CN2387667Y - D. C. brushless fan for indoor machine of air conditioner - Google Patents
D. C. brushless fan for indoor machine of air conditioner Download PDFInfo
- Publication number
- CN2387667Y CN2387667Y CN99222286U CN99222286U CN2387667Y CN 2387667 Y CN2387667 Y CN 2387667Y CN 99222286 U CN99222286 U CN 99222286U CN 99222286 U CN99222286 U CN 99222286U CN 2387667 Y CN2387667 Y CN 2387667Y
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- blower fan
- pin
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- resistance
- brush
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Abstract
The utility model relates to a direct current brushless fan for an indoor machine of an air conditioner. The common end of an inverter circuit is connected with the ADCIN end of a microcontroller through an operational amplification circuit. A hall sensor circuit and a corresponding signal processing circuit can be omitted through improving the circuit and can be simply replaced by a plurality of resistors and capacitances. The manufacturing cost is reduced, and therefore, the utility model can get price superiority.
Description
The utility model belongs to air conditioner room unit, is specifically related to the control device in the brush DC blower fan of air conditioner room unit.
Before the utility model is made, be that the blower fan of interior machine mainly contains following several both at home and abroad in the air-conditioning product: the brush DC blower fan and the brushless blower fan of conventional DC (being the brush DC blower fan of position sensorless device) of single-phase tap blower fan, PG blower fan, band Hall element.The shortcoming of tapped blower fan is can not stepless speed regulation; PG fan speed regulation narrow range, and heating is serious, efficient is low; The brush DC fan performance of band Hall element is better, but price is more expensive; The brushless blower fan of conventional DC is controlled difficulty, but cheap and performance good.The hardware components of plain edition brush DC blower fan Driving technique as shown in Figure 1.Because the brush DC blower fan is a kind of ac synchronous motor in essence, rotor is the rare earth permanent magnet formula, and the rotor field formula is trapezoidal.Drive this brush DC blower fan, must have rotor position information to be input to MCU (microcontroller), MCU just can know when should commutate to inverter like this.Fig. 1 has more clearly expressed the drive scheme of traditional brush DC blower fan based on Hall element.It mainly is to send eight or sixteen bit micro controller I/O mouth to after handling through sensor signal processing circuit by the signal that Hall element spreads out of; Simultaneously the over-current signal of inverter circuit is sent to the A/D gateway of eight or sixteen bit microcontroller after by the over-current detection processing circuit processes, these circuit are more common schemes on some scientific and technological books and periodicals.
The purpose of this utility model provides a kind of blower fan feedback signal and does not adopt Hall element circuit and corresponding signal processing circuit, directly is connected brush DC blower fan in the indoor apparatus of air conditioner on the microprocessor.
For the utility model that achieves the above object is to realize like this, brush DC blower fan in a kind of indoor apparatus of air conditioner, it is to connect blower fan by control device to constitute, wherein control device comprises microcontroller, microcontroller connects pre-process circuit, pre-process circuit connects inverter circuit, and inverter circuit connects the brush DC blower fan, and the blower fan three terminal lines in the brush DC blower fan connect microcontroller by bleeder circuit; The common port of described inverter circuit is by 3 pin of resistance concatenation operation amplifier, pass through grounding through resistance simultaneously, 2 pin of this operational amplifier pass through grounding through resistance, 2 pin of this operational amplifier also connect its 1 pin by resistance, 1 pin of this operational amplifier is connected with diode+the 5V power supply by resistance, and 1 pin of this operational amplifier connects the ADCIN end of microcontroller by resistance.
Advantage of the present utility model and good effect are, present air conditioner is because market competition is fierce day by day, improvement by such circuit can be omitted Hall element circuit and corresponding signal processing circuit, simply substitute with several resistance and electric capacity, on manufacturing cost, reduce like this, so can obtain price advantage.
Below in conjunction with accompanying drawing the utility model is described in further detail.
Fig. 1 is that the utility model is made former circuit block diagram;
Fig. 2 is the circuit diagram of an embodiment of the utility model;
Fig. 3 is an embodiment blower fan of a utility model map of current.
