CN107666264A - The drive circuit of voice coil motor - Google Patents

The drive circuit of voice coil motor Download PDF

Info

Publication number
CN107666264A
CN107666264A CN201710899094.4A CN201710899094A CN107666264A CN 107666264 A CN107666264 A CN 107666264A CN 201710899094 A CN201710899094 A CN 201710899094A CN 107666264 A CN107666264 A CN 107666264A
Authority
CN
China
Prior art keywords
current
input
output
operational amplifier
circuit
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CN201710899094.4A
Other languages
Chinese (zh)
Other versions
CN107666264B (en
Inventor
黄星星
袁广睿
陆浩
李静
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
WUXI CHIPOWN MICROELECTRONICS CO Ltd
Original Assignee
WUXI CHIPOWN MICROELECTRONICS CO Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by WUXI CHIPOWN MICROELECTRONICS CO Ltd filed Critical WUXI CHIPOWN MICROELECTRONICS CO Ltd
Priority to CN201710899094.4A priority Critical patent/CN107666264B/en
Publication of CN107666264A publication Critical patent/CN107666264A/en
Application granted granted Critical
Publication of CN107666264B publication Critical patent/CN107666264B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • 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
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Amplifiers (AREA)
  • Control Of Linear Motors (AREA)

Abstract

The present invention provides a kind of drive circuit of voice coil motor, and it includes 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 by switching K1 with input voltage, by switching 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, MN1 and resistance RS are sequentially connected between the first input end of current comparator and earth terminal, and MN1 control terminal connects driving stage operational amplifier output terminal through switching K3；Switch K4 is connected between the input of driving stage operational amplifier second and MN1 second connection end；It is connected to reference to constant-current source between the input of current comparator second and earth terminal.The comparative 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 control signal, to carry out mistuning calibration function to driving operational amplifier.

