CN102678600A - Alternating current fan control circuit - Google Patents
Alternating current fan control circuit Download PDFInfo
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- CN102678600A CN102678600A CN2012101891216A CN201210189121A CN102678600A CN 102678600 A CN102678600 A CN 102678600A CN 2012101891216 A CN2012101891216 A CN 2012101891216A CN 201210189121 A CN201210189121 A CN 201210189121A CN 102678600 A CN102678600 A CN 102678600A
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Abstract
The invention discloses an alternating current fan control circuit. The circuit comprises a rectification circuit, a filter circuit, an electromagnetic interference circuit, a direct current-direct current (DC-DC) switching circuit, a step-down circuit and a fan drive circuit, wherein the rectification circuit is used for converting an alternating current power supply of a power grid to a pulse direct-current power supply, the filter circuit is arranged on an output stage of the rectification circuit and used for filtering a harmonic voltage generated by the rectification circuit, the electromagnetic interference circuit is disposed on an input stage of the rectification circuit and used for preventing the alternating current fan control circuit from interfering with other circuits during operation, the DC-DC switching circuit is mounted on an output stage of the filter circuit and used for converting the pulse direct-current power supply output by the rectification circuit and the filter circuit to a first direct current power supply, the step-down circuit is used for performing a voltage stabilization to the first direct current power supply output by the DC-DC switching circuit and outputting a second direct current power supply, and the fan drive circuit is used for driving a fan to forwardly rotate or reversely rotate. The alternating current fan control circuit is stable and reliable during operating.
Description
Technical field
The present invention relates to electronic technology field, particularly a kind of AC blower fan control circuit.
Background technique
AC blower fan is mainly used in the heat radiation of electronic product.Be widely used in fields such as digital electric, household electrical appliances, machinery, manufacturing equipment.AC blower fan, correspondence are provided with the blower fan drive circuit, are used to drive the fan rotation of blower fan, so that electronic product is dispelled the heat.Because the drive circuit of AC blower fan is after first alternating voltage with electrical network converts VDC into, blower fan to be driven again.And in the existing technology; After general employing is the ac voltage rectifier with electrical network; Directly rotate with the control blower fan through the blower fan drive circuit; Its problem that often occurs is: the VDC that flow into the blower fan drive circuit is unstable, so that the output of the electric current of blower fan drive circuit is unbalanced, thereby causes the rotation of blower fan unstable.In addition; The general H bridge drive circuit of forming by independent four triodes that adopts of blower fan drive circuit of the prior art; Its working principle is: when two triode conductings at H bridge drive circuit diagonal angle, driving blower fan just changes or reverse, but owing to the control signal of H bridge drive circuit is directly to be loaded on the grid of each triode, so its problem that possibly cause is: when two equal conductings of triode of H bridge drive circuit the same side; Two triodes that electric current will directly pass through the same side constitute loops; So that electric current damages triode, makes H bridge drive circuit ineffective, and blower fan can not rotate.In sum, AC blower fan control circuit of the prior art, its power supply is supplied with unstable, the work of drive circuit is unreliable so that blower fan can not reliable and stable rotation.
Summary of the invention
Technical problem to be solved by this invention is, overcomes above deficiency, and a kind of AC blower fan control circuit of reliable and stable work is provided.
In order to solve the problems of the technologies described above, technological scheme of the present invention is: a kind of AC blower fan control circuit comprises
Rectification circuit is used for the ac power supply of electrical network is transformed to Voltage pulsating direct-current supply;
Eliminator is arranged on the output stage of said rectification circuit, is used for the harmonic voltage that the said rectification circuit of filtering produces;
The electromagnetic interference circuit is arranged on the input stage of said rectification circuit, produces interference with other circuit when being used to prevent said AC blower fan control circuit work;
The DC-DC switching circuit is arranged on the output stage of said eliminator, is used for the Voltage pulsating direct-current supply of said rectification, eliminator output is transformed to first DC electrical source;
Reduction voltage circuit is used for first DC electrical source is carried out voltage stabilizing, and output is lower than second DC electrical source of said first DC electrical source;
The blower fan drive circuit is used to drive the just commentaries on classics or the counter-rotating of blower fan;
Said blower fan drive circuit comprises H bridge drive circuit;
Said H bridge drive circuit comprises the drive coil of the 3rd triode, the 4th triode, the 5th triode, the 6th triode, blower fan; The drain electrode of the drain electrode of said the 3rd triode, the 4th triode is connected with first DC electrical source; Common intersection after the source electrode of the source electrode of said the 5th triode, the 6th triode connects is through the 38 resistance eutral grounding; Common intersection after the drain electrode of the source electrode of said the 3rd triode and the 5th triode is connected connects said drive coil with common intersection after the drain electrode of the source electrode of the 4th triode and the 6th triode is connected;
The conducting of said the 3rd triode is perhaps by being controlled by the 7th triode; The base stage of said the 7th triode connects said second DC electrical source through the 22 resistance; The collector electrode of said the 7th triode connects first DC electrical source through the 30 resistance and the 33 resistance; Said the 30 resistance is connected the grid of said the 3rd triode with the common intersection of the 33 resistance, the emitter of said the 7th triode is connected with the first forward control signal; The grid of said the 6th triode is connected with second reverse control signal through the 39 resistance;
The conducting of said the 4th triode is perhaps by being controlled by the 8th triode; The base stage of said the 8th triode connects said second DC electrical source through the 40 resistance; The collector electrode of said the 8th triode connects first DC electrical source through the 41 resistance and the 42 resistance, and said the 41 resistance is connected the grid of said the 4th triode with the common intersection of the 42 resistance; The emitter of said the 8th triode is connected with the second forward control signal; The grid of said the 5th triode is connected with first reverse control signal through the 20 resistance.
