CN110445248A - A kind of standby usage power supply switch circuit and method - Google Patents
A kind of standby usage power supply switch circuit and method Download PDFInfo
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- CN110445248A CN110445248A CN201910803071.8A CN201910803071A CN110445248A CN 110445248 A CN110445248 A CN 110445248A CN 201910803071 A CN201910803071 A CN 201910803071A CN 110445248 A CN110445248 A CN 110445248A
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- power source
- voltage
- circuit
- backup power
- stablizer
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/30—Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
- Y04S20/20—End-user application control systems
Abstract
The present invention relates to a kind of standby usage power supply switch circuit and methods, belong to standby usage power supply handoff technique field, solve the problems, such as not can guarantee seamless connection existing for existing switching circuit and using sacrifice PCB surface product and chip pin caused by external capacitive.Backup power source access adjustable up-down pressure voltage-stablizer, the anti-reverse current circuit of backup power source are sequentially arranged in backup power source current supply circuit；Main power source access voltage-stablizer, the anti-reverse current circuit of main power source are sequentially arranged in main power source current supply circuit；CPU controls switch unit and is used for when needing backup power source to power, adjust the voltage quasi position of backup power source access adjustable up-down pressure voltage-stablizer, until the voltage quasi position after the anti-reverse current circuit of backup power source is higher than voltage quasi position of the main power source access voltage-stablizer after main power source puts adverse current circuit, switching is powered by the backup power source；It is also used to when needing main power source to power, is powered by backup power source power switching to main power source.
Description
Technical field
The present invention relates to standby usage power supply handoff technique field more particularly to a kind of standby usage power supply switch circuit and sides
Method.
Background technique
Existing external load, especially SoC chip system, it is higher and higher to the stability of power supply system, sustainable requests；
For power down will loss of data digital module, be more to ensure that stability, the duration of power supply；Therefore, general to require to supply
Power supply uses two-way even two-way or more.Under normal conditions, all the way to commonly use main power source, other roads are backup power source.Normally
When work, chip is system power supply by main power source, and when chip enters suspend mode, system automatically switches to backup power source power supply
To achieve the purpose that save data.
And in existing backup power source switching circuit, according to without external energy-storage travelling wave tube power supply circuit, it is easy to cause output
The violent jump of voltage；According to there is external energy-storage travelling wave tube power supply circuit (as increased external capacitive), although can be in certain journey
The jump of output voltage is prevented on degree, still, this mode can sacrifice the long-pending pin number with chip of external PCB surface, for
The load of chip-scale is simultaneously not suitable for.
Accordingly, it is desirable to provide a kind of circuit that can be switched between main power supply, can prevent the play of output voltage
Strong jump guarantees that seamless connection, power supply are sufficient and uninterrupted, while external PCB surface is long-pending and the number of pins of chip without sacrificing
Amount.
Summary of the invention
In view of above-mentioned analysis, the present invention is intended to provide a kind of standby usage power supply switch circuit, existing active and standby to solve
Acutely the jumping of the output voltage existing for switching circuit not can guarantee that seamless connection, not can guarantee power supply sufficient and uninterrupted
The problem of and stand-by circuit use and sacrifice the problem of external PCB surface is long-pending and the pin number of chip caused by external capacitive.
The purpose of the present invention is mainly achieved through the following technical solutions:
A kind of standby usage power supply switch circuit, comprising: backup power source access adjustable up-down presses voltage-stablizer, main power source access
The anti-reverse current circuit of voltage-stablizer, main power source, the anti-reverse current circuit of backup power source, CPU control switch unit；Wherein,
The backup power source access adjustable up-down pressure voltage-stablizer, the anti-reverse current circuit of the backup power source are sequentially arranged in standby
With in power supply current supply circuit；The main power source access voltage-stablizer, the anti-reverse current circuit of the main power source are sequentially arranged to be supplied in main power source
In electrical circuit；
The CPU controls switch unit, adjustable for when needing backup power source to power, adjusting the backup power source access
The voltage quasi position of buck voltage-stablizer is saved, until the voltage quasi position after the anti-reverse current circuit of backup power source is higher than the main power source
Voltage quasi position of the access voltage-stablizer after main power source puts adverse current circuit, switching are powered by the backup power source；Being also used to work as needs
When main power source being wanted to power, powered by backup power source power switching to main power source.
