CN203482181U - Humidifier atomization circuit with constant power - Google Patents
Humidifier atomization circuit with constant power Download PDFInfo
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- CN203482181U CN203482181U CN201320630155.4U CN201320630155U CN203482181U CN 203482181 U CN203482181 U CN 203482181U CN 201320630155 U CN201320630155 U CN 201320630155U CN 203482181 U CN203482181 U CN 203482181U
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- 238000000889 atomisation Methods 0.000 title claims abstract description 57
- 230000010355 oscillation Effects 0.000 claims abstract description 49
- 239000003990 capacitor Substances 0.000 claims description 139
- 239000000919 ceramic Substances 0.000 claims description 31
- 239000003595 mist Substances 0.000 claims description 30
- 238000005070 sampling Methods 0.000 claims description 17
- 238000000034 method Methods 0.000 claims description 12
- 238000001914 filtration Methods 0.000 claims description 11
- -1 resistance R 3 Substances 0.000 claims description 8
- TVEXGJYMHHTVKP-UHFFFAOYSA-N 6-oxabicyclo[3.2.1]oct-3-en-7-one Chemical compound C1C2C(=O)OC1C=CC2 TVEXGJYMHHTVKP-UHFFFAOYSA-N 0.000 claims description 3
- 230000001105 regulatory effect Effects 0.000 abstract description 4
- 230000003321 amplification Effects 0.000 abstract 1
- 238000003199 nucleic acid amplification method Methods 0.000 abstract 1
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- 238000010923 batch production Methods 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000001704 evaporation Methods 0.000 description 2
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- 239000000463 material Substances 0.000 description 2
- 229920003023 plastic Polymers 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
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- 241000238367 Mya arenaria Species 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
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- 238000005485 electric heating Methods 0.000 description 1
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Abstract
The utility model relates to the technical field of circuit structure design of a humidifier. The utility model provides a humidifier atomization circuit with constant power. The humidifier atomization circuit comprises a fog volume control circuit, an ultrasonic oscillation circuit and a power automatic constant circuit. The fog volume control circuit provides a proper bias current for an ultrasonic oscillation circuit; an input terminal of the power automatic constant circuit samples a working current of the ultrasonic oscillation circuit; error control amount is outputted after the sampled current signals are subjected to phase inversion amplification; and further shunt control is carried out on the bias current outputted by a DC biasing circuit, so that the bias current inputted to the ultrasonic oscillation circuit can be regulated automatically; work current in the humidifier atomization circuit can be stable; and the power can be constant. An NPN triode is used as a dynamic regulation device to track and regulate a base bias current of a BU406 oscillation triode Q3 in real time, so that the object of constant power can be achieved.
Description
Technical field
The utility model relates to humidifier circuit structure design technical field, relates in particular to a kind of humidifier atomization circuit of power invariability.
Background technology
The product in household humidifier market is mainly divided into ultrasonic type humidifier, direct evaporating humidifier and evaporation type humidifier three classes at present.Ultrasonic technology is a kind of technology of comparative maturity, has been widely used in various fields.Ultrasonic humidifier adopts ultrasonic wave high frequency oscillation, makes water fogging as the ultramicron of 1-5 micron, passes through aerophor, water smoke is diffused in air, makes negative oxygen ion with the humid air and that association is abundant, energy fresh air, improve health, build comfortable living environment.The advantage of ultrasonic humidifier is, adds wet strength large, and humidification is even, and humidification efficiency is high; Energy-conservation, power saving, power consumption is only 1/10 to 1/15 of electric heating humidifier; Long service life, humidity autobalance, anhydrous automatic protection.
With reference to figure 1 and Fig. 2, be typical ultrasonic type humidifier atomization circuit figure, employing be capacitance three-point type self-maintained circuit.It is the mode that potentiometer regulates mist amount that Fig. 1 adopts, and what Fig. 2 adopted is to process the mist amount regulative mode of cpu i/f with central authorities.This tradition atomization circuit has the advantages such as circuit is simple, cost is moderate, but also has some shortcomings:
1, affected greatly by the multiplication factor of generator triode, β value is high-power large, and β value small-power is just little, and homogeneity of product is poor, operating cost is high.
With reference to figure 1, the local circuit schematic diagram that has shown ultrasonic humidifier atomization circuit part, comprise mist amount control circuit and supersonic oscillations circuit, described mist amount control circuit comprises switch S 1 and DC bias circuit, DC bias circuit consists of resistance R 1, resistance R 2, potentiometer VR1, potentiometer VR2, a suitable bias current is provided to BU406 generator triode Q3, the value of adjusting potentiometer VR1 can regulate bias current, regulate bias current to equal to regulate fog-supplying amount, adjust the value of potentiometer VR2, fine-tuning bias current size.Switch S 1 links with potentiometer VR1, switch S 1 is main switch, be used for controlling humidifier unlatching work or close, potentiometer VR1 is mist amount regulator potentiometer, and potentiometer VR2 is for finely tuning the potentiometer of bias current, in production process, for regulating power (regulating bias current to equal regulating power), make product reach consistency.
Supersonic oscillations circuit, by atomizing piece, piezoelectric ceramic B1, resistance R 21, capacitor C 4, capacitor C 6, resistance R 3, capacitor C 1, BU406 generator triode Q3, diode D3, capacitor C 3, inductance L 1, inductance L 2, inductance L 3 form.
