CN206060348U - Power supply switch circuit - Google Patents
Power supply switch circuit Download PDFInfo
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- CN206060348U CN206060348U CN201621046985.2U CN201621046985U CN206060348U CN 206060348 U CN206060348 U CN 206060348U CN 201621046985 U CN201621046985 U CN 201621046985U CN 206060348 U CN206060348 U CN 206060348U
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Abstract
A kind of power supply switch circuit, it is adaptable to electrical connection load, and include the first controller, a second controller and a comparator；First voltage is converted to driving voltage and is exported to the load by first controller, and allows the first electric current Jing itself to flow to the load；The second controller includes first end, the second end and control end, the comparator produces a control signal according to the magnitude relationship between critical voltage and the driving voltage, whether the control end of the second controller receives control signal to control to turn between first end and the second end, and when the first end and the first end are turned on, second voltage is converted to the driving voltage and is exported to the load by second controller, and allows the second electric current Jing itself to flow to load.
Description
Technical field
This utility model relates to a kind of switching circuit, particularly relates to a kind of power supply for supplying electrical power to load and cuts
Change circuit.
Prior art
In 3C industries now, display floater is often carried on many electronic products is used to show various information that common to be aobvious
Show, and so-called display drives and integrates (Display Driver
Integration, DDI) circuit is often packaged in display floater and drives in IC, for driving display floater, that is, provide electric energy to
Pixel in the display floater.
The resolution of display floater is related to the quantity of pixel, and resolution is higher, and the quantity for representing pixel is more, also represents
The picture effect is presented by the display floater is better, and with the progress and development of science and technology, display floater constantly divides toward higher
Resolution develops, however, the resolution of display floater is higher, more represents and drives electric energy needed for the display floater bigger, therefore, how
Environmental protection and energy-conservation are taken into account while display floater efficiency is lifted, the important topic shown for design when driving integrated circuit is become
One of.
Refering to Fig. 1, the display floater driver element 91 of prior art can receive the first power supply from system unit 92
First voltage IOVCC, and second voltage VCI of second source, have a voltage conversion inside display floater driver element 91
First voltage IOVCC and the blood pressure lowering of second voltage VCI can be converted into driving voltage VDDD by circuit, the voltage conversion circuit respectively,
And the display floater driver element 91 is to drive display floater 93 with driving voltage VDDD.For example, if the first voltage
IOVCC is 1.8 volts, and second voltage VCI is 3 volts, and driving voltage VDDD is 1.6 volts, display floater driver element 91
Voltage conversion circuit be framework using linear voltage regulator (Linear regulator), to by after input voltage blood pressure lowering again
Row output, the Amplitude of Hypotensive of the voltage conversion circuit are bigger, the conversion efficiency of blood pressure lowering can be made poorer, according to the number of aforementioned citing
Value, second voltage VCI is converted to driving voltage VDDD needs 1.4 volts of blood pressure lowering, and first voltage IOVCC is converted to driving electricity
Pressure VDDD only need 0.2 volt of blood pressure lowering, so by the conversion efficiency that second voltage VCI is converted to driving voltage VDDD can be worse than by
First voltage IOVCC is converted to the efficiency of driving voltage VDDD, however, the second maximum current that second source can be provided
I2max is greater than the first maximum current I1max that the first power supply can be provided, and the maximum current that power supply can be provided is bigger, generation
Table can be supplied to the energy of load more, therefore second source has preferable driving force compared with the first power supply.That is,
The conversion efficiency of the first power supply is good, but driving force is weaker, and the conversion efficiency of second source is poor, but driving force is stronger, and
When display floater 93 needs larger electric energy, depend the first power supply alone and enough driving forces cannot be provided, it is therefore necessary to allow
Two power supplys and the first power supply are powered simultaneously, and make second source tie down overall conversion efficiency, therefore still suffer from obvious shortcoming.
The content of the invention
Therefore, the purpose of this utility model, that is, provide a kind of power supply switching electricity for taking into account driving force and conversion efficiency
Road.
