CN209419314U - A kind of double power supply circuit - Google Patents
A kind of double power supply circuit Download PDFInfo
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- CN209419314U CN209419314U CN201920280112.5U CN201920280112U CN209419314U CN 209419314 U CN209419314 U CN 209419314U CN 201920280112 U CN201920280112 U CN 201920280112U CN 209419314 U CN209419314 U CN 209419314U
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- power supply
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- feeder ear
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Abstract
The utility model embodiment discloses a kind of double power supply circuit.The double power supply circuit includes: that the first end of one-way conduction module is electrically connected with second source feeder ear, and second end is electrically connected with power supply output end, and one-way conduction module is used to be connected when the voltage of second source feeder ear is higher than the voltage of power supply output end；The first end of transistor is electrically connected with the first power supply side, and second end is electrically connected with power supply output end；The reference voltage input terminal of transistor driving module, transistor driving module is electrically connected with power supply output end；Feedback voltage input terminal is electrically connected with second source feeder ear；Drive output is electrically connected with the control terminal of transistor；Ground terminal ground connection.The utility model embodiment realizes the switching of duplex feeding power supply using controllable transistor, so as to avoid the risk that power loss occurs in handoff procedure, improves the reliability of double power supply circuit, and extend the service life of double power supply circuit.
Description
Technical field
The utility model embodiment is related to technical field of battery management more particularly to a kind of double power supply circuit.
Background technique
Dual power supply refers to a load, and there are two power supply power supply circuits, and can cut between two power supply power supply circuits
Change, in the case where a wherein power loss can with switching to another power supply power supply, or two power supplys have electricity
In the case of can choose one of power supply power supply.With the extensive use of electronic product, double power supply circuit is widely applied
In fields such as electric car, battery truck, robot and the unmanned planes for being configured with battery.
In the prior art, double power supply circuit realizes that two power supply power supplies are returned using the mechanical relay of single-pole double throw
The switching on road.However, the problem of mechanical relay turn-on time is long, response speed is slow and switch contact is easy aging, therefore, adopts
There is a problem of that risk, reliability that power loss is easy to happen in handoff procedure are low and the service life is short with the scheme of mechanical relay.
Utility model content
The utility model provides a kind of double power supply circuit, to promote the reliability of double power supply circuit, Yi Jiyan
The service life of long double power supply circuit.
The utility model embodiment provides a kind of double power supply circuit, and the double power supply circuit includes: first
Power supply side, second source feeder ear and power supply output end；
One-way conduction module, the first end of the one-way conduction module are electrically connected with the second source feeder ear, and second
End is electrically connected with the power supply output end, and the one-way conduction module is used to be higher than institute in the voltage of the second source feeder ear
Conducting when stating the voltage of power supply output end；
Transistor, the first end of the transistor are electrically connected with first power supply side, second end and the power supply
Output end electrical connection；
Transistor driving module, the transistor driving module include reference voltage input terminal, feedback voltage input terminal, drive
Dynamic output and ground；The reference voltage input terminal is electrically connected with the power supply output end；The feedback voltage input terminal
It is electrically connected with the second source feeder ear；The drive output is electrically connected with the control terminal of the transistor；The ground connection
End ground connection.
Optionally, the transistor driving module further include:
Submodule is divided, the first end of the partial pressure submodule is electrically connected with the power supply output end, second end ground connection, point
Pressure output end is electrically connected with the control terminal of the transistor, and the partial pressure submodule is used to power in the second source feeder ear
The transistor turns are controlled when stopping；
End submodule, it is described cut-off submodule first end be electrically connected with the second source feeder ear, second end and
The control terminal of the transistor is electrically connected, and the cut-off submodule is used in second source feeder ear power supply described in control
Transistor shutdown.
Optionally, the partial pressure submodule further include:
First resistor, the first end of the first resistor with it is described partial pressure submodule first end be electrically connected, second end and
The partial pressure output end electrical connection of the partial pressure submodule；
Second resistance, the first end of the second resistance are electrically connected with the partial pressure output end of the partial pressure submodule, and second
End ground connection.
Optionally, the ratio of the resistance value of the resistance value and second resistance of the first resistor is more than or equal to 1.
Optionally, the resistance value of the first resistor and the second resistance is all larger than equal to 200k Ω.
Optionally, the transistor is metal-oxide-semiconductor.
