CN103326458A - Power supply switching circuit of external power supply and power supply by battery and switching method - Google Patents
Power supply switching circuit of external power supply and power supply by battery and switching method Download PDFInfo
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- CN103326458A CN103326458A CN2013102867219A CN201310286721A CN103326458A CN 103326458 A CN103326458 A CN 103326458A CN 2013102867219 A CN2013102867219 A CN 2013102867219A CN 201310286721 A CN201310286721 A CN 201310286721A CN 103326458 A CN103326458 A CN 103326458A
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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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Abstract
The invention discloses a power supply switching circuit of an external power supply and a power supply by a battery and a switching method. The power supply switching circuit comprises a switch, a first voltage reducer, a second voltage reducer, a third voltage reducer, a voltage reference module, a voltage divider, a comparator and a level transfer module, wherein when voltage of the external power supply is not lower than a predetermined voltage threshold value, the level transfer module controls the switch to cut off the battery to a loaded access, and when voltage of the external power supply is lower than the predetermined voltage threshold value, the level transfer module controls the switch to communicate the battery to the loaded access. With the adoption of the power supply switching circuit and the switching method disclosed by the invention, a set of switches is just used to select power supplies of the system, so that the structure of the control circuit is simplified and the reliability of the circuit is improved.
Description
Technical field
The present invention relates to the electronic circuit technology field, relate in particular to a kind of external power source and battery powered power supply switch circuit and changing method.
Background technology
Have again in the battery powered electronic system in existing external power source, power supply switch circuit need to be controlled two groups of switches, and the connected sum of controlling respectively external power source disconnects, and the connected sum of battery supply disconnects.And the voltage swing according to external power source and battery supply concerns to control one of them power supply of use to system power supply.The state of two groups of switches needs strict the guarantee, otherwise in case the state that occurs that two power supplys connect into simultaneously or disconnect simultaneously all may cause system to make mistakes.
Summary of the invention
In view of this, the technical problem to be solved in the present invention provides a kind of external power source and battery powered power supply switch circuit and changing method, only to realize selection to the system power supply power supply with one group of switch, reach and simplify circuit structure and improve circuit reliability.
It is as follows that the present invention solves the problems of the technologies described above the technical scheme that adopts:
According to an aspect of the present invention, a kind of external power source and the battery power supply commutation circuit that provide comprise: switch, the first reducing transformer, the second reducing transformer, the 3rd reducing transformer, voltage reference module, voltage divider, comparator and level shift module, wherein:
The input of the first reducing transformer is connected to external power source, and output is connected to voltage reference module and comparator; The input of the second reducing transformer is connected to battery supply, and output is connected to voltage reference module and comparator; The input of the 3rd reducing transformer is connected to external power source, and output connects load; The input of voltage divider connects external power source, and output connects an input of comparator; The input of voltage reference module connects the output of the first reducing transformer and the second reducing transformer, and output connects an input of comparator; Comparator is according to the comparative result output logic signal of voltage reference module and the voltage divider input to the level shift module; Switch, an end connects battery supply, and the other end connects load, and control end connects the level shift module; The control end of the output connecting valve of level shift module is by conducting and the cut-off of logical signal control switch.
Preferably, the first reducing transformer is diode, triode or metal-oxide-semiconductor.
Wherein, when the first reducing transformer is diode, the anodic bonding external power source of diode, negative electrode is connected to voltage reference module and comparator; When the first reducing transformer was the NPN triode, the collector electrode of NPN triode was connected external power source with base stage, and emitter is connected to voltage reference module and comparator; When the first reducing transformer was the PNP triode, the emitter of PNP triode connected external power source, and base stage and collector electrode are connected to voltage reference module and comparator; When the first reducing transformer is NMOS when pipe, the drain terminal of NMOS pipe, grid end are connected with substrate and are connected external power source, and source is connected to voltage reference module and comparator; When the first reducing transformer was the PMOS pipe, the source of PMOS pipe connected external power source, and drain terminal, grid end and substrate all are connected to voltage reference module and comparator.
Preferably, the second reducing transformer is diode, triode or metal-oxide-semiconductor.
