CN107205110A - Hall sensor off-centre correcting circuit and the camera module for possessing this - Google Patents
Hall sensor off-centre correcting circuit and the camera module for possessing this Download PDFInfo
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- CN107205110A CN107205110A CN201611010057.5A CN201611010057A CN107205110A CN 107205110 A CN107205110 A CN 107205110A CN 201611010057 A CN201611010057 A CN 201611010057A CN 107205110 A CN107205110 A CN 107205110A
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- electric current
- hall sensor
- offset correction
- signal
- selector
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/60—Control of cameras or camera modules
- H04N23/68—Control of cameras or camera modules for stable pick-up of the scene, e.g. compensating for camera body vibrations
- H04N23/681—Motion detection
- H04N23/6812—Motion detection based on additional sensors, e.g. acceleration sensors
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N17/00—Diagnosis, testing or measuring for television systems or their details
- H04N17/002—Diagnosis, testing or measuring for television systems or their details for television cameras
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- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- General Physics & Mathematics (AREA)
- Computer Networks & Wireless Communication (AREA)
- General Engineering & Computer Science (AREA)
- Nonlinear Science (AREA)
- Power Engineering (AREA)
- Measuring Magnetic Variables (AREA)
- Hall/Mr Elements (AREA)
- Transmission And Conversion Of Sensor Element Output (AREA)
Abstract
The present invention discloses a kind of Hall sensor off-centre correcting circuit of skew of correction Hall sensor automatic when driving power supply is supplied and possesses this camera module, can be included according to the off-centre correcting circuit and camera module of the Hall sensor of one embodiment of the invention：Selector, when being applied in power supply, compares the voltage between Hall sensor two ends and selects to apply one end of the offset correction electric current in the two ends of the Hall sensor；Electric current adjustment portion, current level of the adjustment supplied to the offset correction electric current of one end of the Hall sensor selected by the selector；And electric current supply department, the offset correction electric current is supplied to one end of the Hall sensor selected by the selector.
Description
Technical field
It is used to correct the Hall sensor off-centre correcting circuit of the skew of Hall sensor and possess the present invention relates to a kind of
This camera module.
Background technology
Recently, it is mobile in addition to for shooting the camera of static image or the Video Camera for shooting video
The camera module used in equipment also develops the technology on means for correcting, is reduced with improving the image quality occurred by hand shaking
Phenomenon, so as to obtain the image of high image quality.
Recently, the mode for shooting photo or video using the camera module for being installed on mobile phone is increasingly popularized, but
Be installed on mobile phone camera module because mobile device miniaturization and size is restricted.This limitation causes requirement saturating
, so that light exposure can be reduced, therefore there is picture caused by hand shaking in the miniaturization of mirror, the size of lens barrel or image sensor pixel
The problem of phenomenon of matter reduction is more serious.
Due to it is such the problem of, the camera module installed in nearest mobile device is also using at hand shaking compensation function
In gradually increased trend.
In order to compensate this hand shaking and the Hall sensor of hand shaking information can be extracted by applying.Hall sensor is because deposit
There is the problem of being difficult to extract accurate hand shaking information in skew, therefore when manufacturing Hall sensor, it is necessary to be corrected
Offset calibration (calibration) process of (offset).
But, even if the Hall sensor of above-mentioned process calibration procedure is installed into camera module, it is also possible to due to
The change of ambient conditions, environment etc. and skew is produced in Hall sensor so that the problem of in the presence of correcting offset is difficult to.
[prior art literature]
[patent document]
(patent document 1) Korean Patent Laid the 10-2012-0116036th
(patent document 2) Korean Patent Laid the 10-2012-0114065th
(patent document 3) Korean Patent Laid the 2009/0001981st
The content of the invention
According to one embodiment of the invention, there is provided a kind of skew of correction Hall sensor automatic when supplying driving power supply
Hall sensor off-centre correcting circuit and possess this camera module.
In order to solve above-mentioned problem of the invention, according to the offset correction of the Hall sensor of one embodiment of the invention
Circuit and camera module can include：Selector, when being applied in power supply, compare voltage between Hall sensor two ends and
Select to apply one end of the offset correction electric current in the two ends of the Hall sensor；Electric current adjustment portion, adjustment supply
To the current level of the offset correction electric current of one end of the Hall sensor selected by the selector；And electric current supply
Portion, the offset correction electric current is supplied to one end of the Hall sensor selected by the selector.
According to one embodiment of the invention, with the skew of automatic correction Hall sensor when driving power supply is supplied
Effect.
Brief description of the drawings
Fig. 1 is the schematic block diagram of the camera module according to one embodiment of the invention.
Fig. 2 is the schematic block diagram of the off-centre correcting circuit of the Hall sensor according to one embodiment of the invention.
