CN110022110B - Voice coil motor damping control circuit - Google Patents
Voice coil motor damping control circuit Download PDFInfo
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- CN110022110B CN110022110B CN201910369039.3A CN201910369039A CN110022110B CN 110022110 B CN110022110 B CN 110022110B CN 201910369039 A CN201910369039 A CN 201910369039A CN 110022110 B CN110022110 B CN 110022110B
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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
- H02P23/00—Arrangements or methods for the control of AC motors characterised by a control method other than vector control
- H02P23/04—Arrangements or methods for the control of AC motors characterised by a control method other than vector control specially adapted for damping motor oscillations, e.g. for reducing hunting
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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
- H02P25/032—Reciprocating, oscillating or vibrating motors
- H02P25/034—Voice coil motors
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- Control Of Linear Motors (AREA)
Abstract
The invention discloses a voice coil motor damping control circuit, which comprises: the control algorithm module receives a target displacement signal of the voice coil motor and outputs a displacement signal of each step for controlling the voice coil motor; and the processing circuit is connected with the output end of the control algorithm module and is integrated with a multiplier and a digital-to-analog converter, the processing circuit multiplies the displacement signal of each step by an external damping coefficient to obtain a damping displacement signal of each step, and the damping displacement signal of each step is subjected to digital-to-analog conversion to output an analog control signal of the voice coil motor. The invention modifies the digital-to-analog conversion module on the original basis of the voice coil motor system, realizes the function of introducing the damping coefficient under the condition of small resource increase, avoids the defect of using a multiplier in a digital circuit, occupies less resources, has no extra calculation time and does not increase extra power consumption.
Description
Technical Field
The invention relates to the field of voice coil motor control and integrated circuits, in particular to a voice coil motor damping control circuit.
Background
With the development of the mobile phone industry, the mobile phone camera is also continuously updated. The vibration damping coefficient of a voice coil motor used for a mobile phone camera on the current market is gradually increased. When the voice coil motor damping coefficient increases to a certain extent, the motor control algorithm needs to take into account the influence of the introduced damping coefficient.
As shown in fig. 1, in a voice coil motor control system of the prior art, a target displacement 101 for controlling a voice coil motor is subjected to a control algorithm 102 to obtain a displacement 103 per step; the product of each step of displacement 103 and the damping coefficient 105 in the multiplier 104 obtains each step of damping displacement 106, and the displacement 106 passes through the digital-to-analog converter 107 to obtain the analog control signal 108 of the voice coil motor.
In the prior art, a damping coefficient is introduced into an algorithm, and a moving coefficient caused by the damping coefficient needs to be multiplied by a control mode of each step of the original algorithm, so that the influence of the damping coefficient is counteracted. The introduction of the damping coefficient requires the use of an additional multiplier. In a digital circuit, the application of the multiplier needs to occupy larger resources, the operation time is long, and dynamic power consumption is consumed.
Disclosure of Invention
The invention provides a voice coil motor damping control circuit, which realizes the function of introducing a damping coefficient under the condition of not additionally increasing resources.
In order to achieve the above object, the present invention provides a voice coil motor damping control circuit, which is characterized in that the circuit comprises:
the control algorithm module receives a target displacement signal of the voice coil motor and outputs a displacement signal of each step for controlling the voice coil motor;
and the processing circuit is connected with the output end of the control algorithm module and is integrated with a multiplier and a digital-to-analog converter, the processing circuit multiplies the displacement signal of each step by an external damping coefficient to obtain a damping displacement signal of each step, and the damping displacement signal of each step is subjected to digital-to-analog conversion to output an analog control signal of the voice coil motor.
The processing circuit adopts a first processing circuit integrated with a current type multiplier and a digital-to-analog converter or a second processing circuit integrated with a resistance type multiplier and a digital-to-analog converter.
The first processing circuit includes:
the auxiliary digital-to-analog conversion circuit is connected with an external damping coefficient and outputs the damping coefficient;
the main digital-to-analog conversion circuit is connected with each step of displacement signals output by the control algorithm module, the damping coefficient output by the auxiliary digital-to-analog conversion circuit is connected with the main digital-to-analog conversion circuit as a bias current, and the analog control signals of the voice coil motor are output through digital-to-analog conversion after the product of each step of displacement signals and the damping coefficient.
