CN206237305U - The reduction voltage circuit of camera module test platform - Google Patents
The reduction voltage circuit of camera module test platform Download PDFInfo
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- CN206237305U CN206237305U CN201621354519.0U CN201621354519U CN206237305U CN 206237305 U CN206237305 U CN 206237305U CN 201621354519 U CN201621354519 U CN 201621354519U CN 206237305 U CN206237305 U CN 206237305U
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Abstract
The utility model provides a kind of reduction voltage circuit of camera module test platform, including step-down chip, inductance, electric capacity and resistance, and step-down chip includes 16 pins, 1 pin ground connection；2 pins are connected by inductance with the control source port of camera module；One end of first electric capacity and the second electric capacity is connected in turn between camera module test platform and inductance, other end ground connection；3 and 5 pins are connected with the output port of camera module test platform respectively；3rd electric capacity to one end of the 5th electric capacity is connected on the circuit between 3 pins and the output port of camera module test platform, and the other end is also grounded respectively；One end of first resistor is connected with the control source port of camera module, one end access power cathode of second resistance, and the other end of first resistor and second resistance is connected with 4 pins respectively；One end of 6th electric capacity is connected with 6 pins, and the other end is connected between inductance and 2 pins.The caloric value of LDO can be reduced using the utility model.
Description
Technical field
The utility model is related to camera module technical field of measurement and test, more specifically, is related to a kind of camera module to survey
Try the reduction voltage circuit of platform.
Background technology
When camera module is produced in batches, generally camera module is lighted and its property is tested using test platform
Can, and some camera modules are internally integrated the element of the high currents such as LED, therefore, by test platform to shooting head mould
When group is tested, test platform needs to provide high current to camera module, so that camera module normal work, but take the photograph
As head mould group required voltage is typically small (such as 1.8V, 2.8V, 5V), at this time, it may be necessary to the voltage that will be provided on test platform
Voltage needed for dropping to camera module a, it is generally the case that low pressure difference linearity for being used to be depressured is installed in test platform
Voltage-stablizer (low dropout regulator, LDO), the maximum voltage for providing of low pressure difference linear voltage regulator is 6.5V or 10V
(maximum voltage that different test platforms are provided different), by low pressure difference linear voltage regulator by the output voltage drop of test platform
Voltage to needed for camera module, but there is certain defect in low pressure difference linear voltage regulator, when low pressure difference linear voltage regulator will
The output voltage of test platform drop to camera module needed for voltage when, on low pressure difference linear voltage regulator just have generation it is larger
Voltage difference and with larger electric current, the caloric value of low pressure difference linear voltage regulator can very big (caloric value be that low pressure difference linearity is steady
The product of electric current and voltage difference on depressor), when the caloric value of low pressure difference linear voltage regulator is more than 1W, low pressure difference linearity voltage stabilizing
The chip of device will be hot, and when the caloric value of low pressure difference linear voltage regulator is more than 2W or so, test platform can start excess temperature guarantor
Shield module closes test platform, so as to can not test the performance of camera module.
Utility model content
In view of the above problems, the purpose of this utility model is to provide a kind of reduction voltage circuit of camera module test platform,
Test platform is caused to be automatically switched off greatly with the caloric value for solving the problems, such as low pressure difference linear voltage regulator.
