CN2777555Y - Circuit device for detecting compressor current - Google Patents
Circuit device for detecting compressor current Download PDFInfo
- Publication number
- CN2777555Y CN2777555Y CNU2004200957819U CN200420095781U CN2777555Y CN 2777555 Y CN2777555 Y CN 2777555Y CN U2004200957819 U CNU2004200957819 U CN U2004200957819U CN 200420095781 U CN200420095781 U CN 200420095781U CN 2777555 Y CN2777555 Y CN 2777555Y
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- Control Of Motors That Do Not Use Commutators (AREA)
- Measurement Of Current Or Voltage (AREA)
Abstract
The utility model relates to a circuit device for detecting compressor current, wherein a detecting circuit of the device comprises a current transformer TT1; the current transformer TT1 is connected with a signal acquisition circuit which comprises a load resistor, a finger striking switch of the load resistor, a rectifying diode D1, a constant current resistor R1 of the rectifying diode D1, a wave filtering commutation capacitor C1, voltage dividing resistors R2 and R4, an isolating resistor R3, a voltage stabilizing diode Z1 and a wave filtering capacitor; the signal acquisition circuit is connected with a comparison circuit composed of an integrated operation module; the comparison circuit is connected with an optical coupled circuit, and then, the comparison circuit is connected with a compressor circuit and controls the compressor circuit. The utility model overcomes the defects of the existing art for detecting compressor current, and adopts the double voltage comparator operation module to detect the compressor current, and also, an A/D conversion port of MCU does not need to pass through and the function of detecting compressor current can be realized, and accordingly, the protection action is worked out and the function of over current protection for compressors is realized. The utility model has the advantages of simple and reliable circuit design and low cost.
Description
Technical field
The utility model relates to a kind of air conditioner pick-up unit, is meant a kind of circuit arrangement that detects the cooler compressor electric current especially.
Background technology
In order to protect the heart of air conditioner---compressor, prevent to transship so that burn the appearance of phenomenon, generally all be provided with overload protection arrangement in compressor side, the device that detects the cooler compressor electric current is exactly one of them.At present, when detecting the cooler compressor electric current, generally all adopt current transformer to detect the compressor current value, the A/D mouth from miniature programming controller MCU after conversion, rectification is imported, and carries out the technology of A/D conversion, computing.There is following shortcoming in these technology: 1, can take an IO mouth of master chip, the waste resources of chip; 2, compressor immediate current value when starting will influence the reliability of chip operation greater than 5V, fragile MCU up to 3 to 5 times of rated current so be input to the voltage analog of chip I mouth.For these problems, disclosed by retrieval Chinese patent literature still finds no and imitates the ground improvement project.
The utility model content
The device that provides a kind of detection compressor current that addresses the above problem to be solved in the utility model.
Problem according to above-mentioned required solution has designed a kind of circuit arrangement that detects compressor current, and this Device Testing circuit comprises current transformer TT
1, with current transformer TT
1What connect is signal acquisition circuit, and signal acquisition circuit connects with comparator circuit, and comparator circuit connects with optically coupled circuit and afterwards connects with compressor circuit and realize control to compressor circuit.Wherein, with current transformer TT
1The signal acquisition circuit that connects comprises pull-up resistor and thumb-acting switch thereof, electric current behind pull-up resistor in regular turn through commutation diode D
1And constant current resistance R
1With electrochemical capacitor C
1Filter rectification, divider resistance R
2And R
4, isolation resistance R
3And voltage stabilizing diode Z
1With filter capacitor C
2The comparator circuit that connects with signal acquisition circuit comprises the comparer computing module U that is coupled to each other
A, U
BAnd peripheral circuit, be input to computing module U from the electric signal of signal acquisition circuit
APin 3 and compare with the reference voltage of pin 2, pass the signal along to computing module U from pin 1 then
BPin 5 and compare with the reference voltage of pin 6, comparative result is used for controlling the break-make of optically coupled circuit from pin 7 outputs.Optically coupled circuit is accepted the output signal of comparator circuit, and optically coupled circuit comprises provides the divider resistance of reference voltage R
10With mutual serial connection and be connected in parallel on the resistance R of output terminal
11, C
8, output terminal connects with action element, the break-make of action element control compressor circuit.
The utility model has overcome the deficiency of existing detection compressor current technology; use two voltage comparator computing modules to detect compressor current; need just can not realize that compressor current detects, and make the action realization compressor excess current protective function of protection through the A/D conversion mouth of MCU.Circuit design is simple, reliable, with low cost.
Description of drawings
Accompanying drawing is the circuit theory synoptic diagram of the utility model one embodiment.
