Driving circuit of coil motor and camera module

Abstract

The invention provides a driving circuit of a coil motor, and relates to the field of coil motor control. The driving circuit comprises a power supply module and a charging and discharging module, a first end of the charging and discharging module is connected with a first end of the power supply module, a second end of the charging and discharging module is connected with a first end of a coil motor, and a third end of the charging and discharging module, a second end of the power supply module and a second end of the coil motor are connected; the power supply module is used for providing a first AC signal; the first alternating current signal comprises a first signal and a second signal which are alternately distributed, the first signal is used for charging the charging and discharging module in a charging stage, and the second signal is output to the coil motor in a discharging stage; the charging and discharging module is used for charging under the action of the first signal in a charging stage and outputting a third signal to the coil motor in a discharging stage; the second signal and the third signal are used for jointly driving the coil motor; wherein the second signal and the third signal have the same direction. The force generated by the coil motor can be improved.

Description

Technical Field

[0001] The present application relates to the field of coil motor control, and in particular to a coil motor drive circuit and a camera module. Background Art

[0002] A coil motor is a device that can convert electrical energy into mechanical force. A coil motor usually includes a magnetic component and a coil. By energizing the coil, the energized coil generates mechanical force under the action of the magnetic field generated by the magnetic component. Since the principle of a coil motor is similar to that of a speaker, a coil motor is also called a voice coil motor, which has the characteristics of high frequency response and high precision.

[0003] Coil motors are widely used in various electronic products. For example, the camera module of a mobile phone includes a coil motor and a lens, and the coil motor is used to realize the automatic focus of the lens. At present, the driving mode of the coil motor is DC drive. DC drive means that under the condition of a certain magnetic field strength, the force generated by the coil motor under the drive of the DC signal is certain. Therefore, a driving circuit that can increase the force generated by the coil motor is needed. Summary of the invention

[0004] In view of this, the present application provides a driving circuit of a coil motor and a camera module to increase the force generated by the coil motor.

[0005] In the first aspect, an embodiment of the present application provides a driving circuit for a coil motor, comprising: a power module and a charge and discharge module, wherein: a first end of the charge and discharge module is connected to a first end of the power module, a second end of the charge and discharge module is connected to a first end of the coil motor, and a third end of the charge and discharge module, a second end of the power module and a second end of the coil motor are connected; the power module is used to provide a first AC signal; the first AC signal comprises an alternately distributed first signal and a second signal, the first signal is used to charge the charge and discharge module in a charging stage, and the second signal is used to output to the coil motor in a discharging stage; the charge and discharge module is used to charge under the action of the first signal in the charging stage, and output a third signal to the coil motor in the discharging stage; the second signal and the third signal are used to jointly drive the coil motor; wherein the second signal has the same direction as the third signal.

[0006] Obviously, in the charging stage, the power module charges the charge-discharge module through the first signal, and in the discharging stage, the power module outputs the second signal, and the charge-discharge module outputs the third signal, so that the coil motor is driven by the second signal and the third signal, and the second signal and the third signal have the same direction. Therefore, compared with DC drive, the intensity of the signal driving the coil motor is increased, thereby increasing the current on the coil of the coil motor, thereby increasing the force generated by the coil motor.

[0007] In a possible implementation, the charge and discharge module may include a first charge and discharge unit and a first switch unit, wherein: a first end of the first charge and discharge unit is connected to a first end of the power module, a second end of the first charge and discharge unit and a first end of the first switch unit are connected to a first end of the coil motor, and a second end of the first switch unit is connected to a second end of the power module and a second end of the coil motor; the first switch unit is used to be turned on during the charging stage to charge the first charge and discharge unit through the first signal provided by the power module, and to be turned off during the discharging stage to output the second signal to the coil motor through the power module, and to output the third signal to the coil motor through the first charge and discharge unit; wherein the first signal is in opposite directions to the second signal.

[0008] Obviously, since the first switch unit is connected to both ends of the coil motor, and the first switch unit is turned on in the charging stage to charge the first charge-discharge unit through the first signal provided by the power module, and is turned off in the discharging stage to output the second signal to the coil motor through the power module, and output the third signal to the coil motor through the first charge-discharge unit through discharge. In addition, the first signal is opposite to the second signal. Therefore, the third signal has the same direction as the second signal, that is, it can be understood that after the third signal is connected in series with the second signal, they jointly drive the coil motor, increase the strength of the signal driving the coil motor, thereby increasing the current on the coil of the coil motor, and then increasing the force generated by the coil motor.

[0009] In a possible implementation, the charge and discharge module includes a second charge and discharge unit, a third charge and discharge unit, an isolation unit, a second switch unit, a third switch unit and a fourth switch unit, wherein: a first end of the second charge and discharge unit is connected to a second end of the power module and a second end of the coil motor, a second end of the second charge and discharge unit, a second end of the second switch unit, a first end of the third switch unit and a first end of the isolation unit are connected, a second end of the isolation unit and a second end of the fourth switch unit are connected to a first end of the electromagnetic motor, a first end of the second switch unit and a first end of the third charge and discharge unit are connected to a first end of the power module, a second end of the third charge and discharge unit, a second end of the third switch unit and a first end of the fourth switch unit are connected; the charging stage includes a first charging stage and a second charging stage, and the first signal includes a fourth signal and a fifth signal ; In the first charging stage, the second switch unit is turned on, and the third switch unit and the fourth switch unit are turned off, so as to charge the second charge and discharge unit through the fourth signal provided by the power module; in the second charging stage, the second switch unit and the fourth switch unit are turned off, and the third switch unit is turned on, so as to charge the third charge and discharge unit through the fifth signal provided by the power module and the sixth signal provided by the second charge and discharge unit; in the discharging stage, the second switch unit and the third switch unit are turned off, and the fourth switch unit is turned on, so as to output the second signal to the coil motor through the power module, and output the third signal to the coil motor through the third charge and discharge unit; wherein, the fourth signal is opposite to the fifth signal in direction, the fourth signal is the same as the second signal in direction, and the fifth signal is the same as the sixth signal in direction.

[0010] Obviously, in the first charging stage, the second charge-discharge unit is charged by the fourth signal, and in the second charging stage, the third charge-discharge unit is charged by the fifth signal and the sixth signal provided by the second charge-discharge unit through discharge, and the fifth signal and the sixth signal have the same direction, thus increasing the electric energy stored in the third charge-discharge unit. Based on this, in the discharge stage, the coil motor is driven by the second signal and the third signal provided by the third charge-discharge unit through discharge, further increasing the strength of the signal driving the coil motor, thereby increasing the current on the coil of the coil motor, and further increasing the force generated by the coil motor.

[0011] In a possible implementation, the first switch unit may include: a first diode, whose anode is connected to the first end of the first switch unit; a first switch element, whose first end is connected to the cathode of the first diode, and whose second end is connected to the second end of the first switch unit; a second diode, whose anode is connected to the second end of the first switch unit; a second switch element, whose first end is connected to the cathode of the second diode, and whose second end is connected to the first end of the first switch unit; wherein, when the first signal is at a high level and the second signal is at a low level, the first switch element is turned on and the second switch element is turned off; when the first signal is at a low level and the second signal is at a high level, the first switch element is turned off and the second switch element is turned on.

[0012] In a possible implementation, the first switch unit may include: a third diode, whose anode is connected to the first end of the first switch unit; a fourth diode, whose cathode is connected to the first end of the first switch unit; a first controller, whose first end is connected to the cathode of the third diode, whose second end is connected to the anode of the fourth diode, and whose third end is connected to the second end of the first switch unit, and which is used to control the cathode of the third diode to be conducted with the second end of the first switch unit or the anode of the fourth diode to be conducted with the second end of the first switch unit according to the first AC signal.

[0013] In a possible implementation, the fifth switch unit is any one of the second switch unit, the third switch unit and the fourth switch unit; the fifth switch unit may include: a fifth diode, whose anode is connected to the first end of the fifth switch unit; a third switch element, whose first end is connected to the cathode of the fifth diode, and whose second end is connected to the second end of the fifth switch unit; a sixth diode, whose anode is connected to the second end of the fifth switch unit; a fourth switch element, whose first end is connected to the cathode of the sixth diode, and whose second end is connected to the first end of the fifth switch unit; wherein, when the fourth signal and the second signal are high level and the fifth signal is low level, the third switch element is turned on and the fourth switch element is turned off; when the fourth signal and the second signal are low level and the fifth signal is high level, the third switch element is turned off and the fourth switch element is turned on.