Further, the said first forward control signal, the second forward control signal, first reverse control signal, second reverse control signal are provided by said motor predrive chip; When said motor predrive chip is exported the first forward control signal and second reverse control signal; The 6th triode conducting; And said the 7th triode is controlled said the 3rd triode conducting, and when said the 3rd triode, when the 6th triode is connected, drive coil drives blower fan just to be changeed; When said motor predrive chip is exported the second forward control signal and first reverse control signal; The 5th triode conducting; And said the 8th triode is controlled said the 4th triode conducting, and when said the 4th triode, when the 5th triode is connected, drive coil drives the blower fan counter-rotating.
Further, the model of said motor predrive chip is APX9281 or LB11867, and the 3rd pin of said motor predrive chip connects said second DC electrical source; The 14th pin ground connection; Be connected with the 7th electric capacity between the 7th pin and the ground, be connected with the 4th electric capacity between the 11st pin and the ground, the 13rd pin output 5V voltage; Be connected with first electric capacity between the 13rd pin and the ground; And be connected with second electric capacity between the 13rd pin and the 12nd pin, the 13rd pin is connected with the 5th pin, also is connected with second resistance and first resistance between the 13rd pin and the ground in turn; And the common intersection of said second resistance and first resistance is connected with the 6th pin of said motor predrive chip; The 9th pin and the 10th pin of said motor predrive chip are provided by Hall element, and the 16th pin of said motor predrive chip and the 1st pin are exported the first forward control signal and the second forward control signal respectively, and the 15th pin of said motor predrive chip and the 2nd pin are exported first reverse control signal and second reverse control signal respectively.
Further, two of said Hall element input pins are connected with the 10th pin with the 9th pin of said motor predrive chip respectively; One of them output pin ground connection of said Hall element, the another one output pin of said Hall element connects second DC electrical source through the 3rd resistance.
Further; Said DC-DC switching circuit; Comprise high-voltage switch gear type voltage stabilizing chip and switching tube; The high presser feet of said high-voltage switch gear type voltage stabilizing chip and the drain electrode end of said switching tube are provided by the Voltage pulsating direct-current supply of said rectification, eliminator output; The driving pin of said high-voltage switch gear type voltage stabilizing chip is through the gate terminal of the tenth resistance connection switching tube, and the source terminal of said switching tube is exported first DC electrical source through the 9th resistance, second inductance of series connection successively, and the common intersection of said the 9th resistance and second inductance is connected with the lower margin of said high-voltage switch gear type voltage stabilizing chip; The output terminal of said second inductance is the output terminal of said DC-DC switching circuit, and walking abreast between the output terminal of said DC-DC switching circuit and the ground is connected with the 11 electric capacity and fictitious load; Be connected with the 8th electric capacity between the supply pin of said high-voltage switch gear type voltage stabilizing chip and the lower margin; Be connected with feeder loop between the feedback pin of the output terminal of said DC-DC switching circuit and said high-voltage switch gear type voltage stabilizing chip; Be connected with the 88 resistance between the detection pin of said high-voltage switch gear type voltage stabilizing chip and the source electrode of said switching tube; Also oppositely be connected with second diode and the 3rd diode between the lower margin of said high-voltage switch gear type voltage stabilizing chip and the ground; Also be connected with the 5th resistance between the supply pin of said high-voltage switch gear type voltage stabilizing chip and the lower margin, middle end.
