CN106026358A - Automatic power supply switching apparatus and method, and power supply system - Google Patents

Automatic power supply switching apparatus and method, and power supply system Download PDF

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Publication number
CN106026358A
CN106026358A CN201610465435.2A CN201610465435A CN106026358A CN 106026358 A CN106026358 A CN 106026358A CN 201610465435 A CN201610465435 A CN 201610465435A CN 106026358 A CN106026358 A CN 106026358A
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China
Prior art keywords
voltage
control signal
unit
power source
standby
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CN201610465435.2A
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Chinese (zh)
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CN106026358B (en
Inventor
朱建丰
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BOE Technology Group Co Ltd
Gaochuang Suzhou Electronics Co Ltd
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BOE Technology Group Co Ltd
K Tronics Suzhou Technology Co Ltd
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Priority to CN201610465435.2A priority Critical patent/CN106026358B/en
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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
    • 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

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  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Direct Current Feeding And Distribution (AREA)

Abstract

The invention provides an automatic power supply switching apparatus and method, and a power supply system. The automatic power supply switching apparatus comprises a judgment unit and a switching unit, wherein the judgment unit is used for judging whether the voltage value of the direct current voltage output by a main power supply unit is within a working voltage value range of a controlled electric appliance or not; and the switching unit is used for controlling the main power supply unit to supply power to the controlled electric appliance when the judgment unit judges that the voltage value of the direct current voltage is within the working voltage value range, and controlling a standby power supply unit to supply power to the controlled electric appliance when the judgment unit judges that the voltage value of the direct current voltage is out of the working voltage value range. By adoption of the automatic power supply switching apparatus, when the apparatus determines that the main power supply unit cannot supply power to the controlled electric appliance normally, the standby power supply unit can be switched to supply power to the controlled electric appliance, so that the automatic switching of the power supply can be realized.

Description

Automatic power switching device, method and electric power system
Technical field
The present invention relates to power supply automatic switchover technology field, particularly relate to a kind of automatic power switching device, side Method and electric power system.
Background technology
The electrical network of some low developed area is not sufficiently stable at present, so often facing the situation of power failure, Client's family in low developed area is substantially all and has device of solar generating, at ordinary times the electricity of solar electrical energy generation Can be stored in accumulator.When electrical network normal power supply, controlled electric appliance uses electrical network DC source to be powered, When determining electrical network DC source and can not be controlled electric appliance normal power supply, need manually to be replaced by by band crocodile The patchcord of fish folder uses accumulator direct current supply to continue to be powered to controlled electric appliance, it is impossible to realize automatically cutting Change power supply.
Summary of the invention
A kind of automatic power switching device of offer, method and electric power system are provided, solve Certainly prior art can not automatically switch when determining main power source unit and can not be controlled electric appliance normal power supply To being that controlled electric appliance is powered by standby power unit, thus asking of the automatic switchover of power supply can not be realized Topic.
In order to achieve the above object, the invention provides a kind of automatic power-supply switch, it is characterised in that Including judging unit and switch unit；
Described judging unit, is connected with main power source unit, for judging the direct current that described main power source unit exports In the range of whether the magnitude of voltage of voltage is in the operational voltage value of controlled electric appliance；
Described switch unit, respectively with described controlled electric appliance, described main power source unit and standby power unit even Connect, be in described operational voltage value model for determining the magnitude of voltage of described DC voltage when described judging unit Controlling by described main power source unit when enclosing interior is that described controlled electric appliance is powered, and when described judging unit determines Control by described stand-by power supply list when the magnitude of voltage of described DC voltage is in outside described operational voltage value scope Unit powers for described controlled electric appliance.
During enforcement, described main power source unit includes power supply adaptor；The input of described power supply adaptor and electricity Network source connects, and the outfan of described power supply adaptor is connected with described judging unit；
Described power supply adaptor is for being converted to have the first predetermined voltage by the alternating current from electric network source The DC voltage of value；
Described standby power unit includes backup DC power source, voltage judge module and DC decompression modulus of conversion Block；
Described voltage judge module, respectively with described backup DC power source, described DC decompression modular converter and Described switch unit connect, for when determine described backup DC power source output DC voltage more than or etc. By this direct voltage output to described DC decompression modular converter when threshold voltage, described standby when determining The DC voltage of DC source output less than during described threshold voltage by this direct voltage output to described switching Unit；
Described DC decompression modular converter, is connected with described switch unit, for judging from described voltage The DC voltage of the backup DC power source output of module carries out DC decompression conversion, to obtain direct current of voltage regulation Pressure, and by the output of this direct voltage of voltage regulation to described switch unit.
During enforcement, standby specifically for by from described voltage judge module of described DC decompression modular converter The DC voltage of DC source output carries out blood pressure lowering conversion, thus obtains the blood pressure lowering with the second scheduled voltage DC voltage, boosts to described decompression DC voltage afterwards, to obtain having the first scheduled voltage Direct voltage of voltage regulation, and by the output of this direct voltage of voltage regulation to described switch unit.
During enforcement, described DC decompression modular converter includes blood pressure lowering conversion chip and booster circuit；
The model of described blood pressure lowering conversion chip is TPS54821；
The PVIN1 pin of described blood pressure lowering conversion chip, is connected with described backup DC power source, is used for receiving The DC voltage of described backup DC power source output；
The V_SNS pin of described blood pressure lowering conversion chip, is connected with described booster circuit, for by described tool The decompression DC voltage having the second scheduled voltage is sent to described booster circuit.
During enforcement, described booster circuit includes the first divider resistance, the second divider resistance and electric capacity of voltage regulation；
First end ground connection of described first divider resistance, the second end of described first divider resistance and described second First end of divider resistance connects, and the second end of described second divider resistance is connected with described switch unit；
Described electric capacity of voltage regulation is in parallel with described first divider resistance；
The V_SNS pin of described blood pressure lowering conversion chip is connected with the second end of described first divider resistance.
During enforcement, described standby power unit also includes:
Polarity protection module, the DC voltage output end being connected to described backup DC power source is sentenced with described voltage Between disconnected module, carry out polarity protection for the DC voltage that described backup DC power source is exported.
During enforcement, described judging unit includes:
Comparison module, for magnitude of voltage and the reference voltage of the relatively DC voltage of described main power source unit output Magnitude of voltage, and when the magnitude of voltage of DC voltage of described main power source unit output is more than described reference voltage The first comparison signal is exported, when the magnitude of voltage of the DC voltage of described main power source unit output is less than during magnitude of voltage The second comparison signal is exported during the magnitude of voltage of described reference voltage；And,
Control signal generation module, is connected with described comparison module, for raw according to described first comparison signal Become the first main control signal and the first spare control signal, generate the second master control according to described second comparison signal Signal processed and the second spare control signal；
Described comparison module includes that comparison signal outfan, described first comparison signal and described second compare letter Number all exported by described comparison signal outfan；
Described control signal generation module includes main control signal outfan and spare control signal outfan；Institute State the first main control signal and described second main control signal is all exported by described main control signal outfan, institute State the first spare control signal and described second spare control signal all by described spare control signal outfan Output；
Described switch unit includes main control circuit and standby control circuit；
Described main control circuit, be connected to described main power source unit and described controlled electric appliance power input it Between, for turning on described main power source when described control signal generation module generates the first main control signal time control system Connection between unit and described power input, when described control signal generation module generates the second main control Control during signal to disconnect the connection between described main power source unit and described power input；
Described standby control circuit, is connected to the power supply input of described standby power unit and described controlled electric appliance Between end, described for controlling disconnection when described control signal generation module generates the first spare control signal Connection between standby power unit and described power input, when described control signal generation module generates the Two spare control signal time control systems turn on the connection between described standby power unit and described power input.
