CN2437077Y - Frequency-conversion type fan circuit - Google Patents

Abstract

The utility model discloses a circuitry for a novel frequency conversion type electric fan, comprising a frequency conversion main circuit part of alternating current, direct current and alternating current orderly, a direct-current voltage regulating part, a wind force control circuit part and a motor part. The frequency conversion circuit is composed of an inverter [2] and a pulse trigger [3] for a rectifying device [1] which is connected with the inverter; the wind force control circuit is composed of a timer [5] and an automatic controller [6] for a wind speed regulator [4] which is connected with the timer, wherein, the pulse trigger [3] adopts an SPWM sine-wave pulse width modulation technique, and the automatic controller [6]can realize the function of automatically decreasing wind forc in a timed period, so that the utility model is more suitable for users who are at rest. The circuitry also has the effect of energy saving.

Description

Frequency conversion type electric fan circuit

The utility model is the circuit about the frequency conversion type electric fan.

Electric fan is various in style in the market, and is fashionable, but mostly is to work hard on its outward appearance or some additional functionality, is similar with regard to its main circuit, do not have the fan of which kind of brand to have the power of striving especially unexpectedly.Essentially, the fan on the market adopts the method for pressure regulation to regulate wind-force basically.Its weak point is: one, thereby when fan electromotor low pressure low cruise motor easily heating influence its life-span, and motor easy burn-out, almost nobody is ready to spend to repair to burn out the fan of motor, causes waste; It mostly is that stepping is regulated that its two wind-force is regulated, and is difficult for regulating required wind-force when people's rest, and they are three years old, the timing shutdown function, all adopt regularly wind-force constant, it can influence people's health when big and time of having a rest was long when wind-force, moreover as above-mentioned fan waste very much electric energy.

The utility model purpose is to overcome the shortcoming of prior art, but a kind of wind-force step-less adjustment is provided, and wind-force possesses automatic decline function, the domestic electric fan circuit of energy savings in the timing.Technical solutions of the utility model are summarized as follows:

Convert power-frequency voltage to direct voltage by rectifying device [1] in this circuit and give [2], and [2] give [8] power supply in [3] and the variable-frequency alternating voltage of output of controlling down of controlling it [4], described [1] [2] [3] [8] form constant voltage and frequency ratio SPWM frequency conversion speed-adjusting system.Voltage stabilizing circuit [7] output voltage is powered to control system, and it is to utilize capacitance-resistance charge and discharge capacitance voltage to go control [3] through voltage follower output wind velocity signal voltage that wind speed is regulated [4].Timer [5] is made up of pulse oscillation circuit [9] and eight-digit binary number counter [10], automatically control [6] is made up of D/A converter [11] single limit comparator [12] MUX [13], the pulse of pulse oscillation circuit in the described circuit [9] is counted device [10] counting, the value of counter [10] can be converted into aanalogvoltage by D/A converter [11] and go control [12] and [13], and then control [4] realizes automatic controlled function, described circuit composition multifunctional variable-frequency formula electric fan circuit.

Certainly foregoing circuit both can adopt single-phase system limit can adopt three-phase system.Below in conjunction with accompanying drawing the utility model technology is further described:

Fig. 1 is the structure chart of the utility model electric fan circuit

Fig. 2 is the cut-away view of [5];

Fig. 3 is the cut-away view of [6].

Fig. 4 is the electrical schematic diagram that [4] [5] [6] [7] are formed.

In Fig. 1 by [1] [2] [3]] 8] to form its technology of constant voltage and frequency ratio SPWM frequency conversion speed-adjusting system quite ripe, this circuit is the small-power governing system, repeats no more here.Take from [1] output dc voltage among Fig. 4 via R ₂₀, D ₁, C ₁Form voltage stabilizing circuit [7] and supply positive direct-current voltages to system.Capacitor C ₂Voltage is as wind speed primary signal, IC ₁For being output as the wind-force signal, voltage follower and its go control [3].Press S ₁Through R ₁Give C ₂Charging wind-force rises, otherwise presses S ₂Through R ₂Give C ₂Discharge wind-force can descend K ₁Be the automatic/hand change over switch.

By 555 is IC ₂Form impulse hunting [9], its cycle of oscillation T ₁=1.1 (R+W ₁) C ₂R:(R ₃, R ₄, R ₅, R ₆, R ₇), frequency of oscillation is IC through eight-digit binary number counter [10] ₃Behind 256 times of frequency divisions, timing T as can be known ₂=256 * 1.1 (R+W ₁) C ₃, timing can reach several hours, needs regularly available SW ₁Select timing.The digital value of counter [10] is IC through D/A converter [11] ₄Being converted into aanalogvoltage, is SW through MUX [13] again ₂Remove to control triode T ₁, T ₁Collector voltage with counter IC ₃Value increase and reduce, output reduces thereupon thereby wind-force is regulated [4], wind-force will also reduce thereupon.