[0014] In a possible implementation, the fifth switch unit is any one of the second switch unit, the third switch unit and the fourth switch unit; the fifth switch unit includes: a seventh diode, whose positive electrode is connected to the first end of the fifth switch unit; an eighth diode, whose negative electrode is connected to the first end of the fifth switch unit; a second controller, whose first end is connected to the negative electrode of the seventh diode, the second end is connected to the positive electrode of the eighth diode, and the third end is connected to the second end of the fifth switch unit, and is used to control the negative electrode of the seventh diode to be connected to the second end of the fifth switch unit or the positive electrode of the eighth diode to be connected to the second end of the fifth switch unit according to the first AC signal.

[0015] In a possible implementation, the first charge and discharge unit includes: a first capacitor connected between a first end and a second end of the first charge and discharge unit; a capacitance of the first capacitor is greater than a resonant capacitance of the coil of the coil motor.

[0016] Obviously, since the capacitance of the first capacitor is greater than the resonant capacitance of the coil of the coil motor, during the discharge phase, the first capacitor resonates with the coil of the coil motor, thereby minimizing the impedance of the drive circuit and maximizing the current in the coil of the coil motor.

[0017] In a possible implementation, the second charge and discharge unit includes a second capacitor, which is connected between the first end and the second end of the second charge and discharge unit; the third charge and discharge unit includes a third capacitor, which is connected between the first end and the second end of the third charge and discharge unit; the sum of the capacitances of the second capacitor and the third capacitor is greater than the resonant capacitance of the coil of the coil motor.

[0018] Obviously, since the sum of the capacitances of the second capacitor and the third capacitor is greater than the resonant capacitance of the coil of the coil motor, during the discharge phase, the second capacitor and the third capacitor resonate with the coil of the coil motor to minimize the impedance of the drive circuit, thereby maximizing the current in the coil of the coil motor.

[0019] In a possible implementation, the power supply module is specifically configured to provide the first AC signal according to a movement direction of a load driven by the coil motor.

[0020] In one possible implementation, the power supply module also includes a first information table; the first information table includes multiple second AC signals and multiple routes, the multiple second AC signals correspond one-to-one to the multiple routes, and each of the multiple routes includes a first starting position and a first end position of the load driven by the coil motor; the power supply module is specifically used to match the first AC signal among the multiple second AC signals in the first information table according to a target route, and provide the first AC signal; wherein the target route includes the second starting position and the second end position of the load.

[0021] Obviously, since the first information table includes multiple second AC signals and multiple routes, the power module can match the first AC signal among the multiple second AC signals in the first information table according to the target route and provide the first AC signal, thereby realizing flexible control of the load.

[0022] In a second aspect, an embodiment of the present application provides a camera module, comprising at least one coil motor, a lens assembly, and at least one driving circuit described in any one of the first aspects, wherein: the at least one driving circuit corresponds one-to-one to the at least one coil motor; and the at least one coil motor is used to drive the lens assembly to move under the drive of the at least one driving circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A schematic diagram of a drive circuit of a coil motor provided in an embodiment of the present application;

[0024] Figure 2 A schematic diagram of another coil motor driving circuit provided in an embodiment of the present application;

[0025] Figure 3 Schematic diagram of the first AC signal provided in the embodiment of the present application Figure 1 ;

[0026] Figure 4 Schematic diagram of the first AC signal provided in the embodiment of the present application Figure 2 ;

[0027] Figure 5 Schematic diagram of the first AC signal provided in the embodiment of the present application Figure 3 ;

[0028] Figure 6 Schematic diagram of the first AC signal provided in the embodiment of the present application Figure 4 ;

[0029] Figure 7 Schematic diagram of the first AC signal provided in the embodiment of the present application Figure 5 ;

[0030] Figure 8 A schematic diagram of the structure of a first switch unit provided in an embodiment of the present application;

[0031] Fig. 9 (a) is a schematic diagram of a first AC signal provided in an embodiment of the present application;

[0032] Fig. 9 (b) is a schematic diagram of the current on the coil motor provided in the embodiment of the present application Figure 1 ;

[0033] Fig. 9 (c) is a schematic diagram of the current on the coil motor provided in the embodiment of the present application Figure 2 ;

[0034] Fig.10 An operating state diagram of the driving circuit provided in an embodiment of the present application in a charging stage;

[0035] Fig.11 The driving circuit provided in the embodiment of the present application is in the operating state of the discharge stage Figure 1 ;

[0036] Fig.12 An equivalent circuit diagram of a driving circuit provided in an embodiment of the present application in a discharge stage;

[0037] Fig.13 A schematic diagram of a driving circuit of another coil motor provided in an embodiment of the present application;

[0038] Fig.14 Schematic diagram of the first AC signal provided in the embodiment of the present application Figure 6 ;

[0039] Fig.15 A schematic diagram of the structure of a fifth switch unit provided in an embodiment of the present application;

[0040] Fig.16 Another structural schematic diagram of the fifth switch unit provided in the embodiment of the present application;

[0041] Fig.17 (a) is a schematic diagram of another first AC signal provided in an embodiment of the present application;

[0042] Fig.17 (b) is a schematic diagram of the current on the coil motor provided in the embodiment of the present application Figure 3 ;

[0043] Fig.17 (c) is a schematic diagram of the current on the coil motor provided in the embodiment of the present application Figure 4 ;

[0044] Fig.18An operating state diagram of the driving circuit provided in an embodiment of the present application in the first charging stage;

[0045] Fig.19 A diagram showing the operating state of the driving circuit provided in an embodiment of the present application in the second charging stage;

[0046] Fig. 20 The driving circuit provided in the embodiment of the present application is in the operating state of the discharge stage Figure 2 ;

[0047] Fig.21 A schematic diagram of the structure of the camera module provided in an embodiment of the present application. DETAILED DESCRIPTION

[0048] The technical solutions in the embodiments of the present application will be described below in conjunction with the accompanying drawings.

[0049] In the embodiments of the present application, unless otherwise specified, "plurality" may mean two or more than two. In the embodiments of the present application, unless otherwise specified, "first", "second" and "third" are used to distinguish different objects, rather than to limit a specific order.

[0050] As users' demand for high-quality photography increases, more and more camera modules are installed in mobile phones. Usually, the camera module in a mobile phone includes a motor to drive the lens to achieve fast and stable focus. Motors can be divided into coil motors, memory metal motors, and ultrasonic motors. Among them, coil motors have become the most common type of motor due to mature technology. Since the principle of coil motors is similar to that of speakers, coil motors are also called voice coil motors, which have the characteristics of high frequency response and high precision.

[0051] The main principle of the voice coil motor is to provide a DC current to the coil of the voice coil motor in a permanent magnetic field so that the voice coil motor drives the lens to move. In mobile phones, voice coil motors are widely used to achieve automatic focus of the lens, so that the lens position can be adjusted through the voice coil motor to present a clear image.

[0052] A voice coil motor is a device that can convert electric current into mechanical force. The physical principle of the voice coil motor (VCM) is that when a current-carrying conductor passes through a magnetic field, a force perpendicular to the magnetic field lines is generated. The magnitude of this force depends on the length of the current-carrying conductor passing through the magnetic field, the magnetic field strength, and the magnitude of the current on the current-carrying conductor. The force generated by the voice coil motor mainly depends on the structure of the voice coil motor and the magnitude of the current in the coil of the voice coil motor. The relationship between the current and the generated force is reflected as force sensitivity kf in a linear voice coil motor and as torque sensitivity kt in a rotary voice coil motor.

[0053] In the related art, the coil motor is driven by direct current (DC) drive. DC drive means that when the magnetic field strength is constant, the force generated by the coil motor under the drive of the DC signal is constant. Therefore, a driving circuit that can increase the force generated by the coil motor is needed.

[0054] In order to solve the above technical problems, Figure 1 As shown, the embodiment of the present application provides a drive circuit for a coil motor. The drive circuit may include a power module 100 and a charge and discharge module 200. Among them:

[0055] The first end 21 of the charge and discharge module 200 is connected to the first end 11 of the power module 100. The second end 22 of the charge and discharge module 200 is connected to the first end 31 of the coil motor 300. The third end 23 of the charge and discharge module 200, the second end 12 of the power module 100 and the second end 32 of the coil motor 300 are connected.

[0056] The power module 100 can be used to provide a first AC signal. The first AC signal may include an alternately distributed first signal and a second signal, the first signal can be used to charge the charge and discharge module 200 in the charging stage, and the second signal can be used to output to the coil motor 300 in the discharging stage. The charge and discharge module 200 can be used to charge under the action of the first signal in the charging stage, and output a third signal to the coil motor 300 in the discharging stage. The second signal and the third signal can be used to drive the coil motor 300 together. The second signal and the third signal have the same direction.

