CN202363960U

CN202363960U - Double-battery power supply device

Info

Publication number: CN202363960U
Application number: CN2011203019459U
Authority: CN
Inventors: 蒋海林
Original assignee: Will Semiconductor Ltd
Current assignee: Will Semiconductor Ltd
Priority date: 2011-08-18
Filing date: 2011-08-18
Publication date: 2012-08-01
Anticipated expiration: 2021-08-18

Abstract

The utility model discloses a double-battery power supply device. The double-battery power supply device comprises a first battery and a second battery; a load switch unit which is electrically connected with the first battery and the second battery, and is used for turning on or turning off electric connection between the first battery or the second battery and an external load; and a battery state detection control unit which is electrically connected with the first battery, the second battery and the load switch unit, and is used for detecting the connecting state or the voltage state of the first battery or the second battery, and for controlling the turning-on or shut-down of the load switch unit. According to the double-battery power supply device, the adoption of the two rechargeable batteries and the load switch unit allows the two batteries to be switched in an intelligent manner, and enables a user to switch the batteries manually, thereby increasing the standby time and enhancing the control for switching the two batteries. Moreover, a power supply protection unit is arranged so that the two batteries and an external power supply are prevented from mutual conduction.

Description

The double cell electric supply installation

Technical field

The utility model relates to a kind of double cell electric supply installation, particularly relates to a kind of double cell electric supply installation that can charge.

Background technology

The calculation process ability of hand-hold electronic equipments (smart mobile phone, GPS tracker, panel computer) is advanced by leaps and bounds at present, has satisfied the basic demand of user to the communication amusement greatly.Constantly the hand-hold electronic equipments of development needs battery that the purpose that communication service can both be provided to reach in any place to the user is provided as power supply; Yet the raising of CPU processing speed and the raising of other hardware performances all are accompanied by the increase of energy consumption, have brought challenge with regard to the supplying cell of giving hand-hold electronic equipments like this.

And the present finite capacity of battery in the mobile electronic product, and it is bigger to enlarge the technical difficulty of capacity of battery self, and cost also is huge, so the short problem of battery stand-by time often takes place existing mobile electronic product.

The utility model content

The technical problem that the utility model will solve is in order to overcome in the prior art because battery capacity is limited; And the short defective of the battery stand-by time that causes of the increase of equipment power dissipation; A kind of double cell power supply dress is provided, improves stand-by time through controlling two batteries intelligently.

The utility model solves above-mentioned technical problem through following technical proposals:

The utility model provides a kind of double cell electric supply installation, comprises one first battery and one second battery, is characterized in that said double cell electric supply installation also comprises:

One load switch unit is electrically connected with said first battery and second battery and is used to open or turn-offs being electrically connected of said first battery or second battery and external loading;

One battery status detects control unit, is electrically connected and is used to detect the connection status and the voltage status of said first battery or second battery with said first battery, second battery and load switch unit, and controls the unlatching of said load switch unit or close.

Preferably, said battery status detects control unit also to have a battery and selects circuit, is electrically connected with said load switch unit and is used for the battery selection signal according to the outside that receives, and controls the unlatching of said load switch unit or closes.

Preferably, said battery status detection control unit comprises: one first test circuit for cell status is electrically connected with said first battery, and is used to detect the connection status of said first battery; One second test circuit for cell status is electrically connected with said second battery, and is used to detect the connection status of said second battery and the voltage of said second battery.

Preferably; Said first test circuit for cell status comprises one the one NMOS pipe, and said NMOS pipe comprises a grid, a drain electrode and an one source pole, wherein said source electrode be electrically connected; Said grid is electrically connected with said first battery, and said drain electrode is electrically connected with said load switch unit.

Preferably; Said second test circuit for cell status comprises one the 2nd NMOS pipe, one the 3rd NMOS pipe, one the 4th NMOS pipe and a voltage detector; Said the 2nd NMOS pipe, the 3rd NMOS pipe and the 4th NMOS pipe include a grid, a drain electrode and an one source pole, and said voltage detector has an input and an output;

The source electrode of wherein said the 2nd NMOS pipe, the 3rd NMOS pipe and the 4th NMOS pipe all be electrically connected; The drain electrode of said the 2nd NMOS pipe and the 3rd NMOS pipe all is electrically connected with said load switch unit; The grid of said the 2nd NMOS pipe is electrically connected with the output of said voltage detector; The input of said voltage detector is electrically connected with said second battery; The drain electrode of said the 4th NMOS pipe is electrically connected with the grid of said the 3rd NMOS pipe, and the grid of said the 4th NMOS pipe is electrically connected with said second battery.