During enforcement, described control signal generation module also includes:
Spare control signal generative circuit, respectively with described comparison signal outfan, reference voltage output end and Described spare control signal outfan connects, for controlling when described comparison module exports the first comparison signal Described spare control signal outfan exports the first spare control signal, when described comparison module output the second ratio Relatively control described spare control signal outfan during signal and export the second spare control signal；And,
Main control signal generative circuit, defeated with described reference voltage output end, described spare control signal respectively Go out end and described main control signal outfan connects, for exporting first when described spare control signal outfan Spare control signal controls described main control signal outfan and exports the first main control signal, when described standby control Signal output part processed controls described main control signal outfan output second when exporting the second spare control signal Main control signal.
During enforcement, described first comparison signal is the first level, and described second comparison signal is second electrical level；
Described spare control signal generative circuit include the first standby control resistance, standby control transistor, Two standby control resistance and the 3rd standby control resistance；
First end of described first standby control resistance is connected with described comparison signal outfan, described first standby It is connected with the grid of described standby control transistor with the second end controlling resistance；
First pole of described first standby control transistor is by described second standby control resistance and described base Quasi-voltage output end connects, and the first pole of described first standby control transistor is also by described 3rd standby control Resistance processed is connected with described spare control signal outfan；Second pole of described first standby control transistor with Second electrical level outfan connects；
Described main control signal generative circuit includes main control resistance and main control transistor；
The grid of described main control transistor is connected with described spare control signal outfan, described master control combinations First pole of body pipe is connected with described main control signal outfan, the second pole of described main control transistor and the Two level output ends connect；
Described main control resistance be connected to described reference voltage output end and described main control signal outfan it Between.
During enforcement, described main control circuit includes that the first relay, described standby control circuit include that second continues Electrical equipment；
The control end of described first relay is connected with described main control signal outfan, described first relay Input be connected with described main power source unit, the outfan of described first relay and described controlled electric appliance Power input connects；
The control end of described second relay is connected with described spare control signal outfan, described second relay The input of device is connected with described standby power unit, the outfan of described second relay and described controlled electricity The power input of device connects.
During enforcement, described judging unit also includes: reference voltage generation module, respectively with described main power source list First and described standby power unit connects, for the DC voltage and described according to the output of described main power source unit The DC voltage of standby power unit output generates described reference voltage；
Described reference voltage generation module includes reference voltage output end, the first divider resistance, the second dividing potential drop electricity Resistance, the 3rd divider resistance, the 4th divider resistance and dividing potential drop diode；
The anode of described dividing potential drop diode is connected with described standby power unit by described 3rd divider resistance, The anode of described dividing potential drop diode is also by described 4th divider resistance ground connection；
The negative electrode of described dividing potential drop diode is connected with described main power source unit by described first divider resistance, institute Stating the negative electrode of dividing potential drop diode also by described second divider resistance ground connection, the negative electrode of described dividing potential drop diode is also It is connected with described reference voltage output end.
Present invention also offers a kind of power supply automatic switching method, be applied to above-mentioned power supply automatic switchover dress Putting, described power supply automatic switching method includes:
Judge step: judging unit judge the magnitude of voltage of the DC voltage that main power source unit exports whether be in by In the range of the operational voltage value of control electrical equipment；
Switch step: be in described work electricity when described judging unit determines the magnitude of voltage of described DC voltage Time in the range of pressure value, it is that described controlled electric appliance is powered that described switch unit controls by described main power source unit；When Described judging unit determine the magnitude of voltage of described DC voltage be in described operational voltage value scope outer time, institute State switch unit and control by described standby power unit to be that described controlled electric appliance is powered.
During enforcement, when described standby power unit includes backup DC power source, voltage judge module and direct current fall During pressure modular converter, it is that described controlled electric appliance is powered step that described switch unit controls by described standby power unit Suddenly include:
Described backup DC power source output DC voltage；
When described voltage judge module determine described backup DC power source output DC voltage more than or etc. When described threshold voltage, this direct voltage output to described DC decompression is changed by described voltage judge module Module, the backup DC power source from described voltage judge module is exported by described DC decompression modular converter DC voltage carries out DC decompression conversion, to obtain direct voltage of voltage regulation, and is exported by this direct voltage of voltage regulation To described switch unit；
When described voltage judge module determines the DC voltage of described backup DC power source output less than described During threshold voltage, described voltage judge module is by this direct voltage output to described switch unit；Described switching Unit controls the direct voltage output after this voltage stabilizing to controlled electric appliance, thinks that described controlled electric appliance is powered；
And/or,
When described standby power unit also includes polarity protection module, described switch unit controls by described standby It is that described controlled electric appliance energizing step also includes with power subsystem:
The DC voltage that described backup DC power source is exported by polarity protection module carries out polarity protection, afterwards will This direct voltage output is to described voltage judge module.
During enforcement, when described judging unit includes comparison module and control signal generation module, described switching list When unit includes main control circuit and standby control circuit,
Described judgement step includes:
The magnitude of voltage of the DC voltage of described comparison module more described main power source unit output and reference voltage Magnitude of voltage, and when the magnitude of voltage of DC voltage of described main power source unit output is more than described reference voltage The first comparison signal is exported, when the magnitude of voltage of the DC voltage of described main power source unit output is less than during magnitude of voltage The second comparison signal is exported during the magnitude of voltage of described reference voltage；
Described control signal generation module generates the first main control signal and according to described first comparison signal One spare control signal, generates the second main control signal and the second standby control according to described second comparison signal Signal；
Described switch step includes:
When described control signal generation module generates the first main control signal, described master control circuit controls is led Logical connection between described main power source unit and described power input, when described control signal generation module is raw The second the most described master control circuit controls of main control signal is become to disconnect described main power source unit and described power supply Connection between input；
The described standby control circuit control when described control signal generation module generates the first spare control signal System disconnects the connection between described standby power unit and described power input, when described control signal generates Module generates described standby control circuit during the second spare control signal and controls to turn on described standby power unit And the connection between described power input.
Present invention also offers a kind of electric power system, including main power source unit, standby power unit and above-mentioned Automatic power-supply switch.
Compared with prior art, automatic power switching device of the present invention, method and electric power system are passed through Judging unit judges that main power source unit the most normally works, and can not be for controlled electricity when determining main power source unit During device normal power supply, switch unit control to switch to standby power unit to be that controlled electric appliance is powered；The present invention Automatic power-supply switch described in embodiment can accomplish to determine main power source unit can not be for controlled electricity Automatically switching to during device normal power supply by standby power unit is that controlled electric appliance is powered such that it is able to realize power supply The automatic switchover of power supply.