Optionally, the cut-off submodule further includes first diode, the anode of the first diode and described second
Power supply side electrical connection, cathode are electrically connected with the control terminal of the transistor.
Optionally, the double power supply circuit further includes the second diode, the anode of second diode with it is described
The electrical connection of first power supply side, cathode are electrically connected with the power supply output end.
Optionally, the one-way conduction module further includes third diode, the anode of the third diode and described the
The electrical connection of two power supply sides, cathode are electrically connected with the power supply output end.
Optionally, the voltage of the second source feeder ear input is higher than the voltage of first power supply side input.
The first end of the utility model embodiment setting transistor is electrically connected with the first power supply side, second end and power supply
The reference voltage input terminal of output end electrical connection, transistor driving module is electrically connected with power supply output end, feedback voltage input terminal
It is electrically connected with second source feeder ear, drive output is electrically connected with the control terminal of transistor, i.e., the utility model embodiment is logical
Cross the switching of turn-on and turn-off control the first power supply and second source of control transistor.Compared with prior art, this is practical new
Type embodiment realizes the switching of duplex feeding power supply using controllable transistor, so as to avoid power loss occurs in handoff procedure
Risk improves the reliability of double power supply circuit, and extends the service life of double power supply circuit.In addition, working as
When powering output end by the first power supply power supply, the voltage of the first power supply is transmitted to power supply output end by transistor, transistor and
Diode is compared, and has extremely low conduction voltage drop, to be conducive to promote transfer efficiency, meets electric car and energy-storage battery pipe
The power applications requirement of reason system.
Detailed description of the invention
Fig. 1 is a kind of structural schematic diagram of double power supply circuit provided by the embodiment of the utility model；
Fig. 2 is the structural schematic diagram of another double power supply circuit provided by the embodiment of the utility model.
Specific embodiment
The utility model is described in further detail with reference to the accompanying drawings and examples.It is understood that herein
Described specific embodiment is used only for explaining the utility model, rather than the restriction to the utility model.It further needs exist for
It is bright, part relevant to the utility model is illustrated only for ease of description, in attached drawing rather than entire infrastructure.
The utility model embodiment provides a kind of double power supply circuit.Fig. 1 is provided by the embodiment of the utility model
A kind of structural schematic diagram of double power supply circuit.Referring to Fig. 1, the double power supply circuit include: the first power supply side 10,
Second source feeder ear 20, power supply output end 30, one-way conduction module 40, transistor Q1 and transistor driving module 50.Wherein,
The first end of one-way conduction module 40 is electrically connected with second source feeder ear 20, and second end is electrically connected with power supply output end 30, single
It is used to be connected when the voltage of second source feeder ear 20 is higher than the voltage of power supply output end 30 to conduction module 40.Transistor Q1
Including first end, second end and control terminal, the first end of transistor Q1 is electrically connected with the first power supply side 10, second end and confession
Electricity output end 30 is electrically connected.Transistor driving module 50 is defeated including reference voltage input terminal 51, feedback voltage input terminal 52, driving
Outlet 53 and ground terminal 54；Reference voltage input terminal 51 is electrically connected with power supply output end 30；Feedback voltage input terminal 52 and second
Power supply side 20 is electrically connected；Drive output 53 is electrically connected with the control terminal of transistor Q1；Ground terminal 54 is grounded.
Wherein, the first power supply side 10 for being electrically connected with the power output end of the first power supply, for example may be used by the first power supply
Think often electric power supply, i.e., the main power supply in the use process of electronic product.Second source feeder ear 20 is used for
It is electrically connected with the power output end of second source, second source can be for example charging auxiliary electric power supply, i.e., in normal electricity power supply
The not enough power supply of power supply needs for power supply when often electric power supply charges.Illustratively, it is led in electric vehicle engineering
Domain, the first power supply be Vehicular accumulator cell, second source be charging pile auxiliary electric power supply, and the ground terminal 60 of Vehicular accumulator cell with
The ground terminal 54 of transistor driving module 50 is electrically connected, the ground terminal and transistor driving module 50 of charging pile auxiliary electric power supply
Ground terminal 54 be electrically connected.Power output end 30 as the public output of the first power supply and second source to rear class circuit system
Power supply.