Wherein, when the second reducing transformer is diode, the anodic bonding battery supply of diode, negative electrode is connected to voltage reference module and comparator; When the second reducing transformer was the NPN triode, the collector electrode of NPN triode was connected battery supply with base stage, and emitter is connected to voltage reference module and comparator; When the second reducing transformer was the PNP triode, the emitter of PNP triode connected battery supply, and base stage and collector electrode are connected to voltage reference module and comparator; When the second reducing transformer is NMOS when pipe, the drain terminal of NMOS pipe, grid end are connected with substrate and are connected battery supply, and source is connected to voltage reference module and comparator; When the second reducing transformer was the PMOS pipe, the source of PMOS pipe connected external power source, and drain terminal, grid end and substrate all are connected to voltage reference module and comparator.
Preferably, the 3rd reducing transformer is diode, triode or metal-oxide-semiconductor.
Wherein, when the 3rd reducing transformer is diode, the anodic bonding external power source of diode, negative electrode connects load; When the 3rd reducing transformer was the NPN triode, the collector electrode of NPN triode was connected external power source with base stage, and emitter connects load; When the 3rd reducing transformer was the PNP triode, the emitter of PNP triode connected external power source, and base stage and collector electrode are connected to load; When the 3rd reducing transformer is NMOS when pipe, the drain terminal of NMOS pipe, grid end are connected with substrate and are connected external power source, and source is connected to load; When the 3rd reducing transformer was the PMOS pipe, the source of PMOS pipe connected external power source, and drain terminal, grid end and substrate all are connected to load.
Preferably, switch comprises: PMOS pipe MP1 and the MP2 of two series connection, and the source of MP1 is connected battery supply with substrate, and drain terminal connects the drain terminal of MP2, grid end connection control signal; The source of MP2 is connected load with substrate, grid end connection control signal.
According to another aspect of the present invention, a kind of external power source and the battery power supply changing method that provide comprise: when the voltage that detects external power source was not less than default voltage threshold, control switch cut-off battery was to the path of load; When the voltage that detects external power source was lower than default voltage threshold, control switch was communicated with battery to the path of load.
Preferably, default voltage threshold less than the step-down value of battery operated voltage minimum and the 3rd reducing transformer with.
Preferably, the voltage threshold of presetting is realized by the relativeness of the output voltage that output voltage and the voltage divider of voltage reference module are exported.
Power supply switch circuit provided by the invention and changing method, by power supply externally to introducing a reducing transformer between the output voltage, utilize reducing transformer oppositely the characteristic of not conducting disappear except when external power source when not having electricity, therefore battery supply only needs a switch realization to the control of battery supply to the anti-risk of filling with of external power source; At battery supply during to load supplying, avoiding by the threshold voltage that control switch SW1 is set may be to the generation of the charging current of battery supply by external power source.Thereby only use one group of switch can realize selection to the system power supply power supply, simplified the structure of control circuit and improved circuit reliability.
Description of drawings
Fig. 1 is the structural representation of a kind of power supply switch circuit of providing of the embodiment of the invention.
Fig. 2 is the structural representation of a kind of power supply switch circuit of providing of the preferred embodiment of the present invention.
Fig. 3 is the structural representation of the another kind of power supply switch circuit that provides of the preferred embodiment of the present invention.
Embodiment
In order to make technical problem to be solved by this invention, technical scheme and beneficial effect clearer, clear, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, is not intended to limit the present invention.
Embodiment one
Be illustrated in figure 1 as a kind of external power source and battery power supply commutation circuit, this power supply switch circuit comprises: switch SW 1, the first reducing transformer 10, the second reducing transformer 20, the 3rd reducing transformer 30, voltage reference module 40, voltage divider 50, comparator 60 and level shift module 70, wherein:
The input of the first reducing transformer 10 is connected to external power source, and output is connected to voltage reference module 40 and comparator 60; The input of the second reducing transformer 20 is connected to battery supply, and output is connected to voltage reference module 40 and comparator 60; The input of the 3rd reducing transformer 30 is connected to external power source, and output connects load; The input of voltage divider 50 connects external power source, and output connects an input of comparator 60; The input of voltage reference module 40 connects the output of the first reducing transformer 10 and the second reducing transformer 20, and output connects an input of comparator 60; Comparator 60 is according to the comparative result output logic signal of voltage reference module 40 and voltage divider 50 input to level shift module 70; Switch SW 1, one end connects battery supply, and the other end connects load, and control end connects level shift module 70; The control end of the output connecting valve SW1 of level shift module 70 is by conducting and the cut-off of logical signal control switch SW1.
