CN204227631U - Air-conditioning equipment and circuit board thereof - Google Patents
Air-conditioning equipment and circuit board thereof Download PDFInfo
- Publication number
- CN204227631U CN204227631U CN201420576317.5U CN201420576317U CN204227631U CN 204227631 U CN204227631 U CN 204227631U CN 201420576317 U CN201420576317 U CN 201420576317U CN 204227631 U CN204227631 U CN 204227631U
- Authority
- CN
- China
- Prior art keywords
- sampling resistor
- ipm module
- circuit board
- air
- conditioning equipment
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Landscapes
- Air Conditioning Control Device (AREA)
Abstract
A kind of air-conditioning equipment and circuit board thereof, circuit board comprises substrate, this substrate is provided with for driving an IPM module of compressor, the first sampling resistor of an IPM module work electric current of sampling, Switching Power Supply and make the Master control chip of signal transacting, this first sampling resistor is oppositely arranged with the lower brachium pontis of a described IPM module on described substrate, the first end of this first sampling resistor is connected with the earth terminal of a described IPM module, the low reference voltage end of described lower brachium pontis, the second end ground connection; Described Switching Power Supply is connected with the second end of described first sampling resistor with the earth terminal of described Master control chip.The current sense resistor of unified selection the one IPM module, as total earth point, can make the signal code of whole circuit complete closed-loop path with minimum loop.IPM module, pfc circuit, DC fan modular circuit can be solved, because of earth loop arrange improper cause current sample error large so that cause the inaccurate and master chip erroneous judgement of protection circuit etc. problem.
Description
Technical field
The utility model relates to electronic circuit technology field, particularly relates to a kind of air-conditioning equipment and circuit board thereof.
Background technology
In the electronic apparatus, household appliances of present stage, digital-to-analog circuit is very general, and substantially all electronic products all be unable to do without digital circuit and analog circuit.The frequency of digital circuit is high, such as: data, address, by the Digital Logic such as system.The signal susceptibility of analog circuit is high, such as: audio frequency, sampling, reference power supply etc.Analog signal is easily subject to the interference of data signal, and the one of the main reasons of interference is exactly ground wire.
At present, the operating frequency of convertible frequency air-conditioner, generally at 10Hz-100Hz, belongs to very low frequency.And in low-frequency channel, signalman's working frequency is less than 1MHz, the inductive impact between the wiring of PCB (Printed Circuit Board, printed circuit board) and device is less, and mainly the impact of impedance coupled interference altogether is comparatively large, use single-point grounding.In traditional low-frequency channel, ground connection reference point great majority select the main electrochemical capacitor negative pole being connected on PCB, as earth loop general reference points, but mix forceful electric power, light current, digital and analog circuit in convertible frequency air-conditioner circuit, by the basic cisco unity malfunction of this type of earthing mode.
Utility model content
Based on this, be necessary to provide a kind of circuit board solving the air-conditioning equipment of grounding interference altogether in convertible frequency air-conditioner circuit.
A kind of circuit board of air-conditioning equipment, comprise substrate, this substrate is provided with for driving an IPM module of compressor, the first sampling resistor of an IPM module work electric current of sampling, Switching Power Supply and make the Master control chip of signal transacting, this first sampling resistor is oppositely arranged with the lower brachium pontis of a described IPM module on described substrate, the first end of this first sampling resistor is connected with the earth terminal of a described IPM module, the low reference voltage end of described lower brachium pontis, the second end ground connection; Described Switching Power Supply is connected with the second end of described first sampling resistor with the earth terminal of described Master control chip.
Further, described first sampling resistor is oppositely arranged with the low reference voltage end of the lower brachium pontis of a described IPM module on described substrate.
Preferably, the trace width scope of wire that the first end of described first sampling resistor is connected with the low reference voltage end of the lower brachium pontis of a described IPM module is: 2mm ~ 50mm;
The distance range of the low reference voltage end of the first end of described first sampling resistor and the lower brachium pontis of a described IPM module is: 1mm ~ 50mm.
