CN203130573U - Electrodeless speed regulating system of automobile air conditioner air blower - Google Patents

Abstract

The utility model discloses an electrodeless speed regulating system of an automobile air conditioner air blower. The electrodeless speed regulating system of the automobile air conditioner air blower comprises a air blower and a speed regulating switch, the speed regulating system further comprises an electrodeless speed regulating module, the speed regulating switch is connected with the electrodeless speed regulating module, and the electrodeless speed regulating module is connected with the air blower. The electrodeless speed regulating module is arranged in the system and is provided with a heat radiating component, the electrodeless speed regulating module achieves the function of electrodeless speed regulating, and the electrodeless speed regulating system of the automobile air conditioner air blower has the advantages of protecting overcurrent, being obvious in heat radiating effect, and low in energy consumption, and is efficient and energy-saving, strong in anti-electromagnetic interference capacity, stable in product quality, and high in reliability.

Description

Blower for vehicle air conditioning stepless time adjustment system

Technical field

The utility model relates to a kind of speed control system, and in particular, the utility model relates generally to a kind of blower for vehicle air conditioning stepless time adjustment system.

Background technique

The car air-conditioning system be realize that indoor air freezes to driving, the device of heating, ventilation and air purification.At present, blower speed governing in the conventional car air conditioner, great majority all are to come speed governing by the mode of crosstalk resistance, utilize in the electric motor loop size of resistance to come regulating voltage, reach the purpose of adjusting rotation speed of fan.The resistance of low gear bit string is big, and the resistance of middle gear string is little, and high gear is not gone here and there resistance.Though this mode is simple in structure, the component cost is also low, and is easy to maintenance, and quite a few power consumes in vain on resistance during blower fan work, and the speed adjusting resistance heating value is very big, needs heat radiation in time.If heat radiation is untimely, easily cause self-burning of vehicle.For timely heat radiation, speed adjusting resistance is placed on the exhaust outlet of warm-air drier usually, utilizes warm-air drier to speed adjusting resistance blowing heat radiation.Warm-air drier is normally dried, and the temperature of speed adjusting resistance will be stabilized in the comparatively safe scope.If the warm braw motor breaks down, because reasons such as motor rotation blockage, fan blade come off, motor short circuit cause not air-out, then the temperature of speed adjusting resistance will rise rapidly, and working of plastics that finally may be on every side etc. ignites.

Speed adjusting module is adopted in the blower speed governing more in the novel car air conditioner, produce pwm signal control power field effect pipe by microcomputer and come speed governing, this speed regulating method has that the switching frequency high, low speed is stable, dynamic performance is good, the efficient advantages of higher, is easy to realize in single-chip computer control system.In the present automobile air conditioner control system both domestic and external, the design of ECU (Electrical Control Unit) is not nearly all considered the problem of low power consumption.In fact, throughout the year, driver is limited to the use of air-conditioning, but after automobile one igniting, conditioning control unit is start just, and regardless of using or not using air-conditioning all can consume a part of electric energy in vain, this and the world today advocate " energy-conserving and environment-protective " and disagree in the process of whole driving.

The model utility content

Consider the problems referred to above of prior art, according to the disclosed aspect of the utility model, the utility model is by the following technical solutions: a kind of blower for vehicle air conditioning stepless time adjustment system, comprise blower and speed control switch, described speed control system also comprises the stepless time adjustment module, speed control switch is connected with the stepless time adjustment module, and the stepless time adjustment module connects blower again.

Further technological scheme is: described stepless time adjustment module comprises power supply unit of voltage regulation, driver element, input processing unit, control unit and over-current protecting unit, the power supply of power supply unit of voltage regulation after with step-down passes to the control unit that is attached thereto, the input end of input processing unit connects power supply unit of voltage regulation, output terminal connects control unit, driver element one end is connected with control unit, the other end is connected with over-current protecting unit, and over-current protecting unit is connected with blower again;

Further technological scheme is: the described heat-dissipating part of being made up of Heat sink that also is provided with on the stepless time adjustment module;

Further technological scheme is: the described driver element of institute and over-current protecting unit all are provided with switching circuit, carry out switch control by control unit;

Compared with prior art, one of the beneficial effects of the utility model are: the utility model adopts and designed the stepless time adjustment module in system, in addition module is provided with heat-dissipating part; this module realizes function of stepless speed regulation; have overcurrent protection, radiating effect is obvious, low in power consumption.Energy-efficient, anti-electromagnetic interference capability is strong, constant product quality, reliability height.

Description of drawings

Fig. 1 is the utility model structural representation;

Fig. 2 is the utility model stepless time adjustment modular unit component diagram;

Fig. 3 is the utility model circuit diagram.

Embodiment

Below in conjunction with accompanying drawing the utility model is further elaborated.