[0057] In the embodiment of the present application, the power module 100 may be a voltage source, that is, the first AC signal may be a voltage signal. The power module 100 may also be a current source, that is, the first AC signal may also be a current signal, which is not particularly limited in the embodiment of the present application. The coil motor 300 may, for example, include at least a magnet and a coil. The charge and discharge module 200 will be described in detail below and will not be described here.

[0058] As can be seen from the above, the specific working process of the driving circuit can be, for example:

[0059] In the charging stage, the charge-discharge module 200 short-circuits the coil motor 300 and forms a charging loop with the power module 100. The power module 100 provides a first signal, and the charge-discharge module 200 performs charging under the action of the first signal.

[0060] In the discharge phase, the charge-discharge module 200 forms a series loop with the power module 100 and the coil motor 300. The power module 100 provides a second signal, and the charge-discharge module 200 provides a third signal by discharging, so as to drive the coil motor 300 together with the second signal and the third signal.

[0061] The same direction of the second signal and the third signal may mean that the positive output terminal of the power module 100 is connected to the negative output terminal of the charge and discharge module 200 in the discharge stage, or the negative output terminal of the power module 100 is connected to the positive output terminal of the charge and discharge module 200 in the discharge stage.

[0062] Obviously, in the charging stage, the power module 100 charges the charge-discharge module 200 through the first signal. In the discharging stage, the power module 100 outputs the second signal, and the charge-discharge module 200 outputs the third signal, so as to drive the coil motor 300 together through the second signal and the third signal, and the second signal and the third signal have the same direction. Therefore, compared with the DC drive, the strength of the signal driving the coil motor 300 is increased, thereby increasing the current on the coil of the coil motor 300, thereby increasing the force generated by the coil motor 300.

[0063] The structure and working principle of the charge and discharge module 200 are described in detail below. The structure of the charge and discharge module 200 includes but is not limited to the following two types, wherein:

[0064] The first one, such as Figure 2 As shown, the charge and discharge module 200 may include a first charge and discharge unit 211 and a first switch unit 212 .

[0065] The first end of the first charge and discharge unit 211 is connected to the first end 11 of the power module 100, the second end of the first charge and discharge unit 211 and the first end of the first switch unit 212 are connected to the first end 31 of the coil motor 300, and the second end of the first switch unit 212 is connected to the second end 12 of the power module 100 and the second end 32 of the coil motor 300.

[0066] The first switch unit 212 is used to be turned on in the charging stage to charge the first charge-discharge unit 211 through the first signal provided by the power module 100, and turned off in the discharging stage to output the second signal to the coil motor 300 through the power module 100, and output the third signal to the coil motor 300 through the first charge-discharge unit 211. The first signal is opposite to the second signal in direction.

[0067] In the embodiment of the present application, the first AC signal may be a periodic signal, and one period of the first AC signal may include the first signal and the second signal. That is, it can be understood that the first AC signal may include the first signal and the second signal that are alternately distributed.

[0068] The first signal is opposite to the second signal in direction. For example, if the first signal is at a high level, the second signal is at a low level. Alternatively, if the first signal is at a low level, the second signal is at a high level.

[0069] It should be noted that, when the first signal is at a high level and the second signal is at a low level, in the charging stage, the first end 11 of the power module 100 is a positive output end, and the second end 12 of the power module is a negative output end. In the discharging stage, the first end 11 of the power module 100 is a negative output end, and the second end 12 of the power module is a positive output end.

[0070] When the first signal is at a low level and the second signal is at a high level, in the charging stage, the first terminal 11 of the power module 100 is a negative output terminal, and the second terminal 12 of the power module 100 is a positive output terminal. In the discharging stage, the first terminal 11 of the power module 100 is a positive output terminal, and the second terminal 12 of the power module is a negative output terminal.

[0071] It should be noted that the high-low relationship between the first signal and the second signal can be determined according to the movement direction of the load driven by the coil motor 300 and the structure of the driving circuit. The load may be, for example, a lens assembly, etc., which is not specifically limited in the embodiments of the present application. The movement direction of the load may include a first direction and a second direction, wherein the first direction is opposite to the second direction. For example, the first direction may be forward and the second direction may be backward. Or the first direction may be upward and the second direction may be downward, etc., which is not specifically limited in the embodiments of the present application.

[0072] The maximum absolute value of the first signal and the maximum absolute value of the second signal may be the same or different, and this is not particularly limited in the embodiment of the present application.

[0073] The sum of the duration of the first signal (i.e., the duration of the charging phase) and the duration of the second signal (i.e., the duration of the discharging phase) is the duration of one cycle of the first AC signal. The ratio of the duration of the first signal to the duration of one cycle of the first AC signal is the duty cycle of the first AC signal. It should be noted that the duty cycle can be set according to the driving requirements, and the embodiments of the present application do not specifically limit this.

[0074] The waveform of the first AC signal can be, for example, a square wave ( Figure 3 , Figure 4 , Figure 5 ), square wave with rising and falling edges ( Figure 6 ), sine wave( Figure 7 ), the superposition of a sine wave and a square wave, or the combination of the above waveforms with a DC component, etc., the embodiments of the present application do not make special limitations on this.

[0075] It should be noted that in Figure 3 to Figure 7 In , t1 is the duration of the first signal, t2 is the duration of the second signal. T is the duration of one cycle of the first AC signal. Figure 3 , Figure 5 to Figure 7In , the first signal is at a low level and the second signal is at a high level. Figure 4 In , the first signal is high level and the second signal is low level. Figure 3 , Figure 4 , Figure 6 and Figure 7 In the embodiment, the duration t1 of the first signal is the same as the duration t2 of the second signal. Figure 5 In the embodiment, the duration t1 of the first signal and the duration t2 of the second signal are different. Figure 3 , Figure 4 , Figure 6 and Figure 7 In , the maximum absolute value of the first signal is the same as the maximum absolute value of the second signal (i.e., both are u). Figure 5 , the maximum absolute value u2 of the first signal -u2 is different from the maximum absolute value u1 of the second signal u1.

[0076] In the embodiments of the present application, Figure 2 From the structure and related description of the charge and discharge module 200, it can be seen that:

[0077] In the charging stage, the first switch unit 212 is turned on, the coil motor 300 is short-circuited by the turned-on first switch unit 212, and the power module 100, the first charge and discharge unit 211 and the turned-on first switch unit 212 form a charging loop. The power module 100 outputs a first signal, and the first charge and discharge unit 211 is charged under the action of the first signal.

[0078] In the discharge stage, the first switch unit 212 is turned off, and the power module 100, the first charge and discharge unit 211 and the coil motor 300 form a series circuit. The power module 100 outputs the second signal, and the first charge and discharge unit 211 provides the third signal by discharging, so as to drive the coil motor 300 together with the second signal and the third signal.

[0079] Obviously, since the first switch unit 212 is connected to both ends of the coil motor 300, and the first switch unit 212 is turned on in the charging stage to charge the first charge and discharge unit 211 through the first signal provided by the power module 100, and is turned off in the discharging stage to output the second signal to the coil motor 300 through the power module 100, and output the third signal to the coil motor 300 through the first charge and discharge unit 211. In addition, the first signal is opposite to the second signal. Therefore, the third signal has the same direction as the second signal, that is, it can be understood that after the third signal is connected in series with the second signal, the coil motor 300 is driven together, the strength of the signal driving the coil motor 300 is increased, thereby increasing the current on the coil of the coil motor 300, and then increasing the force generated by the coil motor 300.

[0080] Next, the first charging and discharging unit 211 and the first switching unit 212 are described in detail.

[0081] The structure of the first charge and discharge unit 211 can be described as follows:

[0082] The first charge and discharge unit 211 may include a first capacitor C1 (eg Figure 2 As shown), the first capacitor C1 is connected between the first end and the second end of the first charge and discharge unit 211.

[0083] In one possible implementation, in order to minimize the impedance of the driving circuit during the discharge phase and maximize the current on the coil of the coil motor 300, when selecting the specifications of the first capacitor C1, the capacitance of the first capacitor C1 needs to be greater than the resonant capacitance of the coil of the coil motor 300.

[0084] Obviously, since the capacitance of the first capacitor C1 is greater than the resonant capacitance of the coil of the coil motor 300, during the discharge phase, the first capacitor C1 resonates with the coil of the coil motor 300, thereby minimizing the impedance of the drive circuit and maximizing the current on the coil of the coil motor 300.

[0085] It should be noted that, in other embodiments of the present application, the first charge-discharge unit 211 may also include a plurality of first capacitors connected in parallel. Similarly, in order to minimize the impedance of the drive circuit during the discharge phase and maximize the current on the coil of the coil motor 300, when selecting the specifications of the plurality of first capacitors, the parallel capacitance of the plurality of first capacitors must be greater than the resonant capacitance of the coil of the coil motor 300.

