CN201160259Y - Digitized inverter - Google Patents
Digitized inverter Download PDFInfo
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- CN201160259Y CN201160259Y CNU2008200164942U CN200820016494U CN201160259Y CN 201160259 Y CN201160259 Y CN 201160259Y CN U2008200164942 U CNU2008200164942 U CN U2008200164942U CN 200820016494 U CN200820016494 U CN 200820016494U CN 201160259 Y CN201160259 Y CN 201160259Y
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Abstract
The utility model discloses a digital inverter comprises an inverter bridge, and the inverter bridge is composed of IGBT; the input end of the digital inverter is connected with a DC bus; an off controller of the digital inverter is connected with the pulse signal output end of a processor; the direct current on the DC bus can be inverted and generated into alternating voltage for being output under the control action of the processor; the alternating voltage is connected with an alternating current power output end through a boost filter circuit, and the output signal is fed back to the processor by the signal detection and level switching circuits. The digital inverter has the advantages that: the design idea that the inverter circuit is arranged by adopted the prior transducer is abandoned, and a novel inverter circuit structure is put forward, thereby the hardware circuit can be simplified and the hardware cost can be reduced; moreover, the reliability of the control system is enhanced and the standardization can be realized easily; a unified control circuit board can be used for different systems. Furthermore, the digital inverter also has the advantages of stable output voltage, good consistency of system, flexible control and convenient manufacturing.
Description
Technical field
The utility model belongs to the inverter technology field, specifically, relates to a kind of improvement that is applied to the inverter circuit in the emergency power system.
Background technology
Emergency power system EPS (Emergency Power Supply) is widely used in fire-fighting, field such as recover, inverter as its core generally adopts frequency converter to realize at present, have the following disadvantages thus: 1, because frequency converter is open loop output, there is not Voltage Feedback, therefore can't guarantee the stable of emergency power system output voltage, thereby be difficult to bear the task that Alternating Current Power Supply is provided for the higher load of power reguirements, so just limited the application of emergency power system; 2, can not be synchronous with civil power, thus can not between civil power and inversion, switch fast; 3, emergency power system the time is to power by its inner batteries in work, batteries output be direct voltage, and frequency converter need exchange input, this makes wiring in the emergency power system quite trouble that becomes, cost is higher; 4, adopt frequency converter as inverter in emergency power system, its parameter is provided with cumbersome, has had a strong impact on development efficiency, and the stability of system's operation also can not get ensureing.
Based on above reason, how to design a special inverter that is applicable to emergency power system, with alternative existing frequency converter, and then overcome above defective, be technical problem underlying to be solved in the utility model.
The utility model content
The purpose of this utility model is to provide a kind of brand-new inverter circuit, to solve the existing frequency converter design output voltage instability that inverter circuit was brought, wiring complexity, the problem that cost is high of adopting, thereby guaranteed the stable of emergency power system output voltage, improved reliability of system operation.
For solving the problems of the technologies described above, the utility model is achieved by the following technical solutions:
A kind of digitlization inverter, comprise the inverter bridge of forming by the IGBT pipe, its input connects dc bus, the break-make control end connects the pulse signal output end of a processor, under the control action of described processor the direct voltage inversion on the dc bus being generated alternating voltage exports, and then connect ac power output through the filter circuit that boosts, and by input and level shifting circuit feedback loop output signal to described processor.
Wherein, the voltage on the described dc bus is provided by batteries, and the input of described batteries connects ac power input end by current rectifying and wave filtering circuit, and the dc voltage output end of batteries connects described dc bus.
Further, in described inverter, include a system power supply module, its input connects described dc bus, and the dc low-voltage that the high direct voltage that receives is converted to multiple current potential is exported, for the functional circuit in the inverter provides work required DC power supply.
In order to improve the driving force of described processor output pulse signal, in the utility model, the pulse signal output end of described processor connects the break-make control end of described inverter bridge by optical couple isolation drive circuit.Wherein, in described optical couple isolation drive circuit, include comparator, switching circuit and the optocoupler that is connected with described switching circuit; The wherein pulse signal output end of one road input connection processing device of described comparator, another road input connects reference voltage, and output connects the control end of described switching circuit; On off operating mode by changing described switching circuit to be controlling the break-make of described optocoupler, and then the output by described optocoupler is to the break-make control end output pulse signal of inverter bridge.