Further, the model of said high-voltage switch gear type voltage stabilizing chip is SMD911.
Further, said fictitious load is the 25 resistance and the 24 resistance of connecting successively that is connected between the output terminal of said DC-DC switching circuit and the ground.
Further; Said feeder loop; Comprise between the lower margin of the output terminal that is connected on said DC-DC switching circuit successively and said high-voltage switch gear type voltage stabilizing chip the 8th diode, the 16 resistance and the 7th resistance, the common intersection of said the 16 resistance and the 7th resistance is connected with the feedback pin of said high-voltage switch gear type voltage stabilizing chip.
Further; Said reduction voltage circuit; Comprise three terminal integrated voltage stabilizer; The lower margin ground connection of said three terminal integrated voltage stabilizer; The input pin of said three terminal integrated voltage stabilizer be connected with the output terminal of said DC-DC switching circuit and the input pin of said three terminal integrated voltage stabilizer and ground between be connected with the 17 electric capacity, the output pin of said three terminal integrated voltage stabilizer is to be connected with the 18 electric capacity between the output terminal of said reduction voltage circuit, output pin that its output has second DC electrical source and said three terminal integrated voltage stabilizer and the ground.
Further; Said reduction voltage circuit; Comprise second triode; The collector electrode of said second triode connects said first DC electrical source, and output terminal, its output of the very said reduction voltage circuit of the emission of said second triode have second DC electrical source, are connected with the tenth electric capacity between the output terminal of said reduction voltage circuit and the ground; Be connected with the 18 resistance between the base stage of said second triode and the collector electrode, the base stage of said second triode is through the 9th diode reverse ground connection.
AC blower fan control circuit of the present invention comprises rectification circuit, eliminator, DC-DC switching circuit, reduction voltage circuit, blower fan drive circuit.Wherein, the blower fan drive circuit adopts H bridge drive circuit, and H bridge drive circuit is made up of the drive coil of the 3rd triode, the 4th triode, the 5th triode, the 6th triode and blower fan; When said the 3rd triode, when the 6th triode is connected, drive coil drives blower fan just to be changeed; When said the 4th triode, when the 5th triode is connected, drive coil drives the blower fan counter-rotating.
The 3rd triode of said H bridge drive circuit and the conducting of the 6th triode are perhaps by being controlled by the 7th triode and second reverse control signal respectively; And the conducting of said the 7th triode is perhaps by being controlled by the first forward control signal; When motor predrive chip is exported the first forward control signal and second reverse control signal; Triode and the 6th triode conducting, then drive coil drives blower fan just changes;
The 4th triode of said H bridge drive circuit and the conducting of the 5th triode are perhaps by being controlled by the 8th triode and first reverse control signal respectively; And the conducting of said the 8th triode is perhaps by being controlled by the second forward control signal; When motor predrive chip is exported the second forward control signal and first reverse control signal; The 4th triode and the 5th triode conducting, then drive coil drives the blower fan counter-rotating.
The purpose that increases the 7th triode and the 8th triode is; The triode that prevents the same side in the H bridge drive circuit occurs constituting the conducting loop with drive coil after the conducting simultaneously; Thereby avoided drive coil to be produced, thereby protected drive coil not to be damaged by the situation of scaling loss.Promptly prevent the 3rd triode and the 5th triode and the 4th triode and conducting simultaneously of the 6th triode and drive coil formation conducting loop in the H bridge drive circuit.Therefore, the working stability of H bridge drive circuit of the present invention can make the drive coil drive blower fan of blower fan rotate reliably.
Description of drawings
Fig. 1 is the circuit theory diagrams of the embodiment of the invention;
Fig. 2 is the circuit theory diagrams of the reduction voltage circuit of the embodiment of the invention;
Fig. 3 is the circuit theory diagrams of another reduction voltage circuit of the embodiment of the invention.
Embodiment
Below in conjunction with accompanying drawing the present invention is described in detail:
Please refer to Fig. 1 to 3, the AC blower fan control circuit of the embodiment of the invention comprises rectification circuit, eliminator, electromagnetic interference circuit, DC-DC switching circuit, reduction voltage circuit, blower fan drive circuit.
Please refer to Fig. 1, said rectification circuit, the AC voltage conversion that is used for electrical network is a VDC; Rectification circuit in the present embodiment is the rectifier bridge D1 that four diodes constitute, and also can be rectification bridge block.