With reference to figure 1, its operation principle of ultrasonic humidifier atomization circuit is: when humidifier is opened, switch S 1 is connected, DCIN+ direct voltage is by switch S 1, resistance R 1, resistance R 2, potentiometer VR1(mist amount regulates), potentiometer VR2(is for power fine setting, the multiplication factor that makes up BU406 is discrete), inductance L 1, resistance R 21, resistance R 3, the BE knot of BU406 generator triode Q3, inductance L 2, inductance L 3 and GND form bias current, make BU406 generator triode Q3 conducting, now by capacitor C 4 upper ends, piezoelectric ceramic B1(regards a LC loop as atomizing piece B1), the C of BU406 generator triode Q3, the E utmost point, capacitor C 6 lower ends, capacitor C 6 upper ends, capacitor C 4 lower ends form a discharge loop, also capacitor C 6 is charged simultaneously, capacitor C 6 is discharge loops for capacitor C 4, also be a Bootstrap electric capacity simultaneously, for the lasting conducting of BU406 generator triode Q3 provides electric energy.Along with the lasting charging of capacitor C 6 (lower negative on just), can form a reverse biased at the BE of BU406 generator triode Q3 knot, make BU406 generator triode Q3 transfer cut-off state to by conducting, after BU406 generator triode Q3 cut-off, the voltage at the two ends of capacitor C 6 be lower negative on just, now diode D3, piezoelectric ceramic B1, capacitor C 4, a discharge loop of capacitor C 6 upper ends formation can be passed through in the upper end of inductance L 1, and now capacitor C 4 charging voltages are lower just upper negative.Continuous electric discharge along with capacitor C 6, at the BE of BU406 generator triode Q3, tying formation reverse biased constantly weakens, final BU406 generator triode Q3 can exit cut-off state, now due to the effect in direct current biasing loop, BU406 generator triode Q3 enters conducting state again from cut-off state again, thereby again repeat above-mentioned process, so go round and begin again and just formed the higher-order of oscillation.
Be subject to multiplication factor (the β value of BU406 generator triode Q3 is between the 30-150) impact of BU406 generator triode Q3 very large, the in the situation that of identical biasing, use the large triode of multiplication factor, its atomization power is just large, otherwise atomization power is just little, discreteness is very large, is unfavorable for batch production.Conventionally can add at bias loop the potentiometer VR2(adjustable resistance of suitable resistance), in order to Modulating Power, the value that makes it to reach suitable and control consistency in batches, and adding of potentiometer VR1 easily causes loose contact, potentiometer price that power is larger also higher; And add potentiometer VR2, also cannot cover the multiplication factor of all BU406 generator triode Q3 completely, make the too high or too low triode of multiplication factor still can exceed the adjusting range of potentiometer, thereby power is gone beyond the scope, so humidifier is when batch production, BU406 generator triode Q3 must select suitable the using of multiplication factor, while increasing unnecessary cullers, also give in the buying of material and bring very large trouble simultaneously.Because the BU406 generator triode Q3 in delivery, amplifies figure place between 30-150 in batches, if only used certain part, remainder will be difficult to process.
Same, with reference to figure 2, also there is same technical problem in its ultrasonic humidifier atomization circuit.
2, power can rise with temperature, affects useful life and the fail safe of humidifier.
With reference to figure 2, the ultrasonic humidifier atomization circuit of this programme is to adopt the local circuit schematic diagram that carries out the ultrasonic humidifier atomization circuit part of mist amount adjusting with CPU, comprises mist amount control circuit and supersonic oscillations circuit.
Mist amount control circuit comprises electronic switch and DC bias circuit, by central authorities, process CPU, resistance R 17, triode Q2, resistance R 20, resistance R 19 and 2N5401 triode Q1 form an electronic switch, the pwm signal that is subject to central authorities to process CPU output is controlled, thereby mist amount is carried out to corresponding adjusting, specifically by DC bias circuit, regulate the bias current of BU406 generator triode Q3 to realize, when if PWM duty ratio equals 0%, close completely, at this moment equal to have closed mist, when if duty ratio is 100%, mist amount is maximum, if duty ratio is between 0%-100%, mist amount is also between minimum and maximum so, as long as controlled duty ratio just can control fog-supplying amount and whether go out mist simultaneously.DC bias circuit: consist of resistance R 5, potentiometer VR1, DC bias circuit provides a suitable bias current to BU406 generator triode Q3, adjusts the value of potentiometer VR1 and can finely tune bias current size.
Supersonic oscillations circuit: by piezoelectric ceramic B1, capacitor C 4, capacitor C 6, resistance R 3, capacitor C 1, capacitor C 3, BU406 generator triode Q3, diode D3, inductance L 1, inductance L 2, inductance L 3 form.
In Fig. 2, the operation principle of circuit is: when humidifier is opened, central processor CPU output high level, triode Q2(S8050), Q1(2N5401) conducting, DCIN+ direct voltage passes through Q1(2N5401) E, the C utmost point, flow through resistance R 5, potentiometer VR1, inductance L 1, resistance R 3, the BE knot of BU406 generator triode Q3, inductance L 2, inductance L 3 and GND form bias current, make BU406 generator triode Q3 conducting, now by capacitor C 4 upper ends, piezoelectric ceramic B1(regards a LC loop as atomizing piece B1), the C of BU406 generator triode Q3, the E utmost point, capacitor C 6 right-hand members, capacitor C 6 left ends, capacitor C 4 lower ends form a discharge loop, also capacitor C 6 is charged simultaneously, capacitor C 6 is discharge loops for capacitor C 4, also be a Bootstrap electric capacity simultaneously, for the lasting conducting of BU406 generator triode Q3 provides electric energy.Along with the lasting charging of capacitor C 6 (the left negative right side just), can form a reverse biased at the BE of BU406 generator triode Q3 knot, make BU406 generator triode Q3 transfer cut-off state to by conducting, after BU406 generator triode Q3 cut-off, the voltage at the two ends of capacitor C 6 is that the right side is just being born in a left side, now the right-hand member of capacitor C 6 can pass through diode D3, piezoelectric ceramic B1, capacitor C 4, a discharge loop of capacitor C 6 left ends formation, and now capacitor C 4 charging voltages are upper just lower negative.Continuous electric discharge along with capacitor C 6, at the BE of BU406 generator triode Q3, tying formation reverse biased constantly weakens, final BU406 generator triode Q3 can exit cut-off state, now due to the effect in direct current biasing loop, BU406 generator triode Q3 enters conducting state again from cut-off state again, thereby again repeat above-mentioned process, so go round and begin again and just formed vibration.
