KR20220043426A - Apparatus for controlling current driving circuit and Apparatus for driving voice coil motor - Google Patents

Abstract

An apparatus for controlling a current drive circuit according to an embodiment of the present invention comprises a control circuit configured to form a dominant current in a control circuit according to an input control signal based on a current-mirror structure of multiple semiconductor circuit elements and control an output current of the current drive circuit based on the dominant current. The control circuit may include a comparator configured to output a comparison voltage based on a result of a comparison between an output voltage of the current drive circuit and a voltage of a node through which a current of one of the multiple semiconductor circuit elements, and a feedback semiconductor circuit element connected to receive the comparison voltage and provide feedback on the control of the current drive circuit by the control circuit based on the comparison voltage. According to the present invention, the apparatus for controlling a current driving circuit can improve efficiency in control feedback and simplify the structure for control feedback.

Description

Apparatus for controlling current driving circuit and Apparatus for driving voice coil motor

The present invention relates to a current driving circuit control device and a voice coil motor driving device.

In recent electronic devices, a camera is one of the most essential functions, and as its performance increases, high-performance camera modules ranging from millions of pixels to more than 10 million pixels are installed and released.

However, a camera module used in an electronic device requiring miniaturization, such as a mobile device, may have a limited space available in the electronic device compared to such a high-pixel camera module.

Accordingly, the camera module adopts the Optical Image Stabilization (OIS) function, as image degradation may occur even with minute movements such as external vibration or hand shake during image shooting due to the small lens aperture and small image pixel size. In order to more easily capture high-quality images, an Auto Focus function may be employed.

In order to perform the above-described optical image stabilization function or autofocus function, the camera module may use a voice coil motor for transferring the lens.

A structure for controlling a current driven object such as a voice coil motor is also required to be miniaturized, and efficient and stable control/drive performance compared to its size is also required.

Laid-open Patent Publication No. 10-2016-0126915

The present invention provides a current driving circuit control device and a voice coil motor driving device.

A current driving circuit control apparatus according to an embodiment of the present invention forms a current dominant in a control circuit based on a current-mirror structure of a plurality of semiconductor circuit elements according to an input control signal, and and the control circuit configured to control an output current of a current driving circuit based on a dominant current, wherein the control circuit comprises: an output voltage of the current driving circuit and a node through which a current of one of the plurality of semiconductor circuit elements flows. a comparator outputting a comparison voltage based on a voltage comparison result; and a feedback semiconductor circuit element connected to receive the comparison voltage and to feed back control of the control circuit to the current driving circuit based on the comparison voltage. may include

A voice coil motor driving apparatus according to an embodiment of the present invention includes: the current driving circuit control device; and a current driving circuit controlled by the current driving circuit control device and comprising at least four driving semiconductor circuit elements coupled in a bridge structure, the current driving circuit outputting an output current flowing through a voice coil motor; may include

The current driving circuit control device and the voice coil motor driving device according to an embodiment of the present invention can improve control feedback efficiency, simplify the control feedback structure, and have efficient and stable control/driving performance compared to size. can

The apparatus for controlling a current driving circuit and the apparatus for driving a voice coil motor according to an embodiment of the present invention may improve control/drive linearity, and thus may improve a control/drive range and/or sensitivity.

1A to 1F are circuit diagrams illustrating an apparatus for controlling a current driving circuit and a device for driving a voice coil motor according to an embodiment of the present invention.
2A is a graph illustrating an input voltage of a comparator when a resistance value of a feedback control resistor of a current driving circuit control device according to an embodiment of the present invention is large and small.
2B is a graph illustrating an output current when a resistance value of a feedback control resistor of a current driving circuit control apparatus according to an embodiment of the present invention is large and small.
3 is a view showing that the voice coil motor driving apparatus according to an embodiment of the present invention is applied to a camera module control structure.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS [0012] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS [0010] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS [0010] Reference is made to the accompanying drawings, which show by way of illustration specific embodiments in which the present invention may be practiced. It should be understood that the various embodiments of the present invention are different but need not be mutually exclusive. For example, certain shapes, structures, and characteristics described herein with respect to one embodiment may be implemented in other embodiments without departing from the spirit and scope of the invention. In addition, it should be understood that the location or arrangement of individual components within each disclosed embodiment may be changed without departing from the spirit and scope of the present invention. Accordingly, the following detailed description is not intended to be taken in a limiting sense, and the scope of the present invention, if properly described, is limited only by the appended claims, along with all scope equivalents to those claimed. Like reference numerals in the drawings refer to the same or similar functions throughout the various aspects.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings in order to enable those of ordinary skill in the art to easily practice the present invention.

