CN208874344U - Main power source and backup power source switching circuit and switching device - Google Patents

Main power source and backup power source switching circuit and switching device Download PDF

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Publication number
CN208874344U
CN208874344U CN201821254624.6U CN201821254624U CN208874344U CN 208874344 U CN208874344 U CN 208874344U CN 201821254624 U CN201821254624 U CN 201821254624U CN 208874344 U CN208874344 U CN 208874344U
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China
Prior art keywords
power source
main power
pole
output
circuit
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CN201821254624.6U
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梁育宁
陈未远
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BEIJING HYLITON POWER TECHNOLOGY Co Ltd
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BEIJING HYLITON POWER TECHNOLOGY Co Ltd
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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02BCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/30Systems 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
    • YGENERAL 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
    • Y04INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04SSYSTEMS 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
    • Y04S20/00Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
    • Y04S20/20End-user application control systems

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Abstract

The utility model relates to a kind of main power source and backup power source switching circuits and a kind of main power source and standby power switching device.The switching circuit includes the first PMOS tube, second PMOS tube and NMOS tube, the pole D of first PMOS tube connects main power source incoming end, the pole S connects power output end, the pole S of second PMOS tube connects backup power source incoming end, the pole D connects power output end, the pole the S connection circuit of the NMOS tube, the pole D connects the pole G of first PMOS tube, the pole G of second PMOS tube and the pole G of the NMOS tube are all connected with main power source detection level incoming end, first resistor is connected between the pole G and the pole S of first PMOS tube, second resistance is connected between the main power source detection level incoming end and circuit ground.The switching device carries out the switching of main power source and backup power source using above-mentioned switching circuit.The switching of main power source and backup power source can be better achieved in the utility model, and in favor of saving backup power source energy, and it is steady to realize that main power source switches with backup power source.

