CN201319578Y - Control circuit of brushless fan directly connected with AC commercial power source - Google Patents

Control circuit of brushless fan directly connected with AC commercial power source Download PDF

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CN201319578Y
CN201319578Y CNU2008202141146U CN200820214114U CN201319578Y CN 201319578 Y CN201319578 Y CN 201319578Y CN U2008202141146 U CNU2008202141146 U CN U2008202141146U CN 200820214114 U CN200820214114 U CN 200820214114U CN 201319578 Y CN201319578 Y CN 201319578Y
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resistance
diode
module
triode
nmos pipe
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黄瑞益
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Abstract

The utility model discloses a control circuit of a brushless fan directly connected with an AC commercial power source, which comprises a voltage conversion module, a boost module, a voltage stabilizing module, a control module, a motor driving module and a Hall device, wherein the voltage conversion module rectifies alternating current commercial power into a direct current power source and outputs the rectified direct current power source to the voltage stabilizing module, the boost module and the motor driving module; the voltage stabilizing module stabilizes the direct current power source and outputs the stabilized direct current power source to the Hall device and the control module; the boost module boosts the current power source and outputs the boosted current power source to the motor driving module; the Hall device detects a phase signal of a motor rotor of the brushless fan; the control module processes the phase signal to obtain a switch signal and outputs the switch signal to the motor driving module and the boost module; the motor driving module comprises an H bridge type drive circuit consisting of four NMOS tubes and drive coils; one end of each of the drive coils is coupled between the ninth NMOS tube and the tenth NMOS, and the other end is coupled between the eleventh NMOS tube and the twelfth NMOS tube. The control circuit has low cost.

Description

A kind of control circuit that directly connects the brush-less fan of AC mains supply
Technical field
The utility model relates to a kind of control circuit that directly connects the brush-less fan of AC mains supply.
Background technology
The power supply that existing direct current (DC) does not have a fan that looses generally all adopts power supply adaptor that interchange (AC) civil power of 110 volts or 220 volts is converted to 48V or lower DC power supply, and then uses for the DC brush-less fan.The AC independent current source that changes DC parts that are absolutely necessary like this, when fan power was big, its cost can also increase substantially.
The motor driving module of the control circuit of existing brush-less fan is the H bridge drive circuit that adopts, and mainly is made up of 2 P type metal-oxide-semiconductors and 2 N type metal-oxide-semiconductors of complementation, and its efficient is higher.But because the restriction of the manufacturing process of metal-oxide-semiconductor, the withstand voltage and power of P type metal-oxide-semiconductor all is difficult to improve, and its manufacturing process complexity, and cost is high, so be difficult to find suitable P type metal-oxide-semiconductor in the high voltage occasion.
Summary of the invention
The utility model is exactly in order to overcome above deficiency, to have proposed a kind of control circuit that directly connects the brush-less fan of AC mains supply, reducing cost.
Technical problem of the present utility model is solved by following technical scheme:
A kind of control circuit that directly connects the brush-less fan of AC mains supply comprises voltage transformation module, boost module, Voltage stabilizing module, control module, motor driving module, hall device; Described voltage transformation module is rectified into electric main DC power supply and exports Voltage stabilizing module, boost module and motor driving module to, described Voltage stabilizing module carries out described DC power supply voltage stabilizing and exports hall device to and control module, and described boost module boosts DC power supply and exports motor driving module to; The phase signal of the motor rotor of described hall device detection brush-less fan also exports control module to, and described control module is handled described phase signal and obtained switching signal and export motor driving module to and boost module; Described motor driving module comprises the H bridge drive circuit of being made up of the 9th NMOS pipe, the tenth NMOS pipe, the 11 NMOS pipe, the 12 NMOS pipe and drive coil, and described drive coil one end is coupling between the 9th NMOS pipe and the tenth NMOS pipe, the other end is coupling between the 11 NMOS pipe and the 12 NMOS pipe.
Preferably:
Described boost module comprises the 9th resistance, the 15 electric capacity, first triode, the 4th resistance, the 3rd resistance, second electric capacity, the 7th diode, the 6th diode, first electric capacity; The described first triode emitter grounding, base stage are passed through the 15 electric capacity and the 9th resistance and control module coupling, collector electrode and are coupled with the 3rd resistance first end, second electric capacity, first end respectively; Described second electric capacity, second end is coupled with the 6th diode cathode, the 7th diode anode respectively, described the 6th diode anode is coupled with first electric capacity, first end, the 3rd resistance respectively, described the 7th diode cathode and the coupling of first electric capacity, second end, described the 4th resistance is connected across between the base stage and collector electrode of first triode.