The auxiliary digital-to-analog conversion circuit is a current type digital-to-analog conversion circuit, the input end of the auxiliary digital-to-analog conversion circuit is connected with an external damping coefficient, an external reference current is used as a bias current and is connected into the auxiliary digital-to-analog conversion circuit, and the reference current is controlled by the damping coefficient and is output to the main digital-to-analog conversion circuit to be used as the bias current.
An amplifying circuit is electrically connected between the auxiliary digital-to-analog conversion circuit and the main digital-to-analog conversion circuit, and the output of the auxiliary digital-to-analog conversion circuit is amplified by beta times to reach the current of 1 least significant bit of the main digital-to-analog conversion circuit.
The bias current Ibias of the main digital-to-analog conversion circuit is as follows:
Ibias＝Ibase×C_ks (1)
in the formula (1), C _ ks represents a binary code corresponding to the damping coefficient; ibase is reference current; the current of the 1 least significant bit LSB of the main digital-to-analog conversion circuit is as follows (2):
1LSB＝β×Ibias (2)
in the formula (2), beta is the amplification factor of the bias current Ibias;
substituting formula (1) into formula (2) to obtain formula (3):
1LSB＝β×Ibase×C_ks (3)
the output Iout of the main digital-to-analog conversion circuit is as follows:
Iout＝C_step×1LSB (4)
c _ step in the formula (4) represents the binary code corresponding to each step of displacement;
substituting formula (3) for formula (4) to obtain formula (5):
Iout＝C_step×β×Ibase×C_ks (5)
the output current of equation (5) is the analog control signal of the voice coil motor output by the main digital-to-analog conversion circuit.
The second processing circuit includes:
the main digital-to-analog conversion circuit is accessed to the displacement signal of each step output by the control algorithm module, and the displacement signal of each step is output after digital-to-analog conversion;
and the load circuit is connected with an external damping coefficient and each step of displacement signal output by the main digital-to-analog conversion circuit, and outputs an analog control signal of the voice coil motor after the product of each step of displacement signal and the damping coefficient.
The load circuit comprises a plurality of resistors connected in series between the input end of the load circuit and the ground; the input end of the load circuit is connected with the resistors and the adjacent resistors are connected with the output end of the load circuit through a plurality of switches respectively, and the switches are connected with external damping coefficients respectively.
The output current Iout of the main digital-to-analog conversion circuit is determined by each step of moving displacement, and is expressed by the formula (6):
Iout＝C_step×1LSB (6)
in the formula (6), C _ step represents the binary code corresponding to each step of displacement, and 1LSB represents that the bias current accessed by the main digital-to-analog conversion circuit is set as the current of the 1 least significant bit LSB of the main digital-to-analog conversion circuit;
the resistance value of the load circuit is controlled by a damping coefficient, and the resistance Rout is as follows:
Rout＝C_ks×R (7)
in the formula (7), R represents the value of each reference resistor in the load resistor string, and C _ ks represents a binary code corresponding to the damping coefficient;
the output voltage Vout obtained by combining the formulas (6) and (7) is as shown in the formula (8):
Vout＝Iout×Rout＝C_step×1LSB×C_ks×R (8)
in equation (8), the output voltage Vout is an analog control signal of the voice coil motor.
The main digital-to-analog conversion circuit comprises:
the drain electrode of the first MOSFET is connected with the grid electrode of the first MOSFET and is connected with the bias current of the main digital-to-analog conversion circuit;
the sources of the second MOSFETs are mutually connected and connected to the source of the first MOSFET, the grids of the second MOSFETs are mutually connected and connected to the grid of the first MOSFET, and the drain of each second MOSFET is respectively connected with the output of the main digital-to-analog conversion circuit through a switch; each switch switches in a displacement signal of each step.
