CN116054680A - Motor driving circuit and terminal equipment - Google Patents
Motor driving circuit and terminal equipment Download PDFInfo
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- CN116054680A CN116054680A CN202211000885.6A CN202211000885A CN116054680A CN 116054680 A CN116054680 A CN 116054680A CN 202211000885 A CN202211000885 A CN 202211000885A CN 116054680 A CN116054680 A CN 116054680A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P25/00—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details
- H02P25/02—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details characterised by the kind of motor
- H02P25/06—Linear motors
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
- H02M1/088—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P25/00—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details
- H02P25/16—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details characterised by the circuit arrangement or by the kind of wiring
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Abstract
The embodiment of the application provides a motor driving circuit and terminal equipment, which can reduce cost. The motor driving circuit includes: the power module is used for outputting alternating voltage; an inductive coupling module comprising a primary inductor and a secondary inductor for coupling an ac voltage to the linear motor; the first electrode of the parallel capacitor is respectively electrically connected with one end of the secondary side inductor and the positive end of the linear motor, the second electrode of the parallel capacitor is electrically connected with the first end of the switch module, and the second end of the switch module is respectively electrically connected with the other end of the secondary side inductor and the negative end of the linear motor; the control module is electrically connected with the control end of the switch module and used for controlling the on-off of the switch module; when at least one of the switch modules is controlled to conduct, a parallel capacitor electrically connected to the conducting switch module is connected in parallel with the secondary side inductance to increase an ac voltage coupled to the linear motor.
Description
Technical Field
The application relates to the technical field of circuits, in particular to a motor driving circuit and terminal equipment.
Background
The linear motor (Linear Resonant Actuator, LRA) has been widely used in various vibration occasions of terminal equipment such as a mobile phone by virtue of its strong, abundant, crisp and low energy consumption. To achieve vibration of the linear motor, a separate motor driving chip is generally required to drive the linear motor. However, the cost of the terminal is high due to the high cost of the motor driving chip.
Disclosure of Invention
In order to solve the technical problems, the application provides a motor driving circuit and terminal equipment. The motor driving circuit can replace a motor driving chip, and when the terminal equipment can only drive the linear motor at low voltage, the motor driving circuit can realize high-voltage driving, and has simple structure and low cost.
In a first aspect, an embodiment of the present application provides a switching circuit, a power module, and a power module, where the power module is configured to output an ac voltage; the inductive coupling module comprises a primary side inductor and a secondary side inductor, one end of the primary side inductor is electrically connected with the positive electrode of the power supply module, the other end of the primary side inductor is electrically connected with the negative electrode of the power supply module, one end of the secondary side inductor is electrically connected with the positive end of the linear motor, and the other end of the secondary side inductor is electrically connected with the negative end of the linear motor and is used for coupling alternating voltage to the linear motor; the first electrode of the parallel capacitor is respectively electrically connected with one end of the secondary side inductor and the positive end of the linear motor, the second electrode of the parallel capacitor is electrically connected with the first end of the switch module, and the second end of the switch module is respectively electrically connected with the other end of the secondary side inductor and the negative end of the linear motor; the control module is electrically connected with the control end of the switch module and used for controlling the on-off of the switch module; when at least one of the switch modules is controlled to conduct, the parallel capacitor electrically connected with the conducted switch module is connected in parallel with the secondary side inductor to increase the alternating voltage coupled to the linear motor.
When the parallel capacitance is in parallel with the secondary side inductance, the secondary side impedance is reduced compared to when the parallel capacitance is not in parallel. According to the voltage gain formula, when the impedance of the secondary side is reduced, the voltage gain is increased, namely, the voltage gain of the voltage received by the linear motor and the voltage gain of the alternating voltage output by the power supply module are increased, and under the condition that the alternating voltage output by the power supply module is unchanged, the voltage received by the linear motor is increased, that is, the motor driving circuit realizes high-voltage driving, and the structure is simple and the cost is low.
The motor driving circuit comprises a parallel capacitor group, and when the motor driving circuit comprises a parallel capacitor group, the motor driving circuit is simple in structure and low in cost. The motor driving module comprises a plurality of parallel capacitor groups, and when the plurality of parallel capacitor groups are connected with the secondary side inductor in parallel, the impedance of the secondary side can be further reduced, and the motor driving module is further coupled to the voltage of the linear motor.
Illustratively, each parallel capacitor group may include a parallel capacitor, and when the parallel capacitor group includes a parallel capacitor, the structure is simple and the cost is low. Each parallel capacitor group can also comprise a plurality of parallel capacitors, when the parallel capacitor group comprises a plurality of parallel capacitors, the plurality of parallel capacitors can be simultaneously connected with the secondary side inductor in parallel, so that the impedance of the secondary side can be further reduced, the voltage coupled to the linear motor can be further reduced, part of the plurality of parallel capacitors are connected with the secondary side inductor in parallel, namely, the switch module corresponding to the part of capacitors is conducted, the switch module corresponding to the rest of capacitors is turned off, and the switch module can be specifically determined according to the driving voltage required by the linear motor and the signal received by the control end of the switch module.
