CN2375030Y - D. C. brushless fan driving circuit - Google Patents
D. C. brushless fan driving circuit Download PDFInfo
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- CN2375030Y CN2375030Y CN98207525U CN98207525U CN2375030Y CN 2375030 Y CN2375030 Y CN 2375030Y CN 98207525 U CN98207525 U CN 98207525U CN 98207525 U CN98207525 U CN 98207525U CN 2375030 Y CN2375030 Y CN 2375030Y
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Abstract
The utility model relates to a driving circuit for a direct current brushless fan, which comprises an amplifying comparison circuit, a pulse wave generator and four sets of transistors, wherein, the four sets of transistors are respectively connected with the output ends of the pulse wave generator. The input end of the pulse wave generator is respectively connected with a signal input end and the amplifying comparison circuit through a multiplexer, and an input control circuit which is arranged between the multiplexer and the signal input end is used for judging whether the signal input end is connected with a hall IC or a hall inductor. The signal input end can be controlled by the multiplexer to be directly connected with the hall IC or connected with the hall inductor through the amplifying comparison circuit, and accordingly, the utility model can be respectively suitable for the hall IC or the hall inductor. Each of the transistors is composed of a metal-oxide semiconductor field-effect transistor, and a naturally formed parasitic diode node can solve the obsession of an external diode.
Description
The utility model relates to the driving circuit device of a kind of mechanical engineering ventilation field apparatus of air conditioning, particularly relate to a kind of application Hall IC or hall sensor as sensing element, utilize parasitism two utmost points knot that forms on the mos field effect transistor to prevent that surging from destroying again, and the phase driven signal is stagger folded mutually heavy kenel, and can reduce the brush DC fan drive circuit of energy loss and heat.In addition, the hysteresis characteristic that this drive circuit more can utilize comparator to produce is disturbed and can get rid of noise, guarantees to survey accuracy of action.
Existing traditional brush DC fan is to utilize two groups of stator coils, the two produces anti-phase each other magnetic field respectively by it, drive the running of wind rotor, see also as shown in Figure 9, be to use the fan drive circuit of two groups of stator coils, it includes a Hall IC 70, two 71,72 and two groups of stator coil L1, L2 etc. that are serially connected with two transistor 71,72 respectively of transistor that are connected in series mutually; Its working method is to make transistor 71 conductings and make stator coil L1 excitatory, and then make the rotor rotation one suitable angle that is provided with flabellum, at the same time, the changes of magnetic field when Hall IC 70 turns round inductiopn rotor is sent high low-potential signal immediately, make the transistor 71 of original conducting end, 72 relative conductings of another transistor change by another stator coil L2 excitatoryly, make rotor rotation one suitable angle again, alternately excitatory by two groups of stator coil L1, L2 so circularly, and drive fan continues to rotate.
Yet, use the cost of two groups of stator coils higher simultaneously, and coil takes up room, so industry reaches after the feasibility of using single coil, but aforementioned existing traditional fan drive circuit only can drive two groups of coils, can't be in order to drive single coil.See also as shown in figure 10, United States Patent (USP) then disclosed for No. 5289089 a kind of can be respectively in order to driving the brush DC fan drive circuit of single coil or twisted pair line circle, it includes the pulse generator 3 that a hall sensor 1, an amplifying circuit that is connected with hall sensor 12, are connected in amplification circuit output end; These pulse generator 3 outputs divide two groups of anti-phase each other driver elements 11,12 again, wherein a driver element 11 is made up of transistor Q1～Q3, Q8,12 of another driver elements are made up of transistor Q4～Q7, wherein the transistor Q7 of the transistor Q3 of driver element 11 and another driver element 12 is connected with diode D1, D2 respectively between collector electrode, emitter, and on emitter, constitute contact 6,7 respectively, to be connected with coil 10 respectively.
Aforesaid drive circuit is to produce set of pulses ripple by pulse generator 3, make a driver element 11 conductings, and make electric current pass through coil 10 rotary rotors, at the same time, another driver element 12 is cut off, when aforementioned rotor rotation, will produce changes of magnetic field, satisfy by hall sensor 1 and elicited and outputs level signals, after amplifying, amplifying circuit 2 delivers to the impulse wave phase place that pulse generator 3 changes output, and change by organizing driver element 12 conductings separately, this moment, the sense of current of flowing through coil 10 changed, and made rotor rotate an angle again, so driven makes the fan propeller continuous running.
