CN107069937A - Automatic change-over device of emergency - Google Patents
Automatic change-over device of emergency Download PDFInfo
- Publication number
- CN107069937A CN107069937A CN201710277353.XA CN201710277353A CN107069937A CN 107069937 A CN107069937 A CN 107069937A CN 201710277353 A CN201710277353 A CN 201710277353A CN 107069937 A CN107069937 A CN 107069937A
- Authority
- CN
- China
- Prior art keywords
- resistance
- power supply
- voltage
- pmos
- main power
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- 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
-
- 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
-
- 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
Automatic change-over device of emergency, is related to power supply switching field.Although the present invention is can to accomplish to automatically switch to lithium battery power supply to solve existing switching circuit, the threshold value of switching can not be set, and the situation problem for alternately and repeatedly switching power supply occurs.During device power-up when main power voltage is higher than 17V, voltage comparator KU1 exports high level, drive triode KT2 conductings, PMOS KT1 conductings are driven, VIN is powered by main power source, the Ub=2.48V when main power voltage drops to 17V, voltage comparator KU1 exports low level, triode KT2 ends, and PMOS KT1 cut-offs, VIN is continued to power by lithium battery BT1；When main power voltage is increased to 18.2V, LM2903D output high level driving triode KT2 conductings, driving PMOS conducting, VIN is powered by main power source.It switches for power supply.
Description
Technical field
The present invention relates to automatic change-over device of emergency.Belong to power supply switching field.
Background technology
At present frequently with dual-power automatic switching circuit as point, close load current, overload current, short circuit current flow and be used,
Automatically switched in automobile industry using dual-power automatic switching circuit realiration double loop power supply, it is ensured that the real-time power supply of important load,
Dual-power automatic switching circuit, is the perfect switch equipment for realizing power automation.
Fig. 1 gives application diode switching circuit relatively conventional at present；Fig. 2 gives application relatively conventional at present
PMOS and diode switching circuit；
The operation principle of Fig. 1 application diode switching circuit is：
Lithium battery power supply is automatically switched into when V+24 is powered off.Have the disadvantage when V+24 voltage drops to below 8.4V but do not had
(i.e. V+24 when dropping to 0V<VBT), lithium battery power supply can be also switched to, and situation about alternately and repeatedly switching occurs.
Fig. 2 application PMOS and the operation principle of diode switching circuit are：
Lithium battery power supply is automatically switched to after battery is powered off.The shortcoming of circuit only with diode is improved, still
Situation about alternately and repeatedly switching also occurs in this circuit.
However, the defect of switching circuit is in the prior art：Although existing switching circuit can accomplish to automatically switch
To lithium battery power supply, but the threshold value of switching can not be set, and the situation for alternately and repeatedly switching power supply occurs.
The content of the invention
Although the present invention is can to accomplish to automatically switch to lithium battery power supply to solve existing switching circuit, not
Can the threshold value of switching be set, and the situation problem for alternately and repeatedly switching power supply occurs.Now provide stand-by power supply automatic
Switching device.
Automatic change-over device of emergency, it includes main power source, stand-by power supply BT1 and switching circuit；
The switching circuit includes resistance R1-R10, counnter attack diode RD1, voltage-stabiliser tube RD2, PMOS KT1, triode
KT2, electric capacity C1, voltage comparator KU1 and reference voltage；
The positive that resistance R5 one end connects resistance R8 one end, resistance R2 one end and voltage comparator KU1 simultaneously is defeated
Enter to hold, resistance R8 other end connection power supply,
The resistance R5 other end connects the positive pole of main power source,
Voltage comparator KU1 inverting input connects resistance R9 one end and resistance R7 one end simultaneously, resistance R7's
The positive pole of other end connection reference voltage, resistance R9 other end connection power supply, voltage comparator KU1 two-phase positive source
The positive pole of connection reference voltage, voltage comparator KU1 two-phase power cathode connection power supply,
Voltage comparator KU1 output end connects the one of the resistance R2 other end, resistance R4 one end and resistance R6 simultaneously
End, the resistance R4 other end connects the positive pole of main power source,
The resistance R6 other end connects voltage-stabiliser tube RD2 negative pole, resistance R10 one end and triode KT2 base stage simultaneously,
Voltage-stabiliser tube RD2 positive pole and the resistance R10 other end with being all connected with power supply, triode KT2 emitter stage connection power supply,
Triode KT2 colelctor electrode connection resistance R3 one end, the resistance R3 other end connects resistance R1 one end simultaneously
With PMOS KT1 grid, PMOS KT1 source electrode connects the resistance R1 other end and the positive pole of main power source, PMOS simultaneously
KT1 drain electrode connects electric capacity C1 one end and counnter attack diode RD1 negative pole simultaneously, PMOS KT1 drain electrode connection equipment
Power supply input,
Counnter attack diode RD1 positive pole connection stand-by power supply BT1 positive pole, stand-by power supply BT1 negative pole connection power supply.