By above-mentioned operation principle, can be found out, when circuit is started working by cold conditions, its power can rise and increase with the temperature of device, and power rises and makes again temperature further increase, and forms the circulation of a unfavorable circuit working.Conventionally the power that the input power of humidifier can produce 20-30% in several minutes rises, and along with the lasting rising of temperature, power also can continue to rise.Humidifier when work be because the device work meetings such as heating tube (PTC heat-generating pipe, for the parts that water temperature is heated), BU406 generator triode, atomizing piece, power resistor produce certain temperature rise, thereby make device itself and interior environment temperature rising.Temperature can make some thermally sensitive components and parts operating characteristic that certain variation occurs after rising, and as low in the forward conduction voltage drop of meeting semiconductor device, BU406 generator triode Q3 multiplication factor (β value) increases, interpolar reverse leakage current I
cEO, I
cBOincrease, transistor thermal noise increase etc.
With reference to figure 1 and Fig. 2, BU406 generator triode Q3 in humidifier atomization circuit, triode Q1(2N5401), the parameters such as its interpolar reverse leakage current, β value, thermal noise, junction capacitance, BE knot forward conduction voltage (Vbe decline) will be subject to the impact of temperature, thereby the total effectively base bias current that injects BU406 generator triode Q3 is increased, the total working electric current of atomization circuit increases, the result that finally causes atomizer increased power, total power input to rise.
Known according to analyzing above, the power of humidifier atomization circuit wafts, and to rise topmost reason be the result that the multiplication factor of BU406 generator triode Q3 rises and causes with temperature.In above-mentioned two kinds (with reference to figure 1 and Fig. 2) common humidifier atomization circuit, its atomization power determines by following formula:
P: the power of atomization circuit;
Vdcin: the direct-current working volts of atomization circuit;
The BE junction voltage of Vbe:BU406 generator triode Q3;
R1, R2, R3, base biasing resistor R1, the R2 of R4:BU406 generator triode Q3, R3, R4 resistance;
B: i.e. β value, the multiplication factor of BU406 generator triode Q3;
B value (being β value, the multiplication factor of BU406 generator triode Q3) is the key factor that affects atomization circuit power as can be seen from the above equation,
be constant, when β value varies with temperature, power changes thereupon.
Temperature rising can cause power to rise, and power rises and causes conversely again temperature further to rise, and makes circuit enter a vicious circle that is unfavorable for circuit working.Temperature rising can make circuit working reliability reduce, the life-span of components and parts also will have a greatly reduced quality, may cause the burning of humidifier plastic casing simultaneously, and the inflaming retarding shell of humidifier generally only can bear 75 degree, surpassing these temperature plastics can soft shell distortion cause atomization base to get loose, leak, and leaks and will cause electric leakage, electric shock, the danger such as on fire.
Utility model content
In order to solve, above-mentionedly to generator triode, need choice for use, power can float liter with temperature, need the technical problem of manual adjustment power, the easy loose contact of regulator potentiometer, the utility model provides a kind of humidifier atomization circuit of power invariability, this atomization circuit is by adopting little resistance resistance to sample to atomizer operating current, adopt NPN triode as dynamic regulator part, real-time tracking is adjusted the base bias current of generator triode, thereby reaches the object of firm power.
In order to achieve the above object, the technical scheme that the utility model adopts is a kind of humidifier atomization circuit of power invariability, comprise mist amount control circuit, supersonic oscillations circuit and power automatic constant circuit, described mist amount control circuit comprises ON-OFF control circuit and DC bias circuit, described ON-OFF control circuit provides power control signal for DC bias circuit, described DC bias circuit provides a suitable bias current for supersonic oscillations circuit, described power automatic constant circuit input is connected with the negative pole common port of supersonic oscillations circuit, described power automatic constant circuit output is connected with the output of DC bias circuit, the negative pole common port of described power automatic constant circuit is connected with ON-OFF control circuit negative pole, described power automatic constant circuit input is sampled to the operating current of supersonic oscillations circuit, sampling after-current signal is carried out to paraphase and amplify rear output error controlled quentity controlled variable, and then the bias current of DC bias circuit output is carried out to flow-dividing control, thereby automatically regulate the bias current of input supersonic oscillations circuit, make the operating current in humidifier atomization circuit stable, and then firm power.
Further, described power automatic constant circuit comprises current sampling circuit, filter circuit and error amplifying circuit, current sampling circuit input is connected with the negative pole common port of supersonic oscillations circuit, the output of circuit sample circuit is connected with filter circuit input, filter circuit output be connected with error amplifying circuit signal input part, error amplifying circuit signal output part is connected with DC bias circuit output, and the negative pole common port of error amplifying circuit is connected with ON-OFF control circuit negative pole.
Further, described current sampling circuit consists of resistance R 7, these resistance R 7 one end are connected with the negative pole common port of supersonic oscillations circuit, resistance R 7 obtains current sampling signal from the negative pole common port of supersonic oscillations circuit, described filter circuit is the integrating circuit consisting of resistance R 6 and capacitor C 7, this current sampling signal obtains current signal after integrating circuit smothing filtering, being formed by triode Q4 of described error amplifying circuit, current signal after integrating circuit smothing filtering adds to the base stage of the triode Q4 of error amplifying circuit, the collector electrode of triode Q4 is connected with DC bias circuit output, the emitter of triode Q4 is connected with ON-OFF control circuit negative pole, triode Q4 carries out paraphase to current signal and amplifies rear output error controlled quentity controlled variable, and then the bias current of DC bias circuit output is carried out to flow-dividing control.
