CN110535231A - A kind of power supply selecting module - Google Patents
A kind of power supply selecting module Download PDFInfo
- Publication number
- CN110535231A CN110535231A CN201910895811.5A CN201910895811A CN110535231A CN 110535231 A CN110535231 A CN 110535231A CN 201910895811 A CN201910895811 A CN 201910895811A CN 110535231 A CN110535231 A CN 110535231A
- Authority
- CN
- China
- Prior art keywords
- power supply
- pmos tube
- voltage
- tube
- external power
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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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
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0068—Battery or charger load switching, e.g. concurrent charging and load supply
-
- 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
- H02J9/061—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 for DC powered loads
Abstract
The present invention provides a kind of power supply selecting modules, belong to power supply system technical field.The electronic product that it solves existing rechargeable battery power supply does not have the technical issues of power supply selects switching circuit.The drain electrode of P1 is connect with external power supply and voltage-stabiliser tube respectively in this power supply selecting module, the source electrode of P1 and the source electrode of P2 are connect with the anode of load, the source electrode of P1 is connected with R3, R3 is connected with the grid of R2 and P1 respectively, R2 is connected with the drain electrode of N1, voltage-stabiliser tube is connected with the grid of N1 and R1 respectively, the source electrode of R1, N1 and the cathode of load are grounded, the drain electrode of P2 is connected with battery and R9 respectively, the first anode connection of R9 and D1, the second anode of D1 is connect with external power supply, and the total cathode of D1 is connect with the grid of P2 and R8 respectively, the other end ground connection of R8.The present invention arranges in pairs or groups battery and external power supply, at any time Switching power, and work is flexible；Battery can be disconnected automatically when accessing external power supply, prevented to battery sink current, safety is higher.
Description
Technical field
The invention belongs to power supply system technical fields, refer in particular to a kind of power supply selecting module.
Background technique
Currently, the electronic product of existing rechargeable battery power supply, in low-power applications, external power supply and battery connect simultaneously
When entering work, switching circuit is selected without power supply, external power supply is while charging the battery by charging circuit to instrumentation
Power supply, if battery charge power only needs 50 watts, and equipment electricity consumption needs 100 watts or more, and this mode needs to design very big
The charging circuit of power, fever serious service life at high cost are short；Another way be on battery powered high-power electronic product,
One independent charger of configuration charges the battery, and equipment only uses battery-powered operation, and flexibility is not high, charging and work alternating
Time is long.
Summary of the invention
It can automatically select the object of the present invention is to provide one kind and electronic product is supplied using battery or external power supply
The power supply selecting module of electricity.
The object of the present invention is achieved like this:
A kind of power supply selecting module, it is characterised in that: including the first PMOS tube, the second PMOS tube and NMOS tube, described
Equal reverse parallel connection has freewheeling diode, the drain electrode difference of first PMOS tube in one PMOS tube, the second PMOS tube and NMOS tube
Connect with the cathode of external power supply and voltage-stabiliser tube, the source electrode of the source electrode of first PMOS tube and the second PMOS tube with load
Anode electrical connection, the source electrode of first PMOS tube are connected with one end of 3rd resistor, the other end difference of the 3rd resistor
It is connected with the grid of one end of second resistance and the first PMOS tube, the other end and the drain electrode phase of NMOS tube of the second resistance
Even, the voltage-stabiliser tube anode be connected respectively with one end of the grid of NMOS tube and first resistor, the first resistor it is another
End, the source electrode of NMOS tube and load cathode be grounded, the drain electrode of second PMOS tube respectively with battery and the 9th resistance
One end is connected, and the other end of the 9th resistance and the first anode of semiconductor diode connect, the semiconductor diode
Second anode is connect with external power supply, and the total cathode of the semiconductor diode is electric with the grid of the second PMOS tube and the 8th respectively
One end of resistance connects, the other end ground connection of the 8th resistance.The cut-in voltage of the first PMOS tube is higher than battery in the present invention
The voltage of full electricity.The source electrode of the first PMOS tube and the second PMOS tube is oppositely arranged in the present invention, guarantees that electric current is merely able to from external
The load of power supply flow direction flows to load from battery, prevents current flowing backwards, is conducive to improve stability and safety.
