CN101005211A - High frequency emergency power system - Google Patents
High frequency emergency power system Download PDFInfo
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- CN101005211A CN101005211A CNA2007100729882A CN200710072988A CN101005211A CN 101005211 A CN101005211 A CN 101005211A CN A2007100729882 A CNA2007100729882 A CN A2007100729882A CN 200710072988 A CN200710072988 A CN 200710072988A CN 101005211 A CN101005211 A CN 101005211A
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Abstract
Belonging to high frequency inversion technical area of electric grid, the disclosed DC-DC convertor connected between electric supply and load provides high frequency emergency power source with no transformer in line frequency, and using battery in low voltage. Technical characters are: adding a stage of DC-DC convertor between battery and inversion part; controller uses one or more combinations from MCU/DSP/FPGA to constitute digital circuit; real time detecting multiplexing signals of voltage or current, including communication and control panel interfaces. The invention improves stability and precision of AC output power supply. Advantages are: high system efficiency, high power density, good control precision, easy of use and maintenance. Moreover, using high frequency PWM technique and dedicated software, the invention reduces investment on hardware.
Description
Technical field
The invention discloses a kind of DC-DC converter that inserts between civil power and the load, belong to electrical network high-frequency inversion technical field.
Background technology
At present, emergency power supply (EPS) is a kind of supply unit that emergency service can be provided for load when grid cut-off.The emergency power supply form of prior art has multiple, can summarize following two big classes.One class, no power frequency contravariant transformer high frequency emergency power promptly do not adopt transformer, directly battery are partly linked to each other with inversion, see Fig. 1.Advantage system bulk little (not comprising storage battery), loss is little, in light weight, power density is high.Shortcoming needs high tension battery, and the voltage of battery is greater than or equals inverter voltage peak value (as inversion output 220VAC sine, then require direct voltage 310V, reach the waveform requirement to guarantee the inverter voltage peak value).For high-power system, huge investment will be increased.Storage battery belongs to and costs an arm and a leg, easy loss product, and use cost is very high; Moreover high pressure is unfavorable for the intelligent management that discharges and recharges of battery, also is unfavorable for the installation of system, operation and maintenance; Actual product has significant limitation in using.Chinese patent application number 92112088 " high-voltage direct-charged and dc-ac converting emergency power supplies " and China Patent No. 03279726.5 " a kind of Multifunction emergency power system ", the disclosed emergency power supply type that belongs to no power frequency contravariant transformer.Still need the high-tension battery group to provide inversion needed DC source.Fig. 1 is a concrete inversion partial circuit figure: feature: battery directly links to each other with the inversion part, and cell voltage is greater than or equal to the crest voltage of inversion output.
The emergency power system of second class, employing Industrial Frequency Transformer is seen Fig. 2.Adopt Industrial Frequency Transformer, battery pack quantity and the magnitude of voltage and the first kind do not have power frequency contravariant transformer high frequency emergency power system compare to some extent and reduce (as: inversion 220VAC, battery pack can be selected 12VDC, 24VDC, 48VDC).But the inversion of this system output needs an Industrial Frequency Transformer, and the alternating current that is directly produced by the battery inversion is transformed into the needed alternating current of load (as 110V, 220V).The Industrial Frequency Transformer volume is big, the cost height, and power consumption is big, structural design and installation production requirement height, final self-contained volume is big, weight big, installation and transportation are all very inconvenient.See China Patent No. 02285217.4 " three phase emergency power source " disclosed be that battery pack directly is connected with inverter, output connects the emergency power system of Industrial Frequency Transformer.
Summary of the invention
Through above analysis, prior art is directly as the DC source of inversion, under emergent inversion power supply state with storage battery, battery constantly discharges, can cause cell voltage to reduce, the inverter output voltage distortion factor is big, is not suitable for the demanding occasion of alternating voltage ripple coefficient.
The purpose of this invention is to provide a kind of no industrial frequency transformer and use the high frequency emergency power of A-battery, adopt high-frequency pulsed width modulation PWM to improve and exchange out-put supply, when the AC power electrical network is unusual, switch to inversion system output rapidly, for load provides high-precision alternating current; Under the electrical network normal condition, AC power directly is an electric.
The technical solution that proposes according to the present invention is: a kind of high frequency emergency power device, comprise city's electrical switching device, its major technique characteristics are to have added the one-level DC-DC converter between battery and inversion part, the control section of numerical control system is controlled each high-frequency converter by software program; Detect plurality of voltages, current signal in real time, comprise communication interface and control panel interface.