Preferably, said battery selects circuit to comprise one first receiving terminal, one second receiving terminal, one the 5th NMOS pipe, one first resistance and one second resistance, and wherein said the 5th NMOS pipe has a grid, a drain electrode and an one source pole;

Wherein said second receiving terminal is electrically connected with said the 5th NMOS pipe; The source electrode of said the 5th NMOS pipe be electrically connected; The source electrode of said the 5th NMOS pipe is electrically connected with the output of said voltage detector; Said first receiving terminal is electrically connected through the grid of said first resistance with said the 3rd NMOS pipe, said first resistance also pass through said second resistance be electrically connected.

Preferably, said first battery and second battery are rechargeable battery.Thereby can improve the reduction use cost, improve rate of energy.

Preferably; Said double cell electric supply installation also comprises: one first battery charging unit and one second battery charging unit are electrically connected with said first battery and second battery respectively and are used to detect the voltage of said first battery and second battery and to said first battery and second battery charge; One charging control unit; Be electrically connected with said first battery charging unit and second battery charging unit; And, control said first battery charging unit and second battery charging unit to said first battery and second battery charge according to said first battery charging unit and said first battery of second battery charging unit detection and the voltage of second battery.

Preferably, said first battery charging unit and second battery charging unit include: a battery voltage detection circuit is used to detect the voltage of said first battery or said second battery; One charging circuit is used for through external power source said first battery or said second battery charge.

Preferably, said battery voltage detection circuit comprises a voltage output end, one the 3rd resistance, one the 4th resistance and an electric capacity;

Wherein said first battery or said second battery are electrically connected with said the 3rd resistance and the 4th resistance successively; Said the 4th resistance also is connected in parallel with said electric capacity; Said voltage output end through said electric capacity be electrically connected, and also be electrically connected with said charging control unit.

Preferably, said load switch unit comprises one first inverter, one second inverter, one first switch and a second switch, and said first inverter and second inverter all have an input and an output;

The output of wherein said first inverter is electrically connected with second switch; The input of said first inverter is electrically connected with the output of said second inverter; The output of said second inverter also is electrically connected with said first switch; The input of said second inverter detects control unit with said battery status and is electrically connected, and said first switch also is connected between external loading and said first battery, and said second switch also is connected between said external loading and said second battery.

Preferably, said first switch has one the one PMOS pipe and one the 2nd PMOS pipe, and said PMOS pipe and the 2nd PMOS pipe all have a grid, a drain electrode and an one source pole;

The drain electrode of wherein said PMOS pipe and the 2nd PMOS pipe interconnects; The grid of said PMOS pipe and the 2nd PMOS pipe all is electrically connected with the output of said second inverter; The source electrode of said PMOS pipe is electrically connected with said external loading, and the source electrode of said the 2nd PMOS pipe is electrically connected with said first battery.

Preferably, said second switch has one the 3rd PMOS pipe and one the 4th PMOS pipe, and said the 3rd PMOS pipe and the 4th PMOS pipe all have a grid, a drain electrode and an one source pole;

The drain electrode of wherein said the 3rd PMOS pipe and the 4th PMOS pipe interconnects; The grid of said the 3rd PMOS pipe and the 4th PMOS pipe all is electrically connected with the output of said first inverter; The source electrode of said the 3rd PMOS pipe is electrically connected with said external loading, and the source electrode of said the 4th PMOS pipe is electrically connected with said second battery.

Preferably, said double cell electric supply installation also comprises a power protection unit, is electrically connected with said first battery, second battery and external power source respectively, and is used to prevent the mutual interference mutually of voltage between said first battery and second battery and the external power source.