Please refer to Fig. 1, said eliminator is arranged on the output stage of said rectification circuit, is used for the harmonic voltage that the said rectification circuit of filtering produces; Eliminator in the present embodiment is a LC type eliminator, comprises and connect the 3rd capacitor C 3 of said rectification circuit output stage, and first inductance L 1 that is serially connected in said rectification circuit output plus terminal.
Please refer to Fig. 1, said electromagnetic interference circuit is arranged on the input stage of said rectification circuit, produces interference with other circuit when being used to prevent said AC blower fan control circuit work; Electromagnetic interference circuit in the present embodiment is the zero capacitance C0 that is arranged on the input stage of said rectification circuit.
Please refer to Fig. 1, said DC-DC switching circuit is arranged on the output stage of said eliminator, is used for the Voltage pulsating direct-current supply of said rectification, eliminator output is transformed to the first DC electrical source VCC1.Its circuit structure; Comprise high-voltage switch gear type voltage stabilizing chip U1 and switching tube Q1; The high presser feet (the 8th pin) of said high-voltage switch gear type voltage stabilizing chip U1 and the drain electrode end of said switching tube Q1 are provided by the Voltage pulsating direct-current supply of said rectification, eliminator output; The driving pin (the 5th pin) of said high-voltage switch gear type voltage stabilizing chip U1 connects the gate terminal of switching tube Q1 through the tenth resistance R 10; The source terminal of said switching tube Q1 is through the 9th resistance R 9, second inductance L, 2 outputs, the first DC electrical source VCC1 of series connection successively; The common intersection of said the 9th resistance R 9 and second inductance L 2 is connected with the lower margin (the 4th pin) of said high-voltage switch gear type voltage stabilizing chip U1, and the output terminal of said second inductance L 2 is the output terminal of said DC-DC switching circuit, and walking abreast between the output terminal of said DC-DC switching circuit and the ground is connected with the 11 capacitor C 11 and fictitious load; Said fictitious load is the 25 resistance R 25 and the 24 resistance R 24 of connecting successively that is connected between the output terminal of said DC-DC switching circuit and the ground; Be connected with the 8th capacitor C 8 between the supply pin (the 6th pin) of said high-voltage switch gear type voltage stabilizing chip U1 and the lower margin (the 4th pin); Be connected with feeder loop between the feedback pin (the 2nd pin) of the output terminal of said DC-DC switching circuit and said high-voltage switch gear type voltage stabilizing chip U1; Said feeder loop; Comprise between the lower margin (the 4th pin) of the output terminal that is connected on said DC-DC switching circuit successively and said high-voltage switch gear type voltage stabilizing chip the 8th diode D8, the 16 resistance R 16 and the 7th resistance R 7, the common intersection of said the 16 resistance R 16 and the 7th resistance R 7 is connected with the feedback pin (the 2nd pin) of said high-voltage switch gear type voltage stabilizing chip; Be connected with the 88 resistance R 88 between the detection pin (the 1st pin) of said high-voltage switch gear type voltage stabilizing chip U1 and the source electrode of said switching tube Q1; Also oppositely be connected with the second diode D2 and the 3rd diode D3 between the lower margin (the 4th pin) of said high-voltage switch gear type voltage stabilizing chip U1 and the ground; Also be connected with the 5th resistance R 5 between the supply pin (the 6th pin) of said high-voltage switch gear type voltage stabilizing chip U1 and the lower margin (the 4th pin); Preferably, forward is connected with the 7th diode D7 between the supply pin (the 6th pin) of the middle end of said second inductance and said high-voltage switch gear type voltage stabilizing chip.The model of said high-voltage switch gear type voltage stabilizing chip U1 is preferably SMD911.
Reduction voltage circuit in the present embodiment adopts two kinds of schemes:
Please refer to Fig. 2; The reduction voltage circuit of first kind of scheme; Comprise the second triode Q2; The collector electrode of the said second triode Q2 connects the said first DC electrical source VCC1, and the output terminal of the very said reduction voltage circuit of the emission of the said second triode Q2, its output have the second DC electrical source VCC2, is connected with the tenth capacitor C 10 between the output terminal of said reduction voltage circuit and the ground; Be connected with the 18 resistance R 18 between the base stage of the said second triode Q2 and the collector electrode, the base stage of the said second triode Q2 is through the reverse ground connection of the 9th diode D9, and said the 9th diode D9 is a voltage-stabiliser tube.