On the basis of above scheme, the present invention has also done following improvement:
Further, the CPU control switch unit adjusts the electricity of the backup power source access adjustable up-down pressure voltage-stablizer
After pressing level, start the anti-reverse current circuit of the backup power source；
After switching by backup power source power supply, stablizes to the backup power source supply voltage, close the main power source
Access voltage-stablizer, and the voltage quasi position of the backup power source access adjustable up-down pressure voltage-stablizer is adjusted, until passing through standby electricity
Voltage quasi position after the anti-reverse current circuit in source is lower than voltage of the main power source access voltage-stablizer after main power source puts adverse current circuit
Level.
Further, when being powered by backup power source power switching to main power source, the main power source access voltage-stablizer is opened, is led to
It crosses the main power source power supply and closes the backup power source access adjustable up-down pressure after the main power source supply voltage is stablized
Voltage-stablizer and the anti-reverse current circuit of backup power source.
Further, the backup power source access adjustable up-down pressure voltage-stablizer includes: Width funtion domain linear voltage-stabilizing circuit, electricity
Flat conversion circuit, voltage regulator circuit；Wherein,
The output end of the CPU control switch unit is connected with the input terminal of the level shifting circuit, and the level turns
The output end for changing circuit is connected with the input terminal of the voltage regulator circuit, the output end of the voltage regulator circuit and the width
The input terminal of voltage domain linear voltage-stabilizing circuit is connected；
The control signal that the voltage regulator circuit is used to control switch unit output according to the CPU adjusts intrinsic standoff ratio
Example, to adjust the electric current of voltage regulator circuit output end；
The electric current that Width funtion domain linear voltage-stabilizing circuit is inputted based on input terminal changes the voltage of output end；
The output end of Width funtion domain linear voltage-stabilizing circuit is connected with the backup power source counterflow-preventing circuit input end.
Further, Width funtion domain linear voltage-stabilizing circuit includes: band-gap reference circuit, operational amplifier, first switch
Metal-oxide-semiconductor, resistance R1；Wherein,
The backup power source output end respectively with the power end of band-gap reference circuit anode, the first switch MOS
The source electrode of pipe is connected；
The output end of the band-gap reference circuit connects the inverting input terminal of the operational amplifier；
The non-inverting input terminal of the operational amplifier connects one end of the resistance R1, the other end connection of the resistance R1
The drain electrode of the first switch metal-oxide-semiconductor, the output end of the operational amplifier connect the grid of the first switch metal-oxide-semiconductor；
The drain electrode of the first switch metal-oxide-semiconductor is the output end of Width funtion domain linear voltage-stabilizing circuit；
The non-inverting input terminal of the operational amplifier is the input terminal of Width funtion domain linear voltage-stabilizing circuit.
Further, the voltage regulator circuit includes second switch metal-oxide-semiconductor, resistance R2, resistance R3；
The grid of the second switch metal-oxide-semiconductor is connected with the output end of the level shifting circuit, the second switch MOS
The drain electrode of pipe is connected with the input terminal of Width funtion domain linear voltage-stabilizing circuit；The source electrode of the second switch metal-oxide-semiconductor is through electricity
It is grounded after resistance R3；
The both ends of the resistance R2 are connected with the source electrode of the second switch metal-oxide-semiconductor, drain electrode respectively.
Further, the circuit further includes backup power source electricity self-detection module, for detecting the electricity of the backup power source
Pressure, and will test result and be sent to the CPU control switch unit；When the voltage of backup power source is lower than voltage threshold, stop
It is powered using backup power source.
Further, the anti-reverse current circuit of the backup power source includes: third switch metal-oxide-semiconductor, the 4th switch metal-oxide-semiconductor, the 5th opens
Close metal-oxide-semiconductor；Wherein,
Source electrode, the described 4th grid for switching metal-oxide-semiconductor of the third switch metal-oxide-semiconductor are all connected with the main power voltage；
Grid, the described 4th source electrode for switching metal-oxide-semiconductor of the third switch metal-oxide-semiconductor are all connected with the backup power source cell voltage；Institute
State the substrate after third switch metal-oxide-semiconductor is connected with the drain electrode of the 4th switch metal-oxide-semiconductor, substrate with the 5th switch metal-oxide-semiconductor
It is connected；The drain electrode of the 5th switch metal-oxide-semiconductor is connected with the output end of Width funtion domain linear voltage-stabilizing circuit；Described 5th opens
The grid for closing metal-oxide-semiconductor is used to receive the switching signal of the CPU control switch unit；By the source electrode of the 5th switch metal-oxide-semiconductor
Output end as the anti-reverse current circuit of the backup power source is for connecting load.