Preferably; Said power protection unit comprises one first diode, one second diode and one the 3rd diode; Said first diode, second diode and said the 3rd diode all have an anodal and negative pole; Wherein said first battery, second battery and external power source are connected with said first diode, second diode and the positive electrical of said the 3rd diode respectively, and the negative pole of said first diode, second diode and said the 3rd diode interconnects.

The positive progressive effect of the utility model is:

The double cell electric supply installation of the utility model is through adopting two chargeable batteries, and the load switch unit, between two batteries, the switching each other and can the manual switching to battery of user operate of intelligence; Thereby when having improved stand-by time; Improved control to the switching of two batteries, in addition, also through a power protection unit; Stop the mutual conduction between two batteries and the external power source, thereby protected the safety of mobile electronic product.

Description of drawings

Fig. 1 is the circuit structure block diagram of first embodiment of the double cell electric supply installation of the utility model.

Fig. 2 is the circuit structure block diagram of second embodiment of the double cell electric supply installation of the utility model.

Fig. 3 is the circuit structure block diagram of the 3rd embodiment of the double cell electric supply installation of the utility model.

Fig. 4 is the circuit diagram of the 3rd embodiment of the double cell electric supply installation of the utility model.

Fig. 5 is the circuit diagram of power protection unit of the 4th embodiment of the double cell electric supply installation of the utility model.

Embodiment

Provide the utility model preferred embodiment below in conjunction with accompanying drawing, to specify the technical scheme of the utility model.

First embodiment:

Double cell electric supply installation as shown in Figure 1 comprises that

battery

11 and 12, a load switch unit 2, a battery status detect a control unit 3 and a load 4.

Wherein, said

battery

11 and 12 is used to said load 4 power supply is provided.Said load switch unit be connected in said

battery

11 and 12 and load 4 between, and open or turn-off said

battery

11 or 12 with being electrically connected of load 4.

Said battery status detect control unit 3 respectively with said

battery

11 and 12 and load switch unit 2 be electrically connected; And said battery 11 that detects and 12 voltage status and with the connection status of said double cell electric supply installation; Thereby control the unlatching of said load switch unit 2 or close, thereby control

battery

11 and 12 provides power supply for load.

The operation principle of present embodiment is following:

Said battery status detects connection status and the voltage status that control unit 3 detects battery 11; Said double cell electric supply installation and voltage have been connected to greater than making the threshold voltage of said double cell electric supply installation operate as normal if detect battery 11; Then said battery status detection control unit 3 unlatching batteries 11 are electrically connected with said load 4; And close being electrically connected of said battery 12 and said load 4, thereby use battery 11 power supply to be provided as load 4.

If the voltage that said battery status detection control unit 3 does not detect battery 11 or battery 11 is less than said threshold voltage; Whether the voltage whether then said battery status detection control unit 3 detection batteries 12 insert said double cell electric supply installation and said battery 12 is greater than said threshold voltage; If testing result is for being; Then said battery status detection control unit 3 unlatching batteries 12 are electrically connected with said load 4; And close being electrically connected of said battery 11 and said load 4, thereby use battery 12 power supply to be provided as load 4.

Present embodiment double cell electric supply installation can be supplied power to load through two batteries, thereby has prolonged the running time of load.

Second embodiment:

Double cell electric supply installation shown in Fig. 2 comprises that

battery

11 and 12, a load switch unit 2, a battery status detect control unit 3, a load 4 and a MCU (microcontroller) 5.Wherein said battery status detects control unit 3 and also comprises test circuit for

cell status

31 and 32 and one battery selection circuit 33.

The structure of wherein said

battery

11 and 12, load switch unit 2 and load 4 is identical with effect and first embodiment shown in Figure 1, just repeats no more here.

Wherein said battery status detect control unit 3 respectively with said

battery

11 and 12 and load switch unit 2 be electrically connected; Wherein said test circuit for cell status 31 is used to detect the connection status of battery 11; Promptly be used for detecting said battery 11 and whether insert the double cell electric supply installation; Said in addition test circuit for cell status 32 also is used to detect the connection status and the voltage status of battery 12, only detects the voltage whether said battery 12 inserts double cell electric supply installation and battery 12.