Technical solution according to the present invention's proposition: DC-DC converter is a push-pull converter, comprise switch element S11, S12, high frequency transformer TX11, diode D11-D14 rectifier bridge and LC filter comprise inductance, electric capacity L11, C11 and L12, C12.DC-DC converter will be transformed into direct current and be input to inverter from the direct current of battery, carry out the DC-AC conversion; Charger is transformed into direct current with AC power, charges the battery; Inverter is transformed into alternating current output with the direct current of DC-DC converter output.
The control device of present technique solution comprises: checkout gear, controller and drive unit; The charger input connects AC power, and output connects battery; The DC-DC converter input connects battery, and output connects electric capacity; The inverter input connects electric capacity, and output connects the output switching device shifter and promptly exports switch.
Controller adopts the one or more digital circuits that constitute among the MCU/DSP/FPGA.
The detection signal of control device comprises in the high-frequency converter of present technique solution: input signal: the voltage u_ac of AC power, current i _ the chrg of charger, the voltage u_bat of battery, the voltage u_bus of electric capacity, current i _ the inv of inverter and voltage u_inv, output drive signal comprises: the pulse width modulation CHRG_PWM of control switch element in the charger, the pulse width modulation DCDC_PWM of switch element in the DC-DC converter, the pulse width modulating signal INV_PWM of switch element in the inverter.The checkout gear of control device detects voltage, electric current in real time in the present technique solution, and send into controller and handle, by drive unit, send three group pulse bandwidth modulation signals PWM, drive the switch element in charger, DC-DC converter, the inverter.Checkout gear detects electric capacity+u_bus,-u_bus voltage signal, via controller is handled, export one group of DCDC_PWM drive signal by drive unit, the turn-on and turn-off of difference control switch element S11, S12, the direct current of battery is transformed into high-frequency alternating current,, is transformed into direct current and exports to inverter 3 and carry out the DC-AC conversion by transformer TX11, D11-D14 rectifier bridge, LC filter.
The technical solution that the present invention proposes, control device is controlled by software program, and the major function of realization comprises: controller starts, and detectable voltage signals u-ac calculates the magnitude of voltage of u-ac and the frequency values of calculating u-ac respectively; Judge AC power: if AC power is normal, start charger, switch to the AC power end by the output switch; If AC power is undesired, then start DC-DC converter and inverter, controller control output switch switches to inverter output end.
Good effect of the present invention: improved interchange out-put supply stability and precision.The system effectiveness height, the power density height, control precision is good, installs and uses and safeguard facility.Especially use DC-DC converter, the cancellation Industrial Frequency Transformer, the coupling A-battery, smaller volume, in light weight, cost is low.Adopt high-frequency pulsed width modulation PWM technology and special-purpose software, reduced hardware investment.
Description of drawings
Fig. 1, be no power frequency contravariant transformer high frequency emergency power, known technology.
Fig. 2, be the DC source emergency power supply that adopts the power frequency contravariant transformer, known technology.
Fig. 3, be structural principle block diagram of the present invention.
Fig. 4, be the schematic diagram of charger 1 among Fig. 3.
Fig. 5, be the schematic diagram of DC-DC converter 2 among Fig. 3.
Fig. 6, be the schematic diagram of inverter 3 among Fig. 3.
Fig. 7, be the schematic diagram of control device 7 among Fig. 3.
Fig. 8, be the invention flow chart.
Fig. 9, be the inventive embodiment schematic diagram.
Further specify difference with the prior art of the present invention below in conjunction with structural principle block diagram 3 of the present invention and see accompanying drawing 1,2 (the scape technology of passing away repeats no more) herein.Among Fig. 3, charger 1 is transformed into direct current with AC power, and battery 4 is charged.DC-DC converter 2 is transformed into inverter 3 with the direct current of battery 4 and carries out the required direct current of DC-AC conversion for inverter 3.Inverter 3 is transformed into alternating current, supply load with the direct current of DC-DC converter 2 outputs.Battery 4, AC power just often, the charging energy storage; When AC power is unusual, for DC-DC converter 2 provides direct current.Electric capacity 5 is energy storage devices, the direct current of storage DC-DC converter 2 outputs, needed direct current when providing inversion for inverter 3.Output switch 6, when AC power just often, switch to AC power output, powering load; When AC power is unusual, switch to the output of inverter 3, be electric.Control device 7 detects voltage, electric current, output PWM drive signal.AC power is meant the AC power outage unusually, or AC supply voltage, frequency etc. exceed the unacceptable situation of setting range even load.Charger 1 input connects AC power, output termination battery 4; DC-DC converter 2 input termination batteries 4, output termination capacitor 5; Inverter 3 inputs connect electric capacity 5, and output connects output switch 6; Control device 7 comprises checkout gear, controller and drive unit.The input detection signal of control device 7 is seen the above (repeating no more).Output drive signal: CHRG_PWM (the PWM drive signal of switch element in the charger 1), DCDC_PWM (the PWM drive signal of switch element in the DC-DC converter 2), INV_PWM (the PWM drive signal of switch element in the inverter 3).