Further, described substrate is also provided with for driving the 2nd IPM module of Fan Equipment and the second sampling resistor of the 2nd IPM module I PM2 operating current of sampling, the first end of this second sampling resistor is connected with the Voltage Reference end of described 2nd IPM module, and the second end is connected with the earth terminal of described 2nd IPM module I PM2, the second end of described first sampling resistor.
Further, described second sampling resistor is oppositely arranged with the Voltage Reference end of described 2nd IPM module on described substrate.
Preferably, connect that described second sampling resistor is connected with the Voltage Reference end of described 2nd IPM module, the trace width scope of the wire of the second end of described first sampling resistor is: 1.5mm ~ 15mm.
Further, described substrate is also arranged pfc circuit, multiple the 3rd sampling resistor having IGBT pipe operating current in main electrochemical capacitor and sampling pfc circuit;
The first end of the 3rd sampling resistor is connected with the second end of the emitter stage of described IGBT pipe and described first sampling resistor, the negative terminal of the second termination dc source;
The positive pole of described multiple main electrochemical capacitor, negative pole are connected in series the second end of the positive pole to described dc source, described first sampling resistor respectively.
Preferably, the trace width scope connecting the wire at the two ends of described 3rd sampling resistor is: 3mm ~ 30mm.
Preferably, the trace width scope of the wire between the negative pole connecting main electrochemical capacitor described in each is: 2mm ~ 50mm;
The trace width scope connecting the wire of the negative pole of described main electrochemical capacitor and the second end of described first sampling resistor is: 2mm ~ 50mm.
Preferably, the trace width scope of wire that described Switching Power Supply is connected with the second end of described first sampling resistor with the earth terminal of described Master control chip is: 0.5mm ~ 5mm.
In addition, additionally provide a kind of air-conditioning equipment, comprise the circuit board of above-mentioned air-conditioning equipment.
The circuit board of above-mentioned air-conditioning equipment is by passing through the first sampling resistor ground connection by earth terminals such as the big current of circuit board, small area analysis, digital circuit analog circuits, and earth point is selected the signal code of whole circuit can be made to complete closed-loop path with minimum loop at the sampling resistor of an IPM module.Thus, avoid signal reflux long, cause signal imperfect, and then affect current signal sampling inaccurate, protection circuit and master chip erroneous judgement, avoid the long common-impedance coupling that causes of ground wire to disturb, avoid ground wire long cause induction reactance increase affect AC signal loop.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of multiple circuit connected in series type single-point grounding;
Fig. 2 is the schematic diagram of multiple circuit in parallel type single-point grounding;
Fig. 3 is the schematic diagram of the circuit board of air-conditioning equipment in the utility model preferred embodiment;
Fig. 4 is the circuit theory diagrams of circuit board shown in Fig. 3;
Fig. 5 is low resistivity value resistor equivalent circuit diagram.
Detailed description of the invention
In order to make the technical problems to be solved in the utility model, technical scheme and beneficial effect clearly understand, below in conjunction with drawings and Examples, the utility model is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the utility model, and be not used in restriction the utility model.
Refer to Fig. 1 and Fig. 2, single-point grounding is divided into again: tandem type (with reference to figure 1) and parallel connection type (with reference to figure 2).Earth potential in each circuit module of tandem type is different, and form different ground voltages, the earth potential of each circuit can affect by the operating current of each inter-stage, and current potential is very unstable; Although parallel connection type earth connection is more, circuit separate cabling at different levels, avoids the interference produced by common impedance coupling each other.
Refer to Fig. 3 and Fig. 4, the circuit board of air-conditioning equipment in the utility model preferred embodiment, comprising substrate (not shown) can be PCB or FPC (Flexible Printed Circuit Board, flexible PCB), this substrate is provided with for driving an IPM module I PM1 of compressor M, the first sampling resistor R1, the Switching Power Supply T1 of an IPM module I PM1 operating current of sampling and make the Master control chip IC1 of signal transacting.