Accompanying drawing explanation
Fig. 1 is the structured flowchart of the automatic power-supply switch described in the embodiment of the present invention；
Fig. 2 is the structured flowchart of the automatic power-supply switch described in another embodiment of the present invention；
Fig. 3 is the structured flowchart of the automatic power-supply switch described in further embodiment of this invention；
Fig. 4 is the electricity of the voltage judge module that the automatic power-supply switch described in the embodiment of the present invention includes Lu Tu；
Fig. 5 is a tool of the DC decompression modular converter that automatic power-supply switch of the present invention includes The circuit diagram of body embodiment；
Fig. 6 is that one of the backup DC power source in automatic power-supply switch of the present invention is embodied as The structural representation of example；
Fig. 7 is to set between accumulator DC pressure outfan J2 and DC voltage input end B_12V_IN It is equipped with the schematic diagram of polarity protection diode D1；
Fig. 8 is the structured flowchart of the automatic power-supply switch described in another embodiment of the present invention；
Fig. 9 is a specific embodiment of the switch unit that automatic power-supply switch of the present invention includes Circuit diagram；
Figure 10 is the schematic diagram of two relays that automatic power-supply switch of the present invention includes；
Figure 11 is the circuit of the reference voltage generation module that automatic power-supply switch of the present invention includes Figure；
Figure 12 is the structural representation of a specific embodiment of automatic power-supply switch of the present invention；
Figure 13 is the flow chart of the power supply automatic switching method described in the embodiment of the present invention.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clearly Chu, be fully described by, it is clear that described embodiment be only a part of embodiment of the present invention rather than Whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art are not making creation The every other embodiment obtained under property work premise, broadly falls into the scope of protection of the invention.
As it is shown in figure 1, the automatic power-supply switch described in the embodiment of the present invention includes judging unit and switching Unit；
Described judging unit 11, is connected with main power source unit 101, is used for judging described main power source unit 101 In the range of whether the magnitude of voltage of the DC voltage of output is in the operational voltage value of controlled electric appliance 100；
Described switch unit 12, respectively with described controlled electric appliance 100, described main power source unit 101 and standby Power subsystem 102 connects, for determining at the magnitude of voltage of described DC voltage when described judging unit 11 Controlling by described main power source unit 101 time in the range of described operational voltage value is described controlled electric appliance 100 Power supply, and the magnitude of voltage determining described DC voltage when described judging unit 11 is in described running voltage Control when value scope is outer to be powered for described controlled electric appliance 100 by described standby power unit 102.
By judging unit, automatic power-supply switch described in the embodiment of the present invention judges that main power source unit is No normal work, and when determining main power source unit and can not be controlled electric appliance normal power supply, by switch unit Controlling to switch to standby power unit is that controlled electric appliance is powered；Power supply described in the embodiment of the present invention automatically switches Device can accomplish when determine main power source unit can not for controlled electric appliance normal power supply time automatically switch to by Standby power unit is that controlled electric appliance is powered such that it is able to realize the automatic switchover of power supply.
When practical operation, described main power source unit can be electrical network power supply unit, described standby power unit It can be accumulator.
Concrete, as in figure 2 it is shown, described main power source unit 101 can include power supply adaptor 1011； The input of described power supply adaptor 1011 is connected with electric network source Pg, the outfan of described power supply adaptor It is connected with described judging unit 11；
Described power supply adaptor 1011 is pre-for the alternating current from electric network source Pg is converted to have first Determine the DC voltage of magnitude of voltage；
That is, main power source unit includes the power supply adaptor being connected with electric network source.
Concrete, as it is shown on figure 3, described standby power unit 102 include backup DC power source 1021, Voltage judge module 1022 and DC decompression modular converter 1023；
Described voltage judge module 1022, respectively with described backup DC power source 1021, described DC decompression Modular converter 1023 and described switch unit 12 connect, for when determining described backup DC power source 1021 This direct voltage output to described DC decompression is turned by the DC voltage of output more than or equal to during threshold voltage Die change block 1023, when determining the DC voltage of described backup DC power source 1021 output less than described threshold value By this direct voltage output to described switch unit 12 during voltage；
Described DC decompression modular converter 1023, is connected with described switch unit 12, for from described The DC voltage of backup DC power source 1021 output of voltage judge module 1022 carries out DC decompression conversion, To obtain direct voltage of voltage regulation, and by the output of this direct voltage of voltage regulation to described switch unit 12；
Automatic power-supply switch described in the embodiment of the present invention passes through the standby direct current of voltage judge module 1022 When the DC voltage of power supply output is more than threshold voltage, by this DC voltage through DC decompression modular converter 1023 carry out DC decompression conversion, the magnitude of voltage being possible to prevent this DC voltage higher thus cause controlled The circuit of electrical equipment is burned out.
According to a kind of detailed description of the invention, described backup DC power source 1021 can be accumulator.
Concrete, as shown in Figure 4, described voltage judge module includes: the first divider resistance R41, second Divider resistance R42, control audion TC, control relay K V0 and earth resistance R43；
Described voltage judge module is defeated with DC voltage input end B_12V_IN and direct voltage of voltage regulation respectively Go out and hold B_12V_OUT to connect；
First end of R41 is connected with B_12V_IN, and second end of R41 is connected with first end of R42；
The second end ground connection of R42；
Second end of R41 is also connected with the base stage of TC；
The colelctor electrode of TC is connected with the EN pin of KV0, and the emitter stage of TC is connect by earth resistance R43 Ground；
In the embodiment shown in fig. 4, set threshold voltage is 12.8V, to meet the 10 of 12V The requirement of bias voltage；
When the DC voltage inputted by B_12V_IN is less than 12.8V, Vbe (base stage and the transmitting of TC Voltage difference between pole) less than conducting voltage, TC turns on, the enable signal that the EN pin of KV0 accesses Being defaulted as high level, KV0 turns on, B_12_IN the DC voltage inputted is directly output to B_12V_OUT；
When by the DC voltage inputted by B_12V_IN more than or equal to 12.8V, the Vbe (base of TC Voltage difference between pole and emitter stage) more than or equal to conducting voltage, TC turns on, the EN pin of KV0 The enable signal accessed is pulled low as low level, and KV0 is not turned on, B_12_IN the DC voltage inputted After carrying out DC decompression conversion by DC decompression modular converter, output direct current of voltage regulation is depressed into B_12_OUT。
In the diagram, be additionally provided with the first voltage judge resistance RJ1, the second voltage judge resistance RJ2, One voltage judges that electric capacity CJ1 and the second voltage judge electric capacity CJ2.
When practical operation, described DC decompression modular converter is specifically for will be from described voltage judge module The DC voltage of backup DC power source output carry out blood pressure lowering conversion, thus obtain that there is the second scheduled voltage Decompression DC voltage, afterwards described decompression DC voltage is boosted, to obtain having the first predetermined electricity The direct voltage of voltage regulation of pressure value, and by the output of this direct voltage of voltage regulation to described switch unit.
Concrete, described DC decompression modular converter can include blood pressure lowering conversion chip and booster circuit；
The model of described blood pressure lowering conversion chip is TPS54821；
The PVIN1 pin of described blood pressure lowering conversion chip, is connected with described backup DC power source, is used for receiving The DC voltage of described backup DC power source output；
The V_SNS pin of described blood pressure lowering conversion chip, is connected with described booster circuit, for by described tool The decompression DC voltage having the second scheduled voltage is sent to described booster circuit.
Concrete, described booster circuit can include the first divider resistance, the second divider resistance and electric capacity of voltage regulation；
First end ground connection of described first divider resistance, the second end of described first divider resistance and described second First end of divider resistance connects, and the second end of described second divider resistance is connected with described switch unit；
Described electric capacity of voltage regulation is in parallel with described first divider resistance；
The V_SNS pin of described blood pressure lowering conversion chip is connected with the second end of described first divider resistance.
Below by a concrete circuit diagram, the automatic power-supply switch described in the embodiment of the present invention is described In DC decompression modular converter.
