CN107516936A - A kind of direct current main secondary power switching circuit - Google Patents
A kind of direct current main secondary power switching circuit Download PDFInfo
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- CN107516936A CN107516936A CN201710802934.0A CN201710802934A CN107516936A CN 107516936 A CN107516936 A CN 107516936A CN 201710802934 A CN201710802934 A CN 201710802934A CN 107516936 A CN107516936 A CN 107516936A
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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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- 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
- H02J9/068—Electronic means for switching from one power supply to another power supply, e.g. to avoid parallel connection
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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
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- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Electronic Switches (AREA)
Abstract
A kind of direct current main secondary power switching circuit, including main power switch circuit and Backup Power Switch circuit；The main power switch circuit and the Backup Power Switch circuit input positive pole V1+ with main power source respectively and stand-by power supply input positive pole V2+ is electrically connected, and the main power switch circuit and the Backup Power Switch circuit electrically connect with power supply switching dead band delay circuit respectively；The input of power supply handover trigger circuit electrically connects with main power source input positive pole, and output end electrically connects with the main power switch circuit and the Backup Power Switch circuit respectively.The beneficial effect of the application is：Dead band delay function can not only realize seamless main power supply switching, additionally it is possible to load is protected, increased the service life；Using MOSFET as switch element, its small volume, conducting resistance are small, power attenuation is low, beneficial to the integrated and energy-conservation of circuit；It can be widely applied to need in the medicine equipment of uninterrupted power supply, industrial equipment.
Description
Technical field
The application belongs to power supply technical field, specifically, is related to a kind of direct current main secondary power switching circuit.
Background technology
In electric field, especially equipment running process, often because it is various artificial or non-artificial the reason for need
Interrupt power supply.But if the equipment being currently running is interrupted power supply and is likely to result in than more serious loss.This just needs to match somebody with somebody to equipment
Standby standby power supply, and when interrupting main power source progress main power supply switching.In general power supply switching be using relay,
The devices such as contactor realize that the volume of this switching mode switching device is big, switch speed is slow, the power supply of some special circumstances
Switching, this method are also possible to realize.This just needs to research and develop a kind of new handoff technique, come meet such as seamless switching,
Small volume, using it is wide the features such as.
The content of the invention
In view of this, technical problems to be solved in this application there is provided a kind of direct current main secondary power switching circuit, no
It is small only to switch equipment volume, additionally it is possible to meet the requirement of seamless switching.
In order to solve the above-mentioned technical problem, this application discloses a kind of direct current main secondary power switching circuit, and using following
Technical scheme is realized.
A kind of direct current main secondary power switching circuit, including the switching of main power switch circuit, Backup Power Switch circuit, power supply
Triggers circuit and power supply switching dead band delay circuit；The main power switch circuit and the Backup Power Switch circuit respectively with
Main power source inputs positive pole V1+ and stand-by power supply input positive pole V2+ electrical connections, and the main power switch circuit and the standby electricity
Source switching circuit electrically connects with power supply switching dead band delay circuit respectively；The input of the power supply handover trigger circuit with
Main power source input positive pole electrical connection, output end respectively with the main power switch circuit and the Backup Power Switch circuit
Electrical connection.
Further, the main power switch circuit includes metal-oxide-semiconductor Q1 and metal-oxide-semiconductor Q2；The main power source input positive pole V1+
Electrically connected with the S poles of the metal-oxide-semiconductor Q1, the G poles after the main power source input positive pole V1+ series resistances R1 with the metal-oxide-semiconductor Q1
Electrical connection；Electrically connected after the G poles series resistance R5 of the metal-oxide-semiconductor Q1 with triode Q5 colelctor electrode；The D poles of the metal-oxide-semiconductor Q1
Electrically connected with the D poles of the metal-oxide-semiconductor Q2；Colelctor electrode after the G poles series resistance R6 of the metal-oxide-semiconductor Q2 with triode Q6 is electrically connected
Connect；The triode Q5 and the triode Q6 base stage electrically connect with main power switch control signal SW_DC, three pole
Pipe Q5 and the triode Q6 emitter stage electrically connect with GND；The main power switch control signal SW_DC connections pull-up electricity
Electrically connected after resistance R11 with D/C power；Resistance R2 is connected between the S poles and G poles of the metal-oxide-semiconductor Q2；The S of the metal-oxide-semiconductor Q2 is extremely defeated
Go out power supply output cathode Vout.
