CN201656887U - Forward and reverse rotation control circuit device of direct current fan - Google Patents

Abstract

A positive and negative rotation control circuit device of a direct current fan is electrically connected with a stator coil of the direct current fan and comprises a control unit, a power supply and a trigger switch unit, wherein the power supply is electrically connected with the control unit. The trigger switch unit includes the first trigger circuit and the second trigger circuit connected separately to the Hall IC and the power source of the control unit, and the first trigger circuit and the second trigger circuit are triggered timely to force the reversal of the positive and negative polarities of the power source connected to the Hall IC and to inform the driving IC to control the reversal of the DC fan.

Description

Forward and reverse control circuit device of DC fan

technical field

The utility model relates to a control circuit, in particular to a forward and reverse control circuit device of a DC fan.

Background technique

Referring to Fig. 1, it is PCT No. WO2006/089605 A1 "Method for operation of a two-phase electronically-commutated motor and motor forcarrying out said method" (Method for operation of a two-phase electronically-commutated motor and motor forcarrying out said method), the The motor 10 disclosed in the patent is powered by a DC power supply 11, and the speed control of the motor 10 is controlled by a frequency signal generated by a PWM (pulse width modulation, pulse width modulation) generator 12. When the rotor 13 of the motor 10 rotates, its magnetic field changes It is sensed by a Hall IC (Hall IC) 14 and transmitted to a programmable controller 15 , and the programmable controller 15 provides two output signals 16 and 17 to control the direction of rotation of the motor 10 .

Since the currents of the two output signals 16 and 17 output by the programmable controller 15 must pass through components such as coils 18 or 19, the programmable controller 15 is used to control the direction of the current flowing through the coils 18 or 19 to achieve change The motor 10 produces forward rotation or reverse rotation, however, this control method will cause more components through which current passes, resulting in higher power consumption and higher component costs.

Utility model content

The purpose of the utility model is to provide a DC fan forward and reverse control circuit device with low power consumption, easy control mode and cost reduction.

The positive and negative rotation control circuit device of the DC fan of the utility model is electrically connected with a stator coil of a DC fan, and can output currents that cause the stator coil to generate different magnetic flux directions, and drive the DC fan by inducing the magnet ring of the DC fan. The fan wheel produces rotation in the corresponding direction, and the forward and reverse control circuit device includes:

A control unit, including a driver IC electrically connected to the stator coil and capable of outputting a drive signal, and a driver IC electrically connected to the driver IC and able to sense the magnetic polarity of the magnet ring to notify the driver IC to change the current output to the stator coil direction of Hall IC;

a power source electrically connected to the control unit; and

A trigger switch unit, including a first trigger circuit and a second trigger circuit electrically connected to the Hall IC and the power supply, the first trigger circuit has a first trigger terminal electrically connected to a first switch , a second switch electrically connected between the first switch and the Hall IC, and the second trigger circuit has a third switch electrically connected to the Hall IC and a third switch The second trigger terminal electrically connected to the device, and the first trigger terminal and the second trigger terminal receive the source of the same trigger signal. When the first trigger terminal and the second trigger terminal are not triggered, the first switch The device and the three switches are not conducting, the second switch is conducting, the Hall IC notifies the drive IC to control the DC fan to rotate in a specific direction, and at the same time at the first trigger terminal and the second trigger terminal When triggered by a trigger signal, the first switch and the third switch are turned on at the same time, the second switch is not turned on, so that the positive and negative polarities of the power supply to which the Hall IC is electrically connected are reversed , and notify the driver IC to control the reverse rotation of the DC fan.

In the forward and reverse control circuit device of the DC fan described in the utility model, the first switch, the second switch, and the third switch are all transistors, and all define a base terminal, an emitter terminal and a collector terminal. A trigger terminal is taken from the base terminal of the first switch, and the second trigger terminal is taken from the base terminal of the third switch.

In the forward and reverse control circuit device of the DC fan described in the utility model, the collector terminal of the first switch and the collector terminal of the second switch are respectively connected to a resistor and then jointly connected to the power supply.