Embodiment
The technical scheme that the utility model is dealt with problems is: the effect of designed circuit is to detect compressor current; core parts are two voltage comparator integrated packages; rated current that reaches when compressor current and duration are when arriving; the output protection signal; outdoor protective wire and zero line are cut off, realize the compressor excess current protective function.The utility model is described in further detail below in conjunction with accompanying drawing:
With the current transformer TT that from circuit, gathers current signal
1What connect is signal acquisition circuit, this current transformer is actual to be a linear transformer, detected compressor alternating current is changed into the little alternating current that can take a sample, its input current (sensed current) and the Inside coil number of turn proportional (be ac flow) of output current with it.Signal acquisition circuit comprises and is used to select pull-up resistor R
XnThumb-acting switch JP
1Little electric current after also be about to transforming changes into the commutation diode D that the fictitious load resistance of alternating voltage, the alternating voltage (half-wave) after will transforming are rectified into DC voltage
1And constant current resistance R
1, the DC voltage waveform after the level and smooth rectification and be entered into the electrochemical capacitor C of comparer input port
1Also comprise the parameter that is used to adjust conversion and directly determine to be input to the ultimate value that the divider resistance of the magnitude of voltage of comparer input port, the voltage that is used for the voltage stabilizing of compressor start stage and guarantees to be input to the comparer input port are not more than comparer, play the stabilivolt of the effect (being equivalent to clamping action) of protection comparer; The connection of signal acquisition circuit is in proper order, behind the pull-up resistor in regular turn through commutation diode D
1And constant current resistance R
1With electrochemical capacitor C
1Filter rectification, divider resistance R
2And R
4, isolation resistance R
3And voltage stabilizing diode Z
1With filter capacitor C
2, connect with the input port of comparer then.
As shown in FIG., the core parts in the utility model circuit are two integrated computing modules of voltage comparator, and for ease of explanation, two voltage comparators with computing module in the circuit are split up into U
AAnd U
BAmong the figure, comparer U
APass through resistance R
5And R
6Get reference voltage (the 2nd pin), as comparer U
AInput port (the 3rd pin) voltage in case greater than this reference value, comparer U
ADelivery outlet (the 1st pin) just move---becoming unsettled by ground state is high-impedance state.Like this, circuit passes through R
7Give electrochemical capacitor C
5Charging, after continuing for some time, electrochemical capacitor C
5On fill voltage greater than comparer U
BBy resistance R
8And R
9During the reference voltage that obtains, comparer U
BDelivery outlet (the 7th pin) just become unsettled by ground state.Like this, optically coupled circuit becomes from conducting and ends, and outdoor protection output line and zero line N are cut off, and realizes the overcurrent protection function of compressor.At this, resistance R
7Be big resistance resistance, and capacitor C
5Be the low-loss electrochemical capacitor, purpose is in order to prolong comparer U
BActuation time, the big electric current when so just having avoided compressor start (starting current is quite big under the normal condition).From as seen above-mentioned, adopt the utility model to carry out compressor current and detect and make protection and do the difference of A/D conversion process huge with MCU.
In use, as comparer U
AThe corresponding after treatment voltage of the promptly actual compressor current of the voltage at the 3rd pin place, input port during greater than its reference voltage, comparer U
AJust become high-impedance state by ground state, circuit passes through R
7Give electrochemical capacitor C
5Charging, the duration of charging tries to achieve by following formula: U
C5=V
DD[1-e (t/ τ)], τ=R in the formula * C.Resistance R herein
7With electrochemical capacitor C
5Choose and determined compressor current to surpass protection to be worth the duration of charging t that the protection action takes place, also be that compressor current surpasses the protection value and must continue for some time t, the time period of high current phase when duration of charging t must be greater than compressor start, protection is generation; So although compressor start its electric current of moment can reach 3 to 5 times rated current, the mistake protection can not take place, and the duration of charging surpasses the lasting t of the compressor current of setting after the time, close compressor.Generally speaking, the capacitor C of selecting for use
5Value less, resistance R
7Resistance relatively large.
The utility model is provided with four current protection values at the signal acquisition part branch, and each current value can be by selecting pull-up resistor R
XnGuarantee that the protection magnitude of voltage of handling out at last is comparer U
AReference voltage.At this by resistance R
1Commutation diode D flows through when assurance is in protection
1Electric current be steady state value because the pressure drop of this diode also be a constant, so guaranteed the accuracy of current detecting; But resistance R
1With pull-up resistor R
XnOn the same order of magnitude, so actual loading resistance is by R
1And R
XnCommon definite.In addition, electrochemical capacitor C
1Be used for smooth waveform, resistance R
2And R
4Be divider resistance, R
3Be isolation resistance, stabilivolt Z
1Do not have effect during less than its operating voltage in its both end voltage, just greater than the time such as the compressor start stage play pressure stabilization function, guarantee to be input to comparer U
AVoltage be not more than its operating voltage, play protection comparer U
AEffect also be clamping action; Electrochemical capacitor C
3Be used for power filter; Comparer computing module U
AThe reference voltage of x then passes through resistance R
5And R
6Obtain.
