CN102263537B - Control circuit of linear motor of mobile terminal - Google Patents
Control circuit of linear motor of mobile terminal Download PDFInfo
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- CN102263537B CN102263537B CN201110206946XA CN201110206946A CN102263537B CN 102263537 B CN102263537 B CN 102263537B CN 201110206946X A CN201110206946X A CN 201110206946XA CN 201110206946 A CN201110206946 A CN 201110206946A CN 102263537 B CN102263537 B CN 102263537B
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- 238000003199 nucleic acid amplification method Methods 0.000 claims abstract description 34
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Abstract
The invention discloses a control circuit of a linear motor of a mobile terminal, and the control circuit comprises a filtering module which is used for filtering the harmonic noise output by a baseband chip and an operation amplification module which is used for amplifying a signal output by the filtering module, wherein the filtering module and the operation amplification module are successively connected in series between the PWM (pulse-width modulation) port of the baseband chip and linear motor of the mobile terminal. The control circuit of the linear motor of the mobile terminal provided by the invention has the advantages that the filtering module and the operation amplification module are connected in series between the PWM port of the baseband chip and linear motor of the mobile terminal, thus filtering the higher harmonic noise of the PWM signal output by the baseband chip, outputting a sinusoidal wave signal, and then magnifying the sinusoidal wave signal through the operation amplification module so as to drive the rear linear motor, and realizing the normal drive of the linear motor; and the frequency, duty ratio and amplitude of the PMW signal output by the baseband chip are utilized to change the vibrating effect of the linear motor.
Description
Technical Field
The invention relates to the technical field of communication, in particular to a control circuit of a linear motor of a mobile terminal.
Background
With the explosion of the mobile phone industry, the haptic feedback has been paid attention to by more and more mobile phone manufacturers as an important index of user experience, and the motor is the most important component in the haptic feedback. Compared with the traditional direct current motor, the linear motor gradually replaces the direct current motor due to the advantages of fast response time, low power consumption, high performance and the like, and is widely applied to mobile phone circuits.
At present, a linear motor is generally directly connected to a PWM signal output terminal of a baseband chip, and a driving method of the linear motor is different from a direct current driving method of a direct current motor, and the linear motor needs to be driven by an alternating current signal.
In view of the above, the present invention provides a control circuit for a linear motor of a mobile terminal.
Disclosure of Invention
In view of the above-mentioned shortcomings of the prior art, the present invention is directed to a control circuit for a linear motor of a mobile terminal to solve the problem of driving the linear motor.
In order to achieve the purpose, the invention adopts the following technical scheme:
a control circuit of a linear motor of a mobile terminal, comprising
The filtering module is used for filtering harmonic noise output by the baseband chip;
the operational amplification module is used for amplifying the signal output by the filtering module;
the filtering module and the operational amplification module are sequentially connected in series between a PWM port of a baseband chip of the mobile terminal and the linear motor.
The control circuit of the mobile terminal linear motor is characterized in that the filter module is a second-order low-pass filter module and comprises a first resistor, a second resistor, a first capacitor and a second capacitor; the first end of the first resistor is connected with a PWM (pulse-width modulation) port of a baseband chip of the mobile terminal, the second end of the first resistor is connected with the first end of the second resistor, and the second end of the second resistor is connected with the operational amplification module; the first end of the first capacitor is connected with the second end of the first resistor, and the second end of the first capacitor is grounded; and the first end of the second capacitor is connected with the second end of the second resistor, and the second end of the second capacitor is grounded.
The control circuit of the mobile terminal linear motor is characterized in that the operational amplification module comprises an amplification chip, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor and a third capacitor; the filter module is connected with the reverse input end of the amplification chip through a third resistor, the forward input end of the amplification chip is grounded through a fourth resistor, a power port of the amplification chip is connected with a VDD power supply, a fifth resistor is connected between the reverse input end and the forward output end of the amplification chip in series, a sixth resistor is connected between the forward input end and the reverse output end of the amplification chip in series, one end of a third capacitor is connected with the power port of the amplification chip, and the other end of the third capacitor is grounded; the linear motor is connected in series between the forward output end and the reverse output end of the amplification chip.
The control circuit of the mobile terminal linear motor is characterized in that the voltage of the linear motor is 3.3 times of the voltage of the filter module.
