CN105024450B - Dual-power automatic switching device and its switching control method, dual power supply system - Google Patents
Dual-power automatic switching device and its switching control method, dual power supply system Download PDFInfo
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- CN105024450B CN105024450B CN201510485795.4A CN201510485795A CN105024450B CN 105024450 B CN105024450 B CN 105024450B CN 201510485795 A CN201510485795 A CN 201510485795A CN 105024450 B CN105024450 B CN 105024450B
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Abstract
The invention discloses a kind of dual-power automatic switching devices, belong to low-voltage electrical technical field.In order to solve the problems, such as that the prior art uses semiconductor switch as double power supply converting switch to meet brought by sensitive loads requirement, the present invention does not pursue the conversion speed for improving double power supply converting switch, but guarantee the security reliability of system using mechanical double power supply converting switch, an auxiliary power unit simply controlled by control unit is introduced simultaneously, control auxiliary power unit carries out short-duration power to load to maintain the normal operation of high sensitive loads in the conversion process of dual power supply conversion, it by main power source or backup power source is still load supplying after converting.The invention also discloses the switching control method of above-mentioned dual-power automatic switching device and a kind of dual power supply systems.The present invention can meet the power demands of the sensitive loads as metal halid lamp, and high safety and reliability, cost of implementation are low.
Description
Technical field
The present invention relates to a kind of dual-power automatic switching devices, more particularly to a kind of power supply need that can meet high sensitive loads
It asks and the dual-power automatic switching device and its switching control method of high reliability, belongs to low-voltage electrical technical field.
Background technique
There are some electricity consumptions for needing continued power in fields such as modern industry, medical treatment, business and daily lifes to set
It is standby, in order to meet the continued power requirement of these electrical equipments, the power supply plan to supply power with double circuit is usually taken, that is, utilizes dual power supply
Automatic transfer equipment realizes the automatic switchover of active and standby two-way power supply.Dual-power automatic switching device generally includes detection unit, control
Unit and double power supply converting switch processed, detection unit are used to be measured in real time the input voltage of main power source and backup power source,
Control unit controls double power supply converting switch according to the testing result of detection unit to realize the automatic conversion of active and standby power supply.
For existing dual-power automatic switching device in carrying out power supply conversion process, the execution logic of double power supply converting switch is first to have no progeny
Close, i.e., first disconnect main power source, then connect backup power source, thus will appear of short duration power-off (traditional mechanical switch
Conversion time is usually several ms), this of short duration power-off is acceptable for most of loads.However, also depositing
It is very harsh for power supply sustainable requests in some high sensitive loads.For example, being mainly used in the photograph such as stadiums, tunnel
Bright metal halid lamp is exactly a kind of typical sensitive loads.The maximum feature of metal halid lamp be when power is off between more than 5ms
Afterwards, it needs to light again after 10min or so.Obviously, if in important sports tournament or in engineering construction suddenly
Have a power failure, will cause very big trouble.In order to enable dual-power automatic switching device can satisfy the requirement of high sensitive loads, it is a kind of
Existing solution is using controllable semiconductor switch as double power supply converting switch, to improve the conversion speed of two-way power supply
Degree.Although this scheme the conversion time of two-way power supply can be greatly reduced, need individually designed to semiconductor switch
Cooling system increases the cost of system；In addition, semiconductor devices works long hours, life and reliability compares traditional machine
Tool formula twin-power switch can decline, to affect the security reliability of entire power supply system.
Summary of the invention
The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and to provide one kind can meet high sensitive loads
Power demands and with high reliability dual-power automatic switching device and its switching control method.