[0086] The structure of the first switch unit 212 may include at least the following two types, wherein:

[0087] The first one, such as Figure 2 As shown, the first switch unit 212 may include: a first diode D1, a first switch element K1, a second diode D2 and a second switch element K2. Wherein:

[0088] The anode of the first diode D1 is connected to the first end of the first switch unit 212. The first end of the first switch element K1 is connected to the cathode of the first diode D1, and the second end of the first switch element K1 is connected to the second end of the first switch unit 212. The anode of the second diode D2 is connected to the second end of the first switch unit 212. The first end of the second switch element K2 is connected to the cathode of the second diode D2, and the second end of the second switch element K2 is connected to the first end of the first switch unit 212.

[0089] In the embodiment of the present application, when the first signal is at a high level and the second signal is at a low level, the first switch element K1 is turned on and the second switch element K2 is turned off. In this way, in the charging stage, since the first switch element K1 is turned on, the power module 100 outputs the first signal and the first signal is at a high level, therefore, the first diode D1 is turned on under the action of the first signal, and the first signal can charge the first charge-discharge unit 211 through the turned-on first switch element K1 and the first diode D1 (i.e., the turned-on first switch unit 212). In the discharging stage, although the first switch element K1 is turned on, since the power module 100 outputs the second signal and the second signal is at a low level, therefore, the first diode D1 is turned off (i.e., the first switch unit 212 is turned off), the power module 100 provides the second signal to the coil motor 300, and the first charge-discharge unit 211 can provide the third signal to the coil motor 300 through discharge, so as to drive the coil motor 300 together through the second signal and the third signal.

[0090] When the first signal is at a low level and the second signal is at a high level, the first switch element K1 is turned off and the second switch element K2 is turned on. In this way, in the charging stage, since the second switch element K2 is turned on, the power module 100 outputs the first signal and the first signal is at a low level, therefore, the second diode D2 is turned on under the action of the first signal, and the first signal can charge the first charge-discharge unit 211 through the turned-on second switch element K2 and the second diode D2 (i.e., the turned-on first switch unit 212). In the discharging stage, although the second switch element K2 is turned on, since the power module 100 outputs the second signal and the second signal is at a high level, therefore, the second diode D2 is turned off (i.e., the first switch unit 212 is turned off), the power module 100 provides the second signal to the coil motor 300, and the first charge-discharge unit 211 provides the third signal to the coil motor 300 through discharge, so as to drive the coil motor 300 together through the second signal and the third signal.

[0091] The opening or closing of the first switch element K1 and the second switch element K2 can be controlled by a control unit. The first switch element K1 and the second switch element K2 can be, for example, a triode or a MOSFET (metal-oxide semiconductor field effect transistor), etc., which is not particularly limited in the embodiment of the present application. In the case where the first switch element K1 and the second switch element K2 are triodes or MOSFETs, the control end of the triode or MOSFET can be controlled by the control unit to realize the conduction and closing of the triode or MOSFET.

[0092] The second type, such as Figure 8 As shown, the first switch unit 212 may include: a third diode D3, a fourth diode D4 and a first controller, wherein:

[0093] The anode of the third diode D3 is connected to the first end of the first switch unit 212, the cathode of the fourth diode D4 is connected to the first end of the first switch unit 212, the first end of the first controller is connected to the cathode of the third diode D3, the second end of the first controller is connected to the anode of the fourth diode D4, and the third end of the first controller is connected to the second end of the first switch unit 212.

[0094] The first controller can be used to control the cathode of the third diode D3 to be connected to the second end of the first switch unit 212 or the anode of the fourth diode D4 to be connected to the second end of the first switch unit 212 according to the first AC signal.

[0095] Exemplarily, when the first signal is at a high level and the second signal is at a low level, the first controller controls the cathode of the third diode D3 to be turned on with the second end of the first switch unit 212. In this way, in the charging stage, since the first controller controls the cathode of the third diode D3 to be turned on with the second end of the first switch unit 212, the power module 100 outputs the first signal and the first signal is at a high level, therefore, the third diode D3 is turned on under the action of the first signal, and the first signal can charge the first charge and discharge unit 211 through the cathode of the turned-on third diode D3 and the second end of the first switch unit 212 and the third diode D3 (i.e., the turned-on first switch unit 212). During the discharge stage, although the first controller controls the cathode of the third diode D3 and the second end of the first switch unit 212 to be turned on, since the power module 100 outputs the second signal and the second signal is at a low level, the third diode D3 is turned off (that is, the first switch unit 212 is turned off), and the power module 100 provides the second signal to the coil motor 300. The first charge and discharge unit 211 provides the third signal to the coil motor 300 through discharge, so as to drive the coil motor 300 together through the second signal and the third signal.

[0096] When the first signal is at a low level and the second signal is at a high level, the first controller controls the anode of the fourth diode D4 to be connected to the second end of the first switch unit 212. In this way, in the charging stage, since the anode of the fourth diode D4 is connected to the second end of the first switch unit 212, the power module 100 outputs the first signal and the first signal is at a low level. Therefore, the fourth diode D4 is turned on under the action of the first signal, and the first signal can charge the first charge and discharge unit 211 through the anode of the turned-on fourth diode D4 and the second end of the first switch unit 212 and the fourth diode D4 (that is, the turned-on first switch unit 212). During the discharge stage, although the first controller controls the positive electrode of the fourth diode D4 and the second end of the first switch unit 212 to be turned on, since the power module 100 outputs the second signal and the second signal is at a high level, the fourth diode D4 is turned off (that is, the first switch unit 212 is turned off), and the power module 100 provides the second signal to the coil motor 300, and the first charge and discharge unit 211 provides the third signal to the coil motor 300 through discharge, so as to drive the coil motor 300 together through the second signal and the third signal.

[0097] It should be noted that the above description of the first switch unit 212 is only exemplary and is not intended to limit the first switch unit 212 provided in the embodiment of the present application. For example, in other embodiments, the first switch unit 212 may also be a MOSFET, the source and drain of which are connected between the first end and the second end of the first switch unit 212, and the gate of the MOSFET may be controlled by a control unit to turn the MOSFET on and off.

[0098] It should be noted that a diode is used in the first switch unit 212 of the above two structures, because the diode has unidirectional conductivity. That is, under a positive bias, the diode is turned on, and the resistance of the diode in the on state is very small, about tens to hundreds of ohms. Under a negative bias, the diode is turned off (that is, the diode is in a cut-off state), and the resistance of the turned-off diode is very large. Using this feature, the diode can play a role in controlling the passage or shutoff of current in the circuit (that is, an electronic switch). In this way, by introducing a diode into the first switch unit 212 of the above two structures, and combining the diode with a switch element or a first controller, the first switch unit 212 can be turned on and off.

[0099] In the selection of diodes, the main focus is on the diode's on-state voltage, on-state impedance, reverse breakdown voltage, withstand voltage, etc. When the first AC signal is input to the diode, a spike current will flow through the diode when the first AC signal changes from positive to negative. Therefore, in order to ensure that the diode is not damaged by the spike current, the withstand voltage of the diode must be greater than the product of the spike current and the on-state resistance.

[0100] Below, Fig. 9 For example, Figure 2 The working principle of the driving circuit in is explained. Figure 2 In the embodiment, the first charging and discharging unit 211 is a first capacitor C1, and the first switching unit 212 includes a first diode D1, a first switching element K1, a second diode D2 and a second switching element K2. The specific connection method has been described above and will not be repeated here. Fig. 9 (a) shows a first AC signal, which is a voltage signal, the first signal is -u (i.e., low level), and the second signal is u (i.e., high level). The duration of the first signal -u (i.e., charging stage) is t1, the duration of the second signal u (i.e., discharging stage) is t2, and the duration of one cycle of the first AC signal is T. As can be seen from the above, since the first signal is low level and the second signal is high level, the second switch element K2 is turned on and the first switch element K1 is turned off. Fig. 9 (b) is a schematic diagram of the current on the coil motor provided in the embodiment of the present application Figure 1 . Fig. 9 (c) is a schematic diagram of the current on the coil motor provided in the embodiment of the present application Figure 2 .

[0101] like Fig. 9 As shown in (a), in the charging stage t1, the power module 100 outputs the first signal -u, that is, the first terminal 11 of the power module 100 is a negative output terminal (that is, the output voltage is 0), and the second terminal 12 of the power module 100 is a positive output terminal (that is, the output voltage is u). Fig.10 As shown, since the second switch element K2 is turned on, the first signal is transmitted to the second diode D2 through the turned-on second switch element K2. The second diode D2 is turned on under the action of the first signal, and the coil motor 300 is short-circuited by the turned-on second diode D2 and the second switch element K2, that is, the power module 100, the turned-on second diode D2, the second switch element K2 and the first capacitor C1 form a charging loop, and the first signal charges the first capacitor C1 through the turned-on second diode D2 and the second switch element K2.