Compared with the prior art, the control circuit of the mobile terminal linear motor provided by the invention has the advantages that the filtering module and the operational amplification module are connected in series between the PWM port of the baseband chip of the mobile terminal and the linear motor, the higher harmonic noise in the PWM signal output by the baseband chip is filtered, the sine wave signal is output, the operational amplification module is used for amplifying the signal and then driving the linear motor, the normal driving of the linear motor is realized, and the vibration effect of the linear motor can be changed by changing the frequency, the duty ratio and the amplitude of the PWM signal output by the baseband chip.
Drawings
Fig. 1 is a block diagram of a control circuit of a linear motor according to a preferred embodiment of the present invention.
FIG. 2 is a schematic circuit diagram of a control circuit of a linear motor according to a preferred embodiment of the present invention.
Fig. 3 is a schematic circuit diagram of a filter module in a control circuit of a linear motor according to the present invention.
Fig. 4 is a schematic circuit diagram of an operational amplifier module in a control circuit of a linear motor according to the present invention.
FIG. 5 is a schematic voltage waveform of an output signal of a baseband chip of a mobile terminal according to the present invention.
FIG. 6 is a waveform diagram of voltage testing of the filter module according to the present invention.
FIG. 7 is a waveform diagram of voltage testing of the operational amplifier module according to the present invention.
Fig. 8 is a voltage test waveform diagram of each signal output by the operational amplifier module according to the present invention.
Fig. 9 is a schematic view of acceleration characteristics of a linear motor.
Detailed Description
The present invention provides a control circuit for a linear motor of a mobile terminal, which will be described in further detail below with reference to the accompanying drawings and examples in order to make the objects, technical solutions and effects of the present invention clearer and clearer. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1, a control circuit of a linear motor S1 of a mobile terminal according to an embodiment of the present invention includes a filtering module and an operational amplifier module, which are sequentially connected in series between a PWM port of a baseband chip of the mobile terminal and the linear motor S1.
The filtering module is used for filtering harmonic noise output by the baseband chip and outputting sine wave alternating current signals, and the operational amplification module is used for amplifying the signals output by the filtering module, so that the voltage at two ends of the linear motor S1 is 3.3 times of the output voltage of the filtering module, and the linear motor S1 is driven to work.
Referring to fig. 2 and fig. 3, the filter module is a second-order low-pass filter module, and includes a first resistor R1, a second resistor R2, a first capacitor C1, and a second capacitor C2. The first end 1 of the first resistor R1 is connected with the PWM port of the baseband chip of the mobile terminal, the second end 2 of the first resistor R1 is connected with the first end 1 of the second resistor R2, and the second end 2 of the second resistor R2 is connected with the operational amplification module. The first end 1 of the first capacitor C1 is connected to the second end 2 of the first resistor R1, the second end 2 of the first capacitor C1 is grounded, the first end 1 of the second capacitor C2 is connected to the second end 2 of the second resistor R2, and the second end 2 of the second capacitor C2 is grounded.
In the embodiment of the invention, the mobile terminal is a mobile phone, a baseband chip of the mobile terminal outputs a rectangular wave signal with the frequency of 175Hz, a waveform diagram of the rectangular wave signal is shown in FIG. 5, and because the rectangular wave signal contains higher harmonic noise with the frequency of 175Hz, the invention adopts a second-order low-pass filtering module to filter the higher harmonic noise.
In specific implementation, the cut-off frequency of the second-order low-pass filtering module is 175Hz, and after the PWM signal of the baseband chip passes through the second-order low-pass filtering module, the following results can be obtained:
In the present example, R1=1K Ω, R2=1K Ω, C1=1uf, C2=500nf,
=1.8V, and the above data is substituted into equation 1 and equation 2,
wherein,
is the voltage amplitude of the first order low-pass filtering,the voltage waveform is shown in fig. 6 for the second order low pass filtered voltage amplitude. As can be seen from fig. 6, when the rectangular wave with an amplitude of 1.8V and a frequency of 175Hz passes through the first-order low-pass filter (i.e., the filter formed by the first resistor R1 and the first capacitor C1), the higher harmonic components are not completely filtered, so that the signal PWM _ RC1 has distortion, but the higher harmonic components in the rectangular wave after being filtered by the second-order low-pass filter (i.e., the filter formed by the second resistor and the second capacitor C2) are substantially filtered, and a sine wave signal PWM _ RC2 with an amplitude of 1V and a frequency of 175Hz is output.