The present invention specifically uses following technical scheme to solve above-mentioned technical problem:
A kind of dual-power automatic switching device, comprising: main power source input terminal, backup power source input terminal, power output end, double
Power supply switch unit；The dual power supply switch unit includes detection unit, control unit, mechanical double power supply converting switch,
Detection unit for being measured in real time to the input voltage of main power source input terminal and backup power source input terminal, control unit according to
The testing result control double power supply converting switch of detection unit is to realize the automatic conversion of active and standby power supply；The dual power supply is cut
Changing unit further includes an auxiliary power unit, and the auxiliary power unit includes inversion unit, the output end of inversion unit and institute
Power output end connection is stated, the control terminal of inversion unit is connect with control unit；Conversion process of the control unit in active and standby power supply
In, control auxiliary power unit exports electric energy.
In above-mentioned technical proposal, the electric energy of auxiliary power unit is obtained from main power source and/or backup power source, electric according to obtaining
The difference of energy mode, the direct-furnish that auxiliary power unit can be roughly divided into the accumulation energy type for needing energy storage component and not need energy storage component
This two major classes of type are as follows respectively:
Accumulation energy type:
The auxiliary power unit further includes energy storage component and rectification unit；Rectification unit is used for from main power source and/or standby
Electric energy, which is extracted, with power supply supplies energy storage component；The energy storage component passes through the rectification in main power source and backup power source powering phase
Unit carries out energy storage, exports electric energy by the inversion unit in the conversion process of active and standby power supply.
Preferably, the auxiliary power unit further includes the change-over switch connecting with rectification unit, the change-over switch
Two input terminals and control terminal are connect with main power source input terminal, backup power source input terminal, control unit respectively, the rectification unit
It is connect with rear class energy storage component, the conversion logic of the change-over switch and the switch logic of double power supply converting switch are opposite.
Preferably, the outlet side of the input terminal of the rectification unit and the double power supply converting switch or main power source or
Backup power source connection.
Preferably, the rectification unit includes the first rectification circuit and the second rectification circuit, the first rectification circuit, second whole
The input terminal of current circuit is separately connected main power source input terminal, backup power source input terminal, the first rectification circuit, the second rectification circuit
Output end is connect after being connected with each other with rear class energy storage component.
Preferably, the auxiliary power unit further includes regulator.The regulator, which can be, is set to rectification list
Transformer before member or after inversion unit is also possible to be set to the DC/DC electricity between rectification unit and inversion unit
Road.
Accumulation energy type auxiliary power unit is specific as follows there are also a kind of special shape for not needing rectification unit:
The inversion unit is that one end is connected with the two-way inverter of energy storage component, the other end of two-way inverter with it is described
Power output end connection.
Preferably, the two-way inverter and energy storage component pass through two-way DC/DC circuit connection.
Direct-furnish type:
The auxiliary power unit further includes rectification unit；Rectification unit is used to extract electricity from main power source or backup power source
Can, electric energy is exported by the inversion unit in the conversion process of active and standby power supply.
Preferably, the auxiliary power unit further includes the change-over switch connecting with rectification unit, the change-over switch
Two input terminals and control terminal are connect with main power source input terminal, backup power source input terminal, control unit respectively, the rectification unit
It is connect with later stage inversion unit, the conversion logic of the change-over switch and the switch logic of double power supply converting switch are opposite.
Preferably, the rectification unit includes the first rectification circuit and the second rectification circuit, the first rectification circuit, second whole
The input terminal of current circuit is separately connected main power source input terminal, backup power source input terminal, the first rectification circuit, the second rectification circuit
Output end is connect after being connected with each other with later stage inversion unit.
Preferably, the input terminal of the rectification unit is connect with main power source or backup power source.
Preferably, the auxiliary power unit further includes regulator.The regulator, which can be, is set to rectification list
Transformer before member or after inversion unit is also possible to be set to the DC/DC electricity between rectification unit and inversion unit
Road.
The double power supply converting switch can be electromagnetic mechanical switch or motor drive formula mechanical switch.