Please refer to Fig. 3; The reduction voltage circuit of second kind of scheme; Comprise three terminal integrated voltage stabilizer U4; The lower margin ground connection of said three terminal integrated voltage stabilizer U4; The input pin of said three terminal integrated voltage stabilizer U4 is connected with the output terminal of said DC-DC switching circuit between input pin and the ground of (promptly connecting the first DC electrical source VCC1) and said three terminal integrated voltage stabilizer U4 and is connected with the 17 capacitor C 17, and the output pin of said three terminal integrated voltage stabilizer U4 is that output terminal, its output of said reduction voltage circuit has between output pin and the ground of the second DC electrical source VCC2 and said three terminal integrated voltage stabilizer U4 and is connected with the 18 capacitor C 18.Wherein, said the 17 capacitor C 17 and the 18 capacitor C 18 are electrochemical capacitor.The model of three terminal integrated voltage stabilizer U4 in the present embodiment can be 78XX system, LM317, FS117 etc.
Please refer to Fig. 1, said blower fan drive circuit is used to drive the just commentaries on classics or the counter-rotating of blower fan; Its circuit connection structure comprises H bridge drive circuit; Said H bridge drive circuit comprises the drive coil L3 of the 3rd triode Q3, the 4th triode Q4, the 5th triode Q5, the 6th triode Q6, blower fan; The drain electrode of the drain electrode of said the 3rd triode Q3, the 4th triode Q4 connects the said first DC electrical source VCC1; Common intersection after the source electrode of the source electrode of said the 5th triode Q5, the 6th triode Q6 connects is through the 38 resistance R 38 ground connection; Common intersection after the drain electrode of the source electrode of said the 3rd triode Q3 and the 5th triode Q5 is connected connects said drive coil L3 with common intersection after the drain electrode of the source electrode of the 4th triode Q4 and the 6th triode Q6 is connected;
The conducting of said the 3rd triode Q3 is perhaps by being controlled by the 7th triode Q7; The base stage of said the 7th triode Q7 connects the said second DC electrical source VCC2 through the 22 resistance R 22; The collector electrode of said the 7th triode Q7 meets the first DC electrical source VCC1 through the 30 resistance R 30 and the 33 resistance R 33; Said the 30 resistance R 30 is connected the grid of said the 3rd triode Q3 with the common intersection of the 33 resistance R 33, the emitter of said the 7th triode Q7 is connected with the first forward control signal P1; The grid of said the 6th triode Q6 is connected with the second reverse control signal N2 through the 39 resistance R 39;
The conducting of said the 4th triode Q4 is perhaps by being controlled by the 8th triode Q8; The base stage of said the 8th triode Q8 connects the said second DC electrical source VCC2 through the 40 resistance R 40; The collector electrode of said the 8th triode Q8 meets the first DC electrical source VCC1 through the 41 resistance R 41 and the 42 resistance R 42, and said the 41 resistance R 41 is connected the grid of said the 4th triode Q4 with the common intersection of the 42 resistance R 42; The emitter of said the 8th triode Q8 is connected with the second forward control signal P2; The grid of said the 5th triode Q5 is connected with the first reverse control signal N1 through the 20 resistance R 20.
As preferred implementation, forward is connected with the 5th diode D5 between the grid of said the 3rd triode Q3 and the drain electrode, and said the 5th diode D5 is a voltage-stabiliser tube; The grid of said the 4th triode Q4 and the drain electrode between also forward be connected with the 6th diode D6, said the 6th diode D6 also is a voltage-stabiliser tube.
The said first forward control signal P1, the second forward control signal P2, the first reverse control signal N1, the second reverse control signal N2 are provided by said motor predrive chip U2; When said motor predrive chip U2 exports the first forward control signal P1 and the second reverse control signal N2; The 6th triode Q6 conducting; And said the 7th triode Q7 controls said the 3rd triode Q3 conducting; As said the 3rd triode Q3, when the 6th triode Q6 connects, drive coil L3 drives blower fan just to be changeed; When said motor predrive chip U2 exports the second forward control signal P2 and the first reverse control signal N2; The 5th triode Q5 conducting; And said the 8th triode Q8 controls said the 4th triode Q4 conducting; As said the 4th triode Q4, when the 5th triode Q5 connects, drive coil L3 drives the blower fan counter-rotating.