In a kind of above-mentioned power supply selecting module, the first resistor, second resistance, 3rd resistor, the 8th resistance and
The resistance value of 9th resistance is 100K Ω.
In a kind of above-mentioned power supply selecting module, the voltage range of the battery is 8V-21V, first PMOS tube
Cut-in voltage be greater than 21V.
In a kind of above-mentioned power supply selecting module, the semiconductor diode is Schottky diode BAT54C.
In a kind of above-mentioned power supply selecting module, first PMOS tube and the second PMOS tube be switch time it is short,
The low semiconductor field effect transistor of conducting resistance.The first PMOS tube and the second PMOS tube will bear tens of amperes in the present invention
Electric current will not generate heat.
In a kind of above-mentioned power supply selecting module, when battery is individually powered, voltage is 0V, NMOS tube at external power supply
Off state is in the first PMOS tube；8th resistance, the 9th resistance and semiconductor diode form opening for cell channel
Circuit is opened, accesses after battery and is charged by the freewheeling diode in the second PMOS tube to source electrode, battery passes through the 8th resistance, the 9th
It is applied to the grid of the second PMOS tube after electric resistance partial pressure, is opened at this point, the voltage between the source gate of the second PMOS tube is much larger than
Voltage is opened, the second PMOS tube is connected, meanwhile, freewheeling diode cut-off.The design of above-mentioned unlatching circuit R8, R9, D1 guarantee external
Power supply can close the second PMOS tube, and for the second PMOS tube from opening, this circuit design ensure that battery power supply is logical when no external power supply
When road is opened, external power supply supply access is closed, and builtin voltage VOU counter will not be poured into the port of external power supply.
In a kind of above-mentioned power supply selecting module, when external power supply is individually powered, voltage-stabiliser tube, first resistor and NMOS
Pipe forms the unlatching circuit of external power supply, and the voltage of external power supply is greater than 22V, is applied to NMOS by voltage-stabiliser tube and first resistor
The grid voltage of pipe is about 2V, and NMOS tube is opened, and then external power supply passes through the freewheeling diode that is connected in parallel in the first PMOS tube
And second resistance, 3rd resistor, NMOS tube current voltage distribution, the source gate voltage of the first PMOS tube are greater than cut-in voltage, the
The conducting of one PMOS tube；At this point, external power supply will be greater than electricity by the grid voltage that semiconductor diode is applied to the second PMOS tube
Cell voltage (is applied to the source voltage of the second PMOS tube), therefore the second PMOS tube is ended.Foregoing circuit design ensure that outer
When setting power supply power supply access opening, battery supply access is closed, and prevents the anti-port for being poured into battery builtin voltage VOU.
In a kind of above-mentioned power supply selecting module, when battery and external power supply access simultaneously, the voltage of external power supply
There is the process of a rising, when external power supply voltage rises towards cell voltage, the second PMOS tube elder generation stopping is born at this time
The work that the freewheeling diode in the first PMOS tube and the second PMOS tube maintains very short time is carried, external power supply voltage rises to
When about 22V, so that NMOS tube is entered open state by voltage-stabiliser tube and first resistor, the first gate pmos pole tension be pulled low and into
Enter open state, external power supply starts to power；Into after external power supply power supply, the first PMOS tube is opened, the cut-off of the second PMOS tube,
The cut-off of the freewheeling diode of first PMOS tube and the second PMOS tube.Foregoing circuit design ensure that battery and external power supply while connect
It is fashionable, the unlatching of external power supply supply access and the closing of battery supply access；Voltage-stabiliser tube in foregoing circuit, first resistor and
NMOS tube forms the control circuit of external power supply, the control electricity of the 8th resistance, the 9th resistance and semiconductor diode composition battery
Road.