The switching control method of dual-power automatic switching device described in any technical solution as above, comprising the following steps:
Step 1, detection unit examine the input voltage of main power source input terminal and/or backup power source input terminal in real time
It surveys, and will test result and be transmitted to control unit；
Step 2, control unit to input voltage carry out operation, and judge work at present power supply voltage effective value whether
Within the scope of preset voltage effective value, if so, 1 is then gone to step, if not, going to step 3；
Step 3, control unit control double power supply converting switch carry out active and standby power supply switching, and control auxiliary power supply list
Member starts to be exported to load, carries out output power supply to load by auxiliary power unit in active and standby power supply handoff procedure；
Step 4 completes the switching of active and standby power supply when double power supply converting switch, and control unit controls auxiliary power unit and stops
Load is exported, step 1 is then gone to.
According to identical invention thinking can also obtain a kind of dual power supply system, including main power source, backup power source with
And dual-power automatic switching device described in any technical solution as above, it is the main power source input terminal of dual-power automatic switching device, standby
It is connect respectively with main power source, backup power source with power input.
Compared with prior art, the invention has the following advantages:
The present invention may make the load power down time in main power supply conversion process to minimize, and meet as metal halid lamp
The safe power supply demand of the same sensitive loads；
The present invention uses mechanical double power supply converting switch, and high safety and reliability, cost of implementation is low.
Detailed description of the invention
Fig. 1 is the principle schematic diagram of the first embodiment of dual power supply system of the present invention；
Fig. 2 is the principle schematic diagram of second of embodiment of dual power supply system of the present invention；
Fig. 3 is the principle schematic diagram of the third embodiment of dual power supply system of the present invention；
Fig. 4 is the principle schematic diagram of the 4th kind of embodiment of dual power supply system of the present invention；
Fig. 5 is the principle schematic diagram of the 5th kind of embodiment of dual power supply system of the present invention；
Fig. 6 is the specific implementation circuit diagram using the dual power supply system of the present invention of three-phase four-wire system；
Fig. 7 is the workflow schematic diagram of dual power supply system of the present invention.
Specific embodiment
Technical solution of the present invention is described in detail with reference to the accompanying drawing:
As background technology part is spoken of, in order to enable dual-power automatic switching device can satisfy metalloid halogen
The requirement of the high sensitive loads of plain lamp, existing solution are using controllable semiconductor switch as double power supply converting switch,
To improve the conversion speed of two-way power supply.Although this scheme the conversion time of two-way power supply can be greatly reduced, need
The cost of system is increased to the individually designed cooling system of semiconductor switch；In addition, semiconductor devices works long hours,
Life and reliability can decline compared to tradition machinery formula twin-power switch, to affect the safe and reliable of entire power supply system
Property.To solve the above problems, the present invention does not pursue the conversion speed for improving double power supply converting switch, but use mechanical
Double power supply converting switch introduces the auxiliary that one is simply controlled by control unit and supplies to guarantee the security reliability of system
Electric unit, control auxiliary power unit carries out (specific power-on time root in short-term to load in the conversion process of dual power supply conversion
Depending on the conversion time of double power supply converting switch, usually several ms) power supply to maintain the normal operations of high sensitive loads,
It by main power source or backup power source is still load supplying after converting.
Mechanical double power supply converting switch used herein can be existing electromagnetic mechanical switch, motor drive
Formula mechanical switch or other types of mechanical switch.The electromagnetic mechanical switch includes for driving double power supply converting switch
Switching mechanism that contact system is acted, for driving switching mechanism to carry out the electromagnet of dual power supply conversion, and for controlling
The controllable semiconductor switch of magnet switching processed；The control terminal of controllable semiconductor switch is connect with described control unit.The electricity
Machine driven type mechanical switch includes switching mechanism, for driving switching mechanism to carry out the motor transmission system of dual power supply conversion, electricity
The control terminal of machine transmission system is connect with described control unit.