In aforesaid circuit, can also can drive the twisted pair line circle in order to drive the single coil 10 as shown, it is to make an end of two groups of coils be connected to respectively on the contact 6,7, coil end in addition is connected on the power supply VCC again, can reach the purpose of two groups of coils of control.
When being used to drive single coil with aforesaid brush-less fan drive circuit, can solve shortcomings such as twin coil brush-less fan volume is big, cost height, when being used to again drive the twisted pair line circle, then can solve the shortcoming that existing traditional twin coil drive circuit can't drive single coil.But, can find that then it still should have room for improvement through further probing into its circuit structure:
1, only can use hall sensor as detecting element:
Existing Hall element includes two kinds of hall sensor and Hall IC, and the former only has the detection sensor function, and its output signal must be carried out processing and amplifying through amplifying circuit, just can deliver to the usefulness that subsequent conditioning circuit is made for judgement; The latter then belongs to the IC form, and itself promptly possesses signal processing function, and output signal can directly supply the usefulness of interpretation.
In aforesaid United States Patent (USP) case, its Hall element that uses is hall sensor 1, so its output signal must just can be delivered to pulse generator 3 and carry out interpretation through after amplifying circuit 2 make processing and amplifying.Because this case is directly established with amplifying circuit 2 in the input inboard, so this circuit is unsuitable for using Hall IC, in other words, when aforesaid United States Patent (USP) case desire adopts Hall IC as detecting element, promptly must revise its circuit structure, and manufacture another kind of IC could be for it, and this kind practice obviously lacks economic benefit.
2, circuit constituting element is not simplified to the greatest extent:
Aforesaid circuit is connected with a diode D1, D2 respectively between the collector electrode of the transistor Q7 of the transistor Q3 of a driver element 11 and another driver element 12, emitter, it mainly is to produce the surging noise when avoiding the transistor transition or punctured by surging.Aforesaid transistor Q3, Q7 are alternately sexual act, when one of them by conducting moment transition for by the time, to on coil 10, produce induced electromotive force and cause surging simultaneously, this surging is if fail to be eliminated, gently then shorten the transistorized life-span, heavy then will have breakdown transistors to cause immediately the possibility of damaging.And aforesaid United States Patent (USP) case connects the electromotive force current potential that produces when the main purpose of diode D1, D2 promptly is to dredge the transistor transition on coil 10 between the collector electrode of transistor Q3, Q7, emitter, with the surging of effectively preventing.Though and the setting of diode D1, D2 can avoid surging for transistorized impact effectively, but because diode D1, D2 element for additionally installing additional, when aforesaid drive circuit is made integrated circuit, not only will cause the complicated degree that increases technology, and will improve manufacturing cost.
3, useful life is short:
Cause heating of brush-less fan drive circuit and the reason of reduction of service life to be easily, its set many group transistors are to do the continuous alternating conducting, because electronic component delay phenomenon may occur when transition, when a transistor by being conducting to when delay phenomenon takes place, when representing that promptly the one transistor does not end fully, the transistor of organizing separately that then replaces relatively promptly begins conducting, this phenomenon not only will cause short circuit problem and element heating, also element itself is produced directly simultaneously and impact, and will shorten its useful life.
4, power loss is big:
Existing traditional single-phase motor drive circuit is that transistor is integrated in the integrated circuit, because in most transistor fabrication, the PNP transistor can't present mostly than the better characteristic of NPN transistor, therefore in the aforesaid U.S. Patent case, two NPN transistor Q3 have been used, Q7 is as driving stage, yet transistor Q2, Q3 and transistor Q6, Q7 power supply VCC and 6,7 of outputs have respectively about 1 volt pressure drop (VBE Q3+VCE Q2, VBE Q7+VCE Q6), therefore will cause bigger power loss and heat energy (P=VI).
5, be subject to noise and disturb misoperation possibility height:
Hall sensor in the aforesaid U.S. Patent case, its polar signal of responding to are delivered to pulse generator immediately and are carried out interpretation after amplifying circuit is made processing and amplifying, owing to without any anti-error measure, disturb and the generation misoperation so very be subject to external noise.
From the above, can't be suitable for the problem that drives single group and twisted pair line circle and surging breakdown transistors, yet on circuit structure and operating characteristic, still have not most thorough part, so be further improved though the aforesaid U.S. Patent case can solve existing conventional ADS driving circuit.
Because the defective that above-mentioned existing brush DC fan drive circuit exists, the design people is based on abundant practical experience and professional knowledge, through constantly studying, design, and after studying sample repeatedly and improving, creates the utility model finally.