Then, this utility model power supply switch circuit is applied to and is electrically connected to the first power supply, second source, and load
Between input connection end, to provide driving voltage to the input connection end；Power supply switch circuit includes the first controller, the second control
Device processed, and the second comparator；First voltage from the first power supply is converted to driving voltage and is exported to negative by the first controller
The input connection end of load, and allow itself to flow into input connection end from the first electric current Jing of the first power supply；Second controller
Including the first end for electrically connecting the second source, the second end of the input connection end for electrically connecting the load, and the second control end,
Second control end receives second control signal for being relevant to the driving voltage to control between first end and the second end to be
No conducting, when turning between first end and the second end, first end receives the second voltage from second source, second controller
Second voltage is converted to into driving voltage and the second end is output in, and allow from the second electric current Jing of the second source itself
Flow into the input connection end of load；Second comparator includes that the second of the second control end of an electrical connection second controller is compared
Outfan, the second comparator are according to magnitude relationship the second control signal of generation between the second critical voltage and driving voltage and defeated
Compare outfan for second.
In certain embodiments, when the second comparator judges driving voltage less than the second critical voltage, second controller
Second control end controls to turn between first end and the second end according to the second control signal.
In certain embodiments, the first controller includes electrically connecting the first end of first power supply, electrically connects the load
Second end of input connection end, and the first control end, the first control end receive the first control letter for being relevant to the driving voltage
Number with control the first controller first end and the second end between turn on or be not turned on；The power supply switch circuit is also comprising the first ratio
Compared with device, the first comparator includes that electrically connecting the first of the first control end of the first controller compares outfan, first comparator
First control letter is produced according to the magnitude relationship between first critical voltage and driving voltage more than the second critical voltage
Number and be output in first and compare outfan；When first comparator judges driving voltage more than the first critical voltage, the first controller
The first control end control to be not turned between first end and the second end according to the first control signal.
In certain embodiments, load is the display floater comprising multiple liquid crystal capacitances, and allows driving current inflow to be somebody's turn to do
Input connection end, to charge to liquid crystal capacitance, and driving current be the first electric current or the first electric current and the second electric current and.
Effect of the present utility model is：By the second comparator according to big between the second critical voltage and driving voltage
Little relation produces second control signal, and the second control end receives the second control signal to control the first end of second controller
And second turn on or be not turned between end, when the load can be made to need larger electric energy, second source just participates in powering, and has preferable
Driving force, if the load only needs small electric energy, only powered by first power supply, and can have preferable conversion efficiency.
Description of the drawings
Other features of the present utility model and effect, will clearly be presented in the embodiment with reference to schema, wherein：
Fig. 1 is circuit diagram, illustrates that the display floater driver element of prior art is electrically connected to system unit and display
Between panel；
Fig. 2 is the circuit diagram of one embodiment electrical connection load of this utility model power supply switch circuit；And
When Fig. 3 is that the embodiment is electrically connected between the first power supply, second source and the load, load current is relevant to
Schematic diagram.
Reference numeral explanation
1 first controller
11 first ends
12 second ends
13 first control ends
2 first comparators
21 positive input terminals
22 negative input ends
23 first compare outfan
3 second controllers
31 first ends
32 second ends
33 second control ends
4 second comparators
41 positive input terminals
42 negative input ends
43 second compare outfan
5 loads
51 input connection ends
52 liquid crystal capacitances
IOVCC first voltages
VCI second voltages
VDDD driving voltages
The first critical voltages of V1
The second critical voltages of V2
The first control signals of VG1
The second control signals of VG2
Iload driving currents
The first electric currents of I1
The second electric currents of I2
[specific embodiment]
Refering to Fig. 2, one embodiment of this utility model power supply switch circuit be applied to be electrically connected to the first power supply, second
Between power supply, and the input connection end 51 of load 5, first power supply has first voltage IOVCC and can provide the first electric current
I1, the second source have second voltage VCI and can provide the second electric current I2.In the present embodiment, the load 5 is, for example, one
Display floater, and include multiple liquid crystal capacitances 52 (Fig. 2 only illustrates one of them), but is not limited thereto, and the first power supply and
Second source is in order liquid crystal capacitance 52 to be charged through the power supply switch circuit, so that display floater shows correct bright
Degree, more specifically：The input connection end 51 of the load 5 receives the drive for being relevant to first voltage IOVCC and second voltage VCI
Galvanic electricity presses VDDD, and allows driving current Iload to flow into itself, and to charge to liquid crystal capacitance 52, and driving current Iload is
First electric current I1 or the first electric current I1 and the second electric current I2's and.In the present embodiment, first voltage IOVCC is, for example, 1.8 volts
Spy, second voltage VCI are, for example, 3 volts, and the rated value of driving voltage VDDD is then 1.6 volts, but are not limited thereto.