Further, the metal-oxide-semiconductor Q1 and metal-oxide-semiconductor Q2 is P-channel MOSFET；The triode Q5 and described three
Pole pipe Q6 is NPN type triode.
Further, the Backup Power Switch circuit includes metal-oxide-semiconductor Q3 and metal-oxide-semiconductor Q4；The stand-by power supply input is just
Pole V2+ electrically connects with the S poles of the metal-oxide-semiconductor Q3, after stand-by power supply input positive pole V2+ series resistances R3 with the metal-oxide-semiconductor
Q3 G poles electrical connection；Electrically connected after the G poles series resistance R7 of the metal-oxide-semiconductor Q3 with triode Q7 colelctor electrode；The metal-oxide-semiconductor
Q3 D poles electrically connect with the D poles of the metal-oxide-semiconductor Q4；Current collection after the G poles series resistance R8 of the metal-oxide-semiconductor Q4 with triode Q8
Pole electrically connects；The triode Q7 and the triode Q8 base stage are electrically connected with Backup Power Switch control signal SW_BAT
Connect, the triode Q7 and the triode Q8 emitter stage electrically connect with GND；The Backup Power Switch control signal
Electrically connected after SW_BAT connection pull-up resistors R12 with D/C power；Resistance R4 is connected between the S poles and G poles of the metal-oxide-semiconductor Q4；Institute
State metal-oxide-semiconductor Q4 S poles out-put supply output cathode Vout.
Further, the metal-oxide-semiconductor Q3 and metal-oxide-semiconductor Q4 is P-channel MOSFET；The triode Q7 and described three
Pole pipe Q8 is NPN type triode.
Further, the power supply switching dead band delay circuit includes electric capacity C1 and diode D1；The electric capacity C1's is negative
Pole electrically connects with GND, after the positive pole of the electric capacity C1 diode D1 and resistance R9 in parallel with the power supply output cathode
Vout is electrically connected；The positive pole of the diode D1 electrically connects with the positive pole of the electric capacity C1, the negative pole of the diode D1 and institute
State power supply output cathode Vout electrical connections.
Further, the power supply handover trigger circuit includes sample circuit and comparison circuit；The sample circuit input
End electrically connects with main power source input positive pole V1+, and the sample circuit output end electrically connects with the comparison circuit；The ratio
Be provided with two output ends compared with circuit, described two output ends respectively with the main power switch circuit and the Backup Power Switch
The input electrical connection of circuit.
Further, the sample circuit includes resistance R13 and circuit network；Main power source inputs positive pole V1+ series resistances
Electrically connected after R13 and circuit network with GND.Node between resistance R13 and circuit network as sample circuit output end with than
Input compared with circuit electrically connects；Circuit network is specially resistance R14, electric capacity C3, electric capacity C4 and diode D2 parallel network.
Further, the comparison circuit includes single-chip microcomputer IC1；The output end of the sample circuit and the single-chip microcomputer
IC1 I/O port electrical connection；Two other I/O port of the single-chip microcomputer IC1 exports the main power source respectively as output end
The switch controlling signal SW_DC and Backup Power Switch control signal SW_BAT.
Compared with prior art, the application can be obtained including following technique effect：Dead band delay function can not only be real
Existing seamless main power supply switching, additionally it is possible to protect, increase the service life to load；Using MOSFET as switch member
Part, its small volume, conducting resistance are small, power attenuation is low, beneficial to the integrated and energy-conservation of circuit；It can be widely applied to need uninterruptedly
In the medicine equipment of power supply, industrial equipment.
