CN109217459A - A kind of switching circuit of multiple power supplies input - Google Patents
A kind of switching circuit of multiple power supplies input Download PDFInfo
- Publication number
- CN109217459A CN109217459A CN201811093652.9A CN201811093652A CN109217459A CN 109217459 A CN109217459 A CN 109217459A CN 201811093652 A CN201811093652 A CN 201811093652A CN 109217459 A CN109217459 A CN 109217459A
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- CN
- China
- Prior art keywords
- circuit
- power supply
- battery
- control circuit
- external 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
- 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
-
- 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
The invention discloses a kind of switching circuits of multiple power supplies input, including detection and control circuit, battery supply control circuit, battery and external power supply, wherein the first input end of detection and control circuit is connect with battery, the second input terminal is connect with external power supply, the first output end is connect by battery supply control circuit with late-class circuit；By detection and control circuit detection and the size between the output voltage of control cell and the output voltage of external power supply, and then the working condition of battery supply control circuit is controlled, selects battery power supply mode or external power supply power supply mode for late-class circuit.The present invention have low in energy consumption, fever less, the advantages that circuit design is simple.
Description
Technical field
The present invention relates to the switching circuits that multiple power supplies input circuit more particularly to a kind of multiple power supplies input.
Background technique
Electronic equipment is daily in use environment, it is often necessary to use different power supply modes, existing electronic product is more
Using the power supply mode of adapter and battery combination, at this moment just need to carry out battery and power supply using multiple power supplies input circuit
Switching between adapter.The more reversed cut-off circuit using diode of conventional multi-way electrical source input circuit, come switch battery with
Power supply adaptor power supply；Or use multiple metal-oxide-semiconductors, diode and resistance collocation multiple power supplies input circuit.Such as Patent No.
In the patent of CN106356988A, propose it is a kind of be made of three metal-oxide-semiconductors and three diodes and other related devices it is more
Road power supply input circuit can be realized the switching of battery power supply with adapter power supply；Patent No. CN102270876A for another example
Patent in, equally propose a kind of multiple power supplies input circuit being made of multiple metal-oxide-semiconductors, by single-chip microcontroller it is more each
Road input voltage controls the switching between different input powers.But for only use the reversed cut-off characteristics of diode build it is more
Road power input switching circuit, circuit power consumption is big, and fever is serious when passing through high current.This is because diode self-characteristic is led
It causes, diode forward conduction voltage drop Δ U is 0.5-0.7V, when diode is I by electric current, generates power consumption P=Δ on pipe
U·I.When electric current I is larger, power consumption P also can be very big on pipe, causes serious phenomenon of generating heat.
For the multiple power supplies input-switching circuit constituted during more metal-oxide-semiconductors and periphery is used, circuit is complicated, sometimes also
Individual MCU is needed to make comparisons and control, the space occupied on pcb board is big, and that there are design costs is high, system power dissipation is big etc. asks
Topic.
Summary of the invention
For overcome the deficiencies in the prior art, the purpose of the present invention is to provide a kind of switchings based on multiple power supplies input
Circuit, can solve multiple power supplies in the prior art input control circuit its there are circuits it is complicated, power consumption is big the problems such as.
The purpose of the present invention is implemented with the following technical solutions:
A kind of switching circuit of multiple power supplies input, including detection and control circuit, battery supply control circuit, battery and
External power supply, wherein the first input end of detection and control circuit is connect with battery, the second input terminal is connect with external power supply, the
One output end is connect by battery supply control circuit with late-class circuit；The defeated of control cell is detected by detection and control circuit
Size between voltage and the output voltage of external power supply out, and then the working condition of battery supply control circuit is controlled, after being
Grade circuit selection battery power supply mode or external power supply power supply mode.
Further, the detection and control circuit include control chip U1, and battery supply control circuit includes that switching is opened
It closes and PMOS tube Q1；The first input end of control chip U1 is connect with battery, the second input terminal is connect with external power supply, output end
It is connect by switching switch with the grid of PMOS tube Q1.
Further, the model Sl3483 of the model LTC4414MES8 of the chip U1, PMOS tube Q1.