The maximum difference of the present invention and prior art is to have added the one-level DC-DC converter between battery and the inversion part, realized that emergency power supply unit need not erector's frequency power transformer, and cell voltage need not the crest voltage more than or equal to inverter output AC electricity.Battery need not decided by inverter voltage, and with lower DC power supply (as 12V, 24V, 48V etc.), the battery pack of actual disposition can significantly reduce, and makes the user buy investment and cost of use reduces greatly.
See Fig. 3 to Fig. 7, describe in detail one by one.
Charger 1:
See Fig. 4 and Fig. 9, adopt inverse-excitation type (flyback) converter, diode D1-D4 constitutes rectifier bridge, through the DC chopped-wave of capacitor C1 filtering, switch element S1 and high frequency transformer TX1 formation, by D5, C2 rectifying and wave-filtering, output DC.
DC-DC converter 2:
See Fig. 5 and Fig. 9, adopt push-pull type (push-pull) converter, comprising: switch element S11, S12, high frequency transformer TX11, D11-D14 rectifier bridge and LC filter, L inductance are that L11-L12 and C electric capacity are C11-C12, wherein capacitor C 11 and C12 are the electric capacity 5 in the block diagram 3.
Inverter 3:
See Fig. 6 and Fig. 9, adopt half-bridge (half-bridge) converter, backward diode D21, D22 on switch element S21, the S22 constitute the LC filter by L21 and C21, and C electric capacity is C11 and C12 (electric capacity 5 in the block diagram 3).Control device 7 detects u_inv (inverter 3 output voltages) and i_inv (flowing through the electric current of inversion inductance L 1), handles through controller, then by drive unit output PWM drive signal: INV_PWM.The INV_PWM drive signal is the turn-on and turn-off of control switch element S21, S22 respectively, and the dc inverter that DC-DC converter 2 is exported becomes high-frequency alternating current, is filtered into the sine wave alternating current supply load through L21 and C21.This group drive signal is made up of two drive signals, controls S21, S22 respectively.Control device detects u_inv, i_inv, and according to the setting reference value of controller inside, the pulse duration of control INV_PWM makes the ON time of S21 and S22 change, and is stable to realize the output inverter voltage, meets design requirement.Can set inverter output voltage in real time as required, as 200VAC, 220VAC, 240VAC, 50Hz/60Hz etc.
Output switch 6:
See Fig. 3 and Fig. 9, this output switch 6 is by MCU (or digital logical operation circuit) output I/O port controlling, one group of logic control sequential (can be a program, the computing of digital logical operation circuit etc.) judge according to the AC power criterion that configures: as assert in the 220V system, the grid alternating current source of 170～260VAC, load can be carried out logic determines to detected AC power, if conformance with standard, then MCU (or digital logical operation circuit) drives output switch 6 to the AC power end, by the AC power powering load, if the standard of not meeting, then MCU (or digital logical operation circuit) drives output switch 6 to inverter output end, by inverter 3 powering loads.
Control device 7:
See Fig. 7 and Fig. 9, control device 7 is a core with the MCU/DSP/FPGA digital circuit, add that peripheral circuit constitutes, comprise checkout gear, controller, drive unit, communication interface and control panel interface, this control panel can constitute by LED/LCD is one or more.
Checkout gear detects voltage, electric current in real time, and sends into controller and handle, and controller is according to operational mode, the parameter set, each converter is controlled, by drive unit, send three groups of PWM, drive the switch element in charger 1, DC-DC converter 2 and the inverter 3.Controller comprises control panel interface and communication interface.The voltage signal u_bus that detects electric capacity 5 (is divided into :+u_bus,-u_bus), after the controller processing, drive unit output high-frequency PWM drive signal DCDC_PWM is the turn-on and turn-off of control switch element S11, S12 respectively, the direct current of battery 4 is transformed into high-frequency alternating current, by high frequency transformer TX11 conversion, through the D11-D14 rectifier bridge, LC filtering (L11, C11 and L12, C12) is reverse into direct current and exports to inverter 3.Inverter: can be 110VAC/220VAC, 50/60Hz or non-work frequency, three equate; Power output: by hundreds of to tens kilovolt-ampere; Battery 12V, 48V, 96V etc.