1A to 1F are circuit diagrams illustrating an apparatus for controlling a current driving circuit and a device for driving a voice coil motor according to an embodiment of the present invention.

Referring to FIG. 1A , a voice coil motor driving device 220a according to an embodiment of the present invention may include a current driving circuit control device 100a, and the current driving circuit control device according to an embodiment of the present invention. Reference numeral 100a may control the current driving circuit 150 and may include a control circuit 110a.

For example, the current driving circuit control apparatus 100a and the current driving circuit 150 may be implemented as at least one semiconductor integrated circuit, and may share supply voltages VDD and VSS. One of the supply voltages VDD and VSS may be a ground voltage.

The control circuit 110a may include at least some of a plurality of semiconductor circuit elements 111a, 112a, 114a, and 115a, a feedback semiconductor circuit element 113, and a control semiconductor circuit element 116, and includes a comparator 120. may include

For example, each of the plurality of semiconductor circuit elements 111a, 112a, 114a, and 115a, the feedback semiconductor circuit element 113 and the control semiconductor circuit element 116 may be implemented as a semiconductor transistor (eg, MOSFET, BJT) or a diode. can

Figure 1a shows that the semiconductor circuit element close to the supply voltage VDD is a p-type transistor, and the semiconductor circuit element close to the supply voltage VSS is an n-type transistor, but the n-type/p-type relationship of the transistors depends on the design. In contrast to the n-type/p-type relationship shown in 1a, it may be implemented.

The control circuit 110a forms a current dominant in the control circuit 110a according to the input control signal based on the current-mirror structure of the plurality of semiconductor circuit elements 111a, 112a, 114a, and 115a. can do.

For example, when each of the plurality of semiconductor circuit elements 111a, 112a, 114a, and 115a is a transistor, one of the plurality of semiconductor circuit elements 111a, 112a, 114a, and 115a has a structure in which a gate terminal and a drain terminal are connected to each other. may have a structure in which the gate terminal is connected to the other gate terminal of the plurality of semiconductor circuit elements 111a, 112a, 114a, and 115a.

Accordingly, one of the plurality of semiconductor circuit elements 111a, 112a, 114a, and 115a may operate such that a current corresponding to the voltage of the gate/drain terminal flows like a diode, and the plurality of semiconductor circuit elements 111a, 112a, Since the voltage of one of the gate terminals of one of 114a and 115a and the other gate terminal may be shared, the current of one of the plurality of semiconductor circuit elements 111a, 112a, 114a, and 115a and the current of the other have similar characteristics (eg, response characteristics). , temperature characteristics, process deviation characteristics). Accordingly, currents of one of the plurality of semiconductor circuit elements 111a, 112a, 114a, and 115a and the other may have a current-mirror relationship with each other.

One of the plurality of semiconductor circuit elements (111a, 112a, 114a, 115a) and the current ratio of the other one of the plurality of semiconductor circuit elements (111a, 112a, 114a, 115a) and the other one of the channel width (channel width) It may be determined according to the ratio, and may vary slightly according to channel length modulation of the other one of the plurality of semiconductor circuit elements 111a, 112a, 114a, and 115a.

