CN105259401A - Air conditioner load current detection device and system - Google Patents
Air conditioner load current detection device and system Download PDFInfo
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- CN105259401A CN105259401A CN201510685658.5A CN201510685658A CN105259401A CN 105259401 A CN105259401 A CN 105259401A CN 201510685658 A CN201510685658 A CN 201510685658A CN 105259401 A CN105259401 A CN 105259401A
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- 238000004891 communication Methods 0.000 abstract description 9
- 238000013461 design Methods 0.000 abstract description 5
- 238000004378 air conditioning Methods 0.000 abstract description 3
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Abstract
The invention discloses an air conditioner load current detection device and system. This air conditioner load current detection device includes: the current sensor is connected in series to a line where an air conditioner load is located and used for inducing current by utilizing a mutual inductance phenomenon, converting a current signal obtained by induction into a voltage signal and outputting the voltage signal; the MCU is connected to the voltage output end of the current sensor and used for receiving the voltage signal and outputting the current which is obtained by calculation according to the voltage signal and passes through the air-conditioning load; the MCU includes: the CAN communication module is connected with a CAN bus through the CAN interface and transmits the calculated current passing through the air conditioner load by using the CAN bus. The current detection device uses the current sensor, the design is simplified, and the MCU has the CAN communication function and CAN quickly exchange data, thereby accelerating the speed of current detection.
Description
Technical field
The present invention relates to air-conditioning technical field, in particular to a kind of air conditioner load current sensing means and system.
Background technology
Within air-conditioning systems, the electric current generally by detecting compressor electric motor judges the duty of compressor, thus carries out servocontrol to compressor in steering logic.Current electric current detecting method is as follows: allow high pressure conductive track by Current Mutual Inductance coil, by magnetic field mutual inductance effect, mutual inductance electric current is produced in mutual inductor, calculate mutual inductance electric current by the voltage signal of Current Mutual Inductance coil output and outer meeting resistance, thus obtain the electric current on high-tension line.
But, for above-mentioned current detecting mode, calculate transmission current method by Current Mutual Inductance coil loaded down with trivial details, very large deviation is there will be when detecting small area analysis signal, and the current signal finally obtained also needs to be transferred to master control by external check-out console, whole system design is loaded down with trivial details, uses inconvenience.
Summary of the invention
A kind of air conditioner load current sensing means and system is provided, at least to solve in prior art the loaded down with trivial details problem of the system of measuring air conditioner load electric current in the embodiment of the present invention.
For achieving the above object, embodiments provide a kind of air conditioner load current sensing means, comprise: current sensor and micro-control unit (MicroControllerUnit, referred to as MCU), wherein, described current sensor is connected serially to the circuit at air conditioner load place, induces electric current for utilizing mutual inductance phenomenon, be converted to voltage signal by responding to the current signal obtained, and export described voltage signal; Described MCU is connected to the voltage output end of described current sensor, for receiving described voltage signal, and exports the electric current through described air conditioner load calculated according to described voltage signal; Described MCU comprises: controller local area network (ControllerAreaNetwork, referred to as CAN) communication module and CAN interface, described CAN connects CAN by described CAN interface, and utilizes described CAN to transmit the electric current through described air conditioner load calculated.
As preferably, described current sensor comprises: current input terminal, current output terminal, Current Mutual Inductance coil, rectifier filer, sampling resistor, discharge circuit, voltage output end, power end, earth terminal and external reference voltage input end; Wherein, described current input terminal is connected in series with described current output terminal by the primary side of described Current Mutual Inductance coil, and described current sensor is connected serially to the circuit at described air conditioner load place by described current input terminal and described current output terminal; The secondary side of described Current Mutual Inductance coil is connected in series with described sampling resistor by described rectifier filer; The high-pressure side of described sampling resistor is connected to the normal phase input end of described discharge circuit, and the low-pressure side of described sampling resistor is connected to the inverting input of described discharge circuit, and the output terminal of described discharge circuit is connected to described voltage output end.
As preferably, described discharge circuit comprises: reference voltage input, is connected with described external reference voltage input end, and for providing reference voltage, wherein, the voltage of described reference voltage and described sampling resistor contrasts, and obtains described voltage signal.