For corresponding urgent telegram source circuit is protected; in described emergency power supply, also include the dc bus over-current detection unit; output short-circuit detecting unit and/or the too high detecting unit of inverter temperature; its detection signal output connects the input of a programmable logic device; generate guard signal by described programmable logic device and export described processor to; output with the pulse signal output end that blocks processor; and then at emergency power supply overcurrent appears; the control inverter unit quit work when short circuit or temperature were crossed high fault, to avoid corresponding urgent telegram to be derived from body and external loading causes damage.
Further again, including ac voltage signal in described input and level shifting circuit detects and level conversion unit, its input connects described ac power output, alternating voltage to its output is sampled, and by level shifting circuit bipolar signal is converted to wherein one tunnel analog-to-digital conversion input that unipolar signal exports described processor to.The detection signal that the processor basis receives is to adjust the duty ratio of its output pulse signal, to guarantee the stable of inverter unit output voltage.
In addition, also including d. c. voltage signal in described input and level shifting circuit detects and level conversion unit, its input connects wherein one road dc power output end of described system power supply module, exports another road analog-to-digital conversion input of described processor behind decompression transformation to.
Further again, also including current signal in described input and level shifting circuit detects and level conversion unit, wherein, in the current signal detecting unit, include current sensor, the electric current of described ac power input end input, the electric current of ac power output output or the charge/discharge current of batteries are gathered, after carrying out the current-voltage conversion, export the analog-to-digital conversion input of described processor to through level shifting circuit.
Preferably, described processor preferably adopts the DSP digital signal processor to realize.
Compared with prior art, advantage of the present utility model and good effect are: digitlization inverter of the present utility model is abandoned and is adopted existing frequency converter to set up the design philosophy of inverter circuit, a kind of brand-new inverter circuit structure has been proposed, not only simplified hardware circuit, reduced hardware cost, and the raising of the reliability of control system, be easy to standardization, can adopt unified control circuit board at different systems, get final product and just Control Software is done some adjustment; Effectively guaranteed the stable of output voltage, the high conformity of system, control is manufactured conveniently flexibly.
After reading the detailed description of the utility model execution mode in conjunction with the accompanying drawings, other characteristics of the present utility model and advantage will become clearer.
Description of drawings
Fig. 1 is the emergency power system overall structure schematic diagram that adopts the inverter that the utility model proposed;
Fig. 2 is the schematic block circuit diagram of Fig. 1;
Fig. 3 is the circuit theory diagrams of inverter bridge among Fig. 2;
Fig. 4 is the theory diagram of processor and peripheral circuit thereof among Fig. 2;
Fig. 5 is the schematic diagram of optical couple isolation drive circuit among Fig. 2;
Fig. 6 is the theory diagram of programmable logic device and peripheral circuit thereof among Fig. 4.
Embodiment
Below in conjunction with accompanying drawing embodiment of the present utility model is described in detail.
Present embodiment is the circuit structure of the example digitlization inverter of specifically setting forth the utility model and being proposed with emergency power system EPS.Referring to shown in Figure 1, the emergency power system EPS of present embodiment mainly by ac power input end Vin, charger unit, batteries, inverter, throw device mutually and several parts of ac power output Vout are formed.Wherein, in described mutual throwing device, include double switch K1, K2, one way switch K1 is connected between the ac power input end Vin and ac power output Vout of emergency power supply, when emergency power supply connects the external communication civil power, can select this way switch conducting, and then directly provide Alternating Current Power Supply, and need not move the treatment circuit of emergency power supply inside to load by outside civil power; Meanwhile, can also utilize the outside electric main of introducing that the batteries in the emergency power system is charged, use treating in the future; Another way switch K2 is connected between inverter and the ac power output Vout, when emergency power supply breaks away from outside civil power when working alone, should select this way switch conducting, and then the electric weight that utilizes batteries to store provides operating voltage to inverter, the high voltage direct current inversion of batteries output is generated the required High Level AC Voltage output of load, to provide working power to load.