As it is shown in figure 5, in a specific embodiment of described DC decompression modular converter, described DC decompression Modular converter includes blood pressure lowering conversion chip U1 and the booster circuit that model is TPS54821；
The PVIN1 pin of described blood pressure lowering conversion chip U1, is connected with described backup DC power source 1021, For receiving the DC voltage of described backup DC power source 1021 output；
The V_SNS pin of described blood pressure lowering conversion chip U1, is connected with described booster circuit 42, and being used for will The decompression DC voltage with the second scheduled voltage is sent to described booster circuit 42；
Described booster circuit includes the first divider resistance Rf1, the second divider resistance Rf2 and electric capacity of voltage regulation Cw；
The first end ground connection of described first divider resistance Rf1, second end of described first divider resistance Rf1 with First end of described second divider resistance Rf2 connects, and second end of described second divider resistance Rf2 is by steady Pressure DC voltage output end B_12V_OUT is connected with described switch unit (not shown in Fig. 5)；
Described electric capacity of voltage regulation Cw is in parallel with described second divider resistance Rf2；
The V_SNS pin of described blood pressure lowering conversion chip is connected with second end of described first divider resistance Rf1.
In Figure 5, second end of described second divider resistance Rf2 and described direct voltage of voltage regulation outfan Being also associated with voltage regulation resistance Rw between B_12V_OUT, the resistance of this voltage regulation resistance Rw can be 0 Europe, The resistance of described first divider resistance Rf1 can be 1k Europe, and the resistance of described second divider resistance Rf1 can Think 19k Europe；
In the present embodiment, the rated value of the DC voltage of described backup DC power source 1021 output is 12V, The DC voltage of this backup DC power source 1021 output is inputted extremely by DC voltage input end B_12V_IN The PVIN1 pin of described blood pressure lowering conversion chip U1；
It addition, described blood pressure lowering conversion chip U1 also includes RT/CLK pin (pin 1), two GND Pin (respectively pin 2 and pin 3), PVIN2 pin (pin 5), VIN pin (pin 6), PWPD pin (pin 15), PWRGD pin (pin 14), BOOT pin (pin 13), PH2 pin (pin 12), PH1 pin (pin 11), EN pin (pin 10), SS/TR pin (pin 9) and COMP pin (pin 8)；
PVIN1 pin above-mentioned is pin 4, and V_SNS pin is pin 7；
Further, the specific embodiment of the DC decompression modular converter shown in Fig. 5 also includes:
First resistance R1, the first end is connected with the RT/CLK pin of U1, the second end ground connection；
First electric capacity C1, the first end is connected with described DC voltage input end B_12V_IN, the second termination Ground；
Second resistance R2, the first end is connected with PVIN1 pin, the second end and enable working signal outfan EN_U1 connects；
3rd resistance R3, the first end is connected with second end of described second resistance R2, the second end ground connection；
Second resistance C2, the first end is connected with first end of described second resistance R2, the second end ground connection；
4th resistance R4, the first end is connected with the COMP pin of U1；
3rd electric capacity C3, the first end is connected with second end of described 4th resistance R4, the second end ground connection；
4th electric capacity C4, the first end is connected with the COMP pin of U1, the second end ground connection；
5th electric capacity C5, the first end is connected with the SS/TR pin of U1, the second end ground connection；
6th electric capacity C6, the first end is connected with the BOOT pin of U1, and the second end draws with the PH2 of U1 Foot connects；
First inductance L1, the first end is connected with second end of described 6th electric capacity C6, and the second end is straight with voltage stabilizing Stream voltage output end B_12V_OUT connects；
7th electric capacity C7, the first end is connected with direct voltage of voltage regulation outfan B_12V_OUT, the second end Ground connection；
8th electric capacity C8, the first end is connected with direct voltage of voltage regulation outfan B_12V_OUT, the second end Ground connection；
5th resistance R5, is connected between PWRGD pin and DC voltage input end B_12V_IN；
The EN pin of U1 is also connected with enable working signal outfan EN_U1；
Second end of R1 is connected with two GND pin of U1 the most respectively；
The PVIN1 pin of U1 is connected with the PVIN2 pin of U1 and the VIN pin of U1 the most respectively；
Second end of C6 is connected with the PH2 pin of U1 and the PH1 pin of U1 the most respectively.
Operationally, the PVIN1 pin of U1 accesses present invention DC decompression modular converter as shown in Figure 5 The DC voltage that described backup DC power source 1021 is inputted by B_12V_IN, U1 passes through its V_SNS Pin output voltage value is the decompression DC voltage of 0.6V, and then this decompression DC voltage passes through booster circuit The boosted direct voltage output for 12V to direct voltage of voltage regulation outfan B_12V_OUT, such that it is able to Make the supply voltage voltage stabilizing of standby power unit at 12V, prevent due to the voltage of backup DC power source output Higher and cause the circuit of controlled electric appliance to burn.
In Figure 5, EN_U1 provides for U1 and enables working signal, and when practical operation, EN_U1 can To export 12V running voltage.Preferably, described standby power unit also includes:
Polarity protection module, is connected to the DC voltage output end of described backup DC power source and described voltage ratio Between relatively module, carry out polarity protection, with to standby for the DC voltage that described backup DC power source is exported Carry out polarity protection with the DC voltage of DC source output, prevent the positive pole of backup DC power source and negative pole from connecing Anti-thus the line fault that causes.
Concrete, described polarity protection module can include protecting diode；
The anode of described protection diode is connected with the DC voltage output end of described backup DC power source, described The negative electrode of protection diode is connected with described mu balanced circuit.
Concrete, as shown in Figure 6, when described backup DC power source include accumulator (not showing in Fig. 6) and During alligator clamp conversion line 61,
The positive pole of described accumulator is connected with the positive input terminal 611 of described alligator clamp conversion line 61, described storage The negative pole of battery is connected with the negative input end 612 of described alligator clamp conversion line 61, described alligator clamp conversion line The DC voltage output end that outfan 613 is described backup DC power source of 61.
When practical operation, when using storage battery power supply, client directly uses alligator clamp patchcord 61 even Connect accumulator positive negative electrode, the positive input terminal 611 (i.e. red clip) of alligator clamp patchcord 61 is connect storage Anode, connects battery terminal negative by the negative input end 612 (i.e. black clip) of alligator clamp patchcord 61, The outfan 613 of alligator clamp patchcord connects DC (DC source is powered) interface of board (in Fig. 7 not Show), thus power to board and make board normally work.
Preferably, as it is shown in fig. 7, press outfan J2 and DC voltage input end at accumulator DC Polarity protection diode D1 it is provided with between B_12V_IN；
The anode of D1 is connected with accumulator DC pressure outfan J2, and the negative electrode of D1 inputs with DC voltage End B_12V_IN connects.
Concrete, as shown in Figure 8, described judging unit 11 may include that
Comparison module 111, for the output of relatively described main power source unit 101 DC voltage magnitude of voltage and The magnitude of voltage of reference voltage V adj, and the magnitude of voltage of the DC voltage when the output of described main power source unit 101 The first comparison signal is exported, when described main power source unit 101 during more than the magnitude of voltage of described reference voltage V adj When the magnitude of voltage of the DC voltage of output is less than the magnitude of voltage of described reference voltage V adj, letter is compared in output second Number；And,
Control signal generation module 112, is connected with described comparison module 111, for comparing according to described first Relatively signal generates the first main control signal and the first spare control signal, generates according to described second comparison signal Second main control signal and the second spare control signal；
Described comparison module 111 includes comparison signal outfan SD, described first comparison signal and described Two comparison signals are all exported by described comparison signal outfan SD；
Described control signal generation module 112 includes main control signal outfan EN1 and spare control signal Outfan EN2；Described first main control signal and described second main control signal are all by described main control signal Outfan EN1 exports, and described first spare control signal and described second spare control signal are all by described Spare control signal outfan EN2 exports；
Described switch unit 12 includes main control circuit 121 and standby control circuit 122；
Described main control circuit 121, is connected to described main power source unit 101 and described controlled electric appliance 100 Between power input (this power input does not shows in fig. 8), for generating mould when described control signal Block 112 generates the first main control signal time control system and turns on described main power source unit 101 and described controlled electric appliance Connection between the power input of 100, when described control signal generation module 112 generates the second main control Control during signal to disconnect between described main power source unit 101 and the power input of described controlled electric appliance 100 Connect；
Described standby control circuit 122, is connected to described standby power unit 102 and described controlled electric appliance 100 Power input between, for generating the first spare control signal when described control signal generation module 112 Time control to disconnect the company between described standby power unit 102 and the power input of described controlled electric appliance 100 Connect, turn on described standby when described control signal generation module 112 generates the second spare control signal time control system Connection between power subsystem 102 and described power input.