Control device 7 detects battery 4 voltage u_bat and charger 1 chopper current i_chrg, after the controller processing, by drive unit output pulse-modulated signal CHRG_PWM, drive the turn-on and turn-off of the control switch element S1 of charger 1, the rectifying and wave-filtering of the conversion of TX1 and D5, C2, direct current behind D1-D4 rectification, C1 rectifying and wave-filtering is transformed into another direct current, and this direct current is to battery 4 chargings.Worth explanation is, control device detects the positive/negative voltage signal+u_bus of electric capacity 5,-u_bus, controller can be according to the reference value of inner setting, the pulse duration of control DCDC_PWM drive signal, make the turn-off time of opening of S11 and S12 change, to realize the voltage+u_bus of electric capacity 5 ,-u_bus is stabilized in the design objective, as inversion output 220VAC, then+and u_bus can be set at 320VDC, and-u_bus can be set at-320VDC.Change the setting reference value of controller inside, just can change+u_bus the magnitude of voltage of-u_bus.Be changed to 240VAC as inversion output from 220VAC, then controller is understood general+u_bus automatically, and the set point of-u_bus becomes 350VDC ,-350VDC.
Following detailed description work: control device 7 detects ac supply signal u_ac, adds computerized algorithm through the controller of control device 7, judges that normally whether AC power.If normal, then detect the current signal i_chrg of charger 1 and the voltage signal u_bat of battery 4, by the defeated pulse-modulated signal CHRG_PWM of drive unit, the switch element S1 of control charger 1.4 chargings of 1 pair of battery of charger, output switch 6 switches to the AC power end, by the AC power powering load.
When AC power was unusual, control device 7 detected ac supply signal u_ac (voltage effective value detects, the frequency detecting scheduling algorithm) and is judged as unusually, and drive unit stops to export CHRG_PWM, and charge closing device 1 starts DC-DC converter 2 and inverter 3.The direct current of battery 4 is transformed into alternating current consistent with AC power (or the output AC electricity of inverter 3 is by controller inner setting) through inverter 3, and output switch 6 switches in inverter output end, by inverter 3 powering loads.In the practical application, the detection of 7 couples of u_bat of control device, according to the charging voltage reference value of controller inner setting, the pulse duration of control CHRG_PWM is to realize the function of constant voltage charge; The detection of 7 couples of i_chrg of control device, according to the setting of controller, the pulse duration of control CHRG_PWM is to realize the charge function of constant current.
Control system of the present invention mainly is to realize controlling by the variable signal that detects battery 4 and inverter 3.Checkout gear also can be by detecting the pulse duration of controlling and driving signal DCDC_PWM (drive signal of switch element in the DC-DC converter 2), thereby make the output DC of DC-DC converter 2 satisfy the input requirement of inverter 3.
In like manner, detect the signal u_inv of inverter 3, i_inv, 3 outputs of output driving pulse width signal INV_PWM control inverter.
See Fig. 8, workflow of the present invention:
Control method, the operating procedure of being controlled by software program comprises:
The signal enabling control unit
Detection signal
Computing unit calculate u-ac magnitude of voltage and
Computing unit calculates the frequency values of u-ac
Judge AC power normally whether
Be, start charger, switch to the AC power end by the output switch;
Not, start DC-DC converter and inverter, controller control output switch switches to inverter output end.
Embodiment
Example 1:
Expression major part of the present invention in the accompanying drawing 9, frame of broken lines.
The emergency power system switch element S that connects between load and the AC power can adopt IGBT (Insulated-gate Bipolar Transistor), full control property such as MOSFET (Metal Oxide Semiconductor FieldEffect Transistor mos field effect transistor) switching device.With output 220V/50Hz, 1KVA, battery 36V are example, and the model of element: S11 adopts two IRF3710 (MOSFET) parallel connection, and S12 adopts two IRF3710 parallel connections; D11-D14 adopts RHRP8120 (Power Diode Pumped); S21, S22 adopt IGBT HGTG11N120 series.Output switch 6 adopts relay (high-power output need add Static Transfer Switch STS); C11, C12 electrochemical capacitor 470uF.Controller is microcontroller MCU, FREESCALE MR series, and this controller has high-performance kernel CPU, output pulse modulation PWM.Peripheral circuit comprises circuit such as sampling (current sensor, voltage sensor etc.), signal modulation, output driving.Cooperate peripheral power supply IC (384x, 3525) and drive circuit by controller MCU, output pulse modulation pwm signal driving switch element S.
