CN106787130A - A kind of power supply switch circuit and terminal - Google Patents
A kind of power supply switch circuit and terminal Download PDFInfo
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- CN106787130A CN106787130A CN201611183605.4A CN201611183605A CN106787130A CN 106787130 A CN106787130 A CN 106787130A CN 201611183605 A CN201611183605 A CN 201611183605A CN 106787130 A CN106787130 A CN 106787130A
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- 230000005669 field effect Effects 0.000 description 4
- 238000010168 coupling process Methods 0.000 description 3
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- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
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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
- 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
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Abstract
The embodiment of the invention provides a kind of power supply switch circuit, wherein, the power supply switch circuit include correspondence electric connection external power source, internal electric source, with reference to voltage-stabilizing controller, the first FET and the second FET；When the external power source normal work, if the input of the reference voltage-stabilizing controller is used to be input into the voltage more than preset first threshold value, first FET is turned on, second FET is closed, to close the internal electric source；When the external power source is used to export the DC voltage VDD less than default Second Threshold, first FET is turned on, second FET is turned on, to open the internal electric source；So it is capable of achieving the automatic switchover of power supply, it is to avoid in the prior art when power supply switches because spread of voltage causes the problem that external equipment restarts.
Description
Technical field
The present invention relates to electronic circuit technology field, more particularly to a kind of power supply switch circuit and terminal device.
Background technology
With the continuous improvement continued to develop with people's living standard of terminal technology, increasing terminal device occurs
In people's daily life, but these terminal devices are typically all its powered operation using internal electric source (battery).For example,
Battery or car-mounted terminal (golo2G) internal cell in electric motor car is charged, it is necessary to pass through interface/joint by external power source, or
By the direct powered operation of external power source.However, the power supply switching for how realizing external power supply and internal cell is a problem.
In practice, it has been found that due to the limitation of these terminal device volumes, it is impossible to increase storage capacitor；When external power source is moved
When going out, because without big storage capacitor, external power source jump falls quickly, is switched to internal electric source power-on time slow and interior
When portion's power supply powers not anxious, equipment can be caused to restart or power off；On the other hand, internal electric source (battery) power supply is being used alone
When, if accessing external power source, now there is a problem of that power supply switching is too fast, can cause equipment to be restarted again.Therefore one kind is needed
The power supply switch circuit of stabilization.
The content of the invention
Embodiment of the present invention technical problem to be solved is, there is provided a kind of power supply switch circuit and terminal device, can
The problem for avoiding causing external equipment to be restarted due to spread of voltage when power supply switches, while also realizing the automatic of internal electric source
Switching.
In a first aspect, the embodiment of the present invention is disclosed there is provided a kind of power supply switch circuit, the power supply switch circuit includes
External power source and internal electric source, the power supply switch circuit are also included with reference to voltage-stabilizing controller, the first FET and second
Effect pipe, the reference voltage-stabilizing controller includes input and the first output end, the internal electric source and first field-effect
The source electrode of pipe is electrically connected with, and the first output end of the reference voltage-stabilizing controller electrically connects with the grid of first FET
Connect, the drain electrode of first FET is electrically connected with the drain electrode of second FET, second FET
The input of grid and the reference voltage-stabilizing controller is electrically connected with the external power source respectively, second FET
Source electrode is electrically connected with external equipment；
When the external power source normal work, for exporting during DC voltage VDD, if the reference voltage-stabilizing controller is defeated
Enter end for being input into the voltage more than preset first threshold value, then turn on first FET, close second field-effect
Pipe, to close the internal electric source, prevents the voltage output of the internal electric source, and the output voltage of the external power source is used to drive
Move the external equipment；
When the external power source does not work or the external power source is used to export the DC voltage less than default Second Threshold
During VDD, first FET is turned on, turn on second FET；To open the internal electric source, the internal electricity
The output voltage in source is used to drive the external equipment.
Wherein alternatively, the input of the reference voltage-stabilizing controller also electrically connects with the switch control pin of master controller
Connect, the switch control pin of the master controller is used to export predeterminated voltage to control cut-offfing for internal electric source；
When the switch control pin of the master controller is used to export low level control signal, the reference voltage stabilizing control
The input of device is used to be input into the voltage no more than default 3rd threshold value, closes first FET, to close in described
Portion's power supply, prevents the voltage output of the internal electric source.
Wherein alternatively,
When the internal electric source works, if the out-put supply of the internal electric source is less than default Second Threshold or described interior
Be present short circuit in portion's power supply, then be input into no more than default 3rd threshold value by controlling the input of the reference voltage-stabilizing controller to be used for
DC voltage, to close the internal electric source, prevent the voltage output of the internal electric source.
Wherein alternatively,
When the internal electric source normal work, and when accessing the external power source, then second FET is closed, led
The logical body diode being connected across between the drain electrode of second FET and source electrode, is worked with by the internal electric source, defeated
Go out voltage for driving the external equipment；
The direct current for external equipment work described in driven is reached in the output voltage for detecting the external power source
During voltage, completely close the internal electric source and close described in be connected across second FET drain electrode and source electrode it
Between body diode, with by the output voltage of the external power source be used for drive the external equipment.
Wherein alternatively, the circuit also includes first resistor and second resistance, the input of the reference voltage-stabilizing controller
End is electrically connected with one end of the first resistor and second resistance respectively, and the other end of the first resistor external sets with described
Standby to be electrically connected with, the other end of the second resistance is connected with the earth.
Wherein alternatively, the reference voltage-stabilizing controller also includes the second output end, and the circuit also includes electric capacity, described
Electric capacity is connected in parallel on input and the second output end two ends of the reference voltage-stabilizing controller.
Wherein alternatively, the circuit also includes 3rd resistor and the 4th resistance, the first of the reference voltage-stabilizing controller
Output end is electrically connected with by the 3rd resistor with the grid of first FET, and the 4th resistance is connected across described
With reference to the source electrode two ends of the first output end and first FET of voltage-stabilizing controller.
Wherein alternatively, the circuit also includes the 5th resistance, the 6th resistance and voltage-regulator diode, the external power source
It is electrically connected with the grid of second FET by the 5th resistance, and the grid of second FET passes through
6th resistance and voltage-regulator diode are connected with the earth respectively.
Wherein alternatively, the reference voltage-stabilizing controller includes controllable accurate voltage-stabilized power supply.
Second aspect, the embodiment of the present invention is also disclosed there is provided a kind of terminal device, and the terminal device includes：As above
Power supply switch circuit described in any one of one side.
As can be seen that the embodiment of the present invention is disclosed there is provided a kind of power supply switch circuit, the power supply switch circuit is included
External power source, internal electric source, with reference to voltage-stabilizing controller, the first FET and the second FET, the internal electric source difference
It is electrically connected with the reference voltage-stabilizing controller and the first FET, first FET and the second FET are electrical
Connect, and second FET is electrically connected with the external power source and external equipment respectively；When the external power source just
Often during work, if the input of the reference voltage-stabilizing controller is used to be input into the voltage more than preset first threshold value, institute is turned on
The first FET is stated, second FET is closed, to close the internal electric source, the voltage of the internal electric source is prevented
Output；When the external power source is used to export the DC voltage VDD less than default Second Threshold, first field-effect is turned on
Pipe, turns on second FET, and to open the internal electric source, the output voltage of the internal electric source is described for driving
External equipment；So it is capable of achieving the automatic switchover of power supply, it is to avoid in the prior art when power supply switches because spread of voltage is led
The problem for causing external equipment to restart.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
The accompanying drawing to be used needed for having technology description is briefly described, it should be apparent that, drawings in the following description are only this
Some embodiments of invention, for those of ordinary skill in the art, on the premise of not paying creative work, can be with
Other accompanying drawings are obtained according to these accompanying drawings.
Fig. 1 is a kind of schematic diagram of power supply switch circuit in the prior art；
Fig. 2 is a kind of structural representation of power supply switch circuit of the embodiment of the present invention；
Fig. 3 is a kind of schematic diagram of power supply switch circuit of the embodiment of the present invention；
Fig. 4 is a kind of schematic equivalent circuit of reference voltage-stabilizing controller of the embodiment of the present invention.
Specific embodiment
In order that those skilled in the art more fully understand the present invention program, below in conjunction with the embodiment of the present invention
Accompanying drawing, is clearly and completely described to the technical scheme in the embodiment of the present invention, it is clear that described embodiment is only
The embodiment of a part of the invention, rather than whole embodiments.Based on the embodiment in the present invention, ordinary skill people
The every other embodiment that member is obtained under the premise of creative work is not made, should all belong to the model of present invention protection
Enclose.
Term " first ", " second " and " the 3rd " in description and claims of this specification and above-mentioned accompanying drawing is (such as
Fruit exist) etc. be for distinguishing different objects, not for description particular order.Additionally, term " including " and they are any
Deformation, it is intended that covering is non-exclusive to be included.For example contain process, method, system, the product of series of steps or unit
Or equipment is not limited to the step of having listed or unit, but alternatively also include the step of not listing or unit, or can
Selection of land also includes for these processes, method, product or other intrinsic steps of equipment or unit.
Fig. 1 is referred to, is a kind of schematic diagram of power supply switch circuit in the prior art, be described below of the prior art
Power supply switch circuit, the power supply switch circuit includes the first FET Q1, the second FET Q2, wherein the first FET
Source electrode and internal electric source (battery Battery, Bat) be electrically connected with, drain electrode and second FET of the first FET
The source electrode of drain electrode electric connection, source electrode and the external equipment electric connection of the second FET, or second FET
For exporting the voltage V_out for external equipment work.Additionally, the grid of Q1 is electric with 47k Ω (kilo-ohm) respectively with the grid of Q2
One end of resistance, 100k Ω resistance and voltage-regulator diode D1 are electrically connected with, and the grid of Q1 is electrically connected with the grid of Q2,
The other end of 100k Ω resistance and voltage-regulator diode D1 is connected with the earth respectively, and in actual product, the other end of D1 is used for
Input grounding signal.The other end of the other end and external power source the VDD electric connection of 47k Ω resistance, or 47k Ω resistance simultaneously
For being input into the DC voltage VDD that the external power source is exported.In the prior art, when internal electric source is currently being used, if this
When access external power source, now due to detecting external power source, internal battery powers can be immediately turned off, power supply switch circuit switching
It is too fast, but direct current transducer DCDC controllers need certain startup time when external power source is powered, now DCDC controls
Device also without normal output power supply, will cause power supply instability, cause equipment to be restarted.
It is the embodiment of the present invention referring now to Fig. 2 to solve the problems, such as that there is equipment in above-mentioned power supply switch circuit restarts
Disclosed in the structural representation of a kind of power supply switch circuit that provides, the structural representation includes external power source (VDD
Input), DCDC controllers 1, DCDC controllers 2, internal electric source charging module, i.e. battery charging module (Battry
Charger), internal electric source, i.e. battery (Battry) and power supply handover module, the power supply handover module are used for outside output driving
Meet the voltage V_out of equipment work.
Exemplarily, outside power vd D Input can be for exporting 12V direct currents in whole power supply switch circuit
Power supply on onboard diagnostic system (On-Board Diagnostic, OBD) seat of the VDD in source, such as automobile.DCDC controllers 1 can
Think the direct current transducer of 12V To 3.8V/4V, i.e., for outside 12V direct-current input power supplyings to be converted into 3.8V dc sources,
Powered to external equipment.DCDC controllers 2 can be the direct current transducer of 12V To 5V, i.e., for outside 12V direct currents to be input into
Power convert is 5V dc sources, supplies external equipment and is charged to internal electric source.In internal electric source charging module includes
The charging circuit of portion's power supply, due to not being the emphasis of present invention concern, is not detailed here.Internal electric source can refer to battery,
The device for power supply such as battery, lithium battery.Power supply handover module includes power supply switch circuit, for controlling internal electric source
Power supply with external power supply is used.
Fig. 3 is referred to, is a kind of schematic diagram of the power supply switch circuit provided disclosed in the embodiment of the present invention, the power supply is cut
Circuit is changed to include external power source VDD and internal electric source Bat and also include with reference to voltage-stabilizing controller U1, the first FET
Q1 and the second FET Q2, the reference voltage-stabilizing controller U1 include input 1, the first output end 2 and the second output end 3,
The source electrode of the internal electric source Bat and the first FET Q1 is electrically connected with, and the first of the reference voltage-stabilizing controller is defeated
Go out end to be electrically connected with the grid of first FET, drain electrode and second field-effect of the first FET Q1
The drain electrode of pipe Q2 is electrically connected with, and grid and the external power source VDD of the second FET Q2 are electrically connected with, and described second
The input 1 of the source electrode of FET Q2 and the reference voltage-stabilizing controller U1 is electrically connected with external equipment respectively；
When the external power source VDD normal works, for exporting during DC voltage VDD, if the reference voltage-stabilizing controller
Input 1 be used to be input into the voltage more than preset first threshold value, then turn on the first FET Q1, close described second
FET Q2, to close the internal electric source Bat, prevents the voltage output of the internal electric source, the external power source it is defeated
Go out voltage for driving the external equipment；
When the external power source VDD does not work or the external power source is used to export the direct current less than default Second Threshold
During pressure VDD, the first FET Q1 is turned on, turn on the second FET Q2；It is described to open the internal electric source
The output voltage of internal electric source is used to drive the external equipment.
Wherein alternatively, the reference voltage-stabilizing controller U1 input 1 can also and master controller
The switch control pin Battery_ctrl of (Microcontroller Unit, MCU) is electrically connected with, and Battery_ctrl is used for
MCU exports predeterminated voltage to control the unlatching/closing (referred to as cut-off, break-make or switch) of builtin voltage Bat.Ordinary circumstance
Under, to reduce the interference of MCU, Battery_ctrl is typically configured to/is in vacant state, now do not influenceing internal electric source just
Often work power supply；When needing control to close internal electric source Bat, it is necessary to Battery_ctrl is used to export low level voltage, such as
Output zero level, to control the closing of internal electric source.
Wherein alternatively, the circuit also includes first resistor R1 and second resistance R2, the reference voltage-stabilizing controller U1
Input 1 be electrically connected with one end of the first resistor R1 and second resistance R2 respectively, the first resistor R1's is another
End is electrically connected with the external equipment, and the other end of the second resistance R2 is connected with the earth；In actual product, R2's is another
One end is used for input grounding signal.
Wherein alternatively, the circuit is also connected in parallel on the second resistance R2 two ends including electric capacity C1, the electric capacity C1, or
The input 1 of the reference voltage-stabilizing controller U1 and the two ends of the second output end 3 of the reference voltage-stabilizing controller U1 are connected in parallel on, its
Purpose is：For filtering during interference, such as MCU positive returns, the level saltus step of Battery_ctrl switch control pins, or
When internally power supply is individually powered, increase the voltage jump for causing suddenly due to external equipment (external loading) and fall.The appearance of C1 electric capacity
Value is with according to theoretical calculation and actual test more preferably greater than 1uF.
Wherein alternatively, the circuit also includes 3rd resistor R3 and the 4th resistance R4, the reference voltage-stabilizing controller U1
The first output end 2 be electrically connected with by the grid of the 3rd resistor R3 and the first FET Q1, the 4th electricity
Resistance Q4 is connected across the first output end 2 of the reference voltage-stabilizing controller and the source electrode two ends of the first FET Q1.
Wherein alternatively, the circuit also includes the 5th resistance R5, the 6th resistance R6 and voltage-regulator diode D3, described outer
Portion power supply Bat is electrically connected with by the grid of the 5th resistance R5 and the second FET Q2, and second effect
Should pipe Q2 grid by the 6th resistance R6 and voltage-regulator diode D3 respectively with the earth be connected, the D3 in actual product
The other end is used for input grounding signal.
Wherein alternatively, the reference voltage-stabilizing controller U1 includes controllable accurate voltage-stabilized power supply, for details, reference can be made to such as Fig. 4 institutes
Show the schematic equivalent circuit of the reference voltage-stabilizing controller for providing, that is to say that the equivalent circuit diagram of the controllable accurate voltage-stabilized power supply can
Referring to Fig. 4, the wherein controllable accurate voltage-stabilized power supply can include CJ431, TL431, or other have as shown in Figure 4 with phase
With other components of equivalent circuit function, the embodiment of the present invention is not construed as limiting.
It should be noted that said external power vd D is used to export the DC voltage VDD of 12V, it is used to control list herein
Individual FET is Q2, by the partial pressure of R5 and R6, when voltage jump falls about 5V (being about 5V at the grid of Q2) herein, Q2
To open, be powered to external equipment by internal electric source.External equipment V_out:Power source loads are that is to say, internal electric source is by cutting
Circuit is changed to be powered to (external equipment) herein；When there is external power source, external power source is changed by DCDC controllers and produces use
In the voltage for driving external equipment work, external power source is powered for external equipment, internal electric source is powered will turn off.U1 is controllable essence
Close voltage-stabilized power supply, the alternative material of same model is TL431 etc..Internal equivalent circuit can be referring specifically to as shown in figure 4, wherein compare
The negative terminal of device is the reference voltage of 2.5V, and only when REF inputs are more than 2.5V, comparator is output as height, drives the pole of rear end three
Pipe is turned on, and now first output end 1 (CATHODE, CA (K)) and the second output end 2 (ANODE, AN (A)) of U1 are led and alived
Flow through.R1 and R2 partial pressures, when being more than 3.23V with operating voltage when ensureing that internal electric source is powered, the voltage at the REF pin of U1
More than 2.5V, to control Q1 to turn on.Wherein, Q1 and Q2 is the switch that power supply switch circuit controls FET, works as internal electric source
Output services voltage when being more than 3.23V, turn on Q1, internal electric source powers；When external power source is input into 12V voltages, Q2 is turned on,
External voltage is powered.
The embodiment of the present invention does not have tight to the parameter of each component in a kind of power supply switch circuit for being given shown in Fig. 3
The requirement of lattice, preferably middle R4 shown in Fig. 3 can be the resistance of 2k Ω in embodiments of the present invention, and C1 can be the pole of 1 microfarad
Property electric capacity (such as 2.2 microfarads).Wherein, R1, R2, R3, R4 be without special requirement, may for different internal electric source or
Equipment requirement, the voltage that correspondence is required can be different.The parameter of the remaining component in shown in Fig. 3 is as follows respectively：R1 can be
The resistance of 13.7k Ω, R2 and R5 can be the resistance of 47k Ω, and R3 can be able to be the electricity of 100k Ω for the resistance of 10k Ω, R6
Resistance；Q1 and Q2 can be that rated voltage/electric current is the PMOS (FET of P-channel) of 20V/2A.
A kind of concrete operating principle of the power supply switch circuit provided below for the present invention is described in detail and explanation.
When external equipment normal work, the output voltage of V_out is 4V, now the REF pins of U1 originally by R1 and
The voltage being input into after R2 partial pressures is higher than 2.5V so that A the and K pin of U1 have electric current to flow through, and now R5 and R6 both end voltages are more than
The threshold voltage of Q1 conductings so that Q1 is turned on；Meanwhile, now there is the power input of 12V due to external voltage VDD, then Q2 can quilt
Shut-off/cut-off, reaches the function of the output voltage of shut-off internal electric source.
As removal external power source VDD, or when the output voltage of external power source is less than 5V, now Q2 will be turned on/opened,
Internal electric source will provide power supply to external equipment (external load), for external equipment normal work.In the present invention program
, higher than in the case of 3.23V, Q1 will be in the conduction state for the output voltage of internal electric source, now in power supply switch circuit or is cutting
The break-make for needing to control Q2 when internal electric source is powered is changed, needs to open simultaneously compared to power supply switch circuit in the prior art
Two-way fet switch (Q1 and Q2), speed of the power supply switch circuit provided in an embodiment of the present invention when realizing that power supply switches
Can faster.
When exclusive use internal electric source battery powers (i.e. internal electric source normal work), if internal electric source works, and
When the output voltage of internal electric source is less than 3.23V (when that is to say that internal electric source electricity is too low or short-circuit), A the and K poles of U1 will
Shut-off, Q1 is turned off, and the automatic breaking inner power supply of power supply switch circuit is powered, and reaches the function of protection internal electric source.If interior
Portion's power work, and the output voltage of internal electric source is when being higher than 3.23V, during the independent normal work of internal electric source, if plugging outside
Power supply, now Q2 will be turned off/ended, but drain electrode due to Q2 and the body diode D2 that exists between the grid of Q2, in DCDC
When controller is not exported normally also, internal electric source can persistently give external equipment/load supplying, until DCDC is normally output as 4V
When, the body diode D2 between Q2 drain and gates will end, and complete switch off the power supply of internal electric source.
Before except this, when external power source is individually powered, there is MCU in the prior art interior due to being turned off when power supply is unstable
Portion's power supply is powered insecure situation, in embodiments of the present invention due to the presence of U1, as long as the output electricity at the REF pins of U1
Pressure is pulled down to below 2.5V, and all reliable shut-off builtin voltage is powered, and the suitable shunt capacitance C1 of simultaneous selection can be more reliable
Filter from MCU due to reset or other reasons caused by interference (unexpected load current increase).
As can be seen that in the embodiment of the present invention internally power supply output voltage instability or it is too low in the case of can carry out
Reliable shut-off, and power supply handoff functionality is reliably achieved, while the too low and short-circuit protection of internal power source voltage is realized, so that
Ensure the safety using the terminal device product corresponding to this kind of power supply switch circuit.
The embodiment of the present invention is also disclosed a kind of terminal device of offer, and the terminal device will be given using as shown in figure 3 above
A kind of power supply switch circuit, referring specifically to such as figure 1 above-Fig. 4 correspondence embodiment in related function module or implement component
Description, will not be described here.
The terminal device can be including smart mobile phone (such as Android phone, IOS mobile phones), PC, flat board electricity
Brain, palm PC, mobile internet device (MID, Mobile Internet Devices) or wearable intelligent equipment etc. are interconnected
Net equipment, the embodiment of the present invention is not construed as limiting.
It should be noted that for foregoing each method embodiment, in order to be briefly described, therefore it is all expressed as a series of
Combination of actions, but those skilled in the art should know, the present invention not by described by sequence of movement limited because
According to the present invention, some steps can sequentially or simultaneously be carried out using other.Secondly, those skilled in the art should also know
Know, embodiment described in this description belongs to preferred embodiment, involved action and module is not necessarily of the invention
It is necessary.
In the above-described embodiments, the description to each embodiment all emphasizes particularly on different fields, and does not have the portion described in detail in certain embodiment
Point, may refer to the associated description of other embodiment.
In several embodiments provided herein, it should be understood that disclosed device, can be by another way
Realize.For example, device embodiment described above is only schematical, such as the division of described unit is only one kind
Division of logic function, can there is other dividing mode when actually realizing, such as multiple units or component can combine or can
To be integrated into another system, or some features can be ignored, or not perform.It is another, it is shown or discussed each other
Coupling or direct-coupling or communication connection can be the INDIRECT COUPLING or communication connection of device or unit by some interfaces,
Can be electrical or other forms.
The unit that is illustrated as separating component can be or may not be it is physically separate, it is aobvious as unit
The part for showing can be or may not be physical location, you can with positioned at a place, or can also be distributed to multiple
On NE.Some or all of unit therein can be according to the actual needs selected to realize the mesh of this embodiment scheme
's.
In addition, each functional unit in various embodiments of the present invention can be integrated in a processing unit, also may be used
Being that unit is individually physically present, it is also possible to which two or more units are integrated in a unit.It is above-mentioned integrated
Unit can both be realized in the form of hardware, it would however also be possible to employ the form of SFU software functional unit is realized.
If the integrated unit is to realize in the form of SFU software functional unit and as independent production marketing or use
When, can store in a computer read/write memory medium.Based on such understanding, technical scheme is substantially
The part for being contributed to prior art in other words or all or part of the technical scheme can be in the form of software products
Embody, the computer software product is stored in a storage medium, including some instructions are used to so that a computer
Equipment (can be personal computer, server or network equipment etc.) perform each embodiment methods described of the invention whole or
Part steps.And foregoing storage medium includes：USB flash disk, read-only storage (ROM, Read-Only Memory), arbitrary access are deposited
Reservoir (RAM, Random Access Memory), mobile hard disk, magnetic disc or CD etc. are various can be with store program codes
Medium.
The above, the above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although with reference to preceding
Embodiment is stated to be described in detail the present invention, it will be understood by those within the art that：It still can be to preceding
State the technical scheme described in each embodiment to modify, or equivalent is carried out to which part technical characteristic；And these
Modification is replaced, and does not make the scope of the essence disengaging various embodiments of the present invention technical scheme of appropriate technical solution.
Claims (10)
1. a kind of power supply switch circuit, the power supply switch circuit includes external power source and internal electric source, it is characterised in that described
Power supply switch circuit is also included with reference to voltage-stabilizing controller, the first FET and the second FET, the reference voltage stabilizing control
Device includes input and the first output end, and the internal electric source is electrically connected with the source electrode of first FET, the ginseng
The grid of the first output end and first FET of examining voltage-stabilizing controller is electrically connected with, the leakage of first FET
Pole is electrically connected with the drain electrode of second FET, and grid and the external power source of second FET electrically connect
Connect, the input of the source electrode of second FET and the reference voltage-stabilizing controller is electrically connected with external equipment respectively；
When the external power source normal work, for exporting during DC voltage VDD, if the input of the reference voltage-stabilizing controller
For being input into the voltage more than preset first threshold value, then first FET is turned on, close second FET, with
The internal electric source is closed, the voltage output of the internal electric source is prevented, the output voltage of the external power source is used to drive institute
State external equipment；
When the external power source does not work or the external power source is used to export the DC voltage VDD less than default Second Threshold
When, first FET is turned on, turn on second FET；To open the internal electric source, the internal electric source
Output voltage be used for drive the external equipment.
2. power supply switch circuit according to claim 1, it is characterised in that the input of the reference voltage-stabilizing controller is also
Be electrically connected with the switch control pin of master controller, the switch control pin of the master controller be used to exporting predeterminated voltage with
Control cut-offfing for internal electric source；
When the switch control pin of the master controller is used to export low level control signal, the reference voltage-stabilizing controller
Input is used to be input into the voltage no more than default 3rd threshold value, closes first FET, to close the internal electricity
Source, prevents the voltage output of the internal electric source.
3. power supply switch circuit according to claim 1, it is characterised in that
When the internal electric source works, if the out-put supply of the internal electric source is less than default Second Threshold or the internal electricity
There is short circuit in source, then straight no more than default 3rd threshold value by controlling the input of the reference voltage-stabilizing controller to be used for input
Stream voltage, to close the internal electric source, prevents the voltage output of the internal electric source.
4. power supply switch circuit according to claim 1, it is characterised in that
When the internal electric source normal work, and when accessing the external power source, then close second FET, conducting across
The body diode between the drain electrode of second FET and source electrode is connected on, is worked with by the internal electric source, output electricity
Press for driving the external equipment；
The DC voltage for external equipment work described in driven is reached in the output voltage for detecting the external power source
When, completely close and be connected across between drain electrode and the source electrode of second FET described in the internal electric source and closing
Body diode, with by the output voltage of the external power source be used for drive the external equipment.
5. power supply switch circuit according to claim 1, it is characterised in that the circuit also includes first resistor and second
Resistance, the input of the reference voltage-stabilizing controller is electrically connected with one end of the first resistor and second resistance respectively, institute
The other end and the external equipment for stating first resistor are electrically connected with, and the other end of the second resistance is connected with the earth.
6. power supply switch circuit according to claim 5, it is characterised in that the reference voltage-stabilizing controller also includes second
Output end, the circuit also includes electric capacity, and the electric capacity is connected in parallel on input and second output of the reference voltage-stabilizing controller
End two ends.
7. power supply switch circuit according to claim 1, it is characterised in that the circuit also includes 3rd resistor and the 4th
Resistance, the first output end of the reference voltage-stabilizing controller is electric with the grid of first FET by the 3rd resistor
Property connection, the 4th resistance is connected across the first output end of the reference voltage-stabilizing controller and the source of first FET
Pole two ends.
8. power supply switch circuit according to claim 1, it is characterised in that the circuit also includes the 5th resistance, the 6th
Resistance and voltage-regulator diode, the external power source are electrically connected by the 5th resistance with the grid of second FET
Connect, and the grid of second FET is connected with the earth respectively by the 6th resistance and voltage-regulator diode.
9. the power supply switch circuit according to any one of claim 1-8, it is characterised in that the reference voltage-stabilizing controller
Including controllable accurate voltage-stabilized power supply.
10. a kind of terminal device, it is characterised in that the terminal device is included any one of as above claim 1-9
Power supply switch circuit.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201611183605.4A CN106787130B (en) | 2016-12-20 | 2016-12-20 | A kind of power supply switch circuit and terminal |
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| CN201611183605.4A CN106787130B (en) | 2016-12-20 | 2016-12-20 | A kind of power supply switch circuit and terminal |
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| CN106787130B CN106787130B (en) | 2019-08-02 |
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| CN201611183605.4A Active CN106787130B (en) | 2016-12-20 | 2016-12-20 | A kind of power supply switch circuit and terminal |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108565961A (en) * | 2018-06-11 | 2018-09-21 | 瑞纳智能设备股份有限公司 | There is one kind counnter attack to fill power supply automatic switchover without crushing output circuit |
| CN108599357A (en) * | 2018-01-30 | 2018-09-28 | 广州小鹏汽车科技有限公司 | A kind of vehicle-mounted data terminal power supply switch circuit |
| CN109038726A (en) * | 2018-08-01 | 2018-12-18 | 普联技术有限公司 | Single channel multi-voltage power supply multiplex system and method |
| CN110071538A (en) * | 2019-03-01 | 2019-07-30 | 安徽力高新能源技术有限公司 | Power supply abnormity detection method in a kind of battery management system |
| CN112885301A (en) * | 2021-01-20 | 2021-06-01 | 维沃移动通信有限公司 | Switching circuit, switching method and display device |
| CN117148780A (en) * | 2023-11-01 | 2023-12-01 | 深圳和润达科技有限公司 | PLC input/output polarity automatic switching device, switching method and electronic equipment |
| CN117811161A (en) * | 2024-01-05 | 2024-04-02 | 武汉美格科技股份有限公司 | Control device of trickle device for vehicle |
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| CN108599357A (en) * | 2018-01-30 | 2018-09-28 | 广州小鹏汽车科技有限公司 | A kind of vehicle-mounted data terminal power supply switch circuit |
| CN108565961A (en) * | 2018-06-11 | 2018-09-21 | 瑞纳智能设备股份有限公司 | There is one kind counnter attack to fill power supply automatic switchover without crushing output circuit |
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| CN112885301B (en) * | 2021-01-20 | 2022-04-01 | 维沃移动通信有限公司 | Switching circuit, switching method and display device |
| CN117148780A (en) * | 2023-11-01 | 2023-12-01 | 深圳和润达科技有限公司 | PLC input/output polarity automatic switching device, switching method and electronic equipment |
| CN117148780B (en) * | 2023-11-01 | 2024-01-26 | 深圳和润达科技有限公司 | PLC input/output polarity automatic switching device, switching method and electronic equipment |
| CN117811161A (en) * | 2024-01-05 | 2024-04-02 | 武汉美格科技股份有限公司 | Control device of trickle device for vehicle |
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| Publication number | Publication date |
|---|---|
| CN106787130B (en) | 2019-08-02 |
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