In some possible implementations, the motor drive module further includes a first compensation capacitance and a second compensation capacitance; the first compensation capacitor is connected in series with the primary inductor, and the second compensation capacitor is connected in series with the secondary inductor. According to the impedance formula, when the first compensation capacitor is connected in series with the primary inductor, the blocking effect of the primary inductor on the alternating voltage can be weakened; when the second compensation capacitor is connected with the secondary side inductor in series, the blocking effect of the secondary side inductor on the alternating voltage can be weakened.
In some possible implementations, the power module is multiplexed into the control module, so that the cost of the motor driving circuit is reduced without separately setting the control module, and when the motor driving circuit is applied to the terminal equipment, the cost of the terminal equipment can be reduced.
In some possible implementations, on the basis that the power supply module is multiplexed into the control module, each parallel capacitor group includes two parallel capacitors and two switch modules, the two parallel capacitors include a first parallel capacitor and a second parallel capacitor, and the two switch modules include a first switch module and a second switch module; the first electrode of the first parallel capacitor and the first electrode of the second parallel capacitor are electrically connected with the positive end of the linear motor, the second electrode of the first parallel capacitor is electrically connected with the first end of the first switch module, the second electrode of the second parallel capacitor is electrically connected with the first end of the second switch module, the second end of the first switch module and the second end of the second switch module are electrically connected with the negative end of the linear motor, the control end of the first switch module is electrically connected with the positive electrode of the power module, and the control end of the second switch module is electrically connected with the negative electrode of the power module; the power supply module is used for outputting a first alternating voltage in a transient vibration stage of the linear motor, and the voltage output by the positive electrode of the power supply module controls the conduction of the first parallel capacitor or the voltage output by the negative electrode of the power supply module controls the conduction of the second parallel capacitor; the power supply module is used for outputting a second alternating voltage in a steady-state vibration stage of the linear motor, the voltage output by the positive electrode of the power supply module controls the first parallel capacitor to be turned off, and the voltage output by the negative electrode of the power supply module controls the second parallel capacitor to be turned off. The AC voltage output by the power supply module is directly used for controlling the parallel capacitor to be connected into the circuit or not, and the power supply module is not required to be independently used for controlling, so that the operation steps of the power supply module can be reduced.
The ac voltage output by the power module is, for example, a sine wave or a square wave, so that, on the premise that the power module outputs the first ac voltage, the first switch module can be controlled to be turned on, for example, so that the first parallel capacitor is connected in parallel with the secondary inductor, and when the negative electrode of the power module outputs the positive voltage, the second switch module can be controlled to be turned on, for example, so that the second parallel capacitor is connected in parallel with the secondary inductor, that is, when the power module outputs the first ac voltage, at least one parallel capacitor is connected in parallel with the secondary inductor, so that the impedance of the secondary side is reduced, and the voltage received by the linear motor is increased.
In some possible implementations, on the basis that the parallel capacitor groups include two parallel capacitors and two switch modules, each parallel capacitor group further includes two voltage division modules, where the two voltage division modules include a first voltage division module and a second voltage division module; one end of the first voltage division module is electrically connected with the positive electrode of the power supply module, and the other end of the first voltage division module is electrically connected with the control end of the first switch module; one end of the second voltage division module is electrically connected with the negative electrode of the power supply module, and the other end of the second voltage division module is electrically connected with the control end of the second switch module. The switch module is controlled to be turned on or off after the alternating voltage output by the power module is divided, so that the switch module can be selected more flexibly.
In some possible implementations, on the basis that each parallel capacitor group further includes two voltage dividing modules, the voltage dividing modules include a first resistor and a second resistor; one end of a first resistor in the first voltage division module is electrically connected with the positive electrode of the power supply module, the other end of the first resistor in the first voltage division module is electrically connected with the control end of the first switch module and one end of a second resistor respectively, and the other end of the second resistor in the first voltage division module is grounded; one end of a first resistor in the second voltage division module is electrically connected with the negative electrode of the power supply module, the other end of the first resistor in the second voltage division module is electrically connected with the control end of the second switch module and one end of the second resistor respectively, and the other end of the second resistor in the second voltage division module is grounded. The voltage dividing module has simple structure and low cost.
In some possible implementations, the switch module includes a structure with a switching function, such as a mosfet, and in this embodiment, the switch module includes a mosfet for example only, and other structures with switching functions are all within the protection scope of the embodiments of the present application.
In some possible implementations, the power module is a power management chip in the terminal device, so that the cost of the motor driving circuit is reduced without separately setting the power module, and when the motor driving circuit is applied to the terminal device, the cost of the terminal device can be reduced.
In some possible implementations, the inductive coupling module includes a common mode inductance, a coupled inductance, a transformer, or the like.
In a second aspect, an embodiment of the present application provides a terminal device, including a motor driving circuit according to the first aspect or any implementation manner of the first aspect, and since the motor driving circuit used in the terminal device according to the embodiment of the present application is a motor driving circuit according to the first aspect or any implementation manner of the first aspect, the two may solve the same technical problem and achieve the same expected effect.