Consider that the load that is connected with emergency power supply mostly needs three-phase alternating-current supply, therefore, in the emergency power system of present embodiment, ac power input end V in is designed to the three-phase input, ac power output Vout is designed to three-phase output, with being connected of convenient and external loading.
For emergency power system, inverter is the core of whole system design, adopt the frequency converter design many disadvantages that inverter brought in order to overcome existing emergency power supply, present embodiment has proposed the EPS special inverter control system based on digital signal processor DSP (Digital Singnal Processor), simplify hardware circuit, improved the reliability of power-supply system.Fig. 2 is the schematic block circuit diagram of digitlization emergency power system, wherein, charger unit adopts current rectifying and wave filtering circuit to form, it is battery charging that the external communication commercial power rectification of introducing is filtered into direct current, and rectification circuit wherein can adopt not implemented in many forms such as control rectifier, phase controlled rectifier, PWM rectifier.Externally civil power work is interrupted or when undesired, the high voltage direct current of batteries output provides stable direct current supply by DC filter (such as the LC filter circuit) to inverter.In the emergency power system of present embodiment, as the inverter of core by function can mainly divide for the inversion unit formed by inverter bridge and optical couple isolation drive circuit, the inversion output unit formed by contravariant transformer and filter circuit, the Detection ﹠ Controling unit of forming by parameter detecting circuit and processor and provide the power pack of low-voltage DC for each functional unit in the inverter unit.Wherein, inversion unit and inversion output unit have been formed the power cell of digitlization EPS special inverter, have also constituted the controlling object of system.Power pack adopts switch transformer to realize, its input connects the dc voltage output end of batteries, power transformer is sent in the high direct voltage input produce the output of multichannel low-voltage dc power supply behind switch change-over, in the present embodiment, concrete 9 road low-voltage DCs: 24V, 12V, 5V and 6 road 22V of producing are with thinking that each functional circuit in the inverter provides work required DC power supply.
Respectively the particular circuit configurations of each functional unit in the inverter is done further detailed elaboration below.
Referring to shown in Figure 3, Fig. 3 has enumerated wherein a kind of circuit composition form of inverter bridge and inversion output unit, wherein, the full-bridge three phase inverter bridge that inverter bridge is made up of 6 insulated gate bipolar power tubes (IGBT pipe) IGBT1～IGBT6, be connected between the dc bus, be V0+, between the V0-two ends, the pulse signal that its break-make control end (being grid) receiving processor sends, it specifically can be the pwm signal of processor output, under its control action, the direct voltage inversion on the dc bus is generated the SVPWM waveform voltage, then by the three phase power transformer boost handle after, after the LC filter circuit shaping via inductance L 1～L3 and capacitor C 7～C9 composition, forming line voltage is the three phase sine alternating voltage Va of 380V, Vb, Vc output is for external loading provides the three-phase alternating current power supply.
Wherein, described DC bus-bar voltage is provided by batteries.The effect that is connected in parallel on the RC circuit between IGBT pipe IGBT1～IGBT6 collector electrode and the emitter is to reduce electric current and voltage to the impact of IGBT pipe itself and custom-designed from the process that is conducting to shutoff at the IGBT pipe.Described power transformer can adopt the three-phase inversion transformer to realize.
Fig. 4 is the catenation principle block diagram of described processor and peripheral circuit thereof.Wherein, the model that can select TI (TexasInstruments) company to produce is that the dsp chip of TMS320LF2407A is as main control chip, it is that TI company aims at fields such as Electric Machine Control, UPS and the digital control chip that designs, having high speed signal handles and the necessary design feature of digital control function, the interior peripheral hardware of sheet that also has multiple realization specific function, as event manager module, A/D modular converter, SPI, SCI and CAN communication control interface etc.Be connected with circuit modules such as input and level shifting circuit, RS485 communication interface, programmable logic device (CPLD) in described dsp processor periphery.
Consider the safety of the stable of emergency power system output voltage and system's operation, design has three part of module unit in described input and level shifting circuit:
1) ac voltage signal detects and level conversion unit
Respectively the ac converter voltage of ac power output Vout output and the ac commercial power voltage of introducing are carried out sample detecting, because the A/D converter in the DSP can only be accepted unipolar signal, and detected sine voltage signal is ambipolar, therefore, before input a/d converter, bipolar signal must be become analog-to-digital conversion input ADCIN0, the ADCIN1 that exports DSP behind the unipolar signal respectively to by level shifting circuit.Described level shifting circuit specifically can adopt adder components commonly used at present to realize.