Description

The drive circuit of voice coil motor
【Technical field】
The present invention relates to IC design technical field, more particularly to a kind of drive circuit of voice coil motor.
【Background technology】
Consumer handheld device is mostly DAC (numbers with voice coil motor (VCM) drive circuit that portable type electronic product uses Mould is changed) product.High-end sensitive VCM requires its DAC drive 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 at present use fuse or EEROM (Electrically Erasable Read-Only Memory) etc. trim (Trimming) scheme, however, the Adjusted Option such as fuse can increase exploitation Testing cost.
Therefore, it is necessary to provide a kind of drive circuit of improved voice coil motor.
【The content of the invention】
It is an object of the invention to provide a kind of drive circuit of voice coil motor, and it can adaptively reduce driving stage fortune Calculate the input offset voltage of amplifier.
In order to solve the above problems, the present invention provides a kind of drive circuit of voice coil motor, and it includes driving stage computing and 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 by switching K1 with input voltage, and the first input end of the driving stage operational amplifier passes through Switch K2 ground connection；It is described 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, metal-oxide-semiconductor MN1 the first connection end and the first input end phase of current comparator Even, its second connection end is grounded through resistance RS, and its control terminal connects the output end of the driving stage operational amplifier through switching K3； Switch K4 one end is connected with the second input of the driving stage operational amplifier, its other end and metal-oxide-semiconductor MN1 and resistance Connecting node between Rs is connected；It is connected with reference to the input of constant-current source with the second input of the current comparator, its is defeated Going out end ground connection, the current comparator is used to be compared the electric current of its first input end and the electric current of the second input, and Comparative result is exported to logic circuit by its output end；The logic circuit is based on the control of comparative result output first Signal processed and the second control signal；The logic circuit also exports calibration control signal based on the comparative result and adjusted to imbalance Whole control circuit；The imbalance adjustment control circuit is based on the calibration control signal output current control signal and gives the drive Dynamic level operational amplifier, to carry out mistuning calibration function to the driving operational amplifier.
Further, the driving stage operational amplifier includes a pair of Differential Inputs to pipe, constant-current source I1 and current steer, Wherein, Differential Input is metal-oxide-semiconductor MP1 and MP2 to pipe, metal-oxide-semiconductor MP1 the first connection end and metal-oxide-semiconductor MP2 the first connection end It is connected with voltage source, metal-oxide-semiconductor MP1 control terminal and MOS pipes MP2 control terminal are respectively as the driving stage operational amplifier First input end and the second input；Constant-current source I1 input is connected with the voltage source, its output end and metal-oxide-semiconductor MP2 Second connection end be connected；Current steer is connected between the second connection end of the voltage source VDD and metal-oxide-semiconductor MP1, current steer Control terminal receive it is described imbalance adjustment control circuit output current controling signal, with control electric current rudder export 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, in electric current of the electric current of first input end more than the second input, gradually to increase the electric current of the current steer, until The electric current of first input end is less than the electric current of the second input.
Further, the drive circuit of the voice coil motor also includes output driving circuit, the output driving circuit bag Include metal-oxide-semiconductor MN2, resistance Rsense, switch K5 and K6, wherein, metal-oxide-semiconductor MN2 the first connection end and output driving circuit it is defeated Go out end to be connected, its second connection end is grounded through resistance Rsense, and its control terminal is through switching the defeated of K5 and driving stage operational amplifier Go out end to be connected；Switch K6 one end is connected with the second input of driving stage operational amplifier, its 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 controlling switch K1, K5 and K6 on or off；Second control signal of logic circuit output with Switch K2, K3 are connected with K4 control terminal, with controlling switch K2, K3 and K4 on or off.
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, it starts the N-bit counter and started counting up, and the N digit counters work 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, it causes 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 positions current controling signal, and the N is natural number.
Further, the first input end of the driving stage operational amplifier and the second input are respectively homophase input End and inverting input；The first input end of the current comparator and the second input are respectively in-phase input end and anti-phase Input；Described metal-oxide-semiconductor MP1, MP2 are PMOS transistor, and its first connection end, second connection end and control terminal are respectively Source electrode, the drain and gate of PMOS transistor；MOS the pipes MN1 and MN2 are nmos pass transistor, its first connection end, second Connection end and control terminal are respectively drain electrode, source electrode and the grid of nmos pass transistor.