Certainly, implementing any product of the application must be not necessarily required to reach all the above technique effect simultaneously.
Brief description of the drawings
Accompanying drawing described herein is used for providing further understanding of the present application, forms the part of the application, this Shen
Schematic description and description please is used to explain the application, does not form the improper restriction to the application.In the accompanying drawings：
Fig. 1 is the overall theory diagram of the application switching circuit.
Fig. 2 is the power switch circuit schematic diagram of the application main power source.
Fig. 3 is the power switch circuit schematic diagram of the application stand-by power supply.
Fig. 4 is the application power supply switching dead band delay circuit diagram.
Fig. 5 is the application power supply handover trigger circuit theory diagrams.
Wherein, in figure：
V1+：Main power source inputs positive pole；
V2+：Stand-by power supply inputs positive pole；
SW_DC：Main power switch control signal；
SW_BAT：Backup Power Switch control signal；
Vout：Power supply output cathode.
Embodiment
Presently filed embodiment is described in detail below in conjunction with drawings and Examples, and thereby how the application is applied
Technological means can fully understand and implement according to this to solve technical problem and reach the implementation process of technical effect.
As shown in figure 1, a kind of direct current main secondary power switching circuit, including main power switch circuit, Backup Power Switch electricity
Road, power supply handover trigger circuit and power supply switching dead band delay circuit.Main power switch circuit and Backup Power Switch circuit point
Do not electrically connected with main power source and stand-by power supply, and main power switch circuit and Backup Power Switch circuit are dead with power supply switching respectively
Area's delay circuit electrical connection.The input of power supply handover trigger circuit is electrically connected with main power source, and output end is opened with main power source respectively
Powered-down road and the electrical connection of Backup Power Switch circuit.
As shown in Fig. 2 main power switch circuit includes two metal-oxide-semiconductor Q1 and Q2, Q1 and Q2 uses P-channel MOSFET.
Main power source input positive pole V1+ electrically connects with metal-oxide-semiconductor Q1 S poles, is electrically connected after V1+ series resistances R1 with metal-oxide-semiconductor Q1 G poles.MOS
Electrically connected after pipe Q1 G poles series resistance R5 with triode Q5 colelctor electrode.Metal-oxide-semiconductor Q1 D poles are electrically connected with metal-oxide-semiconductor Q2 D poles
Connect.Electrically connected after metal-oxide-semiconductor Q2 G poles series resistance R6 with triode Q6 colelctor electrode.Triode Q5 and triode Q6 base stage
Electrically connected with main power switch control signal SW_DC, emitter stage electrically connects with GND.Main power switch control signal SW_DC
Connect after pull-up resistor R11 with DC5V power electric connections.Resistance R2 is connected between metal-oxide-semiconductor Q2 S poles and G poles.Metal-oxide-semiconductor Q2 S
Pole out-put supply output cathode Vout.
When main power switch control signal SW_DC is high level, triode Q5 and Q6 are both turned on, metal-oxide-semiconductor Q1 and Q2 G
Pole tension puts height, Q1, Q2 conducting, realizes V1+ and Vout conducting, main power source power supply.Conversely, V1+ and Vout's is separated, it is main
Power outage.