Referring to fig. 2 and 4, in the embodiment of the invention, the operational amplifier module includes an amplifier chip U1, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, and a third capacitor C3. The filter module passes through third resistance R3 and amplifies the reverse input IN-of chip U1 and links to each other, amplify the forward input IN + of chip U1 and pass through fourth resistance R4 ground connection, amplify the power port VCC and the VDD power of chip U1 and meet, fifth resistance R5 establishes ties between the reverse input IN-of amplifying chip U1 and forward output OUT +, and sixth resistance R6 establishes ties between the forward input IN + of amplifying chip U1 and reverse output OUT-, and third electric capacity C3's one end links to each other with the power port VCC that amplifies chip U1, and the other end is ground connection. The linear motor S1 is connected in series between the positive output end OUT + and the negative output end OUT-of the amplifying chip U1, and the GND port of the amplifying chip is grounded.
Depending on the characteristics of the amplification chip,
wherein, the third resistor R3 and the fourth resistor R4 are both 50 Ω, and the fifth resistor R5 and the sixth resistor R6 are both 165 Ω, so when GPIO is high level, the amplifying chip is enabled, starts to work, and the voltage difference between two ends of the motor
=
The voltage waveforms are shown in fig. 7 and 8. As can be seen from fig. 7 and 8, after the signal output by the filtering module is amplified by the operational amplifying module, the voltage of the linear motor S1 is 3.3 times of the voltage of the filtering module, so that the linear motor can be normally driven.
Please refer to fig. 9, which is a schematic diagram of an acceleration characteristic waveform of the linear motor S1, wherein the linear motor S1 has the highest acceleration and the highest vibration strength at a frequency of 175 Hz. When the frequency is higher or lower than 175Hz, the acceleration is reduced, and the vibration intensity is reduced. Thus, varying the frequency of the PWM signal output by the baseband chip varies the vibration intensity of the linear motor S1. The acceleration of the linear motor S1 may be controlled by a voltage, and when the voltage is high, the acceleration increases and the vibration intensity increases. Therefore, the vibration intensity of the linear motor S1 can be changed by changing the amplitude of the PWM signal output from the baseband chip or by changing the duty ratio of the PWM signal.
In summary, the operation amplification module is added to the second-order filtering module to drive the linear motor, so that the voltage at two ends of the linear motor is 3.3 times of that of the second-order filtering module, thereby realizing the normal driving of the linear motor, and the invention can also change the vibration effect of the linear motor by changing the frequency, duty ratio and amplitude of the PWM signal output by the baseband chip.
It should be understood that equivalents and modifications of the technical solution and inventive concept thereof may occur to those skilled in the art, and all such modifications and alterations should fall within the scope of the appended claims.
Claims (3)
1. A control circuit of a linear motor of a mobile terminal is characterized by comprising
The filtering module is used for filtering harmonic noise output by the baseband chip;
the operational amplification module is used for amplifying the signal output by the filtering module;
the filtering module and the operational amplification module are sequentially connected in series between a PWM port of a baseband chip of the mobile terminal and the linear motor;
the operational amplification module comprises an amplification chip, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor and a third capacitor; the filter module is connected with the reverse input end of the amplification chip through a third resistor, the forward input end of the amplification chip is grounded through a fourth resistor, a power port of the amplification chip is connected with a VDD power supply, a fifth resistor is connected between the reverse input end and the forward output end of the amplification chip in series, a sixth resistor is connected between the forward input end and the reverse output end of the amplification chip in series, one end of a third capacitor is connected with the power port of the amplification chip, and the other end of the third capacitor is grounded; the linear motor is connected in series between the forward output end and the reverse output end of the amplification chip.
2. The control circuit of the linear motor of the mobile terminal according to claim 1, wherein the filter module is a second-order low-pass filter module including a first resistor, a second resistor, a first capacitor and a second capacitor; the first end of the first resistor is connected with a PWM (pulse-width modulation) port of a baseband chip of the mobile terminal, the second end of the first resistor is connected with the first end of the second resistor, and the second end of the second resistor is connected with the operational amplification module; the first end of the first capacitor is connected with the second end of the first resistor, and the second end of the first capacitor is grounded; and the first end of the second capacitor is connected with the second end of the second resistor, and the second end of the second capacitor is grounded.