Main purpose of the present utility model is, overcome the defective that existing brush DC fan drive circuit exists, and provide a kind of Hall IC or hall sensor of can being suitable for respectively as sensing element, parasitism two utmost points knot that utilizes mos field effect transistor to form naturally again prevents that directly surging from destroying, and there is not the burden of external diode, again with non-overlapped pulse wave signal driving transistors, can avoid delay phenomenon to cause transistor conducting simultaneously and the brush DC fan drive circuit of the detecting automatically of derive heating and energy loss problem.
The purpose of this utility model is realized by following technical scheme.According to a kind of brush DC fan drive circuit that the utility model proposes, it is characterized in that it includes one and amplifies comparison circuit, a pulse generator, four groups of transistors that are connected with the pulse generator output respectively etc., wherein: this pulse generator, its input is to amplify comparison circuit with signal input part and respectively by a multiplexer to be connected, and is provided with an input control circuit again between this multiplexer and signal input part; This input control circuit is in order to judge that signal input part for connecting Hall IC or hall sensor, is connected or is connected with hall sensor indirectly by amplifying comparison circuit and pass through multiplexer switch pulse baud generator input Hall IC direct and on the signal input part.
The purpose of this utility model can also further realize by following technical measures.
Aforesaid brush DC fan drive circuit, wherein said input control circuit can be made of an inverter, this multiplexer is made up of two electronic switches, this inverter wherein, its input is connected with an end of signal input part, its output is connected with two electronic switches of multiplexer through another inverter, and two electronic switches are connected in the input of pulse generator jointly with a contact, and another contact is connected to the end in addition of signal input part and amplification ratio than circuit output end.
Aforesaid brush DC fan drive circuit, wherein said input control circuit are a low state switching points inverter.
Aforesaid brush DC fan drive circuit, wherein said each group transistor is to be made of mos field effect transistor, it will form parasitism two utmost points knot of an equivalence naturally in semiconductor fabrication between source electrode, drain electrode, with the surging of elimination transistor transition generation.
Aforesaid brush DC fan drive circuit, each group pulse ripple signal of wherein said its output of pulse generator are all at a distance of for the moment poor and be discontinuous state, to prevent the conducting simultaneously of each group transistor.
Aforesaid brush DC fan drive circuit, wherein said amplification comparison circuit includes an amplifier and a comparator, and this comparator produces hysteresis characteristic, gets rid of noise and disturbs, and guarantees to survey accuracy of action.
The utility model compared with prior art has tangible advantage and good effect.By above technical scheme as can be known, the utility model mainly is to use Hall IC or hall sensor as sensing element, utilize parasitism two utmost points knot that forms on the mos field effect transistor to prevent that surging from destroying again, and the phase driven signal is stagger folded mutually heavy kenel, and can reduce the brush DC fan drive circuit of energy loss and heat.In addition, the hysteresis characteristic that this drive circuit more can utilize comparator to produce is disturbed and can get rid of noise, guarantees to survey accuracy of action.Owing to the utlity model has the circuit structure of above-mentioned novel structure design, and, make the utility model have following advantage at least by its operating characteristic and manner of execution:
1, applicable Hall IC or hall sensor are as the magnetic pole detecting element:
It is to connect Hall IC or hall sensor that the utility model utilizes the automatic detectable signal input of an input control circuit, and cooperate and to be provided with that a multiplexer switches pulse generator to select directly and the Hall IC on the signal input part is connected, or be connected with hall sensor on the signal input part through amplifying comparison circuit, whereby, can be applicable to Hall IC or hall sensor as the magnetic pole detecting element by same circuit, and can reduce use cost effectively.
2, can simplify circuit structure and processing procedure:
The utility model is to utilize the mos field effect transistor drive coil, because being nature, mos field effect transistor between source electrode, drain electrode, produces parasitic two utmost points knot in manufacture of semiconductor, so the utility model need not add diode on transistor, can dredge the surging that produces when eliminating the transistor transition, can reduce the number of elements of circuit whereby effectively, and can simplify processing procedure, reduce cost.
Moreover, because the transistor that adopts mos field effect transistor to use as power controlling, it removes the power dissipation concerns can avoid NPN transistor, has also solved the problem that can't obtain ideal characterisitics if use that the PNP transistor then may be subject to technology instead simultaneously.
