CN206640390U - A kind of low voltage difference dc source and battery powered automatic switch-over circuit - Google Patents
A kind of low voltage difference dc source and battery powered automatic switch-over circuit Download PDFInfo
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- CN206640390U CN206640390U CN201720342082.7U CN201720342082U CN206640390U CN 206640390 U CN206640390 U CN 206640390U CN 201720342082 U CN201720342082 U CN 201720342082U CN 206640390 U CN206640390 U CN 206640390U
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Abstract
The utility model discloses a kind of low voltage difference dc source and battery powered automatic switch-over circuit, the circuit includes DC supply input USB1 and is used for grafting USB power source, cell input terminal BAT1, forward conduction diode D1, dc source and battery powered switching metal-oxide-semiconductor Q1, power filtering capacitor EC1 and C1；Described USB1 is that external Micro USB Dc power input ports input 5V/1A, and cell input terminal BAT1 inputs 3 4.5V, including 23 dry cells；When inserting USB power source, USB1 provides electric current by forward conduction diode D1 to circuit system VCC ends, because metal-oxide-semiconductor Q1 is P-channel metal-oxide-semiconductor, when USB power source is inserted, metal-oxide-semiconductor Q1 G pole tensions are the voltage of D poles of the 5V higher than metal-oxide-semiconductor Q1, and metal-oxide-semiconductor Q1 is reverse-biased to be not turned on giving system power supply loop so as to cut off battery；When USB power source is pulled out, metal-oxide-semiconductor Q1 G poles pulled down to 0 current potential by resistance R3 and resistance R1, and metal-oxide-semiconductor Q1 turn-on batteries provide electric current by metal-oxide-semiconductor Q1 to circuit system VCC ends, are powered by metal-oxide-semiconductor to switch battery and outside DC.
Description
Technical field
Electronic circuit technology is the utility model is related to, specifically a kind of circuit common that effectively reduces is cut using diode
The loss for the voltage and current that power supply is brought is changed, and extends battery remaining time and increases one kind of system power supply stability
Circuit.
Background technology
Fig. 1 is circuit used by battery and externally fed switching most of on the market now, and USB1 external dc electricities are defeated
Enter, BAT1 is battery input (it is 3 ~ 4.5V to connect two to three dry cell voltages), and D1, D2 are power switching diode, EC1, C1
For filter capacitor；When inserting USB power source, D1 forward conductions provide electric current to system VCC, because external input voltage is higher than battery
For voltage so now D2 is reverse-biased is not turned on, battery does not give system power supply；When USB power source is pulled out, battery is given through D2 forward conductions
System VCC powers；Because the characteristic of diode determines conduction voltage drop be present during conducting, and this pressure drop is related to load current, general
Logical silicon diode conduction voltage drop be about 0.5 ~ 1.0V (relevant with load current) with three batteries 4.5V computing systems voltages most
It is big be less than cell voltage 22%, the cost height Schottky of any be then 0.3 ~ 0.5V with three batteries 4.5V computing systems voltages most
It is less than cell voltage 11% greatly；So big pressure drop, which is linked into electric power system, causes system voltage to decline, and power supply output impedance increases
Add, the result brought is that insertion loss increase system voltage is unstable；The system of also assuming that has a minimum operating voltage of fixation
Can be because having accessed diode be reacted to that battery terminal voltage is higher than system voltage so that battery operable time shortens.
The content of the invention
In order to overcome the above-mentioned deficiencies of the prior art, the utility model provides a kind of low voltage difference dc source and battery and supplied
Electric automatic switch-over circuit, mainly powered by low-impedance metal-oxide-semiconductor to switch battery and external dc, reduce insertion loss and
Conduction impedance, so as to increase the stability of system voltage and extend the working time of battery.
Technical scheme is used by the utility model：A kind of low voltage difference dc source and battery powered automatically switch electric
Road, the circuit include DC supply input USB1 and are used for grafting USB power source, cell input terminal BAT1, forward conduction diode
D1, dc source and battery powered switching metal-oxide-semiconductor Q1, power filtering capacitor EC1 and C1；Described USB1 is external Micro
USB Dc power input ports input 5V/1A, cell input terminal BAT1 input 3-4.5V, including 2-3 dry cell；As insertion USB
USB1 provides electric current by forward conduction diode D1 to circuit system VCC ends during power supply, because metal-oxide-semiconductor Q1 is P-channel metal-oxide-semiconductor,
When USB power source is inserted, metal-oxide-semiconductor Q1 G pole tensions are the voltage of D poles of the 5V higher than metal-oxide-semiconductor Q1, metal-oxide-semiconductor Q1 is reverse-biased be not turned on from
And cut off battery and give system power supply loop；When USB power source is pulled out metal-oxide-semiconductor Q1 G poles by resistance R3 and resistance R1 by under
Move 0 current potential to, metal-oxide-semiconductor Q1 turn-on batteries provide electric current to circuit system VCC ends by metal-oxide-semiconductor Q1, switch electricity by metal-oxide-semiconductor
Pond and outside DC power supplies.