In sum, we can calculate and choose by experiment suitable components and parts according to the foregoing circuit principle under the situation that does not need MCU detection control, realize detection of compressor excess current and protection.
Claims (6)
1, a kind of circuit arrangement that detects compressor current, this Device Testing circuit comprises current transformer TT
1, it is characterized in that and current transformer TT
1What connect is signal acquisition circuit, and signal acquisition circuit connects with comparator circuit, and comparator circuit connects with optically coupled circuit and afterwards connects with compressor circuit and realize control to compressor circuit.
2, the circuit arrangement of detection compressor current according to claim 1 is characterized in that and current transformer TT
1The signal acquisition circuit that connects comprises pull-up resistor and thumb-acting switch thereof, electric current behind pull-up resistor in regular turn through commutation diode D
1And constant current resistance R
1With electrochemical capacitor C
1Filter rectification, divider resistance R
2And R
4, isolation resistance R
3And voltage stabilizing diode Z
1With filter capacitor C
2
3, the circuit arrangement of detection compressor current according to claim 1 and 2 is characterized in that the comparator circuit that connects with signal acquisition circuit comprises the comparer computing module U that is coupled to each other
A, U
BAnd peripheral circuit, be input to computing module U from the electric signal of signal acquisition circuit
APin 3 and compare with the reference voltage of pin 2, pass the signal along to computing module U from pin 1 then
BPin 5 and compare with the reference voltage of pin 6, comparative result is used for controlling the break-make of optically coupled circuit from pin 7 outputs.
4, the circuit arrangement of detection compressor current according to claim 3 is characterized in that comparer computing module U
AReference voltage pass through resistance R
5And R
6Obtain.
5, the circuit arrangement of detection compressor current according to claim 3 is characterized in that comparer computing module U
BReference voltage pass through resistance R
8And R
9Obtain.
6, the circuit arrangement of detection compressor current according to claim 1 and 2 is characterized in that optically coupled circuit accepts the output signal of comparator circuit, and optically coupled circuit comprises provides the divider resistance of reference voltage R
10With mutual serial connection and be connected in parallel on the resistance R of output terminal
11, C
8, output terminal connects with action element, the break-make of action element control compressor circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2004200957819U CN2777555Y (en) | 2004-11-19 | 2004-11-19 | Circuit device for detecting compressor current |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2004200957819U CN2777555Y (en) | 2004-11-19 | 2004-11-19 | Circuit device for detecting compressor current |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2777555Y true CN2777555Y (en) | 2006-05-03 |
Family
ID=36744939
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2004200957819U Expired - Fee Related CN2777555Y (en) | 2004-11-19 | 2004-11-19 | Circuit device for detecting compressor current |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2777555Y (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101561456B (en) * | 2008-04-15 | 2012-05-23 | 上海电气集团股份有限公司 | Direct current side high-voltage detecting method of compressor driver |
| CN102759657A (en) * | 2011-04-28 | 2012-10-31 | 上海西门子线路保护系统有限公司 | System and method for detecting coupling current |
| CN103061940A (en) * | 2011-10-24 | 2013-04-24 | 联创汽车电子有限公司 | Acquisition and processing circuit of oil sprayer driving currents |
| CN105864007A (en) * | 2015-01-23 | 2016-08-17 | 广东美的制冷设备有限公司 | Protection device for compressor control circuit and control method thereof |
| CN106902430A (en) * | 2017-02-21 | 2017-06-30 | 深圳市德达电器有限公司 | A kind of intelligent health-care type oxygen machine |
-
2004
- 2004-11-19 CN CNU2004200957819U patent/CN2777555Y/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101561456B (en) * | 2008-04-15 | 2012-05-23 | 上海电气集团股份有限公司 | Direct current side high-voltage detecting method of compressor driver |
| CN102759657A (en) * | 2011-04-28 | 2012-10-31 | 上海西门子线路保护系统有限公司 | System and method for detecting coupling current |
| CN103061940A (en) * | 2011-10-24 | 2013-04-24 | 联创汽车电子有限公司 | Acquisition and processing circuit of oil sprayer driving currents |
| CN103061940B (en) * | 2011-10-24 | 2015-03-18 | 联创汽车电子有限公司 | Acquisition and processing circuit of oil sprayer driving currents |
| CN105864007A (en) * | 2015-01-23 | 2016-08-17 | 广东美的制冷设备有限公司 | Protection device for compressor control circuit and control method thereof |
| CN106902430A (en) * | 2017-02-21 | 2017-06-30 | 深圳市德达电器有限公司 | A kind of intelligent health-care type oxygen machine |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |