TW201440397A - Driving circuit for vibration motor and driving method for vibration motor - Google Patents

Abstract

The present invention provides a driving circuit for a vibration motor and a driving method for the vibration motor. The driving circuit comprises: a detecting unit, coupled to the vibration motor, for detecting rotating position and rotating speed of the vibration motor and accordingly generating a detecting result; and a control unit, coupled to the detecting unit and the vibration motor, for controlling acceleration and deceleration of the vibration motor according to the detecting result. The driving method comprises: providing a detecting unit for detecting rotating position and rotating speed of the vibration motor and accordingly generating a detecting result; and providing a control unit for controlling acceleration and deceleration of the vibration motor according to the detecting result.

Description

Drive circuit for vibration motor and drive method for vibration motor

The present invention relates to a driving circuit and a driving method, and more particularly to a driving circuit for a vibration motor and a driving method for the vibration motor.

In general, the conventional technique is to make a vibration motor having a large vibration force by increasing the mass or the radius of rotation of the vibration motor. However, the conventional technique of increasing the mass or the radius of rotation of the vibration motor also causes the vibration motor to start. The time required is much higher, or even the vibration motor can be damaged at startup.

In addition, a fan motor having vibration is disclosed in the prior art Chinese patent CN 2786857Y. However, such a conventional fan motor requires an additional eccentric magnetic pole to have a vibration function, and therefore needs to be improved a lot. The cost of hardware.

In view of the above, the main object of the present invention is to provide a driving circuit for a vibration motor and a driving method for the same, the driving circuit and the driving method can make the vibration motor without increasing the mass and the radius of rotation In this case, it is also possible to have a large vibration force to solve the aforementioned problems.

According to an embodiment of the invention, a driving circuit for a vibration motor is disclosed, the driving circuit comprising: a detecting unit and a control unit. The detecting unit is coupled to The vibration motor is configured to detect a rotational position and a rotational speed of the vibration motor and generate a detection result according to the detection; and the control unit is coupled to the detection unit and the vibration motor, and is configured to use the detection The measurement results control the acceleration and deceleration of the vibration motor.

According to an embodiment of the present invention, a driving method for a vibration motor is disclosed. The driving method includes: providing a detecting unit for detecting a rotational position and a rotating speed of the vibration motor and generating a detect And measuring a result; and providing a control unit for controlling acceleration and deceleration of the vibration motor according to the detection result.

In summary, the driving circuit and the driving method disclosed in the present invention can enable the vibration motor to have a large vibration force without increasing the mass and the radius of rotation.

100‧‧‧ drive circuit

102‧‧‧Detection unit

104‧‧‧Control unit

106‧‧‧First drive switch

108‧‧‧Second drive switch

200‧‧‧Vibration motor

1 is a simplified block diagram of a drive circuit for a vibration motor in accordance with an embodiment of the present invention.

FIG. 2 is a schematic diagram of a first driving waveform and a second driving waveform of the driving circuit according to the present invention.

Figure 3 is a simplified timing diagram of the acceleration and deceleration of a drive circuit during an operating period in accordance with an embodiment of the present invention.

Figure 4 is a simplified timing diagram of the acceleration and deceleration of a drive circuit in a start-up period in accordance with an embodiment of the present invention.

FIG. 5 is a schematic diagram of the first driving waveform and a third driving waveform of the driving circuit having the additional vibration force in the vertical direction according to the present invention.

Figure 6 is a flow chart showing an embodiment of the driving method for a vibration motor of the present invention in accordance with the operation of the above-described driving circuit.

Certain terms are used throughout this specification and the following claims to refer to particular elements, and those of ordinary skill in the art should understand that the hardware manufacturer may refer to the same element by a different noun. The scope of the specification and the subsequent patent application does not use the difference in name as the means of distinguishing the elements, but the difference in the function of the elements as the criterion for distinguishing, as mentioned in the entire specification and subsequent claims. "Includes" is an open-ended term and should be interpreted as "including but not limited to". In addition, the term "coupled" is used in this context to include any direct and indirect electrical connection means. Depicting a first device coupled to a second device means that the first device can be directly electrically connected to the second device or indirectly electrically connected to the second device through other devices or connection means.