The preferred model of said motor predrive chip U2 is APX9281.The 3rd pin of said motor predrive chip U2 connects the said second DC electrical source VCC2; The 14th pin ground connection is connected with between the 7th pin and the ground between the 7th capacitor C 7, the 11 pin and the ground and is connected with the 4th capacitor C 4; The 13rd pin output 5V voltage; Be connected with first capacitor C 1 between the 13rd pin and the ground, and be connected with second capacitor C, 2, the 13 pin between the 13rd pin and the 12nd pin and be connected with the 5th pin; Also be connected with second resistance R 2 and first resistance R 1 between the 13rd pin and the ground in turn; And the common intersection of said second resistance R 2 and first resistance R 1 is connected with the 6th pin of said motor predrive chip U2, and the 9th pin and the 10th pin of said motor predrive chip U2 are provided by Hall element, and two input pins of said Hall element are connected with the 10th pin with the 9th pin of said motor predrive chip U2 respectively; One of them output pin ground connection of said Hall element, the another one output pin of said Hall element connects the second DC electrical source VCC2 through the 3rd resistance R 3; The 16th pin of said motor predrive chip U2 and the 1st pin are exported the first forward control signal P1 and the second forward control signal P2 respectively, and the 15th pin of said motor predrive chip U2 and the 2nd pin are exported the first reverse control signal N1 and the second reverse control signal N2 respectively.
In above-mentioned, motor driven chip U12 also can use the motor driven chip of model as LB11867.
In the present embodiment, be provided with safety fuse cutout F2, to play a protective role when the overcurrent overheat in the input stage of rectification circuit.
The preferred voltage value of the first DC electrical source VCC1 in above-mentioned is 48 volts; The preferred voltage value of the second DC electrical source VCC2 is 12 volts.
AC blower fan control circuit of the present invention comprises rectification circuit, eliminator, DC-DC switching circuit, reduction voltage circuit, blower fan drive circuit.Wherein, the blower fan drive circuit adopts H bridge drive circuit, and H bridge drive circuit is made up of the drive coil L3 of the 3rd triode Q3, the 4th triode Q4, the 5th triode Q5, the 6th triode Q6 and blower fan; As said the 3rd triode Q3, when the 6th triode Q6 connects, drive coil L3 drives blower fan just to be changeed; As said the 4th triode Q4, when the 5th triode Q5 connects, drive coil L3 drives the blower fan counter-rotating.
The 3rd triode Q3 of said H bridge drive circuit and the conducting of the 6th triode Q6 are perhaps by being controlled by the 7th triode Q7 and the second reverse control signal N2 respectively; And the conducting of said the 7th triode Q7 is perhaps by being controlled by the first forward control signal P1; When motor predrive chip U2 exports the first forward control signal P1 and the second reverse control signal N2; Triode and the 6th triode Q6 conducting, then drive coil L3 drives blower fan just changes;
The 4th triode Q4 of said H bridge drive circuit and the conducting of the 5th triode Q5 are perhaps by being controlled by the 8th triode Q8 and the first reverse control signal N1 respectively; And the conducting of said the 8th triode Q8 is perhaps by being controlled by the second forward control signal P2; When motor predrive chip U2 exports the second forward control signal P2 and the first reverse control signal N1; The 4th triode and the 5th triode Q5 conducting, then drive coil L3 drives the blower fan counter-rotating.
The purpose that increases the 7th triode Q7 and the 8th triode Q8 is; The triode that prevents the same side in the H bridge drive circuit occurs constituting the conducting loop with drive coil L3 after the conducting simultaneously; Thereby avoided drive coil L3 to be produced, thereby protected drive coil L3 not to be damaged by the situation of scaling loss.Promptly prevent the 3rd triode Q3 and the 5th triode Q5 and the 4th triode Q4 and the 6th triode Q6 conducting simultaneously and drive coil L3 formation conducting loop in the H bridge drive circuit.
In addition; Because the first forward control signal P1 of motor predrive chip U2 and the second reverse control signal N2 are one group of output signal; The second forward control signal P2 and the first reverse control signal N2 are another group output signals; Thereby the H bridge drive circuit that guarantees has only the conducting of one group of diagonal angle triode, thereby has guaranteed that drive coil can drive blower fan and just change or reverse.Therefore, the working stability of H bridge drive circuit of the present invention can make the drive coil L3 drive blower fan of blower fan rotate reliably.