The beneficial effect of the utility model is: by simultaneously triggering the first trigger of the first trigger circuit and the second trigger terminal of the second trigger circuit, the positive and negative polarities of the power supply electrically connected to the Hall IC are directly forced to reverse , so that the Hall IC can notify the drive IC to control the reverse rotation of the DC fan. Since the utility model only switches the positive and negative polarities of the power supply of the Hall IC in a timely manner, the positive and negative polarities of the fan can be achieved, so it can effectively The components through which the current passes are reduced, the power consumption is reduced, and the control method is easy, thereby reducing the cost.

Description of drawings

Figure 1 is a circuit diagram illustrating PCT Patent No. WO2006/089605 A1;

Fig. 2 is a block diagram illustrating a preferred embodiment of the forward and reverse control circuit device of the DC fan of the present invention;

FIG. 3 is a circuit diagram to assist in explaining the circuit arrangement of each constituent unit of the preferred embodiment.

Detailed ways

Below in conjunction with accompanying drawing and embodiment the utility model is described in detail.

Referring to Fig. 2 and Fig. 3, it is a preferred embodiment of the forward and reverse control circuit device 2 of the DC fan of the present invention. The forward and reverse control circuit device 2 includes a control unit 21, and a A power supply (Vcc) 22 and a trigger switch unit 23.

The control unit 21 includes a driving IC 211 capable of outputting a driving signal and a Hall IC 212 electrically connected to the driving IC 211 . The power supply (Vcc) 22 is used to supply the power required by each unit. In addition, the trigger switch unit 23 includes a first trigger circuit 231 and a second trigger circuit 232 electrically connected to the Hall IC 212 and the power supply (Vcc) 22 respectively, the first trigger circuit 231 has a The first trigger terminal 233 electrically connected to the switch Q1 and a resistor R6, a second switch Q2 electrically connected between the first switch Q1 and the Hall IC 212, the first switch Q1 and the second switch In this embodiment, the device Q2 is described in the form of a transistor, both of which define a base terminal B, an emitter terminal E and a collector terminal C, and the first trigger terminal 233 is taken from the base of the first switch Q1 terminal B, and the collector terminals C of the first switch Q1 and the second switch Q2 are respectively connected to a resistor R1, R2 and then commonly connected to the power supply (Vcc) 22 . In addition, the second trigger circuit 232 has a third switch Q3 electrically connected to the Hall IC 212 and a second trigger terminal 234 electrically connected to the third switch Q3, and the third switch Q3 is also in the form of a transistor For illustration, it is also defined that there is a base terminal B, an emitter terminal E and a collector terminal C, and the second trigger terminal 234 is connected to the base terminal B of the third switch Q3 through a resistor R7; moreover, the first trigger terminal 234 The terminal 233 and the second trigger terminal 234 receive the source of the same trigger signal. Among them, there are many sources of the trigger signal. For example, assuming that the DC fan of the present invention is a ventilating fan installed between the room and the outside, if the indoor air quality falls within the normal range, the fan operates normally, thereby displacing the outdoor air. If the indoor air quality is poor and exceeds the normal standard, the air quality detection system will send a trigger signal to the trigger switch unit to make the fan reverse and discharge the indoor air to the outside.

Referring to Fig. 2 and Fig. 3, in use, the forward and reverse control circuit device 2 is applied to control the fan wheel 33 of the DC fan to produce forward and reverse rotation, and the output pin of the drive IC 211 is connected to the stator coil 31 of the DC fan. connected, and the first trigger terminal 233 and the second trigger terminal 234 of the trigger switch unit 23 are connected to a control system connected to the DC fan. When the control system does not send a trigger signal, the first switch Both Q1 and the third switch Q3 are not triggered to conduct, the first switch Q1 and the third switch Q3 are both in the open state, and the second switch Q2 is in the conduction state, at this time the power supply (Vcc) 22 is Input Hall IC212 through resistor R3 and the 4th pin of Hall IC212, at this time, the 4th pin of Hall IC212 is positive +, and the 2nd pin of Hall IC212 is led by the second switch Q2 If it is in a grounded state and is negative, at this time the Hall IC212 will normally notify the driver IC to output current to the stator coil 31 to generate a magnetic flux in a specific direction, and induce the magnet ring 32 of the DC fan to drive the DC fan. The fan wheel 33 rotates in a corresponding direction.