As shown in figure 3, Backup Power Switch circuit includes two metal-oxide-semiconductor Q3 and Q4, Q3 and Q4 uses P-channel
MOSFET.Stand-by power supply input positive pole V2+ electrically connected with metal-oxide-semiconductor Q3 S poles, after V2+ series resistances R3 with metal-oxide-semiconductor Q3 G poles
Electrical connection.Electrically connected after metal-oxide-semiconductor Q3 G poles series resistance R7 with triode Q7 colelctor electrode.Metal-oxide-semiconductor Q3 D poles and metal-oxide-semiconductor Q4
D poles electrical connection.Electrically connected after metal-oxide-semiconductor Q4 G poles series resistance R8 with triode Q8 colelctor electrode.Triode Q7 and triode
Q8 base stage electrically connects with Backup Power Switch control signal SW_BAT, and emitter stage electrically connects with GND.Backup Power Switch
After control signal SW_BAT connection pull-up resistors R12 with DC5V power electric connections.Resistance is connected between metal-oxide-semiconductor Q4 S poles and G poles
R4.Metal-oxide-semiconductor Q4 S poles out-put supply output cathode Vout.
Triode Q1, Q2, Q3, Q4 are NPN type triode.
When Backup Power Switch control signal SW_BAT is high level, triode Q7 and Q8 are both turned on, metal-oxide-semiconductor Q3 and Q4
G pole tensions put height, Q3, Q4 conducting, realize V2+ and Vout conducting, stand-by power supply power supply.Conversely, V2+ and Vout interruption
Open, stand-by power supply is stopped power supply.
As shown in figure 4, power supply switching dead band delay circuit includes electric capacity C1 and diode D1.Electric capacity C1 negative pole and GND
Electrically connect, electrically connected after positive pole parallel diode D1 and resistance R9 with power supply output cathode Vout.Diode D1 positive pole and electricity
Hold C1 positive pole electrical connection, negative pole electrically connects with power supply output cathode Vout.
As shown in figure 5, power supply handover trigger circuit includes sample circuit and comparison circuit, sample circuit input and main electricity
Source input positive pole V1+ electrical connections, output end electrically connect with comparison circuit.The sampling voltage collected is delivered to ratio by sample circuit
It is compared compared with circuit.Comparison circuit is realized using single-chip microcomputer IC1.The voltage signal that sample circuit conveying comes is set with interior
Reference voltage is compared, and out-put supply switch controlling signal.
Sample circuit includes resistance R13, resistance R14, electric capacity C3, electric capacity C4, diode D2.Main power source input positive pole V1+
Electrically connected after series resistance R13 and circuit network with GND.Node between resistance R13 and circuit network is defeated as sample circuit
Go out end to electrically connect with the single-chip microcomputer IC1 of comparison circuit.Circuit network is specially resistance R14, electric capacity C3, electric capacity C4 and diode D2
Parallel network.Comparison circuit includes single-chip microcomputer IC1, and single-chip microcomputer IC1 selects PIC16F1783, and PIC16F1783 single-chip microcomputers are not only
Comparator is built-in with, is also built-in with 2.048V reference voltage, can be used to enter to press value signal compared with reference voltage outside
And different level signals is exported according to comparative result.The output end of sample circuit electrically connects with single-chip microcomputer IC1 I/O port, monolithic
The I/O port that two of machine IC1 are used as output controls with output main power switch control signal SW_DC and Backup Power Switch respectively
Signal SW_BAT, i.e. the two of the single-chip microcomputer IC1 I/O port input with main power switch circuit and Backup Power Switch circuit respectively
End electrical connection.
Sample circuit carries out partial pressure and sampling to initial main power voltage signal, and sampled signal is conveyed into single-chip microcomputer
IC1.Single-chip microcomputer IC1 built-in comparator to main power voltage compared with internal reference voltage, when input voltage is less than base
During quasi- magnitude of voltage, single-chip microcomputer IC1 two output ends output low level, so as to close main power switch and Backup Power Switch,
Be delayed 0.5~2mS, and Backup Power Switch control signal SW_BAT is put into height, so as to open Backup Power Switch, begun to use standby
It is powered with power supply.Complete the displacement of main power supply.Be delayed 0.5~2mS, can be using the timer inside single-chip microcomputer come real
It is existing, it can also be realized by SCM program, the SCM program for timing uses in most of software program,
Belong to prior art.A delay function mainly actually is used, and is circulated, it is different according to delay time,
Cycle-index is arranged to different.Here repeat no more.