Description

Main power source and backup power source switching circuit and switching device
Technical field
The utility model relates to a kind of main power sources and backup power source switching circuit, further relate to a kind of using this switching circuit Main power source and standby power switching device, belong to power supply and field of circuit control.
Background technique
In current electronic equipment, the stability of power supply is particularly important, and in many applications, electronic equipment all has two Power supply.Especially in the equipment of some main power source energy resource collecting schemes, under the influence of extraneous factor variation, main power source may Meeting power output is inadequate or unstable.For the stabilization for guaranteeing output power, it can be equipped with main power source status monitoring under normal conditions Unit and power supply switch circuit, for monitoring main power source state and being switched in main power source exception backup power source (the second electricity Source).
Existing numerous power supply switch circuit mainly uses double diode power supply handover scheme and relay power switching side Case, both handover schemes all have the defects that certain, and under normal operating conditions, main power source and backup power source may same lucks Row, and in Switching power, main power source or backup power source cannot be cut off well, cause energy dissipation or phase is not achieved The power management purpose answered.
Utility model content
In order to solve the above technical problems, the utility model provides a kind of main power source and backup power source switching circuit, also mention A kind of main power source and standby power switching device have been supplied, the switching of main power source and backup power source can be better achieved, in favor of Backup power source energy is saved, and it is steady to realize that main power source switches with backup power source.
The technical solution of the utility model is:
A kind of main power source and backup power source switching circuit comprising the first PMOS tube, the second PMOS tube and NMOS tube, it is described The pole D of first PMOS tube connects main power source incoming end, and the pole S connects power output end, and the pole the S connection of second PMOS tube is spare Power access end, the pole D connect power output end, and with connecting circuit (Ground, GND), the pole D connects institute for the pole S of the NMOS tube The pole G of the first PMOS tube is stated, the pole G of second PMOS tube and the pole G of the NMOS tube are all connected with main power source detection level and connect Enter end, first resistor, the main power source detection level incoming end and electricity are connected between the pole G and the pole S of first PMOS tube Road is connected with second resistance between ground.
Preferably, electric capacity of voltage regulation is connected between the power output end and circuit ground, the anode of the electric capacity of voltage regulation is even Connect the power output end.
Preferably, be also provided with main power source detection level output end, main power source detection level output end with it is described Main power source detects the connection of level incoming end.
Preferably, it is also provided with power output signal port.
A kind of main power source and standby power switching device comprising main power source, backup power source, for realizing main power source with it is standby The switching circuit that is switched with power supply and it is able to detect the main power source state detection unit of main power source output state, the switching is electric Road connects the master using the utility model any main power source and backup power source switching circuit, the output of the main power source The output of power access end, the backup power source connects the backup power source incoming end, and the main power source state detection unit exists The output end voltage of main power source exports high level when being higher than the lower threshold of setting, is lower than setting in the output end voltage of main power source Lower threshold when export low level, level output connects the main power source and detects level incoming end.
Preferably, between the main power source and the switching circuit be equipped with counterflow-preventing unit, the main power source it is positive and negative defeated It is separately connected the respective input of the counterflow-preventing unit out, the positive output of the anti-reverse current circuit connects the main power source access End, the negative output of the anti-reverse current circuit is with connecting the circuit.
The counterflow-preventing unit can use the prior art of any suitable, for example, two poles of LDO linear voltage regulator or isolation Pipe.
The main power source can be equipped with power management integrated circuit chip (abbreviation power management chip or power supply IC), with shape At stable output, and reduce unnecessary energy consumption, the power management chip can using any suitable the prior art or Other technologies.
The main power source state detection unit can use the prior art of any suitable, for example, can be in main power source Output end voltage be higher than setting lower threshold when output high level, main power source output end voltage lower than setting lower limit threshold Low level existing detection chip, comparison circuit and other various circuits that can satisfy above-mentioned requirements are exported when value.Existing Have under technical background, may include voltage acquisition element for acquiring main power source output voltage signal and be able to carry out voltage ratio Pair voltage detecting IC chip (abbreviation voltage checking chip or voltage detecting IC), the output of the voltage acquisition element Access the voltage detecting IC chip.