It further, further include the anti-down current circuit of electric current, external power supply passes through the anti-down current circuit of electric current and detection and control
Circuit is electrically connected；The anti-down current circuit of electric current damages the electricity of external power supply for preventing the electric current backflow of battery to external power supply
Device equipment.
Further, the anti-down current circuit of the electric current includes diode D6, the anode of diode D6 connect with external power supply,
Cathode is connect with detection and the second input terminal of control circuit, cathode is also connect with rear polar circuit.
It further, further include indicating circuit, wherein indicating circuit is connect with the second output terminal of detection and control circuit；
Detection and control circuit are generated by comparing the size of input voltage and the input voltage of the second input terminal of first input end
Third controls signal, and third control signal is output to indicating circuit, and then control instructions circuit by second output terminal
Working condition.
Further, the indicating circuit includes resistance R1, power supply VCC and indicator, and wherein power supply VCC passes through resistance R1
It is connect with the second output terminal of detection and control circuit, the second output terminal of detection and control circuit is also connect with indicator, is used
In the working condition of control instructions device.
Further, work as VBattery-20mV>VExternal power supplyWhen, detection and control circuit generate first control signal, and by this first
Control signal is sent to battery supply control circuit by the first output end, and then controls the work shape of battery supply control circuit
State selects through battery to be late-class circuit power supply；Work as VBattery-20mV<VExternal power supply, or when there is no external power supply, detection and control
Circuit evolving second control signal, and the second control signal is sent to battery supply control circuit by the first output end,
And then the working condition of battery supply control circuit is controlled, it selects through external power supply to be late-class circuit power supply；Wherein, VBatteryFor
The output voltage of battery, VExternal power supplyFor the output voltage of external power supply.
Compared with prior art, the beneficial effects of the present invention are:
The present invention detects the voltage of battery and external power supply by detection and control circuit, and according to the voltage of the two
Size controls the working condition of battery supply control circuit, and then provides corresponding power supply mode for late-class circuit.The present invention
Circuit design it is simple, it is low in energy consumption, small in size, in production space on pcb board can be greatly saved, extend making for battery
Use the service life.
Detailed description of the invention
Fig. 1 is the module map of the switching circuit of multiple power supplies provided by the invention input；
Fig. 2 is the circuit diagram of the switching circuit of multiple power supplies provided by the invention input.
Specific embodiment
In the following, being described further in conjunction with attached drawing and specific embodiment to the present invention, it should be noted that not
Under the premise of conflicting, new implementation can be formed between various embodiments described below or between each technical characteristic in any combination
Example.
The present invention provides a kind of multiple power supplies input switching circuit, as shown in Figure 1, include detection and control circuit,
Battery supply control circuit, battery and external power supply.
Wherein, the first input end of detection and control circuit is connect with battery, the second input terminal is connect with external power supply, the
One output end is connect with the first input end of battery supply control circuit.The power input and battery of battery supply control circuit
Connection, output end and late-class circuit are electrically connected.
Detection and control circuit are used to detect the size of voltage between battery and external power supply, and according to battery and external electrical
The size of voltage between source controls the working condition of battery supply control circuit, and then provides corresponding confession for late-class circuit
Electric mode.External power supply can by but be not limited to power supply adaptor power supply, input voltage range be 6V~26V.
In addition, late-class circuit can by but be not limited to cpu control circuit, digital signal processing circuit, sensor circuit, power supply
The circuits such as circuit are constituted.
For example, the present invention can compare the voltage of external power supply and battery by detection and control circuit: working as VExternal power supply>VBattery-
When 20mV, then detection and control circuit are to battery supply control circuit input first control signal, and then control battery supply control
The working condition of circuit processed selects external power supply to supply electricity to late-class circuit power supply；Work as VExternal power supply<VBatteryWhen -20mV or external power supply
When without input, detection and control circuit control battery supply control to battery supply control circuit input second control signal
The working condition of circuit processed selects battery to supply electricity to late-class circuit.Certainly, the ratio of both judgements here voltage swing, can
It is configured according to specific demand, it is 20mV bigger than cell voltage to be not limited to only external power supply mentioned in the present invention
When above, external power supply power supply is selected.
