CN2252451Y

CN2252451Y - Stepless speed regulator for vehicle electric fan air conditioner cold and warm air motor

Info

Publication number: CN2252451Y
Application number: CN96220089U
Authority: CN
Inventors: 张青
Original assignee: Individual
Current assignee: Individual
Priority date: 1996-08-12
Filing date: 1996-08-12
Publication date: 1997-04-16
Anticipated expiration: 2006-08-12

Abstract

The utility model discloses a stepless speed regulator for vehicles, electric fans, air conditioners, and cold and warm air motors, which is composed of an integrated circuit and the electronic component of a semiconductor. The regulation operation switches of the existing vehicle, electric fan, air conditioner, and cold and warm air motor are divided into 2-3 positions. So the existing vehicle, electric fan, air conditioner, and cold and warm air motor can not freely regulate wind quantity according to requirements. The stepless speed regulator can thoroughly solve the defect of the regulation operation switch of air quantity with positions. The utility model can carry out timely wind quantity regulation according to season temperature, weather, engine temperature and the health situation of drivers.

Description

Motor vehicle electric fan air conditioner cold-warm wind-powered electricity generation machine stepless speed adjusting gear

The utility model relates to digital and electronic control technology field, is a kind of the stepless speed adjusting gear of application of electronic technology in motor vehicle electric fan, air-conditioning, the control of changes in temperature wind-powered electricity generation machine (following general designation blower fan) rotating speed, can make the size of blower fan air output adjustable arbitrarily.

The console switch of adjusting fan delivery is grade type in the present motor vehicle, 2～3 grades of general branches, all be connected to resistive element between every grade, switch is placed on different gears, just the resistance of different resistances is connected in the electric power loop of blower fan with the mode that is connected in series, utilize the hypotensive effect of resistance, make blower fan when switch is placed on different gears, obtain different supply voltages, the voltage height that blower fan obtains, its rotating speed is just fast, air output is big, voltage is low, rotating speed is just slow, and air output is little, and this regulative mode is owing to the resistance of each grade resistance is fixed, can only its rotating speed of coarse adjustment, so the switch gear what the thickness of its rotating speed range of choice depends on, and the selector switch of adjusting fan delivery has only 2～3 grades in the present motor vehicle, its shortcoming is one: changing according to the season the time, the weather variations in temperature, driver's health can't make when changing and obtain optimum temperature air quantity in driver and the car.Two: owing to utilize the resistive element step-down, the electrical power that resistance itself consumes is very big, so electric energy loss is big.

The purpose of this utility model is fundamentally to overcome the shortcoming of above-mentioned multi-gear type fan delivery adjuster, and its feature is: do not have gear 1..2. the rotating speed of the adjusting blower fan of energy continuous stepless changes air output.3. rotational speed regulation wide ranges (full rotating speed 3%～99%).4. shutdown back rotating speed memory function is arranged, and the rotating speed the when rotating speed when guaranteeing to start shooting again shut down with last time is identical.5. the rotating speed preset functions is arranged, when not starting shooting, can set rotating speed roughly.6. release handle and switch are integrated, need not independent switch.

The purpose of this utility model is to realize like this; It is made up of the potentiometer of a belt switch, a semiconductor integrated circuit, semiconductor power device, several crystal diodes, resistance, an electric capacity.

Integrated circuit (IC) and potentiometer with switch W form a frequency of oscillation and fix but the pulse width modulator of pulse duration EDM Generator of Adjustable Duty Ratio, the position that changes potentiometer W central slide contact will change the time ratio of pulse width modulator RC charging and discharging circuit, pulse width modulator is with regard to the constant and square-wave signal of pulse duration change in duty cycle of output frequency of oscillation, the output of pulse width modulator is connected to a power switch T, power switch T is operated in conducting according to square-wave signal, cut-off state, control the blower fan length of conduction time in the pulse period, if the time scale that positive pulse accounts in the pulse period is big, the time of power switch conducting is long, the time of blower fan energising is just long, its mean direct voltage that obtains is just high, the rotating speed of blower fan is just high, otherwise the rotating speed of blower fan is just low.

Fig. 1 is the block diagram of speed regulator;

Fig. 2 is the electrical schematic diagram of speed regulator;

Below in conjunction with accompanying drawing embodiment of the present utility model is elaborated.

Fig. 1 shows the block diagram of this speed regulator.

The A=pulse width modulator;

The B=power switch;

C=blower fan (motor vehicle itself).

