CN102769336B - Single-phase inverter for emergency power supply - Google Patents
Single-phase inverter for emergency power supply Download PDFInfo
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Abstract
The invention discloses a single-phase inverter for an emergency power supply, belonging to the technical field of power electronic equipment. The single-phase inverter for the emergency power supply comprises a DSP (Digital Signal Processor) chip, an analog signal detecting module, a digital signal controlling module, a remote monitoring module, an inverter driving module, a single-phase full-bridge inverting module and a power module. The invention integrates all independently worked functional modules into a cabinet, simplifies the schematic diagram of the cabinet and avoids the shortcoming of the traditional single-phase inverter for the emergency power supply that the single-phase inverter cannot be detached when being integrated to a cabinet. As the inverter driving module has the function of saturation voltage drop detection output, the inverter voltage, the voltage of the storage battery, the fire-fighting linkage signal, the forced signal and the bypass signal can be sampled without using any auxiliary switch power shell, and the circuit design is simplified, and the production cost is reduced. The design of the surge absorber branch in the single-phase inverter bridge reduces the influence on the output voltage of the inverter when the abrupt current is turned off by the power switch.
Description
Technical field
The invention discloses a kind of single-phase inverter for emergency power supply power, belong to the technical field of power electronic equipment.
Background technology
EPS (Emergency Power Supply, emergency power supplies) power supply, be a kind of emergency power supply adopted in order to electric power safeguard and security against fire in current important building, it is primarily of input-output unit, charging module, battery pack, inverter, watch-dog, output switching device composition.Inverter is the core devices of EPS power supply, and the frequency converter of outsourcing from the market uses as inverter by most of EPS manufacturer, and frequency converter is existed following defect when inverter uses:
(1) frequency converter no-reverse change Voltage Feedback function, causes the output voltage of EPS power supply to fluctuate along with battery voltage, there is the risk damaging load;
(2) most of frequency converter adopts SPWM control algolithm, there is the problem that amount of calculation is large, bus utilance is low; Separately need add digital signal control circuit, analog signal sample circuit, control complicated, cost is high;
(3) frequency converter of market purchasing, do not sample inverter voltage, battery tension and fire-fighting link, pressure, by-passing signal, need additional module and auxiliary switching power supply housing, and cost increases.
Summary of the invention
Technical problem to be solved by this invention is the deficiency for above-mentioned background technology, provides a kind of single-phase inverter for emergency power supply power.
The present invention adopts following technical scheme for achieving the above object:
A kind of single-phase inverter for emergency power supply power: comprise dsp chip, analog signal detection module, Digital Signals module, remote monitoring module, inversion driver module, single-phase full bridge inversion module, power module; Wherein: described analog signal detection module, Digital Signals module, remote monitoring module are connected with dsp chip respectively; The input of described inversion driver module is connected with dsp chip, and output is connected with the input of single-phase full bridge inversion module; The output of described single-phase full bridge inversion module is connected with Industrial Frequency Transformer; The power supply port of described dsp chip, the power supply port of inversion driver module are connected with the output of power module respectively;
Described inversion driver module comprises: first to fourth resistance, detects diode, clamp diode, the first electric capacity, first, second power switch pipe, the first diode;
Wherein, described first, one end of second resistance is connected with direct voltage source respectively, detect diode, the negative electrode of clamp diode, one end of 3rd resistance is connected with the other end of the second resistance respectively, the other end of the 3rd resistance is connected with the gate pole of the first power switch pipe, another termination first diode anode of first resistance, first power switch pipe collector is connected with the first diode cathode, the grounded emitter of the first power switch pipe, the anode detecting diode is connected with the 4th resistance one end, 4th resistance other end ground connection, the anode of clamp diode is connected with the collector electrode of the second power switch pipe, the base stage of the second power switch pipe is connected with a pole of the first electric capacity, another pole ground connection of first electric capacity, the grounded emitter of the second power switch pipe.
As the further prioritization scheme of the described single-phase inverter for emergency power supply power, single-phase full bridge inversion module comprises: accumulator cell charging and discharging module, half-bridge converter, the input of described half-bridge converter and accumulator cell charging and discharging model calling, output is connected with the first siding ring of Industrial Frequency Transformer; Wherein:
Described accumulator cell charging and discharging module comprises batteries, two relays, the 5th resistance, filter capacitors, the normally closed port of two relays is connected with the positive pole of batteries respectively, the often ported of first relay is connected with one end of the 5th resistance, the positive pole that is often ported, filter capacitor of the second relay is connected with the other end of the 5th resistance respectively, and the negative pole of filter capacitor is connected with the negative pole of batteries.