Further, after system power-on reset, switch K2, K3 and K4 are turned on, and switchs K1, K5 and K6 shut-off, driving Level operational amplifier starts adaptively to reduce offset voltage, if the electric current of the first defeated input of the current comparator is more than it During the electric current of the second input, the comparative result of current comparator output is the first logic level, the logic circuit base Corresponding first control signal and the second control signal are exported in the comparative result, continues to lead to switch K2, K3 and K4 It is logical so that switch K1, K5 and K6 continue to turn off, and the calibration control signal that the logic circuit is exported based on the comparative result For the first logic level, the N-bit counter for adjusting control circuit to start the imbalance starts counting up；The imbalance adjustment control The N-bit counter of circuit processed starts counting up work under high frequency clock caused by oscillator, and exports current N positions and count Value, the N-bit counter work as the N positions current control letter that top N count value is the imbalance adjustment control circuit output Number；If the electric current of the first defeated input of current comparator is less than or equal to the electric current of its second input, the electric current ratio Comparative result compared with device output is the second logic level, and the logic circuit is based on corresponding first control of comparative result output Signal processed and the second control signal, to switch K2, K3 and K4 shut-off so that switch K1, K5 and K6 conducting, and described patrol It is the second logic level that circuit, which is collected, based on the calibration control signal that the comparative result exports, and it causes the N-bit counter to stop Count, the imbalance adjustment control circuit latches the current count value of N-bit counter, to stablize the imbalance adjustment control electricity The N positions current controling signal of road output.
Further, the constant current I1 of the constant-current source I1 outputs and the adjustable current I2 difference tables of current steer output It is shown as：
I1=2N-1×Iresolution
I2=m × Iresolvtion
Wherein, N is the control digit of current steering DAC；
M values are 0~(2N- 1) between, it is relative with the decimal number for the N positions current controling signal that current steer receives Should；IresolutionMinimum for N positions current steer differentiates control electric current.
Further, the driving stage operational amplifier also includes PMOS transistor MP3, MP4, MP5 and MP6, and Nmos pass transistor MN3, MN4, MN5 and MN6.Wherein, PMOS transistor MP3 source electrode is connected with voltage source, PMOS transistor MP3 Drain electrode be connected with PMOS transistor MP5 source electrode, PMOS transistor MP5 drain electrode and nmos pass transistor MN3 drain electrode phase Even, NMOS transistors MN3 source electrode is connected with nmos pass transistor MN5 drain electrode, nmos pass transistor MN5 source ground； PMOS transistor MP4 source electrode is connected with voltage source VDD, PMOS transistor MP4 drain electrode and PMOS transistor MP6 source electrode It is connected, PMOS transistor MP6 drain electrode is connected with the output end of the driving stage operational amplifier, nmos pass transistor MN4 leakage Pole is connected with the output end of the driving stage operational amplifier, nmos pass transistor MN4 source electrode and nmos pass transistor MN6 leakage Extremely it is connected, nmos pass transistor MN6 source ground；The grid phase of PMOS transistor MP3 grid and PMOS transistor MP4 Even, and PMOS transistor MP3 grid is connected with PMOS transistor MP5 drain electrode, PMOS transistor MP5 grid and PMOS Transistor MP6 grid is connected with bias voltage Vbiasp；Nmos pass transistor MN3 grid and nmos pass transistor MN4 grid Extremely be connected with bias voltage Vbiasn2, nmos pass transistor MN5 grid and nmos pass transistor MN6 grid 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 computing The input offset voltage of amplifier.
【Brief description of the drawings】
In order to illustrate the technical solution of the embodiments of the present invention more clearly, make required in being described below to embodiment Accompanying drawing is briefly described, it should be apparent that, drawings in the following description are only some embodiments of the present invention, right For those of ordinary skill in the art, without having to pay creative labor, it can also be obtained according to these accompanying drawings Other accompanying drawings.Wherein：
Fig. 1 is the circuit diagram of the drive 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.
【Embodiment】
In order to facilitate the understanding of the purposes, features and advantages of the present invention, it is below in conjunction with the accompanying drawings and specific real Applying mode, the present invention is further detailed explanation.
" one embodiment " or " embodiment " referred to herein refers to may be included at least one implementation of the present invention Special characteristic, structure or characteristic." in one embodiment " that different places occur in this manual not refers both to same Individual embodiment, nor the single or selective embodiment mutually exclusive with other embodiment.Unless stated otherwise, originally The word that the expression connect, be connected, connecting in text is electrically connected with represents directly or indirectly to be electrical connected.
It refer to shown in Fig. 1, the circuit signal of the drive circuit of its voice coil motor for the present invention in one embodiment Figure.The drive 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.