Drawings
Fig. 1 is a schematic structural diagram of a terminal device provided in an embodiment of the present application;
fig. 2 is a schematic structural diagram of a motor driving circuit of a terminal according to an embodiment of the present application;
fig. 3 is a schematic structural diagram of a further motor driving circuit of the terminal according to the embodiment of the present application;
fig. 4 is a schematic structural diagram of a further motor driving circuit of the terminal according to the embodiment of the present application;
fig. 5 is a schematic structural diagram of a further motor driving circuit of the terminal according to the embodiment of the present application;
fig. 6 is a schematic structural diagram of a further motor driving circuit of the terminal according to the embodiment of the present application;
fig. 7 is a schematic structural diagram of a further motor driving circuit of the terminal according to the embodiment of the present application.
Detailed Description
The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are some, but not all, of the embodiments of the present application. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application.
The term "and/or" is herein merely an association relationship describing an associated object, meaning that there may be three relationships, e.g., a and/or B, may represent: a exists alone, A and B exist together, and B exists alone.
The terms first and second and the like in the description and in the claims of embodiments of the present application are used for distinguishing between different objects and not necessarily for describing a particular sequential order of objects. For example, the first target object and the second target object, etc., are used to distinguish between different target objects, and are not used to describe a particular order of target objects.
In the embodiments of the present application, words such as "exemplary" or "such as" are used to mean serving as examples, illustrations, or descriptions. Any embodiment or design described herein as "exemplary" or "for example" should not be construed as preferred or advantageous over other embodiments or designs. Rather, the use of words such as "exemplary" or "such as" is intended to present related concepts in a concrete fashion.
In the description of the embodiments of the present application, unless otherwise indicated, the meaning of "a plurality" means two or more. For example, the plurality of processing units refers to two or more processing units; the plurality of systems means two or more systems.
The terminal equipment such as a mobile phone and a tablet personal computer can prompt the user in a sound mode, and also prompt the user in a vibration mode so as to improve the user experience of the terminal equipment. For example, for a conference scene, when a user performs certain operations on a mobile phone, in order to avoid interference caused by a mobile phone prompt tone to other users in the conference scene, the mobile phone can prompt the user in a vibration mode. For another example, when the mobile phone receives an incoming call request, in order to prompt the user to respond to the incoming call request in time, the mobile phone can prompt the user in a ringing and vibrating mode at the same time. In particular, when a user performs some operations in the terminal, in order to improve the user use experience, the terminal may perform vibration feedback or the like in time when the user's operations are detected. Wherein the generation of the vibration is realized by a motor arranged in the terminal, that is, the motor is arranged in the terminal, and the vibration prompt is realized by the vibration of the motor.
Motors used in terminal equipment can be classified into two main types, one being a rotor motor and the other being a linear motor, wherein the rotor motor is classified into a general motor and a flat motor, and the linear motor is classified into a longitudinal (Z-axis) linear motor and a transverse (X-axis) linear motor. Since the linear motor (Linear Resonant Actuator, LRA) has the advantages of strong, abundant, crisp vibration, low energy consumption, etc., the embodiment of the present application will be described with reference to the case where the motor applied to the terminal is a linear motor.
Linear motors are generally classified into two types, transient vibration (also referred to as short vibration) and steady-state vibration (also referred to as long vibration). The steady-state vibration is vibration with a mild vibration feeling and a long duration time when the mobile phone vibrates, and accordingly, the mobile phone can be driven by a low voltage to drive the linear motor. Transient vibration is vibration that when the mobile phone vibrates, the mobile phone vibration feeling is stronger, the duration is shorter, and accordingly, the linear motor needs to be driven by a larger voltage (also called high voltage).
And when the terminal can only output low voltage, a separate motor driving chip is required to drive the linear motor to realize transient vibration and steady-state vibration. However, the cost of the terminal is high due to the high cost of the motor driving chip.
Based on this, this application embodiment provides a motor drive circuit, can replace motor drive chip, when the terminal can only low-pressure drive linear motor, realizes high-pressure drive through this motor drive circuit, simple structure, with low costs. The motor driving circuit is applied to terminal equipment, and the terminal equipment can be any terminal equipment capable of carrying out vibration prompt through the vibration of the linear motor. The terminal device may be a mobile phone, a computer, a tablet computer, a personal digital assistant (personal digital assistant, PDA for short), a vehicle-mounted computer, an intelligent wearable device (such as an intelligent watch), an intelligent home device, etc., and the specific form of the terminal is not particularly limited in the embodiments of the present application.
Taking a mobile phone as an example, referring to fig. 1, fig. 1 shows a schematic structural diagram of a terminal device. It should be understood that the terminal device 100 shown in fig. 1 is only one example of a terminal device, and that the terminal device 100 may have more or fewer components than shown in the drawings, may combine two or more components, or may have a different configuration of components. The various components shown in fig. 1 may be implemented in hardware, software, or a combination of hardware and software, including one or more signal processing and/or application specific integrated circuits.
As shown in fig. 1, the terminal device 100 includes: processor 110, external memory interface 120, internal memory 121, universal serial bus (universal serial bus, USB) interface 130, charge management module 140, power management module 141, battery 142, antenna 1, antenna 2, mobile communication module 150, wireless communication module 160, audio module 170, speaker 170A, receiver 170B, microphone 170C, headset interface 170D, sensor module 180, motor drive circuit 190, linear motor 191, indicator 192, camera 193, display 194, and subscriber identity module (subscriber identification module, SIM) card interface 195, etc. The sensor module 180 may include a pressure sensor, a gyroscope sensor, a magnetic sensor, an acceleration sensor, a distance sensor, a proximity sensor, a fingerprint sensor, a temperature sensor, a touch sensor, an ambient light sensor, a bone conduction sensor, and the like.