The reduction voltage circuit of the camera module test platform that the utility model is provided, is connected to camera module test platform
Between camera module, the reduction voltage circuit of camera module test platform includes：Step-down chip, inductance, the first electric capacity, second
Electric capacity, the 3rd electric capacity, the 4th electric capacity, the 5th electric capacity, the 6th electric capacity, first resistor and second resistance；Wherein, it is depressured the 1 of chip
Pin accesses power cathode；2 pins for being depressured chip are connected with one end of inductance, the other end of inductance and the electricity of camera module
Pressure input port connection；From camera module to the direction of inductance, one end of the first electric capacity and the second electric capacity is connected in turn to be taken the photograph
As on the circuit between the control source port of head mould group and inductance, the other end of the first electric capacity and the second electric capacity is respectively connected to electricity
Source negative pole；3 pins for being depressured chip are connected to the output port of camera module test platform；3rd electric capacity, the 4th electric capacity and
One end of 5th electric capacity is connected to the circuit between 3 pins of step-down chip and the output end of camera module test platform
On, the other end of the 3rd electric capacity, the 4th electric capacity and the 5th electric capacity is respectively connected to power cathode；One end of first resistor and camera
The control source port connection of module, power cathode, the other end and second resistance of first resistor are accessed in one end of second resistance
The other end respectively with step-down chip 4 pins be connected；It is depressured 5 pins of chip and the output end of camera module test platform
Mouth connection；6 pins for being depressured chip are connected with one end of the 6th electric capacity, and the other end of the 6th electric capacity is connected to inductance with step-down core
On circuit between 2 pins of piece.
Additionally, it is preferred that structure be that the maximum voltage of the output port of camera module test platform output is 10V；The
The resistance of one resistance is 25K Ω；The resistance of second resistance is 11K Ω.
Furthermore it is preferred that structure be that the capacity of the capacity of the first electric capacity and the second electric capacity is respectively 20-25 μ F；3rd electricity
The capacity of appearance, the 4th electric capacity and the 5th electric capacity is respectively 9-12 μ F；The capacity of the 6th electric capacity is 0.07-0.2 μ F；The inductance of inductance
It is 0.8-1.3 μ H to measure.
Furthermore, preferred structure is that the capacity of the capacity of the first electric capacity and the second electric capacity is respectively 22 μ F；3rd electric capacity,
The capacity of the 4th electric capacity and the 5th electric capacity is respectively 10 μ F；The capacity of the 6th electric capacity is 0.1 μ F；The inductance value of inductance is 1 μ H.
Furthermore it is preferred that structure be that the maximum voltage of the output port of camera module test platform output is 10V；The
The resistance of one resistance is 55K Ω；The resistance of second resistance is 10K Ω.
Additionally, it is preferred that structure be that the capacity of the capacity of the first electric capacity and the second electric capacity is respectively 20-25 μ F；3rd electricity
The capacity of appearance, the 4th electric capacity and the 5th electric capacity is respectively 9-12 μ F；The capacity of the 6th electric capacity is 0.07-0.2 μ F；The inductance of inductance
It is 0.8-1.3 μ H to measure.
Furthermore, preferred structure is that the capacity of the capacity of the first electric capacity and the second electric capacity is respectively 22 μ F；3rd electric capacity,
The capacity of the 4th electric capacity and the 5th electric capacity is respectively 10 μ F；The capacity of the 6th electric capacity is 0.1 μ F；The inductance value of inductance is 1 μ H.
Using the above-mentioned reduction voltage circuit according to camera module test platform of the present utility model, shooting head mould can be replaced
Low pressure difference linear voltage regulator in group test platform, camera module institute is down to by the voltage that camera module test platform is exported
Required voltage, and the voltage after step-down is delivered to camera module, therefore, low pressure difference linear voltage regulator will not produce larger
Voltage difference, would not also cause its caloric value excessive and close camera module test platform.
Brief description of the drawings
By reference to the explanation below in conjunction with accompanying drawing, and it is more fully understood from to of the present utility model, this practicality is new
Other purposes and result of type will be more apparent and should be readily appreciated that.In the accompanying drawings：
Fig. 1 is that the circuit structure of the reduction voltage circuit of the camera module test platform according to the utility model embodiment is illustrated
Figure.
Reference therein includes：Camera module test platform 1, low pressure difference linear voltage regulator LDO, camera module
2nd, step-down chip Chip, inductance L, the first electric capacity C1, the second electric capacity C2, the 3rd electric capacity C3, the 4th electric capacity C4, the 5th electric capacity C5,
6th electric capacity C6, first resistor R1, second resistance R2.