Specifically, when the voltage of external power source is not less than the threshold voltage of circuit setting, then comparator 60 produces logical signal net03 and exports to level shift module 70, level shift module 70 carries out level with logical signal net03 and shifts generation logical signal net04 control switch SW1 cut-off, turn-off battery supply to the path between the load, external power source through the 3rd reducing transformer 30 pairs of loads power.When the voltage of external power source is lower than the threshold voltage of circuit setting, then comparator 60 produces logical signal net03 and exports to level shift module 70, level shift module 70 carries out level with logical signal net03 and shifts generation logical signal net04 control switch SW1 conducting, and battery supply is powered by 1 pair of load of switch SW.
In the present embodiment, because being poured in down a chimney to the voltage of external power source by output voltage V DD2 can not appear in the reverse cut-off characteristics of the 3rd reducing transformer.But because the two-phase on state characteristic of switch SW 1, if poor less than the voltage of the voltage of external power source and the 3rd reducing transformer of cell voltage this moment then exists external power source to pass through the risk that the 3rd reducing transformer and switch SW 1 are charged to battery.Therefore, circuit need to be set suitable threshold voltage V according to the operating voltage range of battery
TH, suppose that the operating voltage of battery is minimum and be VBAT
MIN, the step-down value of reducing transformer is V
DownThreshold voltage V then
THCan be by determining with following formula:
V
TH<VBAT
MIN+V
down （1）
In the present embodiment, threshold voltage V
THSetting be that the relativeness of the output branch pressure voltage net02 of output reference voltage net01 by voltage reference module 40 and voltage divider 50 realizes.Reference voltage net01 is a relatively constant voltage; And branch pressure voltage net02 is the linear dividing potential drop of external power source, and the voltage of case of external power supply is V
BUS, the dividing potential drop coefficient is 1/k, i.e. net02=(1/k) * VBUS, then threshold voltage V
THCan calculate by following formula:
V
TH=(net01/net02)*V
BUS=k*net01 （2）
As the preferred version of the present embodiment, the first reducing transformer 10, the second reducing transformer 20, the 3rd reducing transformer 30 include but not limited to adopt diode, triode or metal-oxide-semiconductor to realize.
In sum, no matter how much voltage of battery supply is, as long as the voltage of external power source is not less than the threshold voltage V that circuit is set
THThen logical signal net04 control switch SW1 cut-off, turn-off battery supply to the path between the load, external power source provides output voltage V DD2 to load supplying through the 3rd reducing transformer, because the reverse cut-off characteristics of the 3rd reducing transformer can not occur being poured in down a chimney to the voltage of external power source by output voltage V DD2, simultaneously, as long as default voltage threshold less than the step-down value of battery operated voltage minimum and the 3rd reducing transformer and, can not occur external power source yet and charge by 1 pair of battery of switch SW.
Embodiment two
The structural representation of a kind of power supply switch circuit of providing of the preferred embodiment of the present invention as shown in Figure 2, adopt three diodes to realize the function of reducing transformer in the present embodiment, specifically comprise: switch SW 1,3 diode D1, D2, D3, voltage reference module 40, voltage divider 50, comparator 60 and level shift module 70, wherein:
One end of switch SW 1 connects battery supply, and the other end connects output voltage V DD2, and control signal net04 is from level shift module 70; The anodic bonding external power source of diode D1, negative electrode connect inner step-down voltage VDD1; The anodic bonding battery supply of diode D2, negative electrode connect inner step-down voltage VDD1; The anodic bonding external power source of diode D3, negative electrode connects output voltage V DD2; The input of voltage divider 50 connects external power source, and output branch pressure voltage net02 connects an input of comparator 60; The working power of voltage reference module 40 is inner step-down voltage VDD1, and output reference voltage net01 connects another input of comparator 60; The working power of comparator 60 is inner step-down voltage VDD1, and output logic signal net03 connects the input of level shift module 70; The logical signal net04 of level shift module 70 output logic signal net03 after over level shifts, conducting and the cut-off of logical signal net04 control switch SW1.