Said in addition battery is selected circuit 33 to be electrically connected with said load switch unit 2 and is used for selecting signal from the battery that MCU5 receives, and selects signal to control the unlatching of said load switch unit 2 through battery status detection control unit 3 or close according to said battery.

And said battery status detects control unit 3 also according to said battery 11 that detects and 12 connection status and voltage status, controls the unlatching of said load switch unit 2 or closes, and power supply is provided thereby control

battery

11 and 12 for load.

The operation principle of present embodiment is following:

If said test circuit for cell status 32 detects battery 12 and whether inserts said double cell electric supply installation if testing result is for being; Then said battery status detection control unit 3 unlatching batteries 12 are electrically connected with said load 4; And close being electrically connected of said battery 11 and said load 4, thereby use battery 12 power supply to be provided as load 4.

Otherwise said test circuit for cell status 31 detects the connection status of battery 11; Be connected to said double cell electric supply installation if detect battery 11; Then said battery status detection control unit 3 unlatching batteries 11 are electrically connected with said load 4; And close being electrically connected of said battery 12 and said load 4, thereby use battery 11 power supply to be provided as load 4.

When if said test circuit for cell status 31 detects battery 11 access double cell electric supply installations; Said test circuit for cell status 32 detects voltage that battery 12 also inserts double cell electric supply installation and said battery 12 greater than making the threshold voltage of said double cell electric supply installation operate as normal; The battery that then this moment, said battery selected circuit 33 to receive MCU5 is selected signal; And select signal according to the battery of MCU5, that opens selected battery and said load 4 is electrically connected and closes being electrically connected of another battery and said load 4.

Present embodiment selects circuit 33 to make the switching of said

battery

11 and 12 to have more mode through battery, also simultaneously also makes the user can select supplying cell, thereby also provides convenience for user's work such as dismounting battery.

The 3rd embodiment:

As shown in Figure 3, the double cell electric supply installation of present embodiment comprises that rechargeable battery 13 and 14, a load switch unit 2, a battery status detect control unit 3, a load 4, a MCU5 and charhing unit 61 and 62.

Wherein said battery status detects control unit 3 and also comprises test circuit for

cell status

31 and 32 and one battery selection circuit 33.Said charhing unit 61 comprises battery voltage detection circuit 611 and charging circuit 612.Said charhing unit 62 comprises battery voltage detection circuit 621 and charging circuit 622.

Wherein said load switch unit 2, battery status detect control unit 3, load 4, MCU5 and said battery status detect test circuit for cell status 31 that control unit 3 comprises with 32 and battery select the structure of circuit 33 all identical with second embodiment with function, just repeat no more here.

Said in addition rechargeable battery 13 and 14 can also charge except being that load 4 provides power supply, thereby realizes the recycling of battery.

The battery voltage detection circuit 611 of said charhing unit 61 is used to detect the voltage of said rechargeable battery 13.Said charging circuit 612 is used for through the power supply of outside said rechargeable battery 13 being charged.

The battery voltage detection circuit 621 of said charhing unit 62 is used to detect the voltage of said rechargeable battery 14.Said charging circuit 622 is used for through the power supply of outside said rechargeable battery 14 being charged.

Said MCU5 also is used for as charging control unit, and according to said charhing unit 61 and the said rechargeable battery 13 of charhing unit 62 detections and 14 voltage, controls said charhing unit 61 and 62 pairs of said rechargeable batteries 13 of charhing unit and 14 chargings.

Shown in Figure 4 is the double cell electric supply installation circuit diagram shown in Fig. 3.

Wherein said test circuit for cell status 31 comprises NMOS pipe (N type metal-oxide semiconductor transistor) 311; The source electrode of wherein said NMOS pipe 311 be electrically connected; The grid of said NMOS pipe 311 is connected with the cathodic electricity of said rechargeable battery 13 through a resistance (not showing among Fig. 4), and the drain electrode of said NMOS pipe 311 is electrically connected with said load switch unit 2.

The drain and gate of said in addition NMOS pipe 311 also passes through resistance 901 respectively and is electrically connected with a power Vcc with resistance 902, thereby guarantees input and export the stable of signal.Wherein said power Vcc is that said rechargeable battery 13 and 14 provides.