Beneficial effects of the present invention：
In real work, the resistance R5 other end connects the positive pole of main power source, and main power source is realized using battery, Fig. 1
In main power source V+24 represent that battery tension nominal value is 24V；
Power supply the input VIN, VIN of PMOS KT1 drain electrode connection equipment are that the power supply of subsequent conditioning circuit (is set
Standby power supply)；
Stand-by power supply BT1 in Fig. 3 uses standby lithium pond 8.4V (can be charged by charging circuit)；
(reference voltage is the output by main power source or stand-by power supply BT1 through turning to reference voltage use+5V power supplys in Fig. 3
+ 5V the power supplys obtained after changing)；
The principle of circuit is in Fig. 3：The tie point of resistance R9 one end and resistance R7 one end is Ua, and resistance R5's is another
The tie point of end and resistance R2 one end is Ub,
Resistance R7 and resistance R9 is by the voltage of reference voltage, as voltage comparator KU1 input reference voltage.Electricity
R5 and resistance R8 is hindered by battery BT1 voltages, input comparison voltages of the Ub as voltage comparator.
During device power-up when main power voltage is higher than 17V, voltage comparator KU1 output high level, driving triode KT2
Conducting, driving PMOS KT1 conductings, VIN is powered by main power source.Counnter attack diode RD1 can prevent VIN now to standby electricity
Source applies backward voltage.
Ub=2.48V when main power voltage drops to 17V.Voltage comparator KU1 exports low level, triode
KT2 ends, PMOS KT1 cut-offs.VIN is continued to power by lithium battery BT1.
When main power voltage is increased to 18.2V, Ub=2.52V, LM2903D output high level, driving triode KT2 is led
Logical, driving PMOS conducting, VIN is powered by main power source.
Power supply is set to switch by adjusting the resistance of divider resistance using the stand-by power supply automatic switching circuit of the application
Threshold value, eliminate the problem of two power supplys alternately and repeatedly switch, make power supply more stable.
Brief description of the drawings
Fig. 1 is diode switching circuit relatively conventional at present；
Fig. 2 is relatively conventional at present PMOS and diode switching circuit；
Fig. 3 is the circuit diagram of the automatic change-over device of emergency described in embodiment one.
Embodiment
Embodiment one：Reference picture 1 illustrates present embodiment, and the stand-by power supply described in present embodiment is automatic
Switching circuit, it includes main power source, stand-by power supply BT1 and switching circuit；
The switching circuit includes resistance R1-R10, counnter attack diode RD1, voltage-stabiliser tube RD2, PMOS KT1, triode
KT2, electric capacity C1, voltage comparator KU1 and reference voltage；
The positive that resistance R5 one end connects resistance R8 one end, resistance R2 one end and voltage comparator KU1 simultaneously is defeated
Enter to hold, resistance R8 other end connection power supply,
The resistance R5 other end connects the positive pole of main power source,
Voltage comparator KU1 inverting input connects resistance R9 one end and resistance R7 one end simultaneously, resistance R7's
The positive pole of other end connection reference voltage, resistance R9 other end connection power supply, voltage comparator KU1 two-phase positive source
The positive pole of connection reference voltage, voltage comparator KU1 two-phase power cathode connection power supply,
Voltage comparator KU1 output end connects the one of the resistance R2 other end, resistance R4 one end and resistance R6 simultaneously
End, the resistance R4 other end connects the positive pole of main power source,
The resistance R6 other end connects voltage-stabiliser tube RD2 negative pole, resistance R10 one end and triode KT2 base stage simultaneously,
Voltage-stabiliser tube RD2 positive pole and the resistance R10 other end with being all connected with power supply, triode KT2 emitter stage connection power supply,
Triode KT2 colelctor electrode connection resistance R3 one end, the resistance R3 other end connects resistance R1 one end simultaneously
With PMOS KT1 grid, PMOS KT1 source electrode connects the resistance R1 other end and the positive pole of main power source, PMOS simultaneously
KT1 drain electrode connects electric capacity C1 one end and counnter attack diode RD1 negative pole simultaneously, PMOS KT1 drain electrode connection equipment
Power supply input,
Counnter attack diode RD1 positive pole connection stand-by power supply BT1 positive pole, stand-by power supply BT1 negative pole connection power supply.