As preferably, the voltage follower of the outer setting one-level of described current sensor, is connected to described voltage output end.
As preferably, described MCU also comprises: analog to digital converter, for the described voltage signal received is converted to digital signal by simulating signal.
According to a further aspect in the invention, provide a kind of air conditioner load current detecting system, comprise: host computer master controller, CAN and air conditioner load current sensing means, wherein, described air conditioner load current sensing means is any one air conditioner load current sensing means above-mentioned; Described host computer master controller is connected with described air conditioner load current sensing means by described CAN, and described host computer master controller is used for the electric current through described air conditioner load being received the transmission of described air conditioner load current sensing means by described CAN.
Apply technical scheme of the present invention, use current sensor that the design of pick-up unit is simplified, easy to use, further, MCU possesses CAN communication function, belongs to dereliction transceive communications mode, exchanges data can be carried out fast, thus accelerate the speed of current detecting, also reduce the difficulty of system development simultaneously, facilitate each module in system and replace separately.
Accompanying drawing explanation
Fig. 1 is the structured flowchart of the air conditioner load current sensing means of the embodiment of the present invention;
Fig. 2 is the structural representation of the current sensor of the embodiment of the present invention;
Fig. 3 is the concrete structure schematic diagram of the current sensor of the embodiment of the present invention;
Fig. 4 is the structured flowchart one of the air conditioner load current detecting system of the embodiment of the present invention;
Fig. 5 is the structured flowchart two of the air conditioner load current detecting system of the embodiment of the present invention.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail, but not as a limitation of the invention.
Embodiments provide a kind of air conditioner load current sensing means, as shown in Figure 1, this air conditioner load current sensing means comprises: current sensor 10 and MCU20.
Wherein, current sensor 10 is connected serially to the circuit at air conditioner load 30 place, for utilizing mutual inductance phenomenon to induce electric current, is converted to voltage signal by responding to the current signal obtained, and output voltage signal;
MCU20 is connected to the voltage output end of current sensor 10, for receiver voltage signal, and exports the electric current through air conditioner load 30 calculated according to voltage signal;
MCU20 comprises: CAN 201 and CAN interface 202, and CAN 201 connects CAN by CAN interface 202, and utilizes CAN to transmit the electric current through air conditioner load calculated.
Pass through above-described embodiment, use current sensor that the design of pick-up unit is simplified, easy to use, further, MCU possesses CAN communication function, belongs to dereliction transceive communications mode, exchanges data can be carried out fast, thus accelerate the speed of current detecting, also reduce the difficulty of system development simultaneously, facilitate each module in system and replace separately.
In one embodiment, the structure of current sensor 10 can as shown in Figure 2, and current sensor 10 comprises: current input terminal (pin 2,3,4,5 as in Fig. 2), current output terminal (pin 6,7,8,9 as in Fig. 2), Current Mutual Inductance coil B, rectifier filer T1, sampling resistor R
m, discharge circuit T2, voltage output end (pin 12 as in Fig. 2), power end (pin 14 as in Fig. 2), earth terminal (pin 13 as in Fig. 2) and external reference voltage input end (pin 11 as in Fig. 2).
Current input terminal is connected in series with current output terminal by the primary side of Current Mutual Inductance coil B, current sensor 10 is connected serially to the circuit at air conditioner load 30 place by current input terminal and current output terminal, thus, electric current through air conditioner load 30 will flow through current sensor 10 along the direction in figure shown in arrow, thus current sensor 10 can detect electric current.
The secondary side of Current Mutual Inductance coil B is by rectifier filer T1 and sampling resistor R
mserial connection.Sampling resistor R
mhigh-pressure side (a point as in Fig. 2) be connected to the normal phase input end of discharge circuit T2, sampling resistor R
mlow-pressure side (the b point as in Fig. 2) be connected to the inverting input of discharge circuit T2, the output terminal of discharge circuit T2 is connected to voltage output end.