The processor 110 may include one or more processing units, such as: the processor 110 may include an application processor (application processor, AP), a modem processor, a graphics processor (graphics processing unit, GPU), an image signal processor (image signal processor, ISP), a controller, a memory, a video codec, a digital signal processor (digital signal processor, DSP), a baseband processor, and/or a neural network processor (neural-network processing unit, NPU), etc. Wherein the different processing units may be separate devices or may be integrated in one or more processors.
The controller may be a neural center and a command center of the terminal device 100. The controller can generate operation control signals according to the instruction operation codes and the time sequence signals to finish the control of instruction fetching and instruction execution.
A memory may also be provided in the processor 110 for storing instructions and data. In some embodiments, the memory in the processor 110 is a cache memory.
In some embodiments, the processor 110 may include one or more interfaces through which electrical connections and control with other modules of the terminal device 100 are made. The interfaces may include an integrated circuit (inter-integrated circuit, I2C) interface, an integrated circuit built-in audio (inter-integrated circuit sound, I2S) interface, a pulse code modulation (pulse code modulation, PCM) interface, a universal asynchronous receiver transmitter (universal asynchronous receiver/transmitter, UART) interface, a mobile industry processor interface (mobile industry processor interface, MIPI), a general-purpose input/output (GPIO) interface, a subscriber identity module (subscriber identity module, SIM) interface, and/or a universal serial bus (universal serial bus, USB) interface, among others.
USB interface 130 is an interface conforming to the USB standard specification, and may specifically be an USB Type C interface or the like. USB interface 130 may be used to electrically connect a power adapter to charge terminal device 100 and may also be used to transfer data between devices. Specifically, the processor 110 is electrically connected to the USB interface 130, and the processor 110 determines the type of device to which the USB interface 130 is connected based on the signal of the USB interface 130. But also to electrically connect headphones (e.g., digital headphones, etc.), through which audio is played. The interface may also be used to electrically connect other terminal devices, such as AR devices, etc.
The charge management module 140 is configured to receive a charge input from a charger. The charger may be a wireless charger or a wired charger (such as a power adapter). The charging management module 140 may also supply power to the terminal device through the power management module 141 while charging the battery 142.
The power management module 141 (also referred to as a power management chip) is used to connect the battery 142, the charge management module 140, and the processor 110. The power management module 141 receives input from the battery 142 and/or the charge management module 140 and provides power to the processor 110, the internal memory 121, the external memory, the display 194, the camera 193, the wireless communication module 160, and the like. The power management module 141 may also be configured to monitor battery capacity, battery cycle number, battery health (leakage, impedance) and other parameters. In other embodiments, the power management module 141 may also be provided in the processor 110. In other embodiments, the power management module 141 and the charge management module 140 may be disposed in the same device.
The wireless communication function of the terminal device 100 can be implemented by the antenna 1, the antenna 2, the mobile communication module 150, the wireless communication module 160, a modem processor, a baseband processor, and the like.
The antennas 1 and 2 are used for transmitting and receiving electromagnetic wave signals. Each antenna in the terminal device 100 may be used to cover a single or multiple communication bands. Different antennas may also be multiplexed to improve the utilization of the antennas. For example: the antenna 1 may be multiplexed into a diversity antenna of a wireless local area network. In other embodiments, the antenna may be used in conjunction with a tuning switch.
The mobile communication module 150 may provide a solution including 2G/3G/4G/5G wireless communication applied to the terminal device 100. The mobile communication module 150 may include at least one filter, switch, power amplifier, low noise amplifier (low noise amplifier, LNA), etc.
The wireless communication module 160 may provide solutions for wireless communication including wireless local area network (wireless local area networks, WLAN) (e.g., wireless fidelity (wireless fidelity, wi-Fi) network), bluetooth (BT), global navigation satellite system (global navigation satellite system, GNSS), frequency modulation (frequency modulation, FM), near field wireless communication technology (near field communication, NFC), infrared technology (IR), etc., applied to the terminal device 100.
In some embodiments, antenna 1 and mobile communication module 150 of terminal device 100 are coupled, and antenna 2 and wireless communication module 160 are coupled, such that terminal device 100 may communicate with a network and other devices via wireless communication techniques.
The terminal device 100 implements display functions through a GPU, a display screen 194, an application processor, and the like. The GPU is a microprocessor for image processing, and is connected to the display 194 and the application processor. The GPU is used to perform mathematical and geometric calculations for graphics rendering. Processor 110 may include one or more GPUs that execute program instructions to generate or change display information.
The display screen 194 is used to display images, videos, and the like. The display 194 includes a display panel. In some embodiments, the terminal device 100 may include 1 or N display screens 194, N being a positive integer greater than 1.
The external memory interface 120 may be used to connect an external memory card, such as a Micro SD card, to realize expansion of the memory capability of the terminal device 100. The external memory card communicates with the processor 110 through an external memory interface 120 to implement data storage functions. For example, files such as music, video, etc. are stored in an external memory card.