Claims (10)
1. an AC blower fan control circuit is characterized in that, comprises
Rectification circuit is used for the ac power supply of electrical network is transformed to Voltage pulsating direct-current supply;
Eliminator is arranged on the output stage of said rectification circuit, is used for the harmonic voltage that the said rectification circuit of filtering produces;
The electromagnetic interference circuit is arranged on the input stage of said rectification circuit, produces interference with other circuit when being used to prevent said AC blower fan control circuit work;
The DC-DC switching circuit is arranged on the output stage of said eliminator, is used for the Voltage pulsating direct-current supply of said rectification, eliminator output is transformed to first DC electrical source;
Reduction voltage circuit is used for first DC electrical source is carried out voltage stabilizing, and output is lower than second DC electrical source of said first DC electrical source;
The blower fan drive circuit is used to drive the just commentaries on classics or the counter-rotating of blower fan;
Said blower fan drive circuit comprises H bridge drive circuit;
Said H bridge drive circuit comprises the drive coil of the 3rd triode, the 4th triode, the 5th triode, the 6th triode, blower fan; The drain electrode of the drain electrode of said the 3rd triode, the 4th triode connects said first DC electrical source; Common intersection after the source electrode of the source electrode of said the 5th triode, the 6th triode connects is through the 38 resistance eutral grounding; Common intersection after the drain electrode of the source electrode of said the 3rd triode and the 5th triode is connected connects said drive coil with common intersection after the drain electrode of the source electrode of the 4th triode and the 6th triode is connected;
The conducting of said the 3rd triode is perhaps by being controlled by the 7th triode; The base stage of said the 7th triode connects said second DC electrical source through the 22 resistance; The collector electrode of said the 7th triode connects first DC electrical source through the 30 resistance and the 33 resistance; Said the 30 resistance is connected the grid of said the 3rd triode with the common intersection of the 33 resistance, the emitter of said the 7th triode is connected with the first forward control signal; The grid of said the 6th triode is connected with second reverse control signal through the 39 resistance;
The conducting of said the 4th triode is perhaps by being controlled by the 8th triode; The base stage of said the 8th triode connects said second DC electrical source through the 40 resistance; The collector electrode of said the 8th triode connects first DC electrical source through the 41 resistance and the 42 resistance, and said the 41 resistance is connected the grid of said the 4th triode with the common intersection of the 42 resistance; The emitter of said the 8th triode is connected with the second forward control signal; The grid of said the 5th triode is connected with second reverse control signal through the grid that the 20 resistance is connected with said the 6th triode of first reverse control signal through the 39 resistance.
2. AC blower fan control circuit as claimed in claim 1 is characterized in that, the said first forward control signal, the second forward control signal, first reverse control signal, second reverse control signal provide by motor predrive chip; When said motor predrive chip is exported the first forward control signal and second reverse control signal; The 6th triode conducting; And said the 7th triode is controlled said the 3rd triode conducting, and when said the 3rd triode, when the 6th triode is connected, drive coil drives blower fan just to be changeed; When said motor predrive chip is exported the second forward control signal and first reverse control signal; The 5th triode conducting; And said the 8th triode is controlled said the 4th triode conducting, and when said the 4th triode, when the 5th triode is connected, drive coil drives the blower fan counter-rotating.
3. AC blower fan control circuit as claimed in claim 2; It is characterized in that the model of said motor predrive chip is APX9281 or LB11867, the 3rd pin of said motor predrive chip connects said second DC electrical source; The 14th pin ground connection; Be connected with the 7th electric capacity between the 7th pin and the ground, be connected with the 4th electric capacity between the 11st pin and the ground, the 13rd pin output 5V voltage; Be connected with first electric capacity between the 13rd pin and the ground; And be connected with second electric capacity between the 13rd pin and the 12nd pin, the 13rd pin is connected with the 5th pin, also is connected with second resistance and first resistance between the 13rd pin and the ground in turn; And the common intersection of said second resistance and first resistance is connected with the 6th pin of said motor predrive chip; The 9th pin and the 10th pin of said motor predrive chip are provided by Hall element, and the 16th pin of said motor predrive chip and the 1st pin are exported the first forward control signal and the second forward control signal respectively, and the 15th pin of said motor predrive chip and the 2nd pin are exported first reverse control signal and second reverse control signal respectively.
4. AC blower fan control circuit as claimed in claim 3 is characterized in that, two input pins of said Hall element are connected with the 10th pin with the 9th pin of said motor predrive chip respectively; One of them output pin ground connection of said Hall element, the another one output pin of said Hall element connects second DC electrical source through the 3rd resistance.