One-way conduction module 40 has the function of one-way conduction, and one-way conduction module 40 is set to 20 He of second source feeder ear
Between power supply output end 30, on the one hand, can be when the voltage of second source feeder ear 20 is higher than the voltage of power supply output end 30
Conducting, it is ensured that second source being capable of normal power supply；On the other hand, second source can not accessed in second source feeder ear 20
When, prevent the voltage reversal of power supply output end 30 to be conducted to second source feeder ear 20.Illustratively, one-way conduction module 40 is wrapped
Diode is included, the anode of diode is electrically connected with second source feeder ear 20, and cathode is electrically connected with power supply output end 30.
Transistor Q1 is a kind of semiconductor devices, with switching function.Transistor Q1 is different from mechanical relay, crystal
Pipe Q1 controls the turn-on and turn-off of itself using electric signal, and switching speed can be very fast.In the utility model embodiment
Using controllable transistor Q1, the turn-on and turn-off of driving transistor Q1 are controlled by transistor driving module 50, improve double electricity
The reliability and service life of source power supply circuit.Optionally, transistor Q1 is metal-oxide-semiconductor, it is therefore preferable to enhanced PMOS tube.Example
Property, the working principle of the double power supply circuit is as follows:
When the first power supply side 10 exports high level (such as 12V), second source feeder ear 20 exports low level (such as 0V)
When, the voltage of the feedback voltage input terminal 52 of transistor driving module 50 is low level, and one-way conduction module 40 is in cut-off shape
State；The voltage of first power supply side 10 is exported by the endobiosis diode of transistor Q1 to transistor driving module 50
Reference voltage input terminal 51；Transistor driving module 50 is according to the voltage of reference voltage input terminal 51 and feedback voltage input terminal 52
In 53 outputting drive voltage of drive output, transistor Q1 conducting is driven, output end 30 of powering is by the first power supply power supply.When second
When power supply side 20 exports high level (such as 13V), the voltage of the feedback voltage input terminal 52 of transistor driving module 50 is height
Level, one-way conduction module 40 are in the conductive state；Transistor driving module 50 is according to reference voltage input terminal 51 and feedback electricity
It presses the voltage of input terminal 52 in 53 outputting drive voltage of drive output, drives transistor Q1 shutdown, power supply output end 30 is by the
Two power supply power supplies.
The utility model embodiment setting transistor Q1 first end be electrically connected with the first power supply side 10, second end and
Output end 30 of powering is electrically connected, and the reference voltage input terminal 51 of transistor driving module 50 is electrically connected with power supply output end 30, instead
Feedthrough voltage input terminal 52 is electrically connected with second source feeder ear 20, and drive output 53 is electrically connected with the control terminal of transistor Q1,
The turn-on and turn-off that i.e. the utility model embodiment passes through control transistor Q1 control the switching of the first power supply and second source.With
The prior art is compared, and the utility model embodiment realizes the switching of duplex feeding power supply using controllable transistor Q1, to keep away
Exempt from the risk that power loss occurs in handoff procedure, improved the reliability of double power supply circuit, and extends dual power supply confession
The service life of circuit.In addition, the voltage of the first power supply passes through transistor when output end 30 of powering is by the first power supply power supply
Q1 is transmitted to power supply output end 30, and transistor Q1 has extremely low conduction voltage drop compared with diode, turns to be conducive to be promoted
Efficiency is changed, the power applications requirement of electric car and energy storage battery management system is met.
Fig. 2 is the structural schematic diagram of another double power supply circuit provided by the embodiment of the utility model.Referring to fig. 2,
On the basis of above-mentioned each implementation, optionally, transistor driving module 50 further include: partial pressure submodule and cut-off submodule.Point
The first end of submodule 50A is pressed to be electrically connected with power supply output end 30, second end ground connection divides the control of output end and transistor Q1
End electrical connection, partial pressure submodule 50A are used for the control transistor Q1 conducting when the power supply of second source feeder ear 20 stops.Cut-off
The first end of module 50B is electrically connected with second source feeder ear 20, and second end is electrically connected with the control terminal of transistor Q1, cut-off
Module 50B is used for the control transistor Q1 shutdown when second source feeder ear 20 is powered.Wherein, submodule 50A and crystal are divided
The endobiosis diode of pipe Q1 forms partial pressure, when partial pressure value is greater than the turn-on threshold voltage of transistor Q1 | VGS | when, transistor
Q1 conducting.Ending submodule 50B can drive the voltage transmission of second source feeder ear 20 to the control terminal of transistor Q1 brilliant
Body pipe Q1 shutdown.The utility model embodiment is by setting partial pressure submodule 50A and cut-off submodule 50B, to control transistor
The turn-on and turn-off of Q1 are equivalent to through the power supply of the first power supply and second source and drive the turn-on and turn-off of transistor Q1,
So that the structure of drive module is simple, circuit cost is advantageously reduced.