In the automatic power-supply switch described in the embodiment of the present invention, it is judged that unit includes comparison module and control Signal generation module processed, comparison module is by comparing magnitude of voltage and the base of the DC voltage of main power source unit output The magnitude of voltage of quasi-voltage, the most normal to judge the DC voltage that main power source unit exports, and control signal is raw Becoming module to generate corresponding control signal according to comparative result, described switch unit includes main control circuit and standby By control circuit, control accordingly according to corresponding control signal by main power source unit or standby power unit be Controlled electric appliance is powered.
Concrete, described control signal generation module also includes:
Spare control signal generative circuit, respectively with described comparison signal outfan, reference voltage output end and Described spare control signal outfan connects, for controlling when described comparison module exports the first comparison signal Described spare control signal outfan exports the first spare control signal, when described comparison module output the second ratio Relatively control described spare control signal outfan during signal and export the second spare control signal；And,
Main control signal generative circuit, defeated with described reference voltage output end, described spare control signal respectively Go out end and described main control signal outfan connects, for exporting first when described spare control signal outfan Spare control signal controls described main control signal outfan and exports the first main control signal, when described standby control Signal output part processed controls described main control signal outfan output second when exporting the second spare control signal Main control signal；
Described reference voltage output end output reference voltage Vadj.
Concrete, described first comparison signal is the first level, and described second comparison signal is second electrical level；
Described spare control signal generative circuit include the first standby control resistance, standby control transistor, Two standby control resistance and the 3rd standby control resistance；
First end of described first standby control resistance is connected with described comparison signal outfan, described first standby It is connected with the grid of described standby control transistor with the second end controlling resistance；
First pole of described first standby control transistor is by described second standby control resistance and described base Quasi-voltage output end connects, and the first pole of described first standby control transistor is also by described 3rd standby control Resistance processed is connected with described spare control signal outfan；Second pole of described first standby control transistor with Second electrical level outfan connects；
Described main control signal generative circuit includes main control resistance and main control transistor；
The grid of described main control transistor is connected with described spare control signal outfan, described master control combinations First pole of body pipe is connected with described main control signal outfan, the second pole of described main control transistor and the Two level output ends connect；
Described main control resistance be connected to described reference voltage output end and described main control signal outfan it Between.
According to a kind of detailed description of the invention, as it is shown in figure 9, described first comparison signal can be high level, Described second comparison signal can be low level；
Described spare control signal generative circuit 1121 includes the first standby control resistance Rb1, standby control Transistor Tb, the second standby control resistance Rb2 and the 3rd standby control resistance Rb3；
First end of described first standby control resistance Rb1 is connected with described comparison signal outfan SD, institute The grid of the second end and described standby control transistor Tb of stating the first standby control resistance Rb1 is connected；
First pole of described first standby control transistor Tb by described second standby control resistance Rb2 with Described reference voltage output end connects, and first pole of described first standby control transistor Tb1 is also by institute State the 3rd standby control resistance Rb3 to be connected with described spare control signal outfan EN2；Described first standby With the second pole ground connection controlling transistor Tb；
Described main control signal generative circuit 1122 includes main control resistance Rz and main control transistor Tz；
The grid of described main control transistor Tz is connected with described spare control signal outfan EN2, described First pole of main control transistor Tz is connected with described main control signal outfan EN2, described master control combinations The second pole ground connection of body pipe Tz；
Described main control resistance Rz is connected to described reference voltage output end and described main control signal outfan Between EN1；
Described reference voltage output end output reference voltage Vadj.
Output is by the comparator chip U2 in Figure 10 to the comparison signal of described comparison signal outfan SD OUTA pin output；
The model of comparator chip U2 is LM393 or LM193；
The A+ pin of comparator chip U2 is by the first resistance R1 and main power source unit (not showing in Figure 10) DC voltage output end A_12V_OUT connect；
The A-pin of comparator chip U2 is connected with described reference voltage output end by the second resistance R2；
The GND pin ground connection of comparator chip U2；
The VCC pin of comparator chip U2 is by the 3rd resistance R3 with described reference voltage output end even Connect；
The voltage accessed when the A+ pin of comparator chip U2 connects more than the A-pin of comparator chip U2 During the voltage entered, the OUTA pin output high level of comparator chip U2 is to SD, namely works as main power source When the DC voltage of unit output is more than reference voltage, comparison signal is high level；
The voltage accessed when the A+ pin of comparator chip U2 connects less than the A-pin of comparator chip U2 During the voltage entered, the OUTA pin output low level of comparator chip U2 is to SD, namely works as main power source When the DC voltage of unit output is less than reference voltage, comparison signal is low level.
In fig .9, Tb and Tz is audion, but during practical operation, Tb and Tz can also be other The switching tube of type, the value of the first comparison signal and the second comparison signal can also change, not by more than Value limited.
Present invention automatic power-supply switch as shown in Figure 9 operationally, when comparison signal is high level Time, Tb turns on, EN2 output low level, and Tz disconnects, and EN1 exports high level；
When comparison signal is low level, Tb disconnects, and EN2 exports high level, and Tz turns on, and EN1 exports Low level.
Concrete, in fig .9, the resistance of Rz, the resistance of Rb2 and the resistance of R3 can be all 4.7k Europe；The resistance of the resistance of R1, the resistance of R2, the resistance of Rb1 and Rb2 can be all 22 Europe；But Above resistance is chosen and is only used for citing, and is not construed as limiting；
Comparator chip U2 also includes OUTB pin, B+ pin and B-pin；
The pin that OUTA pin is U2 1 of U2, the pin that A-pin is U2 2 of U2, U2's A+ pin is the pin 3 of U2, and the GND pin of U2 is the pin 4 of U2, and the B+ pin of U2 is U2 Pin 5, the pin that B-pin is U2 6 of U2, the pin that OUTB pin is U2 7 of U2, The VCC pin of U2 is the pin 8 of U2.
Concrete, as shown in Figure 10, described main control circuit includes the first relay K V1, described standby Control circuit includes the second relay K V2；
The control end of described first relay K V1 is connected with described main control signal outfan EN1, described The input of the first relay K V1 and the DC voltage output end of described main power source unit 101 A_12V_OUT connects, and the outfan of described first relay K V1 passes through the first of the first adapter J1 Terminal is connected with the power input (not shown in Figure 10) of described controlled electric appliance；
The control end of described second relay K V2 is connected with described spare control signal outfan EN2, institute State the input of the second relay K V2 and the DC voltage output end of described standby power unit B_12V_OUT connects, the outfan of described second relay by second terminal of the first adapter J1 with The power input of described controlled electric appliance connects.
In such as the embodiment of Figure 10, main control circuit and standby control circuit include a relay respectively, By main control signal control KV1 whether turn on A_12V_OUT and controlled electric appliance power input it Between connection, control whether KV2 turns on B_12V_OUT and controlled electric appliance by spare control signal Connection between power input.