Further, described ON-OFF control circuit comprises main switch S1, and this switch S 1 is connected to DC power supply DCIN+, and described DC bias circuit is by resistance R 1, resistance R 2 and potentiometer VR1 form, switch S 1 and potentiometer VR1 interlock, after potentiometer VR1 mono-stiff end series resistance R2 and resistance R 1, be connected to switch S 1 one end, the capacitor C 2 that is connected in parallel between described DC bias circuit and supersonic oscillations circuit is carried out filtering, and described supersonic oscillations circuit is by piezoelectric ceramic B1, resistance R 21, capacitor C 4, capacitor C 6, resistance R 3, capacitor C 1, BU406 generator triode Q3, diode D3, capacitor C 3, inductance L 1, inductance L 2 and inductance L 3 form, and described another stiff end of potentiometer VR1 is connected to the collector electrode of diode Q2, and this end is also connected to one end of inductance L 1, described inductance L 1, resistance R 21, resistance R 3, the BE knot of BU406 generator triode Q3, inductance L 2, inductance L 3 and public negative pole end connect and compose bias current loop successively, described capacitor C 4, piezoelectric ceramic B1, the CE knot of BU406 generator triode Q3, inductance L 2, capacitor C 6 connects and composes charge circuit successively, described capacitor C 6, inductance L 2, diode D3, piezoelectric ceramic B1 and capacitor C 4 connect and compose discharge loop successively, and described capacitor C 3 is for being parallel to the resonant capacitance of load.
Further, described ON-OFF control circuit is processed CPU by central authorities, resistance R 17, triode Q2, resistance R 3, resistance R 19 and 2N5401 triode Q1 form PWM ON-OFF control circuit, described DC bias circuit consists of resistance R 5, central authorities process CPU pwm control signal output and are connected to resistance R 17, resistance R 17 is connected with the base stage of triode Q2, the grounded emitter of triode Q2, after the collector series resistance R19 of triode Q2 and resistance R 3, be connected to DC power supply DC1N+, this end is also connected with the emitter of triode Q1 simultaneously, the base stage of triode Q1 is connected to the common connection end of resistance R 3 and resistance R 19, collector electrode one end of triode Q1 is connected with resistance R 5 one end, ground connection after the other end series capacitance C10 of resistance R 5, the other end of resistance R 5 is also connected with the collector electrode of triode Q4, the other end of resistance R 5 is also connected with supersonic oscillations circuit, described supersonic oscillations circuit is by piezoelectric ceramic B1, capacitor C 4, capacitor C 6, resistance R 3, capacitor C 1, BU406 generator triode Q3, diode D3, capacitor C 3, inductance L 1, inductance L 2 and inductance L 3 form, and the other end of resistance R 5 is connected to one end of inductance L 1, described inductance L 1, resistance R 3, the BE knot of BU406 generator triode Q3, inductance L 2, inductance L 3 and public negative pole end connect and compose bias current loop successively, described capacitor C 4, piezoelectric ceramic B1, CE knot and the capacitor C 6 of BU406 generator triode Q3 connect and compose charge circuit, described capacitor C 6 successively, diode D3, piezoelectric ceramic B1 and capacitor C 4 connect and compose discharge loop successively, and described capacitor C 3 is for being parallel to the resonant capacitance of load.
The junction voltage of BE knot the utility model employing triode Q4(S8050) is (generally at 0.6-0.7V, the device of different model has some difference, its consistency of the device of same model can be fine) constant-voltage characteristic as an a reference source, when the electric current (cause BU406 generator triode Q3 multiplication factor to rise as temperature rises) for a certain reason making to flow through in resistance R 5 increases, resistance R 5 both end voltage also can proportionally increase, when reaching the conducting voltage of triode Q2 (BE junction voltage), triode Q2 conducting, at resistance R 2 and the tie point of inductance L 1, form a shunting node, the base bias current that is about to inject BU406 generator triode Q3 is diverted to ground by the CE utmost point of triode Q2, the bias current of BU406 generator triode Q3 is reduced, thereby the electric current of the resistance R 5 that makes to flow through reduces, vice versa.The power of permanent power atomization circuit of the present utility model is determined by following formula:
P: the power of atomization circuit;
Vdcin: the direct-current working volts of atomization circuit;
Vbeq2:Q2 is the BE junction voltage (in 0.65 left and right) of S8050;
As can be seen from the above equation, it doesn't matter completely with the multiplication factor of BU406 generator triode Q3 for atomization circuit power, only depend on Vdcin, Vbeq2, R5 resistance value, and these are all constants, so power is able to constant.
The utility model is by adopting technique scheme, and compared with prior art, tool has the following advantages:
1, cast out adjustable resistance, exempt from debugging power, save material cost, save labour turnover again, the loose contact that Du certainly causes due to the existence of adjustable resistance simultaneously, improves the quality of products;
2, amplifier BU406 does not need to distinguish multiplication factor, need not use by stepping, saves artificial stepping and selects cost;
3, due to power invariability, can effectively control temperature rise, prevent the electric leakage problem of leaking that casing deformation causes, improve the fail safe of product.
Accompanying drawing explanation
Fig. 1 is the ultrasonic type humidifier atomization circuit figure of available technology adopting capacitance three-point type self-maintained circuit;
Fig. 2 is the ultrasonic type humidifier atomization circuit figure of available technology adopting CPU mist amount regulative mode;
Fig. 3 is the humidifier atomization circuit figure of the power invariability of embodiment 1;
Fig. 4 is the humidifier atomization circuit figure of the power invariability of embodiment 2.
Embodiment
Now with embodiment, the utility model is further illustrated by reference to the accompanying drawings.
Embodiment 1:
As a specific embodiment, as shown in Figure 3, the humidifier atomization circuit of a kind of power invariability of the present utility model, comprise mist amount control circuit 1, supersonic oscillations circuit 2 and power automatic constant circuit 3, described mist amount control circuit 1 comprises ON-OFF control circuit and DC bias circuit, described ON-OFF control circuit provides power control signal for DC bias circuit, described DC bias circuit provides a suitable bias current for supersonic oscillations circuit 2, described power automatic constant circuit 3 inputs are connected with the negative pole common port of supersonic oscillations circuit 2, described power automatic constant circuit 3 outputs are connected with the output of DC bias circuit, the negative pole common port of described power automatic constant circuit 3 is connected with ON-OFF control circuit negative pole, described power automatic constant circuit 3 inputs are sampled to the operating current of supersonic oscillations circuit 2, sampling after-current signal is carried out to paraphase and amplify rear output error controlled quentity controlled variable, and then the bias current of DC bias circuit output is carried out to flow-dividing control, thereby automatically regulate the bias current of input supersonic oscillations circuit 2, make the operating current in humidifier atomization circuit stable, and then firm power.