[0102] It should be noted that Fig.10 The arrow in the figure indicates the charging direction. After the first capacitor C1 is charged, the positive and negative electrodes of the first capacitor C1 are as shown in FIG. Fig.10 In addition, since the first capacitor C1 is charged by the voltage u, after the charging is completed, the voltage of the first capacitor C1 may be u.

[0103] like Fig. 9As shown in (a), in the discharge stage t2, the power module 100 outputs the second signal u, that is, the first terminal 11 of the power module 100 is a positive output terminal (that is, the output voltage is u), and the second terminal 12 of the power module 100 is a negative output terminal (that is, the output voltage is 0). Fig.11 As shown, although the second switching element K2 is turned on, since the second signal u is at a high level, the second diode D2 is turned off, that is, the power module 100, the first capacitor C1 and the coil motor 300 form a series circuit, and the power module 100 outputs the second signal to the coil motor 300. The first capacitor C1 outputs the third signal to the coil motor 300 by discharging, so as to drive the coil motor 300 together with the third signal and the second signal (i.e., 2u), thereby increasing the strength of the signal driving the coil motor 300, thereby increasing the current on the coil of the coil motor 300, and further increasing the force generated by the coil motor 300.

[0104] It should be noted that Fig.11 The arrow in FIG. 1 indicates the current flow direction in the discharge phase t2. In the discharge phase t2, the positive and negative electrodes of the first capacitor C1 and the positive and negative electrodes of the power module 100 are as shown in FIG. Fig.11 Obviously, Fig.11 It can be seen that the positive electrode of the power module 100 is connected to the negative electrode of the first capacitor C1, that is, the second signal and the third signal have the same direction.

[0105] Since the power module 100 charges the first capacitor C1 through the output first signal in the charging stage t1, the coil motor 300 is short-circuited. Therefore, in the charging stage t1, Fig. 9 (b) and Fig. 9 As shown in (c), no current flows through the coil motor 300.

[0106] In the discharge stage t2, since the second signal and the third signal jointly drive the coil motor 300, current flows through the coil motor 300. Since the current in the coil of the coil motor 300 cannot change suddenly, when the second signal and the third signal simultaneously supply power to the coil motor 300, the current in the coil motor 300 gradually increases. When the current reaches the highest point, the electric energy stored in the first capacitor C1 is completely released. At this time, if the discharge time of the first capacitor C1 is equal to the discharge stage t2, then Fig. 9 As shown in (b), in the next charging stage t1, the first capacitor C1 is charged by the first signal. Since the current on the coil of the coil motor 300 cannot change suddenly, the current on the coil motor 300 continues to decrease. If the discharge time of the first capacitor C1 is less than the discharge stage t2, then Fig. 9As shown in (c), after the current reaches the highest point, the power module 100 continues to supply power to the coil motor 300 through the second signal, and the current on the coil motor 300 continues to be maintained until the next charging stage t1 arrives. In the next charging stage t1, while the first capacitor C1 is charged by the first signal, the current on the coil of the coil motor 300 cannot change suddenly, so the current on the coil motor 300 continues to decrease.

[0107] Fig.12 Shows the discharge phase Figure 2 The equivalent circuit diagram of the driving circuit is shown in FIG. Fig.12 In the figure, the coil motor 300 can be equivalent to a resistor R1 and an inductor L1. The formula for calculating the force generated by the coil motor 300 can be: F = BIL, where B is the strength of the magnetic field at the location of the coil motor 300, I is the current on the coil of the coil motor 300, and L is the effective length of cutting the magnetic flux lines.

[0108] I=u(t) / Z, where u(t) is the voltage output by the power module 100, and Z is the impedance of the drive circuit in the discharge stage. Z=r+jwL+1 / jwC+Rac, where jwL is the impedance of the inductor L1, 1 / jwC is the impedance of the first capacitor C1, Rac is the eddy impedance of the coil of the coil motor 300, and r is the DC impedance of the coil and loop of the coil motor 300.

[0109] It should be noted that in actual design, Z needs to be controlled at a smaller value as much as possible to increase the current in the drive circuit. Specifically, by selecting the first capacitor C1 and the coil motor 300 of appropriate specifications, the capacitance of the first capacitor C1 can be greater than the resonant capacitance of the coil of the coil motor 300, so that the first capacitor C1 and the coil of the coil motor 300 form a resonance, so that jwL+1 / jwC is close to zero, so as to reduce Z. In addition, during the design process, Rac and r can be kept as small as possible to further reduce Z.

[0110] It should be noted that in Figure 2 Based on the driving circuit shown in FIG. 1 , when the first signal is at a high level and the second signal is at a low level, the first switch element K1 is turned on and the second switch element K2 is turned off. The difference between the charging stage and the discharging stage is that in the charging stage, the circuit where the first diode D1 is located is turned on. The charging direction and the discharging direction are the same as Fig.10 and Fig.11 The charging direction is opposite to the discharging direction.

[0111] The second type, such as Fig.13As shown, the charge and discharge module 200 may include a second charge and discharge unit 221, a third charge and discharge unit 231, an isolation unit 241, a second switch unit 222, a third switch unit 232 and a fourth switch unit 242, wherein:

[0112] The first end of the second charge and discharge unit 221 is connected to the second end 12 of the power module 100 and the second end 32 of the coil motor 300, the second end of the second charge and discharge unit 221, the second end of the second switch unit 222, the first end of the third switch unit 232 and the first end of the isolation unit 241 are connected, the second end of the isolation unit 242 and the second end of the fourth switch unit 242 are connected to the first end 31 of the electromagnetic motor 300, the first end of the second switch unit 222 and the first end of the third charge and discharge unit 231 are connected to the first end 11 of the power module 100, and the second end of the third charge and discharge unit 231, the second end of the third switch unit 232 and the first end of the fourth switch unit 242 are connected.

[0113] In the embodiment of the present application, the charging stage may include a first charging stage and a second charging stage, and the first signal may include a fourth signal and a fifth signal. That is, it can be understood that: the first AC signal may be a periodic signal, and one cycle of the first AC signal may include a fourth signal, a fifth signal, and a second signal. Among them, the fourth signal and the fifth signal may constitute the first signal.

[0114] The fourth signal is opposite to the fifth signal in direction, and the fourth signal is the same as the second signal in direction. Exemplarily, if the fourth signal and the second signal are high level, the fifth signal is low level. Alternatively, if the fourth signal and the second signal are low level, the fifth signal is high level.

[0115] It should be noted that the relationship between the high and low levels of the fourth signal, the fifth signal and the second signal and the positive and negative outputs of the two ends of the power module 100 can be found above and will not be repeated here.

[0116] In addition, the high and low relationship between the fourth signal, the fifth signal and the second signal can be determined according to the movement direction of the load driven by the coil motor 300 and the structure of the driving circuit. The load and the movement direction have been described above, so they will not be repeated here.

[0117] The maximum absolute values ​​of the fourth signal, the fifth signal, and the second signal may be the same or different, and this is not particularly limited in the embodiment of the present application.

[0118] The sum of the duration of the fourth signal (i.e., the duration of the first charging stage), the duration of the fifth signal (i.e., the duration of the second charging stage), and the duration of the second signal (i.e., the duration of the discharge stage) is the duration of one cycle of the first AC signal. The ratio of the duration of any one of the fourth signal, the fifth signal, and the second signal to the duration of one cycle of the first AC signal can be set according to the requirements of the driving circuit, and the embodiment of the present application does not specifically limit this.

[0119] The waveform of one cycle of the first AC signal may be, for example, a square wave (eg Fig.14 As shown), a square wave with rising and falling edges, a sine wave, a superposition of a sine wave and a square wave, or a combination of any of the above waveforms with a DC component, etc., the embodiments of the present application do not make special limitations on this.

[0120] It should be noted that in Fig.14 In the figure, T is the duration of one cycle of the first AC signal, t1 is the duration of the fourth signal, t2 is the duration of the fifth signal, t3 is the duration of the second signal, and t1+t2 is the duration of the first signal. The fourth signal and the second signal are both at a low level, and the fifth signal is at a high level. The durations of the fourth signal, the fifth signal and the second signal are the same. The maximum absolute value u of the fourth signal -u and the maximum absolute value u of the fifth signal u are the same as the maximum absolute value u of the second signal -u.

[0121] In an embodiment of the present application, in a first charging stage, the power module 100 provides a fourth signal, the second switch unit 222 is turned on, the third switch unit 232 and the fourth switch unit 242 are turned off, and the power module 100, the second charge and discharge unit 221 and the turned-on second switch unit 222 form a charging circuit to charge the second charge and discharge unit 221 through the fourth signal provided by the power module 100.