In Fig. 10, between the outfan and second terminal of J4 of KV2, it is also associated with a connector J3.
In Fig. 10, KV1 controls the EN pin that end is KV1, and the input of KV1 is KV1's IN pin, the outfan of KV1 is the OUT pin of KV1, two GND pin all ground connection of KV1.
Concrete, in the automatic power-supply switch described in the embodiment of the present invention, described judging unit is permissible Also include: reference voltage generation module, be connected with described main power source unit and described standby power unit respectively, The unidirectional current exported for the DC voltage exported according to described main power source unit and described standby power unit Pressure generates described reference voltage.
Automatic power-supply switch described in the embodiment of the present invention uses reference voltage generation module according to main electricity Source unit output DC voltage and standby power unit output DC voltage generate reference voltage, so when During the DC voltage exception that the DC voltage of main power source unit output or standby power unit export, this benchmark electricity Pressure generation module still can output voltage values reference voltage in preset range.
As shown in figure 11, concrete, described reference voltage generation module can include reference voltage output end, First divider resistance R1, the second divider resistance R2, the 3rd divider resistance R3, the 4th divider resistance R4 and Dividing potential drop diode D2；
The anode of described dividing potential drop diode D2 is by described 3rd divider resistance R3 and described stand-by power supply list The DC voltage output end B_12V_OUT of unit connects, and the anode of described dividing potential drop diode D2 is also by institute State the 4th divider resistance R4 ground connection；
The negative electrode of described dividing potential drop diode D2 is by described first divider resistance R1 and described main power source unit DC voltage output end A_12V_OUT connect, the negative electrode of described dividing potential drop diode D2 is also by described Second divider resistance R2 ground connection, the negative electrode of described dividing potential drop diode D2 also with described reference voltage output end Connect；
Described reference voltage output end output reference voltage Vadj.
In the embodiment shown in fig. 11, the resistance of R1 can be 4.7k Europe, the resistance of R2, the resistance of R3 The resistance of value and R4 can be all 10k Europe.
Present invention embodiment as shown in figure 11 operationally, when A_12V_OUT output DC voltage Time abnormal, it is assumed that now this DC voltage be 6V and time the DC voltage of B_12V_OUT output is 12V, The anode potential of D2 turns on higher than the cathode potential of D2, D2, therefore the current potential of Vadj and B_12V_OUT The DC voltage of output is relevant, when the DC voltage of A_12V_OUT output is also 12V, and the moon of D2 The electrode potential anode potential higher than D2, D2 disconnects, the most now Vadj Yu A_12V_OUT output DC voltage is relevant.
Below by a specific embodiment, automatic power-supply switch of the present invention is described.
In specific embodiment as shown in figure 12, backup DC power source is accumulator, and accumulator output is straight Stream voltage S2 (this DC voltage is 12V) first passes through polarity fool proof circuit, prevents alligator clamp patchcord Occur when connecting accumulator that the circuit that polarity connection occurs on the contrary damages, be then passed through DC decompression modular converter, Make the DC voltage stability that accumulator exports less than 12V；
The DC voltage of adapter output DC voltage S1 and the output of DC decompression modular converter is turned by power supply Output reference voltage Vadj (Vadj is between 4V-8V) after thread-changing road, then by this reference voltage V adj Export to comparator chip LM393；
Adapter output DC voltage S1 also exports to comparator chip LM393；
Power conversion circuit is that LM393 powers；
LM393 compares adapter output DC voltage S1 and Vadj, if adapter output DC voltage S1 Export high level more than Vadj then LM393, control circuit with control signal and make main control signal outfan EN1 (EN1 controls the first relay K V1) output high level and spare control signal outfan EN2 (EN2 Control the second relay K V2) output low level, after being delayed by several seconds, corresponding KV1 turns on, KV2 Cut-off, adapter output DC voltage S1 conduct after polarity fool proof circuit and DC decompression modular converter Output voltage S3, thinks that controlled electric appliance (not shown in Figure 12) is powered；
LM393 compares adapter output DC voltage S1 and Vadj, if adapter output DC voltage S1 Less than Vadj then LM393 output low level, control circuit with control signal and make main control signal outfan EN1 (EN1 controls the first relay K V1) output low level and spare control signal outfan EN2 (EN2 Control the second relay K V2) output high level, after being delayed by several seconds, corresponding KV2 turns on, KV1 Cut-off, accumulator output DC voltage S2 conduct after polarity fool proof circuit and DC decompression modular converter Output voltage S3, thinks that controlled electric appliance (not shown in Figure 12) is powered.
This specific embodiment of automatic power-supply switch of the present invention passes through voltage stabilizing circuit by accumulator The DC voltage stability of output, at 12V, is converted to reference voltage by power conversion circuit, by adapter Output DC voltage and reference voltage compare, so that LM393 (master control IC (Integrated Circuit, integrated circuit)) output comparison signal, export corresponding control signal by signal control line road To main control signal outfan EN1 and spare control signal outfan EN2, to control the first relay K V1 With being turned on and off of the second relay K V2 so that output voltage S3 exports unidirectional current at adapter Automatically switch between pressure and accumulator output DC voltage.
Automatic power-supply switch described in the embodiment of the present invention uses Novel DC voltage voltage stabilizing handoff technique, (described controlled electric appliance can be such as the TV (TV) or monitor of client so that controlled electric appliance (board)) power supply can be powered by adapter after the several seconds that has a power failure automatically switches to accumulator direct current supply Power supply, and has polarity protection and voltage stabilizing for storage battery power supply, supply voltage voltage stabilizing 12V (or 19V, or other predetermined direct current voltages), the magnitude of voltage of DC voltage preventing output is higher and causes panel Circuit burns. and after restoring electricity, again can switch back within the several seconds again by adapter is that controlled electric appliance supplies Electricity.
As shown in figure 13, the power supply automatic switching method described in the embodiment of the present invention, it is applied to above-mentioned electricity Source automatic switching control equipment, described power supply automatic switching method includes:
Judge step S1: judging unit judges whether the magnitude of voltage of the DC voltage that main power source unit exports is located In the range of the operational voltage value of controlled electric appliance；
Switch step S2: be in described work when described judging unit determines the magnitude of voltage of described DC voltage When making in range of voltage values, it is that described controlled electric appliance supplies that described switch unit controls by described main power source unit Electricity；It is in outside described operational voltage value scope when described judging unit determines the magnitude of voltage of described DC voltage Time, it is that described controlled electric appliance is powered that described switch unit controls by described standby power unit.
By judging unit, power supply automatic switching method described in the embodiment of the present invention judges that main power source unit is No normal work, and when determining main power source unit and can not be controlled electric appliance normal power supply, by switch unit Controlling to switch to standby power unit is that controlled electric appliance is powered；Power supply described in the embodiment of the present invention automatically switches Method can accomplish when determine main power source unit can not for controlled electric appliance normal power supply time automatically switch to by Standby power unit is that controlled electric appliance is powered such that it is able to realize the automatic switchover of power supply.