The internal memory 121 may be used to store computer executable program code including instructions. The processor 110 executes various functional applications of the terminal device 100 and data processing by executing instructions stored in the internal memory 121. The internal memory 121 may include a storage program area and a storage data area. The storage program area may store an application program (such as a sound playing function, an image playing function, etc.) required for at least one function of the operating system, etc. The storage data area may store data (such as audio data, phonebook, etc.) created during use of the terminal device 100, and the like. In addition, the internal memory 121 may include a high-speed random access memory, and may further include a nonvolatile memory such as at least one magnetic disk storage device, a flash memory device, a universal flash memory (universal flash storage, UFS), and the like.
The terminal device 100 may implement audio functions through an audio module 170, a speaker 170A, a receiver 170B, a microphone 170C, an earphone interface 170D, an application processor, and the like. Such as music playing, recording, etc.
The linear motor 191 may generate a vibration cue. The linear motor 191 may be used for incoming call vibration alerting as well as for touch vibration feedback. For example, touch operations acting on different applications (e.g., photographing, audio playing, etc.) may correspond to different vibration feedback effects. The linear motor 191 may also correspond to different vibration feedback effects by touch operations applied to different areas of the display screen 194. Different application scenarios (such as time reminding, receiving information, alarm clock, game, etc.) can also correspond to different vibration feedback effects. The touch vibration feedback effect may also support customization. In this embodiment, when the terminal device can only drive the linear motor 191 at low voltage, the high-voltage driving of the linear motor 191 can be achieved through the external-lap motor driving circuit 190, and a special high-voltage driving chip is not required.
The motor driving circuit provided in the embodiment of the present application will be described in detail.
Referring to fig. 2, fig. 2 shows a schematic structural diagram of a motor driving circuit according to an embodiment of the present application. As shown in fig. 2, the motor driving circuit 190 includes a power module 11, a control module 12, an inductive coupling module 13, a first compensation capacitor C1, a second compensation capacitor C2, and at least one parallel capacitor group, each parallel capacitor group includes at least one parallel capacitor C3 and a switch module 14 electrically connected to the parallel capacitor C3, i.e., each parallel capacitor C3 corresponds to one switch module 14. The inductive coupling module 13 includes a primary inductance L1 and a secondary inductance L2.
One end of the primary inductor L1 is electrically connected with the positive pole V+ of the power module 11, and the other end of the primary inductor L1 is electrically connected with the negative pole V-of the power module 11. One end of the secondary side inductor L2 is electrically connected with the positive end of the linear motor 191 and the first electrode of the parallel capacitor C3, the other end of the secondary side inductor L2 is electrically connected with the negative end of the linear motor 191 and the second end of the switch module 14, respectively, and the second electrode of the parallel capacitor C3 is electrically connected with the first end of the switch module 14, that is, each parallel capacitor group is parallel to the secondary side inductor L2.
The control terminal of the switch module 14 is electrically connected to the control module 12. The first compensation capacitor C1 is connected in series with the primary inductor L1, and the second compensation capacitor C2 is connected in series with the secondary inductor L2. That is, the first compensation capacitor C1 is located between the positive pole v+ of the power module 11 and one end of the primary inductor L1, and the second compensation capacitor C2 is located between the positive end of the linear motor 191 and one end of the secondary inductor L2. The power module 11 is used for outputting an alternating voltage V1. The inductive coupling module 13 is used to couple the ac voltage V1 output from the power supply module 11 to the linear motor 191. The control module 12 is used for controlling on or off of the switch module 14.
When the switch module 14 is turned off, that is, the parallel capacitor C3 is not connected to the circuit, that is, the secondary inductor L2 and the second compensation capacitor C2 connected in series are not connected in parallel to the parallel capacitor C3, the voltage gain of the voltage V2 received by the linear motor 191 and the ac voltage V1 output by the power module 11 is:
wherein G is the voltage gain; j is an imaginary symbol; ω=2pi f, f being the ac operating frequency;
m is mutual inductance, K is coupling coefficient, L is a certain value 1 Is the inductance value of the primary inductance L1, L 2 The inductance value of the secondary inductance L2; r is R L The resistance value of the equivalent load; z is Z P Is the impedance of the primary side, in particular the capacitance Z of the first compensation capacitor C1 C1 Inductance Z with primary inductance L1 L1 And (3) summing; z is Z S Is the impedance of the secondary side, in particular the capacitance Z of the second compensation capacitor C2 C2 Inductive reactance Z with secondary inductance L2 L2 And (3) summing.
When the switch module 14 is turned on, that is, the parallel capacitor C3 is connected to the circuit, that is, the series secondary inductor L2 and the second compensation capacitor C2 are connected in parallel with the parallel capacitor C3. Secondary impedance Z S The process is as follows:
the secondary impedance after the parallel connection becomes smaller, and the voltage gain becomes larger, that is, the voltage V2 received by the linear motor 191 becomes larger.