Consider the problems referred to above of prior art, according to the disclosed aspect of the utility model, the utility model is by the following technical solutions: as shown in Figure 1, a kind of blower for vehicle air conditioning stepless time adjustment system, comprise blower 103 and speed control switch 102, speed control system also comprises stepless time adjustment module 101, and speed control switch 102 is connected with stepless time adjustment module 101, according to present embodiment, for example connect by lead or connect by intergrated circuit; Stepless time adjustment module 101 connects blower 103 again, and system mainly is made up of blower stepless speed regulation module 101, speed control switch 102, blower 103 etc., selects the air quantity gear by speed control switch 102, and speed adjusting module 101 changes air quantity accordingly.The basic ideas of this blower for vehicle air conditioning stepless speed regulation module 101 are: adopt the fixed frequency modulated PWM method to make single-chip microcomputer produce the pwm signal of 17.8KHz ± 1KHz, drive the MOSFET main switch element of 2 parallel connections through overdrive circuit, change the average voltage at blower armature two ends with the mode by the change dutycycle, thereby reach the purpose of speed governing.For realizing overcurrent protection; grounding end at main switch element seals in the sample resistance silk; utilize the electric current of series connection to equate principle, after the amplification of sampling current small-signal by the over-current protection circuit that is made of operational amplifier, the comparison, single-chip microcomputer just can detect the current situation by main switch element.In time dispel the heat for making main switch element and responding diode fast, a radiator is installed, make its held against heat sink by the screw connection, reach the heat radiation purpose.But the modes such as single-chip microcomputer that the design of low power consumption then is selection, controllable electric power and the software timing by power supply chip wakes standby up realize.

According to another preferred embodiment of the present utility model; as shown in Figure 2; described stepless time adjustment module 101 comprises power supply unit of voltage regulation 201; driver element 204; input processing unit 202; control unit 203 and over-current protecting unit 205; power supply unit of voltage regulation 201 passes to the power supply after the step-down control unit 203 that is attached thereto; the input end of input processing unit 202 connects power supply unit of voltage regulation; output terminal connects control unit 203; driver element 204 1 ends are connected with control unit 203; the other end is connected with over-current protecting unit 205, and over-current protecting unit 205 is connected with blower 103 again.

Power supply requirement two-stage in the power supply unit of voltage regulation 201, module, one-level is the drive circuit power supply, requires 12V.Another grade is the 5V power supply that single-chip microcomputer and input circlult etc. require.Owing to will consider the abominable situation of low power consumption and automobile power source, elementary voltage stabilizing is to the power supply chip selector switch type Voltage stabilizing module of 12V, LM2575T-12.0, to realize the low power consumption output under the high input voltage, external reference diode V3, inductance L 2 and filter capacitor C7, C6, C8 just constitute mu balanced circuit.The NCV4274ADS50R4G of the power supply chip selection ON company of 5V is arrived in secondary voltage stabilizing, the every 1mA load of this device power consumption: 150uA, and have the function of overcurrent, overvoltage, overheat protector, peripheral components is few.For guaranteeing that single-chip microcomputer has good power environment, avoid interference, also add transient voltage suppressor V4 at the output terminal of 5V power supply, even there is interference also can eliminate.

Input processing unit 202, input processing circuit is made up of resistance R 1, R2, capacitor C 1 and diode V1, V2, realize the collection of switching signal, blower speed control switch inside is variable resistor, and the R2 in this input circlult enough becomes bleeder circuit with it, and the air quantity shift transformation is become voltage signal, R1, C1 are the RC eliminator, V1, the V2 volt circuit that is limited prevents that too high peak voltage from entering 2 pin of single-chip microcomputer, its band AD mouth.Single-chip microcomputer just can have been judged the variation of speed control switch gear after finishing the AD conversion.Certainly, for the reliability of sampling, the software filtering method of averaging for N time of taking on the software to sample is eliminated error.

Control unit 203, control unit 203 uses single-chip microcomputers, and single-chip microcomputer is selected FREESCALE single-chip microcomputer MC68HC908 series, and its performance is good, function is strong, speed is high, be 8 very high 8-digit microcontrollers of cost performance.Have security protection feature, comprise that the house dog supervision resets, the detection of the low voltage limit resets, the disable instruction detection resets and the illegal address inspection resets.Consider that this speed adjusting module realizes that function only needs 6 I/O mouth pins, select to have the single-chip microcomputer MC68HC908QT2 of 8 pins, because it can use internal oscillator circuit, need not external crystal oscillation circuit, improve reliable type greatly.The QT2 single-chip microcomputer is power consumption 6mA when operating mode, and power consumption 1mA during standby mode utilizes this characteristic, but power saving.Concrete grammar is, when software designs, under the situation that needs blower work, allows single-chip microcomputer be in operating mode, other the time then be in standby mode.Implementation method is to utilize the method for timing wake-up, a timer of programming monolithic processor inside; 10mS interrupts once; whether 0.1S had regularly both judged in interrupt routine to 10 times and had interrupted, if be less than; after returning, interruption keeps standby mode; if arrive, detect the gear whether speed control switch is once arranged and change (what in fact detect is the size of voltage), if do not have; enter standby mode, turn off the power supply of drive circuit and over-current protection circuit simultaneously.If have, withdraw from standby mode, enter operating mode, open the power supply of drive circuit and over-current protection circuit simultaneously.Like this, speed adjusting module is in spare time, and 95% time all is in standby mode, reaches purpose of power saving.