Concrete, when described standby power unit includes backup DC power source, voltage judge module and direct current fall During pressure modular converter, it is that described controlled electric appliance is powered step that described switch unit controls by described standby power unit Suddenly include:
Described backup DC power source output DC voltage；
When described voltage judge module determine described backup DC power source output DC voltage more than or etc. When described threshold voltage, this direct voltage output to described DC decompression is changed by described voltage judge module Module, the backup DC power source from described voltage judge module is exported by described DC decompression modular converter DC voltage carries out DC decompression conversion, to obtain direct voltage of voltage regulation, and is exported by this direct voltage of voltage regulation To described switch unit；
When described voltage judge module determines the DC voltage of described backup DC power source output less than described During threshold voltage, described voltage judge module is by this direct voltage output to described switch unit；Described switching Unit controls the direct voltage output after this voltage stabilizing to controlled electric appliance, thinks that described controlled electric appliance is powered；
And/or,
When described standby power unit also includes polarity protection module, described switch unit controls by described standby It is that described controlled electric appliance energizing step also includes with power subsystem:
The DC voltage that described backup DC power source is exported by polarity protection module carries out polarity protection, afterwards will This direct voltage output is to described voltage judge module.
Concrete, when described judging unit includes comparison module and control signal generation module, described switching list When unit includes main control circuit and standby control circuit,
Described judgement step includes:
The magnitude of voltage of the DC voltage of described comparison module more described main power source unit output and reference voltage Magnitude of voltage, and when the magnitude of voltage of DC voltage of described main power source unit output is more than described reference voltage The first comparison signal is exported, when the magnitude of voltage of the DC voltage of described main power source unit output is less than during magnitude of voltage The second comparison signal is exported during the magnitude of voltage of described reference voltage；
Described control signal generation module generates the first main control signal and according to described first comparison signal One spare control signal, generates the second main control signal and the second standby control according to described second comparison signal Signal；
Described switch step includes:
When described control signal generation module generates the first main control signal, described master control circuit controls is led Logical connection between described main power source unit and described power input, when described control signal generation module is raw The second the most described master control circuit controls of main control signal is become to disconnect described main power source unit and described power supply Connection between input；
The described standby control circuit control when described control signal generation module generates the first spare control signal System disconnects the connection between described standby power unit and described power input, when described control signal generates Module generates described standby control circuit during the second spare control signal and controls to turn on described standby power unit And the connection between described power input.
Electric power system described in the embodiment of the present invention includes main power source unit, standby power unit and above-mentioned electricity Source automatic switching control equipment.
The above is the preferred embodiment of the present invention, it is noted that for the common skill of the art For art personnel, on the premise of without departing from principle of the present invention, it is also possible to make some improvements and modifications, These improvements and modifications also should be regarded as protection scope of the present invention.

Claims (15)

1. an automatic power-supply switch, it is characterised in that include judging unit and switch unit；
Described judging unit, is connected with main power source unit, for judging the direct current that described main power source unit exports In the range of whether the magnitude of voltage of voltage is in the operational voltage value of controlled electric appliance；
Described switch unit, respectively with described controlled electric appliance, described main power source unit and standby power unit even Connect, be in described operational voltage value model for determining the magnitude of voltage of described DC voltage when described judging unit Controlling by described main power source unit when enclosing interior is that described controlled electric appliance is powered, and when described judging unit determines Control by described stand-by power supply list when the magnitude of voltage of described DC voltage is in outside described operational voltage value scope Unit powers for described controlled electric appliance.
2. automatic power-supply switch as claimed in claim 1, it is characterised in that described main power source list Unit includes power supply adaptor；The input of described power supply adaptor is connected with electric network source, described power adaptation The outfan of device is connected with described judging unit；
Described power supply adaptor is for being converted to have the first predetermined voltage by the alternating current from electric network source The DC voltage of value；
Described standby power unit includes backup DC power source, voltage judge module and DC decompression modulus of conversion Block；
Described voltage judge module, respectively with described backup DC power source, described DC decompression modular converter and Described switch unit connect, for when determine described backup DC power source output DC voltage more than or etc. By this direct voltage output to described DC decompression modular converter when threshold voltage, described standby when determining The DC voltage of DC source output less than during described threshold voltage by this direct voltage output to described switching Unit；
Described DC decompression modular converter, is connected with described switch unit, for judging from described voltage The DC voltage of the backup DC power source output of module carries out DC decompression conversion, to obtain direct current of voltage regulation Pressure, and by the output of this direct voltage of voltage regulation to described switch unit.
3. automatic power-supply switch as claimed in claim 2, it is characterised in that described DC decompression Modular converter is specifically for the DC voltage exported by the backup DC power source from described voltage judge module Carry out blood pressure lowering conversion, thus obtain the decompression DC voltage with the second scheduled voltage, afterwards to described fall Pressure DC voltage boosts, to obtain the direct voltage of voltage regulation with the first scheduled voltage and this is steady Pressure direct voltage output is to described switch unit.
4. automatic power-supply switch as claimed in claim 3, it is characterised in that described DC decompression Modular converter includes blood pressure lowering conversion chip and booster circuit；
The model of described blood pressure lowering conversion chip is TPS54821；
The PVIN1 pin of described blood pressure lowering conversion chip, is connected with described backup DC power source, is used for receiving The DC voltage of described backup DC power source output；
The V_SNS pin of described blood pressure lowering conversion chip, is connected with described booster circuit, for by described tool The decompression DC voltage having the second scheduled voltage is sent to described booster circuit.
5. automatic power-supply switch as claimed in claim 4, it is characterised in that described booster circuit Including the first divider resistance, the second divider resistance and electric capacity of voltage regulation；
First end ground connection of described first divider resistance, the second end of described first divider resistance and described second First end of divider resistance connects, and the second end of described second divider resistance is connected with described switch unit；
Described electric capacity of voltage regulation is in parallel with described first divider resistance；
The V_SNS pin of described blood pressure lowering conversion chip is connected with the second end of described first divider resistance.
6. automatic power-supply switch as claimed in claim 2, it is characterised in that described stand-by power supply Unit also includes:
Polarity protection module, the DC voltage output end being connected to described backup DC power source is sentenced with described voltage Between disconnected module, carry out polarity protection for the DC voltage that described backup DC power source is exported.
7. the automatic power-supply switch as described in any claim in claim 2 to 6, its feature Being, described judging unit includes:
Comparison module, for magnitude of voltage and the reference voltage of the relatively DC voltage of described main power source unit output Magnitude of voltage, and when the magnitude of voltage of DC voltage of described main power source unit output is more than described reference voltage The first comparison signal is exported, when the magnitude of voltage of the DC voltage of described main power source unit output is less than during magnitude of voltage The second comparison signal is exported during the magnitude of voltage of described reference voltage；And,
Control signal generation module, is connected with described comparison module, for raw according to described first comparison signal Become the first main control signal and the first spare control signal, generate the second master control according to described second comparison signal Signal processed and the second spare control signal；
Described comparison module includes that comparison signal outfan, described first comparison signal and described second compare letter Number all exported by described comparison signal outfan；
Described control signal generation module includes main control signal outfan and spare control signal outfan；Institute State the first main control signal and described second main control signal is all exported by described main control signal outfan, institute State the first spare control signal and described second spare control signal all by described spare control signal outfan Output；
Described switch unit includes main control circuit and standby control circuit；
Described main control circuit, be connected to described main power source unit and described controlled electric appliance power input it Between, for turning on described main power source when described control signal generation module generates the first main control signal time control system Connection between unit and described power input, when described control signal generation module generates the second main control Control during signal to disconnect the connection between described main power source unit and described power input；
Described standby control circuit, is connected to the power supply input of described standby power unit and described controlled electric appliance Between end, described for controlling disconnection when described control signal generation module generates the first spare control signal Connection between standby power unit and described power input, when described control signal generation module generates the Two spare control signal time control systems turn on the connection between described standby power unit and described power input.