Further, the voltage quasi position after the anti-reverse current circuit of the backup power source passes through higher than the main power source access voltage-stablizer
Main power source puts the voltage quasi position after adverse current circuit, comprising:
Higher than the 10%-15% of the main power source access stabilizer output voltage；
Voltage quasi position after the anti-reverse current circuit of backup power source passes through main power source lower than the main power source access voltage-stablizer
Voltage quasi position after putting adverse current circuit, comprising:
Lower than the 10%-15% of the main power source access stabilizer output voltage.
The present invention also provides a kind of standby usage power-supply switching method, this method is based on above-mentioned standby usage power supply switch circuit
It realizes, executes following operation inside CPU control switch unit:
It receives and parses through control instruction, detect current power supply state；Wherein, the control instruction is to be supplied using main power source
Electricity is powered using backup power source；
When the control instruction be using main power source power supply and current time backup power source do not power when, control pass through institute
State main power source power supply；
When the control instruction is using backup power source power supply and when current time main power source is being powered, described in unlatching
Backup power source access adjustable up-down presses voltage-stablizer, and the voltage for adjusting the backup power source access adjustable up-down pressure voltage-stablizer is quasi-
Position is put until the voltage quasi position after the anti-reverse current circuit of backup power source is higher than the main power source access voltage-stablizer by main power source
Voltage quasi position after adverse current circuit, and start the anti-reverse current circuit of the backup power source, switching is powered by the backup power source；To institute
It states backup power source supply voltage to stablize, closes the main power source access voltage-stablizer, and it is adjustable to adjust the backup power source access
The voltage quasi position of buck voltage-stablizer, until the voltage quasi position after the anti-reverse current circuit of backup power source is logical lower than the main power source
Voltage quasi position of the road voltage-stablizer after main power source puts adverse current circuit；
When the control instruction is using main power source power supply and when current time backup power source is being powered, described in unlatching
Main power source access voltage-stablizer, is powered by the main power source, is stablized to the main power source supply voltage, is closed the backup power source
Access adjustable up-down presses voltage-stablizer, and closes backup power source and put adverse current circuit.
The present invention has the beneficial effect that:
Standby usage power supply switch circuit provided by the invention and method are fed back by control and realize that backup power source access is adjustable
Save buck stabilizer output voltage buck pretreatment so that supply voltage there is no voltage jump, can achieve it is seamless
The requirement of formula power supply, while the linear energy-storage travelling wave tube outside piece is saved, without the long-pending number of pins with chip of PCB surface outside sacrificing
Amount；Meanwhile the Width funtion domain linear voltage-stabilizing circuit in adjustable up-down pressure voltage-stablizer meets backup power source road supply voltage and confession
The big requirement of piezoelectric voltage amplitude of variation；In addition, the anti-reverse current circuit in backup power source road in the present invention uses substrate switch designs, protect
No matter whether backup power source road has power supply to card, and switch can effectively work.
It in the present invention, can also be combined with each other between above-mentioned each technical solution, to realize more preferred assembled schemes.This
Other feature and advantage of invention will illustrate in the following description, also, certain advantages can become from specification it is aobvious and
It is clear to, or understand through the implementation of the invention.The objectives and other advantages of the invention can by specification, claims with
And it is achieved and obtained in specifically noted content in attached drawing.
Detailed description of the invention
Attached drawing is only used for showing the purpose of specific embodiment, and is not to be construed as limiting the invention, in entire attached drawing
In, identical reference symbol indicates identical component.
Fig. 1 is standby usage power supply switch circuit structural schematic diagram in the embodiment of the present invention 1；
Fig. 2 is the electrical block diagram that backup power source access adjustable up-down presses voltage-stablizer in the embodiment of the present invention 1；
Fig. 3 is backup power source counterflow-preventing electrical block diagram in the embodiment of the present invention 1；
Fig. 4 is to be respectively adopted without external energy-storage travelling wave tube, have backup power source switching circuit in external energy-storage travelling wave tube and the present invention
The voltage oscillogram of output.
Appended drawing reference:
1- backup power source electricity self-detection module；2- main power source；3- backup power source；4- main power source access voltage-stablizer；5- is standby
Voltage-stablizer is pressed with power path adjustable up-down；The anti-reverse current circuit of 6- main power source；The anti-reverse current circuit of 7- backup power source；8-CPU control
Switch unit processed；9- Width funtion domain linear voltage-stabilizing circuit；10- level shifting circuit；11- voltage regulator circuit；12- substrate is opened
It closes.
Specific embodiment
Specifically describing the preferred embodiment of the present invention with reference to the accompanying drawing, wherein attached drawing constitutes the application a part, and
Together with embodiments of the present invention for illustrating the principle of the present invention, it is not intended to limit the scope of the present invention.