Described boost module also comprises first voltage-stabiliser tube and the 17 diode; Described first voltage-stabiliser tube is connected across the first electric capacity two ends, and described the 17 diode anode ground connection, negative electrode link to each other with first transistor base.
Described motor driving module also comprises the first protection branch road and the second protection branch road; The described first protection branch road is coupling between the grid of the grid of the 9th NMOS pipe and the tenth NMOS pipe, is used to make the 9th NMOS pipe and the tenth NMOS to manage not open-minded simultaneously; The described second protection branch road is coupling between the grid of the grid of the 11 NMOS pipe and the 12 NMOS pipe, is used to make the 11 NMOS pipe and the 12 NMOS to manage not open-minded simultaneously.
The described first protection branch road comprises the 28 resistance, the 21 diode, the 31 resistance, the 24 resistance, the 4th triode, the 30 resistance, the 5th triode, the 29 resistance; Described the 28 resistance, the 21 diode, the 31 resistance are coupling between described the 9th NMOS tube grid and the 4th transistor base after linking to each other, described the 4th transistor base is also by the 24 resistance and control module coupling, described the 4th transistor collector is coupled by the 30 resistance and the 5th transistor base, described the 4th triode ground connection; Described the 5th transistor collector and Voltage stabilizing module output are coupled, and described the 5th triode emitter-base bandgap grading is coupled to the grid of the tenth NMOS pipe, and described the 29 resistance is coupling between the collector electrode and base stage of the 5th triode; The described second protection branch road comprises the 35 resistance, the 22 diode, the 38 resistance, the 25 resistance, the 7th triode, the 37 resistance, the 8th triode, the 36 resistance; Described the 35 resistance, the 22 diode, the 38 resistance are coupling between described the 11 NMOS tube grid and the 7th transistor base after linking to each other, described the 7th transistor base is also by the 25 resistance and control module coupling, described the 7th transistor collector is coupled by the 37 resistance and the 8th transistor base, described the 7th triode ground connection; Described the 8th transistor collector and Voltage stabilizing module output are coupled, and described the 8th triode emitter-base bandgap grading is coupled to the grid of the 12 NMOS pipe, and described the 36 resistance is coupling between the collector electrode and base stage of the 8th triode.
Described motor driving module also comprises the tenth diode and the 14 diode, and described the tenth diode anode links to each other with the 9th NMOS pipe source electrode, negative electrode links to each other with drive coil with the drain electrode of the tenth NMOS pipe respectively; Described the 14 diode anode links to each other with the 11 NMOS pipe source electrode, negative electrode links to each other with drive coil with the drain electrode of the 12 NMOS pipe respectively.
Described motor driving module also comprises the 9th diode, the 11 diode, the 13 diode and the 15 diode, described the 9th diode cathode is connected between the 28 resistance and the 9th NMOS tube grid, anode links to each other with the tenth diode cathode, described the 11 diode anode links to each other with the tenth diode cathode, negative electrode links to each other with the drain electrode of the 9th NMOS pipe, described the 15 diode cathode is connected between the 35 resistance and the 11 NMOS tube grid, anode links to each other with the tenth tetrode negative electrode, and described the 13 diode anode links to each other with the tenth tetrode negative electrode, negative electrode links to each other with the drain electrode of the 11 NMOS pipe.
Also comprise the PWM control module, be coupled to a port of control module after the output of described PWM control module and the output of the described hall device stack, described control module is distinguished the pwm signal of PWM control module output and the hall signal of hall device output, and gives motor driving module according to the control signal of pwm signal output duty cycle and frequency adjustable.
Described PWM control module comprises optocoupler, the 51 resistance, second resistance and the 8th diode, described optocoupler input is connected to direct current, described optocoupler first output is coupled through the 51 resistance and Voltage stabilizing module output, described optocoupler second output is through second grounding through resistance, and described the 8th diode anode is connected between optocoupler second output and second resistance, negative electrode and control module are coupled.
Described PWM control module also comprises the 4th voltage-stabiliser tube, the 50 resistance and the 13 electric capacity and the 53 resistance, described the 4th voltage-stabiliser tube is connected across the second resistance two ends, described the 50 resistance is connected between second resistance and the 8th diode anode, described the 13 electric capacity one end is connected between described the 50 resistance and the 8th diode anode, other end ground connection, and described the 53 resistance one end links to each other with the 8th diode cathode, other end ground connection.
The beneficial effect that the utility model is compared with the prior art is: the control circuit that directly connects the brush-less fan of AC mains supply of the present utility model can directly connect civil power and not need to connect in addition power supply, on 2 the P type MOS of 4 N type metal-oxide-semiconductors replacements of its motor driving module employing prior aries and the basis of 2 N type metal-oxide-semiconductors, for preventing that 4 N type metal-oxide-semiconductor voltage across poles are higher than rated voltage, utilizing boosts overcomes the requirement that power device grid and source electrode voltage across poles are not higher than rated voltage.All be difficult to the problem that improves with regard to having solved P type metal-oxide-semiconductor resistance to pressure and power like this, reduced production cost again.