In technical solution of the present invention, the electric energy of auxiliary power unit is obtained from main power source and/or backup power source, according to acquisition
The difference of electric energy mode, the direct-furnish type that auxiliary power unit can be divided into the accumulation energy type for needing energy storage component and not need energy storage component
This two major classes.For the ease of public understanding, technical solution of the present invention is illustrated with several specific embodiments below.
Fig. 1 shows the structural principle of the first embodiment of dual power supply system of the present invention.As shown in Figure 1, double electricity
Source power supply system includes power supply 1, power supply 2 and dual-power automatic switching device；Dual-power automatic switching device includes: main power source
Input terminal, backup power source input terminal, power output end, dual power supply switch unit, wherein main power source input terminal, backup power source input
End is connect with power supply 1, power supply 2 respectively, and power output end is connect with load (being Metal halogen lamp in figure).The dual power supply switch unit
Including detection unit, control unit, mechanical double power supply converting switch and auxiliary power unit；Detection unit is used for master
The input voltage of power input and backup power source input terminal is measured in real time, and control unit is according to the detection knot of detection unit
Fruit control double power supply converting switch is to realize the automatic conversion of active and standby power supply.As shown in Figure 1, the auxiliary in the present embodiment supplies
Electric unit includes transformer, rectification circuit, storage capacitor and inversion unit, and input terminal and the dual power supply switching of step-up transformer are opened
The outlet side (being also possible to power supply 1 or power supply 2) of pass connects.During power supply 1 or power supply 2 are load supplying, auxiliary is supplied
Electric unit is in energy storage mode, and the electric energy that power supply 1 or power supply 2 export boosts through transformer and is rectified into high voltage
After direct current, it is stored in storage capacitor；When controller detects the Voltage Drop of work at present power supply (being power supply 1 in figure)
When, then control unit control double power supply converting switch carries out the switching of power supply, and controls auxiliary power unit and enter Working mould
Formula, the electric energy that storage capacitor is stored through inversion unit output be load supplying, in the handoff procedure of power supply 1 and power supply 2 by
Auxiliary power unit carries out output power supply to load；After double power supply converting switch is completed to switch, controller controls inversion unit
Stop output, auxiliary power unit is again introduced into energy storage mode.Transformer in the present embodiment may also set up in inversion unit with
Between power output end.Carefully analyze it can be found that if the input terminal (i.e. the input terminal of transformer) of auxiliary power unit with
Power supply 1 or power supply 2 connect, then in double power supply converting switch handoff procedure, auxiliary power unit can be directly from power supply 1 or power supply
2 take electricity supply load, then the storage capacitor in auxiliary power unit can remove, or be changed to filter capacitor, auxiliary at this time
Power supply unit is direct-furnish type.
Fig. 2 shows the structural principle of second of embodiment of dual power supply system of the present invention.It is auxiliary in the present embodiment
Helping power supply unit includes sequentially connected rectification circuit, recharged capacitance, DC/DC circuit, storage capacitor, inversion unit, rectification
The input terminal of circuit and the outlet side (being also possible to power supply 1 or power supply 2) of double power supply converting switch connect.At auxiliary power unit
When energy storage mode, received energy stores are suitable straight by DC/DC circuit conversion in recharged capacitance by rectification circuit
Galvanic electricity pressure powers to inversion unit, and is able to maintain that DC bus-bar voltage is in a high voltage, and energy is stored in energy storage
Among capacitor, to provide enough energy for inversion unit；Similarly, when controller detects work at present power supply (in figure
For power supply 1) Voltage Drop or other reasons when needing Switching power, then control unit control double power supply converting switch carries out electricity
The switching in source, and control auxiliary power unit and enter operating mode, it is load supplying that inversion unit, which starts output, in power supply 1
Output power supply is carried out to load by auxiliary power unit in the handoff procedure of power supply 2；When double power supply converting switch is completed to switch
Afterwards, controller control inversion unit stops output, and auxiliary power unit is again introduced into energy storage mode.Likewise, such as auxiliary power supply
The input terminal (i.e. the input terminal of rectification circuit) of unit is connect with power supply 1 or power supply 2, then in double power supply converting switch handoff procedure
In, auxiliary power unit directly can take electricity supply load from power supply 1 or power supply 2, then the storage capacitor in auxiliary power unit can
With removal, or it is changed to filter capacitor, auxiliary power unit at this time is direct-furnish type.Wherein, for adjusting the DC/DC electricity of voltage
Road can also be replaced with transformer, as long as transformer is set to before rectification unit or after inversion unit.