3, guarantee that the circuit operate as normal increases the service life:
The non-overlapped impulse wave that the utility model pulse generator produces be between turn-on cycle and the turn-on cycle that continues one time difference of generation, produce delay phenomenon when preventing the transistor transition, cause the conducting simultaneously of two group transistors, and can guarantee the operate as normal of circuit effectively, increase the service life.
4, can effectively prevent misoperation:
The present invention is provided with comparator in amplifying comparison circuit, it can utilize hysteresis characteristic that the hall sensing signal of input is compared, and disturbs to get rid of noise, and can guarantee to survey accuracy of action.
In sum, the utility model respectively with Hall IC or hall sensor as sensing element, parasitism two utmost points knot that utilizes mos field effect transistor to form naturally again prevents that directly surging from destroying, and there is not the burden of external diode, with non-overlapped pulse wave signal driving transistors, can avoid delay phenomenon to cause transistor conducting simultaneously and the problem of derive heating and energy loss again.No matter it structurally or bigger improvement is all arranged on the function, and have than much progress technically, and produced handy and practical effect, and have the enhancement effect really, thereby be suitable for practicality more, really is a new and innovative, progressive, practical new design.
Concrete structure of the present utility model is provided in detail by following examples and accompanying drawing thereof.
Fig. 1 is a circuit diagram of the present utility model.
Fig. 2 is the circuit diagram of input control circuit one preferred embodiment of the present utility model.
Fig. 3 is that the utility model adopts the embodiment circuit diagram of hall sensor as detecting element.
Fig. 4 is that the utility model adopts the embodiment circuit diagram of Hall IC as detecting element.
Fig. 5 is the working waveform figure that pulse generator of the present utility model produces discontinuous signal.
Fig. 6 is the equivalent circuit diagram of drive part of the present utility model.
Fig. 7 is the structure cutaway view of mos field effect transistor.
Fig. 8 is the equivalent circuit diagram that the utility model is used to drive the twisted pair line circle.
Fig. 9 is the line map of existing traditional type brush DC fan drive circuit.
Figure 10 is the circuit diagram of No. 5289089 case of United States Patent (USP).
Below in conjunction with accompanying drawing and preferred embodiment, to according to its concrete structure of brush DC fan drive circuit, feature and the effect thereof that the utility model proposes, describe in detail as after.
See also shown in Figure 1, the utility model brush DC fan drive circuit, it includes one and amplifies comparison circuit 20, a pulse generator 30, four groups of transistor Q1～Q4 that are connected with pulse generator 30 outputs respectively etc., wherein:
This amplifies comparison circuit 20, is made up of an amplifier 21 and a comparator 22, and wherein two inputs of amplifier 21 are connected with signal input part H+, H-respectively, and this signal input part H+, H-are in order to connect hall sensor or Hall IC as Hall element.
This pulse generator 30, its input are to be connected with the output of signal input part H-and amplification comparison circuit 20 respectively by a multiplexer 40; This multiplexer 40 is that to be subjected to an input control circuit 50 control to decide pulse generator 30 inputs are the outputs that are connected directly to signal input part H-or amplify comparison circuit 20.
Aforementioned again input control circuit 50 is to be connected in 40 of an end H+ of signal input part and multiplexers, borrows the level of surveying this signal input part H+ height, judges that the Hall element of signal input part H+, the last connection of H-is hall sensor or Hall IC.
Concrete structure as for input control circuit 50 and multiplexer 40 sees also shown in Figure 2, wherein input control circuit 50 is made of a low state switching points inverter 51, multiplexer 40 is mainly by two groups of electronic switches 41 again, 42 form, wherein low state switching points inverter 51 inputs are to be connected with signal input part H+, its output is then through an inverter 43 and two electronic switches 41,42 connect, two electronic switches 41, the 42nd, be connected in the input of pulse generator 30 jointly with a tip node, it is tip node output of then being connected to signal input part H-and amplifying comparison circuit 20 in addition:
See also shown in Figure 3, when being when connecting Hall IC 52 on signal input part H+, the H-as detecting element, signal input part H+ is connected in earth terminal (GND), so low state switching points inverter 51 is obtained a zero level (still seeing also shown in Figure 2) through signal input part H+, should be high level by low state switching points inverter 51 outputs this moment, and make a wherein electronic switch 41 conductings, make pulse generator 30 inputs be connected, obtain the magnetic field induction signal by electronic switch 41 Hall IC 52 direct and on the signal input part H-.At this moment, another electronic switch 42 cuts out simultaneously, is to be open-circuit condition so amplify the output and 30 of the pulse generators of comparison circuit 20.