This first sampling resistor R1 is oppositely arranged with the lower brachium pontis of an IPM module I PM1 on substrate.And on substrate, the first end of this first sampling resistor R1 is connected with the earth terminal of an IPM module I PM1 and the low reference voltage end (NU, NV, NW) of lower brachium pontis (LVIC) by wire, the second end ground connection of this first sampling resistor R1; Switching Power Supply T1 is connected by second end of wire with the first sampling resistor R1 with the earth terminal of Master control chip IC1.In the present embodiment, this wire is the plain conductors such as the Copper Foil be etched on substrate, aluminium foil or silver foil.
Wherein, the first end of the first sampling resistor R1 is connected with the earth terminal GND of an IPM module I PM1 by the first wire 101, by the low reference voltage end (NU, NV, NW) of the second wire 102 with lower brachium pontis.The earth terminal GND2 of Switching Power Supply T1 is connected with second end of the first sampling resistor R1 by privates 103, and the earth terminal GND3 of Master control chip IC1 is connected with second end of the first sampling resistor R1 by privates 104.
Driving compressor general principle is exactly: by the on-off action of the direct current of input the one IPM module I PM1 by switching device, change the three-phase alternating-current supply driving compressor operating into, and flow through the three-phase alternating current that belongs to of the first sampling resistor R1, although the D.C. resistance of the wire on substrate is very little, majority of case can be ignored, but for AC signal, its induction reactance composition just cannot be ignored, the long formation inductive effect of wire, induction reactance is larger, larger on interchange impact, and then affect current sampling circuit, the accuracy that protection circuit and master chip control.
In a preferred embodiment, the first sampling resistor R1 is oppositely arranged with the low reference voltage end of the lower brachium pontis of an IPM module I PM1 on substrate.Particularly, with reference to Fig. 3, the low reference voltage end of the lower brachium pontis of the one IPM module I PM1 comprises U, V, W three-phase low reference voltage end, after these three low reference voltage ends are first connected in series by wire, then be connected with the first end of the first sampling resistor R1 with the shortest wire (the second wire 102).
More specifically, the first end of the first sampling resistor R1 is relative with in the middle of U, V, W three-phase low reference voltage end, then can realize: the Copper Foil that the current sense resistor (the first sampling resistor R1) of an IPM module I PM1 is connected with the lower brachium pontis of an IPM module I PM1 should be short as far as possible, to meet the maximum operating currenbt of an IPM module I PM1.In the present embodiment, require that the distance L scope of the low reference voltage end of the lower brachium pontis of the first end of the first sampling resistor R1 and an IPM module I PM1 (any one in U, V, W three-phase low reference voltage end) is: 1mm ~ 50mm.Preferably, L≤15mm.
Further, the trace width of conductor width is set from the angle of the maximum current meeting wire.The trace width W1 scope of the second wire 102 that the first end of the first sampling resistor R1 is connected with the low reference voltage end of the lower brachium pontis of an IPM module I PM1 is: 2mm ~ 50mm, preferably, W1 is 5mm.The trace width scope of the first wire 101 is: 0.5mm ~ 5mm.
Master control chip IC1 gathers the signal transacting of whole circuit, and the earth loop of Master control chip IC1 with total load for paying the utmost attention to a little, should be drawn separately Copper Foil wire at the earth terminal of digital I/O mouth and being connected to the first resistance.In the present embodiment, the trace width W2 scope of the wire (privates 103 and privates 104) that Switching Power Supply T1 is connected with second end of the first sampling resistor R1 with the earth terminal of Master control chip IC1 is: 0.5mm ~ 5mm.Preferably, W2 is 1mm.
Refer to Fig. 5, for the first sampling resistor R1, parasitic inductances in series impact impact that is comparatively large, parallel parasitic capacitance is less.The three-phase alternating current flowing through the first sampling resistor R1 mainly considers inductive effect when designing wire.In the present embodiment, the resistance span of the first sampling resistor R1 is: 0.01m Ω-10 Ω, preferably, and the first sampling resistor R1 value 8m Ω.