[0122] In the second charging stage, the power module 100 provides a fifth signal, the second charge and discharge unit 221 provides a sixth signal by discharging, the second switch unit 222 and the fourth switch unit 242 are turned off, the third switch unit 232 is turned on, and the power module 100, the third charge and discharge unit 231, the three turned-on switch units 232 and the second charge and discharge unit 221 form a charging circuit to charge the third charge and discharge unit 231 through the fifth signal provided by the power module 100 and the sixth signal provided by the second charge and discharge unit 221. Among them, the fifth signal and the sixth signal have the same direction. It should be noted that the description of the same direction of the fifth signal and the sixth signal can be found above, and the embodiment of the present application does not make any special limitation on this.

[0123] During the discharge stage, the power module 100 provides a second signal, the third charge and discharge unit 231 provides a third signal by discharging, the second switch unit 222 and the third switch unit 232 are turned off, and the fourth switch unit 242 is turned on. The power module 100, the third charge and discharge unit 231, the turned-on fourth switch unit 242 and the coil motor 300 form a series circuit to output the second signal to the coil motor 300 through the power module 100, and output the third signal to the coil motor 300 through the third charge and discharge unit 231, and then drive the coil motor 300 together through the second signal and the third signal.

[0124] It should be noted that, in the discharge stage, the isolation unit 241 is used to isolate the second signal and the third signal from the second charge and discharge unit 221 .

[0125] Obviously, in the first charging stage, the second charge-discharge unit 221 is charged by the fourth signal, and in the second charging stage, the third charge-discharge unit 231 is charged by the fifth signal and the sixth signal provided by the second charge-discharge unit 221 through discharge, and the fifth signal and the sixth signal have the same direction, thus increasing the electric energy stored in the third charge-discharge unit 231. Based on this, in the discharge stage, the coil motor is driven by the second signal and the third signal provided by the third charge-discharge unit 231 through discharge, further increasing the strength of the signal driving the coil motor 300, thereby increasing the current on the coil of the coil motor 300, and further increasing the force generated by the coil motor 300.

[0126] Next, the second charge and discharge unit 221 , the third charge and discharge unit 231 , the second switch unit 222 , the third switch unit 232 , the fourth switch unit 242 , and the isolation unit 241 are described.

[0127] The second charge and discharge unit 221 may include a second capacitor C2 (eg Fig.13 The second capacitor C2 is connected between the first end and the second end of the second charge and discharge unit 221. The third charge and discharge unit 231 may include a third capacitor C3 (as shown in FIG. Fig.13 The third capacitor C3 is connected between the first end and the second end of the third charge and discharge unit 231. The isolation unit 241 may include a fourth capacitor C4 (as shown in FIG. Fig.13 As shown), the fourth capacitor C4 is connected between the first end and the second end of the isolation unit 241.

[0128] In one possible implementation, in order to minimize the impedance of the drive circuit during the discharge phase and maximize the current on the coil of the coil motor 300, when selecting the second capacitor C2 and the third capacitor C3, the sum of the capacitances of the second capacitor C2 and the third capacitor C3 must be greater than the resonant capacitance of the coil of the coil motor 300.

[0129] Obviously, since the sum of the capacitances of the second capacitor C2 and the third capacitor C3 is greater than the resonant capacitance of the coil of the coil motor 300, during the discharge phase, the second capacitor C2 and the third capacitor C3 resonate with the coil of the coil motor 300 to minimize the impedance of the drive circuit, thereby maximizing the current on the coil of the coil motor 300.

[0130] It should be noted that, in other embodiments of the present application, the second charge and discharge unit 221 may also include a plurality of second capacitors connected in parallel. The third charge and discharge unit 231 may also include a plurality of third capacitors connected in parallel. The isolation unit 241 may also include a plurality of fourth capacitors connected in parallel. Similarly, in order to minimize the impedance of the drive circuit during the discharge phase and maximize the current on the coil of the coil motor 300, when selecting the specifications of the plurality of second capacitors and the plurality of third capacitors, the sum of the parallel capacitance of the plurality of second capacitors and the parallel capacitance of the plurality of third capacitors must be greater than the resonant capacitance of the coil of the coil motor 300.

[0131] The structures of the second switch unit 222 , the third switch unit 232 and the fourth switch unit 242 are described below by taking the fifth switch unit as an example. The fifth switch unit is any one of the second switch unit 222 , the third switch unit 232 and the fourth switch unit 242 .

[0132] The structure of the fifth switch unit may include at least the following two types, wherein:

[0133] The first one, such as Fig.15 As shown, the fifth switch unit 252 may include: a fifth diode D5, a third switch element K3, a sixth diode D6 and a fourth switch element K4, wherein:

[0134] The anode of the fifth diode D5 is connected to the first end of the fifth switch unit 252. The first end of the third switch element K3 is connected to the cathode of the fifth diode D5, and the second end of the third switch element K3 is connected to the second end of the fifth switch unit 252. The anode of the sixth diode D6 is connected to the second end of the fifth switch unit 252. The first end of the fourth switch element K4 is connected to the cathode of the sixth diode D6, and the second end of the fourth switch element K4 is connected to the first end of the fifth switch unit 252.

[0135] In the embodiment of the present application, when the fourth signal and the second signal are at a high level and the fifth signal is at a low level, the third switch element K3 is turned on and the fourth switch element K4 is turned off. When the fourth signal and the second signal are at a low level and the fifth signal is at a high level, the third switch element K3 is turned off and the fourth switch element K4 is turned on.

[0136] The turning on or off of the third switch element K3 and the fourth switch element K4 can be controlled by a control unit. The third switch element K3 and the fourth switch element K4 can be, for example, a triode or a MOSFET, etc., which is not particularly limited in the embodiment of the present application. In the case where the third switch element K3 and the fourth switch element K4 are triodes or MOSFETs, the control end of the triode or MOSFET can be controlled by the control unit to realize the turning on and off of the triode or MOSFET.

[0137] The second type, Fig.16 As shown, the fifth switch unit 252 may include: a seventh diode D7, an eighth diode D8 and a second controller, wherein:

[0138] The anode of the seventh diode D7 is connected to the first end of the fifth switch unit 252. The cathode of the eighth diode D8 is connected to the first end of the fifth switch unit 252. The first end of the second controller is connected to the cathode of the seventh diode D7, the second end of the second controller is connected to the anode of the eighth diode D8, and the third end of the second controller is connected to the second end of the fifth switch unit 252. The second controller can be used to control the cathode of the seventh diode D7 to be connected to the second end of the fifth switch unit 252 or the anode of the eighth diode D8 to be connected to the second end of the fifth switch unit 252 according to the first AC signal.

[0139] Exemplarily, when the fourth signal and the second signal are at a high level and the fifth signal is at a low level, the second controller controls the cathode of the seventh diode D7 to be connected to the second end of the fifth switch unit 252 .

[0140] When the fourth signal and the second signal are at a low level and the fifth signal is at a high level, the second controller controls the anode of the eighth diode D8 to be conductive with the second end of the fifth switch unit 252 .

[0141] It should be noted that the above description of the fifth switch unit 252 is only exemplary and is not intended to limit the fifth switch unit 252 provided in the embodiment of the present application. For example, in other embodiments, the fifth switch unit 252 may also be a MOSFET, the source and drain of which are connected between the first end and the second end of the fifth switch unit 252, and the gate of the MOSFET may be controlled by a control unit to turn the MOSFET on and off.

[0142] Below, Fig.17 For example, Fig.13 The working principle of the driving circuit in is explained. Fig.13In the embodiment, the second charge and discharge unit 221 is a second capacitor C2, the third charge and discharge unit 231 is a third capacitor C3, the isolation unit 241 is a fourth capacitor C4, and the second switch unit 222, the third switch unit 232 and the fourth switch unit 242 are all adopted. Fig.15 . It should be noted that, for the second switch unit 222, the fifth diode is D52, the third switch element is K32, the sixth diode is D62, and the fourth switch element is K42. For the third switch unit 232, the fifth diode is D53, the third switch element is K33, the sixth diode is D63, and the fourth switch element is K43. For the fourth switch unit 242, the fifth diode is D54, the third switch element is K34, the sixth diode is D64, and the fourth switch element is K44. Fig.17 (a) shows the first AC signal, the first AC signal is a voltage signal, the fourth signal and the second signal are both -u (i.e., low level), and the fifth signal is u (i.e., high level). The duration of the fourth signal -u (i.e., the first charging stage) is t1, the duration of the fifth signal u (i.e., the second charging stage) is t2, the duration of the second signal -u (i.e., the discharge stage) is t3, the duration of one cycle of the first AC signal is T, and t1+t2 is the duration of the first signal. As can be seen from the above, since the fourth signal and the second signal are both low level and the fifth signal is high level, therefore, in each of the above switch units, the fourth switch element is turned on and the third switch element is turned off. Fig.17 (b) is a schematic diagram of the current on the coil motor provided in the embodiment of the present application Figure 3 . Fig.17 (c) is a schematic diagram of the current on the coil motor provided in the embodiment of the present application Figure 4 .