Please refer to FIG. 1 . FIG. 1 is a simplified block diagram of a driving circuit 100 for a vibration motor 200 according to an embodiment of the present invention. As shown in FIG. 1 , the driving circuit 100 includes A detecting unit 102, a control unit 104, a first driving switch 106, and a second driving switch 108. The detecting unit 102 is coupled to the vibration motor 200 and configured to detect the rotational position and the rotational speed of the vibration motor 200 and generate a detection result accordingly. The control unit 104 is coupled to the detecting unit 102 and the vibration motor 200, and is configured to control the acceleration and deceleration of the vibration motor 200 according to the detection result. The first driving switch 106 and the second driving switch 108 are coupled between a power terminal of the vibration motor 200 and the control unit 104, wherein the control unit 104 utilizes the first driving switch 106 and the second driving switch according to the detection result. 108 controls the vibration motor 200 to periodically accelerate and decelerate, and the detection result includes a rotational position corresponding to a specific rotation angle of the vibration motor 200. It should be noted that the above-described embodiments are merely illustrative of the present invention, and are not limitations of the present invention. For example, the vibration motor 200 may have a single coil configured with two inverters, and further, when the vibration motor 200 When there is no eccentric structure (for example, a fan), the detection result does not include a rotational position corresponding to a specific rotation angle of the vibration motor 200.

Please refer to FIG. 2 , which is a schematic diagram of a first driving waveform and a second driving waveform of the driving circuit 200 according to the present invention. The first driving waveform diagram shows the driving circuit 100 . A normal operating mode, and the second driving waveform diagram shows a first vibration mode of the driving circuit 100. As shown in FIG. 2, when the drive circuit 100 is driven forward, the control unit 104 controls the vibration motor 200 to accelerate, and when the drive circuit 100 is driven backward, the control unit 104 controls the vibration motor 200 to decelerate, and when the drive circuit When the 100 is not driven, the control unit 104 does not control the vibration motor 200 to accelerate or decelerate (that is, the vibration motor 200 has no acceleration from the coil and no deceleration from the coil), wherein the non-driving is a general term and may include resistance of air or the like, and For example, a more detailed control interval of kick-back noise suppression, reverse recovery charge recycling, etc., the difference between the normal operation mode of the control unit 104 and the first vibration mode is in a During a specific period, the driving circuit 100 is driven forward in the normal operation mode (that is, the control unit 104 controls the vibration motor 200 to accelerate), and the driving circuit 100 is driven backward in the first vibration mode (ie, the control unit). The 104 series controls the vibration motor 200 to decelerate as shown in Fig. 2. Alternatively, during another specific period, the drive circuit 100 is driven forward in the normal operation mode (ie, the control unit 104 controls the vibration motor 200 to accelerate), and the drive circuit 100 is different in the first vibration mode. The phase is driven backward (ie, the control unit 104 controls the vibration motor 200 to decelerate at different points in time) as shown in FIG. Further, the deceleration period shown in FIG. 2 may vary with the center of mass connected to a base (not shown) of the vibration motor 200. For example, when the center of mass of the susceptor is different or changed, the deceleration period may be changed from the third phase and the seventh phase shown in FIG. 2 to the first phase and the fifth phase.

Please refer to FIG. 3, which is a simplified timing diagram of the acceleration and deceleration of the driving circuit 200 in an operating period according to an embodiment of the present invention, wherein the third figure may be 2 The integration result of one of the second driving waveforms in the figure. As shown in Figure 3 As shown, when the detecting unit 102 detects that the vibration motor 200 is in a first rotational position and has a first rotational speed V1, and accordingly generates a first detection result, the control unit 104 turns on the first The switch 106 is driven to control the vibration motor 200 to accelerate. Then, when the detecting unit 102 detects that the vibration motor 200 has a second rotation speed V2 and generates a second detection result, the control unit 104 turns off the first driving. The switch 106 controls the vibration motor 200 to stop accelerating. Then, when the detecting unit 102 detects that the vibration motor 200 has a second rotation speed V2 and generates a third detection result, the control unit 104 turns on the second driving switch. 108 to control the vibration motor 200 to decelerate. Then, when the detecting unit 102 detects that the vibration motor 200 has a first rotation speed V1 and generates a fourth detection result, the control unit 104 turns off the second driving switch. 108 controls the vibration motor 200 to stop deceleration. As a result, the vibration motor 200 can have a large vibration force without increasing the mass and the radius of rotation, wherein the vibration motor 200 has a greater vibrational force particularly in a specific direction corresponding to the acceleration.