And (3) bringing the parallel secondary impedance into the voltage gain formula, namely bringing the formula (2) into the formula (1), taking the integral modulus of the voltage gain formula, and simplifying to obtain the voltage gain change:
wherein G' is the voltage gain after the change; r is R 1 The resistance value of the resistor equivalent to the primary side; r is R 2 The resistance value of the resistor equivalent to the secondary side; x is X 1 Is the reactance of the primary side, in particular the reactance X of the first compensation capacitor C1 C1 Reactance X with primary inductance L1 L1 And (3) summing; x is X 2 ' is the reactance of the secondary; c (C) 2 The capacitance value of the second compensation capacitor C2; c (C) 3 The capacitance value of the parallel capacitor C3; l (L) 2 The inductance value of the secondary inductance L2.
Therefore, as can be seen from the above, the voltage gain can be controlled by controlling whether the parallel capacitor C3 is connected (whether the switch module 14 is turned on or not), thereby realizing the boosting. The specific values of the above parameters can be determined specifically based on the driving voltage required for the linear motor 191, the ac voltage output from the power module 11, and the above formulas.
It should be noted that the above example is described by taking the motor driving circuit 190 including one parallel capacitor group, and each parallel capacitor group includes one parallel capacitor C3 and one switch module 14 as an example. In other alternative embodiments, the motor driving circuit 190 may further include one parallel capacitor group, where each parallel capacitor group includes a plurality of parallel capacitors C3 and a switch module 14 electrically connected to the parallel capacitors C3, for example, referring to fig. 3, fig. 3 shows still another schematic structure of the motor driving circuit provided in the embodiments of the present application. As shown in fig. 3, each parallel capacitor group includes two parallel capacitors C3 and two switch modules 14, and the two parallel capacitors C3 and the two switch modules 14 are electrically connected in a one-to-one correspondence. Alternatively, the motor drive circuit 190 includes a plurality of parallel capacitor banks, each including at least one parallel capacitor C3 and the switch module 14 electrically connected to the parallel capacitor C3. When the plurality of parallel capacitors C3 are connected to the circuit, that is, the plurality of parallel capacitors C3 are connected in parallel with the secondary inductor L2, the impedance of the secondary can be further reduced, and the voltage V2 received by the linear motor 191 can be further increased.
The process of the motor driving circuit driving the linear motor to achieve steady-state vibration and transient vibration is described below with reference to fig. 2.
When the linear motor 191 is required to vibrate in a steady state, the power module 11 outputs a second ac voltage, the control module 12 controls the switch module 14 to be turned off, i.e. the parallel capacitor C3 is not connected to the circuit, and at this time, the inductive coupling module 13 couples the second ac voltage output by the power module 11 to the linear motor 191 to drive the linear motor 191 to vibrate in a steady state.
When the linear motor 191 is required to vibrate in a transient state, the power module 11 outputs a first ac voltage, the control module 12 is configured to monitor the ac voltage output by the power module 11 in real time, and when it is monitored that the ac voltage output by the power module 11 is the first ac voltage, the control switch module 14 is controlled to be turned on, and the parallel capacitor C3 is connected to the circuit, where the secondary side impedance Z is used S The voltage gain G becomes smaller, so that the ratio of the voltage V2 received by the linear motor 191 to the voltage of the ac voltage V1 output by the power module 11 becomes larger, thereby realizing the step-up driving of the linear motor 191 without separately providing a motor driving chip, and having a simple structure and low cost.
In one scenario, when the mobile phone receives an incoming call request, in order to prompt the user to respond to the incoming call request in time, the mobile phone may prompt the user in a vibration manner, and the linear motor 191 needs to be rapidly started from a static state to reach a larger vibration amount, and then continuously vibrate. When the linear motor 191 is rapidly started from the stationary state and the vibration amount is large, the power module 11 outputs a first ac voltage, for example, a 5V sine wave or a square wave, and at the same time, the control module 12 controls the switch module 14 to be turned on based on the monitored first ac voltage, the parallel capacitor C3 is connected to the circuit, the voltage gain G is increased, and the voltage V2 received by the linear motor 191 is increased, for example, to 10V, so as to achieve boost driving of the linear motor 191, so that the linear motor 191 is rapidly started. After the vibration is started, the power module 11 outputs a second ac voltage, for example, a sine wave or a square wave of 1.8V, and at the same time, the control module 12 controls the switch module 14 to be turned off based on the monitored second ac voltage, the parallel capacitor C3 is not connected to a circuit, and the voltage V2 received by the linear motor 191 may be, for example, an ac voltage output by the power module 11, for example, 1.8V, that is, a voltage gain of the voltage V2 received by the linear motor 191 and the ac voltage V1 output by the power module 11 is 1, so that the linear motor 191 continuously vibrates.
To further reduce the cost of the motor drive circuit and thus the cost of the terminal device. Referring to fig. 4, fig. 4 shows still another schematic structural diagram of the motor driving circuit provided in the embodiment of the present application. As shown in fig. 4, the power module 11 in the motor driving circuit 190 is multiplexed into the control module 12, that is, the control end of the switch module 14 is electrically connected with the power module 11, and the power module 11 outputs the ac voltage and also outputs the control signal for controlling the switch module 14 to be turned on, so that the control module 12 does not need to be separately arranged.