In the present embodiment, take lithium battery as example, typical lithium battery operating voltage is about 3V～4.2V, and the step-down value of supposing diode is 0.7V, so by formula V
TH＜VBAT
MIN+ V
DownAs can be known, the threshold voltage settings scope is V
TH＜3.7V.
No matter how much voltage of battery supply is, when as long as the voltage of external power source is not less than the threshold voltage 3.7V of circuit setting, then logical signal net04 control switch SW1 cut-off, turn-off VBAT to the path between the load, external power source is powered to load through diode D3 output voltage V DD2, and the magnitude of voltage of its output voltage V DD2 equals the poor of outer power voltage and diode D3 step-down value, such as, when the voltage of external power source was 3.7V, its output voltage was 3V.
When the voltage of external power source is lower than the threshold voltage of circuit setting, then logical signal net04 control switch SW1 conducting, to load supplying, being poured in down a chimney to the voltage of external power source by VDD2 can not appear battery supply in the reverse cut-off characteristics owing to diode D3 by switch SW 1 output voltage V DD2.But because the two-way admittance characteristic of switch SW 1 requires the threshold voltage of setting to satisfy above-mentioned formula (1) and just can avoid occurring external power source by 1 pair of battery charging of switch SW this moment.
In the present embodiment, the voltage swing of inner step-down voltage VDD1 equals (V
BUS-0.7V) or (V
BAT-0.7V) in larger that of voltage.Therefore any power supply in external power source and the battery supply has electricity, can be to voltage reference module 40 and comparator 60 power supplies.The minimum voltage of the VDD1 when only powered battery being arranged of system is about VBAT
MINTherefore-0.7V guarantees to realize that prerequisite to the control function of mains switch is the minimum voltage that the minimum operating voltage of voltage reference module 40 and comparator 60 must be lower than VDD1.Take lithium battery as example, the minimum voltage of VDD1 is about 2.3V, and the minimum operating voltage of voltage reference module 40 and comparator 60 must be lower than 2.3V so.
Certainly, the step-down value of diode only illustrates in the present embodiment, can select the diode of other types to realize in the reality, can also adopt triode and metal-oxide-semiconductor to substitute.
Specifically, when adopting the NPN triode to substitute diode D1, the collector electrode of NPN triode is connected external power source with base stage, and emitter is connected to voltage reference module 40 and comparator 60; When adopting the PNP triode to substitute diode D1, the emitter of PNP triode connects external power source, and base stage and collector electrode are connected to voltage reference module 40 and comparator 60; When adopting the NMOS pipe to substitute diode D1, the drain terminal of NMOS pipe, grid end are connected with substrate and are connected external power source, and source is connected to voltage reference module 40 and comparator 60; When adopting the PMOS pipe to substitute diode D1, the source of PMOS pipe connects external power source, and drain terminal, grid end and substrate all are connected to voltage reference module 40 and comparator 60.
When adopting the NPN triode to substitute diode D2, the anodic bonding battery supply of diode, negative electrode are connected to voltage reference module 40 and comparator 60; When adopting the NPN triode to substitute diode D2, the collector electrode of NPN triode is connected battery supply with base stage, and emitter is connected to voltage reference module 40 and comparator 60; When adopting the PNP triode to substitute diode D2, the emitter of PNP triode connects battery supply, and base stage and collector electrode are connected to voltage reference module 40 and comparator 60; When adopting the NMOS pipe to substitute diode D2, the drain terminal of NMOS pipe, grid end are connected with substrate and are connected battery supply, and source is connected to voltage reference module 40 and comparator 60; When adopting the PMOS pipe to substitute diode D2, the source of PMOS pipe connects external power source, and drain terminal, grid end and substrate all are connected to voltage reference module 40 and comparator 60.
When adopting the NPN triode to substitute diode D3, the collector electrode of NPN triode is connected external power source with base stage, and emitter connects load; When adopting the PNP triode to substitute diode D3, the emitter of PNP triode connects external power source, and base stage and collector electrode are connected to load; When adopting the NMOS pipe to substitute diode D3, the drain terminal of NMOS pipe, grid end are connected with substrate and are connected external power source, and source is connected to load; When adopting the PMOS pipe to substitute diode D3, the source of PMOS pipe connects external power source, and drain terminal, grid end and substrate all are connected to load.
