CN1122434A - Efficient ultrasonic atomizing humidifier - Google Patents

Abstract

In the oscillator circuit of the said humidifier, the wideband serial and parallel resonance converting and mixing loop can selectively boost exciting signal so that the oscillating transistor obtains high exciting volatage and large exciting current. Thus, switch loss is decreased, oscillation waveform is imporved and the oscillating transistor operates in efficient type-B status. The said humidifier has high efficiency.

Description

Efficient supersonic atomizing humidifier

The invention belongs to the oscillating circuit technology of supersonic atomizing humidifier.

Domestic and international existing various supersonic atomizing humidifiers, though appearance design is varied, magnificent colourful, the structure and the performance of internal oscillator circuit are similar.For many years, the energy conversion efficiency of this oscillating circuit used for a long time does not have substantial progress.

Energy conversion efficiency is the key problem of high-power oscillating circuit all the time.The present invention proposes a kind of new design on 92102525.4 basis, its objective is the energy conversion efficiency that improves oscillating circuit, improve the reliability of oscillating circuit, stable and starting of oscillation performance, make the inherent quality of existing supersonic atomizing humidifier that one significantly and comprehensively substantive progress be arranged.

Below in conjunction with accompanying drawing principle of the present invention and principal character are elaborated.

Efficient supersonic atomizing humidifier of the present invention, oscillating tube BG in oscillating circuit ₁Base stage be connected to by inductance L ₃, capacitor C ₅, resistance R ₂, R ₄The low reactance-resistance ratio broadband series resonant tank of being formed that is used for improving oscillation efficiency.L ₃, R ₂Connect C with series system ₅, R ₄Connect L with series system ₃, R ₂With C ₅, R ₄Connect with series system; C ₅, R ₄The upper end of series circuit and oscillating tube BG ₁Base stage be connected, the lower end is connected with the common reference line or the reference point N of input signal; L ₃, R ₂The right-hand member of series circuit and oscillating tube BG ₁Base stage be connected, left end directly or by elements such as coupling capacitances is connected with pumping signal input M point; Be connected to high frequency dividing potential drop capacitor C between M point and the N point ₁Oscillating tube BG ₁Emitter stage directly or by small inductor be connected with the common reference line N of input signal.By above connection, make input signal constitute complete closed-loop path.

L ₃, R ₂, C ₅, R ₄Can be independently tangible separately element, also can be to lie among adjacent components and parts inside or the wiring, also can be made into the integrated package form.

Efficient supersonic atomizing humidifier of the present invention is by L ₃, R ₂, C ₅, R ₄Form low reactance-resistance ratio broadband series resonant tank, its action principle that connects compound mode is described as follows:

1, according to series resonance principle, C ₅Two ends can obtain higher resonance potential, so, C ₅Also can be called lifting electric capacity.R ₄Effect 5 points are arranged: the one, be used for reducing L ₃, C ₅The Q value in loop is widened its passband, guarantees that useful signal passes through smoothly.Because R ₂Resistance much smaller than R ₄So, L ₃, C ₅The unloaded Q in loop depends primarily on R ₄The 2nd, be used for stablizing the load impedance that M is ordered; The 3rd, be used for restriction from C ₅Flow to BG ₁The maximum excitation electric current of base stage; The 4th, keep by C ₃, C ₅, R ₄The negative-feedback divider of forming Deng element has sufficiently high negative-feedback dividing potential drop, to suppress the high frequency unwanted oscillation, improves waveform; The 5th, with implicit C ₁, L ₃, R ₂Buffer action is played in the shunt-resonant circuit, to support C ₁, L ₃, R ₂The parallel resonance function that the loop promotes exciting current.

2, C ₁, L ₃, R ₂With BG ₁The low equivalent internal resistance R of b, e knot when big current lead-through _BeCommon low reactance-resistance ratio broadband shunt-resonant circuit, the R of forming ₂Be used for limiting and reduce the Q value in loop, limit and flow to BG from the M point ₁The maximum excitation electric current of base stage is to stablize the load impedance that M is ordered.

BG ₁Be operated in the high-frequency high-power state, its β value when 1.7MHz is about 5-10.In order to make BG ₁Fully saturated, need be up to the base stage high frequency pumping electric current about 0.3-0.5A.BG ₁Dark when saturated, its b, e knot equivalent internal resistance R _BeResistance very low, often less than is one ohm.By the parallel resonance theory as can be known, R _BeResistance is low more, C ₁, L ₃, R ₂, R _BeThe Q value in loop is just high more, and resonance effect is just strong more, can be BG more ₁Base stage provides bigger exciting current, impels R _BeResistance further reduce, eucyclic result like this makes BG ₁Reach saturated deeply rapidly.

BG ₁When base stage high frequency pumping electric current is less or very little, R _BeResistance can pick up ohm to changing between hundreds of ohm at number.Work as R _BeResistance greater than L ₃Wave impedance the time, C ₁, L ₃The Q value in loop is less than 1, and the castering action of exciting current is weakened gradually until complete obiteration.Because R ₂Resistance very little, so, C ₁, L ₃The Q value in loop depends primarily on R _BeAs seen, has only BG ₁Be operated in current state, when promptly just the half cycle excitation waveform is near the top, C ₁, L ₃Castering action is just brought into play in the loop.

3, at the positive half cycle of pumping signal, BG ₁Conducting, b, e knot equivalent internal resistance R _BeBe connected in parallel on C ₅, R ₄Two ends.L ₃, C ₅The unloaded Q in loop generally gets 2-3, and the Q value during real work depends primarily on R _BeBG ₁Starting of oscillation just, or when vibration still is in small and weak state after the starting of oscillation, BG ₁The high frequency pumping electric current of base stage is less, R _BeResistance is bigger, is about number and picks up to hundreds of ohms, and it is to L ₃, C ₅The Q value influence in loop is very little, at this moment, and C ₅The driving voltage that M is ordered promotes Q doubly, at R ₄Current limliting under, to BG ₁Base stage exciting current is provided.C ₅This enhanced feature, to BG ₁Starting of oscillation and the enhancing of vibration, play swift and violent strong impetus.

BG ₁After the operate as normal, at the middle hypomere of positive half cycle excitation waveform, the base drive electric current is less, R _BeResistance is bigger, to L ₃, C ₅The Q value influence in loop is less, at this moment, and C ₅The performance castering action increases exciting current rapidly.

Along with BG ₁The increase of base drive electric current, R _BeResistance reduces gradually, works as R _BeResistance less than C ₅Wave impedance the time, C ₅The Q value less than 1, castering action weakens gradually until complete obiteration, at this moment, C ₅Just withdraw to second line gradually by first line.At this moment, C ₁, L ₃The loop progresses into first line, to exciting current performance castering action, makes BG ₁Enter dark saturation state rapidly.

4, when M point pumping signal is in negative half period, BG ₁End, the base drive electric current is zero, R _BeBe equivalent to open circuit.At this moment, C ₁, L ₃The shunt-resonant circuit disappears automatically, L ₃, C ₅Series resonant tank is in Light Condition, and its Q value reaches designed maximum, C ₅Castering action the strongest.C ₅The reverse voltage that M is ordered promotes Q doubly, and this negative electricity pressure energy is with BG ₁The base region stored charge oppositely extracts rapidly in time, thereby improves BG greatly ₁Switching speed, significantly reduce BG ₁Switching loss.Because C ₅Capacity be far longer than BG ₁B, e the knot junction capacity, R ₄Resistance very low again, so the extraction speed of above-mentioned stored charge be very fast very timely.C ₅The reverse voltage of upper end can also be guaranteed BG ₁Work in the higher Class B state of efficient.

As seen, C ₅You Ruyi polarity is the high-performance electronic pump of conversion automatically, it when positive half cycle to BG ₁Base stage provides exciting current, when negative half period, again with BG ₁The stored charge that the base is harmful extracts rapidly.At C ₁, L ₃With L ₃, C ₅In two loops, L ₃, C ₅The status in loop is even more important with effect.