As the further prioritization scheme of the described single-phase inverter for emergency power supply power, half-bridge converter comprises two brachium pontis in parallel, wherein: each brachium pontis comprises a series arm be made up of two insulated gate bipolar transistors, and be connected in parallel on the sudden-wave absorbing branch road at described series arm two ends; Described sudden-wave absorbing branch road comprises the sudden-wave absorbing diode, the sudden-wave absorbing electric capacity that are connected in series, and is connected in parallel on the sudden-wave absorbing resistance at sudden-wave absorbing diode the two poles of the earth.
The present invention adopts technique scheme, there is following beneficial effect: the functional module each worked independently is integrated in a cabinet, simplify cabinet schematic diagram, facilitate wiring, functional module can be changed according to the actual requirements, avoid be conventionally used to emergency power supply single-phase inverter once the shortcoming of parts cannot be changed after integrated dress cabinet; Because inversion modular belt saturation voltage drop detects output function, so can to sample inverter voltage, battery tension and fire-fighting link, pressure, by-passing signal without the need to auxiliary switching power supply housing, simplify circuit design, reduce production cost; In half-bridge converter, the design of sudden-wave absorbing branch road reduces power switch pipe and turns off mutation current to the impact of inverter output voltage.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of the single-phase inverter for emergency power supply.
Fig. 2 is the schematic diagram of power module.
Fig. 3 is the schematic diagram of inversion driver module.
Fig. 4 is the schematic diagram of single-phase full bridge inversion module.
Fig. 5 is the schematic diagram of Digital Signals module.
Number in the figure illustrates: R1-R12 is the first to the 12 resistance, D1-D4 is first to fourth diode, ZD1 is detection diode, ZD2 is clamp diode, Q1-Q4 is first to fourth power switch pipe pipe, J1, J2 are first, second relay, IBGT1-IBGT4 is first to fourth insulated gate bipolar transistor, and JDQ1 is relay coil, and OP1 is optocoupler.
Embodiment
Be described in detail below in conjunction with the technical scheme of accompanying drawing to invention:
As shown in Figure 1, the single-phase inverter for emergency power supply power comprises: dsp chip, analog signal detection module, Digital Signals module, remote monitoring module, inversion driver module, single-phase full bridge inversion module, power module.Analog signal detection module, Digital Signals module, remote monitoring module, to be connected with dsp chip respectively.The input of inversion driver module is connected with dsp chip, and output is connected with the input of single-phase full bridge inversion module, and the output of single-phase full bridge inversion module is connected with Industrial Frequency Transformer.The power supply port of dsp chip, the power supply port of inversion driver module are connected with the output of power module respectively.
Power module is as shown in Figure 2: when there being civil power, rectifier bridge output voltage is higher than batteries busbar voltage, so rectifier bridge output voltage is powered to Switching Power Supply; When without civil power, batteries is powered to Switching Power Supply.Wherein two diodes play anti-reaction, prevent positive rectification from exporting bus and charge a battery and positive direct-current bus recoil rectifier bridge, damage rectification circuit.
Inversion driver module is illustrated in figure 3 the grid clamping current foldback circuit detected based on saturation voltage drop, comprising: first to fourth resistance R1-R4, and first detects diode ZD1, clamp diode ZD2, the first electric capacity C1, first, second power switch pipe Q1, Q2.First, second resistance R1, one end of R2 is connected with direct voltage source VCC respectively, first, clamp diode ZD1, the negative electrode of ZD2, one end of 3rd resistance R3 is connected with the other end of the second resistance R2 respectively, the other end of the 3rd resistance R3 is connected with the gate pole of the first power switch pipe Q1, the collector electrode meeting the first power switch pipe Q1 after the other end of the first resistance R1 is connected with the first diode D1 connects, the grounded emitter of the first power switch pipe Q1, the anode detecting diode ZD1 is connected with the 4th resistance R4 ground connection afterwards, the anode of clamp diode ZD2 is connected with the collector electrode of the second power switch pipe Q2, the base stage of the second power switch pipe Q2 is connected with a pole of the first electric capacity C1, another pole ground connection of first electric capacity C1, the grounded emitter of the second power switch pipe Q2.