Because metal-oxide-semiconductor Q1 conducting impedance extremely low (conduction impedance is less than 0.1ohm by taking SI2301 as an example) and simultaneously as
G poles need not consume electric current when metal-oxide-semiconductor Q1 is voltage control device conducting, so the electric current and voltage of battery all pass to
Load, so as to reduce the loss for the voltage and current that circuit common is brought using diode, when can be used so as to extend battery
Between.
Using low voltage difference dc source of the present utility model and battery powered automatic switch-over circuit, effectively reduce insertion damage
Consumption and conduction impedance, so as to increase the stability of system voltage and extend the working time of battery.
Brief description of the drawings
Fig. 1 is existing conventional power source and battery powered switching circuit figure.
Fig. 2 is the utility model low voltage difference dc source and battery powered automatic switch-over circuit.
Embodiment
The utility model is further described with specific embodiment below in conjunction with the accompanying drawings.
Accompanying drawing 2, a low voltage difference dc source and battery powered automatic switch-over circuit are refer to, the circuit includes dc source
Input USB1 is used for grafting USB power source, cell input terminal BAT1, forward conduction diode D1, dc source and battery powered
Switch metal-oxide-semiconductor Q1, power filtering capacitor EC1 and C1；Described USB1 inputs for external Micro USB Dc power input ports
5V/1A, cell input terminal BAT1 input 3-4.5V, including 2-3 dry cell；When inserting USB power source, USB1 passes through positive guide
Logical diode D1 gives circuit system VCC ends to provide electric current, because metal-oxide-semiconductor Q1 is P-channel metal-oxide-semiconductor, the metal-oxide-semiconductor when USB power source is inserted
Q1 G pole tensions are the voltage of D poles of the 5V higher than metal-oxide-semiconductor Q1, and metal-oxide-semiconductor Q1 is reverse-biased to be not turned on so as to cut off battery to system power supply
Loop；When USB power source is pulled out, metal-oxide-semiconductor Q1 G poles pulled down to 0 current potential, metal-oxide-semiconductor Q1 conductings by resistance R3 and resistance R1
Battery provides electric current by metal-oxide-semiconductor Q1 to circuit system VCC ends, is powered by metal-oxide-semiconductor to switch battery and outside DC.Because
Metal-oxide-semiconductor Q1 conducting impedance extremely low (conduction impedance is less than 0.1ohm by taking SI2301 as an example) and simultaneously as metal-oxide-semiconductor Q1 is voltage
G poles need not consume electric current when control device turns on, so the electric current and voltage of battery have all passed to load, so as to reduce
The loss for the voltage and current that circuit common is brought using diode, and extend battery remaining time.
Above-described embodiment of the present utility model is only intended to clearly illustrate the utility model example, and is not
Restriction to embodiment of the present utility model.And for belong to connotation of the present utility model extend out it is apparent
Change or variation still fall within the scope of protection of the utility model.
Claims (1)
1. a kind of low voltage difference dc source and battery powered automatic switch-over circuit, the circuit is used including DC supply input USB1
In grafting USB power source, cell input terminal BAT1, forward conduction diode D1, dc source and battery powered switching metal-oxide-semiconductor Q1,
Power filtering capacitor EC1 and C1；Described USB1 is that external Micro USB Dc power input ports input 5V/1A, battery input
Hold BAT1 input 3-4.5V, including 2-3 dry cell；When inserting USB power source, USB1 gives electricity by forward conduction diode D1
Road system VCC ends provide electric current, and because metal-oxide-semiconductor Q1 is P-channel metal-oxide-semiconductor, when USB power source is inserted, metal-oxide-semiconductor Q1 G pole tensions are 5V
The voltage of D poles higher than metal-oxide-semiconductor Q1, metal-oxide-semiconductor Q1 is reverse-biased to be not turned on giving system power supply loop so as to cut off battery；Work as USB power source
Metal-oxide-semiconductor Q1 G poles pulled down to 0 current potential by resistance R3 and resistance R1 when being pulled out, and metal-oxide-semiconductor Q1 turn-on batteries pass through metal-oxide-semiconductor
Q1 provides electric current to circuit system VCC ends, is powered by metal-oxide-semiconductor to switch battery and outside DC.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720342082.7U CN206640390U (en) | 2017-04-01 | 2017-04-01 | A kind of low voltage difference dc source and battery powered automatic switch-over circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720342082.7U CN206640390U (en) | 2017-04-01 | 2017-04-01 | A kind of low voltage difference dc source and battery powered automatic switch-over circuit |
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| Publication Number | Publication Date |
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| CN206640390U true CN206640390U (en) | 2017-11-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720342082.7U Active CN206640390U (en) | 2017-04-01 | 2017-04-01 | A kind of low voltage difference dc source and battery powered automatic switch-over circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112467863A (en) * | 2020-11-18 | 2021-03-09 | 北京华益精点生物技术有限公司 | Dual-power switching communication device and method for glucometer |
-
2017
- 2017-04-01 CN CN201720342082.7U patent/CN206640390U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112467863A (en) * | 2020-11-18 | 2021-03-09 | 北京华益精点生物技术有限公司 | Dual-power switching communication device and method for glucometer |
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