Fig. 3 shows the structural principle of the third embodiment of dual power supply system of the present invention.As shown in figure 3, wherein
Auxiliary power unit structure it is identical with Fig. 2.As shown in figure 3, the input terminal of rectification circuit and change-over switch is defeated
Side connects out, and two input terminals and control terminal of change-over switch are single with main power source input terminal, backup power source input terminal, control respectively
Member connection, the conversion logic of the change-over switch and opposite (the i.e. double power supply converting switch of the switch logic of double power supply converting switch
After power supply 1 is switched to from power supply 2, change-over switch switches to power supply 2 from power supply 1；After double power supply converting switch switches to power supply 2, conversion is opened
Concern arrives power supply 1).Power supply 1 is during loading normal power supply, and the storage capacitor in auxiliary power unit extracts electricity from power supply 2
It can and store；When control unit detects that the Voltage Drop of power supply 1 or other reasons need Switching power, control unit control
Double power supply converting switch carries out the switching of power supply, and controls auxiliary power unit and enter operating mode, and inversion unit starts defeated
It is out load supplying, output power supply is carried out to load by auxiliary power unit in the handoff procedure of power supply 1 and power supply 2；Double electricity
After source switching switch completes switching, controller control change-over switch switches to power supply 1, and controls inversion unit and stop output,
Load at this time by power supply 2 directly power, and the storage capacitor in auxiliary power unit from power supply 1 extract electric energy and store (if
Power supply 1 being capable of normal power supply).Similarly, due in double power supply converting switch handoff procedure, auxiliary power unit can directly from
Power supply 1 or power supply 2 take electricity supply load, therefore the storage capacitor in auxiliary power unit can remove, or be changed to filtered electrical
Hold, auxiliary power unit at this time is direct-furnish type.For adjust voltage DC/DC circuit can also be set to rectification unit it
Transformer after preceding or inversion unit replaces.
Fig. 4 shows the structural principle of the 4th kind of embodiment of dual power supply system of the present invention.As shown in figure 4, wherein
Auxiliary power unit include the first rectification circuit, it is the second rectification circuit, recharged capacitance, DC/DC circuit, storage capacitor, inverse
Become unit, the first rectification circuit, the second rectification circuit input terminal be separately connected main power source input terminal, backup power source input terminal,
First rectification circuit, the second rectification circuit output end be connected with each other after again successively with recharged capacitance, DC/DC circuit connection.
Energy after power supply 1 and the reception of power supply 2, is stored in recharged capacitance, by DC/DC circuit to inverse by two-way rectification circuit jointly
Become unit power supply, and is able to maintain that DC bus-bar voltage is in a high voltage.When control unit detects that the voltage of power supply 1 falls
It falls or when other reasons need Switching power, control unit controls double power supply converting switch and carries out the switching of power supply, and controls
Auxiliary power unit enters operating mode, and it is load supplying that inversion unit, which starts output, in the handoff procedure of power supply 1 and power supply 2
In by auxiliary power unit output power supply is carried out to load；After double power supply converting switch is completed to switch, controller controls inversion
Unit stops output.Since two-way rectification circuit extracts electric energy from power supply 1, power supply 2 respectively, cut in double power supply converting switch
During changing, auxiliary power unit has external electric energy input always, therefore the storage capacitor in auxiliary power unit can remove,
Or it is changed to filter capacitor, auxiliary power unit at this time is direct-furnish type.DC/DC circuit therein can also be with being set to inversion
Transformer after unit replaces.