First diode D1 plays buffer action, and when the first power switch pipe Q1 turns off, main circuit voltage V+ makes the first diode D1 reverse-biased; When first power switch pipe Q1 opens, the Vce of the first power switch pipe Q1 only has about 3V, and the power Vcc of protective circuit and gate driver circuit is usually at more than 15V, and the first diode D1 becomes positively biased and conducting.When first power switch pipe Q1 opens, the saturation voltage drop Vce of the first power switch pipe Q1 under normal operating conditions is 3V, the voltage detected on diode ZD1 be the first diode D1 open pressure drop+Vce, detect diode ZD1 and do not puncture.When the first power switch pipe Q1 is in over-current state; the Vce of the first power switch pipe Q1 rises to more than 5V; first diode D1 becomes cut-off from opening, and detect diode ZD1 and puncture conducting, protective circuit obtains over-current signal and control gate drive circuit quits work.Clamp diode ZD2, when the first power switch pipe Q1 overcurrent, by grid potential clamper at about 6V, makes the first power switch pipe Q1 exit saturation conduction and forward magnifying state to, the electric current of main circuit is lowered.First electric capacity C1 plays cushioning effect, when detection diode ZD1 is breakdown, first charges to the first electric capacity C1, makes the first power switch pipe Q1 be unlikely to turn off rapidly and cause inductive load to produce too high induced voltage.
Single-phase full bridge inversion module is as shown in Figure 4: single-phase full bridge inversion module comprises the accumulator cell charging and discharging module, the half-bridge converter that connect successively, the output of half-bridge converter is connected with the first siding ring of Industrial Frequency Transformer T1, and the second siding ring of Industrial Frequency Transformer T1 is parallel with the 4th electric capacity C4.Accumulator cell charging and discharging module comprises batteries, two relay J 1, J2,5th resistance R5, filter capacitor EC1, the normally closed port of two relay J 1, J2 connects respectively at the positive pole of batteries, the often ported of first relay J 1 is connected with one end of the 5th resistance R5, the positive pole that is often ported, filter capacitor EC1 of the second relay J 2 is connected with the other end of the 5th resistance R5 respectively, and the negative pole of filter capacitor EC1 is connected with the negative pole of batteries.Half-bridge converter comprises two brachium pontis in parallel, a brachium pontis comprises: the series arm be made up of first and second insulated gate bipolar transistor IGBT1, IGBT2, and be connected in parallel on the sudden-wave absorbing branch road at described series arm two ends, sudden-wave absorbing branch road comprises the sudden-wave absorbing diode D2, the sudden-wave absorbing electric capacity C2 that are connected in series, and is connected in parallel on the sudden-wave absorbing resistance R6 of sudden-wave absorbing diode D2 two-stage.Another brachium pontis comprises: the series arm be made up of third and fourth insulated gate bipolar transistor IGBT3, IGBT4, and be connected in parallel on the sudden-wave absorbing branch road at described series arm two ends, sudden-wave absorbing branch road comprises the sudden-wave absorbing diode D3, the sudden-wave absorbing electric capacity C3 that are connected in series, and is connected in parallel on the sudden-wave absorbing resistance R7 of sudden-wave absorbing diode D3 two-stage.By switch I GBT, DC energy converts AC energy to, and sudden-wave absorbing branch road absorbs the energy conversion amount that IGBT causes at shutdown moment mutation current.This topology and Buck type DC-DC conversion circuit have common part, and the input direct-current busbar voltage of Buck type inverter strictly limits the sinusoidal wave peak value of inverter voltage, therefore can export external Industrial Frequency Transformer T1 in inversion, this transformer raising voltage and filter action.
All analog signals of being connected with dsp chip and original signal all electrical isolation.Line voltage, inverter voltage mainly adopt Voltage Type Current Transformer to sample with road of far discharging, and wherein inverter voltage refers to the voltage of the output voltage of single-phase full bridge inversion module after Industrial Frequency Transformer boosting.Output current refers to that emergency power supply outputs to the electric current of load, is civil power output current during mains-supplied, is then the electric current that common frequency power transformer secondary outputs to load when inversion is powered, and adopts 2 grades of current transformers and discharge circuit to sample; Accumulator DC pressure adopts linear optical coupling and discharge circuit to sample.Because line voltage, inverter voltage, output current, busbar voltage need monitoring in real time, these signals all need sampling always.Each carrier cycle sampling line voltage, inverter voltage, output current, charging current, accumulator battery voltage in reversals, current sampling point is adopted inverter voltage substitutes into corresponding sampled point computational prediction inverter output voltage in the last robust modulation cycle, PID adjusting pulsewidth modulation ratio, fast and stable output wave is smooth sinusoidal wave; Each carrier cycle is to analyzing line voltage, fast detecting city power recovery; Multiple carrier cycle computational load electric current, analyzes whether exceed nominal load, carries degree adjustment inversion output time according to band.
