CN203278382U - Uninterrupted switching power supply - Google Patents
Uninterrupted switching power supply Download PDFInfo
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- CN203278382U CN203278382U CN 201320217469 CN201320217469U CN203278382U CN 203278382 U CN203278382 U CN 203278382U CN 201320217469 CN201320217469 CN 201320217469 CN 201320217469 U CN201320217469 U CN 201320217469U CN 203278382 U CN203278382 U CN 203278382U
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Abstract
The utility model relates to an uninterrupted switching power supply, is characterized in that an automatic conversion device is additionally arranged between a PLC power supply system and a UPS to form an uninterrupted switching power supply, the input end of the automatic conversion device is connected with the output end of the UPS, the output end of the automatic conversion device is connected with the input end of the PLC power supply system, and the input end of the automatic conversion device is also directly connected with a 220V external power supply. The uninterrupted switching power supply has the beneficial effect that once a hardware fault occurs in the UPS in the PLC power supply system, seamless switching of the PLC power supply system can be realized, thereby ensuring stable operation of the PLC system. In a system adopting the PLC system and having two paths of formal power supplies, the uninterrupted switching power supply can be adopted to replace the UPS in the PLC system, thereby enabling electric equipment to operate normally and stably. When a hardware fault occurs in the UPS, the PLC power supply system can be switched to a standby power supply within five milliseconds.
Description
Technical field
The utility model belongs to stable-pressure device, relates in particular to the free of discontinuities Switching power between a kind of PLC of being applied to electric power system and UPS.
Background technology
At present, PLC has been widely used in the industry-by-industries such as iron and steel, oil, chemical industry, electric power, building materials, machine-building, automobile, light textile, communications and transportation, environmental protection and entertainment at home and abroad.Be exactly to utilize PLC as the core of automatic control system as a plurality of sewage treatment plants in the city, adopt and disperse centralized control system, guarantee the even running of water factory's production technology and water user's normal use, PLC has played vital effect.Wherein, electric power system is the important step that guarantees the normal operation of PLC system, for even running and the continous-stable that guarantees water factory externally supplies water, no matter from the lectotype selection at the initial stage of founding the factory, or the later stage build, must set up successive check.Find in actual production: the trend that the number of stoppages of PLC electric power system has cumulative year after year along with increase and the growth of running time of plant area's quantity.
The applicant has carried out statistical analysis for the failure rate of certain regeneration water factory PLC system, from 2002 year to 2011 annual total failare number of times add up to 60 times.Wherein, 220V ac power supply system reason causes (UPS) 20 times, and 24V DC power-supply system reason causes 14 times, and the auxiliary device reason causes 18 times.Can find out from statistics: the classification of the PLC system failure has PLC module reason, 220V ac power supply system reason, 24V DC power-supply system reason, auxiliary device reason.PLC module failure and auxiliary device fault only can impact the subrange of PLC system.And wherein electric power system (220V ac power supply system and the 24V DC power-supply system) number of stoppages is 34 times, accounts for 56% of total failare number of times, and the electric power system fault trend that cumulative year after year arranged along with increase and the growth of running time of plant area's quantity.UPS and 24V power failure can cause whole PLC systemic breakdown.
At present, the operation principle of PLC electric power system is that city's power supply source provides 220V to exchange output through uninterruption power source (UPS).Have the functions such as burning voltage, anti-electromagnetic interference, available battery pack continued power due to UPS, guaranteed that stable 220V exchanges output.When hardware fault occurs in UPS, can cause PLC electric power system dead electricity, cause operation all to stop.As the normal operation that recovers the PLC electric power system, need switch to manual mode, and require the staff skillfully to grasp operative skill, can recover normal production run after about 30 minutes, could process the fault of UPS after system's production run.And the fastest processing mode is changed UPS exactly, approximately needs 1 hour in the situation that there is spare part to change UPS, as without the parts replacement cycle longer; Another kind of processing mode is maintenance UPS, but maintenance time is longer, needs the time of several hours or even several days.