Embodiment：
Main power source realizes that battery tension nominal value is 24V using battery, and remarks power supply BT1 is realized using lithium battery,
Reference voltage use+5V power supplys,
Resistance R7 and resistance R9 is by the voltage of+5V power supplys, Ua=2.5V, as voltage comparator KU1 input base
Quasi- voltage.Resistance R5 and resistance R8 is by battery BT1 voltages, input comparison voltages of the Ub as voltage comparator.
During device power-up when battery tension is higher than 17V, voltage comparator KU1 output high level, driving triode KT2
Conducting, the KT1 conductings of driving PMOS, VIN is by storage battery power supply.Counnter attack diode RD1 can prevent VIN now to lithium battery
Apply backward voltage.
Ub=2.48V when battery tension drops to 17V.Voltage comparator KU1 exports low level, triode
KT2 ends, PMOS KT1 cut-offs.VIN is continued to power by lithium battery BT1.
When battery tension is increased to 18.2V, Ub=2.52V, LM2903D output high level, driving triode KT2 is led
It is logical, driving PMOS conducting, VIN is by storage battery power supply.
Embodiment two：Present embodiment is to the stand-by power supply automatic switching circuit described in embodiment one
It is described further, in present embodiment, stand-by power supply BT1 supply voltage is 8.4V.
Embodiment three：Present embodiment is to the stand-by power supply automatic switching circuit described in embodiment one
It is described further, in present embodiment, reference voltage is the converted rear acquisition of output by main power source or stand-by power supply BT1
+ 5V power supplys.
In present embodiment, the power supply of equipment can obtain working power by conversion, and the working power can be made
On the basis of voltage.
Embodiment four：Present embodiment is to the stand-by power supply automatic switching circuit described in embodiment one
It is described further, in present embodiment, during device power-up, when the cathode voltage of main power source is higher than 17V, voltage comparator
KU1 exports high level；When the cathode voltage of main power source drops to 17V, voltage comparator KU1 output low levels.
Embodiment five：Present embodiment is to the stand-by power supply automatic switching circuit described in embodiment one
It is described further, in present embodiment, voltage comparator KU1 is realized using model LM2903D.
Claims (5)
1. automatic change-over device of emergency, it is characterised in that it includes main power source, stand-by power supply BT1 and switching circuit；
The switching circuit include resistance R1-R10, counnter attack diode RD1, voltage-stabiliser tube RD2, PMOS KT1, triode KT2,
Electric capacity C1, voltage comparator KU1 and reference voltage；
Resistance R5 one end connects the normal phase input end of resistance R8 one end, resistance R2 one end and voltage comparator KU1 simultaneously,
Resistance R8 other end connection power supply,
The resistance R5 other end connects the positive pole of main power source,
Voltage comparator KU1 inverting input connects resistance R9 one end and resistance R7 one end simultaneously, and resistance R7's is another
The positive pole of end connection reference voltage, resistance R9 other end connection power supply, voltage comparator KU1 two-phase positive source connection
The positive pole of reference voltage, voltage comparator KU1 two-phase power cathode connection power supply,
Voltage comparator KU1 output end connects the resistance R2 other end, resistance R4 one end and resistance R6 one end, electricity simultaneously
The other end for hindering R4 connects the positive pole of main power source,
The resistance R6 other end connects voltage-stabiliser tube RD2 negative pole, resistance R10 one end and triode KT2 base stage, voltage stabilizing simultaneously
Pipe RD2 positive pole and the resistance R10 other end with being all connected with power supply, triode KT2 emitter stage connection power supply,
Triode KT2 colelctor electrode connection resistance R3 one end, the resistance R3 other end connect simultaneously resistance R1 one end and
PMOS KT1 grid, PMOS KT1 source electrode connects the resistance R1 other end and the positive pole of main power source, PMOS KT1 simultaneously
Drain electrode connect electric capacity C1 one end and counnter attack diode RD1 negative pole, the power supply of PMOS KT1 drain electrode connection equipment simultaneously
Power input,
Counnter attack diode RD1 positive pole connection stand-by power supply BT1 positive pole, stand-by power supply BT1 negative pole connection power supply.