Please continue to refer to Fig. 3 and Fig. 4, substrate being also provided with for driving the 2nd IPM module I PM2 of Fan Equipment DC Fan, second sampling resistor R2, PFC (Power-Factor Corrector, the power factor corrector) circuit of the 2nd IPM module I PM2 operating current of sampling, multiplely having the 3rd sampling resistor R3 of IGBT pipe operating current in main electrochemical capacitor (E1, E2 and E3) and sampling pfc circuit.Pfc circuit comprises PFC chip and IGBT pipe etc.
The first end of the second sampling resistor R2 is connected with the Voltage Reference end (LS1, LS2 and LS3) of the 2nd IPM module I PM2 by the 5th wire 105, second end of the second sampling resistor R2 pass through the 6th wire 106 and the 2nd IPM module I PM2 earth terminal GND4, be connected by second end of the 7th wire 107 with the first sampling resistor R1.In the present embodiment, this wire is the plain conductors such as the Copper Foil be etched on substrate, aluminium foil or silver foil.
In a preferred embodiment, the second sampling resistor R2 is oppositely arranged with the Voltage Reference end (LS1, LS2 and LS3) of the 2nd IPM module I PM2 on substrate.Particularly, refer to Fig. 5, the second sampling resistor R2 drops on three low reference voltage end (LS1, LS2 and LS3) place straight lines of the 2nd IPM module I PM2.
Further, the second sampling resistor R2 is connected with the Voltage Reference end (LS1, LS2 and LS3) of the 2nd IPM module I PM2 the 5th wire 105, the 7th wire 107 trace width W3 scope that is connected with second end of described first sampling resistor R1 are: 1.5mm ~ 15mm.Preferably, W3 is 2mm.In the present embodiment, this wire is the plain conductors such as the Copper Foil be etched on substrate, aluminium foil or silver foil.The wire 106 trace width scope that second sampling resistor R2 is connected with the earth terminal of the 2nd IPM module I PM2 is: 0.5mm ~ 5mm.
The first end of the 3rd sampling resistor R3 is connected with the emitter stage of IGBT pipe and second end of the first sampling resistor R1 by the 8th wire 108, the negative terminal of the second termination dc source BR of the 3rd sampling resistor R3; The colelctor electrode of IGBT pipe is connected with PFC chip, and colelctor electrode is connected with the positive output end of dc source BR.
Further, the trace width W4 scope connecting the 8th wire 108 of the 3rd sampling resistor R3 and the emitter stage of IGBT pipe and second end of the first sampling resistor R1 is: 3mm ~ 30mm.Preferably, W4 is 5mm.In the present embodiment, this wire is the plain conductors such as the Copper Foil be etched on substrate, aluminium foil or silver foil.
Multiple main electrochemical capacitor (E1, E2 and E3) whole convertible frequency air-conditioner main circuit power filtering capacitor, its positive pole is connected in series the positive pole to dc source BR by wire, the live width of walking of this wire is W7, and the negative pole of multiple main electrochemical capacitor (E1, E2 and E3) is connected in series the second end to the first sampling resistor R1 respectively.
Further, the trace width W5 scope of the 9th wire 109 between the negative pole connecting each main electrochemical capacitor (E1, E2 and E3) is: 2mm ~ 50mm; The trace width W6 scope connecting the tenth wire 110 of the negative pole of main electrochemical capacitor and second end of the first sampling resistor R1 is: 2mm ~ 50mm.Preferably W5, W6 are 5mm.In the present embodiment, this wire is the plain conductors such as the Copper Foil be etched on substrate, aluminium foil or silver foil.Trace width W7 can setting identical with W5, W6.
In the present embodiment, on substrate, the first sampling resistor R1, the second sampling resistor R2 and the 3rd sampling resistor R3 are arranged on the same line.