The backup power source may include battery or battery group and be equipped with for switching the battery or battery The electric discharge output of the charge and discharge electrical switching circuit of group charge and discharge status of electrically connecting, the charge and discharge electrical switching circuit constitutes the backup power source Output, the charge and discharge electrical switching circuit charging input be equipped with external power interface.The charge and discharge electrical switching circuit can adopt With the prior art of any suitable, to realize the switching to battery or battery group charge and discharge, using main power source as battery Or battery group charge power supply when, can be charged and by this main power source that switches in for battery or battery charging In the case of carry out required charging, in the case where main power source is unable to normal power supply and needs battery to load supplying, avoid Charging interference.
Preferably, the external power interface connects the input of the main power source, using main power source as battery or electric power storage The charge power supply of pond group.
The output of the main power source and backup power source can be 3.6V direct current or other adaptation outputs, for example, the master Power supply is used external communication electrotransformation as the ac-dc converter circuit of corresponding direct current output, and the backup power source is using corresponding rule The battery of lattice/battery group.
The main working process of the utility model switching circuit are as follows: when main power source is in normal operating conditions, main power source State detection unit can export high level, and the G pole tension Vg of NMOS tube is sufficiently more than its S pole tension Vs, then the pole D of NMOS tube and The conducting of the pole S, the G pole tension Vg of the first PMOS tube is pulled low, the S pole tension Vs of the first PMOS tube main power source and backup power source all Normal power supply voltage level can be kept in normal situation, so that the Vg of the first PMOS tube is sufficiently smaller than its Vs, the first metal-oxide-semiconductor is led Logical, main power source powers to the load, meanwhile, the second PMOS tube is since its Vg is approximately equal to its Vs, in the state of cutting, does not supply to load Electricity.There is exception when main power source works, voltage can decline, the threshold value of main power voltage decline can be set according to actual conditions, For example, the 80% of voltage rating, when main power source actual output voltage is lower than this threshold value, main power source state detection unit can be defeated Low level out, second resistance can draw the S step voltage Vs of NMOS tube the level to zero potential GND, so that the Vg of NMOS tube is intimate Equal to its Vs, NMOS tube cut-off, at this time without electric current, the Vg of the first PMOS tube is close for presence and first resistor due to first resistor It is equal to its Vs, the cut-off of the first PMOS tube, and the second PMOS tube is since its Vg is sufficiently smaller than its Vs, the conducting of the second PMOS tube, by Backup power source powers to the load.
The utility model realizes main power source by the different conductings and off state of two PMOS tube and a NMOS tube Switching between backup power source, and ensure that only one power supply is in running order, it does not cause to waste, saves the energy, improve Service life;By main power source Condition Monitoring Unit, the flow direction of backup power source, the normal work of proof load are accurately controlled;It is logical Setting capacitor storage energy is crossed, momentary power failure caused by when circuit switches is avoided, guarantees that power supply steadily switches;With power supply shape State indicator light can indicate main power source state;The utility model can also access the output of main power source Condition Monitoring Unit negative The corresponding control device carried, controls the working condition of load when needed to be adapted to the power supply capacity of main power source.
Detailed description of the invention
Fig. 1 is the schematic diagram of the utility model.
Specific embodiment
The utility model is described further with reference to the accompanying drawing.
As shown in Figure 1, the power supply switch circuit of the utility model mainly include the first PMOS tube Q1, the second PMOS tube Q2, NMOS tube Q3, first resistor R1, second resistance R2 and electric capacity of voltage regulation C1.The switching device of the utility model mainly includes main power source 1, counterflow-preventing unit 2, main power source Condition Monitoring Unit 3, backup power source 4, load 5 and power supply switch circuit 6, the power supply switching Circuit 6 uses above-mentioned power supply switch circuit.
Main power source 1 is connect with counterflow-preventing unit 2, and the in the output (anode) of counterflow-preventing unit 2 and power supply switch circuit 6 The pole D of one PMOS tube Q1 connects, the associated voltage acquisition elements of main power source state detection unit 3 and the outlet line of main power source 1 The level output of connection, main power source state detection unit 3 is connect with the pole G of the second PMOS tube Q2 in power supply switch circuit 6, standby It is connect with the output of power supply 4 with the pole S of the second PMOS tube Q2 in power supply switch circuit 6, for connecting in power supply switch circuit 6 The power output end of load 5 is connect with the electric capacity of voltage regulation C1 anode in power supply switch circuit 6, main power source state detection unit 3 Level output can also access by power supply switch circuit 6 or not be directly accessed by power supply switch circuit 6 phase of load 5 It should input, main power source 1, counterflow-preventing unit 2, main power source Condition Monitoring Unit 3, backup power source 4, load 5, power supply switch circuit 6 " ground " GND all interconnect.
The pole S of first PMOS tube Q1 is connect with electric capacity of voltage regulation C1 anode, and the pole G of the first PMOS tube Q1 and first resistor R1 connect It connects, the other end of first resistor R1 is connect with electric capacity of voltage regulation C1 anode, the pole G of the first PMOS tube Q1 and the pole D of NMOS tube Q3 Connection, the pole G of NMOS tube Q3 are connect with the pole G of the second PMOS tube Q2, and the pole G of NMOS tube Q3 is also connect with second resistance R2, the The pole D of two PMOS tube Q2 is connect with electric capacity of voltage regulation C1 anode, the other end of second resistance R2, the pole S of NMOS tube Q3 and steady Voltage capacitance C1 cathode is all connected with each other with " ground " GND.