As shown in Figure 2, brush DC blower fan in a kind of indoor apparatus of air conditioner, it is to connect blower fan by control device to constitute, wherein control device comprises microcontroller 1, microcontroller 1 connects pre-process circuit 2, pre-process circuit 2 connects inverter circuit 3, and inverter circuit 3 connects brush DC blower fan 4, and the blower fan three terminal lines in the brush DC blower fan connect microcontroller 1 by bleeder circuit; The common port of inverter circuit 3 is by 3 pin of 1.2K resistance R 8 concatenation operation amplifiers 5, simultaneously by 0.22K resistance R 7 ground connection, 2 pin of this operational amplifier 5 are by 10K resistance R 9 ground connection, 2 pin of this operational amplifier 5 also connect its 1 pin by 100K resistance R 10,1 pin of this operational amplifier 5 is connected+the 5V power supply with IN4148 diode D1 by 330K resistance R 11, and 1 pin of this operational amplifier 5 is held 32 pin by the ADCIN that resistance R 11 connects microcontroller 1.Notice that the parameter among Fig. 2 obtains under the following conditions: motor: rated power 23w, operation DC voltage≤36V
Single phase winding resistance R=3.4 Ω inductance L=6.12mH
Rated current 1A, maximum current 2A.Part in the empty frame is the hardware components of application protection, also is and the conventional method difference.In addition, notice that loop feedback signal arrives the AD conversion input port of MCU (or DSP).Other parts hardware circuit among Fig. 2, for example pre-driver and inverter do not describe in detail, because different with traditional scheme.The mentality of designing of software
As seen from Figure 2, this programme has been gathered three road analog voltage signals from the blower fan end line, is input to the AD ALT-CH alternate channel of MCU (or DSP) after electric resistance partial pressure and filtering, carries out analog-to-digital conversion, makes MCU (or DSP) obtain the instantaneous value of each phase voltage.In addition; Current sampling resistor R7 becomes voltage with electric current, and the analog signal after LM358 amplifies 10 times is also imported the AD mouth, and like this, MCU (or DSP) obtained the to flow through current value of fan coil is to carry out overcurrent protection.MCU (or DSP) is described in detail in detail below how knows the moment that inverter commutates by computing.
In stator coil, have only two-phase to alive simultaneously, and biphase current is the anti-phase the 3rd to be zero mutually.Like this, three stator current sums are zero.Among Fig. 3, Un is a neutral point voltage; Ek is a back electromotive force; R1, L are respectively the resistance value and the inductance value of single-phase stator coil.Uk=ikR+Ldik/dt+Ek+Un is k=1 wherein, 2, so 3U1=i1R+Ldi1/dt+E1+UnU2=i2R+Ldi2/dt+E2+UnU3=i3R+Ldi3/dt+ E3+Un is so have U1+U2+U3=3Un because i1+i2+i3=0 simultaneously because the back electromotive force sum of dc brushless motor is zero (see figure 4) at any time, has the non-energising phase-1/3 of the non-energising phase-Un=U of the non-energising phase=U of following formula: E ∑ for non-energising phase (zero current phase)
1 K=1,2,3So Uk and since the right each the amount all can obtain by the AD conversion value, so can calculate the instantaneous value of the non-energising phase of E, also just can know certainly it when zero passage.Like this, postponing 30 degree electrical degree places at zero crossing is exactly the moment points for attention of commutation:
This programme requires the processing speed of MCU (or DSP) to want fast, and single command cycle should be greater than 100 μ s; And inside is integrated with PWM generation mechanism (6 tunnel bilateral PWM pattern); Have six road ADC ALT-CH alternate channels at least (for guaranteeing that two temperature sensor inputs of indoor apparatus of air conditioner should be less than 10 μ s.The MCU of this programme (or DSP) is proper with the TMS320F241 of TIX (TI).
To the brush DC blower fan of different parameters, the resistance capacitance parameter should be done suitable adjustment.
Claims (1)
1. brush DC blower fan in the indoor apparatus of air conditioner, it is to connect blower fan by control device to constitute, wherein control device comprises microcontroller (1), microcontroller (1) connects pre-process circuit (2), pre-process circuit (2) connects inverter circuit (3), inverter circuit (3) connects brush DC blower fan (4), and the blower fan three terminal lines in the brush DC blower fan connect microcontroller (1) by bleeder circuit; It is characterized in that: the common port of described inverter circuit (3) is by 3 pin of resistance (R8) concatenation operation amplifier (5), simultaneously by resistance (R7) ground connection, 2 pin of this operational amplifier (5) are by resistance (R9) ground connection, 2 pin of this operational amplifier (5) also connect its 1 pin by resistance (R10), 1 pin of this operational amplifier (5) is connected+the 5V power supply with diode (D1) by resistance (R11), and 1 pin of this operational amplifier (5) connects the ADCIN end (32 pin) of microcontroller (1) by resistance (R11).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN99222286U CN2387667Y (en) | 1999-09-09 | 1999-09-09 | D. C. brushless fan for indoor machine of air conditioner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN99222286U CN2387667Y (en) | 1999-09-09 | 1999-09-09 | D. C. brushless fan for indoor machine of air conditioner |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2387667Y true CN2387667Y (en) | 2000-07-12 |
Family
ID=34012699
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN99222286U Expired - Fee Related CN2387667Y (en) | 1999-09-09 | 1999-09-09 | D. C. brushless fan for indoor machine of air conditioner |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2387667Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102522932A (en) * | 2011-11-30 | 2012-06-27 | 四川长虹电器股份有限公司 | Direct-current brushless motor system of air conditioner and rotating speed control method of direct-current brushless motor system |
-
1999
- 1999-09-09 CN CN99222286U patent/CN2387667Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102522932A (en) * | 2011-11-30 | 2012-06-27 | 四川长虹电器股份有限公司 | Direct-current brushless motor system of air conditioner and rotating speed control method of direct-current brushless motor system |
| CN102522932B (en) * | 2011-11-30 | 2015-08-19 | 四川长虹电器股份有限公司 | Direct-current brushless motor system of air conditioner and method for controlling number of revolution thereof |
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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 |