In the time of delay, it is powered by power supply switching dead band delay circuit.Electric capacity C1 in the delay circuit of dead band exists
Power supply can be charged when powering.When power supply output has electricity, electric current charges after resistance R9 current limlitings to electric capacity C1,
Until the voltage at electric capacity C1 both ends is equal to electric power output voltage.In power supply powers time-continuing process, due to dead band delay circuit
Circuit structure, electric capacity C1 can be approximately considered without electric discharge.When main power supply switches over, main power supply switch while quilt
Closing, non-transformer power supply, electric capacity C1 starts to discharge, and by diode D1 to load supplying.Until stand-by power supply opening, electric capacity
C1 stops electric discharge and started to charge up, into circulation next time.Continual power supply is realized with this.When electric capacity C1 parameter and delay
Between match, that is, require electric capacity C1 deposit electric energy power can with delay time load power consumption match, avoid electric capacity C1 from putting
Power supply does not start the situation generation of power supply still after electricity.Under normal circumstances, the specified VC of capacitor C1 need to be more than out-put supply
Voltage (Vout) 2V, capacity are not less than 350 farads.Ultracapacitor can realize the stable power-supplying of heavy load equipment.
Delay 0.5~2mS after start stand-by power supply power supply be because, when carrying out main power supply switching, main power source
Supply voltage has had descended to a reference value, and now directly switching can cause the momentary variation of voltage, to the stability of load not
Profit.Power supply is enabled again after delay certain time, the time of one adaptation of load can be given, beneficial to the service life of load.
The beneficial effect of the application is：Dead band delay function can not only realize seamless main power supply switching, moreover it is possible to
It is enough that load is protected, increase the service life；Using MOSFET as switch element, its small volume, conducting resistance are small, power
Low, integrating and saving beneficial to circuit is lost；It can be widely applied to need in the medicine equipment of uninterrupted power supply, industrial equipment.
A kind of direct current main secondary power switching circuit provided above the embodiment of the present application, is described in detail.With
The explanation of upper embodiment is only intended to help and understands the present processes and its core concept；Meanwhile for the general of this area
Technical staff, according to the thought of the application, there will be changes in specific embodiments and applications, in summary,
This specification content should not be construed as the limitation to the application.
Some vocabulary has such as been used to censure specific components among specification and claim.Those skilled in the art should
It is understood that hardware manufacturer may call same component with different nouns.This specification and claims are not with name
The difference of title is used as the mode for distinguishing component, but is used as the criterion of differentiation with the difference of component functionally.Such as logical
The "comprising" of piece specification and claim mentioned in is an open language, therefore should be construed to " include but do not limit
In "." substantially " refer in receivable error range, those skilled in the art can be described within a certain error range solution
Technical problem, basically reach the technique effect.Specification subsequent descriptions are so described to implement the better embodiment of the application
Description is for the purpose of the rule for illustrating the application, is not limited to scope of the present application.The protection domain of the application
It is defined when depending on appended claims institute defender.
It should also be noted that, term " comprising ", "comprising" or its any other variant are intended to nonexcludability
Comprising, so that commodity or system including a series of elements not only include those key elements, but also including without clear and definite
The other element listed, or also include for this commodity or the intrinsic key element of system.In the feelings not limited more
Under condition, the key element that is limited by sentence "including a ...", it is not excluded that in the commodity including the key element or system also
Other identical element be present.
Some preferred embodiments of the application have shown and described in described above, but as previously described, it should be understood that the application
Be not limited to form disclosed herein, be not to be taken as the exclusion to other embodiment, and available for various other combinations,
Modification and environment, and above-mentioned teaching or the technology or knowledge of association area can be passed through in application contemplated scope described herein
It is modified., then all should be in this Shen and the change and change that those skilled in the art are carried out do not depart from spirit and scope
Please be in the protection domain of appended claims.