Description of drawings
Fig. 1 is the structured flowchart of the utility model embodiment;
Fig. 2 is the particular circuit configurations schematic diagram of the utility model embodiment.
Embodiment
Also in conjunction with the accompanying drawings the utility model is described in further details below by concrete execution mode.
As shown in Figure 1, a kind of control circuit that directly connects the brush-less fan of AC mains supply comprises voltage transformation module 1, boost module 3, Voltage stabilizing module 4, control module 8, motor driving module 6, hall device 7.Described control module 8 can be single-chip microcomputer or micro-control unit (MCU).
Voltage transformation module 1 is rectified into DC power supply with electric main and exports Voltage stabilizing module 4, boost module 3 and motor driving module 6 to.Voltage stabilizing module 4 carries out DC power supply voltage stabilizing and exports hall device 7 to and control module 8.Voltage stabilizing module 4 has guaranteed the reliability and the stability of control module 8 work.Boost module 3 boosts DC power supply and exports motor driving module 6 to.
The phase signal of the motor rotor of hall device 7 detection brush-less fans also exports control module 8 to.8 pairs of phase signals of control module are handled and are obtained switching signal and export motor driving module 6 to and boost module 3.
Voltage transformation module 1 comprises rectifier bridge, thermistor NTC1 and the Transient Suppression Diode TVS1 that fuse F1, diode D1~D4 forms.Thermistor NTC1 and Transient Suppression Diode TVS 1 shield.
Motor driving module 6 comprises the H bridge drive circuit of being made up of the 9th NMOS pipe Q9, the tenth NMOS pipe Q10, the 11 NMOS pipe Q11, the 12 NMOS pipe Q12 and drive coil L1, and drive coil L1 one end is connected between the 9th NMOS pipe Q9 and the tenth NMOS pipe Q10, the other end is connected between the 11 NMOS pipe Q11 and the 12 NMOS pipe Q12.Boost module 3 is actual to be exactly DC power supply to be boosted and the 9th NMOS pipe Q9, the 11 NMOS that export motor driving module 6 to manages Q11.Described the 9th NMOS pipe Q9, the tenth NMOS pipe Q10, the 11 NMOS pipe Q11, the 12 NMOS pipe Q12 is a N type metal-oxide-semiconductor.Motor driving module 6 of the present utility model adopts 4 N type metal-oxide-semiconductors, and circuit is withstand voltage to be increased substantially, and makes fan power supply can directly connect civil power.
As shown in Figure 2, motor driving module 6 also comprises the first protection branch road and the second protection branch road; Grid and the tenth NMOS that the first protection branch road is coupling in the 9th NMOS pipe Q9 manage between the grid of Q10, are used to make the 9th NMOS pipe Q9 and the tenth NMOS pipe Q10 not open-minded simultaneously; Grid and the 12 NMOS that the second protection branch road is coupling in the 11 NMOS pipe Q11 manage between the grid of Q12, are used to make the 11 NMOS pipe Q11 and the 12 NMOS pipe Q12 not open-minded simultaneously.
As shown in Figure 2, the described first protection branch road comprises the 28 resistance R the 28, the 21 diode D21, the 31 resistance R the 31, the 24 resistance R 24, the 4th triode Q4, the 30 resistance R 30, the 5th triode Q5, the 29 resistance R 29; After linking to each other, the 28 resistance R the 28, the 21 diode D21, the 31 resistance R 31 be coupling between the 9th NMOS pipe Q9 grid and the 4th triode Q4 base stage, the 4th triode Q4 base stage is also by the 24 resistance R 24 and the coupling of control module 8 the 6th pin, the 4th triode Q4 collector electrode is coupled by the 30 resistance R 30 and the 5th triode Q5 base stage, the 4th triode Q4 ground connection; The 5th triode Q5 collector electrode and Voltage stabilizing module 4 outputs are coupled, and the 5th triode Q5 emitter-base bandgap grading is coupled to the grid of the tenth NMOS pipe Q10, and the 29 resistance R 29 is coupling between the collector electrode and base stage of the 5th triode Q5.