With continued reference to Fig. 2, optionally, submodule 50A is divided further include: first resistor R1 and second resistance R2.First electricity
The first end for hindering R1 is electrically connected with the first end of partial pressure submodule 50A, the partial pressure output end electricity of second end and partial pressure submodule 50A
Connection.The first end of second resistance R2 is electrically connected with the partial pressure output end of partial pressure submodule 50A, second end ground connection.This is practical new
Type embodiment is connected in series by setting first resistor R1 and second resistance R2 constitutes partial pressure submodule 50A, and circuit structure is simple,
Advantageously reduce circuit cost.
On the basis of above-mentioned each implementation, optionally, the ratio of the resistance value of the resistance value and second resistance R2 of first resistor R1
More than or equal to 1, to reduce the conduction loss of transistor Q1, the quiescent dissipation of double power supply circuit is advantageously reduced.
On the basis of above-mentioned each implementation, optionally, the resistance value of first resistor R1 and second resistance R2, which are all larger than, to be equal to
200k Ω advantageously reduces the quiescent dissipation of double power supply circuit to reduce the power consumption of division module.
With continued reference to Fig. 2, on the basis of above-mentioned each implementation, optionally, cut-off submodule 50B further includes first diode
The anode of D1, first diode D1 are electrically connected with second source feeder ear 20, and cathode is electrically connected with the control terminal of transistor Q1.This
Utility model embodiment constitutes cut-off submodule 50B by setting first diode D1, and circuit structure is simple, advantageously reduces double
The cost of power-supplying circuit.
With continued reference to Fig. 2, on the basis of above-mentioned each implementation, optionally, double power supply circuit further includes the two or two pole
Pipe D2, the anode of the second diode D2 are electrically connected with the first power supply side 10, and cathode is electrically connected with power supply output end 30.This reality
With new embodiment in this way, ensuring that the voltage of the first power supply side 10 can be transmitted to crystalline substance by the second diode D2
The reference voltage input terminal 51 of body pipe drive module 50, and the string electricity of second source and the first power supply is avoided, so that it is guaranteed that
The normal operation of transistor driving module 50, improves the reliability of double power supply circuit.
With continued reference to Fig. 2, on the basis of above-mentioned each implementation, optionally, one-way conduction module 40 further includes the three or two pole
The anode of pipe D3, third diode D3 are electrically connected with second source feeder ear 20, and cathode is electrically connected with power supply output end 30.
In the above embodiments, optionally, first diode D1, the second diode D2 and third diode D3 are Xiao
Special based diode, to advantageously reduce the switching loss and cost of double power supply circuit.
With continued reference to Fig. 2, the working principle of the double power supply circuit is, when the first power supply side 10 exports high level
(such as 12V), when second source feeder ear 20 exports low level (such as 0V), the feedback voltage input terminal 52 of transistor driving module 50
Voltage be low level, first diode D1 and third diode D3 are in off state；Second diode D2 is on shape
The voltage of state, the first power supply side 10 forms partial pressure, partial pressure by the second diode D2, first resistor R1 and second resistance R2
Value be greater than PMOS tube turn-on threshold voltage | VGS | when, PMOS tube conducting, bypass the second diode D2, power supply output end 30 by
First power supply power supply realizes lower electric conduction pressure drop and higher transfer efficiency.When second source feeder ear 20 exports high electricity
When flat (such as 13V), the voltage of the feedback voltage input terminal 52 of transistor driving module 50 is high level, first diode D1 and the
Three diode D3 are in the conductive state；The high level of second source feeder ear 20 is transmitted to the control terminal of PMOS tube, PMOS tube
The voltage difference of control terminal and second end is less than the turn-on threshold voltage of PMOS tube | VGS | when, PMOS tube shutdown, the second diode D2
Reversed cut-off realizes that reverse protection, power supply output end 30 are powered by second source.
On the basis of above-mentioned each implementation, optionally, the voltage that second source feeder ear 20 inputs is supplied higher than the first power supply
The voltage that electric end 10 inputs, in this way setting can preferentially be powered using second source so that when second source exports high level.