Said test circuit for cell status 32 comprises NMOS pipe 321, one NMOS pipe 322, one NMOS pipe 323 and one voltage detector 324.

The source electrode of wherein said NMOS pipe 321,322 and 323 all be electrically connected; The drain electrode of said

NMOS pipe

321 and 323 is electrically connected with load switch unit 2; The grid of said NMOS pipe 321 is electrically connected with the output of said voltage detector 324; The input of said voltage detector 324 is electrically connected with said rechargeable battery 14, is serially connected with a resistance 903 between the input of said voltage detector 324 and the output, is used to regulate the output voltage of said voltage detector 324; Make that output voltage is not that to be in high level be exactly low level, prevents the uncertain of output voltage state.The grid of said NMOS pipe 321 also selects circuit 33 to be electrically connected with said battery.The drain electrode of said in addition NMOS pipe 322 is electrically connected with the grid of said NMOS pipe 323, and the grid of said NMOS pipe 322 is connected with the cathodic electricity of rechargeable battery 14 through a resistance (not showing among Fig. 4).And the grid of said NMOS pipe 322 also is electrically connected with power Vcc through resistance 904, thereby guarantees that said NMOS manages stablizing of 322 grid.The grid of said NMOS pipe 323 also selects circuit 33 to be electrically connected with said battery.

Said battery selects circuit 33 to comprise NMOS pipe 331,

resistance

332 and 333 and two

ports

334 and 335 of being connected with MCU5.Wherein said port 334 is electrically connected through the grid of a resistance 332 with the NMOS pipe 323 of said test circuit for cell status 32; And said resistance 332 and resistance 333 be electrically connected; Said port 335 is electrically connected with the grid of said NMOS pipe 331; The source electrode of said NMOS pipe 331 be electrically connected, said NMOS manages 331 drain electrode and is electrically connected with the output of the voltage detector 324 of said test circuit for cell status 32.

The battery voltage detection circuit 611 of said charhing unit 61 comprises a voltage output end 6111,

resistance

6112 and 6113 and electric capacity 6114.Wherein said rechargeable battery 13 and resistance 6112 are connected with 6113 successively, and said resistance 6113 is parallelly connected with said electric capacity 6114.Said voltage output end 6111 through said electric capacity 6114 be electrically connected, and also be electrically connected with said MCU5.

The structure of the battery voltage detection circuit 621 of said charhing unit 62 is identical with the structure of battery voltage detection circuit 611, only is with voltage output end 6111,

resistance

6112 and 6113 and electric capacity 6114 replaces with 6211,

resistance

6212 and 6213 and electric capacity 6214.

The user can also adopt the battery voltage detection circuit of other kinds to realize the purpose of identical detection voltage as required in addition.

And the structure of charging circuit 612 shown in Figure 4 and the existing charging circuit of 622 employings, the user can adopt the charging circuit of variety classes or form according to the charging requirement of product, so just set forth the formation of said charging circuit 612 and 622 here no longer in detail.

The unit of load switch described in the present embodiment 2 comprises

inverter

21 and 22 and switch 23 and 24.The output of wherein said inverter 21 is electrically connected with switch 24; The input of said inverter 21 is electrically connected with the output of said inverter 22; The output of said inverter 22 also is electrically connected with said switch 23; The input of said inverter 22 detects control unit 31 with said battery status and is electrically connected, and said switch 23 also is connected between load 4 and the said rechargeable battery 13, and said switch 24 also is connected between said load 4 and the said rechargeable battery 14.

Wherein said switch 23 comprises PMOS pipe (P type metal-oxide semiconductor transistor) 231 and 232; The drain electrode of said PMOS pipe 231 and PMOS pipe 232 interconnects; The grid of said PMOS pipe 231 and PMOS pipe 232 all is electrically connected with the output of said inverter 22; The source electrode of said PMOS pipe 231 is electrically connected with said load 4, and the source electrode of said PMOS pipe 232 is electrically connected with said rechargeable battery 13.The structure of said switch 24 is identical with the structure of said switch; Only replaced

PMOS pipe

231 and 232 with PMOS pipe 241 and 242; And the source electrode of said PMOS pipe 241 is electrically connected with said rechargeable battery 14, and the grid of said PMOS pipe 241 and PMOS pipe 242 all is electrically connected with the output of said inverter 21.