2) d. c. voltage signal detects and level conversion unit
Be used for the direct voltage state of batteries output is detected.Because the 12V dc low-voltage of the high direct voltage of batteries output and system power supply output is the linear ratio relation substantially, therefore, by the signal of sense switch transformer output 12V winding, can realize batteries output voltage status detection without voltage stabilizing.The direct voltage that collects is done further computing by other one tunnel analog-to-digital conversion input ADCIN2 that level shifting circuit carries out can being input to behind the decompression transformation DSP.
3) current signal detects and level conversion unit
Respectively the inverter output current of ac power output Vout output, the mains current of ac power input end Vin input and the charge/discharge current of batteries are gathered by current sensor, after carrying out the current-voltage conversion, carry out exporting to respectively after step-down is handled other three tunnel analog-to-digital conversion input ADCIN8, ADCIN9, the ADCIN10 of DSP through level shifting circuit.In the present embodiment, can specifically to adopt the instantaneous signal ratio be that 1000: 1 Hall current sensor LA58-P realizes that the utility model is not limited thereto to described current sensor.
DSP (is specially 6 the tunnel according to each the road detection signal that receives and in conjunction with its internal logic program with definite its PWMn output, be n=1,2......6) duty ratio of pwm pulse signal of output, thereby the break-make sequential of control IGBT pipe IGBT1～IGBT6 is to guarantee the stable of inverter unit output voltage.
Because the voltage amplitude of the pwm signal of DSP output is lower, can not realize drive controlling to it therefore, in the emergency power system of present embodiment, having designed an optical couple isolation drive circuit, to improve the driving force of pwm signal if directly act on the IGBT pipe.Fig. 5 is wherein a kind of specific implementation form of described optical couple isolation drive circuit, comprises comparator U1, as the NPN type triode V1 and the optocoupler U4 of switching circuit.Wherein, the potential-divider network that the in-phase input end of comparator U1 is formed via resistance R 7, R8 connects the PWM output of DSP, inverting input connects reference voltage Vref, specifically can select the 1.5V level to realize, when the PWM waveform of DSP output was in high level, comparator U1 exported high level, through diode ZD1 voltage stabilizing rear drive triode V1 conducting, thereby make its collector electrode be in electronegative potential, promptly the SINEDRV1 end is in electronegative potential; The light-emitting diode path conducting of optocoupler U4 is luminous like this, and then drives its illuminated triode conducting, makes the PWM output output low level signal that is connected its collector electrode, controls connected one road IGBT pipe and ends; On the contrary, when the PWM waveform of DSP output is in low level, comparator U1 output low level, triode V1 ends, thereby by SINEDRV1 end output high level, the light-emitting diode path of optocoupler U4 is ended, at this moment, DC power supply VCC2 acts on the PWM output through resistance R 12, makes PWM output output high level signal, to drive the conducting of connected one road IGBT pipe.
Certainly, the NPN type triode V1 that in present embodiment, is mentioned, also the components and parts that can adopt metal-oxide-semiconductor, relay etc. to have on-off action form described switching circuit, be connected between comparator U1 and the optocoupler U4, form optical couple isolation drive circuit, the utility model does not specifically limit this.
Developed the fault self-diagnosis technology in the emergency power system of present embodiment, when breaking down, inverter unit can carry out fault location according to detected result, and provides real-time processing scheme, thereby has improved the fail safe of system.In the present embodiment, described failure diagnosis self diagnosis adopts DSP and programmable logic device (CPLD) to realize, specifically finishes functions such as fault alarm, failed storage, troubleshooting.