Application number: 201120491601.9 disclose a kind of stable-pressure device, comprising: the first double power supply automatic transfer switch, and it switches between the power supply of two control transformers that high pressure are converted to civil power; The UPS uninterrupted power supply, it is recharged via described the first double power supply automatic transfer switch; The second double power supply automatic transfer switch, it switches between the power supply of the civil power of described the first double power supply automatic transfer switch output and described UPS uninterrupted power supply; Wherein when electrical network was normal, described UPS uninterrupted power supply was in ray mode, and when power network fluctuation, described the second double power supply automatic transfer switch switches to described UPS uninterrupted power supply.The design of stable-pressure device has avoided causing because line voltage is unstable the fluctuation of control loop system voltage to cause equipment problem out of service to a great extent.This stable-pressure device automaticallyes switch by checking the mains voltage signal fluctuation, but switches between the two-way electrical network without obvious cut-off point, will certainly cause two road line voltage parallel operations in handoff procedure, causes most probably the two-way power supply phenomenon that is short-circuited.
The utility model content
The utility model is in order to overcome deficiency of the prior art, a kind of free of discontinuities Switching power is provided, after increasing the free of discontinuities Switching power between UPS and PLC system, has realized the automatic conversion of two-way power supply, guarantee the seamless switching of PLC electric power system, power consumption equipment moves continuously.
The utility model for achieving the above object, be achieved through the following technical solutions, a kind of free of discontinuities Switching power, it is characterized in that: set up automatic transfer equipment and consist of the free of discontinuities Switching power between PLC electric power system and UPS, the input of described automatic transfer equipment is connected with the UPS output, the output of described automatic transfer equipment is connected with PLC electric power system input, and the input of described automatic transfer equipment also directly is connected with the outer power supply source of 220V.
The input of described automatic transfer equipment is connected with outer power supply source with the output of UPS respectively, consists of the electric power system of the using and the reserved.
Described automatic transfer equipment comprises solid-state relay, current transformer, air circuit and binding post, described air circuit passes through the judgement of logical circuit by the current transformer sensed current signal through solid-state relay, to power consumption equipment, described air circuit is connected with power supply through fuse and binding post.
Described automatic transfer equipment is provided with the bypass that power supply is directly caused power consumption equipment.
Be provided with radiator, fan and temperature regulating device around described solid-state relay.
Be the 4-5 millisecond switching time of described automatic transfer equipment.
The logical circuit of described automatic transfer equipment is that power supply passes through the JP0 terminal access rectification circuit by JP6 after transformer pressure-reducing, becomes the stabilized voltage power supply of direct current 5V, gives the power supply of logic card and display floater; The two-way voltage signal of JP6 is given four inputs and a door CD4082 input signal through optocoupler, and simultaneously from JP4 input current fault-signal and excess temperature fault-signal, and 5 and 6 terminals of fault-signal process JP1 are input on panel and show; Through the judgement of logical block CD4082, CD4081, CD4069, two-way voltage signal U1, the U2 of output, 7 and 8 connecting terminals of process JP1 are received on panel and are shown; The appearance value that connects respectively in voltage signal U1, U2 output is the electric capacity of 22uF and 47uF, satisfies the requirement of time 4-5 ms interval when two-way is switched; Four relay K M1, KM2, KM3, KM4 input two-way voltage signal and fault-signal by JP3 to PLC; Two-way voltage signal U1, U2 signal are connected to solid-state relay and control it by JP2 and turn on and off, and can realize telecommunication, remote monitoring and transfer fault message and send the fault buzzer function.
Described automatic transfer equipment is provided with the scram button that can turn-off rapidly power supply.
Alarm when described automatic transfer equipment is provided with fault or changes operating state.