Specific embodiment
In the following description, for purposes of illustration, in order to provide the comprehensive understanding to one or more embodiments, explain
Many details are stated.It may be evident, however, that these embodiments can also be realized in the case of without these details.
In other examples, for the ease of describing one or more embodiments, known structure and equipment show in block form an.
Fig. 1 shows the circuit knot of the reduction voltage circuit of the camera module test platform according to the utility model embodiment
Structure.
As shown in figure 1, the reduction voltage circuit of the camera module test platform that the utility model is provided, is connected to shooting head mould
Between group test platform 1 and camera module 2, for being depressured to the voltage that camera module test platform 1 is exported, will take the photograph
Transmitted to camera module 2 after voltage needed for being down to camera module 2 as the voltage that head module test platform 1 is exported.
Low pressure difference linear voltage regulator LDO in camera module test platform 1 can be exported to camera module test platform 1
Voltage carries out one-level step-down, but the amplitude of step-down can not be excessive, then the reduction voltage circuit provided by the utility model is to low voltage difference
Voltage after linear voltage regulator LDO step-downs carries out two grades of step-downs, camera module 2 is finally delivered to, because low pressure difference linearity is steady
The Amplitude of Hypotensive of depressor LDO can not be excessive, can't produce very big voltage difference, therefore, the hair of low pressure difference linear voltage regulator LDO
Heat is not too large, and the overheat protector module of camera module test platform 1 will not start, and shooting head mould is not turned off naturally also
Group test platform 1.
The maximum voltage of the output port output of usual camera module test platform 1 is 10V.
For example：The voltage of the output of camera module test platform 1 is 10V, by low pressure difference linear voltage regulator LDO by 10V
Voltage is down to 9V, then 9V voltages are down into 2.5V by reduction voltage circuit.
Specifically, the reduction voltage circuit of camera module test platform includes：Step-down chip 3, inductance L, the first electric capacity C1, the
Two electric capacity C2, the 3rd electric capacity C3, the 4th electric capacity C4, the 5th electric capacity C5, the 6th electric capacity C6, first resistor R1 and second resistance R2.
Step-down chip Chip includes 1-6 pins, wherein, the 1 pin ground connection of step-down chip Chip access power cathode；
2 pins of step-down chip Chip are connected with one end of inductance L, the other end of inductance L and the control source port of camera module 2
Connection；3 pins of step-down chip Chip and the output port of the mesolow difference linear constant voltage regulator LDO of camera module test platform 1；
5 pins of step-down chip Chip also connect with the output port of the mesolow difference linear constant voltage regulator LDO of camera module test platform 1
Connect；6 pins of step-down chip Chip are connected with a lateral electrode of the 6th electric capacity C6, and the electrode of the 6th electric capacity C6 opposite sides is connected to
On circuit between 2 pins of inductance L and step-down chip Chip.
From camera module 2 to the direction of inductance L, a lateral electrode of the first electric capacity C1 and the second electric capacity C2 is connected in turn
On circuit between the control source port of camera module 2 and inductance L, the opposite side electricity of the first electric capacity C1 and the second electric capacity C2
Pole is grounded respectively, that is, access power cathode.
From 3 pin of step-down chip Chip to the direction of camera module test platform 1, the 3rd electric capacity C3, the 4th electric capacity C4
It is defeated with camera module test platform 1 with 3 pins that a lateral electrode of the 5th electric capacity C5 is connected to step-down chip Chip in turn
On the circuit gone out between end, the 3rd electric capacity C3, another lateral electrode of the 4th electric capacity C4 and the 5th electric capacity C5 are grounded respectively, that is, access
Power cathode.
One end of first resistor R1 is connected with the control source port of camera module 2, the other end of first resistor R1 with
The 4 pins connection of step-down chip Chip.
Power cathode is accessed in one end of second resistance R2, and the other end and 4 pins of step-down chip Chip of second resistance connect
Connect.
In above-mentioned reduction voltage circuit, the first electric capacity C6 of electric capacity C1 to the 6th play a part of steady voltage, and inductance L is played
The effect of energy storage, first resistor R1 and second resistance R2 play a part of partial pressure.