Fig. 3 is the schematic circuit of the off-centre correcting circuit of the Hall sensor according to one embodiment of the invention.
Fig. 4 is the signal graph of the operation for the off-centre correcting circuit for showing the Hall sensor according to one embodiment of the invention
Shape.
Symbol description
100：Camera module 110：Motor driving part
120：Motor 130：Lens
140：Hall sensor 150：Off-centre correcting circuit
151：Selector 152：Electric current adjustment portion
153：Electric current supply department 160：Test section
170：Control unit
Embodiment
Hereinafter, in order that the personnel in the art of the present invention with ABC can easily implement this
Invent and preferred embodiment is described in detail referring to the drawings.
Fig. 1 is the schematic block diagram of the camera module according to one embodiment of the invention.
Reference picture 1, can include according to the camera module 100 of one embodiment of the invention：Motor driving part 110, electricity
Machine 120, lens 130, Hall sensor 140, off-centre correcting circuit 150, test section 160 and control unit 170.
Motor driving part 110 can according to control signal motor 120 and mobile lens 130 position.
Hall sensor 140 can export the hall signal of the positional information with lens 130, and test section 160 can be right
Hall signal from Hall sensor carries out signal transacting and output lens position signalling, control unit 170 can according to from
The motor driving of the lens position signal of test section 160 and controlled motor drive division 110.
Hall sensor 140 can dispatch from the factory, still when manufacturing product after calibration process is corrected to skew
Hall sensor 140 may be because of the ambient environmental conditions or internal bar of the camera module 100 for being provided with Hall sensor 140
Part etc. and produce skew.
Off-centre correcting circuit 150 can drive camera module 100 in user and open and apply camera module 100
Electronic product power supply or when starting application program and being applied in power supply, the skew of automatic correction Hall sensor 140.
Fig. 2 is the schematic block diagram of the off-centre correcting circuit of the Hall sensor according to one embodiment of the invention.
Reference picture 2, can include according to the off-centre correcting circuit 150 of the Hall sensor of one embodiment of the invention：Choosing
Select portion 151, electric current adjustment portion 152 and electric current supply department 153.
Selector 151 can select one end of the generation skew in the two ends of Hall sensor, and make offset correction electric current
One end of the generation skew flowed into the two ends of Hall sensor.
Electric current adjustment portion 152 can adjust the offset correction electricity according to the voltage difference between the two ends of Hall sensor
The level of stream.
Electric current supply department 153 can be into the two ends of Hall sensor one end supply that selects of selected portion 151 it is described
Offset correction electric current.
Fig. 3 is the schematic circuit of the off-centre correcting circuit of the Hall sensor according to one embodiment of the invention, Fig. 4
It is the signal graph of the operation for the off-centre correcting circuit for showing the Hall sensor according to one embodiment of the invention.
First, reference picture 3, selector 151 can include：First comparator OP1, delay portion D and latch L.
For example, selector 151 can export selection signal after relatively voltage VX1, the VX2 at the two ends of Hall sensor 140
Mux_sel, so that the low one end of the voltage that can be provided in the two ends of Hall sensor 140 of migration electric current (in addition,
Selection signal Mux_sel can also be exported in the way of migration electric current is capable of supply that one end high to voltage).
First comparator OP1 can compare voltage VX1, the VX2 at the two ends of Hall sensor 140, first comparator OP1's
Output signal Vcomp can be passed to latch L.
Delay portion D can make the application based on the power supply enable signal ENable delay scheduled times after be transferred to lock
Storage L.Accordingly, first comparator OP1 output signal Vcomp can be prevented and signal ENable is enabled being concurrently triggered, from
And latch L operation is stably carried out.
Latch L receives first comparator OP1 output signal Vcomp high level signal and enables signal ENable
High level signal when, logical operation is carried out, and enabling signal ENable in a period of high level signal, even if the first ratio
The signal level of output signal Vcomp compared with device OP1 is changed, and can also maintain selection signal Mux_sel level.
Electric current adjustment portion 152 can include the second comparator OP2, clock pulse generator ck, counter co.
Second comparator OP2 compares the output signal Vout and reference signal Vref of detector 161, and the second comparator
OP2 output signal Comp_out can be passed to clock pulse generator ck.Reference signal Vref represents that detector 161 can
The signal of the maximum voltage of output and the intermediate voltage level of minimum voltage.
Clock pulse generator ck and counter co can be operated enabling when signal ENable is high (high) level, when
Pulse generator ck is defeated in a period of the second comparator OP2 output signal Comp_out signal level is high (high) level
Go out clock signal count_clk, counter co can adjust electric current supply department step by step according to clock signal count_clk
The current level of 153 offset correction electric current.
For example, counter co can carry out sequence counting (up count) operation and be believed according to clock signal count_clk
Number make the current level rank of the offset correction electric current of electric current supply department 153 increases step by step.