In addition, also adding the anti-down current circuit of electric current in the present invention, it that is to say, in detection and control circuit and external power supply
Between increase the anti-down current circuit of electric current, in this way, when system select battery be late-class circuit power when, the electric current of battery can be prevented
External power source circuit is flowed backward to, and then damages the electrical equipment of external power source circuit.
Further, the invention also includes indicating circuit, the second output terminal and indicating circuit of detection and control circuit
Connection.It is external power supply or battery that the indicating circuit, which is used to indicate current power supply, is indicated by the indicating circuit
Power supply state.For example when late-class circuit is that battery is powered, detection and control circuit export high level, indicating circuit bright light；When
When late-class circuit is that external power supply is powered, detection and control circuit export low level, and indicating circuit is turned off the light.Instruction in the present invention
Circuit can by but be not limited to LED light, CPUIO mouthfuls, sensor indicated.
As shown in Fig. 2, the present invention also provides the circuit diagrams of the switching circuit, wherein detect and control circuit is by controlling
Coremaking piece U1 and its peripheral circuit are constituted, wherein the model LTC4414MES8 of control chip U1.
The anti-down current circuit of electric current is made of a piece of Schottky diode D6, the anode and external electrical of Schottky diode D6
Source (VCC_Adapater in Fig. 2) connection, cathode are connect with detection and control circuit.The model of Schottky diode D6
RB056L。
The input terminal VIN of control chip U1 connect with battery (VCC_BATT in Fig. 2), input terminal SENSE and diode
The cathode connection of D6, output end GATE are connect with the input terminal of battery supply control circuit.
It that is to say, the present invention detects the size of the voltage of two-way power input using a control chip U1, and exports
Signal is controlled to control the working condition of corresponding battery supply control circuit, circuit structure is simple, cost is relatively low.
Battery supply control circuit include PMOS tube Q1 and switching switch TP218, PMOS tube Q1 use TrenchFET or
The power MOS pipe of HEXEFT type.The output end GATE in other words controlling chip U1 passes through switching switch TP218 and PMOS tube
The grid G of Q1 connects, and the drain D of PMOS tube is connect with late-class circuit, and the source S of PMOS tube is connect with battery.
Wherein, the model Sl3483 of PMOS tube Q1.The present invention controls on/off by using PMOS tube, due to this
PMOS tube conducting internal resistance is small, small in size, and conducting internal resistance can usually accomplish 50m Ω even 10m Ω hereinafter, circuit works normally
Afterwards, the loss on power link is smaller, therefore the power consumption of circuit provided by the invention is lower.
Indicating circuit is made of the output end STAT of chip U1, pull-up resistor R1, power supply VCC and indicator, wherein should
Power supply VCC can be provided by late-class circuit, can also be provided by other power supplys, and the voltage of power supply VCC is 3.3V.Indicator is not
Only LED light mentioned in the present invention, CPUIO mouthfuls, sensor etc..
The working principle of the switching circuit is as follows:
As the input voltage V of the input terminal VIN of chip U1in- 20mV is greater than the input voltage V of input terminal SENSEsenseWhen,
Output end GATE exports low level, so that control PMOS tube Q1 conducting, that is to say and open P-channel power MOSFET, so that
Late-class circuit is battery powered.
As the input voltage V of the input terminal VIN as chip U1in- 20mV is less than the input voltage V of input terminal SENSEsense
When, output end GATE exports high level, so that control PMOS tube Q1 is disconnected, that is to say and closes P-channel power MOSFET, make
Late-class circuit is obtained to be powered by external power supply.Wherein, Vin=VBattery, Vsense=VExternal power supply。
And the working principle of indicating circuit are as follows: when late-class circuit is battery powered, the output signal of output end STAT is
The high level of 3.3V, and then the work of control instructions device, such as bright light；When late-class circuit is powered by external power supply, output end
The output signal of STAT is the low level of 0V, and then the work of control instructions device, for example is turned off the light.
