CN107666264B - The driving circuit of voice coil motor - Google Patents
The driving circuit of voice coil motor Download PDFInfo
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- CN107666264B CN107666264B CN201710899094.4A CN201710899094A CN107666264B CN 107666264 B CN107666264 B CN 107666264B CN 201710899094 A CN201710899094 A CN 201710899094A CN 107666264 B CN107666264 B CN 107666264B
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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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- 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
- H02P7/00—Arrangements for regulating or controlling the speed or torque of electric DC motors
- H02P7/02—Arrangements for regulating or controlling the speed or torque of electric DC motors the DC motors being of the linear type
- H02P7/025—Arrangements for regulating or controlling the speed or torque of electric DC motors the DC motors being of the linear type the DC motors being of the moving coil type, e.g. voice coil motors
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Amplifiers (AREA)
- Control Of Linear Motors (AREA)
Abstract
The present invention provides a kind of driving circuit of voice coil motor comprising driving stage operational amplifier, switch K1, switch K2, imbalance detection and control circuit and imbalance adjustment control circuit.The first input end of driving stage operational amplifier is connected with input voltage by switch K1, is grounded by switch K2；Imbalance detection and control circuit include switch K3, switch K4, metal-oxide-semiconductor MN1, resistance Rs, with reference to constant-current source, current comparator and logic circuit, MN1 and resistance RS are sequentially connected between the first input end of current comparator and ground terminal, and the control terminal of MN1 connects driving stage operational amplifier output terminal through switch K3；Switch K4 is connected between the second input terminal of driving stage operational amplifier and the second connection end of MN1；It is connected between the second input terminal of current comparator and ground terminal with reference to constant-current source.The comparison result output calibration control signal that logic circuit is exported based on current comparator；Imbalance adjustment control circuit is based on calibration control signal output current and controls signal, to carry out mistuning calibration function to driving operational amplifier.
Description
[technical field]
The present invention relates to IC design technical field, in particular to a kind of driving circuit of voice coil motor.
[background technique]
Voice coil motor (VCM) driving circuit that consumer handheld device and portable electronic product use is mostly DAC (number
Mould conversion) product.High-end sensitive VCM requires its DAC driving circuit high resolution, and output offset current is small, therefore related drive
The offset voltage of the out drive stage of dynamic circuit requires very little.Though wave chopping technology can reduce offset voltage very well, make
Switching noise can be additionally introduced used in the occasion, most of designs use fuse or EEROM (Electrically at present
Erasable Read-Only Memory) etc. trim (Trimming) scheme, however, the Adjusted Options such as fuse will increase exploitation
Testing cost.
Therefore, it is necessary to provide a kind of driving circuit of improved voice coil motor.
[summary of the invention]
The purpose of the present invention is to provide a kind of driving circuits of voice coil motor, can adaptively reduce driving stage fortune
Calculate the input offset voltage of amplifier.
To solve the above-mentioned problems, the present invention provides a kind of driving circuit of voice coil motor comprising driving stage operation is put
Big device, switch K1, switch K2, imbalance detection and control circuit and imbalance adjustment control circuit.The driving stage operational amplifier
First input end be connected with input voltage by switch K1, and the first input end of the driving stage operational amplifier passes through
Switch K2 ground connection；Imbalance detection and control circuit include switch K3, switch K4, metal-oxide-semiconductor MN1, resistance Rs, with reference to constant current
Source, current comparator and logic circuit, wherein the first input end phase of the first connecting pin of metal-oxide-semiconductor MN1 and current comparator
Even, second connection end is grounded through resistance RS, and control terminal connects the output end of the driving stage operational amplifier through switch K3；
One end of switch K4 is connected with the second input terminal of the driving stage operational amplifier, the other end and metal-oxide-semiconductor MN1 and resistance
Connecting node between Rs is connected；It is connected with reference to the input terminal of constant-current source with the second input terminal of the current comparator, it is defeated
Outlet ground connection, the current comparator are used to be compared the electric current of its first input end and the electric current of the second input terminal, and
Comparison result is exported by its output end to logic circuit；The logic circuit the first control of result output based on the comparison
Signal processed and second control signal；Result also exports calibration control signal to tune of lacking of proper care to the logic circuit based on the comparison
Whole control circuit；The imbalance adjustment control circuit is based on calibration control signal output current control signal to the drive
Dynamic grade operational amplifier, to carry out mistuning calibration function to the driving operational amplifier.