The main power source is constant voltage DC out-put supply, can include that load provides energy for whole system.
Voltage of the counterflow-preventing unit effect between isolation main power source and the pole D of the first PMOS.
The main power source detection unit is whether to reach rated value by the out-put supply of detection main power source, and export Corresponding level signal, thus to reach instruction this function of main power source state.
The backup power source effect is that system and load offer are continued as when main power source normally cannot provide the energy The energy.
Further, the main power source is power supply IC, exports stable main direct current 3.6V under normal operation.
Further, the counterflow-preventing unit can be linear voltage regulator LDO, export 3.3V.The counterflow-preventing unit can also To be isolating diode.
Further, main power source detection unit is voltage detecting IC, in main power source output end, detects the output voltage of main power source Whether 80% or more of the voltage rating of main power source is reached.If the output end voltage of main power source is normal, main power source detection unit is defeated Signal out is high level, and otherwise the signal of main power source detection unit output is reliable low level.This main power source detection simultaneously The signal of unit output utilizes for load, and different operational modes is used under different power supply status.In addition some main electricity Source is integrated with status signal output function, is consistent with this Elementary Function.
Further, the backup power source is the battery in 3.6V or so output.The backup power source is also possible to other The DC power supply of 3.6V.
Further, the power supply switch circuit, in the normal situation of main power source, the signal of main power source detection unit is controlled The pole D and the pole S of the first PMOS tube is connected, while ending the pole S and the pole D of the second PMOS tube, at this moment backup power supply does not have electric current stream To load, only main power source powering load, the energy of backup battery is saved.When main power source output abnormality, main power source detection Unit can export another signal, and the pole S and the pole D of the second PMOS tube is connected in the pole S and the pole D of control the first PMOS tube of cut-off, At this moment the energy of backup power source all flow direction loads.When main power source restores normal, the signal control of main power source detection unit is led The pole D and the pole S of logical first PMOS tube, while ending the pole S and the pole D of the second PMOS tube, at this moment restore main power source to power supply.
In addition, the effect of first resistor is in the power supply switch circuit: when main power source output abnormality, NMOS tube meeting Cut-off, the electric current of first resistor is zero, then the voltage at first resistor both ends is equal, i.e. the voltage one of the pole G and the pole S of the first PMOS It causes, at this point, the pole D and the pole S of the first PMOS tube can end.The effect of second resistance is: believing the output of main power source detection unit Number line is more stable, especially main power source exception when, reliably drag down the pole G of NMOS tube and the pole G of the second PMOS tube, make NMOS and Second PMOS tube normally in main power source exception guarantees successful switch to backup power source.The effect of capacitor is to keep circuit defeated Voltage is more stable out.
The utility model can be controlled by main power source status signal, especially accurately control the flow direction of backup power source, no It causes to waste, it is energy saving.Especially there is very big protection to as this backup power source of battery, improves service life.
The utility model is exported with power supply status indication signal, can indicate main power source state.This signal can be subject to It utilizes, different operational modes is used under different power supply status.
The utility model relates to switch operating situation are as follows:
When main power source 1 works normally, main power source state detection unit 3 can export high level.The G pole tension Vg of NMOS tube Q3 It is sufficiently more than the pole D and the conducting of the pole S of its S pole tension Vs, NMOS tube Q3.Then the G pole tension Vg of the first PMOS tube Q1 is pulled low, this When the first PMOS tube Q1 S pole tension Vs all worked normally due to main power source and backup power source, the Vs of the first PMOS tube Q1 can be protected It holds in high level level, then the Vg of the first PMOS tube Q1 is sufficiently smaller than its Vs, metal-oxide-semiconductor Q1 conducting.Meanwhile second PMOS tube Q2 by It is approximately equal to its Vs in its Vg, what the second PMOS tube Q2 was off at this time.Load 5 uses main power source 1.Due to electric capacity of voltage regulation The presence of C1, output voltage can be more stable.
There is exception when main power source 1 works, voltage can decline, and main power source state detection unit 3 exports low level.Together When, second resistance R2 can the voltage of the Vs of NMOS tube Q3 draw to zero potential GND level, at this time the Vg of NMOS tube Q3 almost etc. End in its Vs, NMOS tube Q3.Presence and first resistor R1 of the Vg of first PMOS tube Q1 due to first resistor R1 do not have at this time Electric current, the Vg of the first PMOS tube Q1 are approximately equal to its Vs, the first PMOS tube Q1 cut-off.At this moment the second PMOS tube Q2 is due to its Vg foot Enough it is less than its Vs, the second PMOS tube Q2 conducting.Load 5 uses backup power source 4.Due to the presence of electric capacity of voltage regulation C1, output Voltage can be more stable.
It should be appreciated that specific embodiment described herein is only used to explain the utility model, it is not used to limit this Utility model.
It is disclosed by the utility model it is each preferably with optional technological means, unless otherwise indicated and a preferred or optional skill Art means are that further limiting for another technological means is outer, can form several different technical solutions in any combination.