Note that above are only the preferred embodiment and institute's application technology principle of the utility model.Those skilled in the art's meeting
Understand, the utility model is not limited to specific embodiment described here, is able to carry out for a person skilled in the art various bright
Aobvious variation, readjustment and substitution is without departing from the protection scope of the utility model.Therefore, although passing through above embodiments
The utility model is described in further detail, but the utility model is not limited only to above embodiments, is not departing from
It can also include more other equivalent embodiments in the case that the utility model is conceived, and the scope of the utility model is by appended
Scope of the claims determine.
Claims (10)
1. a kind of double power supply circuit characterized by comprising the first power supply side, second source feeder ear and power supply
Output end；
One-way conduction module, the first end of the one-way conduction module are electrically connected with the second source feeder ear, second end with
The power supply output end electrical connection, the one-way conduction module are used to be higher than the confession in the voltage of the second source feeder ear
It is connected when the voltage at electricity output end；
Transistor, the first end of the transistor are electrically connected with first power supply side, second end and described for electricity output
End electrical connection；
Transistor driving module, the transistor driving module include reference voltage input terminal, feedback voltage input terminal, driving it is defeated
Outlet and ground terminal；The reference voltage input terminal is electrically connected with the power supply output end；The feedback voltage input terminal and institute
State the electrical connection of second source feeder ear；The drive output is electrically connected with the control terminal of the transistor；The ground connection termination
Ground.
2. double power supply circuit according to claim 1, which is characterized in that the transistor driving module further include:
Submodule is divided, the first end of the partial pressure submodule is electrically connected with the power supply output end, and second end ground connection divides defeated
Outlet is electrically connected with the control terminal of the transistor, and the partial pressure submodule, which is used to power in the second source feeder ear, to be stopped
When control the transistor turns；
End submodule, it is described cut-off submodule first end be electrically connected with the second source feeder ear, second end with it is described
The control terminal of transistor is electrically connected, and the cut-off submodule is used to control the crystal in second source feeder ear power supply
Pipe shutdown.
3. double power supply circuit according to claim 2, which is characterized in that the partial pressure submodule further include:
First resistor, the first end of the first resistor with it is described partial pressure submodule first end be electrically connected, second end with it is described
Divide the partial pressure output end electrical connection of submodule；
Second resistance, the first end of the second resistance are electrically connected with the partial pressure output end of the partial pressure submodule, the second termination
Ground.
4. double power supply circuit according to claim 3, which is characterized in that the resistance value of the first resistor and the second electricity
The ratio of the resistance value of resistance is more than or equal to 1.
5. double power supply circuit according to claim 3, which is characterized in that the first resistor and the second resistance
Resistance value be all larger than equal to 200k Ω.
6. double power supply circuit according to claim 1, which is characterized in that the transistor is metal-oxide-semiconductor.
7. double power supply circuit according to claim 2, which is characterized in that the cut-off submodule further includes the one or two
Pole pipe, the anode of the first diode are electrically connected with the second source feeder ear, the control terminal of cathode and the transistor
Electrical connection.
8. double power supply circuit according to claim 1, which is characterized in that it further include the second diode, described second
The anode of diode is electrically connected with first power supply side, and cathode is electrically connected with the power supply output end.
9. double power supply circuit according to claim 1, which is characterized in that the one-way conduction module further includes third
Diode, the anode of the third diode are electrically connected with the second source feeder ear, cathode and power supply output end electricity
Connection.
10. double power supply circuit according to claim 1, which is characterized in that the second source feeder ear input
Voltage is higher than the voltage of first power supply side input.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920280112.5U CN209419314U (en) | 2019-03-05 | 2019-03-05 | A kind of double power supply circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920280112.5U CN209419314U (en) | 2019-03-05 | 2019-03-05 | A kind of double power supply circuit |
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| Publication Number | Publication Date |
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| CN209419314U true CN209419314U (en) | 2019-09-20 |
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| CN201920280112.5U Active CN209419314U (en) | 2019-03-05 | 2019-03-05 | A kind of double power supply circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113991828A (en) * | 2021-10-26 | 2022-01-28 | 广东电网有限责任公司 | Pipe-penetrating robot and dual-power system power supply circuit thereof |
-
2019
- 2019-03-05 CN CN201920280112.5U patent/CN209419314U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113991828A (en) * | 2021-10-26 | 2022-01-28 | 广东电网有限责任公司 | Pipe-penetrating robot and dual-power system power supply circuit thereof |
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