Embodiment 1
A specific embodiment of the invention discloses a kind of standby usage power supply switch circuit, structural schematic diagram such as Fig. 1 institute
Show.The circuit includes: that backup power source access adjustable up-down presses voltage-stablizer (5), main power source access voltage-stablizer (4), main power source anti-
Adverse current circuit (6), the anti-reverse current circuit of backup power source (7), CPU control switch unit (8)；Wherein, the backup power source access can
Adjust buck voltage-stablizer, the anti-reverse current circuit of the backup power source is sequentially arranged in backup power source current supply circuit；The main electricity
Source access voltage-stablizer, the anti-reverse current circuit of the main power source are sequentially arranged in main power source current supply circuit；The CPU control switching is single
Member, for when needing backup power source to power, adjusting the voltage quasi position of the backup power source access adjustable up-down pressure voltage-stablizer,
Until voltage quasi position after the anti-reverse current circuit of backup power source be higher than the main power source access voltage-stablizer put by main power source it is inverse
Voltage quasi position after current circuit, switching power (3) by the backup power source；It is also used to when needing main power source to power, by spare
Power supply power supply switches to main power source (2) power supply.
When implementation, when needing backup power source to power, CPU controls switch unit and issues voltage up control signal, adjusts spare
Power path adjustable up-down presses the voltage quasi position of voltage-stablizer, until the voltage quasi position after the anti-reverse current circuit of backup power source is high
In voltage quasi position of the main power source access voltage-stablizer after main power source puts adverse current circuit, the preferably higher than described main power source access
The 10%-15% of stabilizer output voltage；Meanwhile CPU controls switch unit and issues starting letter to the anti-reverse current circuit of backup power source
Number, for starting the anti-reverse current circuit of the backup power source.Since backup power source access output voltage is higher than main power source access at this time
Therefore output voltage automatically switches to be powered by the backup power source (3) at this time；After backup power source supply voltage is stablized, close
The main power source access voltage-stablizer, and voltage down control signals are issued, and adjust backup power source access adjustable up-down pressure voltage-stablizer
Voltage quasi position, until voltage quasi position after the anti-reverse current circuit of backup power source passes through main electricity lower than main power source access voltage-stablizer
Put the voltage quasi position after adverse current circuit, the preferably shorter than 10%-15% of main power source access stabilizer output voltage in source；When needing to lead
When power supply power supply, main power source access voltage-stablizer is enabled, since main power source access output voltage is defeated higher than backup power source access at this time
Therefore voltage out is powered by backup power source power switching to main power source automatically at this time；Also, to the main power source supply voltage
After stabilization, the backup power source access adjustable up-down pressure voltage-stablizer is closed, backup power source counterflow-preventing circuit switch is simultaneously closed off；
When switching to backup power source power supply again, need to first turn on backup power source access adjustable up-down pressure voltage-stablizer, then
Voltage adjustment operations are executed again.
In standby usage power supply switch circuit provided in this embodiment, pre-processed by the buck of supply voltage, so that
Supply voltage is not present voltage jump, can achieve the requirement of gapless power supply, while saving the linear energy-storage travelling wave tube outside piece,
Without the long-pending pin number with chip of PCB surface outside sacrificing.
Generally, it needs to be supplied using main power source when load (such as chip and its peripheral load circuit) works normally
Electricity；And when it enters suspend mode, partial function deactivates, and can use backup power source at this time is powered, and can meet existing
The power demands (such as preservation data operation) of functional component.Specifically, when select main power source power supply, when select it is spare
The problem of power supply power supply, not within the scope of the considerations of the present invention program.Generally, when load is chip and its periphery load
When circuit, CPU can be controlled into switch unit and be directly arranged in the chip, without being individually for CPU control switch unit setting
Corresponding hardware configuration, to save PCB surface product.
Preferably, the circuit further includes backup power source electricity self-detection module (1), for monitoring the backup power source
Whether output voltage meets power reguirements, such as meets the requirements, and CPU control switch unit can enable backup power source access,
And it will test result and be sent to the CPU control switch unit；When the output voltage of backup power source is lower than voltage threshold, stop
It is powered using backup power source.