Digital Signals module as shown in Figure 5, realizes switching value digital signal acquiring and contact output function.The one termination CTR1 signal of the 8th resistance R8,9th resistance R9 connects the emitter of the 3rd power switch pipe after connecting with the 8th resistance R8, connect the base stage of the 3rd power switch pipe after tenth resistance R10 and the 8th resistance R8 is connected in series, the collector electrode of the 3rd power switch pipe connects the anode of optocoupler OP1; The minus earth of optocoupler, emitter connects COM signal, collector electrode connects one end of the 11 resistance R11, and one end of the 12 resistance R12, the base stage of the 4th power switch pipe Q4 are connected with the other end of the 11 resistance R11 respectively, another termination direct voltage source of the 12 resistance R12; The emitter of the 4th power switch pipe Q4 connects direct voltage source, and collector electrode connects the negative electrode of the 4th diode D4, and the anode of the 4th diode connects COM signal, and relay coil JDQ1 is connected with the two-stage of the 4th diode D4.In On-off signal figure, IN is peripheral input, and when signal is effective, IN receives the ground of+24V, optocoupler OP1 conducting, and INPUT becomes low level from high level, and INPUT is connected on the universal I/O port of DSP; In output switch parameter figure, CTR is connected on the universal I/O port of DSP, and when CTR is high, optocoupler OP1 not conducting, relay coil must not be electric, so do not work.When CTR is low, optocoupler OP1 conducting, relay coil obtains electric, relay work.
Remote monitoring module to host computer transmission invertor operation data and state, realizes RMON in real time.Remote monitoring module is communication module, is specially serial ports MODBUS protocol communication.Invertor operation data are finger print analog quantity, digital information, running state data specifically.Analog data comprises line voltage, inverter voltage, output current, busbar voltage; Digital data refers to fire-fighting link, pressure, the collection of bypass input amount; Running state data refers to that mains supply over-voltage, inverter overload, battery undervoltage, overcurrent, civil power export, inversion exports data.
DSP master control system module adopts the core processing unit of TMS320F28027 as inverter of TI company.JTAG mouth is supported in sequence of threads debugging; Analog signal line voltage, inverter voltage, output current, charging current, accumulator battery voltage are input to respectively in chip AD sampling channel ADC-A1, ADC-A2, ADC-A3, ADC-A4, ADC-A6 and sample; 3 On-off signal signals are input on GPIO mouth, INPUT1-INPUT3 is followed successively by fire-fighting link signal, forced signal, by-passing signal, CTR1-CTR3 is output switch amount signal, controls civil power/inversion switching, bus precharge, under-voltage control relay action; The SCI communication interface of remote monitoring module access chip; EPWM1, EPWM2 produce the complementary PWM ripple that 2 groups add dead band, produce pulse doubleization SVPWM waveform by algorithm, and DSP is exported low-voltage signal and becomes high-voltage signal driving IGBT by inversion driver module; Short-circuit protection signal is connected to the TZ1 pin of chip, drags down EPWM1, EPWM2 when a short circuit occurs and export.
Single-phase inverter operation principle for emergency power supply is as follows: inverter powers on, initialization system configuration and variable, and adhesive first relay J 1, and batteries is by resistance R to bussed supply, and EC1 is slow to charge, sample battery group voltage.If under-voltage, then not adhesive second relay J 2, time delay disconnects the first relay J 1 in 1 minute, whether after this adhesive per hour 1 the first relay J 1 is recovered to analyze accumulator battery voltage, as 24 interior hour voltages all do not have recovery, then be judged to be battery failures, no longer adhesive first relay J 1, reduce battery discharge to protect storage battery; If battery pack is not under-voltage, adhesive second relay J 2, batteries is directly powered to bus.As J2 adhesive in normal course of operation, as none-disk terminal signal, when having municipal power failure, manual ringing, self-inspection effective, inverter delay startup enters inverter mode, proceeding to emergent output after inverter voltage is stable; When city power recovery, manually invalid, self-inspection time then or batteries is under-voltage time, inverter stops inversion.Wherein self-inspection is divided into a moon self-inspection, year self-inspection, moon self-inspection batteries is discharged 2 minutes, year self-inspection is discharged to and under-voltagely should be not less than 90 minutes, otherwise to host computer report corresponding failure, therefore inverter has and automatically detects EPS power work whether normal function, and discharges to battery pack, charges to keep battery-active.