Claims (10)

1. a kind of main power source and backup power source switching circuit, it is characterised in that including the first PMOS tube, the second PMOS tube and NMOS Pipe, the pole D of first PMOS tube connect main power source incoming end, and the pole S connects power output end, the pole S of second PMOS tube Connect backup power source incoming end, the pole D connects power output end, the pole the S connection circuit of the NMOS tube, D pole connection described the The pole G of one PMOS tube, the pole G of second PMOS tube and the pole G of the NMOS tube are all connected with main power source detection level incoming end, Be connected with first resistor between the pole G and the pole S of first PMOS tube, the main power source detection level incoming end and circuit ground it Between be connected with second resistance.
2. circuit as described in claim 1, it is characterised in that be connected with pressure stabilizing electricity between the power output end and circuit ground Hold, the anode of the electric capacity of voltage regulation connects the power output end.
3. circuit as claimed in claim 1 or 2, it is characterised in that be additionally provided with main power source detection level output end, the main electricity It detects level output end and is connect with main power source detection level incoming end in source.
4. circuit as claimed in claim 1 or 2, it is characterised in that be additionally provided with power output signal port.
5. a kind of main power source and standby power switching device, it is characterised in that including main power source, backup power source, for realizing main electricity The switching circuit of source and backup power source switching and it is able to detect the main power source state detection unit of main power source output state, it is described Switching circuit uses main power source and backup power source switching circuit described in any one of claim 1-4, the main power source Output connects the main power source incoming end, and the output of the backup power source connects the backup power source incoming end, the main power source State detection unit exports high level when the output end voltage of main power source is higher than the lower threshold of setting, in the output of main power source Low level is exported when end voltage is lower than the lower threshold set, level output connects the main power source and detects level incoming end.
6. device as claimed in claim 5, it is characterised in that be equipped with counterflow-preventing between the main power source and the switching circuit Unit, the positive and negative output of the main power source are separately connected the respective input of the counterflow-preventing unit, the anti-reverse current circuit Positive output connects the main power source incoming end, and the negative output of the anti-reverse current circuit is with connecting the circuit.
7. device as claimed in claim 6, it is characterised in that the counterflow-preventing unit is using LDO linear voltage regulator or isolation two Pole pipe.
8. the device as described in claim 5,6 or 7, it is characterised in that the main power source is equipped with power management integrated circuit core Piece.
9. the device as described in claim 5,6 or 7, it is characterised in that the main power source state detection unit includes for acquiring The voltage acquisition element of main power source output voltage signal and the voltage detecting IC chip for being able to carry out voltage comparison, it is described The output of voltage acquisition element accesses the voltage detecting IC chip.
10. the device as described in claim 5,6 or 7, it is characterised in that the backup power source includes battery or battery group And it is equipped with the charge and discharge electrical switching circuit for switching the battery or battery group charge and discharge status of electrically connecting, the charge and discharge cutting The electric discharge output for changing circuit constitutes the output of the backup power source, and the charging input of the charge and discharge electrical switching circuit is equipped with external electrical Source interface.
CN201821254624.6U 2018-08-06 2018-08-06 Main power source and backup power source switching circuit and switching device Active CN208874344U (en)

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Application Number Priority Date Filing Date Title
CN201821254624.6U CN208874344U (en) 2018-08-06 2018-08-06 Main power source and backup power source switching circuit and switching device

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Application Number Priority Date Filing Date Title
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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110323830A (en) * 2019-07-19 2019-10-11 珠海格力电器股份有限公司 Power-supply switching method
CN111404254A (en) * 2020-03-30 2020-07-10 北京小米移动软件有限公司 Power supply control circuit and electronic equipment
CN111654675A (en) * 2020-06-08 2020-09-11 深圳市华宝电子科技有限公司 Vehicle-mounted video monitoring processing system and method and vehicle-mounted video monitoring system
CN112615422A (en) * 2020-12-25 2021-04-06 南京工业职业技术大学 Temporary electricity utilization system for activity site
CN115589133A (en) * 2022-12-12 2023-01-10 杰夫微电子(四川)有限公司 Power supply multiplexer and control method thereof

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110323830A (en) * 2019-07-19 2019-10-11 珠海格力电器股份有限公司 Power-supply switching method
CN110323830B (en) * 2019-07-19 2021-09-17 珠海格力电器股份有限公司 Power supply switching method
CN111404254A (en) * 2020-03-30 2020-07-10 北京小米移动软件有限公司 Power supply control circuit and electronic equipment
CN111654675A (en) * 2020-06-08 2020-09-11 深圳市华宝电子科技有限公司 Vehicle-mounted video monitoring processing system and method and vehicle-mounted video monitoring system
CN112615422A (en) * 2020-12-25 2021-04-06 南京工业职业技术大学 Temporary electricity utilization system for activity site
CN115589133A (en) * 2022-12-12 2023-01-10 杰夫微电子(四川)有限公司 Power supply multiplexer and control method thereof
CN115589133B (en) * 2022-12-12 2023-05-02 杰夫微电子(四川)有限公司 Power supply multiplexer and control method thereof

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