For example, the control circuit 110a controls the second, third, and fourth semiconductor circuit elements among the plurality of semiconductor circuit elements based on the current IDAC_I flowing in the first semiconductor circuit element 111a among the plurality of semiconductor circuit elements. Dominant currents MIR_1, MIR_2, and MIR_3 flowing through (112a, 114a, 115a) may be formed.

The current IDAC_I may be based on an input control signal. For example, the control circuit 110a may include the current provider 140 , and the current provider 140 may receive a control signal and output a current IDAC_I based on the control signal. For example, the current provider 140 may be a digital-analog converter that converts a digital-type control signal into an analog-type current IDAC_I corresponding to the digital-analog converter.

Accordingly, the control circuit 110a may form the dominant currents MIR_1, MIR_2, and MIR_3 based on the input control signal, and the current driving circuit 150 based on the dominant currents MIR_1, MIR_2, and MIR_3. may be configured to control the output currents DRV_I1 and DRV_I2 of

For example, the control semiconductor circuit element 116 that may be included in the control circuit 110a may form the control voltage V_D based on the dominant currents MIR_1, MIR_2, and MIR_3, and the control voltage V_D. can be used to generate input voltages (LNG, RNG) of the driving semiconductor circuit element.

For example, the control expander 119 that may be included in the control circuit 110a may be configured to generate a plurality of control voltages based on the control voltage V_D. The plurality of control voltages may be the same as input voltages LNG and RNG of the driving semiconductor circuit element. For example, the control expander 119 may be implemented as a multiplexer.

The current driving circuit 150 may include at least four driving semiconductor circuit elements 151 , 152 , 153 , 154 coupled in a bridge structure, and an output current DRV_I1 flowing through the voice coil motor 230 , DRV_I2) can be formed. For example, the bridge structure may be one of an H-bridge, a half-bridge, and a full-bridge, and may vary depending on a driving target of the current driving circuit 150 . The H-bridge may have an efficient structure for driving the voice coil motor 230 .

The first and second driving semiconductor circuit elements 151 and 152 among the at least four driving semiconductor circuit elements may be n-type semiconductor transistors, and the third and fourth driving semiconductor circuit elements 153 of the at least four driving semiconductor circuit elements. , 154) may be a p-type semiconductor transistor.

For example, the driving controller 130 that may be included in the voice coil motor driving device 220a may receive input voltages LNG and RNG of the driving semiconductor circuit elements from the control circuit 110a, and the control circuit 110a ) based on the input voltage (LNG, RNG) provided from the input voltage (LNG, RNG, LPG, RPG) can be provided to the input terminals of at least four driving semiconductor circuit elements (151, 152, 153, 154) .

When the driving controller 130 operates in the first mode, the input voltages RNG and RPG of the first and fourth driving semiconductor circuit elements 151 and 154 are high and the second and third driving semiconductor circuit elements 152, 153) can operate so that the input voltage (LNG, LPG) is low. Accordingly, the first and third driving semiconductor circuit elements 151 and 153 may form a first output current DRV_I1.

When the driving controller 130 operates in the second mode, the input voltages RNG and RPG of the first and fourth driving semiconductor circuit elements 151 and 154 are low, and the second and third driving semiconductor circuit elements 152 and 152 , 153) can operate so that the input voltage (LNG, LPG) is high. Accordingly, the second and fourth driving semiconductor circuit elements 152 and 154 may form the second output current DRV_I2 .

That is, the control circuit 110a may differentially control the input voltages of at least two of the at least four driving semiconductor circuit elements 151 , 152 , 153 , and 154 based on the plurality of control voltages LNG and RNG. .

The direction of the first output current DRV_I1 and the direction of the second output current DRV_I2 may be opposite to each other, and the magnitude of the first output current DRV_I1 and the magnitude of the second output current DRV_I2 are determined by the control circuit 110a ) may be determined based on the dominant currents MIR_1, MIR_2, and MIR_3.