The structure of switch can prevent to be carried on oppositely ganging up of electric current between the rechargeable battery in the present embodiment, thereby improves the turn-off capacity of switch.The user can also adopt the switch of other kinds according to actual needs in addition.And

inverter

21 and 22 employings existing inverter structure as shown in Figure 4, the user can also adopt the inverter of other kinds to realize identical functions.

The operation principle of present embodiment is following:

If whether said test circuit for cell status 32 detects rechargeable battery 14 and insert in the said double cell electric supply installation, promptly when rechargeable battery 14 inserted, the grid of said NMOS pipe 322 was a low level; So managing, said NMOS is high level on 323 grids, so NMOS manages 323 conductings, so inverter 21 inputs are low level; Output is a high level, and the output of said inverter 22 is a low level, so switch 24 is opened; Switch 23 cuts out, and 14 pairs of loads 4 of said rechargeable battery provide power supply.

If said rechargeable battery 14 does not insert said double cell electric supply installation, then said test circuit for cell status 31 detects rechargeable battery 13 and whether inserts the double cell electric supply installation, promptly when rechargeable battery 13 inserts the double cell electric supply installation; The voltage that NMOS manages on 311 grids is low, and this moment, the level at the input of inverter 21 was high, so the level on the switch 23 is low; Level on the switch 24 is high; So switch 23 is connected, switch 24 breaks off, thereby makes 13 pairs of loads 4 of rechargeable battery that power supply is provided.

When said rechargeable battery 13 and 14 all inserts the double cell electric supply installation; MCU5 opens NMOS pipe 331 through port 335, thereby makes voltage detector 324 work, when the voltage of rechargeable battery 14 greater than making the threshold voltage of said double cell electric supply installation operate as normal; This moment, voltage detector 324 was output as low level; So NMOS manages 321 not conductings, thus the conducting that MCU5 can be through the said NMOS pipe 323 of port 334 control and ending, thus the level of indirect change inverter 21 inputs; Thereby the unlatching of

control switch

23 and 24 and shutoff, thereby MCU5 can realize being chosen as the rechargeable battery that load 4 provides power supply.When the voltage of rechargeable battery 14 during less than said threshold voltage, MCU5 closes voltage detector 324, thereby forbids the control of MCU5 to switch 23 and 24.Prevent that the user from switching on the rechargeable battery 14 of undertension, prevented outage all of a sudden.

Whether the voltage that battery voltage detection circuit 621 described in this external said process and 611 constantly detects rechargeable battery 13 and 14 is sent to MCU5 less than said threshold voltage and with testing result; Be that MCU5 detects the voltage that falls within on resistance 6113 and the resistance 6213, thereby respectively rechargeable battery 13 and 14 charged through charging circuit 612 and 622.

The 4th embodiment:

The difference of present embodiment and the 3rd embodiment is; Double cell electric supply installation in the present embodiment also comprises a power protection unit 8; Said power protection unit 8 is electrically connected with external charger, rechargeable battery 13 and 14, is used to prevent voltage phase mutual interference between said external charger, the rechargeable battery 13 and 14.

Its circuit structure is as shown in Figure 5, and wherein said power protection unit 8 comprises three

diodes

81,82 and 83.Said rechargeable battery 13 is electrically connected with power Vcc through diode 82; Said rechargeable battery 14 is electrically connected with power Vcc through diode 81; Said external charger is electrically connected with power Vcc through diode 83; Thereby when power Vcc being provided, also be beneficial to the unidirectional on state characteristic of

diode

81,82 and 83, prevented voltage phase mutual interference between external charger, the rechargeable battery 13 and 14 for said double cell electric supply installation.

Though more than described the embodiment of the utility model, it will be understood by those of skill in the art that these only illustrate, the protection range of the utility model is limited appended claims.Those skilled in the art can make numerous variations or modification to these execution modes under the prerequisite of principle that does not deviate from the utility model and essence, but these changes and modification all fall into the protection range of the utility model.