The circuit board of above-mentioned air-conditioning equipment is by inciting somebody to action: compressor circuit, pfc circuit, Switching Power Supply, Master control chip, DC fan circuit etc., all strong and weak electricities, digital and analog circuit, the current sense resistor R1 of unified selection the one IPM module, as total earth point, can make the signal code of whole circuit complete closed-loop path with minimum loop.Thus, avoid signal reflux long, cause signal imperfect, and then affect current signal sampling inaccurate, protection circuit and master chip erroneous judgement, avoid the long common-impedance coupling that causes of ground wire to disturb, avoid ground wire long cause induction reactance increase affect AC signal loop.The common ground impedance coupled interference problem in present stage convertible frequency air-conditioner circuit in each circuit module earth-return circuit can be solved; IPM module, pfc circuit, DC fan modular circuit can be solved, because of earth loop arrange improper cause current sample error large so that cause the inaccurate and master chip erroneous judgement of protection circuit etc. problem.Thus reach equivalent circuitry PCB design, the effect of anti-interference optimum.
In addition, additionally provide a kind of air-conditioning equipment, comprise the circuit board of above-mentioned air-conditioning equipment.
The above embodiment only have expressed several embodiment of the present utility model; not in order to limit the utility model; all do within spirit of the present utility model and principle any amendment, equivalent to replace and improvement etc., all should be included within protection domain of the present utility model.
Claims (11)
1. the circuit board of an air-conditioning equipment, comprise substrate, this substrate is provided with for driving an IPM module of compressor, the first sampling resistor of an IPM module work electric current of sampling, Switching Power Supply and make the Master control chip of signal transacting, it is characterized in that, this first sampling resistor is oppositely arranged with the lower brachium pontis of a described IPM module on described substrate, the first end of this first sampling resistor is connected with the earth terminal of a described IPM module, the low reference voltage end of described lower brachium pontis, the second end ground connection; Described Switching Power Supply is connected with the second end of described first sampling resistor with the earth terminal of described Master control chip.
2. the circuit board of air-conditioning equipment according to claim 1, is characterized in that, described first sampling resistor is oppositely arranged with the low reference voltage end of the lower brachium pontis of a described IPM module on described substrate.
3. the circuit board of air-conditioning equipment according to claim 1 and 2, is characterized in that, the trace width scope of the wire that the first end of described first sampling resistor is connected with the low reference voltage end of the lower brachium pontis of a described IPM module is: 2mm ~ 50mm;
The distance range of the low reference voltage end of the first end of described first sampling resistor and the lower brachium pontis of a described IPM module is: 1mm ~ 50mm.
4. the circuit board of air-conditioning equipment according to claim 1, it is characterized in that, described substrate is also provided with for driving the 2nd IPM module of Fan Equipment and the second sampling resistor of the 2nd IPM module work electric current of sampling, the first end of this second sampling resistor is connected with the pressure reference edge of described 2nd IPM module, and the second end is connected with the earth terminal of described 2nd IPM module, the second end of described first sampling resistor.
5. the circuit board of air-conditioning equipment according to claim 4, is characterized in that, described second sampling resistor R2 is oppositely arranged with the Voltage Reference end of described 2nd IPM module on described substrate.
6. the circuit board of the air-conditioning equipment according to claim 4 or 5, it is characterized in that, connect that described second sampling resistor is connected with the Voltage Reference end of described 2nd IPM module, the second end of described first sampling resistor the trace width scope of wire be: 1.5mm ~ 15mm.
7. the circuit board of air-conditioning equipment according to claim 3, is characterized in that, described substrate is also arranged pfc circuit, multiple the 3rd sampling resistor having IGBT pipe operating current in main electrochemical capacitor and sampling pfc circuit;
The first end of the 3rd sampling resistor is connected with the second end of the emitter stage of described IGBT pipe and described first sampling resistor, the negative terminal of the second termination dc source;
The positive pole of described multiple main electrochemical capacitor, negative pole are connected in series the second end of the positive pole to described dc source, described first sampling resistor respectively.
8. the circuit board of air-conditioning equipment according to claim 7, is characterized in that, the trace width scope connecting the wire at the two ends of described 3rd sampling resistor is: 3mm ~ 30mm.