Fig. 5 shows the structural principle of the 5th kind of embodiment of dual power supply system of the present invention.As shown in figure 5, this reality
Applying the auxiliary power unit in example is the two-way inverter that one end is connected with energy storage component, and the other end connection of two-way inverter is negative
It carries.When power supply 1 works normally, two-way inverter is rectification energy storage mode, draws electric energy after over commutation from load end and stores
In energy storage component；When control unit detects that the Voltage Drop of power supply 1 or other reasons need Switching power, control unit control
Double power supply converting switch processed carries out the switching of power supply, and controls auxiliary power unit and enter operating mode, two-way inverter into
Enter inversion output state, be load supplying, load is carried out by auxiliary power unit in the handoff procedure of power supply 1 and power supply 2
Output power supply；After double power supply converting switch is completed to switch, controller controls two-way inverter and is again introduced into rectification energy storage mode.
Two-way DC/DC circuit can also be further accessed between two-way inverter and energy storage component, positive inversion is risen when exporting
Pressure is depressured, so as to reduce the required capacity of energy storage component when reversely rectifying energy storage.
The switching control method of dual-power automatic switching device of the present invention the following steps are included:
Step 1, detection unit examine the input voltage of main power source input terminal and/or backup power source input terminal in real time
It surveys, and will test result and be transmitted to control unit；
Step 2, control unit to input voltage carry out operation, and judge work at present power supply voltage effective value whether
Within the scope of preset voltage effective value, if so, 1 is then gone to step, if not, going to step 3；
Step 3, control unit control double power supply converting switch carry out active and standby power supply switching, and control auxiliary power supply list
Member starts to be exported to load, carries out output power supply to load by auxiliary power unit in active and standby power supply handoff procedure；
Step 4 completes the switching of active and standby power supply when double power supply converting switch, and control unit controls auxiliary power unit and stops
Load is exported, step 1 is then gone to.
Following several situations can be divided into step 3:
1, control unit sends control signal control double power supply converting switch and carries out active and standby power supply switching, in control unit
Send control unit control auxiliary in the period before the contact system after controlling signal to double power supply converting switch is acted
Power supply unit starts to be exported to load.
2, control unit sends control signal control double power supply converting switch and carries out active and standby power supply switching, while controlling list
Member sends control signal control auxiliary power unit and starts to be exported to load.
3, control unit sends control signal control auxiliary power unit and starts to be exported to load, then control unit
It sends
It controls signal control double power supply converting switch and carries out active and standby power supply switching.
The present invention is applicable not only to single-phase load, is also applied for multiphase load, and Fig. 6 is shown using three-phase four-wire system
A kind of specific implementation circuit of dual power supply system of the present invention.Wherein, S1, S2 are respectively two-way power supply, and dual power supply switching is opened
Two input terminals closed are connected with S1 and S2 respectively, and the output end of double power supply converting switch is connected with load.As shown, auxiliary
The input terminal of power supply unit is connected with power supply S2, and alternating current is transformed into direct current by rectifier bridge, boosts using boost electric
Road is connected with the input terminal of inversion unit.The DC bus energy storage of inversion unit use capacitor C1, C2 series connection accumulation, the zero of load
The same midpoint C1, C2 of line is connected, and the output end of inversion unit is connected with load end.Control unit respectively with detection unit, dual power supply
Switching switch is connected with inversion unit, is responsible for the detection information that reception detection unit exports, and to double power supply converting switch and inverse
Become unit to be controlled.Detection unit real-time detection power supply S1, S2 information of voltage, judges whether S1 voltage falls or lift
It rises.Alternating current is transformed into direct current by rectifier bridge, and is charged to large capacity storage capacitor C.Control unit control
Boost booster circuit boosts to output voltage, and the both ends C1, C2 total voltage is raised to 800V.Control unit controls inversion unit
In three phase inverter bridge direct current is transformed into alternating current, export by LCL filter to load.