Claims

1. a double cell electric supply installation comprises one first battery and one second battery, it is characterized in that said double cell electric supply installation also comprises:

2. double cell electric supply installation as claimed in claim 1; It is characterized in that; Said battery status detects control unit and also has battery selection circuit; Be electrically connected with said load switch unit and be used for selecting signal, control the unlatching of said load switch unit or close according to the battery of the outside that receives.

3. double cell electric supply installation as claimed in claim 2 is characterized in that, said battery status detects control unit and comprises:

One first test circuit for cell status is electrically connected with said first battery, and is used to detect the connection status of said first battery;

One second test circuit for cell status is electrically connected with said second battery, and is used to detect the connection status of said second battery and the voltage of said second battery.

4. double cell electric supply installation as claimed in claim 3; It is characterized in that; Said first test circuit for cell status comprises one the one NMOS pipe, and said NMOS pipe comprises a grid, a drain electrode and an one source pole, wherein said source electrode be electrically connected; Said grid is electrically connected with said first battery, and said drain electrode is electrically connected with said load switch unit.

5. double cell electric supply installation as claimed in claim 3; It is characterized in that; Said second test circuit for cell status comprises one the 2nd NMOS pipe, one the 3rd NMOS pipe, one the 4th NMOS pipe and a voltage detector; Said the 2nd NMOS pipe, the 3rd NMOS pipe and the 4th NMOS pipe include a grid, a drain electrode and an one source pole, and said voltage detector has an input and an output;

6. double cell electric supply installation as claimed in claim 5; It is characterized in that; Said battery selects circuit to comprise one first receiving terminal, one second receiving terminal, one the 5th NMOS pipe, one first resistance and one second resistance, and wherein said the 5th NMOS pipe has a grid, a drain electrode and an one source pole;

7. double cell electric supply installation as claimed in claim 1 is characterized in that, said first battery and second battery are rechargeable battery.

8. double cell electric supply installation as claimed in claim 7 is characterized in that, said double cell electric supply installation also comprises:

One first battery charging unit and one second battery charging unit are electrically connected with said first battery and second battery respectively and are used to detect the voltage of said first battery and second battery and to said first battery and second battery charge;

One charging control unit; Be electrically connected with said first battery charging unit and second battery charging unit; And, control said first battery charging unit and second battery charging unit to said first battery and second battery charge according to said first battery charging unit and said first battery of second battery charging unit detection and the voltage of second battery.

9. double cell electric supply installation as claimed in claim 8 is characterized in that, said first battery charging unit and second battery charging unit include:

One battery voltage detection circuit is used to detect the voltage of said first battery or said second battery;

One charging circuit is used for through external power source said first battery or said second battery charge.

10. double cell electric supply installation as claimed in claim 9 is characterized in that, said battery voltage detection circuit comprises a voltage output end, one the 3rd resistance, one the 4th resistance and an electric capacity;

11. double cell electric supply installation as claimed in claim 1; It is characterized in that; Said load switch unit comprises one first inverter, one second inverter, one first switch and a second switch, and said first inverter and second inverter all have an input and an output;

12. double cell electric supply installation as claimed in claim 11 is characterized in that, said first switch has one the one PMOS pipe and one the 2nd PMOS pipe, and said PMOS pipe and the 2nd PMOS pipe all have a grid, a drain electrode and an one source pole;

13. double cell electric supply installation as claimed in claim 11 is characterized in that, said second switch has one the 3rd PMOS pipe and one the 4th PMOS pipe, and said the 3rd PMOS pipe and the 4th PMOS pipe all have a grid, a drain electrode and an one source pole;

14. like each described double cell electric supply installation of claim 1-13; It is characterized in that; Said double cell electric supply installation also comprises a power protection unit; Be electrically connected with said first battery, second battery and external power source respectively, and be used to prevent the mutual interference mutually of voltage between said first battery and second battery and the external power source.

15. double cell electric supply installation as claimed in claim 14; It is characterized in that; Said power protection unit comprises one first diode, one second diode and one the 3rd diode; Said first diode, second diode and said the 3rd diode all have an anodal and negative pole; Wherein said first battery, second battery and external power source are connected with said first diode, second diode and the positive electrical of said the 3rd diode respectively, and the negative pole of said first diode, second diode and said the 3rd diode interconnects.