Beneficial effect: in case compared with prior art in the PLC electric power system UPS hardware fault occurs, can make the PLC electric power system accomplish that seamless process switches, and guarantees the even running of PLC system.Not only can retrieve the loss that causes to enterprise due to PLC electric power system dead electricity, can also reduce the operating cost of enterprise.Adopt the PLC system and possess in the system of the formal power supply of two-way, all can adopt the free of discontinuities Switching power to substitute UPS uninterruption power source in the PLC system, making the normal stable operation of power consumption equipment.When hardware fault occured UPS, the PLC electric power system can switch to stand-by power supply in 5 milliseconds.
Description of drawings
Fig. 1 is that circuit of the present utility model connects block diagram;
Fig. 2 is the logical circuitry of automatic transfer equipment;
Fig. 3 is main loop circuit connection layout of the present utility model;
Fig. 4 is panel circuit connection layout of the present utility model.
Embodiment
Below in conjunction with preferred embodiment, details are as follows: embodiment to embodiment that foundation the utility model provides
See accompanying drawing 1-4 for details, a kind of free of discontinuities Switching power, set up automatic transfer equipment and consist of the free of discontinuities Switching power between PLC electric power system and UPS, the input of automatic transfer equipment is connected with the UPS output, the output of automatic transfer equipment is connected with PLC electric power system input, and the input of automatic transfer equipment also directly is connected with the outer power supply source of 220V.Power supply judges by the current transformer sensed current signal by logic through solid-state relay through air circuit, through fuse and binding post to power consumption equipment.Be the 4-5 millisecond switching time of described automatic transfer equipment.
Preferred version of the present utility model is: adopt solid-state relay, be provided with radiator, fan and temperature regulating device around solid-state relay.
Preferred version of the present utility model is: in the situation of UPS power supply commonly used and two power supplys of stand-by power supply, specify the ups power position, its operation sequence is comprised of two automatic transfer processes; Deviation occurs if ups power is detected, automatically load is converted to stand-by power supply from power supply commonly used; If it is normal that ups power recovers, automatically load is returned to changing-over to power supply commonly used.Detected power supply drift: the change of detected power supply characteristic, when power supply characteristic departs from prescribed limits (as the improper change of supply voltage or frequency), the power supply drift that is detected will send signal and make the change over switch action; Accomplish operate time≤5ms. proof load power supply is uninterrupted.
Preferred version of the present utility model is: automatic transfer equipment possesses the function that remote supervisory and control(ling) equipment operation information, fault message and equipment itself send the fault buzzing.
Preferred version of the present utility model is: power supply is directly caused the bypass of power consumption equipment, when the automatic transfer equipment logic breaks down, can isolate rapidly automatic transfer equipment by bypass functionality, power supply is directly caused power consumption equipment.
Preferred version of the present utility model is: when the automatic transfer equipment catastrophic failure, the button that automatic transfer equipment arranges can turn-off rapidly power supply by scram button, the protection power consumption equipment.
Preferred version of the present utility model is: the alarm the when fault that automatic transfer equipment arranges or change operating state.Each change operating state or when breaking down equipment itself can send buzzing, prompting staff checkout equipment ruuning situation.
Operation principle:
See Fig. 1 for details, under normal conditions, city's power supply source is through uninterruption power source (UPS), and output is connected to automatic transfer equipment.Provide stable alternating current 220V output by automatic transfer equipment to the PLC system.Meanwhile, the input of automatic transfer equipment also connects city's power supply source as stand-by power supply.When UPS hardware catastrophic failure causes powering, after automatic transfer equipment detects the dead electricity signal, can automatically switch to stand-by power supply at the 4-5 millisecond, guarantee the seamless switching of PLC electric power system, PLC equipment continuous and steady operation.Be the 4-5 millisecond switching time of automatic transfer equipment, mainly by poor realization discharge time of two different electric capacity of capacity, measure respectively the connection turn-off time of two electric capacity with oscilloscope, difference discharge time that draws two electric capacity is the 4-5 millisecond, is the switching time of automatic transfer equipment.