The invention is not restricted to above embodiment, identical or simple replacement of content every and of the present invention etc. all belongs within the protection range of claim of the present invention.
Claims (10)
1, a kind of high frequency emergency power system comprises city's electrical switching device, it is characterized in that: added the one-level DC-DC converter between battery and inversion part, the control section of numerical control system is controlled by software program
Each high-frequency converter;
Detect plurality of voltages, current signal in real time, comprise communication and control panel interface.
2, a kind of high frequency emergency power system according to claim 1 is characterized in that DC-DC converter will be transformed into direct current from the direct current of battery, is input to inverter and carries out the DC-AC conversion, is reverse into alternating current, supply load; Charger is transformed into direct current with AC power, charges the battery.
3, a kind of high frequency emergency power system according to claim 1 and 2 is characterized in that control device comprises checkout gear, controller and drive unit; The charger input connects AC power, and output connects battery; The DC-DC converter input connects battery, and output connects electric capacity; The inverter input connects electric capacity, and output connects the output switching device shifter.
4, a kind of high frequency emergency power system according to claim 3, it is characterized in that said DC-DC converter is a push-pull converter, comprise switch element S11, S12, high frequency transformer TX11, the LC that diode D11-D14 rectifier bridge and inductance, electric capacity constitute.
5, a kind of high frequency emergency power system according to claim 3 is characterized in that said controller adopts the one or more digital circuits that constitute among the microcontroller MCU/DSP/FPGA.
6, a kind of high frequency emergency power system according to claim 1 is characterized in that the detection signal of said control device comprises:
Input signal:
The voltage u_ac of AC power,
Current i _ the chrg of charger,
The voltage u_bat of battery,
The voltage u_bus of electric capacity,
The electric current of inverter, voltage: i_inv, u_inv,
Output drive signal comprises:
The pulse width modulating signal CHRG_PWM of switch element in the charger,
The pulse width modulating signal DCDC_PWM of switch element in the DC-DC converter,
The pulse width modulating signal INV_PWM of switch element in the inverter.
7, a kind of high frequency emergency power system according to claim 6, it is characterized in that said checkout gear detects voltage, electric current in real time, and send into controller and handle, pass through drive unit, send three groups of pwm signals, drive the switch element in charger, DC-DC converter, the inverter.
8, a kind of high frequency emergency power system according to claim 7, it is characterized in that said checkout gear detect electric capacity+u_bus,-u_bus voltage signal, via controller is handled, and exports one group of DCDC_PWM drive signal by drive unit, the turn-on and turn-off of difference control switch element S11, S12, the direct current of battery is transformed into high-frequency alternating current, by TX11, the D11-D14 rectifier bridge, LC filter transform output DC is for inverter 3 inversion output ACs.
9, a kind of high frequency emergency power system according to claim 1 is characterized in that exporting switching device shifter in the said high-frequency converter, when AC power just often, switch to AC power and output to load; When AC power is unusual, switch to the output of inverter, be electric.
10, a kind of control method of high frequency emergency power system is characterized in that being comprised by the operating procedure of software program control:
The signal enabling control unit
Detection signal
Computing unit calculate u-ac magnitude of voltage and
Computing unit calculates the frequency values of u-ac
Judge AC power normally whether
Be, start charger, switch to the AC power end by the output switching device shifter;
Not, start DC-DC converter and inverter, controller control output switching device shifter switches to inverter output end.