Please consult shown in Figure 4 again, as signal input part H+, be when connecting hall sensor 53 on the H-as detecting element, this hall sensor 53 is to be connected to signal input part H+ with two outputs, H-, therefore, low state switching points inverter 51 will be obtained a high level (still seeing also shown in Figure 2) by signal input part H+, this moment, low state switching points inverter 51 outputs were low level, and make a wherein electronic switch 42 conductings, the input that makes pulse generator 30 is through electronic switch 42, amplify comparison circuit 20 and signal input part H+, hall sensor 53 on the H-connects, and obtains the magnetic field induction signal.At this moment, another electronic switch 41 is closed.
And for the level state of 53 outputs of interpretation hall sensor effectively, then adopt this low state switching points inverter 51 make its beyond zero level than can being judged as high level under the low level state, and then give transition.
Therefore from the above, utilize this input control circuit 50 to cooperate the change action of multiplexer 40, can make aforementioned brush-less fan drive circuit can be applicable to respectively that Hall IC or hall sensor are as the polarity of the magnetic field detecting element.
See also shown in Figure 1 again, each output of this pulse generator 30 is the grid that is connected in transistor Q1～Q4 respectively through an inverter, this each transistor Q1～Q4 is made of mos field effect transistor, wherein, this transistor Q1, Q2 are PMOS, transistor Q3, Q4 then are NMOS, wherein the contact of transistor Q1, Q3 and transistor Q2, Q4 constitutes output O1, O2 respectively, circuit is when being used to drive single group coil 54 as described above, and this single group coil 54 promptly is connected between this two output O1, O2.
Aforesaid again pulse generator 30 is to drive aforementioned four group transistor Q1～Q4 respectively with non-overlapped pulse wave signal, see also shown in Figure 5, the pulse wave signal of driving transistors Q3, Q4 is to be non-overlapped state when high level, the pulse wave signal of driving transistors Q1, Q2 is to be non-overlapped state when low level again, in other words, this Q3, Q4 output pulse wave signal is under high level state, be formed with a suitable time difference Δ T between turn-on cycle T1 and another turn-on cycle T2 that continues, so as to preventing the conducting simultaneously of two group transistors.And Q1, Q2 output pulse wave signal is under low level state, also is formed with a suitable time difference Δ t between turn-on cycle t1 and another turn-on cycle t2 of continuing, so as to preventing the while conducting of two group transistors.
Its concrete circuit operation sees also shown in Figure 6, when transistor Q3 conducting, transistor Q1 on the same group ends, when finishing, the turn-on cycle T1 of transistor Q3 will produce a time difference Δ T, the generation turn-on cycle T2 that just continues makes and organizes transistor Q4 conducting separately, because two turn-on cycle T1, there is time difference Δ T between T2, even occur delay phenomenon during event Q3 transition, also there are not Yu Fasheng two group transistor Q1, Q3 and Q2, the short-circuit state of Q4 conducting simultaneously, as for forming between two signals under discrete kenel, the problem that may cause power output to reduce slightly, yet the utility model is a fan product, because of no heavy duty, so on reality is used, and any puzzlement of unlikely generation.
Moreover, aforementioned each group transistor Q1～Q4 between its source electrode, drain electrode not beyond add mode connect with diode, but form the surgings that electromotive force caused because of coil 54 still can eliminate transition the time.Because transistor Q1～Q4 is made of mos field effect transistor, in manufacture process, promptly produce parasitic two a utmost points knot D1～D4 (seeing also shown in Fig. 7 PMOS and the NMOS structure cutaway view) between its source electrode, drain electrode naturally, therefore, transistor Q1～Q4 need not add diode in addition, the surging current potential that produces on coil 54 in the time of can be with transition is eliminated, so as to the noise problem that prevents the surging breakdown transistors and derive.
Aforesaid transistor Q1, Q2 are the mos field effect transistor of P passage in addition, and it has only very little pressure drop (the about 0.2V of VDS) between power supply and output O1, O2, and its power loss is very little, can prevent effectively that circuit temperature from raising.Because the dark temperature influence of detectivity of hall sensor, in the past under the situation that circuit temperature can't effectively be controlled, and be not suitable for hall sensor is integrated in the same integrated circuit, the present invention now overcomes temperature problem effectively, so hall sensor can be integrated in the same integrated package with drive circuit.
And can reduce the number of elements of circuit effectively with aforementioned structural design, its integrated processing procedure is more become merely, and can reduce manufacturing cost effectively.