Preferably, the present embodiment gives the circuit structure of backup power source access adjustable up-down pressure voltage-stablizer, comprising:
Width funtion domain linear voltage-stabilizing circuit (9), level shifting circuit (10), voltage regulator circuit (11)；Wherein, the CPU control is cut
The output end for changing unit is connected with the input terminal of the level shifting circuit, the output end of the level shifting circuit and the electricity
The input terminal of voltage regulator circuit is connected, and the output end of the voltage regulator circuit is defeated with Width funtion domain linear voltage-stabilizing circuit
Enter end to be connected；The control signal that the voltage regulator circuit is used to control switch unit output according to the CPU adjusts intrinsic standoff ratio
Example, to adjust the electric current of voltage regulator circuit output end；The electricity that Width funtion domain linear voltage-stabilizing circuit is inputted based on input terminal
Stream, changes the voltage of output end；The output end and the anti-reverse current circuit of the backup power source of Width funtion domain linear voltage-stabilizing circuit
Input terminal be connected.Wherein, Width funtion domain linear voltage-stabilizing circuit includes: band-gap reference circuit, operational amplifier, first switch
Metal-oxide-semiconductor, resistance R1；Wherein, the backup power source output end respectively with the power end of band-gap reference circuit anode, described the
The source electrode of one switch metal-oxide-semiconductor is connected, for the source electrode power supply for band-gap reference circuit, first switch metal-oxide-semiconductor.The band-gap reference
The output end of circuit connects the inverting input terminal of the operational amplifier；Described in the non-inverting input terminal connection of the operational amplifier
One end of resistance R1, the other end of the resistance R1 connect the drain electrode of the first switch metal-oxide-semiconductor, the operational amplifier it is defeated
Outlet connects the grid of the first switch metal-oxide-semiconductor；The drain electrode of the first switch metal-oxide-semiconductor is Width funtion domain linear voltage stabilization
The output end of circuit；The non-inverting input terminal of the operational amplifier is the input terminal of Width funtion domain linear voltage-stabilizing circuit.Electricity
Voltage regulator circuit includes second switch metal-oxide-semiconductor, resistance R2；The grid and the level shifting circuit of the second switch metal-oxide-semiconductor
Output end be connected, resistance R3；The grid of the second switch metal-oxide-semiconductor is connected with the output end of the level shifting circuit, institute
The drain electrode for stating second switch metal-oxide-semiconductor is connected with the input terminal of Width funtion domain linear voltage-stabilizing circuit；The second switch MOS
The source electrode of pipe is grounded after resistance R3；The both ends of the resistance R2 respectively with the source electrode of the second switch metal-oxide-semiconductor, drain electrode phase
Even.
When CPU, which issues ascending, descending pressure signal, to be controlled backup power source access adjustable up-down pressure voltage-stablizer, due to
It is digital signal that signal is pressed in ascending, descending, and the brownout of digital signal, can not the analog circuit directly to high voltage device carry out
Control.Therefore, it is provided with level shifting circuit, digital low-voltage is converted by simulation high voltage by level shifting circuit.Electricity
Flat conversion circuit uses general Level-Shifter it is achieved that the analog signal after conversion can be adjusted voltage
Circuit is controlled.Voltage regulator circuit realized using the in parallel of switch MOS and resistance string, by the short circuit of control resistance string and
Conducting changes the resistance value of resistance string.Since resistance string resistance value changes, so that dividing ratios change, therefore, Width funtion domain line
The electric current of property voltage regulator circuit input terminal changes, and due to band-gap reference provides in the linear voltage-stabilizing circuit of Width funtion domain reference
Voltage is constant, both ends virtual short principle and negative-feedback principle is inputted using two-stage calculation amplifier, so that feeding back to resistance string
The voltage of tie point is constant.And resistance string dividing ratios change, the electric current for flowing through resistance R1 changes, and then the partial pressure on R1
It changes, the voltage of output end is finally made to change, to realize lifting press operation.The ratio of buck can be by changing
Resistance in power transformation voltage regulator circuit is realized.Preferably, operational amplifier can be two-stage calculation amplifier, this amplifier stage
The MOS of connection is less, and required total overdrive voltage is lower, is able to satisfy supply voltage is low in saturation region operation, to realize
Width funtion domain.Backup power source access adjustable up-down presses the electrical block diagram of voltage-stablizer as shown in Figure 2.