Electric current supply department 153 can include current D-A conveter IDAC, current mirror MI and multiplexer MUX.
Current D-A conveter IDAC can according to counter co output signal count_out output current.
For example, counter co output signal count_out can be the data signal of 8 bits.Current D-A conveter
The output signal count_out of 8 bits can be converted into analog signal form and output current by IDAC.For example, counter co
Can be from 0000_0000 " 1 " ground sequence countings every time.
Current D-A conveter IDAC current reflection (mirroring) can be exported the skew school by current mirror MI
Positive current.
Multiplexer MUX can be according to the selection signal Mux_sel of selector 151 by offset compensation electric current biography
It is handed to one end in the two ends of Hall sensor.
Reference picture 3 and Fig. 4, for example, being the Hall sensor that should be at poised state in the ideal case because surrounding
The internal environment of environment or product and in the case of being applied in N-type magnetic field, if being applied in driving power supply power, Hall is passed
There may be voltage difference by output voltage VX1, VX2 of sensor.When driving power supply power reaches more than predetermined level, table is produced
Show the signal POR that driving power supply is normally applied, hereafter there may be enable signal ENable.
If for example, the output voltage VX1 of one end of Hall sensor is less than the output voltage VX2 of the other end, detected
The output signal Vout of the detector 161 in portion 160 signal level is likely to become high level, the second comparator OP2 output letter
Number Comp_out signal level is likely to become high level.
In addition, when first comparator OP1 output signal Vcomp signal level due to the output voltage of Hall sensor
Voltage difference between VX1, VX2 and move to high level, and first comparator OP1 output signal Vcomp height from low level
When level signal is input into latch L with the high level signal for enabling signal Enable, latch L is operated and is made selection
While signal Mux_sel signal level is from low transition into high level, the skew from electric current supply department 153 can be made
Correcting current is transferred to one end of Hall sensor.Accordingly, the voltage VX1 of one end of Hall sensor voltage level can be made
Increase, and counter co increase electric currents are until the second comparator OP2 output signal Comp_out signal level is from high level
Untill being converted into low level, interrupted when the second comparator OP2 output signal Comp_out signal level turns into low level
The increase of electric current, the offset correction electric current then maintains current level.
That is, poised state is maintained by voltage VX1, the VX2 at the two ends for making Hall sensor and corrects Hall sensor
Skew.Hereafter, the hall signal of the lensed positional information of Hall sensor output tool, and test section 160 can be with output offset
Lens position signal after being corrected.
As described above, according to the present invention it is possible to when being supplied driving power supply, the skew of Hall sensor is calibrated automatically.
There are the personnel of ABC in the art of the present invention it is understood that present invention mentioned above
Above-described embodiment and accompanying drawing are not limited to, and is defined according to claims, in the scope for the technological thought for not departing from the present invention
It is interior, the composition of the present invention can be carried out diversely to change and transform.
Claims (11)
1. a kind of off-centre correcting circuit of Hall sensor, including：
Selector, when being applied in power supply, compares the voltage between Hall sensor two ends and selects the Hall sensor
To apply one end of the offset correction electric current in two ends；
Electric current adjustment portion, the offset correction electric current of the adjustment supplied to one end of the Hall sensor selected by the selector
Current level；And
Electric current supply department, the one of the Hall sensor selected by the selector is supplied to by the offset correction electric current
End.
2. the off-centre correcting circuit of Hall sensor as claimed in claim 1, wherein,
The electric current adjustment portion produces clock signal in response to the voltage difference between the two ends of the Hall sensor, and to institute
The level that clock signal is counted and adjusts the offset correction electric current is stated, when the voltage difference is eliminated, remains described
The level of offset correction electric current.
3. the off-centre correcting circuit of Hall sensor as claimed in claim 1, wherein,
The selector includes：
Voltage difference between first comparator, the two ends of relatively more described Hall sensor；
Delay portion, make the application based on the power supply enables the signal delay scheduled time；And
Latch, when the output signal that receives the first comparator and it is described enable signal when, output selection is applied in institute
State one end of offset correction electric current.
4. the off-centre correcting circuit of Hall sensor as claimed in claim 1, wherein,
The electric current adjustment portion includes：
Second comparator, detection signal and reference signal for comparing the Hall sensor；
Clock pulse generator, the output signal based on second comparator and generate clock signal；And
Counter, the level for the offset correction electric current for being counted to the clock signal and making the electric current supply department is discretely
Change.
5. the off-centre correcting circuit of Hall sensor as claimed in claim 1, wherein,
The electric current supply department includes：
Current converter, the electric current that output level is adjusted according to the control of the electric current adjustment portion；
Current mirror, the offset correction electric current is exported by the current reflection from the current converter；
Multiplexer, the Hall sensor is transferred to according to the rotation of the selector by the offset correction electric current
Selected one end in two ends.