The present invention is prominent and beneficial compared with prior art to be had the technical effect that
1, the present invention arranges in pairs or groups battery and external power supply, at any time Switching power, and work is flexible；When only battery powered
It waits, does not have to external cable power, mobility is strong；External power supply is accessed before dead battery capability, loads sustainable work, and
And can automatically be disconnected battery when access external power supply, it prevents to battery sink current, safety is higher.
2, VOU can be used as powerful device power supply in the present invention, while parallel connection fills independent electric circuit and charges the battery, and fills
It is automatically stopped charging after full electricity, the cell voltage of full electricity will not be higher than VOU, so the second PMOS tube is always maintained at closing shape
State.
Detailed description of the invention
Fig. 1 is circuit diagram of the invention.
In figure, VIN, external power supply；VBAT, battery；Output voltage after VOU, power supply selection；P1, the first PMOS tube；
P2, the second PMOS tube；N1, NMOS tube；D1, semiconductor diode；Z1, voltage-stabiliser tube；R1, first resistor；R2, second resistance；R3,
3rd resistor；R8, the 8th resistance；R9, the 9th resistance；S, source electrode；D, it drains；G, grid.
Specific embodiment
With specific embodiment, the invention will be further described with reference to the accompanying drawing, referring to Fig. 1:
This power supply selecting module includes the first PMOS tube (P1), the second PMOS tube (P2) and NMOS tube (N1), the first PMOS
Reverse parallel connection has freewheeling diode, the leakage of the first PMOS tube (P1) in pipe (P1), the second PMOS tube (P2) and NMOS tube (N1)
Pole (D) is connect with the cathode of external power supply (VIN) and voltage-stabiliser tube (Z1) respectively, the source electrode (S) of the first PMOS tube (P1) and second
The source electrode (S) of PMOS tube (P2) is electrically connected with the anode of load, the source electrode (S) and 3rd resistor (R3) of the first PMOS tube (P1)
One end be connected, the other end of 3rd resistor (R3) grid with one end of second resistance (R2) and the first PMOS tube (P1) respectively
(G) be connected, the other end of second resistance (R2) is connected with the drain electrode (D) of NMOS tube (N1), voltage-stabiliser tube (Z1) it is positive respectively with
The grid (G) of NMOS tube (N1) is connected with one end of first resistor (R1), the other end of first resistor (R1), NMOS tube (N1)
Source electrode (S) and load cathode be grounded, the drain electrode (D) of the second PMOS tube (P2) respectively with battery (VBAT) and the 9th resistance
(R9) one end is connected, and the other end of the 9th resistance (R9) is connect with the first anode of semiconductor diode (D1), semiconductor two
Pole pipe (D1) second anode is connect with external power supply (VIN), the total cathode of semiconductor diode (D1) respectively with the 2nd PMOS
The grid (G) of pipe (P2) is connected with one end of the 8th resistance (R8), the other end ground connection of the 8th resistance (R8).First in the present invention
The cut-in voltage of PMOS tube (P1) is higher than the voltage of battery (VBAT) full electricity.First PMOS tube (P1) and second in the present invention
The source electrode (S) of PMOS tube (P2) is oppositely arranged, and guarantees that electric current is merely able to flow to load from external power supply (VIN) or from battery
(VBAT) flow direction load, prevents current flowing backwards, is conducive to improve stability and safety；The present invention is by battery (VBAT) and external
Power supply (VIN) collocation, Switching power, work are flexible at any time；When only battery (VBAT) is powered, external wired electricity is not had to
Source, mobility are strong；Battery (VBAT) electricity accesses external power supply (VIN) before exhausting, and loads sustainable work, and access
Battery (VBAT) can be disconnected automatically when external power supply (VIN), prevented to battery (VBAT) sink current, safety compared with
It is high.