As shown in Figure 2, the described second protection branch road comprises the 35 resistance R the 35, the 22 diode D22, the 38 resistance R the 38, the 25 resistance R 25, the 7th triode Q7, the 37 resistance R 37, the 8th triode Q8, the 36 resistance R 36; After linking to each other, the 35 resistance R the 35, the 22 diode D22, the 38 resistance R 38 be coupling between the 11 NMOS pipe Q9 grid and the 7th triode Q7 base stage, the 7th triode Q7 base stage is also by the 25 resistance R 25 and the coupling of control module 8 the 5th pin, the 7th triode Q7 collector electrode is coupled by the 37 resistance R 37 and the 8th triode Q8 base stage, the 7th triode Q7 ground connection; The 8th triode Q8 collector electrode and Voltage stabilizing module 4 outputs are coupled, and the 8th triode Q8 emitter-base bandgap grading is coupled to the grid of the 12 NMOS pipe Q12, and the 36 resistance R 36 is coupling between the collector electrode and base stage of the 8th triode Q8.
Output high level H in 1 pin of control module 8 (U2), after the base stage by the 23 resistance R 23 to the 3rd triode Q3, the collector electrode output low level of the 3rd triode Q3 is by the grid of the 28 resistance R 28 to the 9th NMOS pipe Q9.Because of what arrive the 9th NMOS pipe Q9 grid is low level L, then not conducting of the 9th NMOS pipe Q9.
When 1 pin of U2 is exported high level H, then (1 pin of U2 and 2 pin are symmetry output from 2 pin, 2 pin output low levels when 1 pin output high level, 2 pin output high level when 1 pin output low level) output will be low level L in, base stage by the 26 resistance R 26 to the 6th triode Q6, the collector electrode of the 6th triode Q6 will be exported high level H, arrive the grid that the tenth NMOS manages Q10 through the 35 resistance R 35, and then the tenth NMOS pipe Q10 is with conducting.In like manner, if the 1 pin output low level L of U2,2 pin are then exported high level H, will be the 9th NMOS pipe Q9 conductings, not conducting of the tenth NMOS pipe Q10.
When the 9th NMOS pipe Q9 conducting, make electric current drive fan running through drive coil L1, the then necessary conducting of the 12 NMOS pipe Q12, not conducting of the tenth NMOS pipe Q10 promptly want 5 pin of U2 to be output as low level L, and 6 pin are output as high level H.Otherwise, when the 11 NMOS pipe Q11 conducting, the necessary conducting of the tenth NMOS pipe Q10, not conducting of the 12 NMOS pipe Q12, then 5 pin of U2 are output as high level H, and 6 pin are output as low level L.
When control module 8 unusual deadlocks, the external world or power supply during to many fortuitous events such as moment time-delay of the interference of motor driving module 6 and switching signal, all might cause the 9th NMOS pipe Q9/ the tenth NMOS pipe Q10 or the 11 NMOS pipe Q11/ the 12 NMOS pipe Q12 to open simultaneously, thereby cause motor driving module 6 short circuits to be burnt, can't operate as normal.The utility model is provided with the first protection branch road and the second protection branch road, can the normal operation of motor driving module 6 be played a protective role.
The operation principle of the first protection branch road is as follows: when the 9th NMOS pipe Q9 opens; show that then the 9th NMOS pipe Q9 grid is a high level; so the collector electrode of the 28 resistance R 28 and the 3rd triode Q3 mutually the level of contact be high level H; this high level voltage is after the base stage of the 21 diode D21, the 31 resistance R 31 to the 4th triode Q4; then the collector electrode of Q4 can close the 5th triode Q5 by output low level L, finally causes the tenth NMOS pipe Q10 to close.Promptly the 9th NMOS pipe Q9 and the tenth NMOS pipe Q10 can not open simultaneously.In like manner under the protection of the second protection branch road, the 11 NMOS pipe Q11 and the 12 NMOS pipe Q12 do not open simultaneously.
As shown in Figure 2, described motor driving module 6 also comprises the tenth diode D10 and the 14 diode D14, and described the tenth diode D10 anode links to each other with the 9th NMOS pipe Q9 source electrode, negative electrode links to each other with drive coil L1 with the tenth NMOS pipe Q10 drain electrode respectively; Described the 14 diode D14 anode links to each other with the 11 NMOS pipe Q10 source electrode, negative electrode links to each other with drive coil L1 with the 12 NMOS pipe Q12 drain electrode respectively.The tenth diode D10 and the 14 diode D14 can play the effect of insulation blocking.
As shown in Figure 2, described motor driving module 6 also comprises the 9th diode D9, the 11 diode D11, the 13 diode D13 and the 15 diode D15, described the 9th diode D9 negative electrode is connected between the 28 resistance R 28 and the 9th NMOS pipe Q9 grid, anode links to each other with the tenth diode D10 negative electrode, described the 11 diode D11 anode links to each other with the tenth diode D10 negative electrode, negative electrode links to each other with the 9th NMOS pipe Q9 drain electrode, described the 15 diode D15 negative electrode is connected between the 35 resistance R 35 and the 11 NMOS pipe Q11 grid, anode links to each other with the tenth tetrode D14 negative electrode, and described the 13 diode D13 anode links to each other with the tenth tetrode D14 negative electrode, negative electrode links to each other with the 11 NMOS pipe Q11 drain electrode.The 9th diode D9, the 11 diode D11, the 13 diode D13 and the 15 diode D15 can prevent that the 9th NMOS pipe Q9 and the tenth NMOS pipe Q10 from burning out because of high electric current.