Claims (9)
- A kind of 1. direct current main secondary power switching circuit, it is characterised in that：Including main power switch circuit, Backup Power Switch electricity Road, power supply handover trigger circuit and power supply switching dead band delay circuit；The main power switch circuit and the stand-by power supply are opened Powered-down road inputs positive pole V1+ with main power source respectively and stand-by power supply input positive pole V2+ is electrically connected, and the main power switch circuit Electrically connected respectively with power supply switching dead band delay circuit with the Backup Power Switch circuit；The power supply handover trigger electricity The input on road and the main power source input positive pole electrically connect, output end respectively with the main power switch circuit and described standby Power switch circuit electrically connects.
- 2. direct current main secondary power switching circuit according to claim 1, it is characterised in that：The main power switch circuit includes Metal-oxide-semiconductor Q1 and metal-oxide-semiconductor Q2；The main power source input positive pole V1+ electrically connects with the S poles of the metal-oxide-semiconductor Q1, the main power source input Electrically connected after positive pole V1+ series resistances R1 with the G poles of the metal-oxide-semiconductor Q1；With three after the G poles series resistance R5 of the metal-oxide-semiconductor Q1 Pole pipe Q5 colelctor electrode electrical connection；The D poles of the metal-oxide-semiconductor Q1 electrically connect with the D poles of the metal-oxide-semiconductor Q2；The G of the metal-oxide-semiconductor Q2 Electrically connected after the series resistance R6 of pole with triode Q6 colelctor electrode；The triode Q5 and the triode Q6 base stage with master Power switch control signal SW_DC is electrically connected, and the triode Q5 and the triode Q6 emitter stage electrically connect with GND； Electrically connected after the main power switch control signal SW_DC connection pull-up resistors R11 with D/C power；The S poles of the metal-oxide-semiconductor Q2 and Resistance R2 is connected between G poles；The S poles out-put supply output cathode Vout of the metal-oxide-semiconductor Q2.
- 3. direct current main secondary power switching circuit according to claim 2, it is characterised in that：The metal-oxide-semiconductor Q1 and the metal-oxide-semiconductor Q2 is P-channel MOSFET；The triode Q5 and triode Q6 is NPN type triode.
- 4. direct current main secondary power switching circuit according to claim 1, it is characterised in that：The Backup Power Switch circuit bag Include metal-oxide-semiconductor Q3 and metal-oxide-semiconductor Q4；The stand-by power supply input positive pole V2+ electrically connects with the S poles of the metal-oxide-semiconductor Q3, the standby electricity Electrically connected after the input positive pole V2+ series resistances R3 of source with the G poles of the metal-oxide-semiconductor Q3；The G poles series resistance R7 of the metal-oxide-semiconductor Q3 The colelctor electrode with triode Q7 electrically connects afterwards；The D poles of the metal-oxide-semiconductor Q3 electrically connect with the D poles of the metal-oxide-semiconductor Q4；The metal-oxide-semiconductor Electrically connected after Q4 G poles series resistance R8 with triode Q8 colelctor electrode；The triode Q7 and the triode Q8 base stage Electrically connected with Backup Power Switch control signal SW_BAT, the triode Q7 and triode Q8 emitter stage with GND is electrically connected；Electrically connected after the Backup Power Switch control signal SW_BAT connection pull-up resistors R12 with D/C power；It is described Resistance R4 is connected between metal-oxide-semiconductor Q4 S poles and G poles；The S poles out-put supply output cathode Vout of the metal-oxide-semiconductor Q4.
- 5. direct current main secondary power switching circuit according to claim 4, it is characterised in that：The metal-oxide-semiconductor Q3 and the metal-oxide-semiconductor Q4 is P-channel MOSFET；The triode Q7 and triode Q8 is NPN type triode.