In the utility model, first resistor R1 and second can be selected according to the voltage required for camera module 2
The resistance of resistance R2, so as to carry out being down to camera module 2 voltage that the output port of camera module test platform 1 is exported
Required voltage.
In the utility model, VFB (voltage feedback) voltage of 4 pin of step-down chip Chip is 0.768V,
According to output voltage Vout (output voltage Vout be camera module required for voltage) computing formula be：
Vout=0.768* (1+R1/R2)；
Can be drawn from above-mentioned formula, can be defeated to change by adjusting the resistance value ratio of first resistor R1 and second resistance R2
Go out voltage Vout.
For example：When output voltage Vout is 2.5V, R1/R2=2.2 may be selected R1=22k Ω, R2=10k Ω, also may be used
Selection R1=25k Ω, R2=11k Ω, as long as the resistance of first resistor R1 meets R1/R2=2.2 with the resistance of second resistance R2
.
Again for example：When output voltage Vout is 5V, R1/R2=5.5 may be selected R1=55k Ω, R2=10k Ω, also may be used
Selection R1=82.5K Ω, R2=15K Ω, as long as the resistance of first resistor R1 meets R1/R2=with the resistance of second resistance R2
5.5.
When output voltage Vout is other volts, the selection of the resistance of first resistor R1 and the resistance of second resistance R2
Can similarly obtain.
In addition, in a specific embodiment of the present utility model, the capacity of the first electric capacity C1 and the second electric capacity C2's
Capacity is respectively 20-25 μ F；3rd electric capacity C3, the capacity of the 4th electric capacity C4 and the 5th electric capacity C5 are respectively 9-12 μ F；6th electricity
The capacity for holding C6 is 0.07-0.2 μ F；The inductance value of inductance L is 0.8-1.3 μ H.
In a preferred embodiment of the present utility model, the capacity point of the capacity of the first electric capacity C1 and the second electric capacity C2
You Xuanwei not 22 μ F；3rd electric capacity C3, the capacity of the 4th electric capacity C4 and the 5th electric capacity C5 are respectively preferably 10 μ F；6th electric capacity C6
Capacity be preferably 0.1 μ F；The inductance value of inductance is preferably 1 μ H
The circuit structure of the reduction voltage circuit of the camera module test platform that the above is provided the utility model is carried out
Detailed description, it can be deduced that, the low pressure difference linear voltage regulator LDO in camera module test platform 1 only need to be right by a small margin
Voltage carries out one-level step-down, and significantly two grades of step-down work are completed by reduction voltage circuit, so that it is steady to limit low pressure difference linearity
Depressor LDO produces larger voltage difference, so as to ensure that the caloric value of low pressure difference linear voltage regulator LDO is unlikely to excessive.
The above, specific embodiment only of the present utility model, but protection domain of the present utility model do not limit to
In this, any one skilled in the art can readily occur in change in the technical scope that the utility model is disclosed
Or replace, should all cover within protection domain of the present utility model.Therefore, protection domain of the present utility model should be described with power
The protection domain that profit is required is defined.
Claims (7)
1. a kind of reduction voltage circuit of camera module test platform, be connected to camera module test platform and camera module it
Between, it is characterised in that including：Step-down chip, inductance, the first electric capacity, the second electric capacity, the 3rd electric capacity, the 4th electric capacity, the 5th electricity
Appearance, the 6th electric capacity, first resistor and second resistance, wherein,
1 pin of the step-down chip accesses power cathode；
2 pins of the step-down chip are connected with one end of the inductance, the other end of the inductance and the camera module
Control source port connection；
From the camera module to the direction of the inductance, one end of first electric capacity and second electric capacity is sequentially connected
On circuit between the control source port of the camera module and the inductance, first electric capacity and it is described second electricity
The other end of appearance is respectively connected to the power cathode；
3 pins of the step-down chip are connected to the output port of the camera module test platform；
One end of 3rd electric capacity, the 4th electric capacity and the 5th electric capacity is connected to 3 drawing for the step-down chip
On circuit between the output end of pin and the camera module test platform, the 3rd electric capacity, the 4th electric capacity and institute
The other end for stating the 5th electric capacity is respectively connected to the power cathode；
One end of the first resistor is connected with the control source port of the camera module, a termination of the second resistance
Enter the power cathode, the other end of the other end of the first resistor and the second resistance respectively with the step-down chip
4 pins are connected；
5 pins of the step-down chip are connected with the output port of the camera module test platform；
6 pins of the step-down chip are connected with one end of the 6th electric capacity, and the other end of the 6th electric capacity is connected to institute
State on the circuit between 2 pins of inductance and the step-down chip.