Boost module 3 mainly is the grid step voltage that promotes the last brachium pontis metal-oxide-semiconductor (Q9, Q11) of H bridge drive circuit.As shown in Figure 2, boost module 3 comprises the 9th resistance R the 9, the 15 capacitor C 15, the first triode Q1, the 4th resistance R 4, the 3rd resistance R 3, second capacitor C 2, the 7th diode D7, the 6th diode D6, first capacitor C 1.The first triode Q1 emitter grounding, base stage by the 15 capacitor C 15 link to each other with second pin of control module 8 with the 9th resistance R 9, collector electrode links to each other with the 3rd resistance R 3 first ends, second capacitor C, 2 first ends respectively.Second capacitor C, 2 second ends link to each other with the 6th diode D6 negative electrode, the 7th diode D7 anode respectively, and the 6th diode D6 anode links to each other with first capacitor C, 1 first end, the 3rd resistance R 3 respectively, the 7th diode D7 negative electrode and the coupling of first capacitor C, 1 second end.Described the 4th resistance R 4 is connected across between the base stage and collector electrode of the first triode Q1, is the upper offset resistance of the first triode Q1.Boost module 3 utilizes the frequency of oscillation of fan self running, boosts by voltage multiplying rectifier.
As shown in Figure 2, boost module 3 also comprises the first voltage-stabiliser tube ZD1 and the 17 diode D17; The first voltage-stabiliser tube ZD1 is connected across first capacitor C, 1 two ends, and the 17 diode D17 plus earth, negative electrode link to each other with the first triode Q1 base stage.The 17 diode D17 provides charging and discharging circuit for the 15 capacitor C 15.
The principle of boosting of boost module 3 is summarized as follows:
Control module 8 has the output of four ports to connect drive circuit, from wherein one the tunnel taking out pulse signal, is coupled to the base stage of the first triode Q1 through the 9th resistance R the 9, the 15 capacitor C 15, controls opening or closing motion of the first triode Q1.
Second pin of control module 8 is exported high/low switching levels, is coupled to the base stage of the first triode Q1 by the 9th resistance R the 9, the 15 capacitor C 15.Triode Q1 is coupled to the 6th diode D6 and the 7th diode D7 with the signal amplification by capacitor C 2.The 6th diode D6, the 7th diode D7, first capacitor C 1, the 3rd resistance R 3, second capacitor C, 2 mutual group become voltage doubling rectifing circuit, carry out being flowed by repoussage.
When Q1 opened, AC power connect second capacitor C, 2 positive poles through voltage transformation module 1, and second capacitor C, 2 negative poles arrive ground by collector electrode and the emitter-base bandgap grading of the first triode Q1, and second capacitor C, 2 two ends are charged to voltage VCC.When the first triode Q1 closes, second capacitor C, 2 negative poles connect voltage transformation module 1 through the 3rd resistance R 3, because the voltage at second capacitor C, 2 two ends can not suddenly change, so the voltage of second capacitor C, 2 positive poles is elevated, this voltage is through the 7th diode D7, and after the first voltage-stabiliser tube ZD1 voltage stabilizing, 1 filtering of first capacitor C, obtain a booster power that exceeds supply voltage, finally offer the power supply after required the boosting of the 9th NMOS pipe Q9 and the 11 NMOS pipe Q11 (NMOS) saturation conduction.The first voltage-stabiliser tube ZD1 plays the protective effect of boosting, and guarantees that boost module 3 reaches and maintains in the normal voltage, and the grid G utmost point required voltage of the 9th NMOS pipe Q9 and the 11 NMOS pipe Q11 is provided.
As shown in Figure 1, 2, the described control circuit that directly connects the brush-less fan of AC mains supply, also comprise PWM control module 2, be coupled to a port of control module 8 after the output stack of the output of PWM control module 2 and hall device 7, the hall signal of the pwm signal of 8 pairs of PWM control modules of control module, 2 outputs and hall device 7 outputs is distinguished, and gives motor driving module 6 according to the control signal of pwm signal output duty cycle and frequency adjustable.Reach the purpose of regulation and control rotation speed of the fan like this.