In addition, the control system sends a trigger signal timely according to the needs of the environment to simultaneously trigger the first trigger terminal 233 and the second trigger terminal 234 of the trigger switch unit 23. At this time, the first switch Q1 and the third switch Q3 are both It is turned on to form a ground, and the base B of the second switch Q2 is like an open circuit due to the conduction and ground of the first switch Q1. The pin is input to the Hall IC212 and is positive (+), and the fourth pin of the Hall IC212 connected to the third switch Q3 is in the ground state and is negative (-). In this way, the power supply of the Hall IC212 is directly positive and negative. If the negative polarity is interchanged (the polarity shown in the parentheses in Figure 3 is opposite to the original), then the Hall IC212 will directly notify the drive IC211 to output the stator coil 31 to generate a current opposite to the direction of the aforementioned magnetic flux, and the induction should The magnet ring 32 of the DC fan drives the fan wheel 33 of the DC fan to reverse.

It can be seen from the above description that the forward and reverse control circuit device 2 of the DC fan of the present invention is designed through the above structure, and utilizes the first trigger terminal 233 of the first trigger circuit 231 and the second trigger terminal 234 of the second trigger circuit 232 to be triggered simultaneously, By directly forcing the positive and negative polarity commutation of the power supply to which the Hall IC212 is electrically connected, the Hall IC212 can then notify the drive IC211 to control the reverse rotation of the DC fan, because the utility model only switches the power supply of the Hall IC212 in a timely manner The positive and negative polarities of the DC fan can be reversed, so compared with the above-mentioned prior art, it can effectively reduce the components through which the current passes, so it can effectively reduce the power consumption, and the control method is easy, and can while reducing costs.

Claims (3)

1. the positive and reverse rotation control circuit device of a DC fan, be electrically connected with the stator coil of a DC fan, and can export the electric current that makes this stator coil produce different flow directions, drive the rotation that the impeller of this DC fan produces corresponding direction with the magnet ring of responding to this DC fan, it is characterized in that this positive and reverse rotation control circuit device comprises:

A control unit comprises that a drive IC that is electrically connected with this stator coil and can output drive signal and one are electrically connected the magnetic polarity that also can respond to this magnet ring with this drive IC and export the Hall IC of the sense of current of this stator coil to notify this drive IC change;

A power supply is electrically connected with this control unit; And

A trigger switch unit, comprise one first circuits for triggering and one second circuits for triggering of being electrically connected with this Hall IC and this power supply respectively, these first circuits for triggering have first trigger end that is electrically connected with one first derailing switch, a second switch device that is electrically connected between this first derailing switch and this Hall IC, and these second circuits for triggering have the 3rd derailing switch that is electrically connected with this Hall IC and second trigger end that is electrically connected with the 3rd derailing switch, and make this first trigger end and this second trigger end receive the source of same triggering signal, when this first trigger end and this second trigger end all are not triggered, this first derailing switch and the 3rd not conducting of derailing switch, this then conducting of second switch device, this Hall IC is notified this drive IC to control this DC fan to rotate towards a specific direction, in addition when this first trigger end was triggered by a triggering signal with this second trigger end while, the conducting simultaneously of this first derailing switch and the 3rd derailing switch, this not conducting of second switch device, and make this power supply that this Hall IC is electrically connected just, the negative polarity commutation, and notify this drive IC to control this DC fan counter-rotating.

2. the positive and reverse rotation control circuit device of DC fan according to claim 1, it is characterized in that, described first derailing switch, second switch device, the 3rd derailing switch are transistor, all definition has base terminal, emitter-base bandgap grading end and collector terminal, this first trigger end is taken from the base terminal of this first derailing switch, and this second trigger end is taken from the base terminal of the 3rd derailing switch.

3. the positive and reverse rotation control circuit device of DC fan according to claim 2 is characterized in that, the collector terminal of this first derailing switch is connected a resistor respectively and is connected to this power supply jointly with the collector terminal of this second switch device.

Images