CN105245214A - Battery switching circuit - Google Patents
Battery switching circuit Download PDFInfo
- Publication number
- CN105245214A CN105245214A CN201510770250.8A CN201510770250A CN105245214A CN 105245214 A CN105245214 A CN 105245214A CN 201510770250 A CN201510770250 A CN 201510770250A CN 105245214 A CN105245214 A CN 105245214A
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- China
- Prior art keywords
- load
- pmos
- battery
- diode
- switching circuit
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- Direct Current Feeding And Distribution (AREA)
- Dc-Dc Converters (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention discloses a switching circuit for a low power consumption load. The switching circuit comprises an adapter, a diode D1, a battery and a load R1, wherein the adapter is serially connected with an anode of the diode D1, a cathode of the diode D1 is connected with the load R1, the battery is serially connected to both ends of the load R1, PMOS is serially connected between the battery and the load, a drain electrode of the PMOS is connected with the anode of the battery, a source electrode of the PMOS is connected with the load R1, and a grid source electrode of the PMOS is connected with one pin of an MOS control circuit; and other pins of the MOS control circuit are respectively connected between the PMOS and the load R1 and the ground. According to the switching circuit disclosed by the invention, since the MOS control circuit and the PMOS element are adopted, the voltage drop problem caused by the diode in the battery switching circuit is avoided, so that the lower consumption is reduced, and the switching circuit is suitable for portable low power consumption products.
Description
Technical field
The invention belongs to electricity field, be specifically related to a kind of battery switching circuit.
Background technology
Because portable product requires that power consumption is lower, the utilance of power supply is higher, and this series products is generally with inner lithium battery, charges by external adapter, and can use on charging limit, limit.Existing lithium battery commutation circuit is the switching utilizing the reverse characteristic of diode to carry out between battery and adapter, and concrete structure is series diode between battery and load, series diode between adapter and load.But because diode power consumption is too large, be therefore not suitable for being used in low-power consumption load.
Summary of the invention
The object of the invention is to improve the problems referred to above, providing a kind of commutation circuit in low-power consumption load, improve conversion efficiency.
The technical solution used in the present invention is: a kind of battery switching circuit, comprise adapter, diode D1, battery and load R1, adapter is connected on the positive pole of diode D1, the negative pole of diode D1 connects load R1, serial battery, at the two ends of load R1, is in series with PMOS between battery and load, and the drain electrode of PMOS is connected with anode, the source electrode of PMOS connects load R1, and the grid of PMOS connects one of them pin of MOS control circuit; Other pins of described MOS control circuit are also connected between PMOS and load R1 and ground.
Further, the model of described MOS controller is LTC4412.
The beneficial effect that the present invention produces is: by adopting MOS control circuit and PMOS element, makes to reduce in battery switching circuit the problem of pressure drop that diode causes, thus reduces power consumption, be applicable to portable low power-consumption product.
Accompanying drawing explanation
Fig. 1 is universal battery commutation circuit of the prior art;
Fig. 2 is the battery switching circuit after the present invention improves;
Fig. 3 is the circuit diagram of embodiment.
Embodiment
Below in conjunction with accompanying drawing to be originally invention be further described.
As shown in Figure 1, existing lithium battery commutation circuit is the switching utilizing the reverse characteristic of diode to carry out between battery and adapter.
When adapter 1 does not insert, battery bat1 is powered to load R1 by diode D2, and now the voltage of load end is V
bat1-V
d2.Suppose that the electric current of load R1 is I, then the total power consumption of whole circuit is P=I*V
d2+ I
2r
1.When adapter 1 inserts, the cathode voltage held due to diode D2 is larger than anode voltage, and diode D2 oppositely ends, thus cuts off the electric current that battery bat1 flows to load R1.Because diode drop problem (diode drop is generally 0.5V ~ 0.7V), when big current is applied, diode power consumption is too large, is not suitable for low-power consumption application.
As the battery switching circuit figure that Fig. 2 is in the present invention.On the basis of existing technology diode D2 is changed to an a PMOSQ1 and MOS control circuit, wherein MOS control circuit connects the grid of PMOS, source electrode and ground respectively.This control circuit can by detecting MOS source voltage thus the break-make of control PMOS.
When adapter 1 does not insert, battery current outputs to load R1 by the body diode of PMOSQ1, and Q1 source voltage is V
s=V
bat1-V
body, wherein V
bodyfor the step-down size of body diode; MOS control circuit can by detecting the source voltage of PMOS thus this PMOS, MOS conducting voltage V of conducting
dsbe generally tens millivolts, now load place voltage is V
sR1=V
bat1-V
ds.
When adapter inserts, the source voltage of Q1 raises, and when MOS control circuit detects this voltage, can automatically shut down Q1, thus cut-out battery current flows to load.
When the unexpected power-off of adapter or when pulling out, battery bat1 is first by the body diode afterflow of PMOS, and proof load supply power voltage is stablized, and then MOS control circuit is by this PMOS of control PMOS gate-source voltage conducting, thus reduce the power consumption of PMOS, improve battery utilization ratio.