- 6. according to any direct current main secondary power switching circuits of claim 1-5, it is characterised in that：The power supply switches dead band Delay circuit includes electric capacity C1 and diode D1；The negative pole of the electric capacity C1 electrically connects with GND, and the positive pole of the electric capacity C1 is in parallel Electrically connected after the diode D1 and resistance R9 with the power supply output cathode Vout；The positive pole of the diode D1 and the electricity Hold C1 positive pole electrical connection, the negative pole of the diode D1 electrically connects with the power supply output cathode Vout.
- 7. direct current main secondary power switching circuit according to claim 6, it is characterised in that：The power supply handover trigger circuit bag Include sample circuit and comparison circuit；The sample circuit input electrically connects with main power source input positive pole V1+, the sampling Circuit output end electrically connects with the comparison circuit；The comparison circuit is provided with two output ends, described two output end difference Electrically connected with the input of the main power switch circuit and the Backup Power Switch circuit.
- 8. direct current main secondary power switching circuit according to claim 7, it is characterised in that：The sample circuit includes resistance R13 and circuit network；Main power source electrically connects after inputting positive pole V1+ series resistances R13 and circuit network with GND.Resistance R13 and electricity Node between road network electrically connects as sample circuit output end with the input of comparison circuit；Circuit network is specially resistance R14, electric capacity C3, electric capacity C4 and diode D2 parallel network.
- 9. direct current main secondary power switching circuit according to claim 7, it is characterised in that：The comparison circuit includes single-chip microcomputer IC1；The output end of the sample circuit electrically connects with an I/O port of the single-chip microcomputer IC1；Other the two of the single-chip microcomputer IC1 Individual I/O port exports the main power switch control signal SW_DC and Backup Power Switch control letter respectively as output end Number SW_BAT.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710802934.0A CN107516936B (en) | 2017-09-08 | 2017-09-08 | Direct current activestandby power supply switching circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710802934.0A CN107516936B (en) | 2017-09-08 | 2017-09-08 | Direct current activestandby power supply switching circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107516936A true CN107516936A (en) | 2017-12-26 |
| CN107516936B CN107516936B (en) | 2022-03-22 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710802934.0A Active CN107516936B (en) | 2017-09-08 | 2017-09-08 | Direct current activestandby power supply switching circuit |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109633291A (en) * | 2018-12-20 | 2019-04-16 | 兰州空间技术物理研究所 | Bias current master backup switching circuit in a kind of space electric field detection system |
| CN110994774A (en) * | 2019-11-11 | 2020-04-10 | 广州亚美智造科技有限公司 | Power supply switching circuit |
| CN111817425A (en) * | 2019-04-12 | 2020-10-23 | 上海亿盟电气自动化技术有限公司 | Automatic switching circuit of low-voltage apparatus stand-by power supply |
| CN115514059A (en) * | 2022-10-26 | 2022-12-23 | 中山亿联智能科技有限公司 | Fingerprint padlock low-power consumption circuit based on MOS manages control |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109633291A (en) * | 2018-12-20 | 2019-04-16 | 兰州空间技术物理研究所 | Bias current master backup switching circuit in a kind of space electric field detection system |
| CN109633291B (en) * | 2018-12-20 | 2020-11-27 | 兰州空间技术物理研究所 | Bias current main backup switching circuit in space electric field detection system |
| CN111817425A (en) * | 2019-04-12 | 2020-10-23 | 上海亿盟电气自动化技术有限公司 | Automatic switching circuit of low-voltage apparatus stand-by power supply |
| CN110994774A (en) * | 2019-11-11 | 2020-04-10 | 广州亚美智造科技有限公司 | Power supply switching circuit |
| CN110994774B (en) * | 2019-11-11 | 2022-03-08 | 广州亚美智造科技有限公司 | Power supply switching circuit |
| CN115514059A (en) * | 2022-10-26 | 2022-12-23 | 中山亿联智能科技有限公司 | Fingerprint padlock low-power consumption circuit based on MOS manages control |
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| CN107516936B (en) | 2022-03-22 |
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