[0143] like Fig.17 As shown in (a), in the first charging stage t1, the power module 100 outputs the fourth signal -u, that is, the first terminal 11 of the power module 100 is a negative output terminal (that is, the output voltage is 0), and the second terminal 12 of the power module 100 is a positive output terminal (that is, the output voltage is u). Fig.18 As shown, since the fourth switch element (i.e., K42, K43, K44) is turned on, the fourth signal is transmitted to the sixth diode D62 through the turned-on fourth switch element K42, and the sixth diode D62 is turned on under the action of the fourth signal. At this time, it can be understood that the second switch unit 222 is turned on, the third switch unit 232 and the fourth switch unit 242 are both turned off, the power module 100, the turned-on fourth switch element K42 and the sixth diode D62, and the second capacitor C2 form a charging loop, and the fourth signal charges the second capacitor C2 through the turned-on fourth switch element K42 and the sixth diode D62.

[0144] It should be noted that Fig.18 The arrow in the figure indicates the charging direction in the first charging stage t1. After the second capacitor C2 is charged, the positive and negative electrodes of the second capacitor C2 are as shown in FIG. Fig.18 In addition, since the second capacitor C2 is charged by the voltage u, after the charging is completed, the voltage of the second capacitor C2 may be u.

[0145] like Fig.17 As shown in (a), in the second charging stage t2, the power module 100 outputs the fifth signal u, that is, the first terminal 11 of the power module 100 is a positive output terminal (that is, the output voltage is u), the second terminal 12 of the power module 100 is a negative output terminal (that is, the output voltage is 0), and the second capacitor C2 provides a sixth signal by discharging, wherein the fifth signal and the sixth signal have the same direction. Fig.19 As shown, since the fourth switch element (i.e., K42, K43, K44) is turned on, the fifth signal u and the sixth signal are transmitted to the sixth diode D63 through the turned-on fourth switch element K43, and the sixth diode D63 is turned on under the action of the fifth signal u and the sixth signal. At this time, it can be understood that the second switch unit 222 and the fourth switch unit 242 are both turned off, the third switch unit 232 is turned on, the second capacitor C2, the power module 100, the third capacitor C3, the turned-on sixth diode D63 and the fourth switch element K43 form a charging loop, and the fifth signal and the sixth signal are used to charge the third capacitor C3 through the turned-on fourth switch element K43 and the sixth diode D63.

[0146] It should be noted that Fig.19 The arrow in the figure indicates the charging direction in the second charging stage. After the third capacitor C3 is charged, the positive and negative electrodes of the third capacitor C3 are as shown in FIG. Fig.19 In addition, since the third capacitor C2 is charged by the voltage u and the sixth signal u provided by the second capacitor C2, the voltage of the third capacitor C3 may be 2u after the charging is completed.

[0147] like Fig.17 As shown in (a), in the discharge stage t3, the power module 100 outputs the second signal -u, that is, the first terminal 11 of the power module 100 is a negative output terminal (that is, the output voltage is 0), the second terminal 12 of the power module 100 is a positive output terminal (that is, the output voltage is u), and the third capacitor C3 provides a third signal by discharging. Fig. 20As shown, since the fourth switch element (i.e., K42, K43, K44) is turned on, the second signal and the third signal are transmitted to the sixth diode D64 through the turned-on fourth switch element K44, and the sixth diode D64 is turned on under the action of the second signal and the third signal. At this time, it can be understood that: the second switch unit 222 and the third switch unit 232 are both turned off, the fourth switch unit 242 is turned on, the power module 100, the third capacitor C3, the turned-on sixth diode D64, the fourth switch element K44 and the coil motor 300 form a series circuit, and the second signal and the third signal drive the coil motor 300 together through the turned-on fourth switch element K44 and the sixth diode D64, thereby increasing the strength of the signal driving the coil motor 300, thereby increasing the current on the coil of the coil motor 300, and then increasing the force generated by the coil motor 300.

[0148] It should be noted that Fig. 20 The arrow in FIG. 1 indicates the current flow direction in the discharge phase t3. In the discharge phase t3, the positive and negative electrodes of the third capacitor C3 and the positive and negative electrodes of the power module 100 are as shown in FIG. Fig. 20 Obviously, Fig. 20 It can be seen that the negative electrode of the power module 100 is connected to the positive electrode of the third capacitor C3, that is, the second signal and the third signal have the same direction.

[0149] Since in the first charging stage t1, the power module 100 charges the second capacitor C2 through the output fourth signal, therefore, in the first charging stage t1, Fig.17 (b) and Fig.17 As shown in (c), no current flows through the coil motor 300.

[0150] Similarly, in the second charging stage t2, the power module 100 charges the third capacitor C3 through the fifth signal outputted and the sixth signal provided by the second charging capacitor C2. Therefore, in the second charging stage t2, Fig.17 (b) and Fig.17 As shown in (c), no current flows through the coil motor 300.

[0151] In the discharge stage t3, since the second signal and the third signal jointly drive the coil motor 300, current flows through the coil motor 300. Since the current in the coil of the coil motor 300 cannot change suddenly, when the second signal and the third signal simultaneously supply power to the coil motor 300, the current in the coil motor 300 gradually increases. When the current reaches the highest point, the electric energy stored in the third capacitor C3 is completely released. At this time, if the discharge time of the third capacitor C3 is equal to the discharge stage t3, then Fig.17As shown in (b), in the next first charging stage t1, the second capacitor C2 is charged by the fourth signal. Since the current on the coil of the coil motor 300 cannot change suddenly, the current on the coil motor 300 continues to decrease. If the discharge time of the third capacitor C3 is less than the discharge stage t3, then Fig.17 As shown in (c), after the current reaches the highest point, the power module 100 continues to supply power to the coil motor 300 through the second signal, and the current on the coil motor 300 continues to be maintained until the next first charging stage t1 arrives. While the second capacitor C2 is charged through the fourth signal in the next first charging stage t1, since the current on the coil of the coil motor 300 cannot change suddenly, the current on the coil motor 300 continues to decrease, and the continuous decrease process covers the next first charging stage t1 and the next second charging stage t2.

[0152] It should be noted that in Fig.13 Based on the driving circuit shown in , when the fourth signal and the second signal are both high level and the fifth signal is low level, the fourth switch element is turned off and the third switch element is turned on. The difference between the first charging stage, the second charging stage and the discharging stage is that in the first charging stage, the line where the fifth diode D52 is located is turned on. In the second charging stage, the line where the fifth diode D53 is located is turned on, and in the discharging stage, the fifth diode D54 is turned on. The charging direction and the discharging direction are the same as Figures 18 to 20 The charging direction is opposite to the discharging direction.

[0153] In other embodiments of the present application, the power module 100 may also provide the first AC signal in the following manner. Specifically:

[0154] The power module 100 can be specifically used to provide a first AC signal according to the movement direction of the load driven by the coil motor 300 .

[0155] In the embodiment of the present application, the load and the direction of movement have been described above and will not be repeated here. Figure 2 For example, if the moving direction is the first direction, the first signal in the first AC signal is at a high level, and the second signal in the first AC signal is at a low level. If the moving direction is the second direction, the first signal in the first AC signal is at a low level, and the second signal in the first AC signal is at a high level.

[0156] by Fig.13 For example, if the motion direction is the first direction, the fourth signal and the second signal in the first AC signal are both high level, and the fifth signal in the first AC signal is low level. If the motion direction is the second direction, the fourth signal and the second signal in the first AC signal are both low level, and the fifth signal in the first AC signal is high level.

[0157] In other embodiments of the present application, in order to achieve flexible control of the load, the power module 100 may further include a first information table.

[0158] The first information table may include multiple second AC signals and multiple routes. The multiple second AC signals correspond to the multiple routes one by one, and each of the multiple routes includes a first starting position and a first end position of the load driven by the coil motor. That is, it can be understood that for each route, the load can be controlled to move from the first starting position in the route to the first end position through the second AC signal corresponding to the route.

[0159] It should be noted that the description of the second AC signal can refer to the description of the first AC signal above, which will not be repeated here.

[0160] Based on this, the power module 100 can be specifically used to match the first AC signal among the multiple second AC signals in the first information table according to the target route, and provide the first AC signal to drive the coil motor 300 so that the load moves from the second starting position to the second end position. The target route includes the second starting position and the second end position of the load.