In addition, automatic transfer equipment also possesses bypass functionality.When the automatic transfer equipment logic breaks down, can isolate rapidly automatic transfer equipment by bypass functionality, power supply is directly caused power consumption equipment.
One, see Fig. 3 for details, the major loop operation principle:
Not with the circuit explanation of bypass functionality
1, city's power supply source and UPS out-put supply are connected to respectively input 1 and input 2 terminal, after the air circuit of two-way, the power supply of input 1 is through the shutoff of solid-state relay 1 and 3 control inputs 1, and the power supply of input 2 is through the shutoff of solid-state relay 2 and 4 control inputs 1.The two-way input source only has one road normal power supply to be connected to power consumption equipment through current transformer and fuse by lead-out terminal provides continuous power supply for it.
2, JP7 directly connects fusible link both sides, and whether the indication fusible link is working properly.
3, after fuse, output circuit and JP4 terminal are provided with the temperature control checkout gear and regulate the fan unlatching according to design temperature.Protect respectively temperature and the line temperature of equipment itself, play the protective effect of forced cooling.
4, the JP0 terminal is that the terminal of power supply is provided for logical circuit and panel circuit.
5, the JP2 terminal is the shutoff of controlling solid-state relay after the logical circuit judgement.
The principle of work and power with bypass:
1, city's power supply source and UPS out-put supply are connected to respectively input 1 and input 2 terminal, after the air circuit of two-way, the power supply of input 1 is through the shutoff of solid-state relay 1 and 3 control inputs 1, and the power supply of input 2 is through the shutoff of solid-state relay 2 and 4 control inputs 1.The two-way input source only has one road normal power supply to be connected to power consumption equipment through current transformer and fuse by lead-out terminal provides continuous power supply for it.
2, solid-state relay can't work when logic breaks down, this moment, working power can't normally be exported, the K3 relay is in power failure state, after pressing the button SB2 of the button SB1 of bypass 1 or bypass 2 this moment, K1 or the conducting of K2 relay are triggered, the indicator light of bypass 1 simultaneously or bypass 2 carries out the work indication, the normally opened contact of K1 or K2 relay is transformed to normally-closed contact, KM1 or the conducting of KM2 contactor, KM1 or KM2 often open, the conversion of normally-closed contact generation state is connected to power consumption equipment by fuse by lead-out terminal provides continuous power supply for it.
3, JP7 directly connects fusible link both sides, and whether the indication fusible link is working properly.
4, after fuse, output circuit and JP4 terminal are provided with the temperature control checkout gear and regulate the fan unlatching according to design temperature.Protect respectively temperature and the line temperature of equipment itself, play the protective effect of forced cooling.
5, the JP0 terminal is that the terminal of power supply is provided for logical circuit and panel circuit.
6, the JP2 terminal is the shutoff of controlling solid-state relay after the logical circuit judgement
7, scram button SB can be manually pressed and power supply and main circuit power cut-out, the normal operation of assurance equipment will be controlled.
Two, see Fig. 2 for details, the logical circuit operation principle
1, power supply is stand-by power supply terminal by JP6(JP5 by the JP0 terminal after transformer pressure-reducing) access rectification circuit, become the stabilized voltage power supply of direct current 5V, give the power supply of logic card and display floater.
2, the two-way voltage signal of JP6 is given four inputs and a door CD4082 input signal through optocoupler, and simultaneously from JP4 input current fault-signal and excess temperature fault-signal, and 5 and 6 terminals of fault-signal process JP1 are input on panel and show.
3, the judgement of process logical block CD4082, CD4081, CD4069, two-way voltage signal U1, the U2 of output, 7 and 8 connecting terminals of process JP1 are received on panel and are shown.
4, the appearance value that connects respectively in voltage signal U1, U2 output is the electric capacity of 22uF and 47uF, satisfies the requirement of time 4-5 ms interval when two-way is switched
5, four relay K M1, KM2, KM3, KM4 input two-way voltage signal and fault-signal by JP3 to PLC.