As shown in Figure 2, PWM control module 2 comprises optocoupler PC1, the 51 resistance R 51, second resistance R 2 and the 8th diode D8, optocoupler PC1 input is connected to direct current, optocoupler PC1 first output is coupled through the 51 resistance R 51 and Voltage stabilizing module 4 outputs, optocoupler PC1 second output is through second resistance R, 2 ground connection, and the 8th diode D8 anode is connected between optocoupler PC1 second output and second resistance R 2, negative electrode and control module 8 are coupled.
As shown in Figure 2, PWM control module 2 also comprises the 4th voltage-stabiliser tube ZD4, the 50 resistance R 50 and the 13 capacitor C 13 and the 53 resistance R 53, the 4th voltage-stabiliser tube ZD4 is connected across second resistance R, 2 two ends, the 50 resistance R 50 is connected between second resistance R 2 and the 8th diode D8 anode, the 13 capacitor C 13 1 ends are connected between the 50 resistance R 50 and the 8th diode D8 anode, other end ground connection, and the 53 resistance R 53 1 ends link to each other with the 8th diode D8 negative electrode, other end ground connection.
An IO mouth (3 pin) of hall device 7 and the shared control module 8 of PWM control module 2 input two paths of signals, its operation principle is as follows: the HALL signal that hall device 7 exports control module 8 to is that high/low (VH/VL) level changes, and PWM control module 2 exports the pwm control signal of control module 8 to for being lower than a peaked direct voltage of control module 8 port input low levels (VIL), for example, control module 8 port input voltages will be judged as low level during less than 1.2V, and then to export the direct voltage of the pwm control signal of control module 8 to be 0-1.0V to PWM control module 2.After the two paths of signals stack, 8 pairs of signals of control module are got the high-low level variation and are promptly obtained the HALL signal, and the low level of signal is carried out the AD sampling, and then can obtain the magnitude of voltage of pwm control signal, handle the dutyfactor value that then can be reduced into pwm control signal through control module 8.
Optocoupler PC1 can make forceful electric power separate with light current.The 4th voltage-stabiliser tube ZD4 can eliminate the electric voltage exception peak value, shields.The 8th diode D8 is used for isolating, and protection HALL high level can not impact pwm control signal.
The operation principle of PWM control module 2 is: pwm signal is through the light-emitting diode of the 52 resistance R 52 control optocoupler PC1 inside, and then the output of control optocoupler PC1.The DC power supply of Voltage stabilizing module 4 outputs is through the 51 resistance R 51, optocoupler PC1 output, 13 chargings of 50 pairs the 13 capacitor C of second resistance R the 2, the 50 resistance R during optocoupler PC1 opening state.The 13 capacitor C 13 is discharged through the 50 resistance R 50, second resistance R 2 during optocoupler PC1 closed condition, and obtains a direct current voltage on the 13 capacitor C 13, and the height of this point voltage is directly proportional with the size of PWM input duty cycle.
As shown in Figure 1, 2, the described control circuit that directly connects the brush-less fan of AC mains supply also comprises overcurrent protection module 5, and overcurrent protection module 5 is coupling between motor driving module 6 and the control module 8.When the 9th NMOS of motor driving module 6 pipe Q9, the 12 NMOS pipe Q12 conducting, electric current is managed Q12 through the 9th NMOS pipe Q9, drive coil L1, the 12 NMOS, arrives overcurrent protection module 5.When the fluctuation of line voltage or start moment or the variation of load causes electric current excessive; overcurrent protection module 5 is gathered corresponding signal and is exported to control module 8; control module 8 is after over-sampling and data processing; regulate output duty cycle to motor driving module 6 output controlling signal; perhaps close motor driving module 6, thereby realize protection.
Above content be in conjunction with concrete preferred implementation to further describing that the utility model is done, can not assert that concrete enforcement of the present utility model is confined to these explanations.For the utility model person of an ordinary skill in the technical field, under the prerequisite that does not break away from the utility model design, can also make some simple deduction or replace, all should be considered as belonging to protection range of the present utility model.

Claims (10)

1. a control circuit that directly connects the brush-less fan of AC mains supply is characterized in that: comprise voltage transformation module (1), boost module (3), Voltage stabilizing module (4), control module (8), motor driving module (6), hall device (7); Described voltage transformation module (1) is rectified into DC power supply with electric main and exports Voltage stabilizing module (4), boost module (3) and motor driving module (6) to, described Voltage stabilizing module (4) carries out voltage stabilizing with described DC power supply and exports hall device (7) to and control module (8), and described boost module (3) boosts DC power supply and exports motor driving module (6) to;
The phase signal of the motor rotor of described hall device (7) detection brush-less fan also exports control module (8) to, and described control module (8) is handled described phase signal and obtained switching signal and export motor driving module (6) to and boost module (3);
Described motor driving module (6) comprises the H bridge drive circuit of being made up of the 9th NMOS pipe (Q9), the tenth NMOS pipe (Q10), the 11 NMOS pipe (Q11), the 12 NMOS pipe (Q12) and drive coil (L1), and described drive coil (L1) end is coupling between the 9th NMOS pipe (Q9) and the tenth NMOS pipe (Q10), the other end is coupling between the 11 NMOS pipe (Q11) and the 12 NMOS pipe (Q12).