The power supply switch circuit includes a second controller 3 and of first comparator 2, of the first controller 1,
Individual second comparator 4.
First controller 1 includes the input of a 11, electrical connection load 5 of first end for electrically connecting first power supply
Second end 12 of connection end 51, and the first control end 13, the first control end 13 receive and are relevant to the first of driving voltage VDDD
Control signal VG1 with control the first controller 1 first end 11 and the second end 12 between turn on or be not turned on, when first end 11 and
When turning between the second end 12, first end 11 receives first voltage IOVCC, and first voltage IOVCC is converted to by the first controller 1
Driving voltage VDDD and export to the second end 12, and allow the first electric current I1 Jing itself to flow into the input connection end 51 of load 5,
Charged with the liquid crystal capacitance 52 to load 5.In the present embodiment, the first controller 1 is a p-type reinforced metal oxide half
Conductor field-effect transistor (Enhancement Type Metal-Oxide-Semiconductor Field-Effect
Transistor), and saturation region (Saturation Region), therefore first end 11 and the second end 12 are operated in when turning on
Between can form voltage difference, and the voltage difference is equal to the difference of first voltage IOVCC and driving voltage VDDD.
The first comparator 2 includes the input connection end 51 for electrically connecting the load 5 to receive the just defeated of driving voltage VDDD
Enter end 21, receive the negative input end 22 of the first critical voltage V1 inputs and electrically connect the first control end 13 of first controller 1
First compare outfan 23, first comparator 2 is according to the magnitude relationship between the first critical voltage V1 and driving voltage VDDD
The first control signal VG1 is produced, and the first control signal VG1 is output in into first and compare outfan 23, specifically, when first
When comparator 2 judges that driving voltage VDDD is less than the first critical voltage V1, the first control signal VG1 that first comparator 2 is produced
First control end 13 of the first controller 1 is made to control to turn between first end 11 and the second end 12, conversely, working as first comparator 2
When judging that driving voltage VDDD is more than the first critical voltage V1, the first control signal VG1 that first comparator 2 is produced makes the first control
It is not turned between the control first end 11 of first control end 13 of device processed 1 and the second end 12.
In the present embodiment, the first critical voltage V1 is 1.65 volts, but is not limited thereto, when driving voltage VDDD it is low
When the first critical voltage V1, first comparator 2 compares outfan 23 first and exports a low-voltage, so that the first controller
Turn between 1 first end 11 and the second end 12, and when driving voltage VDDD is higher than the first critical voltage V1, first comparator
2 compare outfan 23 first exports a high voltage, so as to not lead between the first end 11 of the first controller 1 and the second end 12
Logical, supplementary notes are：Unless the first power supply or the first controller 1 break down, otherwise driving voltage VDDD should be maintained always
In below the first critical voltage V1, that is to say, that the function of first comparator 2 is to make an overvoltage protection controller, prevents different
Normal high voltage causes damage to the load 5.
The second controller 3 includes the first end 31 for electrically connecting the second source, the input connection end for electrically connecting the load 5
51 the second end 32, and the second control end 33, the second control end 33 receive one and are relevant to the second of driving voltage VDDD
Control signal VG2 with control the second controller 3 first end 31 and the second end 32 between turn on or be not turned on, when first end 31
And second when turning between end 32, first end 31 receives second voltage VCI, and second voltage VCI is converted to drive by second controller 3
Galvanic electricity is pressed VDDD and driving voltage VDDD is output in the second end 32, and allows the second electric current I2 Jing itself to flow into load 5
Input connection end 51.Similar, second controller 3 is p-type EMOS enhancement metal oxide semiconductor field-effect transistor, and when turning on
Also operate in saturation region, therefore one between first end 31 and the second end 32, can be formed and be equal to second voltage VCI and driving voltage
The voltage difference of the difference of VDDD.
Supplementary notes be：For the present embodiment, first voltage IOVCC is 1.8 volts, second voltage VCI is 3 volts
Spy, driving voltage VDDD are 1.6 volts, and first voltage IOVCC and second voltage VCI be respectively by the first controller 1 and
Second controller 3 is depressurized into driving voltage VDDD, therefore, when the first controller 1 is turned on, between first end 11 and the second end 12
Across voltage difference be 0.2 volt the voltage difference of driving voltage VDDD (first voltage IOVCC with), and second controller 3 is turned on
When, between first end 31 and the second end 32 across voltage difference then for 1.4 volts (second voltage VCI and driving voltage VDDD's
Voltage difference), thus, it is supposed that the first controller 1 and second controller 3 are all turned on, and the first electric current I1 and the second electric current I2 are equal
When, the power consumed by second controller 3 is seven times of the first controller 1, therefore the conversion efficiency of the second source is worse than
One power supply.