The workflow of above-mentioned dual power supply system is as shown in fig. 7, specific as follows:
The voltage signal of detection unit real-time detection power supply S1, power supply S2e 1、e 2, calculate the virtual value of power supply S1 voltageV 1rms, and locking phase is carried out to S1, S2；
Assuming that load work normally voltage effective value range be [V rmsMIN,V rmsMAX], whenV rmsMIN≤V 1rms≤V rmsMAX
When, auxiliary power unit works in energy storage mode, and network voltage charges by rectifier bridge to storage capacitor C, and C both end voltage is passed through
The total voltage at the both ends C1, C2 is risen to 800V and kept constant by boost booster circuit；Double power supply converting switch without switching,
Inversion unit does not export electric energy, load terminal voltage to loadU a 、U b WithU c It is equal with power supply S1 voltage；
WhenV 1rms<V rmsMINOrV 1rms>V rmsMAXWhen, control unit control double power supply converting switch is converted to power supply S2, and
And control auxiliary power unit enters operating mode, auxiliary power unit is same with power supply S2 to load output by inversion unit
Frequently, with the voltage of phase, and output voltage is controlledU a 、U b WithU c Meet simultaneouslyV rmsMIN≤U rms≤V rmsMAX；
When double power supply converting switch is after converting, control unit control inversion unit stops exporting electric energy to load.
Claims (21)
1. a kind of dual-power automatic switching device, comprising: main power source input terminal, backup power source input terminal, power output end, double electricity
Source switch unit；The main power source and backup power source is AC power source, and the dual power supply switch unit includes detection unit, control
Unit processed, mechanical double power supply converting switch, detection unit are used for the defeated of main power source input terminal and backup power source input terminal
Enter voltage to be measured in real time, control unit controls double power supply converting switch according to the testing result of detection unit to realize
The automatic conversion of active and standby power supply；It is characterized by: the two-way input terminal of the mechanical double power supply converting switch respectively with master
Power input and backup power source input terminal are direct-connected, and output end and the power output end are direct-connected, the power output end with
Load connection；The dual power supply switch unit further includes an auxiliary power unit, the electric energy of auxiliary power unit from main power source/or
Backup power source obtains, and the auxiliary power unit includes inversion unit, and the output end of inversion unit is as auxiliary power unit
Output end is connect with the power output end, and the control terminal of inversion unit is connect with control unit；Control unit is only in active and standby electricity
Auxiliary power unit is controlled in the conversion process in source and enters operating mode, exports the electric energy of auxiliary power unit through inversion unit
For load supplying, after this is converted, control inversion unit stops output power supply.
2. dual-power automatic switching device as described in claim 1, which is characterized in that the auxiliary power unit further includes energy storage
Component and rectification unit；Rectification unit, which is used to extract electric energy from main power source and/or backup power source, supplies energy storage component；The energy storage
Component carries out energy storage by the rectification unit in main power source and backup power source powering phase, in the conversion process of active and standby power supply
In by the inversion unit export electric energy.
3. dual-power automatic switching device as claimed in claim 2, which is characterized in that the auxiliary power unit further include with it is whole
Flow the change-over switch of unit connection, two input terminals and control terminal of the change-over switch respectively with main power source input terminal, spare
Power input, control unit connection, the rectification unit are connect with rear class energy storage component, the conversion logic of the change-over switch
It is opposite with the switch logic of double power supply converting switch.
4. dual-power automatic switching device as claimed in claim 2, which is characterized in that the input terminal of the rectification unit with it is described
The outlet side or main power source or backup power source of double power supply converting switch connect.