Further, first resistor (R1), second resistance (R2), 3rd resistor (R3), the 8th resistance (R8) and the 9th electricity
The resistance value for hindering (R9) is 100K Ω；The voltage range of battery (VBAT) is 8V-21V, the cut-in voltage of the first PMOS tube (P1)
Greater than 21V；Semiconductor diode (D1) is Schottky diode BAT54C；First PMOS tube (P1) and the second PMOS tube (P2) are equal
For the semiconductor field effect transistor that switch time is short, conducting resistance is low.First PMOS tube (P1) and the 2nd PMOS in the present invention
Pipe (P2) will not generate heat the electric current that bear tens of amperes.
When battery (VBAT) is individually powered, voltage is 0V, NMOS tube (N1) and the first PMOS tube at external power supply (VIN)
(P1) it is in off state；8th resistance (R8), the 9th resistance (R9) and semiconductor diode (D1) composition battery (VBAT) are logical
The unlatching circuit in road, access battery (VBAT) are charged by the freewheeling diode on the second PMOS tube (P2) to source electrode (S) afterwards, electricity
Pond (VBAT) is applied to the grid (G) of the second PMOS tube (P2) after dividing by the 8th resistance (R8), the 9th resistance (R9), this
When, the voltage between source electrode (S) grid (G) of the second PMOS tube (P2) is much larger than cut-in voltage, the second PMOS tube (P2) conducting,
Meanwhile freewheeling diode ends.The design of above-mentioned unlatching circuit R8, R9, D1 guarantee that external power supply (VIN) can close second
PMOS tube (P2), for the second PMOS tube (P2) from opening, this circuit design ensure that battery (VBAT) is supplied when no external power supply (VIN)
When electric pathway is opened, external power supply (VIN) supply access is closed, and builtin voltage VOU counter will not be poured into the end of external power supply (VIN)
Mouthful.
When external power supply (VIN) is individually powered, voltage-stabiliser tube (Z1), first resistor (R1) and NMOS tube (N1) composition are external
The voltage of the unlatching circuit of power supply (VIN), external power supply (VIN) is greater than 22V, is applied by voltage-stabiliser tube (Z1) and first resistor (R1)
Grid (G) voltage for being added to NMOS tube (N1) is about 2V, and NMOS tube (N1) is opened, and then external power supply (VIN) is by being connected in parallel on
Freewheeling diode and second resistance (R2), 3rd resistor (R3), NMOS tube (N1) current voltage distribution in first PMOS tube (P1),
Source electrode (S) grid (G) voltage of first PMOS tube (P1) is greater than cut-in voltage, the first PMOS tube (P1) conducting；At this point, external electricity
Source (VIN) will be greater than battery (VBAT) by grid (G) voltage that semiconductor diode (D1) is applied to the second PMOS tube (P2)
Voltage (is applied to source electrode (S) voltage of the second PMOS tube (P2)), therefore the second PMOS tube (P2) is ended.Foregoing circuit design
When ensure that external power supply (VIN) supply access is opened, battery (VBAT) supply access is closed, and prevents builtin voltage VOU is counter from filling
To the port of battery (VBAT).