Further, the driving stage operational amplifier includes a pair of of Differential Input to pipe, constant-current source I1 and current steer,
Wherein, Differential Input is metal-oxide-semiconductor MP1 and MP2, the first connecting pin of metal-oxide-semiconductor MP1 and the first connecting pin of metal-oxide-semiconductor MP2 to pipe
It is connected with voltage source, the control terminal of metal-oxide-semiconductor MP1 and the control terminal of MOS pipe MP2 are respectively as the driving stage operational amplifier
First input end and the second input terminal；The input terminal of constant-current source I1 is connected with the voltage source, output end and metal-oxide-semiconductor MP2
Second connection end be connected；Current steer is connected between the voltage source VDD and the second connection end of metal-oxide-semiconductor MP1, current steer
Control terminal receive it is described imbalance adjustment control circuit output current controling signal, with control current steer output adjustable current,
The imbalance adjustment control circuit gives the control of the current steer based on the calibration control signal output current control signal
End, to be gradually increased the electric current of the current steer in electric current of the electric current of first input end greater than the second input terminal, until
Electric current of the electric current of first input end less than the second input terminal.
Further, the driving circuit of the voice coil motor further includes output driving circuit, the output driving circuit packet
Include metal-oxide-semiconductor MN2, resistance Rsense, switch K5 and K6, wherein the first connecting pin of metal-oxide-semiconductor MN2 and output driving circuit it is defeated
Outlet is connected, and second connection end is grounded through resistance Rsense, and control terminal is defeated through switch K5 and driving stage operational amplifier
Outlet is connected；One end of switch K6 is connected with the second input terminal of driving stage operational amplifier, the other end and metal-oxide-semiconductor MN2 and
Connecting node between resistance Rsense is connected, the first control signal and switch K1, K5 and K6 of the logic circuit output
Control terminal is connected, with the on or off of control switch K1, K5 and K6；The second control signal of logic circuit output with
Switch K2, K3 are connected with the control terminal of K4, with the on or off of control switch K2, K3 and K4.
Further, the imbalance adjustment control circuit includes N-bit counter, when the calibration of logic circuit output
When control signal is the first logic level, starts the N-bit counter and start counting, the N digit counter works as top N
Count value is the current controling signal of the imbalance adjustment control circuit output；
When the calibration control signal of logic circuit output is the second logic level, make the N-bit counter
Stop counting, the imbalance adjustment control circuit latches the current count value of N-bit counter, to stablize the imbalance adjustment control
The current controling signal of circuit output processed, the current controling signal are N current controling signals, and the N is natural number.
Further, the first input end of the driving stage operational amplifier and the second input terminal are respectively homophase input
End and inverting input terminal；The first input end of the current comparator and the second input terminal are respectively non-inverting input terminal and reverse phase
Input terminal；Described metal-oxide-semiconductor MP1, MP2 are PMOS transistor, and the first connecting pin, second connection end and control terminal are respectively
Source electrode, the drain and gate of PMOS transistor；MOS the pipe MN1 and MN2 are NMOS transistor, the first connecting pin, second
Connecting pin and control terminal are respectively drain electrode, source electrode and the grid of NMOS transistor.
Further, after system power-on reset, switch K2, K3 and K4 is connected, and switch K1, K5 and K6 are turned off, driving
Grade operational amplifier starts adaptively to reduce offset voltage, if the electric current of the defeated input terminal of the current comparator first is greater than it
When the electric current of the second input terminal, the comparison result of the current comparator output is the first logic level, the logic circuit base
Corresponding first control signal and second control signal are exported in the comparison result, so that switch K2, K3 and K4 continue to lead
Logical, so that switch K1, K5 and K6 continue to turn off, and the logic circuit calibration that result exports based on this comparison controls signal
For the first logic level, started counting with starting the N-bit counter of the imbalance adjustment control circuit；The imbalance adjustment control
The N-bit counter of circuit processed starts counting work under high frequency clock caused by oscillator, and exports the current position N and count
Value, the N-bit counter work as the N position current control letter that top N count value is the imbalance adjustment control circuit output
Number；If the electric current of the defeated input terminal of the current comparator first is less than or equal to the electric current of its second input terminal, the electric current ratio
Comparison result compared with device output is the second logic level, the logic circuit corresponding first control of result output based on this comparison
Signal processed and second control signal, so that switch K2, K3 and K4 are turned off, so that switch K1, K5 and K6 conducting, and described patrol
Collecting the circuit calibration control signal that result exports based on this comparison is the second logic level, and the N-bit counter is stopped
It counts, the imbalance adjustment control circuit latches the current count value of N-bit counter, to stablize the imbalance adjustment control electricity
The position the N current controling signal of road output.
Further, the constant current I1 of the constant-current source I1 output and the adjustable current I2 of current steer output distinguish table
It is shown as:
I1=2N-1×Iresolution
I2=m × Iresolvtion
Wherein, N is the control digit of current steering DAC；
M value is 0~(2N- 1) opposite with the decimal number of the position N current controling signal that current steer receives between
It answers；IresolutionControl electric current is differentiated for N the minimum of current steer.
Further, the driving stage operational amplifier further includes PMOS transistor MP3, MP4, MP5 and MP6, and
NMOS transistor MN3, MN4, MN5 and MN6.Wherein, the source electrode of PMOS transistor MP3 is connected with voltage source, PMOS transistor MP3
Drain electrode be connected with the source electrode of PMOS transistor MP5, the drain electrode and the drain electrode phase of NMOS transistor MN3 of PMOS transistor MP5
Even, the source electrode of NMOS transistor MN3 is connected with the drain electrode of NMOS transistor MN5, the source electrode ground connection of NMOS transistor MN5；
The source electrode of PMOS transistor MP4 is connected with voltage source VDD, the drain electrode of PMOS transistor MP4 and the source electrode of PMOS transistor MP6
It is connected, the drain electrode of PMOS transistor MP6 is connected with the output end of the driving stage operational amplifier, the leakage of NMOS transistor MN4
Pole is connected with the output end of the driving stage operational amplifier, the leakage of the source electrode and NMOS transistor MN6 of NMOS transistor MN4
Extremely it is connected, the source electrode ground connection of NMOS transistor MN6；The grid phase of the grid of PMOS transistor MP3 and PMOS transistor MP4
Even, and the grid of PMOS transistor MP3 is connected with the drain electrode of PMOS transistor MP5, the grid and PMOS of PMOS transistor MP5
The grid of transistor MP6 is connected with bias voltage Vbiasp；The grid of NMOS transistor MN3 and the grid of NMOS transistor MN4
Extremely be connected with bias voltage Vbiasn2, the grid of the grid of NMOS transistor MN5 and NMOS transistor MN6 with biasing
Voltage Vbiasn1 is connected.
Compared with prior art, the driving stage operational amplifier in the present invention is additionally arranged imbalance on the basis of traditional amplifier
The feedback control loop that detection and control circuit and imbalance adjustment control circuit are formed, so as to adaptively reduce driving stage operation
The input offset voltage of amplifier.
[Detailed description of the invention]
In order to illustrate the technical solution of the embodiments of the present invention more clearly, making required in being described below to embodiment
Attached drawing is briefly described, it should be apparent that, drawings in the following description are only some embodiments of the invention, right
For those of ordinary skill in the art, without any creative labor, it can also be obtained according to these attached drawings
Other attached drawings.Wherein:
Fig. 1 is the circuit diagram of the driving circuit of the voice coil motor of the present invention in one embodiment；
Fig. 2 is the circuit diagram of driving stage operational amplifier in one embodiment in Fig. 1.
[specific embodiment]
In order to make the foregoing objectives, features and advantages of the present invention clearer and more comprehensible, with reference to the accompanying drawing and specific real
Applying mode, the present invention is described in further detail.
" one embodiment " or " embodiment " referred to herein, which refers to, may be included at least one implementation of the invention
A particular feature, structure, or characteristic." in one embodiment " that different places occur in the present specification not refers both to same
A embodiment, nor the individual or selective embodiment mutually exclusive with other embodiments.Unless stated otherwise, originally
The word of connection, the expression electric connection for being connected, connecting in text indicates directly or indirectly to be electrical connected.
It please refers to shown in Fig. 1, for the circuit signal of the driving circuit of the voice coil motor of the present invention in one embodiment
Figure.The driving circuit of voice coil motor shown in FIG. 1 includes driving stage operational amplifier 110, switch K1, switch K2, imbalance detection
And control circuit 120, imbalance adjustment control circuit 130 and output driving circuit 140.
It please refers to shown in Fig. 2, is the circuit diagram of driving stage operational amplifier in one embodiment in Fig. 1,
The driving stage operational amplifier increases constant current I1 as shown in Figure 2 on the basis of traditional amplifier and by current steering DAC control
The adjustable current I2 of system.
Driving stage operational amplifier shown in Fig. 2 includes a pair of of Differential Input to pipe, constant-current source I5, constant-current source I1 and electricity
Flow rudder DAC, wherein Differential Input is MOS (Metal Oxide Semiconductor) pipe MP1 and MP2, constant-current source I5 to pipe
Input terminal be connected with voltage source VDD, the output end of constant-current source I5 and the first connecting pin of metal-oxide-semiconductor MP1 and metal-oxide-semiconductor MP2's
First connecting pin is connected, and the control terminal of metal-oxide-semiconductor MP1 and the control terminal of metal-oxide-semiconductor MP2 are respectively as the driving stage operation amplifier
The first input end of device and the second input terminal；The input terminal of constant-current source I1 is connected with the voltage source VDD, output end with
The second connection end of metal-oxide-semiconductor MP2 is connected；Current steering DAC is connected to the second connection end of the voltage source VDD and metal-oxide-semiconductor MP1
Between, the control terminal of current steering DAC receives the position the N current controling signal CON_N that the imbalance adjustment control circuit 130 exports,
To control current steering DAC output adjustable current I2.
In one embodiment, the adjustable current of the constant current I1 of the constant-current source I1 output and current steering DAC output
I2 is respectively as follows:
I1=2N-1×Iresolution
I2=m × Iresolution
Wherein, N is the control digit of current steering DAC；M value is 0~(2N- 1) it between, is received with current steering DAC
The position N current controling signal CON_N decimal number it is corresponding；IresolutionControl is differentiated for N the minimum of current steering DAC
Electric current.The position N the current controling signal CON_N, electric current I2 received according to the control terminal of current steering DAC can be in 0*
IresolutionTo 2N-1*IresolutionBetween adjust, such as gradually from 0*IresolutionIncrease to 2N-1*Iresolution。
In specific embodiment shown in Fig. 2, the driving stage operational amplifier further include PMOS transistor MP3, MP4,
MP5 and MP6 and NMOS transistor MN3, MN4, MN5 and MN6.Wherein, the source electrode of PMOS transistor MP3 and voltage source VDD
It is connected, the drain electrode of PMOS transistor MP3 is connected with the source electrode of PMOS transistor MP5, the drain electrode of PMOS transistor MP5 and NMOS
The drain electrode of transistor MN3 is connected, and the source electrode of NMOS transistor MN3 is connected with the drain electrode of NMOS transistor MN5, NMOS transistor
The source electrode of MN5 is grounded；The source electrode of PMOS transistor MP4 is connected with voltage source VDD, and the drain electrode of PMOS transistor MP4 and PMOS are brilliant
The source electrode of body pipe MP6 is connected, and the drain electrode of PMOS transistor MP6 is connected with the output end OUT of the driving stage operational amplifier,
The drain electrode of NMOS transistor MN4 is connected with the output end OUT of the driving stage operational amplifier, the source of NMOS transistor MN4
Pole is connected with the drain electrode of NMOS transistor MN6, the source electrode ground connection of NMOS transistor MN6；The grid of PMOS transistor MP3 with
The grid of PMOS transistor MP4 is connected, and the grid of PMOS transistor MP3 is connected with the drain electrode of PMOS transistor MP5, PMOS
The grid of transistor MP5 and the grid of PMOS transistor MP6 are connected with bias voltage Vbiasp；The grid of NMOS transistor MN3
The grid of pole and NMOS transistor MN4 are connected with bias voltage Vbiasn2, the grid and NMOS crystal of NMOS transistor MN5
The grid of pipe MN6 is connected with bias voltage Vbiasn1.
Continue to introduce the driving circuit of voice coil motor shown in FIG. 1 below.
The first input end of the driving stage operational amplifier 110 is connected by switch K1 with input voltage VIN, and institute
The first input end for stating driving stage operational amplifier 110 is grounded by switch K2.
Imbalance detection and control circuit 120 include switch K3, switch K4, metal-oxide-semiconductor MN1, resistance Rs, with reference to constant current
Source Iref, current comparator 122 and logic circuit 124.Wherein, the first connecting pin of metal-oxide-semiconductor MN1 and current comparator 122
First input end is connected, and second connection end is grounded through resistance RS, and control terminal connects the driving stage operation amplifier through switch K3
The output end OUT of device 110；One end of switch K4 is connected with the second input terminal of the driving stage operational amplifier 110, another
Connecting node between one end and metal-oxide-semiconductor MN1 and resistance Rs is connected；With reference to the input terminal and the electric current ratio of constant-current source Iref
The second input terminal compared with device 122 is connected, output end ground connection.The current comparator 122 is used for its first input end
The electric current of electric current and the second input terminal is compared, and comparison result ENH_ERROR is exported by its output end and gives logic electricity
Road 124.Result ENH_ERROR exports the control letter of first control signal S1 and second to the logic circuit 124 based on the comparison
Number S2, result ENH_ERROR also exports calibration control signal ENH_CNT to imbalance to the logic circuit 124 based on the comparison
Adjust control circuit 130.
The imbalance adjustment control circuit 130 is based on calibration control signal ENH_CNT and exports N current control letters
Number CON_N gives the control terminal of the current steering DAC, in the electric current of the first input end of the driving stage operational amplifier 110
Greater than the second input terminal electric current when, the electric current of the current steer is gradually increased, until the driving stage operational amplifier 110
First input end electric current less than the second input terminal electric current, to complete the imbalance of the driving stage operational amplifier 110
Calibration.In specific embodiment shown in Fig. 2, when the calibration control signal ENH_CNT of the logic circuit 124 output is the
When one logic level, start the N-bit counter and start counting, the top N count value of working as of the N-bit counter is institute
State the position the N current controling signal CON_N that imbalance adjustment control circuit 130 exports；When the calibration of the logic circuit 124 output
When control signal ENH_CNT is the second logic level, the N-bit counter is made to stop Counts, the imbalance adjustment
Control circuit 130 latches the current count value of N-bit counter, to stablize the position N that the imbalance adjustment control circuit 130 exports
Current controling signal CON_N.
The output driving circuit 140 includes metal-oxide-semiconductor MN2, resistance Rsense, switch K5 and K6, wherein metal-oxide-semiconductor MN2
The first connecting pin be connected with the output end IOUT of output driving circuit 140, second connection end is grounded through resistance Rsense,
Its control terminal is connected through switch K5 with the output end OUT of driving stage operational amplifier 110；One end of switch K6 and driving stage are transported
The second input terminal for calculating amplifier 110 is connected, the connecting node phase between the other end and metal-oxide-semiconductor MN2 and resistance Rsense
Even.
Wherein, the first control signal S1 that the logic circuit 124 exports is connected with the control terminal of switch K1, K5 and K6,
With the on or off of control switch K1, K5 and K6；The second control signal S2 of output and the control terminal of switch K2, K3 and K4
It is connected, with the on or off of control switch K2, K3 and K4.
In Fig. 1 and embodiment shown in Fig. 2, the first input end of the driving stage operational amplifier 110 and second defeated
Entering end is respectively its non-inverting input terminal and inverting input terminal；The first input end and the second input terminal of the current comparator 122
Respectively its non-inverting input terminal and inverting input terminal；Described metal-oxide-semiconductor MP1, MP2 are PMOS transistor, the first connecting pin, the
Two connecting pins and control terminal are respectively the source electrode of PMOS transistor, drain and gate；The metal-oxide-semiconductor MN1 and MN2 is NMOS brilliant
Body pipe, the first connecting pin, second connection end and control terminal are respectively drain electrode, source electrode and the grid of NMOS transistor.
Below in conjunction with Fig. 1 and Fig. 2, the specific driving circuit for introducing the voice coil motor in the present invention is adaptive to reduce driving
The course of work of the input offset voltage of grade operational amplifier.
After system power-on reset, for the working condition for establishing reliable low imbalance, switch K2, K3 and K4 is connected, and open
K1, K5 and K6 shutdown are closed, by driving stage operational amplifier 110, imbalance detection and control circuit 120, imbalance adjustment control circuit
130 form feedback loop, start the input offset voltage for adaptively reducing the driving stage operational amplifier 110.
It powers on just, the current value of constant current I1 and adjustable current I2 in Fig. 2 are respectively I1=2N-1×Iresolution,
And I2=m × Iresolution=0 × Iresolution=0, therefore, the initial offset voltage of the driving stage operational amplifier 110
Vos_initial exists certainly and greater than 0, may be defined as Vos_initial=Vp-Vn> 0, after Voltage to current transducer:
The electric current I3 of i.e. described 122 non-inverting input terminal of current comparator is greater than the electric current I4 of its inverting input terminal, electric current ratio
It is high level (its first patrolling of can be described as the comparison result ENH_ERROR compared with the comparison result ENH_ERROR that device 122 exports
Collect level)；Result ENH_ERROR (high level) exports corresponding first control signal to the logic circuit 124 based on this comparison
S1 and second control signal S2, so that switch K2, K3 and K4 continue to be connected, so that switch K1, K5 and K6 continue to turn off, and
The logic circuit 124 calibration control signal ENH_CNT that result ENH_ERROR (high level) is exported based on this comparison is height
Level (its first logic level that can be described as calibration control signal ENH_CNT), to start the imbalance adjustment control circuit
130 N-bit counter starts counting.
Then, N-bit counter high frequency clock caused by oscillator 150 of the imbalance adjustment control circuit 130
Work is started counting under CLOCK, and exports the current position N count value, and the N count value is the N current controling signal
CON_N, to adjust the adjustable current I2 of the output of the current steering DAC in the driving stage operational amplifier 110.
In Fig. 1,When,
When the electric current I3 of i.e. described 122 non-inverting input terminal of current comparator is less than or equal to the electric current I4 of its inverting input terminal,
System completes adaptive offset voltage and adjusts work.At this point, the comparison result ENH_ERROR that current comparator 122 exports is low
Level (its second logic level that can be described as the comparison result ENH_ERROR).The logic circuit 124 is based on this comparison
As a result ENH_ERROR (low level) exports corresponding first control signal S1 and second control signal S2, so that switch K2,
K3 and K4 turns off and latches the switch state, so that switch K1, K5 and K6 are connected and latch the switch state, and the logic
The calibration control signal ENH_CNT that result ENH_ERROR (low level) is exported based on this comparison of circuit 124 is low level (its
Can be described as the second logic level of calibration control signal ENH_CNT) so that the position N of the imbalance adjustment control circuit 130
Counter stops Counts, and the imbalance adjustment control circuit 130 latches current count value CON_N, to stablize the mistake
The whole control circuit 130 of tune exports N current controling signal CON_N, to stablize in the driving stage operational amplifier 110
Current steering DAC output adjustable current I2.
In Fig. 1, the imbalance precision Vos_min of the driving stage operational amplifier 110 be may be expressed as:
Vos_min=Vp-Vn=I2×Rs,
Wherein, I3 is the current value of 122 non-inverting input terminal of current comparator, and I4 is that the current comparator 122 is anti-
The current value of phase input terminal, Rs are the resistance value of resistance Rs, and Iref is the current value of reference current source Iref.
In conclusion the driving circuit of the voice coil motor in the present invention includes driving stage operational amplifier 110, imbalance inspection
It surveys and control circuit 120, imbalance adjusts control circuit 130 and output driving circuit 140.Wherein, driving stage operational amplifier
110 increase the adjustable current I2 of constant current I1 and current steering DAC output on the basis of traditional amplifier, and pass through imbalance inspection
It surveys and control circuit 120, imbalance adjustment control circuit 130 forms feedback control loop, to adjust the adjustable electric of current steering DAC output
I2 is flowed, to adaptively reduce the input offset voltage of driving stage operational amplifier.
Compared with prior art, the invention has the characteristics that:
1. can self-adaptive processing adapt to the deviations such as the technique between different chips；
2. imbalance detection circuit is simply easily realized, and offset voltage accurately controls；
3. wave chopping technology is compared, it can be to avoid switching noise；
4. can reduce Off-chip test cost compared to the outer fuse adjustment technology of piece.
In the present invention, the word that the expressions such as " connection ", connected, " company ", " connecing " are electrical connected, unless otherwise instructed, then
Indicate direct or indirect electric connection.
It should be pointed out that one skilled in the art any changes to what a specific embodiment of the invention was done
The dynamic range all without departing from claims of the present invention.Correspondingly, the scope of the claims of the invention also not merely office
It is limited to previous embodiment.
Claims (8)
1. a kind of driving circuit of voice coil motor, which is characterized in that it include driving stage operational amplifier, switch K1, switch K2,
Imbalance detection and control circuit and imbalance adjustment control circuit,
The first input end of the driving stage operational amplifier is connected by switch K1 with input voltage, and the driving stage operation
The first input end of amplifier is grounded by switch K2；
Imbalance detection and control circuit include switch K3, switch K4, metal-oxide-semiconductor MN1, resistance Rs, with reference to constant-current source, electric current ratio
Compared with device and logic circuit,
Wherein, the first connecting pin of metal-oxide-semiconductor MN1 is connected with the first input end of current comparator, and second connection end is through resistance
RS ground connection, control terminal connect the output end of the driving stage operational amplifier through switch K3；One end of switch K4 and the driving
Second input terminal of grade operational amplifier is connected, and the connecting node between the other end and metal-oxide-semiconductor MN1 and resistance Rs is connected；Ginseng
The input terminal for examining constant-current source is connected with the second input terminal of the current comparator, output end ground connection,
The current comparator will compare for being compared to the electric current of its first input end and the electric current of the second input terminal
As a result it is exported by its output end to logic circuit；The logic circuit based on the comparison result output first control signal and
Second control signal；Result also exports calibration control signal to adjustment control electricity of lacking of proper care to the logic circuit based on the comparison
Road；The imbalance adjustment control circuit is based on calibration control signal output current control signal and puts to the driving stage operation
Big device, to carry out mistuning calibration function to the driving operational amplifier,
The driving stage operational amplifier includes current steer,
The imbalance adjustment control circuit gives the control of the current steer based on the calibration control signal output current control signal
End processed, to be greater than the electric current of the second input terminal of the current comparator in the electric current of the first input end of the current comparator
When, it is gradually increased the electric current of the current steer, until the electric current of the first input end of the current comparator is less than the electric current
The electric current of second input terminal of comparator.
2. the driving circuit of voice coil motor according to claim 1, which is characterized in that
The driving stage operational amplifier further includes a pair of of Differential Input to pipe and constant-current source I1, wherein Differential Input is to pipe
Metal-oxide-semiconductor MP1 and MP2, the first connecting pin of metal-oxide-semiconductor MP1 and the first connecting pin of metal-oxide-semiconductor MP2 are connected with voltage source, metal-oxide-semiconductor MP1
Control terminal and metal-oxide-semiconductor MP2 control terminal respectively as the first input end of the driving stage operational amplifier and second input
End；The input terminal of constant-current source I1 is connected with the voltage source, and output end is connected with the second connection end of metal-oxide-semiconductor MP2；The electricity
Stream rudder is connected between the voltage source VDD and the second connection end of metal-oxide-semiconductor MP1, described in the control terminal reception of the current steer
The current controling signal of imbalance adjustment control circuit output, to control current steer output adjustable current.
3. the driving circuit of voice coil motor according to claim 2, which is characterized in that it further includes output driving circuit,
The output driving circuit includes metal-oxide-semiconductor MN2, resistance Rsense, switch K5 and K6, wherein the first of metal-oxide-semiconductor MN2 connects
It connects end to be connected with the output end of output driving circuit, second connection end is grounded through resistance Rsense, and control terminal is through switch K5
It is connected with the output end of driving stage operational amplifier；The second input terminal phase of one end of switch K6 and driving stage operational amplifier
Even, the connecting node between the other end and metal-oxide-semiconductor MN2 and resistance Rsense is connected,
The first control signal of the logic circuit output is connected with the control terminal of switch K1, K5 and K6, with control switch K1, K5
With the on or off of K6；
The second control signal of the logic circuit output is connected with the control terminal of switch K2, K3 and K4, with control switch K2, K3
With the on or off of K4.
4. the driving circuit of voice coil motor according to claim 3, which is characterized in that the imbalance adjusts control circuit packet
N-bit counter is included,
When the calibration control signal of logic circuit output is the first logic level, starts the N-bit counter and start
It counts, the N-bit counter works as the current controling signal that top N count value is the imbalance adjustment control circuit output；
When the calibration control signal of logic circuit output is the second logic level, the N-bit counter is stopped
It counts, the imbalance adjustment control circuit latches the current count value of N-bit counter, to stablize the imbalance adjustment control circuit
The current controling signal of output, the current controling signal are N current controling signals, and the N is natural number.
5. the driving circuit of voice coil motor according to claim 4, which is characterized in that
The first input end and the second input terminal of the driving stage operational amplifier are respectively non-inverting input terminal and inverting input terminal；
The first input end of the current comparator and the second input terminal are respectively non-inverting input terminal and inverting input terminal；
Described metal-oxide-semiconductor MP1, MP2 are PMOS transistor, and the first connecting pin, second connection end and control terminal are respectively PMOS crystalline substance
Source electrode, the drain and gate of body pipe；
The metal-oxide-semiconductor MN1 and MN2 is NMOS transistor, and the first connecting pin, second connection end and control terminal are respectively NMOS crystalline substance
Drain electrode, source electrode and the grid of body pipe.
6. according to the driving circuit of any voice coil motor of claim 2-5, which is characterized in that
After system power-on reset, switch K2, K3 and K4 is connected, and switch K1, K5 and K6 are turned off, driving stage operational amplifier is opened
It starts from adaptation and reduces offset voltage,
If the electric current of the defeated input terminal of the current comparator first is greater than the electric current of its second input terminal, the current comparator
The comparison result of output is the first logic level, and result exports corresponding first control signal to the logic circuit based on this comparison
And second control signal so that switch K1, K5 and K6 continue to turn off, and described is patrolled so that switch K2, K3 and K4 continue to be connected
The calibration control signal of volume circuit result output based on this comparison is the first logic level, electric to start the imbalance adjustment control
The N-bit counter on road starts counting；
The N-bit counter of the imbalance adjustment control circuit starts counting work under high frequency clock caused by oscillator, and
The current position N count value is exported, the top N count value of working as of the N-bit counter is the imbalance adjustment control circuit output
The position N current controling signal；
If the electric current of the defeated input terminal of the current comparator first is less than or equal to the electric current of its second input terminal, the electric current ratio
Comparison result compared with device output is the second logic level, the logic circuit corresponding first control of result output based on this comparison
Signal and second control signal, so that switch K2, K3 and K4 are turned off, so that switch K1, K5 and K6 are connected, and logic electricity
Roadbed is the second logic level in the calibration control signal that the comparison result exports, and the N-bit counter is made to stop counting,
The imbalance adjustment control circuit latches the current count value of N-bit counter, to stablize the imbalance adjustment control circuit output
The position N current controling signal.
7. the driving circuit of voice coil motor according to claim 2, which is characterized in that
The constant current I1 of the constant-current source I1 output and the adjustable current I2 of current steer output are respectively indicated are as follows:
I1=2N-1*Iresolution
I2=m*Iresolution
Wherein, N is the control digit of current steering DAC；
M value is 0~(2N- 1) corresponding with the decimal number of the position N current controling signal that current steer receives between；
IresolutionControl electric current is differentiated for N the minimum of current steer.
8. the driving circuit of voice coil motor according to claim 7, which is characterized in that
The driving stage operational amplifier further include PMOS transistor MP3, MP4, MP5 and MP6 and NMOS transistor MN3,
MN4, MN5 and MN6,
Wherein, the source electrode of PMOS transistor MP3 is connected with voltage source, and the drain electrode of PMOS transistor MP3 is with PMOS transistor MP5's
Source electrode be connected, the drain electrode of PMOS transistor MP5 is connected with the drain electrode of NMOS transistor MN3, the source electrode of NMOS transistor MN3 and
The drain electrode of NMOS transistor MN5 is connected, the source electrode ground connection of NMOS transistor MN5；The source electrode and voltage source of PMOS transistor MP4
VDD is connected, and the drain electrode of PMOS transistor MP4 is connected with the source electrode of PMOS transistor MP6, the drain electrode of PMOS transistor MP6 and institute
The output end for stating driving stage operational amplifier is connected, and draining for NMOS transistor MN4 is defeated with the driving stage operational amplifier
Outlet is connected, and the source electrode of NMOS transistor MN4 is connected with the drain electrode of NMOS transistor MN6, and the source electrode of NMOS transistor MN6 connects
Ground；The grid of PMOS transistor MP3 is connected with the grid of PMOS transistor MP4, and the grid of PMOS transistor MP3 and PMOS are brilliant
The drain electrode of body pipe MP5 is connected, the grid of the grid of PMOS transistor MP5 and PMOS transistor MP6 with bias voltage Vbiasp
It is connected；The grid of NMOS transistor MN3 and the grid of NMOS transistor MN4 are connected with bias voltage Vbiasn2, NMOS crystal
The grid of pipe MN5 and the grid of NMOS transistor MN6 are connected with bias voltage Vbiasn1.
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| CN112799460B (en) * | 2021-01-30 | 2022-03-29 | 珠海巨晟科技股份有限公司 | Comparison circuit with mismatch calibration function |
| CN115622451B (en) * | 2022-11-30 | 2023-03-31 | 基合半导体（宁波）有限公司 | Drive circuit, chip and electronic equipment |
| CN115864907B (en) * | 2023-02-14 | 2023-06-20 | 基合半导体（宁波）有限公司 | Control circuit, control method, chip, electronic device, and storage medium |
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| US8084969B2 (en) * | 2007-10-01 | 2011-12-27 | Allegro Microsystems, Inc. | Hall-effect based linear motor controller |
| CN101877570B (en) * | 2009-04-28 | 2013-02-13 | 普诚科技股份有限公司 | Driving circuit and driving method of voice coil motor |
| WO2013171998A1 (en) * | 2012-05-17 | 2013-11-21 | 旭化成エレクトロニクス株式会社 | Control device for linear motion device and control method for same |
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