The pulse square wave signal that pulse width modulator (A) is responsible for producing the square-wave signal of fixed-frequency and is exported corresponding duty ratio according to set-point, no matter how be characterized in pulse duty factor changes, its frequency of oscillation is constant, (A) square-wave signal is exported to power switch (B), (B) be subjected to the Control work of square-wave signal on off state, (B) blower fan (C) on the controller motor-car is removed in output, (B) ON time is long, (C) Tong Dian time is just long, rotating speed is just fast, (B) ON time is short, (C) Tong Dian time just short, rotating speed is just slowly.

Fig. 2 shows the electrical schematic diagram of this speed regulator.

2 couples of embodiment of the present utility model do the explanation of detailed circuit principle below in conjunction with accompanying drawing.

Potentiometer with switch W and R1.R2.C1.C2.D1.IC ₁Form pulse-width modulation circuit, wherein W.R1.R2.C1.D1 is the charging and discharging circuit of pulse width modulator, when just switching on, because the voltage on the C1 can not suddenly change, i.e. and

IC

₁2,6 pin take-off potentials be earth potential, this moment IC ₁Output 3 pin set, be high potential, power switch T conducting, D is low level very, the blower fan M rotation of switching on, power supply charges to C1 by D1 through the resistance of the R1+W first half, its charging interval;

T _Fill=0.693 (R1+W _On) C1

Voltage on C1 is charged to IC ₁Threshold level 2/3 supply voltage the time, IC ₁Reset, its 3 pin is transmitted low level, and power switch T ends, and its D is high level very, and blower fan M outage stops operating, simultaneously IC ₁7 strength of one's legs ground levels, the resistance of C1 this moment by R2 and W Lower Half is by IC ₁7 pin discharge its discharge time;

T _Put=0.693 (R2+W _Down) C1

Above process has formed the condition of vibration, makes continuing that pulse width modulator goes round and begins again, at IC ₁The pulse square wave of a fixed-frequency of 3 pin output.

If duty ratio is D, then;

D=T _Fill/ T=R1+W _On/ R1+W+R2

Regulate W1, when its center head slides to topmost;

D _MIN=T _Fill/ T=R1/W+R2

When the W1 center head slides to bottom;

D _MAX＝W＋R1/W＋R1＋R2

D1 is the guiding diode of RC charge circuit, and irrelevant with discharge loop, the speed adjustable range of W value decision speed regulator, the minimum speed of R1 decision speed regulator, the maximum speed of R2 decision speed regulator, IC ₁3 pin are outputs of pulse width modulator, it is connected to the G utmost point of power switch T by C3, R3, the D utmost point of T is an output, it connects with the negative pole of motor vehicle fan, has so just realized the control of speed regulator circuit to blower fan.

D2 is connected in parallel on the two ends of blower fan, is that the protection diode that absorbs reverse impulse voltage for T is again the fly-wheel diode of blower fan M simultaneously, guarantees the operate as normal of blower fan M at power switch T blocking interval.

The start of this speed regulator is default, the shutdown memory function is to lean on the architectural characteristic of potentiometer W itself to realize, potentiometer W and K switch are one, the process of switch pulls out, advances the potentiometer swing handle to realize, in the process of switch, can not change the position of potentiometer center moving contact, therefore, utilize the design feature of himself can realize this two functions.

IC ₁Be 555 time-base circuits.

Claims

1. one kind is used for motor vehicle electric fan air conditioner cold-warm wind-powered electricity generation machine stepless speed adjusting gear, and it is made up of pulse width modulator, power switch, mains switch, it is characterized in that:

The pulse width modulator output frequency is fixed, the rectangular pulse signal of EDM Generator of Adjustable Duty Ratio, as the input control signal of power switch (T);

The meet sb. at the airport motor (M) of motor-car electric fan, air-conditioning, cold and warm air heating radiator of the output of power switch (T), it is subjected to the Control work of input signal on off state, the length of motor (M) conduction time in the pulse period of controller motor-car electric fan, air-conditioning, cold and warm air heating radiator.

2. motor vehicle electric fan air conditioner cold-warm wind-powered electricity generation machine stepless speed adjusting gear according to claim 1 is characterized in that mains switch (K) and potentiometer (W) are one, and the process of its switch is to realize by the mode of pulling out, advance the potentiometer rotating handle.

3. motor vehicle electric fan air conditioner cold-warm wind-powered electricity generation machine stepless speed adjusting gear according to claim 1 is characterized in that power switch (T) can be the VMOS power field effect transistor, also can be normal transistor.