Refer to shown in Fig. 2, it is the circuit diagram of driving stage operational amplifier in one embodiment in Fig. 1, The driving stage operational amplifier adds 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 Differential Inputs to pipe, constant-current source I5, constant-current source I1 and electricity Rudder DAC is flowed, wherein, Differential Input is MOS (Metal Oxide Semiconductor) pipes MP1 and MP2, constant-current source I5 to pipe Input be connected with voltage source VDD, constant-current source I5 output end and metal-oxide-semiconductor MP1 the first connection end and metal-oxide-semiconductor MP2's First connection end is connected, and metal-oxide-semiconductor MP1 control terminal and metal-oxide-semiconductor MP2 control terminal are respectively as the driving stage operation amplifier The first input end of device and the second input；Constant-current source I1 input is connected with the voltage source VDD, its output end with Metal-oxide-semiconductor MP2 second connection end 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 N positions current controling signal CON_N that the imbalance adjustment control circuit 130 exports, With control electric current rudder DAC output adjustable currents I2.
In one embodiment, the constant current I1 of the constant-current source I1 outputs and the adjustable current of current steering DAC output I2 is respectively：
I1=2N-1×Iresolution
I2=m × Iresolution
Wherein, N is the control digit of current steering DAC；M values are 0~(2N- 1) between, it is received with current steering DAC N positions current controling signal CON_N decimal number it is corresponding；IresolutionMinimum for N positions current steering DAC differentiates control Electric current.The N positions current controling signal CON_N received according to the control terminal of current steering DAC, its electric current I2 can be in 0* IresolutionTo 2N-1*IresolutionBetween adjust, such as gradually from 0*IresolutionIncrease to 2N-1*Iresolution。
In the specific embodiment shown in Fig. 2, the driving stage operational amplifier also include PMOS transistor MP3, MP4, MP5 and MP6, and nmos pass transistor MN3, MN4, MN5 and MN6.Wherein, PMOS transistor MP3 source electrode and voltage source VDD It is connected, PMOS transistor MP3 drain electrode is connected with PMOS transistor MP5 source electrode, PMOS transistor MP5 drain electrode and NMOS Transistor MN3 drain electrode is connected, and nmos pass transistor MN3 source electrode is connected with nmos pass transistor MN5 drain electrode, nmos pass transistor MN5 source ground；PMOS transistor MP4 source electrode is connected with voltage source VDD, and PMOS transistor MP4 drain electrode and PMOS are brilliant Body pipe MP6 source electrode is connected, and PMOS transistor MP6 drain electrode is connected with the output end OUT of the driving stage operational amplifier, Nmos pass transistor MN4 drain electrode is connected with the output end OUT of the driving stage operational amplifier, nmos pass transistor MN4 source Pole is connected with nmos pass transistor MN6 drain electrode, nmos pass transistor MN6 source ground；PMOS transistor MP3 grid with PMOS transistor MP4 grid is connected, and PMOS transistor MP3 grid is connected with PMOS transistor MP5 drain electrode, PMOS Transistor MP5 grid and PMOS transistor MP6 grid are connected with bias voltage Vbiasp；Nmos pass transistor MN3 grid Pole and nmos pass transistor MN4 grid are connected with bias voltage Vbiasn2, nmos pass transistor MN5 grid and NMOS crystal Pipe MN6 grid is connected with bias voltage Vbiasn1.
Continue to introduce the drive circuit of the voice coil motor shown in Fig. 1 below.
The first input end of the driving stage operational amplifier 110 is connected by switching K1 with input voltage VIN, and institute The first input end of driving stage operational amplifier 110 is stated by switching K2 ground connection.
It is described 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, metal-oxide-semiconductor MN1 the first connection end and current comparator 122 First input end is connected, and its second connection end is grounded through resistance RS, and its control terminal connects the driving stage operation amplifier through switching K3 The output end OUT of device 110；Switch K4 one end is connected with the second input of the driving stage operational amplifier 110, and its is another Connecting node between one end and metal-oxide-semiconductor MN1 and resistance Rs is connected；Input and the electric current ratio with reference to constant-current source Iref The second input compared with device 122 is connected, its output head grounding.The current comparator 122 is used for its first input end The electric current of electric current and the second input is compared, and comparative result ENH_ERROR is exported by its output end and gives logic electricity Road 124.The logic circuit 124 is based on the comparative result ENH_ERROR and exports the control letters of the first control signal S1 and second Number S2, the logic circuit 124 also export calibration control signal ENH_CNT to imbalance based on the comparative result ENH_ERROR Adjust control circuit 130.
The imbalance adjustment control circuit 130 is based on calibration control signal ENH_CNT output N positions current control letter Number CON_N gives the control terminal of the current steering DAC, with the electric current of the first input end of the driving stage operational amplifier 110 More than the second input electric current when, gradually increase the electric current of the current steer, until the driving stage operational amplifier 110 First input end electric current be less than the second input electric current, so as to complete the imbalance of the driving stage operational amplifier 110 Calibration.In the specific embodiment shown in Fig. 2, when the calibration control signal ENH_CNT of the logic circuit 124 output is the During one logic level, it starts described N-bit counter and started counting up, the N-bit counter when top N count value is institute State the N positions 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, it causes the N-bit counter to stop Counts, the imbalance adjustment Control circuit 130 latches the current count value of N-bit counter, to stablize the N positions 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 connection end be connected with the output end IOUT of output driving circuit 140, its second connection end through resistance Rsense be grounded, Its control terminal is connected through switching K5 with the output end OUT of driving stage operational amplifier 110；The one end and driving stage for switching K6 are transported The second input for calculating amplifier 110 is connected, the connecting node phase between its 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 switching K1, K5 and K6 control terminal, With controlling switch K1, K5 and K6 on or off；Second control signal S2 of output and switch K2, K3 and K4 control terminal It is connected, with controlling switch K2, K3 and K4 on or off.