9. the circuit board of air-conditioning equipment according to claim 7, is characterized in that, the trace width scope of the wire between the negative pole connecting main electrochemical capacitor described in each is: 2mm ~ 50mm;
The trace width scope connecting the wire of the negative pole of described main electrochemical capacitor and the second end of described first sampling resistor is: 2mm ~ 50mm.
10. the circuit board of air-conditioning equipment according to claim 3, is characterized in that, described Switching Power Supply with the trace width scope of the wire that the earth terminal of described Master control chip is connected with the second end of described first sampling resistor is: 0.5mm ~ 5mm.
11. 1 kinds of air-conditioning equipments, is characterized in that, comprise the circuit board of the air-conditioning equipment described in any one of claim 1 to 10.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420576317.5U CN204227631U (en) | 2014-09-30 | 2014-09-30 | Air-conditioning equipment and circuit board thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420576317.5U CN204227631U (en) | 2014-09-30 | 2014-09-30 | Air-conditioning equipment and circuit board thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204227631U true CN204227631U (en) | 2015-03-25 |
Family
ID=52925717
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420576317.5U Active CN204227631U (en) | 2014-09-30 | 2014-09-30 | Air-conditioning equipment and circuit board thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204227631U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104279703A (en) * | 2014-09-30 | 2015-01-14 | 广东美的制冷设备有限公司 | Air conditioner and circuit board thereof |
| CN107477814A (en) * | 2017-09-27 | 2017-12-15 | 广东美的暖通设备有限公司 | Controller and air-conditioning for air-conditioning |
-
2014
- 2014-09-30 CN CN201420576317.5U patent/CN204227631U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104279703A (en) * | 2014-09-30 | 2015-01-14 | 广东美的制冷设备有限公司 | Air conditioner and circuit board thereof |
| CN107477814A (en) * | 2017-09-27 | 2017-12-15 | 广东美的暖通设备有限公司 | Controller and air-conditioning for air-conditioning |
| CN107477814B (en) * | 2017-09-27 | 2019-09-20 | 广东美的暖通设备有限公司 | Controller and air-conditioning for air-conditioning |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104279703B (en) | Air-conditioning equipment and its circuit board | |
| CN102882386B (en) | A kind of AC/DC converting means and control method thereof | |
| CN102204078B (en) | Interconnection inverter | |
| CN103545305B (en) | A kind of power model | |
| CN206099366U (en) | Ambipolar photovoltaic power generation system | |
| CN206294085U (en) | The arrangement of metal-oxide-semiconductor in new-energy automobile power driver module | |
| CN103944375A (en) | PFC control circuit and PFC circuit with same used | |
| CN204227631U (en) | Air-conditioning equipment and circuit board thereof | |
| CN103630128B (en) | Circuit of single transformer for realizing luminance building-up and maintaining functions of laser gyroscope high-voltage power supply | |
| CN205910520U (en) | Power control chip and be provided with electronic equipment of this chip | |
| CN104283537A (en) | Power semiconductor circuit | |
| CN206164193U (en) | ACDC switching circuit of supplying power | |
| CN200959570Y (en) | Large-power driving circuit with current sampler | |
| CN210693765U (en) | IGBT parallel drive adapter circuit and circuit board | |
| CN208862634U (en) | A kind of power supply switching power supply circuit | |
| CN103902009A (en) | Discharge circuit | |
| CN206850664U (en) | Switching Power Supply and current transformer for current transformer | |
| CN106533218A (en) | Three-phase rectifying circuit and driving control method | |
| CN208128136U (en) | A kind of boost module | |
| CN204693726U (en) | Air-conditioning equipment and circuit board thereof | |
| CN206402098U (en) | A kind of current rectifying and wave filtering circuit | |
| CN205791526U (en) | A kind of parallel connection type hybrid passive filtering compensation device | |
| CN205248906U (en) | High -power supply voltage circuit that does not cut off power supply | |
| CN110601510A (en) | IGBT parallel drive adapter circuit and circuit board | |
| CN106208773A (en) | A kind of converter topology |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |