CN110266100A - Power supply switch circuit and power-supply switching method - Google Patents
Power supply switch circuit and power-supply switching method Download PDFInfo
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- CN110266100A CN110266100A CN201910529965.2A CN201910529965A CN110266100A CN 110266100 A CN110266100 A CN 110266100A CN 201910529965 A CN201910529965 A CN 201910529965A CN 110266100 A CN110266100 A CN 110266100A
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- power source
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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
- 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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/30—Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
- Y04S20/20—End-user application control systems
Abstract
The disclosure proposes a kind of power supply switch circuit, it include: main power source input terminal, backup power source input terminal, power output end, voltage detector, timer and switching switch, wherein switching switch selects at least one of electric power and electric power of backup power source of main power source to be output to power output end to be powered by least one of the electric power of the electric power of main power source and backup power source based on the timing of the voltage of the main power source detected and timer.The disclosure also proposes a kind of power-supply switching method.Voltage detecting is combined the switching for carrying out power supply by the power supply switch circuit and switching method of the disclosure with timing, output voltage and electric current is set to keep stablizing in power supply handoff procedure, the frequent switching and backup power source power drain between main power source and backup power source are avoided, and cost is lower.
Description
Technical field
This disclosure relates to which circuit field is particularly related to power supply switch circuit and power-supply switching method.
Background technique
In such as motor vehicles during being powered using main power source and backup power source to electrical equipment, if main
There is low voltage condition in the power supply of power supply, and the backup power source that main power source is switched to such as battery or battery pack is needed to supply
Electricity.After the voltage of main power source restores normal, it is also necessary to the electric power of backup power source be switched back into the electric power of main power source, to guarantee
The stable power of electrical equipment inputs.
The switching of main power source and backup power source is completed usually using mechanical relay or controlled switch.But traditional electricity
Source switching device can not timing, or only carry out power supply switching by condition of the voltage of power supply, and power transfer device is dedicated
It in particular power source and needs to cooperate with controller, leads to higher cost.
Accordingly, there exist the demands improved to existing power supply switch circuit and switching method.
It should be noted that information is only used for reinforcing the reason to the background of the disclosure disclosed in above-mentioned background technology part
Solution, therefore may include the information not constituted to the prior art known to persons of ordinary skill in the art.
Summary of the invention
The disclosure is directed to a kind of power supply switch circuit and switching method, to solve power supply switch circuit proposed above
It can not timing, backup power source electric power may be exhausted, be exclusively used in particular power source and higher cost at least one problem.
According to the one side of the disclosure, a kind of power supply switch circuit is proposed, comprising:
Main power source input terminal is arranged to receive the electric power of main power source；
Backup power source input terminal is arranged to receive the electric power of backup power source；
Power output end is arranged to output power；
Voltage detector is arranged to detect the voltage of main power source；
Timer is connect with the voltage detector, and is arranged to the institute detected based on the voltage detector
The voltage for stating main power source carries out timing；
Switching switch, with the main power source input terminal, the backup power source input terminal, the voltage detector and the meter
When device connect, and be arranged to the voltage and the timer of the main power source that detects based on the voltage detector
Timing is output to the electric power output come at least one of electric power and the electric power of the backup power source for selecting the main power source
End by least one of the electric power of the main power source and the electric power of the backup power source to be powered.
In accordance with an embodiment of the present disclosure, the timer is arranged to drop below first in the voltage of the main power source
Start timing when threshold voltage；And the switching switch is arranged to be powered and institute when by the electric power of the main power source
When stating the voltage of main power source and dropping below the first threshold voltage, the electric power of the backup power source is output to the electric power
Output end is powered with the electric power by the backup power source.
In accordance with an embodiment of the present disclosure, the timer is arranged to rise above second in the voltage of the main power source
Timing is reset when threshold voltage, wherein the second threshold voltage is higher than the first threshold voltage；And the switching switch
It is arranged to when the electric power by the backup power source any one of is powered and meets following situations, by the master
The electric power of power supply is output to the power output end and is powered with the electric power by the main power source: on the voltage of the main power source
Rise above the second threshold voltage；The timing is greater than predetermined timing threshold value.
In accordance with an embodiment of the present disclosure, the power supply switch circuit further includes interface unit, the main power source input terminal, institute
It states backup power source input terminal and the power output end and is separately connected the main power source, the standby electricity via the interface unit
Source and external electric equipment.
In accordance with an embodiment of the present disclosure, the backup power source input terminal is inputted via switching switch with the main power source
End is parallel-connected to the power output end, wherein switching switch is MOSFET.
In accordance with an embodiment of the present disclosure, at least one of the voltage detector and the timer pass through the electric power
The power supply of output end.
According to another aspect of the present disclosure, a kind of motor vehicles, including power supply switch circuit as described above are proposed.
According to the another aspect of the disclosure, a kind of power-supply switching method is proposed, comprising:
Detect the voltage of main power source；
Voltage based on the main power source detected carries out timing；
Selected based on the voltage of the main power source detected and the timing by the main power source electric power input and
At least one of electric power input of backup power source is powered.
In accordance with an embodiment of the present disclosure, when be powered by the main power source and the voltage of the main power source drop to it is low
When first threshold voltage, selection is powered by the backup power source.
In accordance with an embodiment of the present disclosure, meter is reset when the voltage of the main power source rises above second threshold voltage
When, wherein the second threshold voltage is higher than the first threshold voltage；And when being powered by the backup power source and
When meeting any one of following situations, selection is powered by the main power source: the voltage of the main power source rises to height
In the second threshold voltage；The timing is greater than predetermined timing threshold value.
By using embodiment of the disclosure, the voltage detecting of electric power can be combined with timing and carry out power supply
Switching makes output voltage and electric current in power supply handoff procedure under the premise of guaranteeing the stable power input of external electric equipment
Middle holding is stablized, and the power drain of the frequent switching and backup power source between main power source and backup power source is avoided.According to the disclosure
Embodiment power supply switch circuit and method can also use simple circuit element multiple power sources input in the case where into
The switching of row power supply completes power supply in the case where power consumption at lower cost without control chip and structural control device
The function of switching.
It should be understood that above general description and following detailed description be only it is exemplary and explanatory, not
For limiting the scope of the present disclosure.
Detailed description of the invention
Its exemplary embodiment is described in detail by referring to accompanying drawing, the above and other feature and advantage of the disclosure will become
It is more obvious.
Fig. 1 is the illustrative diagram of the power-supply system with power supply switch circuit according to an embodiment of the present disclosure；
Fig. 2 is the exemplary block diagram according to the power supply switch circuit of embodiment of the disclosure；
Fig. 3 is to be exported in the electric power for selecting main power source as electric power according to the power supply switch circuit of embodiment of the disclosure
Illustrative diagram；
Fig. 4 is to be exported in the electric power for selecting backup power source as electric power according to the power supply switch circuit of embodiment of the disclosure
Illustrative diagram；And
Fig. 5 is the illustrative diagram according to the power-supply switching method of embodiment of the disclosure.
Specific embodiment
Exemplary embodiment is described more fully with reference to the drawings.However, exemplary embodiment can be with a variety of shapes
Formula is implemented, and is not understood as limited to embodiment set forth herein；On the contrary, thesing embodiments are provided so that the disclosure will
Fully and completely, and by the design of exemplary embodiment comprehensively it is communicated to those skilled in the art.In the figure in order to clear
It is clear, the size of subelement may be exaggerated or deformed.Identical appended drawing reference indicates same or similar knot in figure
Structure, thus the detailed description that them will be omitted.
In addition, described feature, structure or characteristic can be incorporated in one or more implementations in any suitable manner
In example.In the following description, many details are provided to provide and fully understand to embodiment of the disclosure.However,
It will be appreciated by persons skilled in the art that can be with technical solution of the disclosure without one in the specific detail or more
It is more, or can be using other methods, element etc..In other cases, be not shown in detail or describe known features, method or
Person operates to avoid fuzzy all aspects of this disclosure.
Herein, " connection " is used to indicate the electrical or signal connection between two elements, module or equipment, the connection
Can be being directly connected between the two, be also possible between the two via between one or more intermediary elements or module in succession
It connects.
Fig. 1 shows the power-supply system with power supply switch circuit 100 according to an embodiment of the present disclosure.The power-supply system example
It such as can be the power-supply system of motor vehicles.Power-supply system has main power source 210, backup power source 220, ground connection GND and external use
Electric equipment 230.Main power source 210 for example can be motor vehicles by engine-driven generator.Backup power source 220 is for example
The battery or battery group that can be vehicle, be switched in the power failure of main power source the backup power source 220 with for
External electric equipment 230 provides electric power.External electric equipment 230 can be the electric apparatus mounted on vehicle of vehicle, such as controller
(ECU) etc..
Main power source 210, backup power source 220 and ground connection GND are connected as input to power supply switch circuit 100.Power supply switching
The output of circuit 100 is connected to external electric equipment 230.Power supply switch circuit 100 independently of power circuit 210 and 220, and
External electric equipment 230.That is, external electric equipment 230 does not need to be modified for power supply switching, power circuit
210 and 220 external equipment as power supply switch circuit 100, without for power supply switch circuit 100 be modified and
Match.Power supply switch circuit 100 can be set between any external electric equipment 230 and its electric power input 210 and 220.At this
In disclosed embodiment, the main power source 210 and backup power source 220 for being connected to power supply switch circuit 100 can also be to motor vehicles
Power-supply system other external electric equipments provide electric power.Power-supply system can be low voltage electric power system, power supply switch circuit
100 can be used for low-tension supply switching.
Fig. 2 then shows the exemplary structure of power supply switch circuit 100 according to an embodiment of the present disclosure.Power supply switch circuit
100 can have four main input and output terminals.Main power source input terminal 101 is used to receive the electric power of main power source 210, spare
Power input 102 is used to receive the electric power of backup power source 220, ground terminal GND for being grounded, power output end 103 be used for
230 output power of external electric equipment of power supply switch circuit 100.Power supply switch circuit 100 can also have modular connect
Mouth unit 160,101,102,103 and GND of terminal for example can be corresponding to outside via the corresponding interface on interface unit 160
Module is connected with equipment.
Main power source input terminal 101 is connected to capacitor C2 via capacitor C1 and diode D1.Capacitor C1 is for storing
Electric power and the voltage of power for stablizing main power source.When being switched to the electric power of backup power source from the electric power of main power source, the electricity of main power source
Power voltage declines, and capacitor C1 can slow down the decrease speed of voltage of power, so that defeated using the electric power of backup power source
It is arrived before the switching completion of power output end 103 out, the voltage of power output end 103 is unlikely to drop to external electric equipment
Below 230 rated operational voltage.Diode D1 one-way conduction, for preventing in the electric power for being switched to backup power source, electric current
Reverse flow enters main power source.
Backup power source input terminal 102 is connected to the power input end of switching switch 110.Switch the electric power output of switch 110
The cathode of end and diode D1 are parallel-connected to one end of capacitor C2.The other end of capacitor C2 is connected to power output end
103.The effect of capacitor C2 is to carry out electric power storage and voltage pressure stabilizing to the power input through switching, and avoids being cut in power supply
There is rapid decrease in output voltage during changing on power output end 103.In addition, capacitor C2 can also avoid power fluctuation
Lead to the damage of timer 130 and external electric equipment 230 etc..
Power supply switch circuit 100 further includes voltage detector 120 and timer 130.Voltage detector 120 is for detecting master
The voltage of the voltage of power of power supply, the main power source detected can be exported directly, or by itself and preset voltage threshold
It is compared with output voltage comparison result.The voltage or voltage comparison result of the main power source detected are respectively as timer
130 input and one of the control signal of controlled input end for switching switch 110.Voltage detector 120 is by power output end 103
Be driven by electricity.Because there is the electric power output for the normal work for meeting external electric equipment always in power output end 103, so
Voltage detector 120 can keep the lasting monitoring to the voltage of power of main power source.
Timer 130 is connect with voltage detector 120, the electricity of the main power source for being detected based on voltage detector 120
Pressure or voltage comparison result carry out timing to the power supply of backup power source, and are compared with preset timing threshold value with defeated
Timing comparison result or directly output timing out.Timing comparison result or the timing directly exported are as switching switch 110
Controlled input end another control signal.Timer 130 is driven by electricity by power output end 103.In timer 130 and electricity
Between power output end 103, low voltage difference pressure regulation (LDO) unit can be set, pressure stabilizing and decompression are carried out to meet timing to supply voltage
The demand of device 130.
Switch switch 110 respectively with main power source input terminal 101, backup power source input terminal 102, voltage detector 120 and count
When device 130 connect, for based on controlled input end control signal control power input end and power output end between conducting
With disconnection, at least one of electric power and electric power of backup power source 220 of main power source 210 is selected to be output to power output end 103
To be powered by least one of the electric power of main power source 210 and the electric power of backup power source 220.Switching switch 110 for example may be used
In the form of using controlled switch such as transistors.In embodiment of the disclosure, switching switch is illustrated by taking MOSFET as an example
110 working method.It will be understood by those skilled in the art that the range of switching switch 110 is without being limited thereto.The source electrode of MOSFET 110
Backup power source input terminal 102, drain electrode connection capacitor C2 are connected, grid is separately connected the output end and meter of voltage detector 120
When device 130 output end.In accordance with an embodiment of the present disclosure, since MOSFET itself has the function of preventing electric current reversed,
Switching switch 110 can avoid the electric power of main power source to spare when the power input end of switch 110 is connected with power output end
Power source charges, main power source and backup power source are connected to capacitor C2 simultaneously with to 103 output power of power output end at this time.
In accordance with an embodiment of the present disclosure, logical value 1 (true, to indicate with high level) and 0 (vacation, with low level table can be used
Show) indicate the voltage comparison result of voltage detector 120 and the timing comparison result of timer 130.For example, testing result 1
Indicate the voltage of power of main power source lower than meeting to the voltage threshold of external electric equipment normal power supply or be restored to not yet energy
Enough that electric power is switched back into the electric power of main power source from backup power source to carry out the voltage of normal power supply, 0 indicates the electric power of main power source
Voltage be sufficient for external electric equipment normal power supply or be restored to enough by electric power from backup power source switch back into main power source with
Carry out the voltage of normal power supply.The timing comparison result 1 of timer 130 indicates that the power supply time of backup power source is more than preparatory
The timing threshold value of setting, 0 indicates that the power supply time of backup power source is not above preset timing threshold value.Timer
130 start timing when the voltage comparison result output of voltage detector 120 is 1, stop timing when testing result output is 0
And it is zeroed, that is to say, that timer 130 starts to count when the voltage of main power source drops below the voltage threshold of normal power supply
When, timing is reset when the voltage of main power source rises at least above voltage threshold of normal power supply.
Switch switch 110 then when the control signal that controlled input end receives is 1, the electric power input of conducting switch 110
Hold the current path between power output end, by the electric power of backup power source 220 access capacitor C2 with to power output end 103
Output power.That is, switching switch 110 declines in the voltage of main power source when the electric power by main power source 210 is powered
Selection is powered by the electric power of backup power source 220 when to the voltage threshold for being lower than normal power supply.When controlling signal is 0, cut
The current path between the disconnection power input end of switch 110 and power output end is changed, reselects the electric power of main power source as electricity
The output power of power output end 103.That is, switching switch 110 exists when the electric power by backup power source 220 is powered
The voltage of main power source rises at least above voltage threshold of normal power supply or timing is greater than in preset timing threshold value
Any one condition when meeting, selection is powered by the electric power of main power source 210.If voltage detector 120 directly exports
The voltage of main power source can be compared defeated by the voltage of the main power source detected by simple logic circuit with voltage threshold
Out.If timer 130 directly exports timing, timing can also be compared with timing threshold value by simple logic circuit
Output.Switching switch is output to after can carrying out logic "and" operation to the output of both voltage detector 120 and timer 130
110 controlled input end.In accordance with an embodiment of the present disclosure, by the timing of the voltage and timer of the main power source detected,
The handoff procedure between main power source and backup power source can be realized based on the combination of multiple power sources switching condition.
According to one embodiment, output filter 150 can be set between capacitor C2 and power output end 103, used
It is generated in handoff procedure in electric power input, the electric power input of backup power source and the power supply switch circuit 100 of filtering main power source
Voltage fluctuation, and for electromagnetic interference EMI to be isolated.
Illustrate the handoff procedure of power supply switch circuit 100 according to an embodiment of the present disclosure presently in connection with Fig. 3 and Fig. 4.
Under normal circumstances, the voltage of power from main power source 210 is maintained at 230 steady operation of external electric equipment
Level.For example, the rated operational voltage of external electric equipment 230 is 6V, the then electric power of the power switching arrangement 100 in Fig. 3
The voltage of output end 103 should be maintained at 6V or more.Voltage detector 120 persistently detects the main power source of main power source input terminal 101
Voltage.It, can be by first voltage threshold value in view of from main power source input terminal 101 to the voltage drop power output end 103
It is set as 8V.Since the voltage of power of main power source is continuously maintained in first voltage threshold value or more, then the output of voltage detector 120
For " 0 ", indicate that the electric power of main power source is normal.Timer 130 is when input is " 0 " without timing.Switching switch 110 is controlling
The current path between power input end and power output end is disconnected when signal is " 0 ", will be received from backup power source input terminal 102
Backup power source electric power and capacitor C2 disconnect, only select the electric power of main power source to 103 output power of power output end.This
When, the electric current flowing in power supply switch circuit 100 as shown in the path A1 in Fig. 3, the electric current from main power source through capacitor C1,
Diode D1, capacitor C2 and output filter 150 are output to power output end 103, and to voltage detector 120 power with
It can continue the voltage of detection main power source.
When voltage detector 120 detects the voltage of main power source lower than first voltage threshold value, the electric power of main power source is judged
It breaks down, has been not enough to provide the stable power-supplying voltage of 6V to external electric equipment 230.At this point, voltage detector 120
As the testing result of output " 1 " to indicate the voltage of main power source lower than first voltage threshold value needs to be switched to the electricity of backup power source
Power.Output " 1 " of the timer 130 based on voltage detector 120 starts timing, switches switch 110 based on voltage detector 120
The current path between its power input end and power output end is connected in output " 1 ", selects the electric power from backup power source 220 defeated
Power output end 103 is arrived out.The capacitance of capacitor C1 and C2 based on judge main power source electric power whether Yi Chang first voltage
Threshold value and the switching time setting for switching switch 110 come from main power source input terminal to guarantee before handoff procedure is completed
101 voltage of power will not rapid decrease cause power output end 103 output voltage be lower than external electric equipment 230 work
Voltage, such as 6V.
Although the electric power of received main power source 210 is not interrupted from power supply switch circuit 100 on main power source input terminal 101
It opens, but the electric current from main power source 210 can be ignored.Therefore power supply switch circuit 100 selects the electricity of backup power source 220
Power is output to power output end 103, and simultaneously to voltage detector 120 and timer 130 (via LDO unit) power supply to guarantee
The normal operation of the two.At this point, the electric current of the backup power source in power supply switch circuit 100 flows through switching switch 110, capacitor C2
It is output to power output end 103 with output filter 150, shown in the path A2 in such as Fig. 4.In accordance with an embodiment of the present disclosure,
Auxiliary standby power supply is generally used as using the reserve battery (group) of 12V in motor vehicles.The electric power of backup power source can pass through voltage
(boost or depressurization) electric power of offer for powering to external electric equipment 230 on power output end 103 is provided.
When the voltage of power of main power source is restored to the stable power-supplying voltage of 6V can be provided to external electric equipment 230 again
When, judge that the electric power of main power source is recovered.For the circuit system of motor vehicles, the electric power input of main power source is come spontaneous
The generator of motivation driving, therefore there is fluctuation in the voltage of power of main power source, the usual fluctuation is within the scope of 1V.It will be used for
The second voltage threshold value for judging whether the electric power of main power source restores is set as such as 9V, and it is enough which is higher than first voltage threshold value
The case where more amounts to guarantee is not in frequent switching.Voltage detector 120 is more than the in the voltage of the main power source detected
When two voltage thresholds (such as 9V), the testing result of " 0 " is exported.Timer 130, which is based on input " 0 ", to be stopped timing and is zeroed (i.e.
Reset timing), while exporting the timing result of " 0 ".Switching switch 110 be based on control signal " 0 " disconnect its power input end with
Current path between power output end disconnects the electric power of backup power source, and the electric power for reselecting main power source is exported to electric power
103 output of end.Received control signal " 0 " of switching switch 110 can come from the output of voltage detector 120, can be from
The output of timer 130 can be from the result of the logic and operation of the two output.Equally, complete in handoff procedure
At before, capacitor C2 is used for the output voltage by energy storage stable power output end 103 to meet to external electric equipment 230
Power supply.The current flow path of power supply switch circuit 100 comes back to path A1 shown in Fig. 3.
It is true by the timing of timer 130 if the voltage of power of main power source cannot be restored to always normal voltage
It is fixed whether to carry out power supply switching.Timing threshold value is set so that whether the electricity for judging backup power source exhausts.Timing threshold value can be set
Be set to not less than external electric equipment 230 can in time to power failure (especially mains power failure) reply operation (such as
Upload report, back up etc.) time for making a response, the usual time is 10 minutes or so.Timing threshold value should also be as being lower than
The electricity of backup power source exhausts the time, damages to avoid backup power source over-discharge.
When the timing time of timer 130 be more than timing threshold value when, timer 130 export " 0 " timing (comparison) as a result,
Indicate that the electricity of backup power source will exhaust.Switching switch 110 disconnects its electricity based on the control signal " 0 " from timer 130
Current path between power input terminal and power output end disconnects the electric power from backup power source, switches back into main power source again
Electric power.
Therefore, switching switch 110 is " 1 " (output of timer 130 is also 1 at this time) in the output of voltage detector 120,
I.e. the power failure of main power source when, the electric power of main power source is switched to the electric power of backup power source；In voltage detector 120 and timing
It, i.e., will when the power recovery of main power source or timing are more than time threshold when at least one of output of both devices 130 is " 0 "
The electric power of backup power source switches back into the electric power of main power source.
Fig. 5 shows the flow chart of the power-supply switching method according to the disclosure.
Power supply switch circuit 100 connects the electric power input of main power source and backup power source first.
In the step S410 of the electric power normal condition of main power source, switching switch selects the electric power of main power source as electricity first
Power output, switching switch is in an off state at this time.
Then, in the step s 420, the voltage of voltage detector detection main power source.If detecting master in step S430
The voltage of power supply is lower than first voltage threshold value, then process proceeds to step S440, switches switch conduction to select backup power source
Electric power is exported as electric power.
If detecting the voltage of power of main power source in step S430 not less than first voltage threshold value, process returns to step
Rapid S420, switching switch, which is disconnected still to select the electric power of main power source to export as electric power and continue, detects its voltage.
After step S440, timer starts timing in step S450.It should be noted that voltage detector is still at this time
Persistently detect the voltage of main power source.
It is more than first when the voltage of main power source is higher than the timing of second voltage threshold value or timer in step S460
Time threshold, that is, when meeting any one of two conditions, process returns to S410, disconnects switching switch with by backup power source
Electric power switch back into the electric power of main power source.If two conditions in step S460 are all unsatisfactory for, process return step S440,
Switching switch conduction is still maintained to select the electric power of backup power source to external power supply for electrical equipment, timer continues timing, electricity
Pressure detector persistently detects the voltage of main power source.
Pass through the power supply switch circuit and switching method being outlined above, it is ensured that external electric equipment has stable electricity
Source input and voltage, electric current during power supply switching are stablized.It, can be from standby electricity when the power recovery of main power source
Source switches back into main power source power supply.Compared to the mode that the voltage to main power source and backup power source is detected, using the electricity of main power source
The double condition of pressure detection and timing controls, and can prevent the dead battery capability of backup power source, and to external electric equipment
(such as ECU of vehicle) provides the enough reaction time to guarantee to complete emergency operation.Be arranged different first voltage threshold value and
Second voltage threshold value, can be to avoid the frequent switching between main power source and the electric power of backup power source.In embodiment of the disclosure,
Using only basic circuit elements and general voltage detector component, timer element, simple circuit element can be used more
Power supply switching is carried out in the case where kind of power input, without control chip and structural control device, at lower cost and electric power
The function of power supply switching is completed in the case where consumption.The structure of this simple power supply switch circuit also has low-power consumption
Advantage, such as the running current of 100uA is only needed to consume.
This power supply switch circuit and switching method can be applied in the circuit system of motor vehicles, and preferably effect is obtained
Fruit.
Those skilled in the art will readily occur to its of the disclosure after considering specification and practicing this disclosure
Its embodiment.This application is intended to cover any variations, uses, or adaptations of the disclosure, these modifications, purposes or
Person's adaptive change follows the general principles of this disclosure and including the undocumented common knowledge in the art of the disclosure
Or conventional techniques.The description and examples are only to be considered as illustrative, and the true scope and spirit of the disclosure are by appended
Claim is pointed out.
Claims (10)
1. a kind of power supply switch circuit (100), characterized by comprising:
Main power source input terminal (101) is arranged to receive the electric power of main power source (210)；
Backup power source input terminal (102) is arranged to receive the electric power of backup power source (220)；
Power output end (103), is arranged to output power；
Voltage detector (120) is arranged to detect the voltage of main power source (210)；
Timer (130) is connect with the voltage detector (120), and is arranged to based on the voltage detector (120)
The voltage of the main power source (210) detected carries out timing；
Switching switch (110) is examined with the main power source input terminal (101), the backup power source input terminal (102), the voltage
Device (120) and the timer (130) connection are surveyed, and are arranged to the institute detected based on the voltage detector (120)
The timing of the voltage and the timer (130) of main power source (210) is stated to select the electric power of the main power source (210) and described standby
The power output end (103) is output to by the electricity of the main power source (210) at least one of the electric power of power supply (220)
At least one of the electric power of power and the backup power source (220) is powered.
2. power supply switch circuit (100) as described in claim 1, it is characterised in that:
The timer (130) is arranged to open when the voltage of the main power source (210) drops below first threshold voltage
Beginning timing；And
The switching switch (110) is arranged to be powered and the main power source when by the electric power of the main power source (210)
(210) when voltage drops below the first threshold voltage, the electric power of the backup power source (220) is output to the electricity
Power output end (103) is powered with the electric power by the backup power source (220).
3. power supply switch circuit (100) as claimed in claim 2, it is characterised in that:
The timer (130) is arranged to the weight when the voltage of the main power source (210) rises above second threshold voltage
Timing is set, wherein the second threshold voltage is higher than the first threshold voltage；And
The switching switch (110), which is arranged to work as, to be powered and is met following by the electric power of the backup power source (220)
When any one of situation, the electric power of the main power source (210) is output to the power output end (103) by the master
The electric power of power supply (210) is powered:
The voltage of the main power source (210) rises above the second threshold voltage；
The timing is greater than predetermined timing threshold value.
4. power supply switch circuit (100) as claimed in claim 3, which is characterized in that the power supply switch circuit (100) is also wrapped
It includes interface unit (160), the main power source input terminal (101), the backup power source input terminal (102) and the power output end
(103) main power source (210), the backup power source (220) and external electricity consumption are separately connected via the interface unit (160)
Equipment (230).
5. power supply switch circuit (100) as claimed in claim 3, which is characterized in that backup power source input terminal (102) warp
The power output end (103) are parallel-connected to by switching switch (110) and the main power source input terminal (101), wherein
The switching switch (110) is MOSFET.
6. the power supply switch circuit (100) as described in any one of claims 1 to 5, which is characterized in that the voltage detector
(120) and in the timer at least one of (130) passes through the power supply of the power output end (103).
7. a kind of motor vehicles, it is characterised in that including power supply switch circuit such as described in any one of claims 1 to 6
(100)。
8. a kind of power-supply switching method, characterized by comprising:
Detect the voltage of main power source；
Voltage based on the main power source detected carries out timing；
It is selected based on the voltage of the main power source detected and the timing by the main power source and backup power source
At least one is powered.
9. method according to claim 8, which is characterized in that when being powered by the main power source and the main power source
When voltage drops below first threshold voltage, selection is powered by the backup power source.
10. method as described in any of claims 8 or 9, which is characterized in that rise to height in the voltage of the main power source
Timing is reset when second threshold voltage, wherein the second threshold voltage is higher than the first threshold voltage；And
When any one of being powered by the backup power source and being met following situations, selection by the main power source into
Row power supply:
The voltage of the main power source rises above the second threshold voltage；
The timing is greater than predetermined timing threshold value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910529965.2A CN110266100A (en) | 2019-06-19 | 2019-06-19 | Power supply switch circuit and power-supply switching method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910529965.2A CN110266100A (en) | 2019-06-19 | 2019-06-19 | Power supply switch circuit and power-supply switching method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110266100A true CN110266100A (en) | 2019-09-20 |
Family
ID=67919273
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910529965.2A Pending CN110266100A (en) | 2019-06-19 | 2019-06-19 | Power supply switch circuit and power-supply switching method |
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| Country | Link |
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| CN (1) | CN110266100A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110733349A (en) * | 2019-11-04 | 2020-01-31 | 宝能(广州)汽车研究院有限公司 | Electric automobile power supply switching system and electric automobile |
| CN111009958A (en) * | 2019-12-13 | 2020-04-14 | 漳州科华技术有限责任公司 | Power supply control circuit |
| CN112332513A (en) * | 2020-10-12 | 2021-02-05 | 合肥联宝信息技术有限公司 | Electronic equipment and power control method thereof |
| CN113888856A (en) * | 2021-09-30 | 2022-01-04 | 江苏久智环境科技服务有限公司 | Monitoring system for providing operation for sprinkler based on road traffic fault judgment model |
-
2019
- 2019-06-19 CN CN201910529965.2A patent/CN110266100A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110733349A (en) * | 2019-11-04 | 2020-01-31 | 宝能(广州)汽车研究院有限公司 | Electric automobile power supply switching system and electric automobile |
| CN111009958A (en) * | 2019-12-13 | 2020-04-14 | 漳州科华技术有限责任公司 | Power supply control circuit |
| CN112332513A (en) * | 2020-10-12 | 2021-02-05 | 合肥联宝信息技术有限公司 | Electronic equipment and power control method thereof |
| CN112332513B (en) * | 2020-10-12 | 2022-03-29 | 合肥联宝信息技术有限公司 | Electronic equipment and power control method thereof |
| CN113888856A (en) * | 2021-09-30 | 2022-01-04 | 江苏久智环境科技服务有限公司 | Monitoring system for providing operation for sprinkler based on road traffic fault judgment model |
| CN113888856B (en) * | 2021-09-30 | 2023-01-10 | 江苏久智环境科技服务有限公司 | Monitoring system for providing operation for sprinkler based on road traffic fault judgment model |
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Application publication date: 20190920 |