Embodiment three
Be the structural representation of a kind of power supply switch circuit of providing of the preferred embodiment of the present invention as shown in Figure 3, the present embodiment further illustrates the scheme of switch SW 1 on the basis of embodiment two, no longer repeat here with embodiment two identical parts.Switch SW 1 comprises: PMOS pipe MP1 and the MP2 of two series connection, and the source of MP1 is connected battery supply with substrate, and drain terminal connects the drain terminal of MP2, and the grid end connects the control signal net04a of level shift module 70; The source of MP2 is connected load with substrate, and the grid end connects the control signal net04b of level shift module 70.Control signal net04 among Fig. 2 is split as control signal net04a and the net04b of two homophases in Fig. 3.When the voltage of external power source was lower than threshold voltage, control signal net04a and net04b were the low level of 0V voltage, switch SW 1 conducting, and battery supply is powered by 1 pair of load of switch SW.When the voltage of external power source is not less than threshold voltage, net04a is the high level of VBAT voltage, and net04b is the high level of VDD2 voltage, switch SW 1 cut-off, turn-off battery supply to the path between the load, external power source is powered to load through diode D3.
Need to explanatorily be, consist of switch owing to adopting PMOS to manage in the present embodiment, so be high level cut-off and low level conducting.When adopting the PMOS pipe, because voltage domain is VDD1 under the net03, then the high level of net03 not necessarily can stopcock, so must carry out level by level shift module 70 shifts, the control signal net04a of MP1 is moved to and the same voltage domain of battery supply, and the control signal net04b of MP2 moves to the same voltage domain with load power source VDD2.
Power supply switch circuit provided by the invention and changing method, by power supply externally to introducing a reducing transformer between the output voltage, utilize reducing transformer oppositely the characteristic of not conducting disappear except when external power source when not having electricity, therefore battery supply only needs a switch realization to the control of battery supply to the anti-risk of filling with of external power source; At battery supply during to load supplying, avoiding by the threshold voltage that control switch SW1 is set may be to the generation of the charging current of battery supply by external power source.Thereby only use one group of switch can realize selection to the system power supply power supply, simplified the structure of control circuit and improved circuit reliability.
Above with reference to the accompanying drawings of the preferred embodiments of the present invention, be not so limit to interest field of the present invention.Those skilled in the art do not depart from the scope and spirit of the present invention, and can have multiple flexible program to realize the present invention, obtain another embodiment such as the feature as an embodiment can be used for another embodiment.Allly using any modification of doing within the technical conceive of the present invention, be equal to and replace and improve, all should be within interest field of the present invention.
Claims (11)
1. an external power source and battery power supply commutation circuit is characterized in that, comprising: switch, the first reducing transformer, the second reducing transformer, the 3rd reducing transformer, voltage reference module, voltage divider, comparator and level shift module, wherein:
The input of described the first reducing transformer is connected to external power source, and output is connected to voltage reference module and comparator; The input of described the second reducing transformer is connected to battery supply, and output is connected to voltage reference module and comparator; The input of described the 3rd reducing transformer is connected to external power source, and output connects load; The input of described voltage divider connects external power source, and output connects an input of described comparator; The input of described voltage reference module connects the output of the first reducing transformer and the second reducing transformer, and output connects an input of described comparator; Described comparator arrives the input of described level shift module according to the comparative result output logic signal of voltage reference module and described voltage divider; Described switch, an end connects battery supply, and the other end connects load, and control end connects described level shift module; The output of described level shift module connects the control end of described switch, controls conducting and the cut-off of described switch by logical signal.
2. power supply switch circuit according to claim 1 is characterized in that, described the first reducing transformer is diode, triode or metal-oxide-semiconductor.