When battery (VBAT) and external power supply (VIN) access simultaneously, the voltage of external power supply (VIN) has a rising
Process, when external power supply (VIN) voltage rises towards battery (VBAT) voltage, the second PMOS tube (P2) elder generation stopping, this
When freewheeling diode maintenance very short time of the load on the first PMOS tube (P1) and the second PMOS tube (P2) work, external electricity
When source (VIN) voltage rises to about 22V, NMOS tube (N1) is set to enter opening state by voltage-stabiliser tube (Z1) and first resistor (R1)
State, the first PMOS tube (P1) grid (G) voltage are pulled low and enter open state, and external power supply (VIN) starts to power；Into outer
After setting power supply (VIN) power supply, the first PMOS tube (P1) is opened, the second PMOS tube (P2) cut-off, the first PMOS tube (P1) and second
The freewheeling diode of PMOS tube (P2) ends.Foregoing circuit design ensure that battery (VBAT) and external power supply (VIN) while connect
It is fashionable, the unlatching of external power supply (VIN) supply access and the closing of battery (VBAT) supply access；Voltage-stabiliser tube in foregoing circuit
(Z1), the control circuit of first resistor (R1) and NMOS tube (N1) composition external power supply (VIN), the 8th resistance (R8), the 9th electricity
Hinder the control circuit of (R9) and semiconductor diode (D1) composition battery (VBAT).
VOU in the present invention is the output voltage after power supply selection, can be used as powerful device power supply, while parallel connection is filled solely
Vertical circuit charges to battery (VBAT), and charging is automatically stopped after fully charged, and battery (VBAT) voltage of full electricity will not be high
In VOU, so the second PMOS tube (P2) is always maintained at closed state.
Above-described embodiment is only presently preferred embodiments of the present invention, is not limited the scope of the invention according to this, therefore: it is all according to
The equivalence changes that structure of the invention, shape, principle are done, should all be covered by within protection scope of the present invention.
Claims (8)
1. a kind of power supply selecting module, it is characterised in that: including the first PMOS tube (P1), the second PMOS tube (P2) and NMOS tube
(N1), equal reverse parallel connection has freewheeling diode in first PMOS tube (P1), the second PMOS tube (P2) and NMOS tube (N1), institute
The drain electrode (D) for stating the first PMOS tube (P1) is connect with the cathode of external power supply (VIN) and voltage-stabiliser tube (Z1) respectively, and described first
The source electrode (S) of PMOS tube (P1) and the source electrode (S) of the second PMOS tube (P2) are electrically connected with the anode of load, the first PMOS
The source electrode (S) of pipe (P1) is connected with one end of 3rd resistor (R3), and the other end of the 3rd resistor (R3) is electric with second respectively
One end of resistance (R2) is connected with the grid (G) of the first PMOS tube (P1), the other end and NMOS tube of the second resistance (R2)
(N1) drain electrode (D) is connected, the anode of the voltage-stabiliser tube (Z1) respectively with the grid (G) of NMOS tube (N1) and first resistor (R1)
One end be connected, the other end of the first resistor (R1), the source electrode (S) of NMOS tube (N1) and load cathode be grounded, institute
The drain electrode (D) for stating the second PMOS tube (P2) is connected with one end of battery (VBAT) and the 9th resistance (R9) respectively, the 9th electricity
The other end for hindering (R9) is connect with the first anode of semiconductor diode (D1), the second anode of the semiconductor diode (D1)
Connect with external power supply (VIN), the total cathode of the semiconductor diode (D1) respectively with the grid (G) of the second PMOS tube (P2)
It is connected with one end of the 8th resistance (R8), the other end ground connection of the 8th resistance (R8).
2. a kind of power supply selecting module according to claim 1, it is characterised in that: when battery (VBAT) is individually powered,
Voltage is 0V at external power supply (VIN), and NMOS tube (N1) and the first PMOS tube (P1) are in off state；8th resistance
(R8), the unlatching circuit of the 9th resistance (R9) and semiconductor diode (D1) composition channel battery (VBAT), accesses battery
(VBAT) it is charged afterwards by the freewheeling diode on the second PMOS tube (P2) to source electrode (S), battery (VBAT) passes through the 8th resistance
(R8), the grid (G) of the second PMOS tube (P2) is applied to after the 9th resistance (R9) partial pressure, at this point, the source of the second PMOS tube (P2)
Voltage between pole (S) grid (G) is much larger than cut-in voltage, and the second PMOS tube (P2) is connected, meanwhile, freewheeling diode cut-off.
