CN204597803U - There is the inverter of novel protected circuit - Google Patents
There is the inverter of novel protected circuit Download PDFInfo
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- CN204597803U CN204597803U CN201520189528.8U CN201520189528U CN204597803U CN 204597803 U CN204597803 U CN 204597803U CN 201520189528 U CN201520189528 U CN 201520189528U CN 204597803 U CN204597803 U CN 204597803U
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- 230000000087 stabilizing effect Effects 0.000 claims abstract description 29
- 230000001681 protective effect Effects 0.000 claims abstract description 24
- 238000003079 width control Methods 0.000 claims abstract description 17
- 238000001914 filtration Methods 0.000 claims description 21
- 239000003381 stabilizer Substances 0.000 claims description 17
- 239000003990 capacitor Substances 0.000 claims description 3
- 230000009471 action Effects 0.000 description 17
- 101100489717 Saccharomyces cerevisiae (strain ATCC 204508 / S288c) GND2 gene Proteins 0.000 description 10
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- 239000000306 component Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000036961 partial effect Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000004044 response Effects 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000036772 blood pressure Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 230000005669 field effect Effects 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000002829 reductive effect Effects 0.000 description 1
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- 238000013083 solar photovoltaic technology Methods 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
Abstract
The utility model relates to a kind of inverter with novel protected circuit.Mainly solve existing photovoltaic DC-to-AC converter circuit structure complexity, software programming is loaded down with trivial details, cost is high, reliably low problem.It is characterized in that: described in there is the inverter of novel protected circuit, it comprises PWM voltage stabilizing and feedback pulse width control circuit, under-voltage protecting circuit, civil power switches and charging circuit, high pressure switches and protective circuit, described PWM voltage stabilizing is connected with under-voltage protecting circuit with the first resistance by DC source with feedback pulse width control circuit, by the first pressurizer, second resistance switches with civil power and is connected with charging circuit, to be switched with high pressure by first processor and be connected with protective circuit, described civil power switches with charging circuit by the first diode, 3rd resistance switches with high pressure and is connected with protective circuit.This inverter discrimination precision with novel protected circuit is high, and control fast, functional reliability is high, with low cost, is easy to promote.
Description
Technical field
The utility model relates to solar photovoltaic technology field, is specifically related to a kind of inverter with novel protected circuit.
Background technology
Energy crisis and problem of environmental pollution are more and more serious, and solar energy, as a kind of clean green energy resource, becomes the focus of all kinds of research.Square-wave inverter realizes simple as one, the Solar use mode that conversion efficiency is high, plays a significant role wherein.
Square-wave inverter is a kind of device low-voltage DC being converted to high-voltage alternating square wave by transformer, is the core component of photovoltaic generation.Its chief component comprises PWM integrating control chip, peripheral control circuits, drive circuit and protective circuit.Inverter is by 12V storage battery power supply, and the direct current after control circuit and transformer primary side all adopt 12V or lowering and stabilizing blood pressure, produces the ac square wave of 220V after transformer boost at secondary side.
Existing photovoltaic DC-to-AC converter many employings single-chip microcomputer controls; software programming is complicated; construction cycle is long; add the cost of photovoltaic DC-to-AC converter; and existing square-wave inverter input voltage de-stabilising effect Circuit Fault on Secondary Transformer change in voltage; high tension protection circuit implementation is complicated, and reliability is low.
Utility model content
In order to overcome the deficiency of background technology, the utility model provides a kind of inverter with novel protected circuit, mainly solve existing photovoltaic DC-to-AC converter circuit structure complexity, software programming is loaded down with trivial details, cost is high, reliably low problem, this inverter with novel protected circuit adopts control voltage many employings direct current to carry out circuit judges and protection, effectively reduce circuit design cost, and discrimination precision is high; Have employed special PWM integrating control chip, eliminate complicated soft program process, simplify circuit structure, make control procedure simple and clear with control result, control fast, cost is low; Protective circuit has been come by hardware completely, can decision circuitry state fast, and comparatively conventional protection devices response speed is faster; Control and scheduling co-design circuit element is conventional components and parts, and functional reliability is high, and versatility and good economy performance are with low cost, is easy to promote.