2. the control circuit that directly connects the brush-less fan of AC mains supply according to claim 1 is characterized in that: described boost module (3) comprises the 9th resistance (R9), the 15 electric capacity (C15), first triode (Q1), the 4th resistance (R4), the 3rd resistance (R3), second electric capacity (C2), the 7th diode (D7), the 6th diode (D6), first electric capacity (C1); Described first triode (Q1) emitter grounding, base stage are coupled with the 3rd resistance (R3) first end, second electric capacity (C2), first end respectively with control module (8) coupling, collector electrode by the 15 electric capacity (C15) and the 9th resistance (R9); Described second electric capacity (C2) second end is coupled with the 6th diode (D6) negative electrode, the 7th diode (D7) anode respectively, described the 6th diode (D6) anode is coupled with first electric capacity (C1), first end, the 3rd resistance (R3) respectively, described the 7th diode (D7) negative electrode and the coupling of first electric capacity (C1), second end, described the 4th resistance (R4) is connected across between the base stage and collector electrode of first triode (Q1).
3. the control circuit that directly connects the brush-less fan of AC mains supply according to claim 2 is characterized in that: described boost module (3) also comprises first voltage-stabiliser tube (ZD1) and the 17 diode (D17); Described first voltage-stabiliser tube (ZD1) is connected across first electric capacity (C1) two ends, and described the 17 diode (D17) plus earth, negative electrode link to each other with first triode (Q1) base stage.
4. according to the arbitrary described control circuit that directly connects the brush-less fan of AC mains supply of claim 1-3, it is characterized in that: described motor driving module (6) also comprises the first protection branch road and the second protection branch road; Grid and the tenth NMOS that the described first protection branch road is coupling in the 9th NMOS pipe (Q9) manage between the grid of (Q10), are used to make the 9th NMOS pipe (Q9) and the tenth NMOS pipe (Q10) not open-minded simultaneously; Grid and the 12 NMOS that the described second protection branch road is coupling in the 11 NMOS pipe (Q11) manage between the grid of (Q12), are used to make the 11 NMOS pipe (Q11) and the 12 NMOS pipe (Q12) not open-minded simultaneously.
5. the control circuit that directly connects the brush-less fan of AC mains supply according to claim 4 is characterized in that: the described first protection branch road comprises the 28 resistance (R28), the 21 diode (D21), the 31 resistance (R31), the 24 resistance (R24), the 4th triode (Q4), the 30 resistance (R30), the 5th triode (Q5), the 29 resistance (R29); After linking to each other, described the 28 resistance (R28), the 21 diode (D21), the 31 resistance (R31) is coupling between described the 9th NMOS pipe (Q9) grid and the 4th triode (Q4) base stage, described the 4th triode (Q4) base stage is also by the 24 resistance (R24) and control module (8) coupling, described the 4th triode (Q4) collector electrode is coupled described the 4th triode (Q4) ground connection by the 30 resistance (R30) and the 5th triode (Q5) base stage; Described the 5th triode (Q5) collector electrode and Voltage stabilizing module (4) output are coupled, described the 5th triode (Q5) emitter-base bandgap grading is coupled to the grid of the tenth NMOS pipe (Q10), and described the 29 resistance (R29) is coupling between the collector electrode and base stage of the 5th triode (Q5);
The described second protection branch road comprises the 35 resistance (R35), the 22 diode (D22), the 38 resistance (R38), the 25 resistance (R25), the 7th triode (Q7), the 37 resistance (R37), the 8th triode (Q8), the 36 resistance (R36); After linking to each other, described the 35 resistance (R35), the 22 diode (D22), the 38 resistance (R38) is coupling between described the 11 NMOS pipe (Q9) grid and the 7th triode (Q7) base stage, described the 7th triode (Q7) base stage is also by the 25 resistance (R25) and control module (8) coupling, described the 7th triode (Q7) collector electrode is coupled described the 7th triode (Q7) ground connection by the 37 resistance (R37) and the 8th triode (Q8) base stage; Described the 8th triode (Q8) collector electrode and Voltage stabilizing module (4) output are coupled, described the 8th triode (Q8) emitter-base bandgap grading is coupled to the grid of the 12 NMOS pipe (Q12), and described the 36 resistance (R36) is coupling between the collector electrode and base stage of the 8th triode (Q8).