The current driving circuit control apparatus 100a may secure control stability by receiving the feedback of the first and second voltages V11 and V12 of the current driving circuit 150 . For example, the feedback provider 155 that may be included in the current driving circuit control device 100a may receive the first and second voltages V11 and V12, and the first and second voltages V11 and V12. ) may generate an output voltage V1 dependent on at least one and provide it to the current driving circuit control device 100a. For example, the feedback provider 155 may be implemented as a multiplexer.

The comparator 120 compares the output voltage V1 of the current driving circuit 150 with the voltage V2 of the node through which one of the plurality of semiconductor circuit elements 111a, 112a, 114a, and 115a flows, and the result of the comparison is Based on the comparison voltage V3 can be output.

The feedback semiconductor circuit element 113 may be connected to receive the comparison voltage V3 and to feedback control of the current driving circuit 150 of the control circuit 110a based on the comparison voltage V3 .

Accordingly, the comparator 120 and the feedback semiconductor circuit element 113 provide not only the feedback of the current driving circuit 150, but also the electrical state of the current driving circuit 150 and the plurality of semiconductor circuit elements 111a, 112a, 114a, 115a. electrical properties can be matched with each other. That is, the comparator 120 and the feedback semiconductor circuit element 113 include matching elements between the current driving circuit 150 and the plurality of semiconductor circuit elements 111a, 112a, 114a, and 115a to the feedback element of the current driving circuit 150 . Since they can be integrated, a more efficient feedback control structure of the current driving circuit control device 100a can be implemented.

In addition, since the feedback structure of the plurality of driving semiconductor circuit elements of the current driving circuit 150 can be integrally implemented with one comparator 120 and one feedback semiconductor circuit element 113 , the comparator 120 and the feedback semiconductor circuit The element 113 may further simplify the feedback structure of the current driving circuit 150 .

The feedback semiconductor circuit element 113 may be connected such that the current MIR_1_FD flowing through the control semiconductor circuit element 116 varies according to the current MIR_3 of the feedback semiconductor circuit element 113 .

The current MIR_3 of the feedback semiconductor circuit element 113 may be dependent on a difference between the comparison voltage V3 of the gate terminal of the feedback semiconductor circuit element 113 and the voltage V_FD of the source terminal.

Among the plurality of semiconductor circuit elements, the dominant current MIR_1 of the second semiconductor circuit element 112a is the sum of the current MIR_3 of the feedback semiconductor circuit element 113 and the current MIR_1_FD flowing through the control semiconductor circuit element 116 . can That is, the current MIR_1_FD flowing through the control semiconductor circuit element 116 may decrease as the current MIR_3 of the feedback semiconductor circuit element 113 increases.

Accordingly, the feedback semiconductor circuit element 113 performs feedback on the current MIR_1_FD flowing in the control semiconductor circuit element 116 based on the current MIR_3 of the feedback semiconductor circuit element 113 to control the semiconductor circuit element 116 . ) of the control voltage V_D may be fed back.

The control semiconductor circuit element 116 may have a diode connection structure in which a gate terminal and a drain terminal are connected to each other, and a control voltage V_D corresponding to the current MIR_1_FD flowing through the control semiconductor circuit element 116 may be formed. . Since the control voltage V_D is dependent on the output currents DRV_I1 and DRV_I2 of the current driving circuit 150 , the feedback semiconductor circuit element 113 may perform feedback to the current driving circuit 150 .

The output resistor 118a and the output capacitor 118b, which may be included in the control circuit 110a, may operate as a low-pass filter, and may be electrically connected to a plurality of terminals of the control semiconductor circuit element 116, and a control voltage Noise included in (V_D) can be removed.

The current MIR_3 of the feedback semiconductor circuit element 113 may be substantially equal to the current MIR_1 of the fourth semiconductor circuit element 115a among the plurality of semiconductor circuit elements. The fourth semiconductor circuit element 115a may operate in a triode mode or a saturation mode according to the voltage V2 . The difference between the current MIR_3 of the fourth semiconductor circuit element 115a and the first and second dominant currents MIR_1 and MIR_2 may increase when the fourth semiconductor circuit element 115a operates in the triode mode. .

A node corresponding to one of the comparison targets of the comparator 120 may be a node through which the current MIR_3 flowing through the feedback semiconductor circuit element 113 flows. Since the node may be affected by the current mirror structure of the fourth semiconductor circuit element 115a, the comparator 120 feeds back an electrical state of the current mirror structure of the plurality of semiconductor circuit elements 111a, 112a, 114a, and 115a. can receive

The control circuit 110a may further include a feedback control resistor R1 connected to the current MIR_3 flowing through the feedback semiconductor circuit element 113 to flow.

Assuming that the current MIR_3 has a specific magnitude, the difference between the voltages V_C and V2 across the feedback control resistor R1 may increase as the resistance value of the feedback control resistor R1 increases. Accordingly, the voltage difference between the drain terminal and the source terminal of the feedback semiconductor circuit element 113 may become smaller as the resistance value of the feedback control resistor R1 increases, and the drain terminal and the source terminal of the fourth semiconductor circuit element 115a. The voltage difference therebetween may decrease as the resistance value of the feedback control resistor R1 increases.

As the voltage difference between the drain terminal and the source terminal of the feedback semiconductor circuit element 113 is smaller, the effect of the voltage of the gate terminal of the feedback semiconductor circuit element 113 on the current MIR_3 of the feedback semiconductor circuit element 113 is can be small, and the feedback gain of the feedback semiconductor circuit element 113 for the control semiconductor circuit element 116 or the current driving circuit 150 can be small. Accordingly, the feedback adjusting resistor R1 may be used to adjust the feedback sensitivity of the control circuit 110a.

In addition, as the feedback control resistor R1 increases, a change in the drain voltage of at least one of the fourth semiconductor circuit element 115a and the feedback semiconductor circuit element 113 is increased by the plurality of driving semiconductor circuit elements 151 of the current driving circuit 150 . , 152, 153, 154) may be more similar to the first and second voltage fluctuations.

Accordingly, the relationship between the dominant currents MIR_1 , MIR_2 , and MIR_3 of the control circuit 110a and the output currents DRV_I1 and DRV_I2 of the current driving circuit 150 may be more linear as the feedback control resistor R1 increases.

For example, the resistance value of the feedback control resistor R1 may be greater than the resistance value of the output resistor 118a, and the equivalent resistance value of the diode connection structure of the control semiconductor circuit element 116 (eg, the control voltage V_D ) divided by the average of the current (MIR_1_FD)) may be larger than the average of the current (MIR_1_FD).

Referring to FIG. 1B , a voice coil motor driving device 220b according to an embodiment of the present invention may include a current driving circuit control device 100b, and the current driving circuit control device according to an embodiment of the present invention. Reference numeral 100b may control the current driving circuit 150 and may include a control circuit 110b.

According to the design, the number of the first, second, and third semiconductor circuit elements 111b, 112b, and 114b among the plurality of semiconductor circuit elements of the control circuit 110b is the first, second, and third semiconductor circuit elements shown in FIG. 1A. It may be smaller than the number of semiconductor circuit elements. For example, the number of the first, second, and third semiconductor circuit elements 111b , 112b , and 114b may be determined based on the supply voltages VDD and VSS.

Referring to FIG. 1C , a voice coil motor driving device 220c according to an embodiment of the present invention may include a current driving circuit control device 100c, and the current driving circuit control device according to an embodiment of the present invention. Reference numeral 100c may control the current driving circuit 150 and may include a control circuit 110c.

According to the design, the second and third semiconductor circuit elements 112b and 114b among the plurality of semiconductor circuit elements of the control circuit 110c may be omitted. According to the design, the gate terminal of the fourth semiconductor circuit element 115a and the gate terminal of the control semiconductor circuit element 116 among the plurality of semiconductor circuit elements may be connected to each other.

Referring to FIG. 1D , a voice coil motor driving device 220d according to an embodiment of the present invention may include a current driving circuit control device 100d, and the current driving circuit control device according to an embodiment of the present invention. Reference numeral 100d may control the current driving circuit 150 and may include a control circuit 110d. Depending on the design, the first, second, and third semiconductor circuit elements 111b, 112b, and 114b among the plurality of semiconductor circuit elements of the control circuit 110d may be omitted.

Referring to FIG. 1E , a voice coil motor driving device 220e according to an embodiment of the present invention may include a current driving circuit control device 100e, and the current driving circuit control device according to an embodiment of the present invention. Reference numeral 100e may control the current driving circuit 150 and may include a control circuit 110e. Depending on the design, the first, second and third semiconductor circuit elements 111b, 112b, and 114b among the plurality of semiconductor circuit elements of the control circuit 110e may be omitted, and the control expander 119 shown in FIG. 1A may be omitted. may also be omitted.

Referring to FIG. 1F , a voice coil motor driving apparatus 220f according to an embodiment of the present invention may include a current driving circuit control device 100f, and the current driving circuit control device according to an embodiment of the present invention. Reference numeral 100f may control the current driving circuit 150 and may include a control circuit 110f. Depending on the design, the first, second and third semiconductor circuit elements 111b, 112b, and 114b among the plurality of semiconductor circuit elements of the control circuit 110f may be omitted, and the control expander and feedback adjustment shown in FIG. 1A may be omitted. The resistance may also be omitted.

2A is a graph illustrating an input voltage of a comparator when a resistance value of a feedback control resistor of a current driving circuit control device according to an embodiment of the present invention is large and small.

Referring to FIG. 2A , when the resistance value of the feedback control resistor is large, the voltage V2_HR input to the comparator may vary linearly according to the current IDAC_I of the control circuit.

Referring to FIG. 2A , when the resistance value of the feedback control resistor is small, the voltage V2_LR input to the comparator may become closer to the output voltage V1 of the current driving circuit as the current IDAC_I of the control circuit increases. .

2B is a graph illustrating an output current when a resistance value of a feedback control resistor of a current driving circuit control apparatus according to an embodiment of the present invention is large and small.

Referring to FIG. 2B , when the resistance value of the feedback control resistor is large, the output current DRV_I1_HR of the current driving circuit may vary linearly according to the current IDAC_I of the control circuit.

Referring to FIG. 2B , when the resistance value of the feedback control resistor is small, the output current DRV_I1_LR of the current driving circuit increases as the current IDAC_I of the control circuit increases. can have

The linearity of the variation of the output current DRV_I1_HR according to the variation of the current IDAC_I of the control circuit may improve the control sensitivity for the current driving circuit of the current driving circuit control apparatus according to an embodiment of the present invention.

On the other hand, the device for controlling the current driving circuit according to an embodiment of the present invention can stably control the current driving circuit regardless of the linearity of the fluctuation of the output current DRV_I1_HR according to the fluctuation of the current IDAC_I of the control circuit. , since it can have a simplified feedback structure, the design is not limited to the resistance value of the feedback control resistor.

3 is a view showing that the voice coil motor driving apparatus according to an embodiment of the present invention is applied to a camera module control structure.

Referring to FIG. 3 , the camera module control structure may include a Hall sensor 300 , a control signal generator 205 , a voice coil motor driving device 220 and a voice coil motor 230 according to an embodiment of the present invention. and may control the position and/or movement of the lens module 210 .

The Hall sensor 300 may be disposed such that a magnetic flux of the magnetic member 211 disposed in the lens module 210 passes through the hall sensor 300 based on the movement of the lens module 210 . Accordingly, the Hall sensor 300 may output a voltage corresponding to the position and/or movement of the lens module 210 .

The control signal generator 205 may generate a control signal based on the voltage output from the Hall sensor 300 , and may transmit the control signal to the voice coil motor driving device 220 . For example, the control signal generator 205 and the voice coil motor driving apparatus 220 may be implemented as at least one semiconductor integrated circuit.

For example, the control signal generator 205 may include an optical image stabilization (OIS) control structure or an auto focus (AF) control structure, and may generate a control signal based on the OIS control structure or the AF control structure. . That is, the control signal may have a value determined to move the lens module 210 to the target position corresponding to the current position of the lens module 210 .

Accordingly, the voice coil motor driving apparatus 220 may output an output current determined to move the lens module 210 to the target position in response to the current position of the lens module 210 to the voice coil motor 230 .

The voice coil motor 230 may generate a magnetic flux based on the output current, and may be disposed near the magnetic member 211 of the lens module 210 . For example, the voice coil motor 230 and the Hall sensor 300 may be disposed on the first substrate 240 . The first substrate 240 may also provide an arrangement space for the control signal generator 205 and/or the voice coil motor driving device 220 . Depending on the design, the first substrate 240 may be omitted, and the control signal generator 205 and/or the voice coil motor driving device 220 may be disposed in the voice coil motor 230 .

Depending on the design, the Hall sensor 300 may be implemented as an integrated circuit built-in type, and may be implemented as a single integrated circuit together with the control signal generator 205 and/or the voice coil motor driving device 220 . Since the device for controlling the current driving circuit and the device for driving the voice coil motor according to an embodiment of the present invention have a simplified feedback structure and thus can be more easily downsized, the Hall sensor 300 can be more easily included.

The lens module 210 may move according to a force received by the magnetic member 211 in response to the magnetic flux of the voice coil motor 230 . In this case, the lens module 210 may move to change the magnetic flux in the opposite direction to the change in the magnetic flux passing through the Hall sensor 300 . Accordingly, the absolute position of the lens module 210 may be substantially fixed, and the image acquired by the lens module 210 may be stable.

Meanwhile, the processor 270 may be implemented as an image signal processor (ISP), may receive image information from the image sensor 262 on the first support member 261 , and use the processed information to drive the voice coil motor. 220 or the control signal generator 205 may provide.

The lens module 210 may move one-dimensionally or two-dimensionally according to the rotation of the plurality of guide balls 212 on the second support member 213 , and may be surrounded by the housing 250 .

A structure including the lens module 210 , peripheral components of the lens module 210 , and the housing 250 may be defined as a camera module.

In the above, the present invention has been described as an embodiment, but the present invention is not limited to the above embodiment, and without departing from the gist of the present invention as claimed in the claims, those of ordinary skill in the art to which the invention pertains Anyone can make various modifications.

100a: current drive circuit control device
110a: control circuit
111a: first semiconductor circuit element
112a: second semiconductor circuit element
113a: feedback semiconductor circuit element
114a: third semiconductor circuit element
115a: fourth semiconductor circuit element
116a: control semiconductor circuit element
118a: output resistance
118b: output capacitor
119: control expander
120: comparator
130: drive controller
140: current provider
150: current driving circuit
151: first driving semiconductor circuit element
152: second driving semiconductor circuit element
153: third driving semiconductor circuit element
154: fourth driving semiconductor circuit element
155: feedback provider
230: voice coil motor (voice coil motor)
IDAC_I: control current
DRV_I: output current
MIR_1: first dominant current
MIR_2: second dominant current
MIR_3: third dominant current
R1: feedback regulating resistor
V1: output voltage
V2: node voltage
V3: comparison voltage

Claims (16)

to form a dominant current in the control circuit based on the current-mirror structure of the plurality of semiconductor circuit elements according to the input control signal, and to control the output current of the current driving circuit based on the dominant current comprising the control circuit configured;
The control circuit is
a comparator outputting a comparison voltage based on a comparison result between the output voltage of the current driving circuit and the voltage of a node through which one of the plurality of semiconductor circuit elements flows; and
a feedback semiconductor circuit element connected to receive the comparison voltage and to feed back control of the control circuit to the current driving circuit based on the comparison voltage; Current driving circuit control device comprising a.
According to claim 1,
The current driving circuit includes at least four driving semiconductor circuit elements coupled in a bridge structure,
wherein the control circuit controls an input voltage of at least one of the at least four driving semiconductor circuit elements by using the dominant current and a control voltage based on a feedback of the feedback semiconductor circuit element.
3. The method of claim 2,
the control circuit further comprising a control expander configured to generate a plurality of control voltages based on the control voltage;
wherein the control circuit differentially controls input voltages of at least two of the at least four driving semiconductor circuit elements based on the plurality of control voltages.
According to claim 1,
the current driving circuit comprises at least four driving semiconductor circuit elements coupled in an H-bridge structure;
wherein the comparator is between a first voltage of a node between a first and a second driving semiconductor circuit element among the at least four driving semiconductor circuit elements and a third and a fourth driving semiconductor circuit element among the at least four driving semiconductor circuit elements. A current driving circuit control device receiving the output voltage dependent on at least one of a second voltage of a node.
The method of claim 1 , wherein the control circuit comprises:
a control semiconductor circuit element through which a current based on the dominant current and the feedback of the feedback semiconductor circuit element flows and forms a control voltage;
The feedback semiconductor circuit element is connected to a current that flows through the control semiconductor circuit element according to the current of the feedback semiconductor circuit element is connected to vary.
6. The method of claim 5,
The control semiconductor circuit element has a structure in which a plurality of terminals of the control semiconductor circuit element are connected to each other;
and the control voltage is a voltage of a plurality of terminals of the control semiconductor circuit element.
6. The method of claim 5,
one of the plurality of semiconductor circuit elements is connected such that a current flowing through the control semiconductor circuit element before being fed back by the feedback semiconductor circuit element flows;
The other one of the plurality of semiconductor circuit elements is connected to a current flowing through the feedback semiconductor circuit element to flow.
8. The method of claim 7, wherein the control circuit comprises:
and a feedback regulating resistor connected to allow a current flowing through the feedback semiconductor circuit element to flow.
9. The method of claim 8,
an output resistor electrically coupled to the plurality of terminals of the control semiconductor circuit element;
A resistance value of the feedback control resistor is greater than a resistance value of the output resistor.
According to claim 1,
The node corresponding to one of the comparison objects of the comparator is a node through which a current flowing through the feedback semiconductor circuit element flows.
11. The method of claim 10, wherein the control circuit,
and a feedback regulating resistor electrically connected between the node and the feedback semiconductor circuit element.
The method of claim 11 , wherein the control circuit comprises:
a control semiconductor circuit element through which a current based on the dominant current and the feedback of the feedback semiconductor circuit element flows and forms a control voltage;
The control semiconductor circuit element has a structure in which a plurality of terminals of the control semiconductor circuit element are connected to each other;
A resistance value of the feedback regulating resistor is greater than an equivalent resistance value of the control semiconductor circuit element.
According to claim 1,
Further comprising a current provider for receiving the control signal and outputting a current based on the control signal,
and the plurality of semiconductor circuit elements are configured to form the dominant current based on a current output from the current provider.
The method of claim 13 , wherein the control circuit comprises:
a control semiconductor circuit element through which a current based on the dominant current and the feedback of the feedback semiconductor circuit element flows and forms a control voltage;
one of the plurality of semiconductor circuit elements is connected such that a current flowing through the control semiconductor circuit element before being fed back by the feedback semiconductor circuit element flows;
The other one of the plurality of semiconductor circuit elements is connected to a current flowing through the feedback semiconductor circuit element to flow.
The current driving circuit control device of claim 1; and
a current driving circuit controlled by the current driving circuit control device, comprising at least four driving semiconductor circuit elements coupled in a bridge structure, and outputting an output current flowing through a voice coil motor; A voice coil motor drive device comprising a.
16. The method of claim 15,
a driving controller configured to generate an input voltage of the at least four driving semiconductor circuit elements, the driving controller configured to generate an input voltage of at least one of the at least four driving semiconductor circuit elements based on a control voltage;
The control circuit further includes a control semiconductor circuit element through which a current based on the dominant current and the feedback of the feedback semiconductor circuit element flows and forming the control voltage.

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