The technical scheme that the utility model adopts is: a kind of inverter with novel protected circuit, it comprises PWM voltage stabilizing and feedback pulse width control circuit, under-voltage protecting circuit, civil power switches and charging circuit, high pressure switches and protective circuit, described PWM voltage stabilizing is connected with under-voltage protecting circuit with the first resistance by DC source with feedback pulse width control circuit, by the first pressurizer, second resistance switches with civil power and is connected with charging circuit, described civil power switches with charging circuit by the first diode, 3rd resistance switches with high pressure and is connected with protective circuit, described PWM voltage stabilizing and feedback pulse width control circuit to be switched with high pressure by first processor and are connected with protective circuit, feedback signal in described PWM voltage stabilizing and feedback pulse width control circuit after inversion by connecing first processor after full-bridge rectification and filtering, in order to control the pulse duty cycle of alternating square wave, in described under-voltage protecting circuit, DC source connects the first operational amplifier through the first resistance and is used as power supply source, and on the other hand, the first resistance connects the first operational amplifier after connecing the 4th resistance, the 5th resistance, first accurate adjustable resistance is as divider resistance, and the first electric capacity is used as filtering, through the resistance-capacitance network of over under-voltage protection circuit after another road first resistance connection the 6th resistance, finally connect the first operational amplifier, when DC source voltage declines, the zero setting of first processor output signal, inversion work stops, and namely enters under-voltage protection, described civil power switches with charging circuit, after the first pressurizer voltage stabilizing, switching controls first relay is linked into by the voltage signal of DC source, when mains voltage is linked into the first trigger after resistance, electric capacity, described first trigger controls first processor output signal, on the other hand, alternating voltage accesses the second trigger after the 7th resistance, the second diode rectification, the second accurate adjustable resistance dividing potential drop, and described second trigger controls to switch mains circuit and charging circuit by the first transformer, described high pressure switches with protective circuit, the ac square-wave voltage obtained by feedback dividing potential drop is through the 3rd diode, the second capacitance rectifier filtering, again after the 8th resistance, the 9th resistance, the tenth resistance, the 3rd capacitor filtering, the first voltage-stabiliser tube voltage stabilizing, access the second operational amplifier, the feedback direct current signal of the 3rd diode cathode is after the second relay, after the first diode, the 3rd resistance, the 3rd accurate adjustable resistance dividing potential drop, access the second operational amplifier through the 8th resistance, described second operational amplifier controls high-tension circuit and low-voltage circuit switches, between DC source and first processor, access the 4th diode and the first triode form high tension protection circuit.
The beneficial effects of the utility model are: owing to taking technique scheme, and this inverter with novel protected circuit adopts control voltage many employings direct current to carry out circuit judges and protection, effectively reduce circuit design cost, and discrimination precision is high; Have employed special PWM integrating control chip, eliminate complicated soft program process, simplify circuit structure, make control procedure simple and clear with control result, control fast, cost is low; Protective circuit has been come by hardware completely, can decision circuitry state fast, and comparatively conventional protection devices response speed is faster; Control and scheduling co-design circuit element is conventional components and parts, and functional reliability is high, and versatility and good economy performance are with low cost, is easy to promote.
Accompanying drawing explanation
Fig. 1 is operation principle schematic diagram of the present utility model.
Fig. 2 is PWM voltage stabilizing of the present utility model and feedback pulse width control circuit schematic diagram.
Fig. 3 is under-voltage protecting circuit schematic diagram of the present utility model.
Fig. 4 is that civil power of the present utility model switches and charging circuit, high pressure switch and protective circuit schematic diagram.
Embodiment
Below in conjunction with accompanying drawing, the utility model embodiment is described further:
As shown in Fig. 1 to Fig. 4, a kind of inverter with novel protected circuit, it comprises PWM voltage stabilizing and feedback pulse width control circuit, under-voltage protecting circuit, civil power switch and charging circuit, high pressure switch and protective circuit;
Described PWM voltage stabilizing is connected with under-voltage protecting circuit with resistance R50 by DC source DC12V with feedback pulse width control circuit, by pressurizer L7812CV, resistance R49 switches with civil power and is connected with charging circuit, described civil power is switched to be switched with high pressure by diode D20, resistance R44 with charging circuit and is connected with protective circuit, described PWM voltage stabilizing with feed back the lock-in control pin 10 of pulse width control circuit by first processor SG3524N and to switch with high pressure and be connected with protective circuit; Feedback signal in described PWM voltage stabilizing and feedback pulse width control circuit after inversion by connecing the inverting input pin 1 of first processor SG3524N internal error amplifier after full-bridge rectification and filtering, in order to control the pulse duty cycle of alternating square wave;
Described PWM voltage stabilizing is with feedback pulse width control circuit, because the high-voltage alternating square wave finally exported is directly proportional to battery tension, the pin 10 of first processor SG3524N is lock-in control pin, DC source DC12V accesses triode Q1 base stage after the voltage-stabiliser tube D5 of 16V, resistance R10 is parallel to voltage-stabiliser tube D5 and connects DC source DC12V and triode Q1 collector electrode, simultaneously triode Q1 base stage pull down resistor ground connection; When DC source DC12V power supply source voltage is greater than 16.7V, triode Q1 conducting, the 10 pin high level of first processor SG3524N, first processor SG3524N works stopping.The connected mode of four parts is: DC source DC12V port connects the voltage-stabiliser tube D5 negative pole in high voltage protective part, power to the operational amplifier U2B in low-voltage protection circuit through resistance R50, on the other hand through same, the rp input signal of resistance-capacitance network respectively as operational amplifier U2B simultaneously; Civil power is switched and is connected with DC source DC12V by resistance R49, pressurizer L7812CV, resistance R14 with charging circuit part, and the resistance R49 other end is connected to two and opens two and close on 4 pin of latching relay K12.
Described PWM voltage stabilizing fetches the ac converter square wave from Circuit Fault on Secondary Transformer with 1,2 pins of alternating current source AC24V port in feedback pulse width control circuit, diode D7, diode D8, diode D9 and diode D10 form full bridge rectifier, resistance R85 is connected on the negative pole of D7 and D8, and resistance R8 connects with accurate adjustable resistance W2, resistance R7 is parallel to resistance R85 and GND two ends respectively after connecting with resistance R99; Obtain dividing potential drop before resistance R85 and resistance R8 and access 1 pin of first processor SG3524N as feedback voltage by diode D6.
In described under-voltage protecting circuit; DC source DC12V is used as power supply source through 4 pin of resistance R50 concatenation operation amplifier U2B; on the other hand; the inverting input pin 6 of operational amplifier U2B is connect after resistance R50 connecting resistance R9, resistance R56; accurate adjustable resistance W5 is connected on 6 pin as divider resistance, and electric capacity C18 is used as filtering.Resistance-capacitance network through over under-voltage protection circuit after connecting resistance R51 after the resistance R50 of another road, the in-phase input end pin 5 of last concatenation operation amplifier U2B.When DC source DC12V voltage drop, the voltage at pin 5 place due to the pressure stabilization function voltage of voltage-stabiliser tube D50 almost constant, and the voltage at pin 6 place reduces with DC source voltage in point pressure that accurate adjustable resistance W5 has set and reduces.When voltage lower than pin 5 of the voltage of pin 6 time, the Schmidt trigger output pin 7 that operational amplifier U2B is formed exports high level.Relay K 3 action, switch pin 1 is switched to by normally closed pin 2 and often opens unsettled pin 3.Inside triode energization pins 12,13 zero setting of first processor SG3524N, first processor SG3524N outputs signal zero setting, and inversion work stops, and namely enters under-voltage protection.
In described under-voltage protecting circuit; DC source DC12V is connected with resistance R50; 4 pin of a road concatenation operation amplifier U2B after resistance R50; another road is divided into 3 tunnels again; lead up to after electric capacity C15 and meet GND; one road contact resistance R51, another road is connected to resistance R9 and is connected with inverting input 6 pin of operational amplifier U2B with after the series connection of resistance R56.Electric capacity C18 and accurate adjustable resistance W5 is also connected on amplifier 6 pin, other end common ground.Resistance R51 is connected with the positive pole of resistance R52, electric capacity C19, and resistance R52 connects with voltage-stabiliser tube D50 rear and is connected in resistance R53, electric capacity C50 two ends.Resistance R55 concatenation operation amplifier U2B output pin 7 and in the same way output 5, and be connected with resistance R54, the resistance R54 other end is connected on the positive pole of electric capacity C50.Operational amplifier U2B output pin 7 is connected with the control pin 4 of relay K 3, and electric capacity C16 is parallel between the control pin 4,5 of relay K 3, control pin 5 common ground of electric capacity C19, electric capacity C50, voltage-stabiliser tube D50 positive pole, resistance R53, relay K 3.
Described civil power switches with charging circuit, be linked in switching controls relay K 4 switch pin after L7812CV voltage stabilizing by the voltage signal of DC source, when mains voltage is linked into Schmidt trigger inverting input after resistance, electric capacity, after comparing with the reference voltage of in-phase end, by the first Schmidt trigger control relay K4 action, square wave control signal energization pins 12,13 pin controlling first processor SG3524N is disconnected, makes first processor SG3524N export control signal zero setting.Meanwhile, after relay K 4 action, mains voltage is through relay K 4 pin 1,3 cut-in relay K1 pin 2, and pin 2 meets Circuit Fault on Secondary Transformer output OUT3, and circuit breaker K1 pin 3 meets Circuit Fault on Secondary Transformer output port OUT5.On the other hand, alternating voltage accesses the second Schmidt trigger in-phase end after resistance R33, diode D19 rectification, accurate adjustable resistance W3 dividing potential drop, after comparing with end of oppisite phase reference signal, obtain a high level at the second Schmidt trigger output and control triode Q4 conducting, and then control relay K1 action, alternating voltage, through relay K 1 pin, inputs from Circuit Fault on Secondary Transformer, obtain low-voltage ac voltage at transformer primary side, after rectifying and wave-filtering, give DC source charge in batteries.Mains electricity cut-in relay K1 pin 3 simultaneously, after transformer side secondary side self coupling transformation, obtain mains electricity at secondary side output OUT5, final output port OUT switches to mains-supplied.
Described high pressure switches with protective circuit; the ac square-wave voltage obtained by feedback dividing potential drop is through diode D30, electric capacity C7 rectifying and wave-filtering; again after resistance R21, resistance R22, resistance R23, electric capacity C8 filtering, voltage-stabiliser tube D12 voltage stabilizing, between resistance R22 and resistance R23, obtain the end of oppisite phase that a stable reference voltage is connected on the operational amplifier U1C forming Schmidt trigger.The feedback direct current signal of diode D30 negative pole is at the control pin 8 through relay K 1, after pin 7, through diode D20, resistance R44, after accurate adjustable resistance W4 dividing potential drop, partial pressure value is obtained between resistance R44 and accurate adjustable resistance W4, the in-phase end of operational amplifier U1C is accessed through resistance R30, after comparing with the reference voltage of end of oppisite phase, the conducting that a high level controls triode Q5 is exported at output, and then the action of control relay K2, accurate adjustable resistance W4 is controlled sets up fixed homophase comparative voltage size, the i.e. action critical value of control relay, when feedback voltage is too high, relay K 2 switch pin connects the less output of the Circuit Fault on Secondary Transformer number of turn, reach and control high pressure and be switched to control action compared with low pressure.If feedback voltage is too high; because inversion alternating voltage is directly proportional to DC source voltage; the high tension protection circuit that voltage stabilizing didoe D5 and triode Q1 forms is accessed between DC source DV12V and first processor SG3524N lock-in control pin 10; when DC source voltage is too high; voltage accesses triode Q1 base stage through voltage-stabiliser tube D5; triode Q1 conducting; 10 pin of first processor SG3524N are set high level by voltage signal; the zero setting of first processor SG3524N control signal, inversion work stops reaching overvoltage protection effect.
Described civil power switches and switches with protective circuit with charging circuit, high pressure, and DC source DV12V is connected on the input pin of pressurizer L7812CV after resistance R14, is connected on 4 pin of latching relay K4 in parallel after pressurizer output pin connecting resistance R49.Circuit Fault on Secondary Transformer alternating current source AC12V AC port is connected with diode D30, field effect transistor interface CMOS5.Voltage-stabiliser tube D30 is connected with electric capacity C7 positive pole, resistance R21, resistance R48, ground connection after contact resistance R22, resistance R23 after resistance R21, to connect two ends shunt capacitance C8 at resistance R22 with resistance R23.Voltage-stabiliser tube D12 negative pole is connected with electric capacity C8 positive pole, electric capacity C8 negative pole, voltage-stabiliser tube D12 positive pole, electric capacity C7 negative pole common ground GND2.Obtain between resistance R22 and resistance R23 dividing potential drop respectively with 4 inverting inputs of another sheet operational amplifier U1A namely: 2,6,9,13 pins.4 pin of the negative pole concatenation operation amplifier U1A of diode D30, as the power supply source of operational amplifier U1A, connect electromagnetic relay K1, control pin 5 pin of electromagnetic relay K2 and control pin 8 pin of electromagnetic relay K4 simultaneously.The pin 1,3,5,7 of relay K 4 is connected on switch port CD (R), CD (L), NB (R) respectively with on resistance R45, CD (R), CD (L), NB (R), NB (L) are 4 ports of switch, when switch is beaten to one end, port CD (R), CD (L) are closed, port NB (R), NB (L) disconnect, otherwise, when switch is beaten to the other end, port CD (R), CD (L) disconnect, and port NB (R), NB (L) are closed.Resistance R45 connects collector electrode 1 pin of triode Q3, triode Q3 grounded emitter GND2.Relay K 4 pin 3 is connected with the switch pin 1 of resistance R33, electromagnetic relay K1, the resistance R33 other end is connected with diode D19 positive pole, accurate adjustable resistance W3 is connected on D19 negative pole, and ground connection GND2 after accurate adjustable resistance W3 pin 2 is connected with 3, electric capacity C12 is parallel to W3 two ends.Resistance R34 is connected between the in-phase end pin 10 of operational amplifier U1C and D19 negative pole, resistance R35 connects pin 10 and output pin 8, resistance R36 connects the base stage of output pin 8 and triode Q4, the grounded emitter GND2 of triode Q4, collector electrode connects 4 pin of relay K 1 by resistance R46, and electric capacity C14 is parallel between the control pin 4,5 of relay K 1.
Described civil power switches and charging circuit, high pressure switch with protective circuit; 1 pin contact resistance R24 of relay K 4 and resistance R28; meet diode D15 after resistance R24 again through resistance R26 ground connection GND2, electric capacity C9 is connected in parallel on resistance R26 two ends, wherein electric capacity minus earth.Electric capacity C9 positive pole is connected to the pin 5 of operational amplifier U1B by resistance R25, and the pin 5 of operational amplifier U1B is connected with operational amplifier U1B output pin 7 by resistance R31, and is connected to triode Q3 base stage through resistance R32.The positive pole of resistance R69 concatenation operation amplifier U1B pin 5 and diode D17, the negative pole of diode D17 is connected to the output pin 1 of operational amplifier U1B, resistance R30 connects amplifier output pin 1 and in-phase input end pin 3, pin 3 is connected to the negative pole of diode D16, the other end of the positive pole of electric capacity C10 and resistance R27, resistance R27 and electric capacity C10 common ground GND2 by resistance R29.