Discharge circuit T2 can also comprise: reference voltage input (In1REF see in Fig. 3), is connected with external reference voltage input end, for providing reference voltage, wherein, and reference voltage and sampling resistor R
mvoltage contrast, obtain voltage signal.It should be noted that, the voltage that reference voltage provides for chip internal self (such as, 2.5V), pin 11 is external reference voltage input end, generally, uses inner reference voltage, when meeting certain condition, external reference voltage can be accessed, such as, when needing to connect external reference voltage at pin 11 when gathering the electric current lower than 3.6A.
The secondary side of Current Mutual Inductance coil B induces electric current, and this electric current, after T1 rectifying and wave-filtering, is added to sampling resistor R
m, produce pressure drop, by discharge circuit T2, this small voltage signal being amplified, by contrasting with reference voltage, obtaining voltage acquisition signal, thus realize the collection to alternating current.
In the present embodiment, current sensor inside is provided with discharge circuit, can amplify small-signal, thus improves the accuracy detecting the result that small area analysis signal obtains.
Current acquisition mode can have following two kinds:
(1) by unipolarity, electric current is gathered, induce electric current by Current Mutual Inductance coil B, this electric current is added on sampling resistor and produces voltage, and this voltage and reference voltage contrast, output voltage signal, this voltage signal is corresponding with responded to current value.
(2) gathered electric current by bipolarity, the same with the principle of unipolarity acquisition mode, difference is, does not need to carry out voltage-contrast, but the simple pressure difference signal exporting internal sample resistance two ends, then carry out the replacement of current acquisition value.
If external reference voltage input end is connected with reference voltage, can be gathered electric current by unipolarity; If external reference voltage input end does not connect reference voltage, can be gathered electric current by bipolarity.
Preferably, the outside of current sensor 10 can arrange the voltage follower of one-level, is connected to voltage output end.Current sensor inside is gathered signal by difference channel, needs very large loaded impedance, when using bipolarity acquisition mode, needs to use this voltage follower, and adopts unipolarity acquisition mode not need to use voltage follower.
In order to understand technical scheme of the present invention better, below in conjunction with Fig. 3, be described for CKSR6-NP current sensor.
Fig. 3 is the concrete structure schematic diagram of the current sensor of the embodiment of the present invention, and as shown in Figure 3, current sensor is built-in with Current Mutual Inductance coil B, and the electric current obtained by Current Mutual Inductance coil B passes through R
mproduce pressure drop, then by discharge circuit, this small voltage signal is amplified, by contrasting with reference voltage (In1REF), obtaining voltage acquisition signal, being exported by pin 12 (Vout).Concrete, electric current is injected by pin 2,3,4,5, is flowed out by pin 6,7,8,9, induces electric current at the inner secondary side of current sensor.If pin 11 (Vref) has reference voltage, by unipolarity, electric current is gathered, if pin 11 (Vref) does not have reference voltage, by bipolarity, electric current is gathered.Because current sensor inside is gathered by difference, needing very large loaded impedance, therefore, needing when designing peripheral circuit the voltage follow adding upper level.
In the discharge circuit T2 of Fig. 3, the resistance of the resistance of the resistance of R1 can be the resistance of 10k Ω, R2 can be 10k Ω, R3 can be the resistance of 40k Ω, R4 can be 40k Ω, R5 can be 680 Ω.
Preferably, MCU20 can also comprise: analog to digital converter, for the voltage signal of reception is converted to digital signal by simulating signal, is convenient to subsequent calculations.
It should be noted that, in actual applications, above-mentioned air conditioner load current sensing means can make one block of current detecting plate, integrated current detection, data processing, CAN communication function.
The embodiment of the present invention additionally provides a kind of air conditioner load current detecting system, and as shown in Figure 4, this air conditioner load current detecting system comprises: host computer master controller 100, CAN 200 and air conditioner load current sensing means 300.
Wherein, air conditioner load current sensing means 300 is any one the air conditioner load current sensing means described by above-described embodiment.Host computer master controller 100 is connected with air conditioner load current sensing means 300 by CAN 200, the electric current through air conditioner load that host computer master controller 100 is transmitted for being received air conditioner load current sensing means 300 by CAN 200.
Above-mentioned air conditioner load current detecting system, separates current detecting and controller control section, and use CAN transmission data, whole system design simplifies, and transmission side data is just reliable.CAN communication ease for use is comparatively strong, and long transmission distance, makes said system can be applied to multiple occasion easily, such as distant situation.
Host computer master controller 100 can carry multiple air conditioner load current sensing means 300, if air conditioner load current sensing means 300 is integrated into current detecting plate, then host computer master controller 100 can carry multiple current detecting plate (as shown in Figure 5), transmits data by CAN.
Certainly, be more than the preferred embodiment of the present invention.It should be pointed out that for those skilled in the art, under the prerequisite not departing from its general principles, can also make some improvements and modifications, these improvements and modifications are also considered as protection scope of the present invention.
Claims (6)
1. an air conditioner load current sensing means, is characterized in that, comprising: current sensor and micro-control unit MCU,
Wherein, described current sensor is connected serially to the circuit at air conditioner load place, for utilizing mutual inductance phenomenon to induce electric current, being converted to voltage signal, and exporting described voltage signal by responding to the current signal obtained;
Described MCU is connected to the voltage output end of described current sensor, for receiving described voltage signal, and exports the electric current through described air conditioner load calculated according to described voltage signal;
Described MCU comprises: controller local area network's CAN and CAN interface, and described CAN connects CAN by described CAN interface, and utilizes described CAN to transmit the electric current through described air conditioner load calculated.
2. air conditioner load current sensing means according to claim 1, it is characterized in that, described current sensor comprises: current input terminal, current output terminal, Current Mutual Inductance coil, rectifier filer, sampling resistor, discharge circuit, voltage output end, power end, earth terminal and external reference voltage input end;
Wherein, described current input terminal is connected in series with described current output terminal by the primary side of described Current Mutual Inductance coil, and described current sensor is connected serially to the circuit at described air conditioner load place by described current input terminal and described current output terminal;
The secondary side of described Current Mutual Inductance coil is connected in series with described sampling resistor by described rectifier filer;
The high-pressure side of described sampling resistor is connected to the normal phase input end of described discharge circuit, and the low-pressure side of described sampling resistor is connected to the inverting input of described discharge circuit, and the output terminal of described discharge circuit is connected to described voltage output end.
3. air conditioner load current sensing means according to claim 2, it is characterized in that, described discharge circuit comprises: reference voltage input, be connected with described external reference voltage input end, for providing reference voltage, wherein, the voltage of described reference voltage and described sampling resistor contrasts, and obtains described voltage signal.
4. air conditioner load current sensing means according to claim 2, is characterized in that, the voltage follower of the outer setting one-level of described current sensor, is connected to described voltage output end.
5. air conditioner load current sensing means according to any one of claim 1 to 4, is characterized in that, described MCU also comprises: analog to digital converter, for the described voltage signal received is converted to digital signal by simulating signal.
6. an air conditioner load current detecting system, is characterized in that, comprising: host computer master controller, controller local area network's CAN and air conditioner load current sensing means,
Wherein, described air conditioner load current sensing means is the air conditioner load current sensing means according to any one of claim 1 to 5;
Described host computer master controller is connected with described air conditioner load current sensing means by described CAN, and described host computer master controller is used for the electric current through described air conditioner load being received the transmission of described air conditioner load current sensing means by described CAN.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510685658.5A CN105259401A (en) | 2015-10-19 | 2015-10-19 | Air conditioner load current detection device and system |
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| CN201510685658.5A CN105259401A (en) | 2015-10-19 | 2015-10-19 | Air conditioner load current detection device and system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111398652A (en) * | 2019-01-02 | 2020-07-10 | 禾普股份有限公司 | Test device and power test system |
| CN113433839A (en) * | 2021-06-28 | 2021-09-24 | 杭州电子科技大学 | Synchronous rectification Boost converter simulation circuit based on virtual inductor and virtual capacitor |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111398652A (en) * | 2019-01-02 | 2020-07-10 | 禾普股份有限公司 | Test device and power test system |
| CN113433839A (en) * | 2021-06-28 | 2021-09-24 | 杭州电子科技大学 | Synchronous rectification Boost converter simulation circuit based on virtual inductor and virtual capacitor |
| CN113433839B (en) * | 2021-06-28 | 2022-07-01 | 杭州电子科技大学 | Synchronous rectification Boost converter simulation circuit based on virtual inductor and virtual capacitor |
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