6. a kind of camera module, including：
Motor driving part, the position of lens is adjusted according to control signal come motor；
Hall sensor, the position for detecting the lens；
Test section, the position signalling of signal transacting and output lens is carried out to the hall signal of the Hall sensor；
Off-centre correcting circuit, when being applied in power supply, the voltage between the two ends of relatively more described Hall sensor, and select described
One end in the two ends of Hall sensor and apply offset correction electric current；And
Control unit, controls the motor of the motor driving part to drive according to the lens position signal of the test section.
7. camera module as claimed in claim 6, wherein,
The off-centre correcting circuit includes：
Selector, selects to be applied in one end of offset correction electric current in the two ends of the Hall sensor；
Electric current adjustment portion, the offset correction electric current of the adjustment supplied to one end of the Hall sensor selected by the selector
Current level；And
Electric current supply department, the one of the Hall sensor selected by the selector is supplied to by the offset correction electric current
End.
8. camera module as claimed in claim 7, wherein,
The electric current adjustment portion produces clock signal in response to the voltage difference between the two ends of the Hall sensor, and to institute
The level that clock signal is counted and adjusts the offset correction electric current is stated, when the voltage difference is eliminated, remains described
The level of offset correction electric current.
9. camera module as claimed in claim 7, wherein,
The selector includes：
Voltage difference between first comparator, the two ends of relatively more described Hall sensor；
Delay portion, make the application based on the power supply enables the signal delay scheduled time；And
Latch, when the output signal that receives the first comparator and it is described enable signal when, output selection is applied in institute
State one end of offset correction electric current.
10. camera module as claimed in claim 7, wherein,
The electric current adjustment portion includes：
Second comparator, detection signal and reference signal for comparing the Hall sensor；
Clock pulse generator, the output signal based on second comparator and generate clock signal；And
Counter, the level for the offset correction electric current for being counted to the clock signal and making the electric current supply department is discretely
Change.
11. camera module as claimed in claim 7, wherein,
The electric current supply department includes：
Current converter, the electric current that output level is adjusted according to the control of the electric current adjustment portion；
Current mirror, the offset correction electric current is exported by the current reflection from the current converter；
Multiplexer, the Hall sensor is transferred to according to the rotation of the selector by the offset correction electric current
Selected one end in two ends.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR10-2016-0031618 | 2016-03-16 | ||
| KR1020160031618A KR20170107819A (en) | 2016-03-16 | 2016-03-16 | Hall sensor offset correction circuit and camera module having thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107205110A true CN107205110A (en) | 2017-09-26 |
Family
ID=59904678
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611010057.5A Pending CN107205110A (en) | 2016-03-16 | 2016-11-16 | Hall sensor off-centre correcting circuit and the camera module for possessing this |
Country Status (2)
| Country | Link |
|---|---|
| KR (1) | KR20170107819A (en) |
| CN (1) | CN107205110A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108519571A (en) * | 2018-03-14 | 2018-09-11 | 上海威特力焊接设备制造股份有限公司 | The method and device of Hall current sensor offset correction for welding machine |
| CN108562775A (en) * | 2018-04-19 | 2018-09-21 | 阳光电源股份有限公司 | A kind of motor control system of electric automobile and its current detecting modification method |
| CN111641773A (en) * | 2019-03-01 | 2020-09-08 | 中国科学院长春光学精密机械与物理研究所 | Image stabilization control system and control method of quick reflector |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR102500418B1 (en) * | 2020-09-29 | 2023-02-16 | 삼성전기주식회사 | Apparatus for reducing offset of hall sensor and apparatus for control lens module |
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| CN1576857A (en) * | 2003-06-27 | 2005-02-09 | 日本胜利株式会社 | Current sensor |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108519571A (en) * | 2018-03-14 | 2018-09-11 | 上海威特力焊接设备制造股份有限公司 | The method and device of Hall current sensor offset correction for welding machine |
| CN108519571B (en) * | 2018-03-14 | 2024-01-23 | 上海威特力焊接设备制造股份有限公司 | Method and device for offset correction of Hall current sensor of welding machine |
| CN108562775A (en) * | 2018-04-19 | 2018-09-21 | 阳光电源股份有限公司 | A kind of motor control system of electric automobile and its current detecting modification method |
| CN111641773A (en) * | 2019-03-01 | 2020-09-08 | 中国科学院长春光学精密机械与物理研究所 | Image stabilization control system and control method of quick reflector |
| CN111641773B (en) * | 2019-03-01 | 2021-11-16 | 中国科学院长春光学精密机械与物理研究所 | Image stabilization control system and control method of quick reflector |
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| Publication number | Publication date |
|---|---|
| KR20170107819A (en) | 2017-09-26 |
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