Described power automatic constant circuit 3 comprises current sampling circuit, filter circuit and error amplifying circuit, described current sampling circuit consists of resistance R 7, these resistance R 7 one end are connected with the negative pole common port of supersonic oscillations circuit 2, resistance R 7 obtains current sampling signal from the negative pole common port of supersonic oscillations circuit 2, described filter circuit is the integrating circuit consisting of resistance R 6 and capacitor C 7, this current sampling signal obtains current signal after integrating circuit smothing filtering, being formed by triode Q4 of described error amplifying circuit, current signal after integrating circuit smothing filtering adds to the base stage of the triode Q4 of error amplifying circuit, the collector electrode of triode Q4 is connected with DC bias circuit output, the emitter of triode Q4 is connected with ON-OFF control circuit negative pole, triode Q4 carries out paraphase to current signal and amplifies rear output error controlled quentity controlled variable, and then the bias current of DC bias circuit output is carried out to flow-dividing control.
Described ON-OFF control circuit comprises main switch S1, and this switch S 1 is connected to DC power supply DCIN+, and described DC bias circuit is by resistance R 1, resistance R 2 and potentiometer VR1 form, switch S 1 and potentiometer VR1 interlock, after potentiometer VR1 mono-stiff end series resistance R2 and resistance R 1, be connected to switch S 1 one end, the capacitor C 2 that is connected in parallel between described DC bias circuit and supersonic oscillations circuit 2 is carried out filtering, and described supersonic oscillations circuit 2 is by piezoelectric ceramic B1, resistance R 21, capacitor C 4, capacitor C 6, resistance R 3, capacitor C 1, BU406 generator triode Q3, diode D3, capacitor C 3, inductance L 1, inductance L 2 and inductance L 3 form, and described another stiff end of potentiometer VR1 is connected to the collector electrode of diode Q2, and this end is also connected to one end of inductance L 1, described inductance L 1, resistance R 21, resistance R 3, the BE knot of BU406 generator triode Q3, inductance L 2, inductance L 3 and public negative pole end connect and compose bias current loop successively, described capacitor C 4, piezoelectric ceramic B1, the CE knot of BU406 generator triode Q3, inductance L 2, capacitor C 6 connects and composes charge circuit successively, described capacitor C 6, inductance L 2, diode D3, piezoelectric ceramic B1 and capacitor C 4 connect and compose discharge loop successively, and described capacitor C 3 is for being parallel to the resonant capacitance of load.
Shown in figure 3, each components and parts annexation of the humidifier atomization circuit of the power invariability of the present embodiment is as follows: potentiometer VR1 mono-stiff end series resistance R2 is connected with DCIN+ direct voltage with after resistance R 1, another stiff end of potentiometer VR1 is connected with one end of inductance L 1 with the collector electrode of triode Q4 respectively, the other end of inductance L 1 is connected with one end of resistance R 21, the other end first via series capacitance C4 of resistance R 21 with after piezoelectric ceramic B1, be connected with DCIN+ direct voltage, the second tunnel series capacitance C6, inductance L 3 and the rear ground connection of resistance R 5, Third Road series resistance R3 is connected with DCIN+ direct voltage with after capacitor C 1, the B utmost point of BU406 generator triode Q3 is connected with the common connection end of capacitor C 1 with resistance R 3, the C utmost point of BU406 generator triode Q3 is connected with DCIN+ direct voltage, this end also connects the negative electrode of diode D3 simultaneously, the anode of diode D3 is connected with the E utmost point of BU406 generator triode Q3, this end also connects one end of inductance L 2 simultaneously, the other end of inductance L 2 is connected with the common connection end of inductance L 3 with capacitor C 6, this end connects one end of capacitor C 3 simultaneously, the other end of capacitor C 3 is connected with DCIN+ direct voltage, the base stage of triode Q4 is connected with one end of capacitor C 7, and this end is also connected with one end of resistance R 6 simultaneously, the other end ground connection of capacitor C 7, and the other end of resistance R 6 is connected with the common connection end of inductance L 3 with resistance R 7, the grounded emitter of triode Q4.