2. the reduction voltage circuit of camera module test platform as claimed in claim 1, it is characterised in that
The maximum voltage of the output port output of the camera module test platform is 10V；
The resistance of the first resistor is 25K Ω；
The resistance of the second resistance is 11K Ω.
3. the reduction voltage circuit of camera module test platform as claimed in claim 2, it is characterised in that
The capacity of first electric capacity is respectively 20-25 μ F with the capacity of second electric capacity；
3rd electric capacity, the 4th electric capacity are respectively 9-12 μ F with the capacity of the 5th electric capacity；
The capacity of the 6th electric capacity is 0.07-0.2 μ F；
The inductance value of the inductance is 0.8-1.3 μ H.
4. the reduction voltage circuit of camera module test platform as claimed in claim 3, it is characterised in that
The capacity of first electric capacity is respectively 22 μ F with the capacity of second electric capacity；
3rd electric capacity, the 4th electric capacity are respectively 10 μ F with the capacity of the 5th electric capacity；
The capacity of the 6th electric capacity is 0.1 μ F；
The inductance value of the inductance is 1 μ H.
5. the reduction voltage circuit of camera module test platform as claimed in claim 1, it is characterised in that
The maximum voltage of the output port output of the camera module test platform is 10V；
The resistance of the first resistor is 55K Ω；
The resistance of the second resistance is 10K Ω.
6. the reduction voltage circuit of camera module test platform as claimed in claim 5, it is characterised in that
The capacity of first electric capacity is respectively 20-25 μ F with the capacity of second electric capacity；
3rd electric capacity, the 4th electric capacity are respectively 9-12 μ F with the capacity of the 5th electric capacity；
The capacity of the 6th electric capacity is 0.07-0.2 μ F；
The inductance value of the inductance is 0.8-1.3 μ H.
7. the reduction voltage circuit of camera module test platform as claimed in claim 6, it is characterised in that
The capacity of first electric capacity is respectively 22 μ F with the capacity of second electric capacity；
3rd electric capacity, the 4th electric capacity are respectively 10 μ F with the capacity of the 5th electric capacity；
The capacity of the 6th electric capacity is 0.1 μ F；
The inductance value of the inductance is 1 μ H.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621354519.0U CN206237305U (en) | 2016-12-09 | 2016-12-09 | The reduction voltage circuit of camera module test platform |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621354519.0U CN206237305U (en) | 2016-12-09 | 2016-12-09 | The reduction voltage circuit of camera module test platform |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206237305U true CN206237305U (en) | 2017-06-09 |
Family
ID=58991973
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621354519.0U Active CN206237305U (en) | 2016-12-09 | 2016-12-09 | The reduction voltage circuit of camera module test platform |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206237305U (en) |
-
2016
- 2016-12-09 CN CN201621354519.0U patent/CN206237305U/en active Active
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20201012 Address after: 261031 north of Yuqing street, east of Dongming Road, high tech Zone, Weifang City, Shandong Province (Room 502, Geer electronic office building) Patentee after: GoerTek Optical Technology Co.,Ltd. Address before: 266100 Qingdao, Laoshan District, North House Street investment service center room, Room 308, Shandong Patentee before: GOERTEK TECHNOLOGY Co.,Ltd. |
|
| TR01 | Transfer of patent right |