5. dual-power automatic switching device as claimed in claim 2, which is characterized in that the rectification unit includes the first rectified current
Road and the second rectification circuit, the first rectification circuit, the second rectification circuit input terminal be separately connected main power source input terminal, standby electricity
Source input terminal, the first rectification circuit, the second rectification circuit output end be connected with each other after connect with rear class energy storage component.
6. dual-power automatic switching device as claimed in claim 2, which is characterized in that the energy storage component is storage capacitor.
7. dual-power automatic switching device as claimed in claim 2, which is characterized in that the auxiliary power unit further includes pressure regulation
Device.
8. dual-power automatic switching device as claimed in claim 7, which is characterized in that the regulator is transformer, setting
Before rectification unit or after inversion unit.
9. dual-power automatic switching device as claimed in claim 7, which is characterized in that the regulator is DC/DC circuit, if
It is placed in front of or after energy storage component.
10. dual-power automatic switching device as described in claim 1, which is characterized in that the inversion unit is connected with for one end
The two-way inverter of energy storage component, the other end of two-way inverter are connect with the power output end.
11. dual-power automatic switching device as claimed in claim 10, which is characterized in that the two-way inverter and energy storage component
Pass through two-way DC/DC circuit connection.
12. dual-power automatic switching device as claimed in claim 10, it is characterised in that: the energy storage component is storage capacitor.
13. dual-power automatic switching device as described in claim 1, which is characterized in that the auxiliary power unit further includes whole
Flow unit；Rectification unit is used to extract electric energy from main power source or backup power source, by described in the conversion process of active and standby power supply
Inversion unit exports electric energy.
14. dual-power automatic switching device as claimed in claim 13, which is characterized in that the auxiliary power unit further include with
The change-over switch of rectification unit connection, two input terminals and control terminal of the change-over switch respectively with main power source input terminal, standby
It is connected with power input, control unit, the rectification unit is connect with later stage inversion unit, and the conversion of the change-over switch is patrolled
It collects opposite with the switch logic of double power supply converting switch.
15. dual-power automatic switching device as claimed in claim 13, which is characterized in that the rectification unit includes the first rectification
Circuit and the second rectification circuit, the first rectification circuit, the second rectification circuit input terminal be separately connected main power source input terminal, spare
Power input, the first rectification circuit, the second rectification circuit output end be connected with each other after connect with later stage inversion unit.
16. dual-power automatic switching device as claimed in claim 13, which is characterized in that the input terminal of the rectification unit and master
Power supply or backup power source connection.
17. dual-power automatic switching device as claimed in claim 13, which is characterized in that the auxiliary power unit further includes adjusting
Pressure device.
18. dual-power automatic switching device as claimed in claim 17, which is characterized in that the regulator is transformer, if
It is placed in front of rectification unit or after inversion unit.
19. dual-power automatic switching device as claimed in claim 17, which is characterized in that the regulator is DC/DC circuit,
It is set between rectification unit and inversion unit.
20. the control method of dual-power automatic switching device as described in any one of claim 1~19, which is characterized in that including
Following steps:
Step 1, detection unit are measured in real time the input voltage of main power source input terminal and/or backup power source input terminal, and
It will test result and be transmitted to control unit；
Whether step 2, control unit carry out operation to input voltage, and judge the voltage effective value of work at present power supply default
Voltage effective value within the scope of, if so, 1 is then gone to step, if not, going to step 3；
Step 3, control unit control double power supply converting switch carry out active and standby power supply switching, and control auxiliary power unit and open
Begin to be exported to load, output power supply is carried out to load by auxiliary power unit in active and standby power supply handoff procedure；
Step 4 completes the switching of active and standby power supply when double power supply converting switch, and control unit controls auxiliary power unit and stops to negative
Output is carried, step 1 is then gone to.
21. a kind of dual power supply system, including main power source, backup power source and as described in any one of claim 1~19 it is double
Power supply automatic converting device, the main power source input terminal of dual-power automatic switching device, backup power source input terminal respectively with main power source,
Backup power source connection.
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