Compared with the prior art, the voice coil motor damping control circuit has the advantages that the processing circuit integrated with the multiplier and the digital-to-analog converter is provided, the digital-to-analog conversion module is modified on the original basis of a voice coil motor system, the function of introducing the damping coefficient is realized under the condition that too many resources are not additionally added, the defect that the multiplier is used in a digital circuit is overcome, the multiplier occupies less resources, does not have extra calculation time, and does not increase extra power consumption.
Drawings
FIG. 1 is a circuit block diagram of a prior art voice coil motor damping control circuit;
FIG. 2 is a circuit block diagram of a voice coil motor damping control circuit according to the present invention;
FIG. 3 is a schematic circuit diagram of a voice coil motor damping control circuit according to a first embodiment of the present invention;
FIG. 4 is a schematic circuit diagram of an auxiliary DAC circuit according to an embodiment;
fig. 5 is a schematic circuit diagram of a voice coil motor damping control circuit according to a second embodiment of the present invention.
Detailed Description
The following further describes specific embodiments of the present invention with reference to the drawings.
As shown in fig. 2, the present invention discloses a voice coil motor damping control circuit, which comprises: the control algorithm module 202 and the circuit at the output of the control algorithm module 202 are connected with the processing circuit 204.
The control algorithm module 202 receives a target displacement signal 201 of the voice coil motor, and obtains and outputs a displacement signal 203 for controlling each step of the voice coil motor through a control algorithm.
The processing circuit 204 is electrically connected to the output end of the control algorithm module and is integrated with a multiplier and a digital-to-analog converter, the multiplier in the invention is realized by an analog circuit on the original structure of the system in fig. 1, and compared with the prior art shown in fig. 1, the voice coil motor damping control circuit in the invention shown in fig. 2 omits the multiplier. The processing circuit 204 multiplies the displacement signal 203 of each step by an external damping coefficient 205 to obtain a damping displacement signal of each step, performs digital-to-analog conversion on the damping displacement signal of each step, and outputs an analog control signal 206 of the voice coil motor.
The processing circuit 204 of the voice coil motor damping control circuit of the present invention can have two embodiments: in the first embodiment, a first processing circuit integrated with a current-type multiplier and a digital-to-analog converter is adopted, and in the second embodiment, a second processing circuit integrated with a resistance-type multiplier and a digital-to-analog converter is adopted.
Example one
As shown in fig. 3, the first processing circuit includes: an auxiliary digital-to-analog conversion circuit 320 (auxiliary DAC), a main digital-to-analog conversion circuit 310 (main DAC), and an amplification circuit.
The input end of the auxiliary digital-to-analog conversion circuit 320 is connected to the external damping coefficient 205, the output of the auxiliary digital-to-analog conversion circuit 320 is amplified by beta times through an amplifying circuit, and then is connected to the main digital-to-analog conversion circuit 310 as the bias current of the main digital-to-analog conversion circuit 310, wherein the bias current of the main digital-to-analog conversion circuit 310 is set as the current of the 1 least significant bit (1LSB) of the main digital-to-analog conversion circuit.
The main digital-to-analog conversion circuit 310 includes a first MOSFET311, a plurality of second MOSFETs 312, and a plurality of switches 313. The drain and gate of the first MOSFET311 are connected and access the bias current Ibias of the main digital-to-analog conversion circuit 310. The sources of the second MOSFETs 312 are connected to each other and to the source of the first MOSFET311, the gates of the second MOSFETs 312 are connected to each other and to the gate of the first MOSFET311, and the drain of each second MOSFET312 is connected to the output of the main digital-to-analog conversion circuit 310 through a switch 313; each switch 313 switches in each step of the displacement signal 203.
The main digital-to-analog conversion circuit 310 is connected to the displacement signal 203 of each step output by the control algorithm module, the damping coefficient 205 output by the auxiliary digital-to-analog conversion circuit 320 is connected to the main digital-to-analog conversion circuit 310 as the bias current Ibias, the product of the displacement signal 203 of each step and the damping coefficient 205 is subjected to digital-to-analog conversion, and the output end Iout of the main digital-to-analog conversion circuit 310 outputs the analog control signal of the voice coil motor.
As shown in fig. 4, an embodiment of the auxiliary dac 320 is a current-mode dac having a structure similar to the main dac 310, but with a much smaller precision than the main dac 310. The auxiliary digital-to-analog conversion circuit 320 includes a third MOSFET401, a number of fourth MOSFETs 402, and a number of switches 403.
The drain and the gate of the third MOSFET401 are connected to the reference current Ibase, the drain is grounded through an ammeter, the gates of the fourth MOSFETs 402 are connected to each other and to the gate of the third MOSFET401, the sources of the fourth MOSFETs 402 are connected to each other and to the source of the third MOSFET401, the drain of each fourth MOSFET402 is connected to the output of the auxiliary digital-to-analog conversion circuit 320 through a switch 403, respectively, as the bias current of the main digital-to-analog conversion circuit 310; each switch 403 switches in a damping factor 205.
In summary, the relationship between the first processing circuit and the multiplier for digital-to-analog conversion in the first embodiment is as follows:
the bias current Ibias of the main digital-to-analog conversion circuit 310 is as follows:
Ibias＝Ibase×C_ks (1)
in the formula (1), C _ ks represents a binary code corresponding to the damping coefficient; ibase is reference current; the current of the 1 least significant bit LSB of the main digital-to-analog conversion circuit 310 is as follows (2):
1LSB＝β×Ibias (2)
in the formula (2), beta is the amplification factor of the bias current Ibias;
substituting formula (1) into formula (2) to obtain formula (3):
1LSB＝β×Ibase×C_ks (3)
the output Iout of the main dac 310 is as follows:
Iout＝C_step×1LSB (4)
c _ step in the formula (4) represents the binary code corresponding to each step of displacement;
substituting formula (3) for formula (4) to obtain formula (5):
Iout＝C_step×β×Ibase×C_ks (5)
as shown in equation (5), the analog control signal of the Iout voice coil motor output by the main dac 310 realizes the product of the damping coefficient and the displacement of each step, i.e., realizes the multiplication function.
Example two
As shown in fig. 5, the second processing circuit includes: a main digital-to-analog conversion circuit 510 and a load circuit.
The main digital-to-analog conversion circuit 510 is connected to the displacement signal 203 of each step output by the control algorithm module, and the displacement signal of each step is output after digital-to-analog conversion.
The main digital-to-analog conversion circuit 510 has the same circuit structure as the main digital-to-analog conversion circuit 310, and includes a fifth MOSFET511, a plurality of sixth MOSFETs 512, and a plurality of switches 513. The drain and gate of the fifth MOSFET511 are connected to receive the bias current Ibias of 1LSB of the main digital-to-analog conversion circuit 510. The sources of the sixth MOSFETs 512 are connected with each other and with the source of the fifth MOSFET511, the gates of the sixth MOSFETs 512 are connected with each other and with the gate of the fifth MOSFET511, and the drain of each sixth MOSFET512 is connected with the output of the main digital-to-analog conversion circuit 510 through a switch 513; each switch 513 switches in each step of the displacement signal 203.
The load circuit is connected with the external damping coefficient 205 and the output of the main digital-to-analog conversion circuit 510, and outputs the analog control signal of the voice coil motor in the form of output voltage Vout after multiplying the displacement signal 203 of each step by the damping coefficient 205.
The load circuit comprises a first resistor R1, a second resistor R2, a third resistor R3 and a fourth resistor R4 which are connected in series between the input end of the load circuit and the ground. The input end of the load circuit is connected with the output Vout of the load circuit through a switch between the fourth resistor R4, the third resistor R3 and the fourth resistor R4, the third resistor R3 and the second resistor R2, and the first resistor R1 and the second resistor R2, and the switches are respectively connected with the external damping coefficient 205.
In summary, the relationship between the second processing circuit and the multiplier for digital-to-analog conversion in the second embodiment is as follows:
the output current Iout of the main dac circuit 510 is determined by each step of the shift displacement, as shown in equation (6):
Iout＝C_step×1LSB (6)
in the formula (6), C _ step represents the binary code corresponding to each step of displacement, and 1LSB represents that the bias current accessed by the main digital-to-analog conversion circuit 510 is set to be the current of the 1 least significant bit LSB of the main digital-to-analog conversion circuit;
the resistance value of the load circuit is controlled by a damping coefficient, and the resistance Rout is as follows:
Rout＝C_ks×R (7)
in the formula (7), R represents the value of each reference resistor (R1, R2, R3, R4) in the load resistor string, and C _ ks represents a binary code corresponding to the damping coefficient;
the output voltage Vout obtained by combining the formulas (6) and (7) is as shown in the formula (8):
Vout＝Iout×Rout＝C_step×1LSB×C_ks×R (8)
in equation (8), the output voltage Vout is obtained by multiplying the displacement and the damping coefficient at each step, and an analog control signal of the voice coil motor is output.
The DACs in the first embodiment and the second embodiment are provided with multiplication functions, and in order to realize the multiplication functions, additional resources on the main DAC are less; in addition, as the multiplication function is directly realized in the conversion process, no extra operation time is needed; the resulting structure does not require additional dynamic power consumption.
While the present invention has been described in detail with reference to the preferred embodiments, it should be understood that the above description should not be taken as limiting the invention. Various modifications and alterations to this invention will become apparent to those skilled in the art upon reading the foregoing description. Accordingly, the scope of the invention should be determined from the following claims.
Claims (10)
1. A voice coil motor damping control circuit, the circuit comprising:
the control algorithm module receives a target displacement signal of the voice coil motor and outputs a displacement signal of each step for controlling the voice coil motor;
the processing circuit is connected with the output end of the control algorithm module through a circuit and is integrated with a multiplier and a digital-to-analog converter, the damping coefficient output by the auxiliary digital-to-analog converter circuit is used as a bias current to be connected into the main digital-to-analog converter circuit, or a plurality of switches connected with an external damping coefficient are used for changing the output load resistance of the main digital-to-analog converter circuit, each step of damping displacement signals are obtained by multiplying each step of displacement signals and the external damping coefficient, digital-to-analog conversion is carried out on each step of damping displacement signals, and analog control signals of the voice coil motor are output.
2. The vcm according to claim 1, wherein the processing circuit comprises a first processing circuit integrated with a current multiplier and a dac, or a second processing circuit integrated with a resistive multiplier and a dac.
3. The voice coil motor damping control circuit of claim 2, wherein the first processing circuit comprises:
the auxiliary digital-to-analog conversion circuit is connected with an external damping coefficient and outputs the damping coefficient;
the main digital-to-analog conversion circuit is connected with each step of displacement signals output by the control algorithm module, the damping coefficient output by the auxiliary digital-to-analog conversion circuit is connected with the main digital-to-analog conversion circuit as a bias current, and the analog control signals of the voice coil motor are output through digital-to-analog conversion after the product of each step of displacement signals and the damping coefficient.
4. The voice coil motor damping control circuit of claim 3, wherein the auxiliary DAC circuit is a current-type DAC circuit, an input terminal of the auxiliary DAC circuit is connected to an external damping coefficient, an external reference current is connected to the auxiliary DAC circuit as a bias current, and the reference current is controlled by the damping coefficient and output to the main DAC circuit as the bias current.
5. The voice coil motor damping control circuit of claim 3, wherein an amplifier circuit is electrically connected between the auxiliary DAC circuit and the main DAC circuit, and amplifies the output of the auxiliary DAC circuit by β times to reach the current of 1 least significant bit of the main DAC circuit.
6. The vcm damping control circuit of claim 5, wherein the bias current Ibias of the primary dac is as follows (1):
Ibias＝Ibase×C_ks (1)
in the formula (1), C _ ks represents a binary code corresponding to the damping coefficient; ibase is reference current;
the current of the 1 least significant bit LSB of the main digital-to-analog conversion circuit is as follows (2):
1LSB＝β×Ibias (2)
in the formula (2), beta is the amplification factor of the bias current Ibias;
substituting formula (1) into formula (2) to obtain formula (3):
the output Iout of the main digital-to-analog conversion circuit is represented by formula (4) where 1LSB is β × Ibase × C _ ks (3):
Iout＝C_step×1LSB (4)
c _ step in the formula (4) represents the binary code corresponding to each step of displacement;
substituting formula (3) for formula (4) to obtain formula (5):
Iout＝C_step×β×Ibase×C_ks (5)
the output current of equation (5) is the analog control signal of the voice coil motor output by the main digital-to-analog conversion circuit.
7. The voice coil motor damping control circuit of claim 2, wherein the second processing circuit comprises:
the main digital-to-analog conversion circuit is accessed to the displacement signal of each step output by the control algorithm module, and the displacement signal of each step is output after digital-to-analog conversion;
and the load circuit is connected with an external damping coefficient and each step of displacement signal output by the main digital-to-analog conversion circuit, and outputs an analog control signal of the voice coil motor after the product of each step of displacement signal and the damping coefficient.
8. The voice coil motor damping control circuit of claim 7, wherein the load circuit comprises a plurality of resistors connected in series between an input of the load circuit and ground; the input end of the load circuit is connected with the resistors and the adjacent resistors are connected with the output end of the load circuit through a plurality of switches respectively, and the switches are connected with external damping coefficients respectively.
9. The vcm damping control circuit of claim 7, wherein the output current Iout of the main dac is determined by each step of the shift displacement, as shown in equation (6):
Iout＝C_step×1LSB (6)
in the formula (6), C _ step represents the binary code corresponding to each step of displacement, and 1LSB represents that the bias current accessed by the main digital-to-analog conversion circuit is set as the current of the 1 least significant bit LSB of the main digital-to-analog conversion circuit;
the resistance value of the load circuit is controlled by a damping coefficient, and the resistance Rout is as follows:
Rout＝C_ks×R (7)
in the formula (7), R represents the value of each reference resistor in the load resistor string, and C _ ks represents a binary code corresponding to the damping coefficient;
the output voltage Vout obtained by combining the formulas (6) and (7) is as shown in the formula (8):
Vout＝Iout×Rout＝C_step×1LSB×C_ks×R (8)
in equation (8), the output voltage Vout is an analog control signal of the voice coil motor.
10. The ring motor damping control circuit according to any one of claims 3 to 9, wherein the main digital-to-analog conversion circuit comprises:
the drain electrode of the first MOSFET is connected with the grid electrode and is connected with the bias current of the main digital-to-analog conversion circuit;
the sources of the second MOSFETs are mutually connected and connected to the source of the first MOSFET, the grids of the second MOSFETs are mutually connected and connected to the grid of the first MOSFET, and the drain of each second MOSFET is respectively connected with the output of the main digital-to-analog conversion circuit through a switch; each switch switches in a displacement signal of each step.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105785820A (en) * | 2016-03-28 | 2016-07-20 | 聚辰半导体(上海)有限公司 | Shaping signal control method for voice coil actuator of camera |
| CN107733437A (en) * | 2016-08-11 | 2018-02-23 | 三星电机株式会社 | Voice coil motor actuator drive and its driving method |
| CN107807553A (en) * | 2016-09-09 | 2018-03-16 | 欧姆龙株式会社 | Control device and control program |
| CN108718196A (en) * | 2018-08-01 | 2018-10-30 | 武汉韦尔半导体有限公司 | A kind of amplifier imbalance self-calibration circuit applied to voice coil motor driving chip |
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| JP5549119B2 (en) * | 2009-05-31 | 2014-07-16 | 日本テキサス・インスツルメンツ株式会社 | Disk drive |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105785820A (en) * | 2016-03-28 | 2016-07-20 | 聚辰半导体(上海)有限公司 | Shaping signal control method for voice coil actuator of camera |
| CN107733437A (en) * | 2016-08-11 | 2018-02-23 | 三星电机株式会社 | Voice coil motor actuator drive and its driving method |
| CN107807553A (en) * | 2016-09-09 | 2018-03-16 | 欧姆龙株式会社 | Control device and control program |
| CN108718196A (en) * | 2018-08-01 | 2018-10-30 | 武汉韦尔半导体有限公司 | A kind of amplifier imbalance self-calibration circuit applied to voice coil motor driving chip |
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