2. automatic change-over device of emergency according to claim 1, it is characterised in that stand-by power supply BT1 power supply electricity
Press as 8.4V.
3. automatic change-over device of emergency according to claim 1, it is characterised in that reference voltage be by main power source or
+ 5V the power supplys obtained after stand-by power supply BT1 output is converted.
4. automatic change-over device of emergency according to claim 1, it is characterised in that during device power-up, works as main power source
Cathode voltage be higher than 17V when, voltage comparator KU1 output high level；When the cathode voltage of main power source drops to 17V, electricity
Press comparator KU1 output low levels.
5. automatic change-over device of emergency according to claim 1, it is characterised in that voltage comparator KU1 uses type
Number LM2903D is realized.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710277353.XA CN107069937A (en) | 2017-04-25 | 2017-04-25 | Automatic change-over device of emergency |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710277353.XA CN107069937A (en) | 2017-04-25 | 2017-04-25 | Automatic change-over device of emergency |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107069937A true CN107069937A (en) | 2017-08-18 |
Family
ID=59603800
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710277353.XA Withdrawn CN107069937A (en) | 2017-04-25 | 2017-04-25 | Automatic change-over device of emergency |
Country Status (1)
| Country | Link |
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| CN (1) | CN107069937A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107834692A (en) * | 2017-10-26 | 2018-03-23 | 深圳市凌康技术股份有限公司 | A kind of battery automatically engages circuit |
| CN108565957A (en) * | 2018-02-01 | 2018-09-21 | 上海移为通信技术股份有限公司 | A kind of power supply seamless switch-over system and method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101136558A (en) * | 2006-09-02 | 2008-03-05 | 深圳迈瑞生物医疗电子股份有限公司 | Power supply system and switch circuit, switch method of main power source and backup battery |
| CN102593946A (en) * | 2012-02-21 | 2012-07-18 | 德讯科技股份有限公司 | Dual-power-supply automatic switching circuit based on power MOSFET application |
| CN105743066A (en) * | 2016-03-24 | 2016-07-06 | 航天科技控股集团股份有限公司 | Actively-disconnected vehicle-mounted storage battery protection circuit |
| CN206640392U (en) * | 2017-04-25 | 2017-11-14 | 航天科技控股集团股份有限公司 | Automatic change-over device of emergency |
-
2017
- 2017-04-25 CN CN201710277353.XA patent/CN107069937A/en not_active Withdrawn
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101136558A (en) * | 2006-09-02 | 2008-03-05 | 深圳迈瑞生物医疗电子股份有限公司 | Power supply system and switch circuit, switch method of main power source and backup battery |
| CN102593946A (en) * | 2012-02-21 | 2012-07-18 | 德讯科技股份有限公司 | Dual-power-supply automatic switching circuit based on power MOSFET application |
| CN105743066A (en) * | 2016-03-24 | 2016-07-06 | 航天科技控股集团股份有限公司 | Actively-disconnected vehicle-mounted storage battery protection circuit |
| CN206640392U (en) * | 2017-04-25 | 2017-11-14 | 航天科技控股集团股份有限公司 | Automatic change-over device of emergency |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107834692A (en) * | 2017-10-26 | 2018-03-23 | 深圳市凌康技术股份有限公司 | A kind of battery automatically engages circuit |
| CN108565957A (en) * | 2018-02-01 | 2018-09-21 | 上海移为通信技术股份有限公司 | A kind of power supply seamless switch-over system and method |
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| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WW01 | Invention patent application withdrawn after publication | ||
| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20170818 |