6, two-way voltage signal U1, U2 signal are connected to solid-state relay and control it by JP2 and turn on and off.
Three, see Fig. 4 for details, the panel circuit operation principle
1,1 of JP1 and 2 terminals directly connect the voltage of transformer output, and connecting luminous diode is power supply indicator.
2,3 of JP1 and 4 terminals are the 5V dc power supply.
3,5 of JP1 with are connected terminal and connect fault input signal, be respectively the indication of overheated indication and overcurrent.
4,7 of JP1 with are connected terminal and connect the two-way voltage signal U1 of logical circuit and the relay indicating light of U2 output, and trigger buzzer when switching, and with mute button.
5, JP7 directly connects fusible link both sides, and whether the indication fusible link is working properly.
The selection of two power supply gapless handover schemes:
Scheme one
Want to accomplish two power supply gaplesss switchings, must UPS and working power is in parallel, just can in parallel work when the frequency of the power supply of these two interchanges, amplitude are all identical, that will change the circuits for triggering of the inversion module of UPS, namely follow working power with the PWM modulation, but have difficult point: (1) needs to use mcu programming, revises former UPS circuit, complex circuit, and UPS is third party producer
Product, even if change smoothly its circuit, the stability after can not guaranteeing to rectify and improve.(2) the two common supply loads of power supply cause unnecessary power loss.When some AC power break down, will produce euqalizing current between two power supplys, thereby the output voltage of two parallel connection power supplies is changed, affect power supply reliability.This scheme is infeasible
Scheme two
Accomplish the seamless switching of PLC electric power system, control its dead electricity time≤5ms.
Not needing or not to modulate working power and UPS output amplitude and frequency with UPS and working power parallel connection yet.
The chief component of PLC electric power system comprises PLC module, auxiliary relay, 24V power supply, air circuit, binding post.
Want to accomplish the seamless switching of PLC electric power system, will guarantee not dead electricity of these elements.
Experiment: below be to use between certain regeneration water factory ozone, between water purification and the stand testing result of each element dead electricity time of the PLC between dosing:
| ? | The PLC module | Auxiliary relay | The 24V power supply | Air circuit | Terminal |
| Between ozone | 24ms | 11ms | 14ms | 0ms | 0ms |
| Between water purification | 22ms | 13ms | 12ms | 0ms | 0ms |
| Between dosing | 27ms | 10ms | 11ms | 0ms | 0ms |
Can find out through above table, there are not the dead electricity situation in air circuit and terminal, and the PLC module can detect the dead electricity situation greater than 22ms the time, and auxiliary relay and 24V power supply can detect the dead electricity situation in the dead electricity time during greater than 10ms.Can learn thus, when ups power breaks down, just can guarantee the continuous firing of PLC electric power system as long as automatic transfer equipment can will be commonly used electrical source exchange to stand-by power supply in 10ms.
For satisfying above-mentioned switching time, the selected of automatic transfer equipment core devices had higher requirement.By the performance of various electronic devices is on the market compared, with solid-state relay as alternative devices.Following table is that used insulated gate bipolar transistor and alternative solid-state relay can be compared the aspect from voltinism:
Insulated gate bipolar transistor (IBGT): be a kind of device that is composited by MOSFET and bipolar transistor, it inputs very MOSFET, exports very PNP transistor.
Advantage: (1) driving power is little; (2) saturation pressure reduces and capacity is large; (3) frequency characteristic between MOSFET and power transistor, can work in tens kHz frequency ranges; (4) static characteristic IGBT mainly has voltage-current characteristic, transfer characteristic and switching characteristic.
Shortcoming: (1) when the HF switch, because switching loss increases, heating aggravation, the use such as lower the temperature when selecting.(2) switch transition speed〉10ms;
Solid-state relay (SSR): be a kind of contactless switch element that is all formed by the solid-state electronic element, he utilizes the point of electronic devices and components, magnetic and light characteristic are completed input and the reliable isolation of exporting, utilize large power triode, power field effect pipe, the switching characteristic of the devices such as individual event controllable silicon and bidirectional triode thyristor reaches contactless, switches on and off to no-spark controlled circuit.