In addition, please refer to FIG. 4, which is a simplified timing diagram of the acceleration and deceleration of the driving circuit 200 in a start-up period according to an embodiment of the present invention, as shown in FIG. As shown, the control unit 104 controls the acceleration and deceleration of the vibration motor 200 (ie, the control unit 104 controls the vibration motor 200 to periodically accelerate and decelerate according to the detection result) such that a rotation rate of the vibration motor 200 is gradually increased. Increase to a target rotation rate value Vt. It should be noted that the above-described embodiments are merely illustrative of the present invention, and are not limitations of the present invention, for example, when the vibration motor 200 does not have an eccentric structure (for example, a fan), and is in the vibration motor 200. During a start-up period, the control unit 104 controls the acceleration and deceleration of the vibration motor 200 such that a rate of rotation of the vibration motor 200 is gradually reduced to a target rate of rotation value.

In addition, it should be noted here that the above embodiments are merely illustrative of the present invention, and It is not a limitation of the present invention. For example, the driving circuit 100 may further include an inductor such that the vibration motor 200 has an additional vibration force in the vertical direction which is not available in the prior art. For example, please refer to FIG. FIG. 5 is a schematic diagram of the first driving waveform and a third driving waveform diagram of the driving circuit 200 having the additional vibration power in the vertical direction according to the present invention, wherein the first driving waveform is schematic. A normal operating mode of the driving circuit 100 is shown, and the third driving waveform diagram shows a second vibration mode of the driving circuit 100. As shown in FIG. 5, when the drive circuit 100 is driven forward, the control unit 104 controls the vibration motor 200 to accelerate, and when the drive circuit 100 is driven backward, the control unit 104 controls the vibration motor 200 to decelerate, and when the drive circuit When 100 is not driven (general reference, same as above), the control unit 104 does not control the vibration motor 200 to accelerate or decelerate (that is, the vibration motor 200 does not accelerate or decelerate), and the normal operation mode of the control unit 104 and the second vibration mode The difference is that during a certain period of time, the driving circuit 100 is driven forward in a normal phase in the normal operating mode (ie, the control unit 104 outputs a driving signal to the vibration motor 200 at the normal phase), and In the second vibration mode, the driving circuit 100 is driven in a relatively advanced phase and in a later phase (that is, the control unit 104 is in a front phase and outputs a phase in a later phase. The same drive signal is given to the vibration motor 200) to utilize the difference in phase to produce a vertical force, as shown in FIG. Alternatively, in another specific period, the driving circuit 100 is driven forward in the normal operating mode (ie, the control unit 104 outputs a driving signal to the vibration motor 200 at the normal phase), and the driving circuit 100 is in the first In the two-vibration mode, the drive is driven forward in a preceding phase and driven backwards in a later phase (ie, the control unit 104 is different from the previous phase and two outputs at a later phase). The drive signal is applied to the vibration motor 200) to utilize the difference in phase to produce a vertical force, as shown in FIG.

Please refer to FIG. 6 , which is a flow chart illustrating an embodiment of the driving method for a vibration motor of the present invention according to the operation mode of the driving circuit 100 described above, if substantially With the same result, the steps in the process do not necessarily need to be as shown in Figure 6. The order of execution is not necessarily continuous, that is, other steps can be inserted between these steps. The driving method of the present invention comprises the following steps: Step 400: Start.

Step 410: A detecting unit is provided for detecting a rotational position and a rotational speed of the vibration motor and generating a detection result accordingly.

Step 420: Provide a control unit for controlling acceleration and deceleration of the vibration motor according to the detection result.

In the above flowchart of the present invention, the driving method of the present invention may further include: providing a plurality of driving switches coupled between the power terminal of the vibration motor and the control unit, wherein the acceleration and deceleration of the vibration motor are controlled The step of using the plurality of drive switches to control the acceleration and deceleration of the vibration motor according to the detection result.