Whenever counter [10] is IC ₃Value D/A converter [11] IC when being 250-255 ₄Output will reach maximum, be IC thereby make single limit comparator [12] ₅Output, relay J under manual state ₁C is given in adhesive ₂Short circuit dischange, thereby shutdown are realized the timing shutdown function.

Under auto state through R ₁₇, R ₁₉, C ₄Acting on counter [10] is IC ₃CE end make it stop counting and keep its value constant, so D/A converter [11] is IC ₄Also can keep its output voltage constant.

Wind speed slowly drops to the shutdown function, then available SW in the timing if begin to be provided with ₂Be threaded to its 5th grade, if timing arrives, counter [10] is IC ₃Stop counting and keep its value constant, so D/A converter [11] is IC ₄Also can keep its output maximum voltage constant, so the time by R ₁₁And R ₁₆Dividing potential drop can make T ₁Full conducting, thereby IC ₁Being output as zero wind-force promptly stops; Wind-force slowly drops to the regularly fixed shelves of a certain wind-force, then available SW in the timing if be provided with during beginning ₂Rotate to its 1,2,3,4 grades, if timing arrives, counter [10] is IC ₃Stop counting and keep its value constant, so D/A converter [11] is IC ₄Also can keep its output maximum voltage constant,, can make T by electric resistance partial pressure ₁The collector electrode output voltage, IC ₁Also export the wind-force signal voltage and can realize regularly fixed shelves.SW among Fig. 4 ₁1,2,3,4 grades be regularly shelves, the 5th grade for the auto state initial wind-force of adjusting down, presses S ₄Because of R ₃Resistance is less, so IC ₂The frequency of oscillation height can make counter IC ₃One initial value is arranged, and then make T ₁Collector electrode has output.S ₃Be counter IC ₃Reset button.

The utility model compared with prior art has the following advantages:

But 1 wind speed step-less adjustment;

2 have automatic wind speed decreased function,

3 circuit adopt the energy-conservation effect of Switching Power Supply tool

4 circuit series electron circuits are convenient to realize remote control.

Claims (4)

1 one kinds of electric fan circuit, it comprises motor power, the wind shelves are regulated and timing device, and direct current regulation circuit [7] motor four parts such as [8] is characterized in that: the contravariant variable frequency power supply of described motor power for being made up of inverter [2] and the rectifying device that links to each other with it [1] pulse-triggered [3]; Described wind shelves are regulated and timing device is regulated [4] by timer [5] and the wind speed that links to each other with it and controlled [6] automatically and form; Above-mentioned [5] are made up of extremely low frequency impulse hunting [9] and coupled counter [10], and [6] are made up of D/A converter [11] and coupled single limit comparator [12] MUX [13]; Wherein [4] includes IC ₁Output links to each other with [3], and the output of [10] links to each other with [11] input, [11] output respectively with [12] inner IC ₅In-phase input end links to each other with the input of [13], and the output of [12] links to each other with the counting end that stops of [10], [13] inner triode T ₁Collector electrode by change over switch K ₁Link to each other with the in-phase input end of [4]; Described voltage stabilizing circuit [7] links to each other with the power end of the output [3] [4] [9] [10] [11] [12] [13] of [1] respectively; The in-phase input end of described [4] also is provided with manual change over switch K ₁, the timing end of [9] also is provided with five grades of change over switch SW ₁, the clear terminal of [10] also is provided with button S ₃, [13] inner T ₁Base stage five grades of change over switch SW also are set ₂

2 electric fan circuit according to claim 1 is characterized in that [3] employing SPWM sinusoidal pulse width modulation technology.

3 electric fan circuit according to claim 1 is characterized in that set five grades of change over switch SW are held in the timing of [9] ₁The 1-4 shelves be regularly shelves; The 5th grade for regulating the usefulness of initial wind-force, the frequency of oscillation height of [9] at this moment under the automatic mode.

4 electric fan circuit according to claim 1 is characterized in that the set five grades of change over switch SW in inside of [13] ₂The 1-4 shelves be the wind speed shelves that will select; The 5th grade is shut down in the timing under the automatic mode shelves, T at this moment ₁Full conducting.

Images