The circuit design of the control circuit of multiple power supplies provided by the invention input is simple, saves space on pcb board,
Substantially reduce cost；When being powered using battery, possesses lower power consumption, extend the service life of battery.The present invention also has
Available electricity indicates function, gives instruction for different power supply modes.
The above embodiment is only the preferred embodiment of the present invention, and the scope of protection of the present invention is not limited thereto,
The variation and replacement for any unsubstantiality that those skilled in the art is done on the basis of the present invention belong to institute of the present invention
Claimed range.
Claims (8)
1. a kind of switching circuit of multiple power supplies input, it is characterised in that: including detection and control circuit, battery supply control electricity
Road, battery and external power supply, wherein the first input end of detection and control circuit is connect with battery, the second input terminal and external electrical
Source connection, the first output end are connect by battery supply control circuit with late-class circuit；Pass through detection and control circuit detection pair
Than the size between the output voltage of battery and the output voltage of external power supply, and then control the work of battery supply control circuit
State selects battery power supply mode or external power supply power supply mode for late-class circuit.
2. switching circuit according to claim 1, it is characterised in that: the detection and control circuit include control chip
U1, battery supply control circuit include switching switch and PMOS tube Q1；The first input end of control chip U1 connect with battery, the
Two input terminals are connect with external power supply, output end is connect by switching switch with the grid of PMOS tube Q1.
3. switching circuit according to claim 2, it is characterised in that: the model LTC4414MES8 of the chip U1,
The model Sl3483 of PMOS tube Q1.
4. switching circuit according to claim 1, it is characterised in that: further include the anti-down current circuit of electric current, external power supply is logical
The anti-down current circuit of overcurrent and detection and control circuit are electrically connected；The anti-down current circuit of electric current is used to prevent the electric current backflow of battery
To external power supply, the electrical equipment of external power supply is damaged.
5. switching circuit according to claim 4, it is characterised in that: the anti-down current circuit of electric current includes diode D6,
The anode of diode D6 connect with external power supply, cathode and detection and the connection of the second input terminal of control circuit, cathode also with rear pole
Circuit connection.
6. switching circuit according to claim 1, it is characterised in that: it further include indicating circuit, wherein indicating circuit and inspection
It surveys and the second output terminal of control circuit connects；The input voltage and second that detection and control circuit pass through comparison first input end
The third is controlled signal output by second output terminal to generate third control signal by the size of the input voltage of input terminal
To indicating circuit, and then the working condition of control instructions circuit.
7. switching circuit according to claim 6, it is characterised in that: the indicating circuit include resistance R1, power supply VCC and
Indicator, wherein power supply VCC is connect by resistance R1 with the second output terminal of detection and control circuit, is detected and control circuit
Second output terminal is also connect with indicator, the working condition for control instructions device.
8. switching circuit according to claim 1, it is characterised in that: work as VBattery-20mV>VExternal power supplyWhen, detection and control are electric
Road generates first control signal, and the first control signal is sent to battery supply control circuit by the first output end, into
And the working condition of battery supply control circuit is controlled, it selects through battery to be late-class circuit power supply；Work as VBattery-20mV<VExternal power supply,
Or when not having external power supply, detection and control circuit generate second control signal, and the second control signal is passed through first
Output end is sent to battery supply control circuit, and then controls the working condition of battery supply control circuit, and selection passes through outside
Power supply is late-class circuit power supply；Wherein, VBatteryFor the output voltage of battery, VExternal power supplyFor the output voltage of external power supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811093652.9A CN109217459A (en) | 2018-09-19 | 2018-09-19 | A kind of switching circuit of multiple power supplies input |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811093652.9A CN109217459A (en) | 2018-09-19 | 2018-09-19 | A kind of switching circuit of multiple power supplies input |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109217459A true CN109217459A (en) | 2019-01-15 |
Family
ID=64984616
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811093652.9A Pending CN109217459A (en) | 2018-09-19 | 2018-09-19 | A kind of switching circuit of multiple power supplies input |
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| CN (1) | CN109217459A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022028205A1 (en) * | 2020-08-06 | 2022-02-10 | 苏州一路连科科技有限公司 | Detonation control system and detonation method for fire extinguisher ball |
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