In the embodiment shown in Fig. 1 and Fig. 2, the first input end of the driving stage operational amplifier 110 and second defeated It is respectively its in-phase input end and inverting input to enter end；The first input end and the second input of the current comparator 122 Respectively its in-phase input end and inverting input；Described metal-oxide-semiconductor MP1, MP2 are PMOS transistor, its first connection end, Two connection ends 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, its first connection end, second connection end and control terminal are respectively drain electrode, source electrode and the grid of nmos pass transistor.
Below in conjunction with Fig. 1 and Fig. 2, the specific drive 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 level operational amplifier.
After system power-on reset, to establish the working condition of reliable low imbalance, turn on switch K2, K3 and K4, and open K1, K5 and K6 shut-off are closed, by driving stage operational amplifier 110, imbalance detection and control circuit 120, imbalance adjustment control circuit 130 form backfeed loop, start adaptively to reduce the input offset voltage of the driving stage operational amplifier 110.
Just, the current value of constant current I1 and adjustable current I2 in Fig. 2 are respectively I to upper electricity1=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 and more than 0, may be defined as V certainlyos_initial=Vp-Vn＞ 0, after Voltage to current transducer：
The electric current I3 of the i.e. described in-phase input end of current comparator 122 is more than the electric current I4 of its inverting input, electric current ratio It is high level (its first patrolling of can be described as the comparative result ENH_ERROR compared with the comparative result ENH_ERROR that device 122 exports Collect level)；The logic circuit 124 is based on comparative result ENH_ERROR (high level) and exports corresponding first control signal S1 and the second control signal S2, continuing to turn on to switch K2, K3 and K4 so that switch K1, K5 and K6 continue to turn off, and The calibration control signal ENH_CNT that the logic circuit 124 is based on comparative result ENH_ERROR (high level) outputs is height Level (it can be described as the first logic level for calibrating control signal ENH_CNT), to start the imbalance adjustment control circuit 130 N-bit counter starts counting up.
Then, the N-bit counter of the imbalance adjustment control circuit 130 is in high frequency clock caused by oscillator 150 Work is started counting up under CLOCK, and exports current N positions count value, the N positions count value is N positions 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.
When in Fig. 1,When,
When the electric current I3 of the i.e. described in-phase input end of current comparator 122 is less than or equal to the electric current I4 of its inverting input, System completes adaptive offset voltage adjustment work.Now, the comparative result ENH_ERROR that current comparator 122 exports is low Level (it can be described as the second logic level of the comparative result ENH_ERROR).The logic circuit 124 is compared based on this As a result ENH_ERROR (low level) exports corresponding first control signal S1 and the second control signal S2, with to switch K2, K3 and K4 is turned off and is latched the on off state so that switch K1, K5 and K6 are turned on and latched the on off state, and the logic The calibration control signal ENH_CNT that circuit 124 is based on comparative result ENH_ERROR (low level) outputs is low level (its Can be described as calibrating control signal ENH_CNT the second logic level), to cause the imbalance to adjust the N positions of 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 key exports N position current controling signal CON_N, so as 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 is represented by：
Vos_min=Vp-Vn=I2×Rs,
Wherein, I3 is the current value of the in-phase input end of current comparator 122, and I4 is that the current comparator 122 is anti- The current value of phase input, Rs are resistance Rs resistance value, and Iref is reference current source Iref current value.
In summary, the drive circuit of the voice coil motor in the present invention includes driving stage operational amplifier 110, imbalance inspection Survey and control circuit 120, imbalance adjust control circuit 130 and output driving circuit 140.Wherein, driving stage operational amplifier 110 add the adjustable current I2 of constant current I1 and current steering DAC output on the basis of traditional amplifier, and are examined by lacking of proper care Survey and control circuit 120, imbalance adjustment control circuit 130 form feedback control loop, to adjust the adjustable electric of current steering DAC output I2 is flowed, so as 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. comparing wave chopping technology, switching noise can be avoided；
4. compared to the outer fuse adjustment technology of piece, Off-chip test cost can be reduced.
In the present invention, the word that the expression such as " connection ", connected, " company ", " connecing " is electrical connected, unless otherwise instructed, then Represent direct or indirect electric connection.
It is pointed out that one skilled in the art any changes to what the embodiment of the present invention was done The dynamic scope all without departing from claims of the present invention.Correspondingly, the scope of claim of the invention also not merely office It is limited to previous embodiment.

Claims (8)

  1. A kind of 1. drive circuit of voice coil motor, it is characterised 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 switching K1 with input voltage, and the driving stage computing The first input end of amplifier is by switching K2 ground connection；
    It is described 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, metal-oxide-semiconductor MN1 the first connection end is connected with the first input end of current comparator, and its second connection end is through resistance RS is grounded, and its control terminal connects the output end of the driving stage operational amplifier through switching K3；Switch K4 one end and the driving Second input of level operational amplifier is connected, and the connecting node between its other end and metal-oxide-semiconductor MN1 and resistance Rs is connected；Ginseng Examine the input of constant-current source with the second input of the current comparator to be connected, its output head grounding,
    The current comparator is used to be compared the electric current of its first input end and the electric current of the second input, and will compare As a result exported by its output end to logic circuit；The logic circuit be based on the comparative result export the first control signal and Second control signal；The logic circuit also exports calibration control signal based on the comparative result and gives imbalance adjustment control electricity Road；The imbalance adjustment control circuit is based on the calibration control signal output current control signal and put to the driving stage computing Big device, to carry out mistuning calibration function to the driving operational amplifier.
  2. 2. the drive circuit of voice coil motor according to claim 1, it is characterised in that
    The driving stage operational amplifier includes a pair of Differential Inputs to pipe, constant-current source I1 and current steer, wherein, Differential Input pair Manage and be connected for metal-oxide-semiconductor MP1 and MP2, metal-oxide-semiconductor MP1 the first connection end and metal-oxide-semiconductor MP2 the first connection end with voltage source, MOS The first input end and second of pipe MP1 control terminal and metal-oxide-semiconductor MP2 control terminal respectively as the driving stage operational amplifier Input；Constant-current source I1 input is connected with the voltage source, and its output end is connected with metal-oxide-semiconductor MP2 second connection end；Electricity Stream rudder is connected between the second connection end of the voltage source VDD and metal-oxide-semiconductor MP1, and the control terminal of current steer receives the imbalance The current controling signal of control circuit output is adjusted, adjustable current is exported with control electric current rudder,
    The imbalance adjustment control circuit gives the control of the current steer based on the calibration control signal output current control signal End processed, in electric current of the electric current of first input end more than the second input, gradually to increase the electric current of the current steer, until The electric current of first input end is less than the electric current of the second input.
  3. 3. the drive circuit of voice coil motor according to claim 2, it is characterised in that it also 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 Connect end with the output end of output driving circuit to be connected, its second connection end is grounded through resistance Rsense, and its control terminal is through switching K5 It is connected with the output end of driving stage operational amplifier；Switch K6 one end and the second input phase of driving stage operational amplifier Even, the connecting node between its other end and metal-oxide-semiconductor MN2 and resistance Rsense is connected,
    First control signal of the logic circuit output is connected with switching K1, K5 and K6 control terminal, with controlling switch K1, K5 With K6 on or off；
    Second control signal of the logic circuit output is connected with switching K2, K3 and K4 control terminal, with controlling switch K2, K3 With K4 on or off.
  4. 4. the drive circuit of voice coil motor according to claim 3, it is characterised in that the imbalance adjustment control circuit bag Include N-bit counter,
    When the calibration control signal of logic circuit output is the first logic level, it starts the N-bit counter and started Count, 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, it causes the N-bit counter to stop Count, 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 positions current controling signal, and the N is natural number.
  5. 5. the drive circuit of voice coil motor according to claim 4, it is characterised in that
    The first input end and the second input of the driving stage operational amplifier are respectively in-phase input end and inverting input；
    The first input end of the current comparator and the second input are respectively in-phase input end and inverting input；
    Described metal-oxide-semiconductor MP1, MP2 are PMOS transistor, and its first connection end, second connection end and control terminal are respectively PMOS crystalline substances Source electrode, the drain and gate of body pipe；
    The metal-oxide-semiconductor MN1 and MN2 is nmos pass transistor, and its first connection end, second connection end and control terminal are respectively NMOS crystalline substances Drain electrode, source electrode and the grid of body pipe.
  6. 6. according to the drive circuit of any described voice coil motors of claim 2-5, it is characterised in that
    After system power-on reset, switch K2, K3 and K4 are turned on, and switch K1, K5 and K6 shut-off, driving stage operational amplifier is opened Start from adaptation and reduce offset voltage,
    If the electric current of the first defeated input of current comparator is more than the electric current of its second input, the current comparator The comparative result of output is the first logic level, and the logic circuit is based on the comparative result and exports corresponding first control signal With the second control signal, continue to turn on to switch K2, K3 and K4 so that switch K1, K5 and K6 continue to turn off, and described patrol It is the first logic level that circuit, which is collected, based on the calibration control signal that the comparative result exports, to start the imbalance adjustment control electricity The N-bit counter on road starts counting up；
    The N-bit counter of the imbalance adjustment control circuit starts counting up work under high frequency clock caused by oscillator, and Export current N positions count value, the N-bit counter when top N count value is the imbalance adjustment control circuit output N positions current controling signal；
    If the electric current of the first defeated input of current comparator is less than or equal to the electric current of its second input, the electric current ratio Comparative result compared with device output is the second logic level, and the logic circuit is based on corresponding first control of comparative result output Signal and the second control signal, to switch K2, K3 and K4 shut-off so that switch K1, K5 and K6 conducting, and logic electricity Roadbed is the second logic level in the calibration control signal that the comparative result exports, and it causes the N-bit counter 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 N positions current controling signal.
  7. 7. the drive circuit of voice coil motor according to claim 2, it is characterised in that
    The constant current I1 of the constant-current source I1 outputs and the adjustable current I2 of current steer output are expressed as：
    I1=2N-1×Iresolution
    I2=m × Iresolution
    Wherein, N is the control digit of current steering DAC；
    M values are 0~(2N- 1) between, it is corresponding with the decimal number for the N positions current controling signal that current steer receives； IresolutionMinimum for N positions current steer differentiates control electric current.
  8. 8. the drive circuit of voice coil motor according to claim 7, it is characterised in that
    The driving stage operational amplifier also includes PMOS transistor MP3, MP4, MP5 and MP6, and nmos pass transistor MN3, MN4, MN5 and MN6,
    Wherein, PMOS transistor MP3 source electrode is connected with voltage source, and PMOS transistor MP3 drain electrode is with PMOS transistor MP5's Source electrode is connected, and PMOS transistor MP5 drain electrode is connected with nmos pass transistor MN3 drain electrode, nmos pass transistor MN3 source electrode with Nmos pass transistor MN5 drain electrode is connected, nmos pass transistor MN5 source ground；PMOS transistor MP4 source electrode and voltage source VDD is connected, and PMOS transistor MP4 drain electrode is connected with PMOS transistor MP6 source electrode, PMOS transistor MP6 drain electrode and institute The output end for stating driving stage operational amplifier is connected, and draining for nmos pass transistor MN4 is defeated with the driving stage operational amplifier Go out end to be connected, nmos pass transistor MN4 source electrode is connected with nmos pass transistor MN6 drain electrode, and nmos pass transistor MN6 source electrode connects Ground；PMOS transistor MP3 grid is connected with PMOS transistor MP4 grid, and PMOS transistor MP3 grid and PMOS are brilliant Body pipe MP5 drain electrode is connected, PMOS transistor MP5 grid and PMOS transistor MP6 grid with bias voltage Vbiasp It is connected；Nmos pass transistor MN3 grid and nmos pass transistor MN4 grid are connected with bias voltage Vbiasn2, NMOS crystal Pipe MN5 grid and nmos pass transistor MN6 grid are connected with bias voltage Vbiasn1.
CN201710899094.4A 2017-09-28 2017-09-28 The driving circuit of voice coil motor Active CN107666264B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201710899094.4A CN107666264B (en) 2017-09-28 2017-09-28 The driving circuit of voice coil motor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201710899094.4A CN107666264B (en) 2017-09-28 2017-09-28 The driving circuit of voice coil motor

Publications (2)

Publication Number Publication Date
CN107666264A true CN107666264A (en) 2018-02-06
CN107666264B CN107666264B (en) 2019-07-12

Family

ID=61097542

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201710899094.4A Active CN107666264B (en) 2017-09-28 2017-09-28 The driving circuit of voice coil motor

Country Status (1)

Country Link
CN (1) CN107666264B (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112799460A (en) * 2021-01-30 2021-05-14 珠海巨晟科技股份有限公司 Comparison circuit with mismatch calibration function
CN115622451A (en) * 2022-11-30 2023-01-17 基合半导体（宁波）有限公司 Drive circuit, chip and electronic equipment
CN115864907A (en) * 2023-02-14 2023-03-28 基合半导体（宁波）有限公司 Control circuit, method, chip, electronic device, and storage medium

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101378240A (en) * 2007-08-29 2009-03-04 三洋电机株式会社 Motor driving circuit
CN101877570A (en) * 2009-04-28 2010-11-03 普诚科技股份有限公司 Driving circuit of voice coil motor and driving method
US8084969B2 (en) * 2007-10-01 2011-12-27 Allegro Microsystems, Inc. Hall-effect based linear motor controller
CN104272160A (en) * 2012-05-17 2015-01-07 旭化成微电子株式会社 Control device for linear motion device and control method for same

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101378240A (en) * 2007-08-29 2009-03-04 三洋电机株式会社 Motor driving circuit
US8084969B2 (en) * 2007-10-01 2011-12-27 Allegro Microsystems, Inc. Hall-effect based linear motor controller
CN101877570A (en) * 2009-04-28 2010-11-03 普诚科技股份有限公司 Driving circuit of voice coil motor and driving method
CN104272160A (en) * 2012-05-17 2015-01-07 旭化成微电子株式会社 Control device for linear motion device and control method for same

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112799460A (en) * 2021-01-30 2021-05-14 珠海巨晟科技股份有限公司 Comparison circuit with mismatch calibration function
CN115622451A (en) * 2022-11-30 2023-01-17 基合半导体（宁波）有限公司 Drive circuit, chip and electronic equipment
CN115864907A (en) * 2023-02-14 2023-03-28 基合半导体（宁波）有限公司 Control circuit, method, chip, electronic device, and storage medium

Also Published As

Publication number Publication date
CN107666264B (en) 2019-07-12

Similar Documents

Publication Publication Date Title
US7889014B1 (en) Ring based impedance control of an output driver
CN107666264A (en) The drive circuit of voice coil motor
US7902894B2 (en) Accurate hysteretic comparator and method
US9780785B2 (en) Calibration circuit for on-chip drive and on-die termination
US6927600B2 (en) Resistance calibration circuit in semiconductor device
US8030972B2 (en) High-speed latched comparator circuit with variable positive feedback
CN107085132A (en) A kind of positive voltage power under high-precision detection of negative pressure circuit
KR20070033255A (en) Fuse trimming circuit
CN106656081B (en) A kind of circuit for eliminating operational amplifier offset voltage
CN107395162A (en) Clamp circuit and the method for clamping voltage
US9941852B1 (en) Operation amplifiers with offset cancellation
CN106788354A (en) A kind of programmable hysteresis comparator of sluggish width
CN112865763A (en) Comparator with a comparator circuit
US20130120046A1 (en) Analog rail-to-rail comparator with hysteresis
CN104935321B (en) Input and output impedance calibration circuit and method
CN210578470U (en) Comparator with a comparator circuit
CN110635790B (en) Voltage type hysteresis comparator
CN104539251A (en) Low-noise low-voltage differential signal transmitter
US8344779B2 (en) Comparator circuit with hysteresis, test circuit, and method for testing
CN107479620B (en) A kind of square rootkey transconductance circuit
JP4887640B2 (en) Analog differential circuit test equipment
EP2124336B1 (en) High-speed latched comparator circuit
US20230111161A1 (en) Multi-protocol analog front end circuit
CN210693996U (en) Envelope detection circuit
JPS6331210A (en) Schmitt trigger circuit

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant