 106526343 B CN106526343 B CN 106526343B
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- Prior art keywords
- phase
- voltage
- compressor
- current
- electric current
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
- G01R29/16—Measuring asymmetry of polyphase networks
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/0092—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring current only
Abstract
The invention discloses a kind of detection methods of compressor phase shortage electric current, comprising the following steps: the capacitance initial voltage V of measurement RC circuit0, the capacitor of measurement RC circuit is full of voltage Vu, measure actual samples electric current Is；Pass through capacitance initial voltage V0, time constant RC, turn-on time △ T obtain the charging voltage V after △ T charges△T；Voltage V is full of by voltage capacitoru、V△T, obtain charge percentage P；Pass through the percentage P of charging, sample rate current IsObtain actual phase current Ir.The detection method can accurately detect the phase shortage electric current of high-power compressor, to improve the accuracy of compressor pile defection.
Description
Technical field
The present invention relates to the pile defection technical fields of compressor, are especially a kind of detection side of compressor phase shortage electric current
Method.
Background technique
When compressor is run, if any Xiang Huilu opens a way in U, V, W three-phase, it is possible that following two feelings
Condition: one, the phase current of non-open phase is increased to suddenly near compressor demagnetization current threshold line；Two, as phase shortage and caused by drive
The bad vibration for making pipeline unreasonable.The Vibration Condition of the lasting impact of above-mentioned electric current or pipeline not only will affect compressor
Performance, and will cause the irreversible damage of air conditioner body.
When carrying out pile defection, the turn-on sequence of U, V, W are fixed in each carrier cycle, wherein the turn-on time of a phase is solid
Determine A, the turn-on time of another two-phase is A- △ T.A is determined that △ T depends on the size of compressor current by carrier cycle.It is tied in △ T
Certain moment before beam acquires the actual current of compressor and target current is compared to adjust △ T.
Since load impedance when compressor drum, which is in, shuts down state is very small, so that alternate coil is led
Lead to time △ T-phase to small.Especially when the anti-compressor types of matching such as 3HP, 5T high-power low, the conducting of alternate coil
Time △, T-phase was to smaller.It will cause sampled current signals in this way to become smaller, so that the sample rate current that microprocessor obtains becomes
It is small, so that its phase current being calculated also becomes smaller, and then influence the accuracy of compressor pile defection.
Summary of the invention
The technical problem to be solved by the present invention is to provide a kind of detection method of compressor phase shortage electric current, the detection method
The phase shortage electric current of high-power compressor can be accurately detected, to improve the accuracy of compressor pile defection.
The technical scheme is that providing a kind of detection method of compressor phase shortage electric current, compressor U, V, W tri- is set
The turn-on time of a wherein phase in phase is A, then the turn-on time of other two-phase is A- △ T, and A is determined that △ T takes by carrier cycle
Certainly in the size of compressor current, △ T is that three-phase simultaneously turns on the time；Setting carrier cycle is T；One RC circuit is set, it should
The time constant of RC circuit is RC；The following steps are included:
(1), the capacitance initial voltage V of RC circuit is measured0, the capacitor of measurement RC circuit is full of voltage Vu, measure sample rate current
Is；
(2), pass through capacitance initial voltage V0, time constant RC, turn-on time △ T obtain the charging electricity after △ T charges
Press V△T；
(3), voltage V is full of by voltage capacitoru, charging voltage V△T, obtain charge percentage P；
(4), pass through the percentage P of charging, sample rate current IsObtain actual phase current Ir。
The charging voltage V△T=V0+(Vu-V0)*[1-exp(-△T/RC)]。
The charge percentage P=V△T/Vu。
The actual phase current Ir=Is/P。
After above method, compared with prior art, the present invention having the advantage that
The detection method of compressor phase shortage electric current of the present invention passes through capacitance initial voltage V0, capacitor be full of voltage VuAnd it leads
Lead to time △ T three to judge charge percentage P, that is, replaces being connected in the past by charge percentage P, time constant RC
Time △ T.This ensure that sampled current signals are by turn-on time △ T, to guarantee the sample rate current that microprocessor obtains
It is more accurate, so that its phase current being calculated is also more accurate, and then it ensure that the accurate of compressor pile defection
Property.
Detailed description of the invention
Fig. 1 is the schematic block circuit diagram of the detection method of compressor phase shortage electric current of the present invention.
Fig. 2 is that the conducting of the detection method of compressor phase shortage electric current of the present invention disconnects schematic diagram.
Specific embodiment
The present invention will be further explained below with reference to the attached drawings and specific examples.
As shown in Figure 1 and Figure 2, U, V, W tri- of compressor, which is conducted, is realized by 6 switching devices of SW1~SW6, figure
1 is schematic diagram.SW1 and SW2 is the upper bridge arm and lower bridge arm of U phase respectively, and SW3 and SW4 are the upper bridge arm and lower bridge of V phase respectively
Arm, SW5 and SW6 are the upper bridge arm and lower bridge arm of W phase respectively.The upper and lower bridge arm of identical phase cannot simultaneously turn on, it is out of phase on
Lower bridge arm conducting could form circuit loop with V1, and V1 input voltage is generally in 280V~380V.Such as SW1, SW4 and SW6 are led
Logical, remaining disconnection, then electric current flows through SW1 by V1 anode and flows into from U phase, then flows back to V1 respectively from V phase, SW4 and W phase, SW6 and bear
Pole.What △ T was indicated is exactly in the time of carrier cycle inner looping conducting, remaining time is then to keep electric current by continuous current circuit
Duration；Microprocessor can drive SW1~SW6, can also detect the voltage on the capacitor C of RC circuit circuit.
A kind of detection method of compressor phase shortage electric current of the present invention, is arranged the wherein phase in compressor U, V, W three-phase
Turn-on time is A, then the turn-on time of other two-phase is A- △ T, and A is determined by carrier cycle, and △ T depends on compressor current
Size, △ T are that three-phase simultaneously turns on the time；Setting carrier cycle is T；One RC circuit, the time constant of the RC circuit are set
For RC；The following steps are included:
(1), the capacitance initial voltage V of RC circuit is measured0, the capacitor of measurement RC circuit is full of voltage Vu, measure sample rate current
Is；
(2), pass through capacitance initial voltage V0, time constant RC, turn-on time △ T obtain the charging electricity after △ T charges
Press V△T；
(3), voltage V is full of by voltage capacitoru, charging voltage V△T, obtain charge percentage P；
(4), pass through the percentage P of charging, sample rate current IsObtain actual phase current Ir。
The charging voltage V△T=V0+(Vu-V0) * [1-exp (- △ T/RC)], it is general that capacitance initial voltage V is set0For
0V；
The charge percentage P=V△T/Vu。
The actual phase current Ir=Is/P。
Only highly preferred embodiment of the present invention is described above, but is not to be construed as limiting the scope of the invention.This
Invention is not limited only to above embodiments, and specific structure is allowed to vary.In every case in the protection model of independent claims of the present invention
Interior made various change is enclosed to be within the scope of the invention.
Claims (2)
1. a kind of detection method of compressor phase shortage electric current, it is characterised in that: the wherein phase in setting compressor U, V, W three-phase
Turn-on time be A, then the turn-on time of other two-phase is A- △ T, and A determines by carrier cycle, and △ T depends on compressor current
Size, △ T be three-phase simultaneously turn on the time；Setting carrier cycle is T；One RC circuit is set, and the time of the RC circuit is normal
Number is RC；The following steps are included:
(1), the capacitance initial voltage V of RC circuit is measured0, the capacitor of measurement RC circuit is full of voltage Vu, measure actual samples electric current
Is；
(2), pass through capacitance initial voltage V0, time constant RC, turn-on time △ T obtain the charging voltage V after △ T charges△T；
(3), voltage V is full of by voltage capacitoru, charging voltage V△T, obtain charge percentage P, the charge percentage P=
V△T/Vu；
(4), pass through the percentage P of charging, sample rate current IsObtain actual phase current Ir, the actual phase current Ir=Is/P。
2. the detection method of compressor phase shortage electric current according to claim 1, it is characterised in that: the charging voltage V△T=
V0+(Vu-V0)*[1-exp(-△T/RC)]。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611085354.6A CN106526343B (en) | 2016-11-30 | 2016-11-30 | The detection method of compressor phase shortage electric current |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611085354.6A CN106526343B (en) | 2016-11-30 | 2016-11-30 | The detection method of compressor phase shortage electric current |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106526343A CN106526343A (en) | 2017-03-22 |
| CN106526343B true CN106526343B (en) | 2019-05-14 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201611085354.6A Active CN106526343B (en) | 2016-11-30 | 2016-11-30 | The detection method of compressor phase shortage electric current |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112086937B (en) * | 2019-06-14 | 2023-04-21 | 广东芬尼克兹节能设备有限公司 | Method, device and system for judging phase failure of compressor motor |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100238187B1 (en) * | 1997-09-02 | 2000-01-15 | 윤종용 | Phase error detection apparatus for three phase ac power source |
| DE102004040051A1 (en) * | 2004-08-18 | 2006-03-09 | Siemens Ag | Method of regulating amplification errors in three phase current measurement of inverter forms corrections from real and imaginary digital signal data and applies to measured signals |
| CN202256627U (en) * | 2011-09-08 | 2012-05-30 | 山西太钢不锈钢股份有限公司 | On-line monitoring device of motor |
| CN105953372B (en) * | 2016-05-20 | 2019-05-17 | 广东美的暖通设备有限公司 | Phase shortage control method, phase shortage control device and the air conditioner of compressor |
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