5. AC blower fan control circuit as claimed in claim 1; It is characterized in that; Said DC-DC switching circuit; Comprise high-voltage switch gear type voltage stabilizing chip and switching tube, the high presser feet of said high-voltage switch gear type voltage stabilizing chip and the drain electrode end of said switching tube are provided by the Voltage pulsating direct-current supply of said rectification, eliminator output, and the driving pin of said high-voltage switch gear type voltage stabilizing chip connects the gate terminal of switching tube through the tenth resistance; The source terminal of said switching tube is exported first DC electrical source through the 9th resistance, second inductance of series connection successively; The common intersection of said the 9th resistance and second inductance is connected with the lower margin of said high-voltage switch gear type voltage stabilizing chip, and the output terminal of said second inductance is the output terminal of said DC-DC switching circuit, and walking abreast between the output terminal of said DC-DC switching circuit and the ground is connected with the 11 electric capacity and fictitious load; Be connected with the 8th electric capacity between the supply pin of said high-voltage switch gear type voltage stabilizing chip and the lower margin; Be connected with feeder loop between the feedback pin of the output terminal of said DC-DC switching circuit and said high-voltage switch gear type voltage stabilizing chip; Be connected with the 88 resistance between the detection pin of said high-voltage switch gear type voltage stabilizing chip and the source electrode of said switching tube; Also oppositely be connected with second diode and the 3rd diode between the lower margin of said high-voltage switch gear type voltage stabilizing chip and the ground, also be connected with the 5th resistance between the supply pin of said high-voltage switch gear type voltage stabilizing chip and the lower margin.
6. AC blower fan control circuit as claimed in claim 5 is characterized in that, the model of said high-voltage switch gear type voltage stabilizing chip is SMD911.
7. AC blower fan control circuit as claimed in claim 5 is characterized in that, said fictitious load is the 25 resistance and the 24 resistance of connecting successively that is connected between the output terminal of said DC-DC switching circuit and the ground.
8. AC blower fan control circuit as claimed in claim 5; It is characterized in that; Said feeder loop; Comprise between the lower margin of the output terminal that is connected on said DC-DC switching circuit successively and said high-voltage switch gear type voltage stabilizing chip the 8th diode, the 16 resistance and the 7th resistance, the common intersection of said the 16 resistance and the 7th resistance is connected with the feedback pin of said high-voltage switch gear type voltage stabilizing chip.
9. AC blower fan control circuit as claimed in claim 1; It is characterized in that; Said reduction voltage circuit; Comprise three terminal integrated voltage stabilizer; The lower margin ground connection of said three terminal integrated voltage stabilizer, the input pin of said three terminal integrated voltage stabilizer be connected with the output terminal of said DC-DC switching circuit and the input pin of said three terminal integrated voltage stabilizer and ground between be connected with the 17 electric capacity, the output pin of said three terminal integrated voltage stabilizer is that the output terminal of said reduction voltage circuit, its output have between output pin and the ground of second DC electrical source and said three terminal integrated voltage stabilizer and is connected with the 18 electric capacity.
10. AC blower fan control circuit as claimed in claim 1; It is characterized in that; Said reduction voltage circuit comprises second triode, and the collector electrode of said second triode connects said first DC electrical source; Output terminal, its output of the very said reduction voltage circuit of the emission of said second triode have second DC electrical source, are connected with the tenth electric capacity between the output terminal of said reduction voltage circuit and the ground; Be connected with the 18 resistance between the base stage of said second triode and the collector electrode, the base stage of said second triode is through the 9th diode reverse ground connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012101891216A CN102678600A (en) | 2012-06-08 | 2012-06-08 | Alternating current fan control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012101891216A CN102678600A (en) | 2012-06-08 | 2012-06-08 | Alternating current fan control circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102678600A true CN102678600A (en) | 2012-09-19 |
Family
ID=46810999
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012101891216A Pending CN102678600A (en) | 2012-06-08 | 2012-06-08 | Alternating current fan control circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102678600A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103607163A (en) * | 2013-12-11 | 2014-02-26 | 深圳市联翔电机有限公司 | Cooling fan |
| CN109026808A (en) * | 2018-08-16 | 2018-12-18 | 付燕萍 | Automobile cooling control system and control method |
| CN109209964A (en) * | 2018-08-16 | 2019-01-15 | 付燕萍 | intelligent ventilation control system and control method |
-
2012
- 2012-06-08 CN CN2012101891216A patent/CN102678600A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103607163A (en) * | 2013-12-11 | 2014-02-26 | 深圳市联翔电机有限公司 | Cooling fan |
| CN103607163B (en) * | 2013-12-11 | 2017-07-11 | 深圳市联翔电机有限公司 | Radiator fan |
| CN109026808A (en) * | 2018-08-16 | 2018-12-18 | 付燕萍 | Automobile cooling control system and control method |
| CN109209964A (en) * | 2018-08-16 | 2019-01-15 | 付燕萍 | intelligent ventilation control system and control method |
| CN109026808B (en) * | 2018-08-16 | 2019-12-10 | 江苏斯瑞达材料技术股份有限公司 | automobile cooling control system and control method |
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Application publication date: 20120919 |