Preferably, the present embodiment gives backup power source counterflow-preventing electrical block diagram, as shown in Figure 3.The circuit
It include: third switch metal-oxide-semiconductor, the 4th switch metal-oxide-semiconductor, the 5th switch metal-oxide-semiconductor；By third switch metal-oxide-semiconductor, the 4th switch metal-oxide-semiconductor
Combination forms substrate switch (12).Wherein, the source electrode of the third switch metal-oxide-semiconductor, the described 4th grid for switching metal-oxide-semiconductor connect
Connect the main power voltage；Grid, the described 4th source electrode for switching metal-oxide-semiconductor of the third switch metal-oxide-semiconductor are all connected with described standby
With power-supply battery voltage；Third switch metal-oxide-semiconductor is connected afterwards and described the with the drain electrode of the 4th switch metal-oxide-semiconductor, substrate
The substrate of five switch metal-oxide-semiconductors is connected；The drain electrode and the output of Width funtion domain linear voltage-stabilizing circuit of the 5th switch metal-oxide-semiconductor
End is connected；The grid of the 5th switch metal-oxide-semiconductor is used to receive the switching signal of the CPU control switch unit；By described
The source electrode of five switch metal-oxide-semiconductors is loaded as the output end of the anti-reverse current circuit of the backup power source for connecting.Due to battery itself
Voltage is lower than supply voltage, if using the anti-reverse-current swithcs of the common diode in power supply road, since diode cross-pressure is excessive
(700mV) meeting can not be powered to supported chip so that last output voltage level is too low, so using special construction of switch,
The effect of the substrate switch of this structure is that the Body (substrate) that high level in battery or power is linked into switch MOS always is held,
Such that regardless of being battery power supply or power supply power supply, switch MOS is since the end Body is in maximum potential, so the equal energy of switch MOS
It works normally, and since this switch MOS cross-pressure is very low (being less than 200mV), meets battery road power reguirements, output end can be blocked
Backward current, also can guarantee backup power source be low-voltage battery when cross-pressure requirement.
Fig. 4 is respectively without external energy-storage travelling wave tube, has external energy-storage travelling wave tube, using buck of the present invention modulation nothing from top to bottom
When the cut-in stand-by power supply of energy-storage travelling wave tube, the voltage oscillogram of output.It can be seen that when without external energy-storage travelling wave tube, due to first
The active and standby road output voltage level that begins is equal, can not power, cause standby upon handover enabling in advance to spare road voltage-stablizer
Could start to power with voltage-stablizer, output voltage is caused to have a violent jump, output voltage be pulled to it is very low, if supplied at this time
Electricity can bring mistake to the output of subsequent conditioning circuit；When possessing the biggish external energy-storage travelling wave tube of capacitance, the nothing of external capacitive is utilized
Voltage jump characteristic effectively prevents the jump of output voltage, but can sacrifice the long-pending pin with chip of external PCB surface at this time
Quantity；And when the standby usage power supply switch circuit in application the present embodiment, boosting behaviour is carried out to spare road in advance in switching
Make, so that backup power source is powered in advance, and then prevent output voltage from jumping, achieve the purpose that seamless voltage-transition.
Embodiment 2
In the embodiment of the present invention 2, a kind of standby usage power-supply switching method is also disclosed, this method is based on above-mentioned active and standby
It is realized with power supply switch circuit, executes following operation inside CPU control switch unit:
Step S1: it receives and parses through control instruction, detect current power supply state；Wherein, the control instruction is to utilize
Main power source power supply is powered using backup power source.The control instruction is to be powered using main power source or powered using backup power source,
The time of control instruction sending, type can be designed as needed by user.For example, when working properly, the control instruction of sending
To be powered using main power source；When entering suspend mode, the control instruction of sending is to be powered using backup power source.
Step S2:
Step S21: when the control instruction be using main power source power supply and current time backup power source do not power when, control
System is powered by the main power source；
Step S22: when the control instruction be using backup power source power supply and current time main power source powering when,
The backup power source access adjustable up-down pressure voltage-stablizer is opened, the backup power source access adjustable up-down pressure voltage-stablizer is adjusted
Voltage quasi position, until voltage quasi position after the anti-reverse current circuit of backup power source is higher than main power source access voltage-stablizer process
Main power source puts the voltage quasi position after adverse current circuit, and starts the anti-reverse current circuit of the backup power source, switches by the backup power source
Power supply；Stablize to the backup power source supply voltage, close the main power source access voltage-stablizer, and it is logical to adjust the backup power source
The voltage quasi position of road adjustable up-down pressure voltage-stablizer drops back to the voltage quasi position lower than the main power source access voltage-stablizer, until passing through
Voltage quasi position after the anti-reverse current circuit of backup power source is lower than the main power source access voltage-stablizer after main power source puts adverse current circuit
Voltage quasi position；
Step S23: when the control instruction be using main power source power supply and current time backup power source powering when,
The main power source access voltage-stablizer is opened, is powered by the main power source, is stablized to the main power source supply voltage, described in closing
Backup power source access adjustable up-down presses voltage-stablizer, and closes backup power source and put adverse current circuit.