Fig. 6 is the theory diagram of programmable logic device (CPLD) and peripheral circuit thereof, specifically connects peripheral components such as keyboard, LCD MODULE, buzzer buzzer, realizes functions such as keyboard scan, address decoding, protection and controlling alarm.Wherein, the address decoding logic of CPLD is by reading (RD), write (WR) and input/output space and select signal (IS) to reconfigure to obtain new read/write signal (RD0 DSP, WR0), with the address bus of DSP the read-write of LCD LCD MODULE is controlled again.The protection control logic of CPLD is to obtaining a low level signal after dc bus over-current signal BUS, output short-circuit signal SHORT and the too high signal TEMP process computings such as (it are effective to be high level) of inverter temperature; this signal is sent to the PDPINTA pin of DSP; to block the output signal of the corresponding PWM output of DSP; and then control inverter quits work when emergency power supply overcurrent, short circuit or temperature occur and crosses high fault, to avoid corresponding urgent telegram to be derived from body and external loading causes damage.
Described dc bus over-current signal BUS, output short-circuit signal SHORT and the too high signal TEMP of inverter temperature are relatively exported by the too high detecting unit sampling of the dc bus over-current detection unit that is provided with in the emergency power system, output short-circuit detecting unit and inverter temperature respectively and obtain.Because this three parts detecting unit often adopts in the existing fault testing circuit, therefore, the utility model is not elaborated at this.
For the emergency power system that makes present embodiment has remote monitoring function, can utilize the serial line interface (such as RS232, RS485 interface etc.) of dsp processor to connect embedded gateway, to realize the remote monitoring of main frame to described emergency power supply.Its operation principle is: during EPS work, job information of himself such as output voltage, electric current, frequency, operating state etc. send to embedded gateway by serial ports, gateway encapsulates these information according to the ICP/IP protocol form, mail to the remote monitoring main frame by Internet then; Control information that the remote monitoring main frame sends and detection signal then are after receiving by embedded gateway, unpack through data, the application layer protocol of formulating according to communicating pair is handled then, issues EPS by serial ports more at last, reaches the purpose of Long-distance Control EPS.
Certainly, described processor also can adopt other integrated chips with signal handling capacity except that dsp chip to realize, the pulse signal of its output also can adopt the pin of other exportable high-low level signals to export as pulse signal output end and provide, and the utility model does not specifically limit this.
The emergency power system of present embodiment is set up inverter by adopting the foregoing circuit structure, makes it possess following advantage:
(1) simplifies hardware circuit, reduced hardware cost; The reliability of control system improves, and is easy to standardization, can adopt unified control circuit board at different systems, gets final product and just Control Software is done some adjustment;
(2) high conformity of system, cost is low, and it is convenient to manufacture;
(3) control flexibly, system upgrade is convenient, even can the online modification control algolithm and needn't change circuit.
Certainly; the above only is a kind of preferred implementation of the present utility model; should be understood that; for those skilled in the art; under the prerequisite that does not break away from the utility model principle; can also make some improvements and modifications, these improvements and modifications also should be considered as protection range of the present utility model.
Claims (10)
1, a kind of digitlization inverter, it is characterized in that: comprise the inverter bridge of forming by the IGBT pipe, its input connects dc bus, the break-make control end connects the pulse signal output end of a processor, under the control action of described processor the direct voltage inversion on the dc bus being generated alternating voltage exports, and then connect ac power output through the filter circuit that boosts, and by input and level shifting circuit feedback loop output signal to described processor.
2, digitlization inverter according to claim 1, it is characterized in that: in described inverter, include a system power supply module, its input connects described dc bus, the dc low-voltage that the high direct voltage that receives is converted to multiple current potential is exported, for the functional circuit in the inverter provides work required DC power supply.
3, digitlization inverter according to claim 2 is characterized in that: the pulse signal output end of described processor connects the break-make control end of described inverter bridge by optical couple isolation drive circuit.
4, digitlization inverter according to claim 3 is characterized in that: include comparator, switching circuit and the optocoupler that is connected with described switching circuit in described optical couple isolation drive circuit; The wherein pulse signal output end of one road input connection processing device of described comparator, another road input connects reference voltage, and output connects the control end of described switching circuit; On off operating mode by changing described switching circuit to be controlling the break-make of described optocoupler, and then the output by described optocoupler is to the break-make control end output pulse signal of inverter bridge.
5, digitlization inverter according to claim 1; it is characterized in that: in described inverter, also include dc bus over-current detection unit, output short-circuit detecting unit and/or the too high detecting unit of inverter temperature; its detection signal output connects the input of a programmable logic device; generate guard signal by described programmable logic device and export described processor to, with the output of the pulse signal output end that blocks processor.