3. The control circuit of the linear motor of the mobile terminal according to claim 1, wherein the voltage of the linear motor is 3.3 times the voltage of the filter module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110206946XA CN102263537B (en) | 2011-07-22 | 2011-07-22 | Control circuit of linear motor of mobile terminal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110206946XA CN102263537B (en) | 2011-07-22 | 2011-07-22 | Control circuit of linear motor of mobile terminal |
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| CN102263537A CN102263537A (en) | 2011-11-30 |
| CN102263537B true CN102263537B (en) | 2013-11-06 |
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| CN201110206946XA Expired - Fee Related CN102263537B (en) | 2011-07-22 | 2011-07-22 | Control circuit of linear motor of mobile terminal |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109874398A (en) * | 2017-01-04 | 2019-06-11 | 华为技术有限公司 | A kind of driving method and terminal of linear motor |
| CN106685199A (en) * | 2017-03-16 | 2017-05-17 | 上海青橙实业有限公司 | Motor circuit and mobile terminal |
| CN107888113A (en) * | 2017-11-23 | 2018-04-06 | 淮阴师范学院 | A kind of switched reluctance machines Speed Sensorless Control Method |
| CN112180762B (en) * | 2020-09-29 | 2021-10-29 | 瑞声新能源发展(常州)有限公司科教城分公司 | Nonlinear signal system construction method, apparatus, device and medium |
| CN112716636A (en) * | 2020-12-04 | 2021-04-30 | 上海向方科技有限公司 | Low-noise sound wave electric toothbrush and sound wave motor driving circuit and driving method thereof |
| CN114777818B (en) * | 2022-03-09 | 2024-03-15 | 西门子数控（南京）有限公司 | Signal excitation unit of encoder and encoder |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1913335A (en) * | 2006-08-25 | 2007-02-14 | 天津三星电机有限公司 | Device for controlling motor oscillating by audio frequency |
| CN101605174A (en) * | 2009-07-15 | 2009-12-16 | 中兴通讯股份有限公司 | A mobile terminal and method for realizing vibration mode thereof |
| CN101884166A (en) * | 2007-10-01 | 2010-11-10 | 阿莱戈微系统公司 | Linear Motor Controller Based on Hall Effect |
| CN201639531U (en) * | 2010-02-09 | 2010-11-17 | 青岛海信移动通信技术股份有限公司 | Waveform transformation circuit and mobile terminal provided with same |
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2011
- 2011-07-22 CN CN201110206946XA patent/CN102263537B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1913335A (en) * | 2006-08-25 | 2007-02-14 | 天津三星电机有限公司 | Device for controlling motor oscillating by audio frequency |
| CN101884166A (en) * | 2007-10-01 | 2010-11-10 | 阿莱戈微系统公司 | Linear Motor Controller Based on Hall Effect |
| CN101605174A (en) * | 2009-07-15 | 2009-12-16 | 中兴通讯股份有限公司 | A mobile terminal and method for realizing vibration mode thereof |
| CN201639531U (en) * | 2010-02-09 | 2010-11-17 | 青岛海信移动通信技术股份有限公司 | Waveform transformation circuit and mobile terminal provided with same |
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Effective date of registration: 20201230 Address after: 224000 No. 1013, Incubation Park, Xiangshui Industrial Economic Zone, Xiangshui County, Yancheng City, Jiangsu Province Patentee after: Yancheng shunyutong Information Technology Co.,Ltd. Address before: 510000 No. 106 Fengze East Road, Nansha District, Guangzhou City, Guangdong Province Patentee before: Guangzhou shengxia Intellectual Property Operation Co.,Ltd. Effective date of registration: 20201230 Address after: 510000 No. 106 Fengze East Road, Nansha District, Guangzhou City, Guangdong Province Patentee after: Guangzhou shengxia Intellectual Property Operation Co.,Ltd. Address before: 516006 Guangdong province Huizhou Zhongkai hi tech Development Zone No. 23 District Patentee before: HUIZHOU TCL MOBILE COMMUNICATION Co.,Ltd. |
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