The specific implementation process of embodiment of the method is referring to foregoing circuit embodiment in the present invention, and the present embodiment is herein not
It repeats again.Since this method embodiment is identical as foregoing circuit embodiment principle, so this method also has foregoing circuit implementation
The corresponding technical effect of example.
It will be understood by those skilled in the art that realizing all or part of the process of above-described embodiment method, meter can be passed through
Calculation machine program is completed to instruct relevant hardware, and the program can be stored in computer readable storage medium.Wherein, institute
Stating computer readable storage medium is disk, CD, read-only memory or random access memory etc..
The foregoing is only a preferred embodiment of the present invention, but scope of protection of the present invention is not limited thereto,
In the technical scope disclosed by the present invention, any changes or substitutions that can be easily thought of by anyone skilled in the art,
It should be covered by the protection scope of the present invention.
Claims (10)
1. a kind of standby usage power supply switch circuit characterized by comprising backup power source access adjustable up-down pressure voltage-stablizer,
Main power source access voltage-stablizer, the anti-reverse current circuit of main power source, the anti-reverse current circuit of backup power source, CPU control switch unit；Wherein,
The backup power source access adjustable up-down pressure voltage-stablizer, the anti-reverse current circuit of the backup power source are sequentially arranged in standby electricity
In the current supply circuit of source；The main power source access voltage-stablizer, the anti-reverse current circuit of the main power source are sequentially arranged and power back in main power source
Lu Zhong；
The CPU controls switch unit, and for adjusting when needing backup power source to power, the backup power source access is adjustable to be risen
The voltage quasi position of voltage-releasing voltage stabilizer, until the voltage quasi position after the anti-reverse current circuit of backup power source is higher than the main power source access
Voltage quasi position of the voltage-stablizer after main power source puts adverse current circuit, switching are powered by the backup power source；It is also used to work as and needs to lead
When power supply power supply, powered by backup power source power switching to main power source.
2. standby usage power supply switch circuit according to claim 1, which is characterized in that the CPU controls switch unit tune
After the voltage quasi position for saving the backup power source access adjustable up-down pressure voltage-stablizer, start the anti-reverse current circuit of the backup power source；
After switching by backup power source power supply, stablizes to the backup power source supply voltage, close the main power source access
Voltage-stablizer, and the voltage quasi position of the backup power source access adjustable up-down pressure voltage-stablizer is adjusted, until anti-by backup power source
Voltage quasi position after adverse current circuit is lower than voltage quasi position of the main power source access voltage-stablizer after main power source puts adverse current circuit.
3. standby usage power supply switch circuit according to claim 2, which is characterized in that when by backup power source power switching extremely
When main power source is powered, the main power source access voltage-stablizer is opened, is powered by the main power source, to the main power source supply voltage
After stabilization, the backup power source access adjustable up-down pressure voltage-stablizer and the anti-reverse current circuit of backup power source are closed.
4. standby usage power supply switch circuit according to any one of claim 1-3, which is characterized in that the backup power source
It includes: Width funtion domain linear voltage-stabilizing circuit, level shifting circuit, voltage regulator circuit that access adjustable up-down, which presses voltage-stablizer,；Its
In,
The output end of the CPU control switch unit is connected with the input terminal of the level shifting circuit, the level conversion electricity
The output end on road is connected with the input terminal of the voltage regulator circuit, the output end of the voltage regulator circuit and the Width funtion
The input terminal of domain linear voltage-stabilizing circuit is connected；The voltage regulator circuit is used to control switch unit output according to the CPU
It controls signal and adjusts dividing ratios, to adjust the electric current of voltage regulator circuit output end；
The electric current that Width funtion domain linear voltage-stabilizing circuit is inputted based on input terminal changes the voltage of output end；
The output end of Width funtion domain linear voltage-stabilizing circuit is connected with the input terminal of the anti-reverse current circuit of the backup power source.
5. standby usage power supply switch circuit according to claim 4, which is characterized in that Width funtion domain linear voltage stabilization electricity
Road includes: band-gap reference circuit, operational amplifier, first switch metal-oxide-semiconductor, resistance R1；Wherein,
The backup power source output end respectively with the power end of band-gap reference circuit anode, the first switch metal-oxide-semiconductor
Source electrode is connected；
The output end of the band-gap reference circuit connects the inverting input terminal of the operational amplifier；
The non-inverting input terminal of the operational amplifier connects one end of the resistance R1, described in the other end connection of the resistance R1
The drain electrode of first switch metal-oxide-semiconductor, the output end of the operational amplifier connect the grid of the first switch metal-oxide-semiconductor；
The drain electrode of the first switch metal-oxide-semiconductor is the output end of Width funtion domain linear voltage-stabilizing circuit；
The non-inverting input terminal of the operational amplifier is the input terminal of Width funtion domain linear voltage-stabilizing circuit.