6, digitlization inverter according to claim 1, it is characterized in that: the voltage on the described dc bus is provided by batteries, the input of described batteries connects ac power input end by current rectifying and wave filtering circuit, and the dc voltage output end of batteries connects described dc bus.
7, according to each described digitlization inverter in the claim 2 to 6, it is characterized in that: in described input and level shifting circuit, include ac voltage signal and detect and level conversion unit, its input connects described ac power output, alternating voltage to its output is sampled, and by level shifting circuit bipolar signal is converted to wherein one tunnel analog-to-digital conversion input that unipolar signal exports described processor to.
8, digitlization inverter according to claim 7, it is characterized in that: in described input and level shifting circuit, also include d. c. voltage signal and detect and level conversion unit, its input connects wherein one road dc power output end of described system power supply module, exports another road analog-to-digital conversion input of described processor behind decompression transformation to.
9, digitlization inverter according to claim 8, it is characterized in that: in described input and level shifting circuit, also include current signal and detect and level conversion unit, wherein, in the current signal detecting unit, include current sensor, the electric current of described ac power input end input, the electric current of ac power output output or the charge/discharge current of batteries are gathered, after carrying out the current-voltage conversion, export the analog-to-digital conversion input of described processor to through level shifting circuit.
10, digitlization inverter according to claim 9 is characterized in that: described processor is the DSP digital signal processor.
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| Application Number | Priority Date | Filing Date | Title |
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| CNU2008200164942U CN201160259Y (en) | 2008-01-15 | 2008-01-15 | Digitized inverter |
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| CNU2008200164942U CN201160259Y (en) | 2008-01-15 | 2008-01-15 | Digitized inverter |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102593895A (en) * | 2012-02-15 | 2012-07-18 | 武汉华海通用电气有限公司 | Storage battery discharging device capable of working in two modes |
| CN103618374A (en) * | 2013-12-10 | 2014-03-05 | 南京工业职业技术学院 | Intelligent square wave output uninterruptible power supply |
| CN104135174A (en) * | 2014-08-08 | 2014-11-05 | 乐清市博优新能源科技有限公司 | High-frequency split phase inverter |
| CN108843097A (en) * | 2018-06-27 | 2018-11-20 | 佛山市诺行科技有限公司 | A kind of battery direct-furnish driving device of transverse shifting ascending and descending parking device |
| CN109599843A (en) * | 2019-01-09 | 2019-04-09 | 深圳市德兰明海科技有限公司 | A kind of current foldback circuit and inverter of light-coupled isolation |
| WO2020186731A1 (en) * | 2019-03-15 | 2020-09-24 | 谢志和 | Ac/dc conversion power supply system |
| CN114460866A (en) * | 2021-12-27 | 2022-05-10 | 西门子工厂自动化工程有限公司 | Signal control method and device for main loop and computer readable medium |
-
2008
- 2008-01-15 CN CNU2008200164942U patent/CN201160259Y/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102593895A (en) * | 2012-02-15 | 2012-07-18 | 武汉华海通用电气有限公司 | Storage battery discharging device capable of working in two modes |
| CN103618374A (en) * | 2013-12-10 | 2014-03-05 | 南京工业职业技术学院 | Intelligent square wave output uninterruptible power supply |
| CN104135174A (en) * | 2014-08-08 | 2014-11-05 | 乐清市博优新能源科技有限公司 | High-frequency split phase inverter |
| CN108843097A (en) * | 2018-06-27 | 2018-11-20 | 佛山市诺行科技有限公司 | A kind of battery direct-furnish driving device of transverse shifting ascending and descending parking device |
| CN109599843A (en) * | 2019-01-09 | 2019-04-09 | 深圳市德兰明海科技有限公司 | A kind of current foldback circuit and inverter of light-coupled isolation |
| WO2020186731A1 (en) * | 2019-03-15 | 2020-09-24 | 谢志和 | Ac/dc conversion power supply system |
| CN114460866A (en) * | 2021-12-27 | 2022-05-10 | 西门子工厂自动化工程有限公司 | Signal control method and device for main loop and computer readable medium |
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Granted publication date: 20081203 |