Shown in figure 3, the operation principle of the humidifier atomization circuit of the power invariability of the present embodiment is as follows:
Main switch S1 is used for controlling the 1 unlatching work of mist amount control circuit or closes, by adjusting the value of potentiometer VR1, regulate bias current, and then the bias current of adjusting BU406 generator triode Q3, realize and regulate fog-supplying amount, when ON-OFF control circuit is opened, switch S 1 is connected, DCIN+ direct voltage is by switch S 1, resistance R 1, resistance R 2, potentiometer VR1(mist amount regulates), inductance L 1, resistance R 21, resistance R 3, the BE knot of BU406 generator triode Q3, inductance L 2, inductance L 3 and GND form bias current, make BU406 generator triode Q3 conducting, now by capacitor C 4 upper ends, piezoelectric ceramic B1(regards a LC loop as atomizing piece B1), the C of BU406 generator triode Q3, the E utmost point, capacitor C 6 lower ends, capacitor C 6 upper ends, capacitor C 4 lower ends form a charge circuit, capacitor C 6 is charged, capacitor C 6 is discharge capacities for capacitor C 4, also be a Bootstrap electric capacity simultaneously, for the lasting conducting of BU406 generator triode Q3 provides electric energy.Along with the lasting charging of capacitor C 6 (lower negative on just), can form a reverse biased at the BE of BU406 generator triode Q3 knot, make BU406 generator triode Q3 transfer cut-off state to by conducting, after BU406 generator triode Q3 cut-off, the voltage at the two ends of capacitor C 6 is lower just upper negative, now diode D3, piezoelectric ceramic B1, capacitor C 4, a discharge loop of capacitor C 6 upper ends formation can be passed through in the upper end of inductance L 1, and now capacitor C 4 charging voltages are lower just upper negative.Continuous electric discharge along with capacitor C 6, at the BE of BU406 generator triode Q3, tying formation reverse biased constantly weakens, final BU406 generator triode Q3 can exit cut-off state, now due to the effect in direct current biasing loop, BU406 generator triode Q3 enters conducting state again from cut-off state again, thereby again repeat above-mentioned process, so go round and begin again and just formed the higher-order of oscillation, the high-frequency current of the higher-order of oscillation becomes direct current after inductance L 3 filtering, right-hand member by inductance L 3 flows to left end, this electric current resistance R 7 of flowing through, in resistance R 7, form suitable voltage drop, formed current sample, after the integrating circuit integration that this current signal forms through resistance R 6 and capacitor C 7, deliver to the base stage of triode Q4, after after triode Q4 paraphase is amplified, produce an error controlled quentity controlled variable, this error controlled quentity controlled variable is exported by the collector electrode of triode Q4, to through resistance R 1, resistance R 2, resistance R 21, the base bias current that resistance R 3 is injected BU406 generator triode Q3 carries out flow-dividing control, thereby stablize the operating current of atomization circuit, because the operating current in humidifier atomization circuit is stable, current stabilization, voltage is also a stationary value, therefore realized the power invariability in humidifier atomization circuit.
Embodiment 2:
The basic circuit structure of the present embodiment 2 is identical with embodiment 1, be that one of its difference is: the ON-OFF control circuit in described mist amount control circuit is processed CPU by central authorities, resistance R 17, triode Q2, resistance R 3, resistance R 19 and 2N5401 triode Q1 form PWM ON-OFF control circuit, described DC bias circuit consists of resistance R 5, the pwm control signal output that central authorities process CPU is connected to resistance R 17, resistance R 17 is connected with the base stage of triode Q2, the grounded emitter of triode Q2, after the collector series resistance R19 of triode Q2 and resistance R 3, be connected to DC power supply DC1N+, this end is also connected with the emitter of triode Q1 simultaneously, the base stage of triode Q1 is connected to the common connection end of resistance R 3 and resistance R 19, collector electrode one end of triode Q1 is connected with resistance R 5 one end, ground connection after the other end series capacitance C10 of resistance R 5, the other end of resistance R 5 is also connected with the collector electrode of triode Q4, the other end of resistance R 5 is also connected with supersonic oscillations circuit 2, described supersonic oscillations circuit 2 is by piezoelectric ceramic B1, capacitor C 4, capacitor C 6, resistance R 3, capacitor C 1, BU406 generator triode Q3, diode D3, capacitor C 3, inductance L 1, inductance L 2 and inductance L 3 form, the other end of resistance R 5 is connected to one end of inductance L 1, the other end of inductance L 1 respectively with one end of resistance R 3, one end of capacitor C 4, and one end of capacitor C 6 connects, the other end of capacitor C 4 is connected with one end of piezoelectric ceramic B1, another termination DC power supply DC1N+ of piezoelectric ceramic B1, the other end of resistance R 3 is connected with the base stage of BU406 generator triode Q3, the other end of capacitor C 6 is connected with one end of inductance L 2 with inductance L 3 respectively, ground connection after one end series resistance R5 of inductance L 3, the other end of inductance L 2 is connected with the emitter of BU406 generator triode Q3, the collector electrode of BU406 generator triode Q3 is connected to DC power supply DC1N+, this end also connects one end of capacitor C 1, the other end of capacitor C 1 is connected with the base stage of BU406 generator triode Q3, the anode of diode D3 is connected with the emitter of BU406 generator triode Q3, the negative electrode of diode D3 is connected to DC power supply DC1N+, this end is also connected with capacitor C 3 one end, capacitor C 3 other ends are connected to the common connection end of inductance L 2 and inductance L 3,
BE knot, inductance L 2, inductance L 3 and the public negative pole end of described inductance L 1, resistance R 3, BU406 generator triode Q3 connect and compose bias current loop successively, CE knot and the capacitor C 6 of described capacitor C 4, piezoelectric ceramic B1, BU406 generator triode Q3 connect and compose charge circuit successively, described capacitor C 6, diode D3, piezoelectric ceramic B1 and capacitor C 4 connect and compose discharge loop successively, and described capacitor C 3 is for being parallel to the resonant capacitance of load.
Shown in figure 4, its operation principle of humidifier atomization circuit of the power invariability of the present embodiment 2 is: when humidifier is opened, central processor CPU output high level, triode Q2(S8050), triode Q1(2N5401) conducting, DCIN+ direct voltage is by triode Q1(2N5401) E, the C utmost point, flow through resistance R 5, inductance L 1, resistance R 3, the BE knot of BU406 generator triode Q3, inductance L 2, inductance L 3 and GND form bias current, make BU406 generator triode Q3 conducting, now by capacitor C 4 upper ends, piezoelectric ceramic B1(regards a LC loop as atomizing piece B1), the C of BU406 generator triode Q3, the E utmost point, capacitor C 6 right-hand members, capacitor C 6 left ends, capacitor C 4 lower ends form a discharge loop, also capacitor C 6 is charged simultaneously, capacitor C 6 is discharge loops for capacitor C 4, also be a Bootstrap electric capacity simultaneously, for the lasting conducting of BU406 generator triode Q3 provides electric energy.Along with the lasting charging of capacitor C 6 (the left negative right side just), can form a reverse biased at the BE of BU406 generator triode Q3 knot, make BU406 generator triode Q3 transfer cut-off state to by conducting, after BU406 generator triode Q3 cut-off, the voltage at the two ends of capacitor C 6 is that the right side is just being born in a left side, now the right-hand member of capacitor C 6 can pass through diode D3, piezoelectric ceramic B1, capacitor C 4, a discharge loop of capacitor C 6 left ends formation, and now capacitor C 4 charging voltages are upper just lower negative.Continuous electric discharge along with capacitor C 6, at the BE of BU406 generator triode Q3, tying formation reverse biased constantly weakens, final BU406 generator triode Q3 can exit cut-off state, now due to the effect in direct current biasing loop, BU406 generator triode Q3 enters conducting state again from cut-off state again, thereby again repeat above-mentioned process, so go round and begin again and just formed the higher-order of oscillation.Mist amount control circuit carries out corresponding adjusting to mist amount, specifically by DC bias circuit, regulate the bias current of BU406 generator triode Q3 to realize, when if PWM duty ratio equals 0%, close completely, at this moment equal to have closed mist, if when duty ratio is 100%, mist amount is maximum, if duty ratio is between 0%-100%, mist amount, also between minimum and maximum, just can be controlled fog-supplying amount and whether go out mist as long as controlled duty ratio simultaneously so.Described DC bias circuit consists of resistance R 5, and DC bias circuit provides a suitable bias current to BU406 generator triode Q3, adjusts the value of potentiometer VR1 and can finely tune bias current size.