In order to reduce the operation steps of the power module 11, referring to fig. 5, fig. 5 shows a schematic diagram of a motor driving circuit according to an embodiment of the present application. As shown in fig. 5, each parallel capacitor group includes two parallel capacitors C3 and two switch modules 14, the two parallel capacitors C3 include a first parallel capacitor C31 and a second parallel capacitor C32, and the two switch modules 14 include a first switch module 141 and a second switch module 142; the control end of the first switch module 141 is electrically connected to the positive pole v+ of the power module 11, and the control end of the second switch module 142 is electrically connected to the negative pole V-of the power module 11. In the transient vibration phase of the linear motor 191, that is, when the linear motor 191 is required to vibrate in a transient state, the power module 11 is configured to output a first ac voltage, and the voltage output by the positive pole v+ of the power module 11 controls the first switch module 141 to be turned on, or the voltage output by the negative pole V-of the power module 11 controls the second switch module 142 to be turned on. The power module 11 is configured to output a second ac voltage during a steady-state vibration phase of the linear motor 191, i.e., when steady-state vibration of the linear motor 191 is required, the voltage output by the positive pole v+ of the power module 11 controls the first switch module 141 to be turned off, and the voltage output by the negative pole V-of the power module 11 controls the second switch module 142 to be turned off.
For example, when the linear motor 191 is required to vibrate in a steady state, the power module 11 outputs an ac voltage of 1.8V, the positive electrode v+ of the power module 11 and the negative electrode V-of the power module 11 alternately output an ac voltage of 1.8V, and at this time, the voltages of the control terminals of the first switch module 141 and the second switch module 142 are lower than the self-turn-on threshold voltage, and the first parallel capacitor C31 and the second parallel capacitor C32 are not connected to the circuit. At this time, the ratio of the voltage V2 received by the linear motor 191 to the ac voltage V1 output from the power module 11 is close to 1, and the linear motor 191 vibrates in a steady state.
When the linear motor 191 is required to vibrate in a transient state, the power module 11 outputs an alternating voltage of 5V, the positive pole v+ of the power module 11 and the negative pole V-of the power module 11 alternately output 5V, at this time, the voltages at the control ends of the first switch module 141 and the second switch module 142 are alternately higher than the self-conduction threshold voltage, and the first parallel capacitor C31 and the second parallel capacitor C32 are alternately connected into the circuit. At this time, the impedance of the secondary side decreases, the voltage gain increases, that is, the ratio of the voltage V2 received by the linear motor 191 to the ac voltage V1 output by the power module 11 increases, that is, the voltage V2 received by the linear motor 191 increases without changing the ac voltage V1 output by the power module 11, thereby implementing boost driving of the linear motor 191.
In order to expand the selection range of the switch module 14, referring to fig. 6, fig. 6 shows a schematic diagram of a motor driving circuit according to an embodiment of the present application. As shown in fig. 6, each parallel capacitor group further includes two voltage dividing modules, and the voltage dividing modules include a first resistor R1 and a second resistor R2. The two voltage division modules comprise a first voltage division module and a second voltage division module, one end of a first resistor R1 in the first voltage division module is electrically connected with a positive pole V+ of the power supply module 11, the other end of the first resistor R1 in the first voltage division module is respectively electrically connected with a control end of the first switch module 141 and one end of a second resistor R2, and the other end of the second resistor R2 in the first voltage division module is grounded; one end of a first resistor R1 in the second voltage division module is electrically connected with a negative electrode V-of the power supply module 11, the other end of the first resistor R1 in the second voltage division module is electrically connected with a control end of the second switch module 142 and one end of a second resistor R2 respectively, and the other end of the second resistor R2 in the second voltage division module 142 is grounded.
That is, the signal at the control terminal of the first switch module 141 is obtained by dividing the voltage output by the positive pole v+ of the power module 11 by the first resistor R1 and the second resistor R2, and the signal at the control terminal of the second switch module 142 is obtained by dividing the voltage output by the negative pole V-of the power module 11 by the first resistor R1 and the second resistor R2, so that the selection range of the switch module 14 can be widened.
For the types of the switch modules 14 described above, the embodiment of the present application does not limit the types of the switch modules 14, as long as the structure capable of implementing the switch function is within the protection scope of the embodiment of the present application. The switching module 14 is, for example, a metal oxide semiconductor field effect transistor (Metal Oxide Semiconductor Field Effect Transistor, MOSFET).
In this case, the types of the first and second switch modules 141 and 142 may be the same or different, for example, the types of the first and second switch modules 141 and 142 may be the same, for example, N-type MOSFETs.
Of course, it is also possible to use an N-type MOSFET and a P-type MOSFET, and the first switch module 141 is an N-type MOSFET and the second switch module 142 is a P-type MOSFET.
In this case, referring to fig. 7, fig. 7 shows still another schematic structural diagram of the motor driving circuit provided in the embodiment of the present application. As shown in fig. 7, the control end of the second switch module 142 is electrically connected to the control end of the first switch module 141, for example, both are electrically connected to the positive pole v+ of the power module 11, or both are electrically connected to the negative pole V-of the power module 11, so that each parallel capacitor group may only be provided with a group of voltage dividing modules, which simplifies the circuit structure and reduces the cost.
As for the type of the power supply module 11, the embodiment of the present application does not limit the type of the power supply module 11 as long as an alternating voltage can be output and the linear motor 191 can be driven to vibrate. The power management chip 141 may be, for example, multiplexed to the power module 11, so that the cost of the motor driving circuit 190 is reduced without separately providing the power module 11, and the cost of the terminal device 100 is reduced when the motor driving circuit 190 is applied to the terminal device.