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| Application Number | Priority Date | Filing Date | Title |
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| CNA2007100729882A CN101005211A (en) | 2007-01-18 | 2007-01-18 | High frequency emergency power system |
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| CNA2007100729882A CN101005211A (en) | 2007-01-18 | 2007-01-18 | High frequency emergency power system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101577496A (en) * | 2009-03-24 | 2009-11-11 | 成都大殷电器科技有限公司 | Industrial frequency transformer |
| CN101909390A (en) * | 2010-07-30 | 2010-12-08 | 深圳市桑达实业股份有限公司 | Constant-voltage power circuit with power factor correction (PFC) and light-emitting diode (LED) street lamp |
| CN102457101A (en) * | 2010-10-28 | 2012-05-16 | 珠海银通新能源有限公司 | Battery backup supply unit |
| CN103312025A (en) * | 2012-03-12 | 2013-09-18 | 北京倍肯恒业科技发展有限责任公司 | Intelligent power supply control system |
| CN103441569A (en) * | 2013-09-10 | 2013-12-11 | 国家电网公司 | Device and method for monitoring electrical network voltage instant jittering |
| CN101983475B (en) * | 2009-03-10 | 2014-01-22 | 株式会社三社电机制作所 | Inverter circuit |
| CN103683442A (en) * | 2013-09-11 | 2014-03-26 | 合肥联信电源有限公司 | An emergency power supply device with an independent safe voltage and a working method thereof |
| CN103730895A (en) * | 2013-12-31 | 2014-04-16 | 东北大学 | Bypass type 220V power grid electric dazzling prevention device and control method thereof |
| CN103904707A (en) * | 2012-12-24 | 2014-07-02 | 硕天科技股份有限公司 | Uninterrupted power supply system provided with energy feedback chargers and capable of outputting sine waves |
| CN104852431A (en) * | 2015-06-25 | 2015-08-19 | 北京中恒锐创电气有限公司 | UPS power supply control system and control method thereof |
| CN105404416A (en) * | 2015-10-23 | 2016-03-16 | 广东欧珀移动通信有限公司 | Anti-interference method and apparatus for touch screen |
| CN106253645A (en) * | 2016-08-31 | 2016-12-21 | 深圳市英朗光电有限公司 | Emergency Lighting Supply power inverter |
| CN109660014A (en) * | 2019-01-10 | 2019-04-19 | 广东志成冠军集团有限公司 | A kind of integrated energy storage type MW class uninterruptible power system |
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| CN101983475B (en) * | 2009-03-10 | 2014-01-22 | 株式会社三社电机制作所 | Inverter circuit |
| CN101577496A (en) * | 2009-03-24 | 2009-11-11 | 成都大殷电器科技有限公司 | Industrial frequency transformer |
| CN101909390A (en) * | 2010-07-30 | 2010-12-08 | 深圳市桑达实业股份有限公司 | Constant-voltage power circuit with power factor correction (PFC) and light-emitting diode (LED) street lamp |
| CN101909390B (en) * | 2010-07-30 | 2013-06-19 | 深圳市桑达实业股份有限公司 | Constant-voltage power circuit with power factor correction (PFC) and light-emitting diode (LED) street lamp |
| CN102457101A (en) * | 2010-10-28 | 2012-05-16 | 珠海银通新能源有限公司 | Battery backup supply unit |
| CN103312025A (en) * | 2012-03-12 | 2013-09-18 | 北京倍肯恒业科技发展有限责任公司 | Intelligent power supply control system |
| CN103904707A (en) * | 2012-12-24 | 2014-07-02 | 硕天科技股份有限公司 | Uninterrupted power supply system provided with energy feedback chargers and capable of outputting sine waves |
| CN103441569B (en) * | 2013-09-10 | 2016-01-20 | 国家电网公司 | A kind of supervising device of line voltage instant jitter and method |
| CN103441569A (en) * | 2013-09-10 | 2013-12-11 | 国家电网公司 | Device and method for monitoring electrical network voltage instant jittering |
| CN103683442A (en) * | 2013-09-11 | 2014-03-26 | 合肥联信电源有限公司 | An emergency power supply device with an independent safe voltage and a working method thereof |
| CN103730895A (en) * | 2013-12-31 | 2014-04-16 | 东北大学 | Bypass type 220V power grid electric dazzling prevention device and control method thereof |
| CN104852431A (en) * | 2015-06-25 | 2015-08-19 | 北京中恒锐创电气有限公司 | UPS power supply control system and control method thereof |
| CN105404416A (en) * | 2015-10-23 | 2016-03-16 | 广东欧珀移动通信有限公司 | Anti-interference method and apparatus for touch screen |
| CN105404416B (en) * | 2015-10-23 | 2018-01-19 | 广东欧珀移动通信有限公司 | Touch-screen anti-disturbance method and device |
| CN106253645A (en) * | 2016-08-31 | 2016-12-21 | 深圳市英朗光电有限公司 | Emergency Lighting Supply power inverter |
| CN106253645B (en) * | 2016-08-31 | 2019-02-05 | 深圳市英朗光电有限公司 | Emergency Lighting Supply power inverter |
| CN109660014A (en) * | 2019-01-10 | 2019-04-19 | 广东志成冠军集团有限公司 | A kind of integrated energy storage type MW class uninterruptible power system |
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