3. a kind of power supply selecting module according to claim 1, it is characterised in that: when external power supply (VIN) is individually powered
When, the unlatching circuit of voltage-stabiliser tube (Z1), first resistor (R1) and NMOS tube (N1) composition external power supply (VIN), external power supply
(VIN) voltage is greater than 22V, and grid (G) voltage of NMOS tube (N1) is applied to by voltage-stabiliser tube (Z1) and first resistor (R1)
About 2V, NMOS tube (N1) are opened, and then external power supply (VIN) passes through the freewheeling diode that is connected in parallel on the first PMOS tube (P1)
And second resistance (R2), 3rd resistor (R3), NMOS tube (N1) current voltage distribution, source electrode (S) grid of the first PMOS tube (P1)
(G) voltage is greater than cut-in voltage, the first PMOS tube (P1) conducting；At this point, external power supply (VIN) passes through semiconductor diode (D1)
Grid (G) voltage for being applied to the second PMOS tube (P2) will be greater than battery (VBAT) voltage and (be applied to the second PMOS tube (P2)
Source electrode (S) voltage), therefore the second PMOS tube (P2) end.
4. a kind of power supply selecting module according to claim 1, it is characterised in that: when battery (VBAT) and external power supply
(VIN) when accessing simultaneously, the voltage of external power supply (VIN) has the process of a rising, and external power supply (VIN) voltage, which rises to, to be connect
When nearly battery (VBAT) voltage, the second PMOS tube (P2) elder generation stopping, the first PMOS tube (P1) and second are leaned in load at this time
Freewheeling diode in PMOS tube (P2) maintains the work of very short time, when external power supply (VIN) voltage rises to about 22V, lead to
Crossing voltage-stabiliser tube (Z1) and first resistor (R1) makes NMOS tube (N1) to enter open state, the first PMOS tube (P1) grid (G) voltage
It is pulled low and enters open state, external power supply (VIN) starts to power；Into after external power supply (VIN) power supply, the first PMOS tube
(P1) it opens, the second PMOS tube (P2) cut-off, the freewheeling diode cut-off of the first PMOS tube (P1) and the second PMOS tube (P2).
5. a kind of power supply selecting module according to any one of claims 1-4, it is characterised in that: the first resistor
(R1), the resistance value of second resistance (R2), 3rd resistor (R3), the 8th resistance (R8) and the 9th resistance (R9) is 100K Ω.
6. a kind of power supply selecting module according to any one of claims 1-4, it is characterised in that: the battery (VBAT)
Voltage range be 8V-21V, the cut-in voltage of first PMOS tube (P1) is greater than 21V.
7. a kind of power supply selecting module according to any one of claims 1-4, it is characterised in that: two pole of semiconductor
Managing (D1) is Schottky diode BAT54C.
8. a kind of power supply selecting module according to any one of claims 1-4, it is characterised in that: first PMOS tube
(P1) and the second PMOS tube (P2) is switch time is short, conducting resistance is low semiconductor field effect transistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910895811.5A CN110535231A (en) | 2019-09-21 | 2019-09-21 | A kind of power supply selecting module |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910895811.5A CN110535231A (en) | 2019-09-21 | 2019-09-21 | A kind of power supply selecting module |
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| Publication Number | Publication Date |
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| CN110535231A true CN110535231A (en) | 2019-12-03 |
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ID=68669532
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| CN201910895811.5A Pending CN110535231A (en) | 2019-09-21 | 2019-09-21 | A kind of power supply selecting module |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114336938A (en) * | 2021-12-30 | 2022-04-12 | 北京深思数盾科技股份有限公司 | Battery power supply system and electronic equipment |
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2019
- 2019-09-21 CN CN201910895811.5A patent/CN110535231A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114336938A (en) * | 2021-12-30 | 2022-04-12 | 北京深思数盾科技股份有限公司 | Battery power supply system and electronic equipment |
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