As for the type of the inductive coupling module 13, the embodiment of the present application does not limit the type of the inductive coupling module 13, as long as the ac voltage output from the power supply module 11 can be coupled to the linear motor 191. Illustratively, the inductive coupling module 13 includes a common mode inductance, a coupling voltage, a transformer, or the like. When the inductive coupling module 13 comprises a common mode inductance, a coupling inductance, a miniaturized design of the terminal device is facilitated.
The above embodiments are merely for illustrating the technical solution of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.
Claims (10)
1. A motor drive circuit, comprising:
the power module is used for outputting alternating voltage;
the inductive coupling module comprises a primary side inductor and a secondary side inductor, one end of the primary side inductor is electrically connected with the positive electrode of the power supply module, the other end of the primary side inductor is electrically connected with the negative electrode of the power supply module, one end of the secondary side inductor is electrically connected with the positive end of the linear motor, and the other end of the secondary side inductor is electrically connected with the negative end of the linear motor and is used for coupling the alternating voltage to the linear motor;
at least one parallel capacitor group, each parallel capacitor group comprises at least one switch module and at least one parallel capacitor, a first electrode of the parallel capacitor is respectively and electrically connected with one end of the secondary side inductor and a positive end of the linear motor, a second electrode of the parallel capacitor is electrically connected with the first end of the switch module, and a second end of the switch module is respectively and electrically connected with the other end of the secondary side inductor and a negative end of the linear motor;
the control module is electrically connected with the control end of the switch module and used for controlling the switch module to be turned on or off; when at least one of the switch modules is controlled to conduct, the parallel capacitor electrically connected with the conducted switch module is connected in parallel with the secondary side inductor to increase the alternating voltage coupled to the linear motor.
2. The motor drive circuit of claim 1, further comprising a first compensation capacitance and a second compensation capacitance;
the first compensation capacitor is connected in series with the primary inductor, and the second compensation capacitor is connected in series with the secondary inductor.
3. The motor drive circuit of claim 1, wherein the power module is multiplexed as the control module.
4. A motor drive circuit according to claim 3, wherein each of the parallel capacitance groups includes two parallel capacitances and two switch modules, the two parallel capacitances including a first parallel capacitance and a second parallel capacitance, the two switch modules including a first switch module and a second switch module; the control end of the first switch module is electrically connected with the positive electrode of the power supply module, and the control end of the second switch module is electrically connected with the negative electrode of the power supply module;
in the transient vibration stage of the linear motor, the power supply module is used for outputting a first alternating voltage, the voltage output by the positive electrode of the power supply module controls the first switch module to be conducted, or the voltage output by the negative electrode of the power supply module controls the second switch module to be conducted;
in a steady-state vibration stage of the linear motor, the power supply module is used for outputting a second alternating voltage, the voltage output by the positive electrode of the power supply module controls the first switch module to be turned off, and the voltage output by the negative electrode of the power supply module controls the second switch module to be turned off.
5. The motor drive circuit of claim 4, wherein each of the parallel capacitor banks further comprises two voltage dividing modules, the two voltage dividing modules comprising a first voltage dividing module and a second voltage dividing module;
one end of the first voltage division module is electrically connected with the positive electrode of the power supply module, and the other end of the first voltage division module is electrically connected with the control end of the first switch module;
one end of the second voltage division module is electrically connected with the negative electrode of the power supply module, and the other end of the second voltage division module is electrically connected with the control end of the second switch module.
6. The motor drive circuit of claim 5, wherein the voltage divider module comprises a first resistor and a second resistor;
one end of a first resistor in the first voltage division module is electrically connected with the positive electrode of the power supply module, the other end of the first resistor in the first voltage division module is electrically connected with the control end of the first switch module and one end of the second resistor respectively, and the other end of the second resistor in the first voltage division module is grounded;
one end of a first resistor in the second voltage division module is electrically connected with the negative electrode of the power supply module, the other end of the first resistor in the second voltage division module is electrically connected with the control end of the second switch module and one end of the second resistor respectively, and the other end of the second resistor in the second voltage division module is grounded.
7. The motor drive circuit according to any one of claims 1 to 6, wherein the switching module includes a metal oxide semiconductor field effect transistor.
8. The motor drive circuit according to any one of claims 1 to 6, wherein the power module is a power management chip in a terminal device.
9. The motor drive circuit of any one of claims 1-6, wherein the inductive coupling module comprises a common mode inductance, a coupled inductance, or a transformer.
10. A terminal device comprising the motor drive circuit of any one of claims 1-9.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211000885.6A CN116054680B (en) | 2022-08-19 | 2022-08-19 | Motor driving circuit and terminal equipment |
| PCT/CN2023/089379 WO2024037013A1 (en) | 2022-08-19 | 2023-04-20 | Motor driving circuit and terminal device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211000885.6A CN116054680B (en) | 2022-08-19 | 2022-08-19 | Motor driving circuit and terminal equipment |
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| CN116054680A true CN116054680A (en) | 2023-05-02 |
| CN116054680B CN116054680B (en) | 2023-10-27 |
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| WO (1) | WO2024037013A1 (en) |
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