High-frequency current becomes direct current after inductance L 3 filtering, by the right-hand member of inductance L 3, flows to left end, and this electric current resistance R 7 of flowing through forms suitable voltage drop in resistance R 7, has formed current sample; After the integrating circuit integration that this current signal forms through resistance R 7 and capacitor C 7, deliver to the base stage of triode Q4, after triode Q4 amplifies, producing a controlled quentity controlled variable is exported by the collector electrode of triode Q4, to injecting the base bias current of BU406 generator triode Q3, carry out flow-dividing control, thereby stablize the operating current of atomization circuit.Because the operating current in humidifier atomization circuit is stable, current stabilization, voltage is also a stationary value, has therefore realized the power invariability in humidifier atomization circuit.
In sum, by embodiment 1 and embodiment 2, can be found out, all adopt triode Q4(S8050) the junction voltage of BE knot (generally at 0.6-0.7V, the device of different model has some difference, its consistency of the device of same model can be fine) constant-voltage characteristic as an a reference source, when the electric current (cause BU406 generator triode Q3 multiplication factor to rise as temperature rises) for a certain reason making to flow through in resistance R 7 increases, resistance R 7 both end voltage also can proportionally increase, when reaching the conducting voltage of triode Q4 (BE junction voltage), triode Q4 conducting, at resistance R 2(or R5) form a shunting node with the tie point of inductance L 1, the base bias current that is about to inject BU406 generator triode Q3 is diverted to ground by the CE utmost point of triode Q4, the bias current of BU406 generator triode Q3 is reduced, thereby the electric current of the resistance R 7 that makes to flow through reduces, vice versa.
Therefore the power of permanent power atomization circuit of the present utility model is determined by following formula:
P: the power of atomization circuit;
Vdcin: the direct-current working volts of atomization circuit;
Vbeq2:Q2 is the BE junction voltage (in 0.65 left and right) of S8050;
As can be seen from the above equation, it doesn't matter completely with the multiplication factor of BU406 generator triode Q3 for atomization circuit power, only depend on Vdcin, Vbeq2, R7 resistance value, and these are all constants, so power is able to constant.
Although specifically show and introduced the utility model in conjunction with preferred embodiment; but those skilled in the art should be understood that; within not departing from the spirit and scope of the present utility model that appended claims limits; can make a variety of changes the utility model in the form and details, be protection range of the present utility model.
Claims (5)
1. the humidifier atomization circuit of a power invariability, it is characterized in that: comprise mist amount control circuit, supersonic oscillations circuit and power automatic constant circuit, described mist amount control circuit comprises ON-OFF control circuit and DC bias circuit, described ON-OFF control circuit provides power control signal for DC bias circuit, described DC bias circuit provides a suitable bias current for supersonic oscillations circuit, described power automatic constant circuit input is connected with the negative pole common port of supersonic oscillations circuit, described power automatic constant circuit output is connected with the output of DC bias circuit, the negative pole common port of described power automatic constant circuit is connected with ON-OFF control circuit negative pole, described power automatic constant circuit input is sampled to the operating current of supersonic oscillations circuit, sampling after-current signal is carried out to paraphase and amplify rear output error controlled quentity controlled variable, and then the bias current of DC bias circuit output is carried out to flow-dividing control, thereby automatically regulate the bias current of input supersonic oscillations circuit, make the operating current in humidifier atomization circuit stable, and then firm power.
2. the humidifier atomization circuit of a kind of power invariability according to claim 1, it is characterized in that: described power automatic constant circuit comprises current sampling circuit, filter circuit and error amplifying circuit, current sampling circuit input is connected with the negative pole common port of supersonic oscillations circuit, the output of circuit sample circuit is connected with filter circuit input, filter circuit output be connected with error amplifying circuit signal input part, error amplifying circuit signal output part is connected with DC bias circuit output, the negative pole common port of error amplifying circuit is connected with ON-OFF control circuit negative pole.
3. the humidifier atomization circuit of a kind of power invariability according to claim 2, it is characterized in that: described current sampling circuit consists of resistance R 7, these resistance R 7 one end are connected with the negative pole common port of supersonic oscillations circuit, resistance R 7 obtains current sampling signal from the negative pole common port of supersonic oscillations circuit, described filter circuit is the integrating circuit consisting of resistance R 6 and capacitor C 7, this current sampling signal obtains current signal after integrating circuit smothing filtering, being formed by triode Q4 of described error amplifying circuit, current signal after integrating circuit smothing filtering adds to the base stage of the triode Q4 of error amplifying circuit, the collector electrode of triode Q4 is connected with DC bias circuit output, the emitter of triode Q4 is connected with ON-OFF control circuit negative pole, triode Q4 carries out paraphase to current signal and amplifies rear output error controlled quentity controlled variable, and then the bias current of DC bias circuit output is carried out to flow-dividing control.