6. the control circuit that directly connects the brush-less fan of AC mains supply according to claim 5, it is characterized in that: described motor driving module (6) also comprises the tenth diode (D10) and the 14 diode (D14), and described the tenth diode (D10) anode and the 9th NMOS manage that (Q9) source electrode links to each other, negative electrode links to each other with drive coil (L1) with the tenth NMOS pipe (Q10) drain electrode respectively; Described the 14 diode (D14) anode links to each other with the 11 NMOS pipe (Q10) source electrode, negative electrode links to each other with drive coil (L1) with the 12 NMOS pipe (Q12) drain electrode respectively.
7. the control circuit that directly connects the brush-less fan of AC mains supply according to claim 6, it is characterized in that: described motor driving module (6) also comprises the 9th diode (D9), the 11 diode (D11), the 13 diode (D13) and the 15 diode (D15), described the 9th diode (D9) negative electrode is connected between the 28 resistance (R28) and the 9th NMOS pipe (Q9) grid, anode links to each other with the tenth diode (D10) negative electrode, described the 11 diode (D11) anode links to each other with the tenth diode (D10) negative electrode, negative electrode is managed (Q9) drain electrode with the 9th NMOS and is linked to each other, described the 15 diode (D15) negative electrode is connected between the 35 resistance (R35) and the 11 NMOS pipe (Q11) grid, anode links to each other with the tenth tetrode (D14) negative electrode, and described the 13 diode (D13) anode links to each other with the tenth tetrode (D14) negative electrode, negative electrode links to each other with the 11 NMOS pipe (Q11) drain electrode.
8. according to the arbitrary described control circuit that directly connects the brush-less fan of AC mains supply of claim 1-3, it is characterized in that: also comprise PWM control module (2), be coupled to a port of control module (8) after the output stack of the output of described PWM control module (2) and described hall device (7), described control module (8) is distinguished the pwm signal of PWM control module (2) output and the hall signal of hall device (7) output, and gives motor driving module (6) according to the control signal of pwm signal output duty cycle and frequency adjustable.
9. the control circuit that directly connects the brush-less fan of AC mains supply according to claim 8, it is characterized in that: described PWM control module (2) comprises optocoupler (PC1), the 51 resistance (R51), second resistance (R2) and the 8th diode (D8), described optocoupler (PC1) input is connected to direct current, described optocoupler (PC1) first output is coupled through the 51 resistance (R51) and Voltage stabilizing module (4) output, described optocoupler (PC1) second output is through second resistance (R2) ground connection, and described the 8th diode (D8) anode is connected between optocoupler (PC1) second output and second resistance (R2), negative electrode and control module (8) are coupled.
10. the control circuit that directly connects the brush-less fan of AC mains supply according to claim 9, it is characterized in that: described PWM control module (2) also comprises the 4th voltage-stabiliser tube (ZD4), the 50 resistance (R50) and the 13 electric capacity (C13) and the 53 resistance (R53), described the 4th voltage-stabiliser tube (ZD4) is connected across second resistance (R2) two ends, described the 50 resistance (R50) is connected between second resistance (R2) and the 8th diode (D8) anode, described the 13 electric capacity (C13) end is connected between described the 50 resistance (R50) and the 8th diode (D8) anode, other end ground connection, described the 53 resistance (R53) end links to each other with the 8th diode (D8) negative electrode, other end ground connection.
CNU2008202141146U 2008-11-27 2008-11-27 Control circuit of brushless fan directly connected with AC commercial power source Expired - Fee Related CN201319578Y (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103259469A (en) * 2013-04-19 2013-08-21 杭州微光电子股份有限公司 Electronic commutation brushless direct current and single phase fan circuit and control method thereof
CN107994546A (en) * 2017-12-15 2018-05-04 南京理工大学 A kind of AGV bridge-type motor drivers
CN109654056A (en) * 2019-01-30 2019-04-19 阿宜准(惠州)电子科技有限公司 A kind of double motor fan control circuitry
CN111708425A (en) * 2020-05-22 2020-09-25 广州裕芯电子科技有限公司 Portable fan control chip, circuit and method integrating indication function

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103259469A (en) * 2013-04-19 2013-08-21 杭州微光电子股份有限公司 Electronic commutation brushless direct current and single phase fan circuit and control method thereof
CN107994546A (en) * 2017-12-15 2018-05-04 南京理工大学 A kind of AGV bridge-type motor drivers
CN109654056A (en) * 2019-01-30 2019-04-19 阿宜准(惠州)电子科技有限公司 A kind of double motor fan control circuitry
CN109654056B (en) * 2019-01-30 2024-05-14 阿宜准(惠州)电子科技有限公司 Dual-motor fan control circuit
CN111708425A (en) * 2020-05-22 2020-09-25 广州裕芯电子科技有限公司 Portable fan control chip, circuit and method integrating indication function

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