Advantage: (1) high life, highly reliable: SSR does not have component of machine, has solid state device to complete the contact function, can be in HI high impact, work under the environment of vibration, due to the inherent characteristic of the components and parts that form solid-state relay, the life-span that has determined solid-state relay is long, and reliability is high.
(2) highly sensitive, power ratio control is little, and Electro Magnetic Compatibility is good: the input voltage range of solid-state relay is wider, and driving power is low, can need not add buffer or driver with most of logical integrated circuit compatibilities.
(3) conversion fast: solid-state relay is because adopt solid therebetween, so switch speed can be from several milliseconds to several delicate.
(4) electromagnetic interference is few: solid-state relay is input " coil " not, there is no contact striking and rebound, thereby has reduced electromagnetic interference.
Shortcoming: the tube voltage drop after (1) conducting is large, and the forward step-down of controllable silicon or two-phase control silicon can reach 1-2V, and between the saturation pressure slurries calamity 1-2V of high power transistor, also the contact resistance than mechanical contact is large for the conducting resistance of general power field effect pipe.
(2) semiconductor device closes to have no progeny still can have the leakage current of several microamperes to several milliamperes, the electricity isolation that therefore can not realize ideal.
(3) because tube voltage drop is large, the power consumption after conducting and caloric value are also large, and the volume of high power solid state relay is far longer than the electromagnetic relay with capacity, and cost is also higher.
(4) antijamming capability of the temperature characterisitic of electronic devices and components and electronic circuit is relatively poor, and the radiation hardness ability is also relatively poor, and as not adopting an effective measure, functional reliability is low.
(5) solid-state relay is loaded with larger sensitiveness to crossing, and must carry out in protection it with fast acting fuse or RC antihunt circuit.The load of solid-state relay is obviously relevant with ambient temperature, and temperature raises, and load capacity will descend rapidly.
Show through a large amount of experimental studies, these two kinds of electronic components can satisfy work requirements from conversion regime, but are better than IGBT at solid-state relay aspect reaction speed on reaction speed.So selecting fixed relay is the important leverage that realizes that PLC electric power system seamless process switches as automatic transfer equipment.Due to the thermal diffusivity of solid-state relay a little less than, so specially increased strong device for cooling, radiator, fan and temperature regulating device around it in assembling process, guaranteed the efficient operation state of solid-state relay.
For again shortening switching time, proceed test and find, when dropped to 3 milliseconds switching time, the two-way power supply can be short-circuited and cause and can't switch.So it is the preferred plan that realizes that PLC electric power system seamless process switches that the dead electricity time is controlled to be the 4-5 millisecond.
Possesses function
In normal power supply power supply dead electricity situation, before operational outfit detected the dead electricity signal, power supply commonly used switched to rapidly stand-by power supply, guaranteed equipment stable operation.
This equipment possesses duplex feeding power work state, information and the electric current Presentation Functions such as overcurrent warning.
On the basis that possesses the formal power supply of two-way, automatic transfer equipment can substitute traditional UPS uninterruption power source, makes the normal stable operation of power consumption equipment.
The above is only preferred embodiment of the present utility model, is not structure of the present utility model is done any pro forma restriction.Every foundation technical spirit of the present utility model all still belongs in the scope of the technical solution of the utility model any simple modification, equivalent variations and modification that above embodiment does.
Claims (9)
1. free of discontinuities Switching power, it is characterized in that: set up automatic transfer equipment and consist of the free of discontinuities Switching power between PLC electric power system and UPS, the input of described automatic transfer equipment is connected with the UPS output, the output of described automatic transfer equipment is connected with PLC electric power system input, and the input of described automatic transfer equipment also directly is connected with the outer power supply source of 220V.