3. power supply switch circuit according to claim 2 is characterized in that,
When described the first reducing transformer was diode, the anodic bonding external power source of described diode, negative electrode were connected to described voltage reference module and described comparator;
When described the first reducing transformer was the NPN triode, the collector electrode of described NPN triode was connected external power source with base stage, and emitter is connected to described voltage reference module and described comparator;
When described the first reducing transformer was the PNP triode, the emitter of PNP triode connected external power source, and base stage and collector electrode are connected to described voltage reference module and described comparator;
When described the first reducing transformer is NMOS when pipe, the drain terminal of described NMOS pipe, grid end are connected with substrate and are connected external power source, and source is connected to described voltage reference module and described comparator;
When described the first reducing transformer was the PMOS pipe, the source of described PMOS pipe connected external power source, and drain terminal, grid end and substrate all are connected to described voltage reference module and described comparator.
4. power supply switch circuit according to claim 1 is characterized in that, described the second reducing transformer is diode, triode or metal-oxide-semiconductor.
5. power supply switch circuit according to claim 4 is characterized in that,
When described the second reducing transformer was diode, the anodic bonding battery supply of described diode, negative electrode were connected to described voltage reference module and described comparator;
When described the second reducing transformer was the NPN triode, the collector electrode of described NPN triode was connected battery supply with base stage, and emitter is connected to described voltage reference module and described comparator;
When described the second reducing transformer was the PNP triode, the emitter of PNP triode connected battery supply, and base stage and collector electrode are connected to described voltage reference module and described comparator;
When described the second reducing transformer is NMOS when pipe, the drain terminal of described NMOS pipe, grid end are connected with substrate and are connected battery supply, and source is connected to described voltage reference module and described comparator;
When described the second reducing transformer was the PMOS pipe, the source of described PMOS pipe connected external power source, and drain terminal, grid end and substrate all are connected to described voltage reference module and described comparator.
6. power supply switch circuit according to claim 1 is characterized in that, described the 3rd reducing transformer is diode, triode or metal-oxide-semiconductor.
7. power supply switch circuit according to claim 6 is characterized in that,
When described the 3rd reducing transformer is diode, the anodic bonding external power source of described diode, negative electrode connects load;
When described the 3rd reducing transformer was the NPN triode, the collector electrode of described NPN triode was connected external power source with base stage, and emitter connects load;
When described the 3rd reducing transformer was the PNP triode, the emitter of PNP triode connected external power source, and base stage and collector electrode are connected to load;
When described the 3rd reducing transformer is NMOS when pipe, the drain terminal of described NMOS pipe, grid end are connected with substrate and are connected external power source, and source is connected to load;
When described the 3rd reducing transformer was the PMOS pipe, the source of described PMOS pipe connected external power source, and drain terminal, grid end and substrate all are connected to load.
8. the described power supply switch circuit of any one claim according to claim 1-7, it is characterized in that, described switch comprises: PMOS pipe MP1 and the MP2 of two series connection, and the source of MP1 is connected battery supply with substrate, drain terminal connects the drain terminal of MP2, grid end connection control signal; The source of MP2 is connected load with substrate, grid end connection control signal.
9. an external power source and battery power supply changing method is characterized in that, the method comprises:
When the voltage that detects external power source was not less than default voltage threshold, control switch cut-off battery was to the path of load; When the voltage that detects external power source was lower than default voltage threshold, control switch was communicated with battery to the path of load.
10. power-supply switching method according to claim 9 is characterized in that, described default voltage threshold less than the step-down value of battery operated voltage minimum and the 3rd reducing transformer and.
11. according to claim 9 or 10 described power-supply switching methods, it is characterized in that, described default voltage threshold by voltage reference module output voltage and the relativeness of the output voltage of voltage divider output realize.
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| CN201310286721.9A CN103326458B (en) | 2013-07-09 | 2013-07-09 | A kind of external power source and battery powered power supply switch circuit |
| PCT/CN2014/079775 WO2015003541A1 (en) | 2013-07-09 | 2014-06-12 | Power supply switching circuit and switching method between external power supply and battery power supply |
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| CN201310286721.9A CN103326458B (en) | 2013-07-09 | 2013-07-09 | A kind of external power source and battery powered power supply switch circuit |
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Also Published As
| Publication number | Publication date |
|---|---|
| WO2015003541A1 (en) | 2015-01-15 |
| CN103326458B (en) | 2015-11-25 |
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