CN207556448U - A kind of capacitance coagulates the shielding construction of frost detection - Google Patents
A kind of capacitance coagulates the shielding construction of frost detection Download PDFInfo
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- CN207556448U CN207556448U CN201721137638.5U CN201721137638U CN207556448U CN 207556448 U CN207556448 U CN 207556448U CN 201721137638 U CN201721137638 U CN 201721137638U CN 207556448 U CN207556448 U CN 207556448U
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Abstract
The utility model discloses the shielding constructions that a kind of capacitance coagulates frost detection, the shielding construction includes capacitance analog-digital converter, capacity plate antenna, the capacitance analog-digital converter, capacity plate antenna may be contained on pcb board, on pcb board, since the position of capacitance analog-digital converter, capacity plate antenna positive lead is introduced into PCB shielding constructions, the PCB slab constructions are at least extended to capacity plate antenna.The utility model coagulates white detection device for condenser type and proposes improved method, capacitance type sensor can be effectively reduced to be influenced by external environment, detection stability and sensitivity are improved, and does not need to change original structure, it is only necessary to this scheme is used when designing sensor.
Description
Technical field
The utility model belongs to technical field of refrigeration equipment, and the condenser type of more particularly to refrigeration equipment is coagulated under white detection mode
Capacity plate antenna shielding construction.
Background technology
In the application of refrigerator, for carrying out the evaporator of refrigeration heat exchange, surface temperature is subzero, when in air
There are during steam, it is easy to form solidifying frost attachment on an evaporator.After frosting on evaporator, refrigerating efficiency can be seriously affected,
Refrigeration for refrigerator effect is caused to be deteriorated, while power consumption increases.Therefore be born the various methods for detecting and frost thickness being coagulated in refrigerators.
The typical mode of one of which is condenser type, the solidifying frost detection dress as disclosed in patent application 201611046700.X
It puts, which includes：Evaporator, detection plate condenser, reference plate capacitor and chromacoder, detection tablet electricity
Container, reference plate capacitor at least have there are two the opposite conductive plate being placed in parallel, and evaporation tube is physically contacted, and signal turns
Changing device is electrically connected to detection plate condenser and reference plate capacitor, by detection plate condenser and reference plate capacitance
The capacitance of device is converted into digital signal.The value of current digital signal, i.e., it is corresponding when the thickness that frost is coagulated in front evaporation tube.
But it is found during practice the disadvantage is that, the accuracy of the solidifying frost thickness, is highly susceptible to outer
The influence of boundary's environment, result has relatively large deviation in actually measuring, because in the connection of chromacoder and plate condenser
On can introduce parasitic capacitance, when refrigerator is during solidifying frost, since vapor exists, capacity plate antenna that can be in sensor and company
Water outlet is condensed in wiring, and the dielectric constant of 10 degrees Celsius of water droplets is 83.95, the dielectric constant of air is 1, about differs 84 times,
Capacitance C=ε the * S/D, wherein ε of plate condenser are the dielectric constant of substance, and S is the overlapping of two pole plates of plate condenser
Area, D are the distance between two pole plates, when larger unusual fluctuations occurs in ε, are equivalent to capacitance detecting and large error occur,
So larger noise can occur in detection process in relative capacitance, Stability and veracity is very undesirable.
Invention content
Based on this, therefore the primary mesh of the utility model be to provide a kind of capacitance coagulate frost detection shielding construction, the screen
Shield structure improves condenser type and coagulates the stability of white detection sensor and sensitive on the basis of the structure of raw sensor is not changed
Degree effectively reduces the error that the variation of measurement process external environment is brought, sensor is enable more accurately to measure frost thickness,
And measurement data is more stablized.
Another mesh of the utility model it is to provide the shielding construction that a kind of capacitance coagulates frost detection, the shielding construction structure
It makes simple, it is easy to accomplish, and can be adapted for the occasion of a variety of PCB shieldings, after the variation of various varying environments, it is ensured that sensing
Device is by being influenced minimum.
To achieve the above object, the technical solution of the utility model is：
A kind of capacitance coagulates the shielding construction of frost detection, which includes capacitance analog-digital converter, capacity plate antenna, institute
State capacitance analog-digital converter, capacity plate antenna may be contained on pcb board, it is characterised in that on pcb board, from capacitance analog-to-digital conversion
The position of device starts, and capacity plate antenna positive lead is introduced PCB shielding constructions, the PCB slab constructions are at least extended to flat
Plate capacitance.
Specifically, using pcb board wiring as connection mode, then in PCB layout, positive lead both sides use
Copper is covered, connecting line both sides are fully wrapped around firmly；Meanwhile at the pcb board back side, using copper is covered, positive lead is completely covered.
Due to adding in anode transmission line both sides and behind shielding construction, when there is water droplet on positive lead access
When, influence of the water to anode transmission line with shielding construction is synchronous, so microcontroller can then acquire anode simultaneously in processing
Then the signal of transmission line signals and shielding construction filters out influence of the water to parasitic capacitance according to signal characteristic.
Further, the PCB shielding constructions are shielded layer, and the capacity plate antenna includes ground pole piece and positive plate, and earth polar connects
Extension bar and anode connecting rod, comprising positive lead wherein in anode connecting rod, the both sides and the back side of the positive lead are set
It is equipped with shielded layer.
Further, the shielded layer is coated on the positive lead, and extends to what capacity plate antenna was connected
Capacitance analog-digital converter.