Driver element 204, drive circuit drives Si Mite reverser HEF40106BT by switching circuit (resistance R 5, R6, R7 and triode Q1), and there are 6 reversers its inside, adopts driving mode in parallel, and driving force is strong like this, and the PWM waveform is complete.Drive the field effect transistor IRF540N of two parallel connections at last.Why using two, is in order to reduce the internal resistance of pipe, to reduce heating value.And general domestic supporting merchant, is return but such result is three a large amount of parcel posts often only with one in order to reduce cost.Also has a response diode V7(MUR1560 fast in the circuit); its effect is the inverse electromotive force of eliminating motor; the protection field effect transistor can not punctured by too high inverse electromotive force; because continuous firing; it also can produce higher heat; the effect of capacitor C 8 is in order to make pwm signal level and smooth, to prevent from producing when high-low level from changing peak voltage.Certainly, these measures also are not enough to guarantee the safety of field effect transistor, also must dispel the heat, and the design of radiating structure is discussed in the back.Consider the design of low power consumption, drive circuit the 12V power supply controlled, the switching circuit control of being formed by triode Q3 and R19, under the situation that needs blower work, single-chip microcomputer just makes its energising.

Over-current protecting unit 205 seals in sample resistance silk RS at the leakage level common ground end of parallel field effect pipe, utilizes the electric current of series connection to equate principle, and the voltage on the RS is along with the electric current of motor load changes and changes, and electric current is big, and the voltage at RS two ends is also high.The resistance of resistance wire is very little, is less than 0.1 Europe.Therefore, the voltage signal on the sample resistance is very little, and after the in-phase amplification circuit by being made of operational amplifier, the processing of comparison circuit, single-chip microcomputer just can detect the current situation by main switch element.Consider the automobile application, amplifier is selected LM2902, wide temperature range ,-40 ℃～125 ℃.For low power dissipation design, the switch power control that the power supply of amplifier and pull-up resistor R17 is made up of triode Q2 and R18.Under the situation that needs blower work, single-chip microcomputer just makes its energising.

" embodiment " who speaks of in this manual, " another embodiment ", " embodiment ", etc., refer to concrete feature, structure or the characteristics described in conjunction with this embodiment and be included among at least one embodiment that the application's generality describes.A plurality of local appearance statement of the same race is not necessarily to refer to same embodiment in specification.Furthermore, when describing a concrete feature, structure or characteristics in conjunction with arbitrary embodiment, what advocate is to realize that in conjunction with other embodiments this feature, structure or characteristics also drop in the scope of the present utility model.

Although with reference to a plurality of explanatory embodiments of the present utility model the utility model is described here, but, should be appreciated that, those skilled in the art can design a lot of other modification and mode of executions, and these are revised and mode of execution will drop within the disclosed principle scope and spirit of the application.More particularly, in the scope of, accompanying drawing open in the application and claim, can carry out multiple modification and improvement to constituent elements and/or the layout of subject combination layout.Except modification that constituent elements and/or layout are carried out with improving, to those skilled in the art, other purposes also will be tangible.

Claims (4)

1. a blower for vehicle air conditioning stepless time adjustment system comprises blower and speed control switch, and it is characterized in that: described speed control system also comprises the stepless time adjustment module, and speed control switch is connected with the stepless time adjustment module, and the stepless time adjustment module connects blower again.

2. according to the described blower for vehicle air conditioning stepless time adjustment of claim 1 system; it is characterized in that: described stepless time adjustment module comprises power supply unit of voltage regulation, driver element, input processing unit, control unit and over-current protecting unit; the power supply of power supply unit of voltage regulation after with step-down passes to the control unit that is attached thereto; the input end of input processing unit connects power supply unit of voltage regulation; output terminal connects control unit; driver element one end is connected with control unit; the other end is connected with over-current protecting unit, and over-current protecting unit is connected with blower again.

3. according to the described blower for vehicle air conditioning stepless time adjustment of claim 1 system, it is characterized in that: the described heat-dissipating part of being formed by Heat sink that on the stepless time adjustment module, also is provided with.

4. according to the described blower for vehicle air conditioning stepless time adjustment of claim 2 system, it is characterized in that: described driver element and over-current protecting unit all are provided with switching circuit, carry out switch control by control unit.

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