2. free of discontinuities Switching power according to claim 1, it is characterized in that: the input of described automatic transfer equipment is connected with outer power supply source with the output of UPS respectively, consists of the electric power system of the using and the reserved.
3. free of discontinuities Switching power according to claim 1 and 2, it is characterized in that: described automatic transfer equipment comprises solid-state relay, current transformer, air circuit and binding post, described air circuit passes through the judgement of logical circuit by the current transformer sensed current signal through solid-state relay, to power consumption equipment, described air circuit is connected with power supply through fuse and binding post.
4. free of discontinuities Switching power according to claim 3, it is characterized in that: described automatic transfer equipment is provided with the bypass that power supply is directly caused power consumption equipment.
5. free of discontinuities Switching power according to claim 4, is characterized in that: be provided with radiator, fan and temperature regulating device around described solid-state relay.
6. free of discontinuities Switching power according to claim 5, it is characterized in that: be the 4-5 millisecond switching time of described automatic transfer equipment.
7. free of discontinuities Switching power according to claim 6, it is characterized in that: the logical circuit of described automatic transfer equipment is that power supply passes through the JP0 terminal access rectification circuit by JP6 after transformer pressure-reducing, become the stabilized voltage power supply of direct current 5V, give the power supply of logic card and display floater; The two-way voltage signal of JP6 is given four inputs and a door CD4082 input signal through optocoupler, and simultaneously from JP4 input current fault-signal and excess temperature fault-signal, and 5 and 6 terminals of fault-signal process JP1 are input on panel and show; Through the judgement of logical block CD4082, CD4081, CD4069, two-way voltage signal U1, the U2 of output, 7 and 8 connecting terminals of process JP1 are received on panel and are shown; The appearance value that connects respectively in voltage signal U1, U2 output is the electric capacity of 22uF and 47uF, satisfies the requirement of time 4-5 ms interval when two-way is switched; Four relay K M1, KM2, KM3, KM4 input two-way voltage signal and fault-signal by JP3 to PLC; Two-way voltage signal U1, U2 signal are connected to solid-state relay and control it by JP2 and turn on and off, and can realize telecommunication, remote monitoring and transfer fault message and send the fault buzzer function.
8. free of discontinuities Switching power according to claim 7, it is characterized in that: described automatic transfer equipment is provided with the scram button that can turn-off rapidly power supply.
9. free of discontinuities Switching power according to claim 8, is characterized in that: the alarm when described automatic transfer equipment is provided with fault or changes operating state.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320217469 CN203278382U (en) | 2013-04-26 | 2013-04-26 | Uninterrupted switching power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320217469 CN203278382U (en) | 2013-04-26 | 2013-04-26 | Uninterrupted switching power supply |
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| Publication Number | Publication Date |
|---|---|
| CN203278382U true CN203278382U (en) | 2013-11-06 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 201320217469 Expired - Lifetime CN203278382U (en) | 2013-04-26 | 2013-04-26 | Uninterrupted switching power supply |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104631566A (en) * | 2013-11-14 | 2015-05-20 | 天津市图程新技术有限公司 | Intelligent constant pressure water supply cabinet |
| CN105186681A (en) * | 2015-10-10 | 2015-12-23 | 淄博淄柴新能源有限公司 | Uninterrupted DC power supply system |
-
2013
- 2013-04-26 CN CN 201320217469 patent/CN203278382U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104631566A (en) * | 2013-11-14 | 2015-05-20 | 天津市图程新技术有限公司 | Intelligent constant pressure water supply cabinet |
| CN105186681A (en) * | 2015-10-10 | 2015-12-23 | 淄博淄柴新能源有限公司 | Uninterrupted DC power supply system |
| CN105186681B (en) * | 2015-10-10 | 2018-03-20 | 淄博淄柴新能源有限公司 | Uninterrupted DC power system |
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Granted publication date: 20131106 |