5, L ₃, C ₅With C ₁, L ₃Two resonant tanks, its resonant inductance L ₃Be public, in the course of the work, rise one after another in two loops, and conversion is worked in coordination, dexterously so above-mentioned two loops are called automatic conversion hybrid resonant loop automatically.

Because C ₁Take into account the impedance matching of input circuit, thus the centre frequency of above-mentioned two resonant tanks often have than big difference, but because the Q value in two loops is all lower, the passband broad, add staggered tuning effect, make total passband wideer, more smooth, more help pumping signal and pass through smoothly.

6, at the negative half period of excitation signal waveforms, R _BeBe equivalent to open circuit.At this moment, because L ₃, C ₅The series resonance effect in loop makes C ₁Load be pure resistive, its resistance is about R ₂+ R ₄R ₂With R ₄The resistance sum generally is no more than 1.8 ohm, this resistance and C ₁Be in parallel, because the impedance between 2 of M, the N is very low, the high frequency voltage amplitude of transducing sheet TD two ends is corresponding to raise to some extent, and this moment is stage of releasing energy of TD just, and to produce mist efficient be favourable to improving for this.

7, oscillating tube BG ₁Performance have very big discreteness, its β value just often has the poor of several times.Work as BG ₁β value when low, for reaching saturated deeply, need bigger base drive electric current, at this moment, R _BeThe corresponding reduction of resistance, C ₁, L ₃The corresponding rising of Q value in loop strengthens the castering action of exciting current thereupon, makes humidifier still can keep enough big product mist amount, thereby reduces even remedied BG ₁The β value is hanged down the adverse effect to product quality caused.

8, because L ₃, C ₅With C ₁, L ₃Two loops have selecting frequency characteristic, can suppress the high frequency unwanted oscillation effectively, so the waveform of this circuit is better.Good waveform helps improve producing mist efficient, helps prolonging transducing sheet service life.

9, because L ₃, C ₅The loop has stronger lifting, booster action to small and weak oscillator signal, and can accelerate BG ₁Switching speed, improve its high frequency characteristics, so the starting of oscillation performance of this circuit significantly is better than background technology.

10, because the efficient height, the oscillating tube heat production greatly reduces, and radiator is difficult for hot, can reduce or avoid oscillating tube because of cause thermal damage that g-load caused effectively.

Now, introduce best implementation method so that the first generation of domestic modal Yadu D201 type humidifier and the transformation of second generation oscillating circuit board are embodied as example.

1, L ₃Close around 6.2 circles on the rod of garden, tin is as pin on the two end coating removals.

2, C ₁Get 0.068 microfarad, C ₅Get 0.027 microfarad.C ₆Get 0.068-0.082 microfarad.C ₃Get 0.24-0.68 microfarad.

3, R ₂Get 0.12-0.47 ohm.R ₄Get 1.0-1.5 ohm.

The element arrangements and the wiring of high-power high-frequency circuit have a significant impact performance, behind change element arrangements and the wiring, often need L ₃, C ₁, C ₅Do suitably to adjust Deng the parameter of element, to obtain optimum efficiency.

Claims (1)

1, a kind of supersonic atomizing humidifier is characterized in that oscillating tube BG in the oscillating circuit of humidifier ₁Base stage be connected to by inductance L ₃, capacitor C ₅, resistance R ₂, R ₄The low reactance-resistance ratio broadband series resonant tank of being formed that is used for improving oscillation efficiency.L ₃, R ₂Connect C with series system ₅, R ₄Connect L with series system ₃, R ₂With C ₅, R ₄Connect with series system; C ₅, R ₄The upper end of series circuit and oscillating tube BG ₁Base stage be connected, the lower end is connected with the common reference line or the reference point N of input signal; L ₃, R ₂The right-hand member of series circuit and oscillating tube BG ₁Base stage be connected, left end directly or by elements such as coupling capacitances is connected with pumping signal input M point; Be connected to high frequency dividing potential drop capacitor C between M point and the N point ₁Oscillating tube BG ₁Emitter stage directly or by small inductor be connected with the common reference line N of input signal.

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