Second comparator 4 includes the input connection end 51 for electrically connecting load 5 to receive the positive input terminal of driving voltage VDDD
41st, the second of the second control end 33 of the negative input end 42 of the second critical voltage V2 of acceptance inputs and electrical connection second controller 3
Compare outfan 43, the second comparator 4 is produced according to the magnitude relationship between the second critical voltage V2 and driving voltage VDDD
Second control signal VG2 and the second control signal VG2 is output in into second compares outfan 43, i.e., when second comparator 4 is sentenced
When the driving voltage VDDD of breaking is less than second critical voltage V2, the second control signal VG2 that second comparator 4 is produced makes the
Second control end 33 of two controllers 3 controls to turn between the first end 31 of the second controller 3 and the second end 32, conversely, working as
When second comparator 4 judges that driving voltage VDDD is more than the second critical voltage V2, the second control signal that the second comparator 4 is produced
VG2 makes to be not turned between the first end 31 of the control second controller 3 of the second control end 33 of second controller 3 and the second end 32.
In the present embodiment, the second critical voltage V2 is 1.58 volts, but is not limited thereto, as driving voltage VDDD
During less than the second critical voltage V2, the second comparator 4 compares outfan 43 second and exports a low-voltage, so that the second control
The first end 31 of device 3 and the second end 32 turn on, and when driving voltage VDDD is higher than the second critical voltage V2, the second comparator 4
Compare outfan 43 second and export a high voltage, so that the first end 31 of second controller 3 and the second end 32 are not turned on.Tool
For body, when loading 5 and consuming larger power and be in heavily loaded pattern, driving current Iload is larger, and the driving voltage
VDDD can decline with the increase of driving current Iload, in other words, when driving voltage VDDD drops to the second critical electricity
During pressure below V2, that is, representing load 5 needs larger electric energy in heavily loaded pattern, therefore, the second comparator 4 makes the second control
Device 3 is turned on, and second source is added with the first power supply and supplied electricity to jointly load 5, to provide to loading 5 enough driving energies
Power, and when loading 5 and only consuming small-power and be in light-load mode, driving current Iload is less, therefore driving voltage VDDD
More than the second critical voltage V2 is maintained, then the second comparator 4 will be not turned on will second controller 3, therefore only the first power supply
Load 5 is powered, to maintain preferable conversion efficiency, and effect of energy-conservation is reached.
Supplementary notes be：For the load 5 connected with the present embodiment is as display floater, what the display floater was consumed
Power is relevant to the picture shown by which, it is illustrated that：The first electric current I1 maximum quilts that first power supply can be provided
It is set as 20mA, therefore represents when driving current Iload is more than 20mA, driving voltage VDDD can drops to the second critical electricity
Pressure below V2, and turn on second controller 3.Coordinate refering to Fig. 3, when display floater shows the such as sprite such as white or completely black entirely
When, it is that in light-load mode, now driving current Iload is less than 20mA, therefore only by needed for the first power supply can provide load 5
Electric energy, to obtain preferable conversion efficiency.When display floater shows a trellis and black and white chessboard picture staggeredly
(checkerboard), when, it is that now driving current Iload is, for example, 50mA in heavily loaded pattern, more than the first power supply institute
The maximum of the first electric current I1 that can be provided, therefore, in heavily loaded pattern, it is to be powered by the first power supply and second source jointly,
To provide to loading 5 enough driving forces, and now the first electric current I1 is 20mA, and the second electric current I2 is then 30mA.And when aobvious
When showing the general picture of Display panel landscape or portrait etc., it is that now the size of driving current Iload is to be situated between in middle load pattern
Between light-load mode and heavily loaded pattern, and if driving current Iload is less than the maximum of the first electric current I1, just only by first
Power supply is powered, if driving current Iload is greater than the maximum of the first electric current I1, second source is added and the first power supply
It is common to power.
It should be noted that：Above-mentioned mentioned voltage or current value, merely to auxiliary understands the running side of the present embodiment
Formula, not for restriction scope of the present utility model.