8. automatic power-supply switch as claimed in claim 7, it is characterised in that described control signal Generation module also includes:
Spare control signal generative circuit, respectively with described comparison signal outfan, reference voltage output end and Described spare control signal outfan connects, for controlling when described comparison module exports the first comparison signal Described spare control signal outfan exports the first spare control signal, when described comparison module output the second ratio Relatively control described spare control signal outfan during signal and export the second spare control signal；And,
Main control signal generative circuit, defeated with described reference voltage output end, described spare control signal respectively Go out end and described main control signal outfan connects, for exporting first when described spare control signal outfan Spare control signal controls described main control signal outfan and exports the first main control signal, when described standby control Signal output part processed controls described main control signal outfan output second when exporting the second spare control signal Main control signal.
9. automatic power-supply switch as claimed in claim 8, it is characterised in that described first compares Signal is the first level, and described second comparison signal is second electrical level；
Described spare control signal generative circuit include the first standby control resistance, standby control transistor, Two standby control resistance and the 3rd standby control resistance；
First end of described first standby control resistance is connected with described comparison signal outfan, described first standby It is connected with the grid of described standby control transistor with the second end controlling resistance；
First pole of described first standby control transistor is by described second standby control resistance and described base Quasi-voltage output end connects, and the first pole of described first standby control transistor is also by described 3rd standby control Resistance processed is connected with described spare control signal outfan；Second pole of described first standby control transistor with Second electrical level outfan connects；
Described main control signal generative circuit includes main control resistance and main control transistor；
The grid of described main control transistor is connected with described spare control signal outfan, described master control combinations First pole of body pipe is connected with described main control signal outfan, the second pole of described main control transistor and the Two level output ends connect；
Described main control resistance be connected to described reference voltage output end and described main control signal outfan it Between.
10. automatic power-supply switch as claimed in claim 7, it is characterised in that described main control electricity Road includes that the first relay, described standby control circuit include the second relay；
The control end of described first relay is connected with described main control signal outfan, described first relay Input be connected with described main power source unit, the outfan of described first relay and described controlled electric appliance Power input connects；
The control end of described second relay is connected with described spare control signal outfan, described second relay The input of device is connected with described standby power unit, the outfan of described second relay and described controlled electricity The power input of device connects.
11. automatic power-supply switch as claimed in claim 7, it is characterised in that described judging unit Also include: reference voltage generation module, be connected with described main power source unit and described standby power unit respectively, The unidirectional current exported for the DC voltage exported according to described main power source unit and described standby power unit Pressure generates described reference voltage；
Described reference voltage generation module includes reference voltage output end, the first divider resistance, the second dividing potential drop electricity Resistance, the 3rd divider resistance, the 4th divider resistance and dividing potential drop diode；
The anode of described dividing potential drop diode is connected with described standby power unit by described 3rd divider resistance, The anode of described dividing potential drop diode is also by described 4th divider resistance ground connection；
The negative electrode of described dividing potential drop diode is connected with described main power source unit by described first divider resistance, institute Stating the negative electrode of dividing potential drop diode also by described second divider resistance ground connection, the negative electrode of described dividing potential drop diode is also It is connected with described reference voltage output end.
12. 1 kinds of power supply automatic switching methods, are applied to such as any claim in claim 1 to 11 Described automatic power-supply switch, it is characterised in that described power supply automatic switching method includes:
Judge step: judging unit judge the magnitude of voltage of the DC voltage that main power source unit exports whether be in by In the range of the operational voltage value of control electrical equipment；
Switch step: be in described work electricity when described judging unit determines the magnitude of voltage of described DC voltage Time in the range of pressure value, it is that described controlled electric appliance is powered that described switch unit controls by described main power source unit；When Described judging unit determine the magnitude of voltage of described DC voltage be in described operational voltage value scope outer time, institute State switch unit and control by described standby power unit to be that described controlled electric appliance is powered.
13. power supply automatic switching methods as claimed in claim 12, it is characterised in that when described standby When power subsystem includes backup DC power source, voltage judge module and DC decompression modular converter, described switching It is that described controlled electric appliance energizing step includes that unit controls by described standby power unit:
Described backup DC power source output DC voltage；
When described voltage judge module determine described backup DC power source output DC voltage more than or etc. When described threshold voltage, this direct voltage output to described DC decompression is changed by described voltage judge module Module, the backup DC power source from described voltage judge module is exported by described DC decompression modular converter DC voltage carries out DC decompression conversion, to obtain direct voltage of voltage regulation, and is exported by this direct voltage of voltage regulation To described switch unit；
When described voltage judge module determines the DC voltage of described backup DC power source output less than described During threshold voltage, described voltage judge module is by this direct voltage output to described switch unit；Described switching Unit controls the direct voltage output after this voltage stabilizing to controlled electric appliance, thinks that described controlled electric appliance is powered；
And/or,
When described standby power unit also includes polarity protection module, described switch unit controls by described standby It is that described controlled electric appliance energizing step also includes with power subsystem:
The DC voltage that described backup DC power source is exported by polarity protection module carries out polarity protection, afterwards will This direct voltage output is to described voltage judge module.
The 14. power supply automatic switching methods as described in claim 12 or 13, it is characterised in that when described Judging unit includes comparison module and control signal generation module, described switch unit include main control circuit and During standby control circuit,
Described judgement step includes:
The magnitude of voltage of the DC voltage of described comparison module more described main power source unit output and reference voltage Magnitude of voltage, and when the magnitude of voltage of DC voltage of described main power source unit output is more than described reference voltage The first comparison signal is exported, when the magnitude of voltage of the DC voltage of described main power source unit output is less than during magnitude of voltage The second comparison signal is exported during the magnitude of voltage of described reference voltage；
Described control signal generation module generates the first main control signal and according to described first comparison signal One spare control signal, generates the second main control signal and the second standby control according to described second comparison signal Signal；
Described switch step includes:
When described control signal generation module generates the first main control signal, described master control circuit controls is led Logical connection between described main power source unit and described power input, when described control signal generation module is raw The second the most described master control circuit controls of main control signal is become to disconnect described main power source unit and described power supply Connection between input；
The described standby control circuit control when described control signal generation module generates the first spare control signal System disconnects the connection between described standby power unit and described power input, when described control signal generates Module generates described standby control circuit during the second spare control signal and controls to turn on described standby power unit And the connection between described power input.
15. 1 kinds of electric power systems, it is characterised in that include main power source unit, standby power unit and such as weigh Profit requires the automatic power-supply switch in 1 to 13 described in any claim.
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CN106340957A (en) * 2016-11-09 2017-01-18 浪潮（苏州）金融技术服务有限公司 Power supply circuit switching device and method and power supply system
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CN109546739A (en) * 2017-09-21 2019-03-29 航天科工惯性技术有限公司 Dual-power switching system and with its with bore gyroscopic survey device
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CN111277039A (en) * 2020-01-21 2020-06-12 南京迈瑞生物医疗电子有限公司 Power management method and power system of operating room equipment, operating lamp and operating table
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CN111711171A (en) * 2020-06-18 2020-09-25 广东博智林机器人有限公司 Power protection circuit and servo driver
CN111711171B (en) * 2020-06-18 2022-08-19 广东博智林机器人有限公司 Power protection circuit and servo driver
CN112130655A (en) * 2020-08-28 2020-12-25 浪潮电子信息产业股份有限公司 Power supply circuit of equipment to be refreshed and server
CN112130655B (en) * 2020-08-28 2022-06-10 浪潮电子信息产业股份有限公司 Power supply circuit of equipment to be refreshed and server
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CN112583107B (en) * 2020-12-15 2023-08-01 广东新力宽频网络有限公司 Power supply switching circuit and power supply switching system

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