Be below a kind of embodiment of the present invention:
As shown in Figure 3, the model of MOS control circuit U1 is LTC4412, Q2 be PMOS, D3 is Schottky diode, and R2 is load.The adapter of 5V connects Schottky diode D3, and Schottky diode connects load R2, the other end ground connection of load R2; Power supply bat2 connects the drain electrode of PMOSQ2 and 1 pin of MOS control circuit U1 respectively, 2 pin of MOS control circuit U1 and 3 pin ground connection, 4 pin not connection circuit, and 5 pin connect the grid of PMOSQ2, and the source electrode of PMOSQ2 connects 6 pin and the load R2 of MOS control circuit U1 respectively.
When not inserting adaptor power supplies, when namely not having USB power source, PMOSQ2 source voltage is V
s=V
bat2-V
body(V
bodyfor the pressure drop of PMOS body diode), LTC4412 passes through the grid voltage of control PMOSQ2 thus makes PMOS conducting, and LTC4412 passes through the grid voltage of control PMOS thus makes the conducting voltage of MOS reduce to 20mv, that is, from battery to load, the pressure drop of middle loss is 20mv.When after insertion adapter, when 6 pin of LTC4412 have detected external power source, automatically shut down PMOS.And Q2 is due to reverse differential pressure, be also in cut-off state, thus blocking-up battery current flows to load.
The efficiency comparative of two kinds of circuit:
Suppose that electric current needed for load circuit is 1A, then the power consumption of traditional circuit diode is:
P
d=UI=0.7V*1A=0.7W。
In new-type circuit, LTC4412 in normal working conditions required electric current is uA rank, and power consumption is negligible.PMOS power consumption is:
P
mos=UI=0.02V*1A=0.02W。
New-type circuit will decrease 35 times than the power consumption of traditional circuit.
Both can find out in contrast, and novel battery switching circuit application prospect in portable low power-consumption product is very large.
Claims (2)
1. a battery switching circuit, comprise adapter, diode D1, battery and load R1, adapter is connected on the positive pole of diode D1, the negative pole of diode D1 connects load R1, serial battery, at the two ends of load R1, is characterized in that: between battery and load, be in series with PMOS, and the drain electrode of PMOS is connected with anode, the source electrode of PMOS connects load R1, and the grid of PMOS connects one of them pin of MOS control circuit; Other pins of described MOS control circuit are also connected between PMOS and load R1 and ground.
2. a kind of battery switching circuit according to claim 1, is characterized in that: the model of described MOS control circuit is LTC4412.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510770250.8A CN105245214A (en) | 2015-11-12 | 2015-11-12 | Battery switching circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510770250.8A CN105245214A (en) | 2015-11-12 | 2015-11-12 | Battery switching circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105245214A true CN105245214A (en) | 2016-01-13 |
Family
ID=55042739
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510770250.8A Pending CN105245214A (en) | 2015-11-12 | 2015-11-12 | Battery switching circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105245214A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108092395A (en) * | 2017-11-22 | 2018-05-29 | 深圳市科卫泰实业发展有限公司 | A kind of backup battery incision and floating charge control device |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7030591B2 (en) * | 2003-07-16 | 2006-04-18 | Dialog Semiconductor Gmbh | Integrated circuit implementing protection switch for battery charging and discharging with enhanced reverse voltage protection |
| CN101958576A (en) * | 2010-05-20 | 2011-01-26 | 福建星网锐捷网络有限公司 | Power supply redundancy parallel circuit and working method thereof |
| CN102130345A (en) * | 2010-01-15 | 2011-07-20 | 扬光绿能股份有限公司 | Fuel cell system and power supply management method thereof |
| CN202094845U (en) * | 2011-03-24 | 2011-12-28 | 北京爱德发科技有限公司 | Device for managing power supply |
| CN202121344U (en) * | 2011-06-13 | 2012-01-18 | 北京万集科技股份有限公司 | Chargeable battery device and charging switching circuit |
| CN205142168U (en) * | 2015-11-12 | 2016-04-06 | 郑州雅晨生物科技有限公司 | Battery switching circuit |
-
2015
- 2015-11-12 CN CN201510770250.8A patent/CN105245214A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7030591B2 (en) * | 2003-07-16 | 2006-04-18 | Dialog Semiconductor Gmbh | Integrated circuit implementing protection switch for battery charging and discharging with enhanced reverse voltage protection |
| CN102130345A (en) * | 2010-01-15 | 2011-07-20 | 扬光绿能股份有限公司 | Fuel cell system and power supply management method thereof |
| CN101958576A (en) * | 2010-05-20 | 2011-01-26 | 福建星网锐捷网络有限公司 | Power supply redundancy parallel circuit and working method thereof |
| CN202094845U (en) * | 2011-03-24 | 2011-12-28 | 北京爱德发科技有限公司 | Device for managing power supply |
| CN202121344U (en) * | 2011-06-13 | 2012-01-18 | 北京万集科技股份有限公司 | Chargeable battery device and charging switching circuit |
| CN205142168U (en) * | 2015-11-12 | 2016-04-06 | 郑州雅晨生物科技有限公司 | Battery switching circuit |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108092395A (en) * | 2017-11-22 | 2018-05-29 | 深圳市科卫泰实业发展有限公司 | A kind of backup battery incision and floating charge control device |
| CN108092395B (en) * | 2017-11-22 | 2023-12-29 | 深圳市科卫泰实业发展有限公司 | Back-up battery cut-in and float charging control device |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WD01 | Invention patent application deemed withdrawn after publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20160113 |