In sum, this utility model power supply switch circuit receives driving voltage VDDD by second comparator 4, and
Turn on or be not turned on, energy according to the magnitude relationship control second controller 3 between driving voltage VDDD and the second critical voltage V2
Determine whether second source participates in supplying power to the load 5, therefore, load 5 in heavily loaded pattern when, the first power supply and second source
Can power simultaneously, to provide enough driving forces, and load 5 in light-load mode when, then only powered with the first power supply, to obtain
Preferable conversion efficiency is obtained, therefore the purpose of this utility model can be reached really.
As described above, embodiment only of the present utility model, when can not with this limit this utility model enforcement
Scope, every simple equivalence changes made according to this utility model claim and patent specification content and modification,
All still belong in the range of this utility model patent covers.
Claims (4)
1. a kind of power supply switch circuit, it is adaptable to be electrically connected to first power supply, a second source and a load
Between input connection end, to provide driving voltage to being input into connection end；Power supply switch circuit is included：
First voltage from the first power supply is converted to driving voltage and is exported to the input connection of load by the first controller
End, and allow itself to flow into input connection end from the first electric current Jing of the first power supply；
Second controller, including an electrical connection second source first end, the of the input connection end of an electrical connection load
Two ends, and second control end, the second control end receive second control signal for being relevant to driving voltage to control
Whether turn between first end and the second end, when turning between first end and the second end, first end receives one from second
Second voltage is converted to driving voltage and is output in the second end by the second voltage of power supply, second controller, and is allowed from the
Second electric current Jing of two power supplys itself flows into the input connection end of the load；And
Second comparator, including the second control end of electrical connection second controller second compares outfan, the second comparator root
Produce the second control signal and be output in second according to the magnitude relationship between the second critical voltage and driving voltage and compare outfan.
2. power supply switch circuit as claimed in claim 1, wherein, when the second comparator judges that driving voltage is critical less than second
Voltage, the second control end of second controller control to turn between first end and the second end according to the second control signal.
3. power supply switch circuit as claimed in claim 2, wherein, the first controller includes electrically connecting the first of the first power supply
Hold, electrically connect the second end of the input connection end of the load, and the first control end, the first control end to receive and be relevant to driving electricity
First control signal of pressure with control the first controller first end and the second end between turn on or be not turned on；
Power supply switch circuit also includes first comparator, and first comparator includes the first control end of the first controller of electrical connection
First compares outfan, and first comparator is according to big between the first critical voltage and driving voltage more than the second critical voltage
Little relation produces the first control signal and is output in first and compares outfan；
When first comparator judges driving voltage more than the first critical voltage, the first control end of the first controller is according to the first control
It is not turned between signal control first end processed and the second end.
4. the power supply switch circuit as described in claims 1 to 3 any of which item, wherein, load is comprising multiple liquid crystal capacitances
Display floater, and allow driving current flow into input connection end, to charge to liquid crystal capacitance, and driving current is the first electric current
Or first electric current and the second electric current and.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621046985.2U CN206060348U (en) | 2016-09-09 | 2016-09-09 | Power supply switch circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621046985.2U CN206060348U (en) | 2016-09-09 | 2016-09-09 | Power supply switch circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206060348U true CN206060348U (en) | 2017-03-29 |
Family
ID=58371149
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621046985.2U Active CN206060348U (en) | 2016-09-09 | 2016-09-09 | Power supply switch circuit |
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| Country | Link |
|---|---|
| CN (1) | CN206060348U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109410817A (en) * | 2018-11-29 | 2019-03-01 | 昆山国显光电有限公司 | Power supply control apparatus and display device |
| CN110504741A (en) * | 2018-09-14 | 2019-11-26 | 深圳市文鼎创数据科技有限公司 | A kind of power supply switch circuit of smart card and smart card |
| WO2024103735A1 (en) * | 2022-11-15 | 2024-05-23 | 华为技术有限公司 | Apparatus, power supply control method, storage medium, and electronic device |
-
2016
- 2016-09-09 CN CN201621046985.2U patent/CN206060348U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110504741A (en) * | 2018-09-14 | 2019-11-26 | 深圳市文鼎创数据科技有限公司 | A kind of power supply switch circuit of smart card and smart card |
| CN109410817A (en) * | 2018-11-29 | 2019-03-01 | 昆山国显光电有限公司 | Power supply control apparatus and display device |
| WO2024103735A1 (en) * | 2022-11-15 | 2024-05-23 | 华为技术有限公司 | Apparatus, power supply control method, storage medium, and electronic device |
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