The utility model coagulates white detection device for condenser type and proposes improved method, can effectively reduce capacitive sensing
Device is influenced by external environment, improves detection stability and sensitivity, and does not need to change original structure, it is only necessary to designed
This scheme is used during sensor.And the program can be adapted for the occasion of a variety of PCB shieldings, become in various varying environments
After change, it is ensured that sensor is by being influenced minimum.
Description of the drawings
Fig. 1 is that the utility model is implemented on the structure diagram that condenser type coagulates white detection device.
Fig. 2 is that the utility model is implemented to apply the application schematic diagram of shielding construction on pcb board.
Specific embodiment
In order to make the purpose of the utility model, technical solutions and advantages more clearly understood, below in conjunction with attached drawing and implementation
Example, the present invention is further described in detail.It should be appreciated that specific embodiment described herein is only used to explain
The utility model is not used to limit the utility model.
Shown in Fig. 1, the structure diagram realized by the utility model coagulates the typical knot of frost detection shown in figure for condenser type
Structure, comprising plate condenser 200, chromacoder 201 (i.e. capacitance analog-digital converter), capacity plate antenna earth polar connecting rod 100,
Capacity plate antenna anode connecting rod 101.
Wherein capacity plate antenna 200 includes ground pole piece 202 and positive plate 203, such as schemes comprising 4 pole piece and 3 positive plates；
Wherein earth polar connecting rod 100 includes earth polar connecting line 103；Positive lead 104, anode are included wherein in anode connecting rod 101
The both sides and the back side of connecting line 104 are provided with shielded layer 105.
As shown in Fig. 2, for PCB layout shielding connection embodiment.As shown in the figure, capacitance cathode connecting line 104 can be with the earth
A parasitic capacitance is generated, so capacity plate antenna size is equivalent to the sum of capacity plate antenna and parasitic capacitance.It is resulted from when there is ponding
When in connecting rod 101, then parasitic capacitance medium is water by air variation, and the dielectric constant of 10 DEG C waters is 83.95, air
Dielectric constant for 1, about differ 84 times, so when this variation generates, very big influence generated on the size of parasitic capacitance, because
This produces a very large impact total capacity plate antenna, therefore deviation occurs in the accuracy detected, meanwhile, also there is deviation in stability.And
Because there is shielded layer 105 to exist after improvement, water also generates shielded layer same affect, and microcontroller is in processing voltage signal
When, because shielded layer 105 and positive lead 104 have identical signal intensity, therefore can be handled with software by noise filtering.
So the capacitance variations of capacity plate antenna are influenced to be much less by connecting line parasitic capacitance, monitoring signals are also more stablized, inspection
Survey sensitivity higher.
Therefore, the utility model coagulates white detection device for condenser type and proposes improved method, can effectively reduce capacitance
Formula sensor is influenced by external environment, improves detection stability and sensitivity, and does not need to change original structure, it is only necessary to
This scheme is used when designing sensor.And the program can be adapted for the occasion of a variety of PCB shieldings, in various differences
After environmental change, it is ensured that sensor is by being influenced minimum.
The above is only the preferred embodiment of the utility model only, is not intended to limit the utility model, all at this
All any modification, equivalent and improvement made within the spirit and principle of utility model etc., should be included in the utility model
Protection domain within.
Claims (4)
1. a kind of capacitance coagulates the shielding construction of frost detection, which includes capacitance analog-digital converter, capacity plate antenna, described
Capacitance analog-digital converter, capacity plate antenna may be contained on pcb board, it is characterised in that on pcb board, from capacitance analog-digital converter
Position starts, and capacity plate antenna positive lead is introduced PCB shielding constructions, the PCB slab constructions are at least extended to tablet electricity
Hold.
2. capacitance as described in claim 1 coagulates the shielding construction of frost detection, it is characterised in that using pcb board wiring as connection
Mode, in PCB layout, positive lead both sides, using covering copper, by connecting line both sides it is fully wrapped around live；Meanwhile in pcb board
Using copper is covered, positive lead is completely covered for the back side.
3. capacitance as claimed in claim 2 coagulates the shielding construction of frost detection, it is characterised in that the PCB shielding constructions are shielding
Layer, the capacity plate antenna include ground pole piece and positive plate, earth polar connecting rod and anode connecting rod, are wherein included in anode connecting rod
Positive lead, the both sides and the back side of the positive lead are provided with shielded layer.
4. capacitance as claimed in claim 3 coagulates the shielding construction of frost detection, it is characterised in that the shielded layer is coated on described
Positive lead, and extend to the capacitance analog-digital converter that capacity plate antenna is connected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721137638.5U CN207556448U (en) | 2017-09-06 | 2017-09-06 | A kind of capacitance coagulates the shielding construction of frost detection |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201721137638.5U CN207556448U (en) | 2017-09-06 | 2017-09-06 | A kind of capacitance coagulates the shielding construction of frost detection |
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| CN207556448U true CN207556448U (en) | 2018-06-29 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107576257A (en) * | 2017-09-06 | 2018-01-12 | 芯海科技（深圳）股份有限公司 | A kind of shielding construction of the solidifying frost detection of electric capacity |
-
2017
- 2017-09-06 CN CN201721137638.5U patent/CN207556448U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107576257A (en) * | 2017-09-06 | 2018-01-12 | 芯海科技（深圳）股份有限公司 | A kind of shielding construction of the solidifying frost detection of electric capacity |
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