4. the humidifier atomization circuit of a kind of power invariability according to claim 3, is characterized in that: described ON-OFF control circuit comprises main switch S1, and this switch S 1 is connected to DC power supply DCIN+, and described DC bias circuit is by resistance R 1, resistance R 2 and potentiometer VR1 form, switch S 1 and potentiometer VR1 interlock, after potentiometer VR1 mono-stiff end series resistance R2 and resistance R 1, be connected to switch S 1 one end, the capacitor C 2 that is connected in parallel between described DC bias circuit and supersonic oscillations circuit is carried out filtering, and described supersonic oscillations circuit is by piezoelectric ceramic B1, resistance R 21, capacitor C 4, capacitor C 6, resistance R 3, capacitor C 1, BU406 generator triode Q3, diode D3, capacitor C 3, inductance L 1, inductance L 2 and inductance L 3 form, and described another stiff end of potentiometer VR1 is connected to the collector electrode of diode Q2, and this end is also connected to one end of inductance L 1, described inductance L 1, resistance R 21, resistance R 3, the BE knot of BU406 generator triode Q3, inductance L 2, inductance L 3 and public negative pole end connect and compose bias current loop successively, described capacitor C 4, piezoelectric ceramic B1, the CE knot of BU406 generator triode Q3, inductance L 2, capacitor C 6 connects and composes charge circuit successively, described capacitor C 6, inductance L 2, diode D3, piezoelectric ceramic B1 and capacitor C 4 connect and compose discharge loop successively, and described capacitor C 3 is for being parallel to the resonant capacitance of load.
5. the humidifier atomization circuit of a kind of power invariability according to claim 3, is characterized in that: described ON-OFF control circuit is processed CPU by central authorities, resistance R 17, triode Q2, resistance R 3, resistance R 19 and 2N5401 triode Q1 form PWM ON-OFF control circuit, described DC bias circuit consists of resistance R 5, the pwm control signal output that central authorities process CPU is connected to resistance R 17, resistance R 17 is connected with the base stage of triode Q2, the grounded emitter of triode Q2, after the collector series resistance R19 of triode Q2 and resistance R 3, be connected to DC power supply DC1N+, this end is also connected with the emitter of triode Q1 simultaneously, the base stage of triode Q1 is connected to the common connection end of resistance R 3 and resistance R 19, collector electrode one end of triode Q1 is connected with resistance R 5 one end, ground connection after the other end series capacitance C10 of resistance R 5, the other end of resistance R 5 is also connected with the collector electrode of triode Q4, the other end of resistance R 5 is also connected with supersonic oscillations circuit, described supersonic oscillations circuit is by piezoelectric ceramic B1, capacitor C 4, capacitor C 6, resistance R 3, capacitor C 1, BU406 generator triode Q3, diode D3, capacitor C 3, inductance L 1, inductance L 2 and inductance L 3 form, and the other end of resistance R 5 is connected to one end of inductance L 1, described inductance L 1, resistance R 3, the BE knot of BU406 generator triode Q3, inductance L 2, inductance L 3 and public negative pole end connect and compose bias current loop successively, described capacitor C 4, piezoelectric ceramic B1, CE knot and the capacitor C 6 of BU406 generator triode Q3 connect and compose charge circuit, described capacitor C 6 successively, diode D3, piezoelectric ceramic B1 and capacitor C 4 connect and compose discharge loop successively, and described capacitor C 3 is for being parallel to the resonant capacitance of load.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105126212A (en) * | 2015-10-12 | 2015-12-09 | 王天星 | Adjustable atomization circuit and control method |
| CN105195373A (en) * | 2015-10-20 | 2015-12-30 | 珠海格力电器股份有限公司 | Ultrasonic atomizer |
| CN105763098A (en) * | 2015-01-07 | 2016-07-13 | 合世生医科技股份有限公司 | Method for providing power invariability through automatic compensation, and atomization module |
| CN109150159A (en) * | 2018-10-08 | 2019-01-04 | 广州厚达电子科技有限公司 | The ultrasonic ultrasonic delay line memory driving circuit and driving method of Low-voltage Low-power |
| CN111397172A (en) * | 2019-12-02 | 2020-07-10 | 佛山市和瑞泰智能科技有限公司 | Spring water detection circuit for humidifier, double-dry-burning protection circuit and working method |
| CN113101521A (en) * | 2021-05-21 | 2021-07-13 | 四川步歌科技有限公司 | Pain therapeutic instrument |
| CN113426651A (en) * | 2021-05-21 | 2021-09-24 | 四川步歌科技有限公司 | Ultrasonic circuit and pain therapeutic apparatus comprising same |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105763098A (en) * | 2015-01-07 | 2016-07-13 | 合世生医科技股份有限公司 | Method for providing power invariability through automatic compensation, and atomization module |
| CN105126212A (en) * | 2015-10-12 | 2015-12-09 | 王天星 | Adjustable atomization circuit and control method |
| CN105195373A (en) * | 2015-10-20 | 2015-12-30 | 珠海格力电器股份有限公司 | Ultrasonic atomizer |
| CN105195373B (en) * | 2015-10-20 | 2017-12-29 | 珠海格力电器股份有限公司 | A kind of ultrasonic ultrasonic delay line memory |
| CN109150159A (en) * | 2018-10-08 | 2019-01-04 | 广州厚达电子科技有限公司 | The ultrasonic ultrasonic delay line memory driving circuit and driving method of Low-voltage Low-power |
| CN111397172A (en) * | 2019-12-02 | 2020-07-10 | 佛山市和瑞泰智能科技有限公司 | Spring water detection circuit for humidifier, double-dry-burning protection circuit and working method |
| CN113101521A (en) * | 2021-05-21 | 2021-07-13 | 四川步歌科技有限公司 | Pain therapeutic instrument |
| CN113426651A (en) * | 2021-05-21 | 2021-09-24 | 四川步歌科技有限公司 | Ultrasonic circuit and pain therapeutic apparatus comprising same |
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