In sum, the functional module that each worked independently of single-phase inverter for emergency power supply of the present invention is integrated in a cabinet, simplify cabinet schematic diagram, facilitate wiring, functional module can be changed according to the actual requirements, avoid be conventionally used to emergency power supply single-phase inverter once the shortcoming of parts cannot be changed after integrated dress cabinet; Because inversion modular belt saturation voltage drop detects output function, so can to sample inverter voltage, battery tension and fire-fighting link, pressure, by-passing signal without the need to auxiliary switching power supply housing, simplify circuit design, reduce production cost; In half-bridge converter, the design of sudden-wave absorbing branch road reduces power switch pipe and turns off mutation current to the impact of inverter output voltage.Described specific embodiment be only the present invention a kind of execution mode, every the present invention's execution mode in a word that meets is all within protection scope of the present invention.
Claims (3)
1. the single-phase inverter for emergency power supply power: it is characterized in that: comprise dsp chip, analog signal detection module, Digital Signals module, remote monitoring module, inversion driver module, single-phase full bridge inversion module, power module; Wherein: described analog signal detection module, Digital Signals module, remote monitoring module are connected with dsp chip respectively; The input of described inversion driver module is connected with dsp chip, and output is connected with the input of single-phase full bridge inversion module; The output of described single-phase full bridge inversion module is connected with Industrial Frequency Transformer; The power supply port of described dsp chip, the power supply port of inversion driver module are connected with the output of power module respectively;
Described inversion driver module comprises: first to fourth resistance, detects diode, clamp diode, the first electric capacity, first, second power switch pipe, the first diode;
Wherein, described first, one end of second resistance is connected with direct voltage source respectively, detect diode, the negative electrode of clamp diode, one end of 3rd resistance is connected with the other end of the second resistance respectively, the other end of the 3rd resistance is connected with the gate pole of the first power switch pipe, another termination first diode anode of first resistance, first power switch pipe collector is connected with the first diode cathode, the grounded emitter of the first power switch pipe, detect the anode of diode, 4th resistance one end, first electric capacity one is extremely all connected with the base stage of the second power switch pipe, 4th resistance other end ground connection, the anode of clamp diode is connected with the collector electrode of the second power switch pipe, another pole ground connection of first electric capacity, the grounded emitter of the second power switch pipe.
2. a kind of single-phase inverter for emergency power supply power according to claim 1, it is characterized in that described single-phase full bridge inversion module comprises: accumulator cell charging and discharging module, half-bridge converter, the input of described half-bridge converter and accumulator cell charging and discharging model calling, output is connected with the first siding ring of Industrial Frequency Transformer; Wherein:
Described accumulator cell charging and discharging module comprises batteries, two relays, the 5th resistance, filter capacitors, the normally closed port of two relays is connected with the positive pole of batteries respectively, the often ported of first relay is connected with one end of the 5th resistance, the positive pole that is often ported, filter capacitor of the second relay is connected with the other end of the 5th resistance respectively, and the negative pole of filter capacitor is connected with the negative pole of batteries.
3. a kind of single-phase inverter for emergency power supply power according to claim 2, it is characterized in that described half-bridge converter comprises two brachium pontis in parallel, wherein: each brachium pontis comprises a series arm be made up of two insulated gate bipolar transistors, and be connected in parallel on the sudden-wave absorbing branch road at described series arm two ends; Described sudden-wave absorbing branch road comprises the sudden-wave absorbing diode, the sudden-wave absorbing electric capacity that are connected in series, and is connected in parallel on the sudden-wave absorbing resistance at sudden-wave absorbing diode the two poles of the earth.
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| CN104821751A (en) * | 2015-03-31 | 2015-08-05 | 浙江新富凌电气股份有限公司 | Frequency converter rapid start-stop machine control system |
| CN108063540B (en) * | 2018-01-02 | 2024-02-02 | 清华大学 | Separately excited starting self-excited power supply cascading submodule power supply system |
| JP7370223B2 (en) * | 2019-01-24 | 2023-10-27 | 株式会社Soken | power converter |
| CN112630497B (en) * | 2020-12-03 | 2024-03-26 | 苏州英威腾电力电子有限公司 | Self-checking method, device and system of PWM rectifier |
| CN115600061B (en) * | 2022-12-14 | 2023-03-28 | 嘉兴索罗威新能源有限公司 | Inverter zero voltage drop data processing method based on machine learning |
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Effective date of registration: 20220812 Address after: No. 1, Huaxing Road, Sanmao Street, Yangzhong City, Zhenjiang City, Jiangsu Province, 212200 Patentee after: JIANGSU YINJIA ELECTRONIC EQUIPMENT CO.,LTD. Address before: 212215 868 Gangxing Road, Yangzhong Economic Development Zone, Zhenjiang City, Jiangsu Province Patentee before: JIANGSU YINJIA GROUP Co.,Ltd. |