Can find out detailed circuit structure of the present utility model and operation principle by above-mentioned explanation, in last embodiment, be that to be used to drive single group coil with the utility model be that example describes, and except single group coil, the utility model also can be used for driving the twisted pair line circle, see also shown in Figure 8, be that the utility model is in order to drive the circuit diagram of twisted pair line circle, these two groups of coil L1, L2 is the two output O1 that are connected to each group transistor Q1～Q4 contact place with an end, on the O2, it is held in addition and then is connected to power end (VDD), with ending, make two groups of coil L1 by the alternate conduction of two group transistor Q1/Q4 and transistor Q2/Q3, L2 replaces excitatory and conversion stator polarity.
The above, it only is preferred embodiment of the present utility model, be not that the utility model is done any pro forma restriction, every foundation technical spirit of the present utility model all still belongs in the scope of technical solutions of the utility model any simple modification, equivalent variations and modification that above embodiment did.
Claims (6)
1, a kind of brush DC fan drive circuit is characterized in that it includes one and amplifies comparison circuit, a pulse generator, four groups of transistors that are connected with the pulse generator output respectively etc., wherein:
This pulse generator, its input are to amplify comparison circuit with signal input part and respectively by a multiplexer to be connected, and are provided with an input control circuit again between this multiplexer and signal input part;
This input control circuit is in order to judge that signal input part for connecting Hall IC or hall sensor, is connected or is connected with hall sensor indirectly by amplifying comparison circuit and pass through multiplexer switch pulse baud generator input Hall IC direct and on the signal input part.
2, brush DC fan drive circuit according to claim 1, it is characterized in that described input control circuit can be made of an inverter, this multiplexer is made up of two electronic switches, this inverter wherein, its input is connected with an end of signal input part, its output is connected with two electronic switches of multiplexer through another inverter, two electronic switches are connected in the input of pulse generator jointly with a contact, and another contact is connected to the end in addition of signal input part and amplification ratio than circuit output end.
3, brush DC fan drive circuit according to claim 2 is characterized in that described input control circuit is a low state switching points inverter.
4, brush DC fan drive circuit according to claim 1, it is characterized in that described each group transistor is to be made of mos field effect transistor, it will form parasitism two utmost points knot of an equivalence naturally in semiconductor fabrication between source electrode, drain electrode, with the surging of elimination transistor transition generation.
5, brush DC fan drive circuit according to claim 1, each the group pulse ripple signal that it is characterized in that described its output of pulse generator are all at a distance of poor and be discontinuous state for the moment, to prevent the conducting simultaneously of each group transistor.
6, brush DC fan drive circuit according to claim 1 is characterized in that described amplification comparison circuit includes an amplifier and a comparator, and this comparator produces hysteresis characteristic, gets rid of noise and disturbs, and guarantees to survey accuracy of action.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN98207525U CN2375030Y (en) | 1998-07-23 | 1998-07-23 | D. C. brushless fan driving circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN98207525U CN2375030Y (en) | 1998-07-23 | 1998-07-23 | D. C. brushless fan driving circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2375030Y true CN2375030Y (en) | 2000-04-19 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN98207525U Expired - Lifetime CN2375030Y (en) | 1998-07-23 | 1998-07-23 | D. C. brushless fan driving circuit |
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| Country | Link |
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| CN (1) | CN2375030Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1323485C (en) * | 2003-07-16 | 2007-06-27 | 松下电器产业株式会社 | Motor controller |
| CN100397775C (en) * | 2005-07-07 | 2008-06-25 | 协禧电机股份有限公司 | Drive circuit of low-noise brush-less DC. fan |
| CN101567656B (en) * | 2008-04-23 | 2011-05-11 | 远翔科技股份有限公司 | Switch type regulating circuit and double-coil motor device |
-
1998
- 1998-07-23 CN CN98207525U patent/CN2375030Y/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1323485C (en) * | 2003-07-16 | 2007-06-27 | 松下电器产业株式会社 | Motor controller |
| CN100397775C (en) * | 2005-07-07 | 2008-06-25 | 协禧电机股份有限公司 | Drive circuit of low-noise brush-less DC. fan |
| CN101567656B (en) * | 2008-04-23 | 2011-05-11 | 远翔科技股份有限公司 | Switch type regulating circuit and double-coil motor device |
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| C14 | Grant of patent or utility model | ||
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| C17 | Cessation of patent right | ||
| CX01 | Expiry of patent term |