[0161] Exemplarily, if the load is controlled to move from a second starting position to a second end position, the power module 100 may match the second starting position and the second end position with the first starting position and the first end position in each route in the first information table, determine the second AC signal corresponding to the matched route as the first AC signal, and output the first AC signal.

[0162] Obviously, since the first information table includes multiple second AC signals and multiple routes, the power module 100 can match the first AC signal among the multiple second AC signals in the first information table according to the target route and provide the first AC signal to achieve flexible control of the load.

[0163] like Fig.21 As shown, the embodiment of the present application further provides a camera module 2100, which may include at least one coil motor, a lens assembly 2101, at least one driving circuit, a spring bracket 2102 and a housing 2103, wherein:

[0164] The lens assembly 2101 is connected to the housing 2103 via a spring bracket 2102. At least one coil motor and at least one drive circuit may be disposed at least below the lens assembly 2101 ( Fig.21 (not shown in the figure). At least one driving circuit can adopt any of the driving circuits described above. At least one driving circuit corresponds to at least one coil motor one by one. At least one coil motor is used to drive the lens assembly 2101 to move under the drive of at least one driving circuit.

[0165] Since the spring bracket 2102 is elastic, during the autofocus process, at least one coil motor, driven by at least one driving circuit, drives the lens assembly 2101 to move, and the spring bracket 2102 also contracts or stretches accordingly as the lens assembly 2101 moves.

[0166] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A drive circuit for a coil motor, characterized in that: include: Power module and charge and discharge module, including: The first end of the charge and discharge module is connected to the first end of the power module, the second end of the charge and discharge module is connected to the first end of the coil motor, and the third end of the charge and discharge module, the second end of the power module and the second end of the coil motor are connected; The power module is used to provide a first AC signal; the first AC signal includes a first signal and a second signal that are alternately distributed, the first signal is used to charge the charge-discharge module in a charging stage, and the second signal is used to output to the coil motor in a discharging stage; The charging and discharging module is used to charge under the action of the first signal in the charging stage, and output a third signal to the coil motor in the discharging stage; the second signal and the third signal are used to jointly drive the coil motor; The second signal has the same direction as the third signal.

2. The driving circuit according to claim 1, characterized in that: The charging and discharging module includes a first charging and discharging unit and a first switching unit, wherein: The first end of the first charge and discharge unit is connected to the first end of the power module, the second end of the first charge and discharge unit and the first end of the first switch unit are connected to the first end of the coil motor, and the second end of the first switch unit is connected to the second end of the power module and the second end of the coil motor; The first switch unit is configured to be turned on during the charging phase to charge the first charge-discharge unit through the first signal provided by the power module, and to be turned off during the discharging phase to output the second signal to the coil motor through the power module and output the third signal to the coil motor through the first charge-discharge unit; The first signal and the second signal are in opposite directions.

3. The driving circuit according to claim 1, characterized in that: The charging and discharging module includes a second charging and discharging unit, a third charging and discharging unit, an isolation unit, a second switch unit, a third switch unit and a fourth switch unit, wherein: The first end of the second charge and discharge unit is connected to the second end of the power module and the second end of the coil motor, the second end of the second charge and discharge unit, the second end of the second switch unit, the first end of the third switch unit and the first end of the isolation unit are connected, the second end of the isolation unit and the second end of the fourth switch unit are connected to the first end of the electromagnetic motor, the first end of the second switch unit and the first end of the third charge and discharge unit are connected to the first end of the power module, and the second end of the third charge and discharge unit, the second end of the third switch unit and the first end of the fourth switch unit are connected; The charging stage includes a first charging stage and a second charging stage, and the first signal includes a fourth signal and a fifth signal; In the first charging stage, the second switch unit is turned on, and the third switch unit and the fourth switch unit are turned off, so as to charge the second charge and discharge unit through the fourth signal provided by the power module; In the second charging stage, the second switch unit and the fourth switch unit are turned off, and the third switch unit is turned on, so as to charge the third charge and discharge unit through the fifth signal provided by the power module and the sixth signal provided by the second charge and discharge unit; In the discharge stage, the second switch unit and the third switch unit are turned off, and the fourth switch unit is turned on, so as to output the second signal to the coil motor through the power module, and output the third signal to the coil motor through the third charge-discharge unit; The fourth signal is in opposite directions to the fifth signal, the fourth signal is in the same direction as the second signal, and the fifth signal is in the same direction as the sixth signal.

4. The driving circuit according to claim 2, characterized in that: The first switch unit comprises: a first diode, an anode of which is connected to a first end of the first switch unit; A first switch element, a first end of which is connected to the cathode of the first diode, and a second end of which is connected to the second end of the first switch unit; a second diode, an anode of which is connected to the second end of the first switch unit; A second switch element, a first end of which is connected to the cathode of the second diode, and a second end of which is connected to the first end of the first switch unit; Wherein, when the first signal is at a high level and the second signal is at a low level, the first switch element is turned on and the second switch element is turned off; When the first signal is at a low level and the second signal is at a high level, the first switch element is turned off and the second switch element is turned on.

5. The driving circuit according to claim 2, characterized in that: The first switch unit comprises: a third diode, an anode of which is connected to the first end of the first switch unit; a fourth diode, a cathode of which is connected to the first end of the first switch unit; A first controller, wherein a first end is connected to the cathode of the third diode, a second end is connected to the anode of the fourth diode, and a third end is connected to the second end of the first switch unit, and is used for controlling the cathode of the third diode to be conducted with the second end of the first switch unit or the anode of the fourth diode to be conducted with the second end of the first switch unit according to the first AC signal.

6. The driving circuit according to claim 3, characterized in that: The fifth switch unit is any one of the second switch unit, the third switch unit and the fourth switch unit; the fifth switch unit includes: a fifth diode, an anode of which is connected to the first end of the fifth switch unit; A third switch element, a first end of which is connected to the cathode of the fifth diode, and a second end of which is connected to the second end of the fifth switch unit; a sixth diode, an anode of which is connected to the second end of the fifth switch unit; a fourth switch element, a first end of which is connected to the cathode of the sixth diode, and a second end of which is connected to the first end of the fifth switch unit; Wherein, when the fourth signal and the second signal are at a high level and the fifth signal is at a low level, the third switch element is turned on and the fourth switch element is turned off; When the fourth signal and the second signal are at a low level and the fifth signal is at a high level, the third switch element is turned off and the fourth switch element is turned on.

7. The driving circuit according to claim 3, characterized in that: The fifth switch unit is any one of the second switch unit, the third switch unit and the fourth switch unit; the fifth switch unit includes: a seventh diode, an anode of which is connected to the first end of the fifth switch unit; an eighth diode, a cathode of which is connected to the first end of the fifth switch unit; A second controller, a first end connected to the cathode of the seventh diode, a second end connected to the anode of the eighth diode, and a third end connected to the second end of the fifth switch unit, is used to control the cathode of the seventh diode to be conducted with the second end of the fifth switch unit or the anode of the eighth diode to be conducted with the second end of the fifth switch unit according to the first AC signal.

8. The driving circuit according to claim 2, characterized in that: The first charging and discharging unit comprises: A first capacitor connected between a first end and a second end of the first charge and discharge unit; The capacitance of the first capacitor is greater than the resonant capacitance of the coil of the coil motor.

9. The driving circuit according to claim 3, characterized in that: The second charge and discharge unit includes a second capacitor connected between a first end and a second end of the second charge and discharge unit; The third charge and discharge unit includes a third capacitor, and the third capacitor is connected between the first end and the second end of the third charge and discharge unit; The sum of the capacitances of the second capacitor and the third capacitor is greater than the resonant capacitance of the coil of the coil motor.

10. The driving circuit according to any one of claims 1 to 9, characterized in that: The power supply module is specifically used to provide the first AC signal according to the movement direction of the load driven by the coil motor.

11. The driving circuit according to any one of claims 1 to 9, characterized in that: The power module also includes a first information table; The first information table includes a plurality of second AC signals and a plurality of routes, the plurality of second AC signals correspond to the plurality of routes one by one, and each of the plurality of routes includes a first starting position and a first end position of a load driven by the coil motor; The power supply module is specifically configured to match the first AC signal among a plurality of second AC signals in the first information table according to a target route, and provide the first AC signal; Wherein, the target route includes a second starting position and a second end position of the load.

12. A camera module, comprising at least one coil motor, a lens assembly, and at least one driving circuit according to any one of claims 1 to 11, wherein: The at least one drive circuit corresponds to the at least one coil motor in a one-to-one manner; The at least one coil motor is used to drive the lens assembly to move under the drive of the at least one driving circuit.

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