6. standby usage power supply switch circuit according to claim 4, which is characterized in that the voltage regulator circuit includes the
Two switch metal-oxide-semiconductors, resistance R2, resistance R3；
The grid of the second switch metal-oxide-semiconductor is connected with the output end of the level shifting circuit, the second switch metal-oxide-semiconductor
Drain electrode be connected with the input terminal of Width funtion domain linear voltage-stabilizing circuit；The source electrode of the second switch metal-oxide-semiconductor is through resistance R3
After be grounded；
The both ends of the resistance R2 are connected with the source electrode of the second switch metal-oxide-semiconductor, drain electrode respectively.
7. standby usage power supply switch circuit according to claim 1, which is characterized in that the circuit further includes backup power source
Electricity self-detection module for detecting the voltage of the backup power source, and will test result and be sent to the CPU control switching list
Member；When the voltage of backup power source is lower than voltage threshold, backup power source is stopped using to power.
8. standby usage power supply switch circuit according to claim 4, which is characterized in that the anti-reverse current circuit of backup power source
It include: third switch metal-oxide-semiconductor, the 4th switch metal-oxide-semiconductor, the 5th switch metal-oxide-semiconductor；Wherein,
Source electrode, the described 4th grid for switching metal-oxide-semiconductor of the third switch metal-oxide-semiconductor are all connected with the main power voltage；It is described
Grid, the described 4th source electrode for switching metal-oxide-semiconductor of third switch metal-oxide-semiconductor are all connected with the backup power source cell voltage；Described
Three switch metal-oxide-semiconductors are connected after being connected with the drain electrode of the 4th switch metal-oxide-semiconductor, substrate with the substrate of the 5th switch metal-oxide-semiconductor；
The drain electrode of the 5th switch metal-oxide-semiconductor is connected with the output end of Width funtion domain linear voltage-stabilizing circuit；The 5th switch MOS
The grid of pipe is used to receive the switching signal of the CPU control switch unit；Using the source electrode of the 5th switch metal-oxide-semiconductor as institute
The output end of the anti-reverse current circuit of backup power source is stated for connecting load.
9. standby usage power supply switch circuit according to claim 2, which is characterized in that the anti-reverse current circuit of backup power source
Voltage quasi position afterwards is higher than voltage quasi position of the main power source access voltage-stablizer after main power source puts adverse current circuit, comprising:
Higher than the 10%-15% of the main power source access stabilizer output voltage；
Voltage quasi position after the anti-reverse current circuit of backup power source is put lower than the main power source access voltage-stablizer by main power source inverse
Voltage quasi position after current circuit, comprising:
Lower than the 10%-15% of the main power source access stabilizer output voltage.
10. a kind of standby usage power-supply switching method, which is characterized in that the method is based on described in any one of claim 1-9
Standby usage power supply switch circuit realize, execute following operation inside CPU control switch unit:
It receives and parses through control instruction, detect current power supply state；Wherein, the control instruction be using main power source power supply or
It is powered using backup power source；
When the control instruction be using main power source power supply and current time backup power source do not power when, control pass through the master
Power supply power supply；
When the control instruction be using backup power source power supply and current time main power source powering when, open it is described spare
Power path adjustable up-down presses voltage-stablizer, adjusts the voltage quasi position of the backup power source access adjustable up-down pressure voltage-stablizer,
Until voltage quasi position after the anti-reverse current circuit of backup power source be higher than the main power source access voltage-stablizer put by main power source it is inverse
Voltage quasi position after current circuit, and start the anti-reverse current circuit of the backup power source, switching is powered by the backup power source；To described
Backup power source supply voltage is stablized, and the main power source access voltage-stablizer is closed, and adjusts the adjustable liter of the backup power source access
The voltage quasi position of voltage-releasing voltage stabilizer, until the voltage quasi position after the anti-reverse current circuit of backup power source is lower than the main power source access
Voltage quasi position of the voltage-stablizer after main power source puts adverse current circuit；
When the control instruction is to open the main electricity using main power source power supply and when current time backup power source is being powered
Source access voltage-stablizer, is powered by the main power source, is stablized to the main power source supply voltage, is closed the backup power source access
Adjustable up-down presses voltage-stablizer, and closes backup power source and put adverse current circuit.
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