It should be noted that the above embodiments are merely illustrative of the present invention, and are not limitations of the present invention. For example, the detection result may include a detected specific rotation angle corresponding to the vibration motor. The position of the rotation. Further, when the vibration motor 200 does not have an eccentric structure (for example, a fan), the detection result does not include a rotational position corresponding to a specific rotation angle of the vibration motor 200. In addition, the step of controlling the acceleration and deceleration of the vibration motor may include controlling the vibration motor to periodically accelerate and decelerate according to the detection result. Further, in a start-up period of the vibration motor, the step of controlling the acceleration and deceleration of the vibration motor controls the acceleration and deceleration of the vibration motor such that a rotation rate of the vibration motor is gradually increased to one. a target rotation rate value; and during an operating period of the vibration motor, the step of controlling acceleration and deceleration of the vibration motor controls acceleration and deceleration of the vibration motor such that a rotation rate of the vibration motor is at a first The rotation rate value is alternately switched between a second rotation rate value.

In summary, the driving circuit and the driving method disclosed in the present invention can enable the vibration motor to have a large vibration force without increasing the mass and the radius of rotation. In addition, the driving circuit and the driving method disclosed in the present invention can have a vibration function without an additional eccentric magnetic pole, as compared with the prior art Chinese Patent CN 2786857Y, so the present invention can Reduce the cost of hardware.

The above are only the preferred embodiments of the present invention, and all changes and modifications made to the scope of the present invention should be within the scope of the present invention.

100‧‧‧ drive circuit

102‧‧‧Detection unit

104‧‧‧Control unit

106‧‧‧First drive switch

108‧‧‧Second drive switch

200‧‧‧Vibration motor

Claims (14)

A driving circuit for a vibration motor includes: a detecting unit coupled to the vibration motor for detecting a rotational position and a rotational speed of the vibration motor and generating a detection result according to the detection; and a control The unit is coupled to the detecting unit and the vibration motor for controlling acceleration and deceleration of the vibration motor according to the detection result. The driving circuit of claim 1, wherein the control unit controls the vibration motor to periodically accelerate and decelerate according to the detection result. The driving circuit of claim 2, wherein in a start-up period of the vibration motor, the control unit controls acceleration and deceleration of the vibration motor to gradually increase a rotation rate of the vibration motor The ground is raised to a target rotation rate value. The driving circuit of claim 2, wherein during the operating period of the vibration motor, the control unit controls acceleration and deceleration of the vibration motor such that a rotation rate of the vibration motor is at the first The rotation rate value is alternately switched between a second rotation rate value. The driving circuit of claim 2, wherein the vibration motor does not have an eccentric structure, and during a startup of the vibration motor, the control unit controls acceleration and deceleration of the vibration motor to A rate of rotation of the vibrating motor is gradually reduced to a target rate of rotation value. The driving circuit of claim 5, wherein the vibration motor is a fan. The driving circuit of claim 1, further comprising: a plurality of driving switches coupled between a power terminal of the vibration motor and the control unit; wherein the control unit utilizes the detection result according to the detection result The plurality of drive switches control acceleration and deceleration of the vibration motor. The driving circuit of claim 1, wherein the detection result includes a rotation position corresponding to a specific rotation angle of the vibration motor. The driving circuit of claim 1, wherein the driving circuit has a normal operation mode and a vibration mode, and the difference between the normal operation mode of the control unit and the vibration mode is that during a specific period, The drive circuit is driven forward in the normal operation mode, and the drive circuit is driven backward in the vibration mode. The drive circuit of claim 9, wherein the specific period of time changes with a center of mass connected to a base of the vibration motor. The driving circuit of claim 1, wherein the driving circuit has a normal operation mode and a vibration mode, and the difference between the normal operation mode of the control unit and the vibration mode is that during a specific period, The drive circuit is driven forward in the normal operation mode, and the drive circuit is driven backwards in different phases in the vibration mode. The drive circuit of claim 11, wherein the specific period of time changes with a center of mass connected to a base of the vibration motor. The driving circuit of claim 1, wherein the driving circuit has a normal operation mode and a vibration mode, and the difference between the normal operation mode of the control unit and the vibration mode is that during a specific period, The drive circuit is in a normal phase in the normal operating mode The bit is driven forward, and the drive circuit is driven in a front-end phase and a later phase in the vibration mode to utilize a difference in phase to generate a vertical force. The driving circuit of claim 1, wherein the driving circuit has a normal operation mode and a vibration mode, and the difference between the normal operation mode of the control unit and the vibration mode is that during a specific period, The driving circuit is driven forward in a normal phase in the normal operating mode, and the driving circuit is driven forward in a front phase in the vibration mode and driven backward in a later phase to utilize The difference in phase produces a vertical force.