Described civil power switches and charging circuit, high pressure switch with protective circuit; the positive pole of diode D20 is connect after relay K 4 pin 7 contact resistance R45; the negative pole of diode D20 is connected to the positive pole of electric capacity C11 by resistance R44, be connected between resistance R44 and GND2 after electric capacity C11 is in parallel with accurate adjustable resistance W4.Resistance R40 is connected between resistance R44 and electric capacity C11, and the other end is connected on the in-phase input end pin 12 of operational amplifier U1D, and resistance R41 connects pin 12 and operational amplifier U1D output pin 14.Resistance R37 connects the base stage of pin 14 and triode Q5, triode grounded emitter GND2, and collector electrode is connected with the control pin 4 of relay K 2 by resistance R47, and electric capacity C13 is parallel between the control pin 4,5 of relay K 2, and electric capacity C13 positive pole connects pin 5.Finally, the pin 2 of relay K 1 is connected to Circuit Fault on Secondary Transformer number of turn port OUT3, pin 3 is connected with Circuit Fault on Secondary Transformer number of turn port OUT5, OUT5 is connected on the pin 2 of relay K 2 simultaneously, the pin 1 of relay K 2, as final output pin, passes through resistance R20, electric capacity C6 ground connection GND2 simultaneously.The pin 3 of K2 is connected with Circuit Fault on Secondary Transformer number of turn port OUT4, and is connected between resistance R44 and electric capacity C11 positive pole by resistance R39, diode D18.
Its course of work is as described below: in control circuit, adopt PMW voltage stabilizing to control first processor SG3524N produce two square waves replaced, its phase 180 °.D. c. voltage signal after first processor SG3524N pin 1 accesses from inversion after full-bridge rectification.Have adjustable precision resistance in a feedback circuit, the control pulse duty cycle that first processor SG3524N is exported is adjustable 0-45 ° of scope.At pin 10 connecting triode and the voltage-stabiliser tube overvoltage crowbar of first processor SG3524N; when the direct voltage inputted is greater than 16V time; first processor SG3524N enters blocking, and first processor SG3524N stops exporting control square wave, and operating circuit stops immediately.In under-voltage protecting circuit; use the direct voltage of input through same, the inverting amplifier of two punishment stream difference concatenation operation amplifier U2B; make when voltage is lower than certain value; operational amplifier U2B circuit exports high level and drives low-voltage relay work; cut off the alternating square wave supply power voltage of first processor SG3524N; make two control waveform voltages be all 0, work stops.Switch with charging circuit at civil power, use small-sized latching relay commutation circuit working point, when civil power accesses, inverter circuit is removed, access civil power carries out the dynamic load of power supply band, simultaneously civil power 220V sine wave access Circuit Fault on Secondary Transformer, obtains a level and smooth direct voltage and charges to storage battery after primary side entered Half bridge rectifier and filtering.Finally; high pressure switches and protective circuit uses operational amplifier U1C and electromagnetic relay to judge and action high pressure; different number of turn points is switched in Circuit Fault on Secondary Transformer; employ accurate adjustable resistance in circuit; corresponding resistance can be set according to output requirement, output voltage is met the demands.
DC source DC12V is linked into the pin 15 of first processor SG3524N after pressurizer L7812CV voltage stabilizing, electric capacity C5 filtering, voltage obtains+5V voltage after the benchmark pressurizer voltage stabilizing of inside, part unit in first processor SG3524N is powered, also externally provide+5V reference voltage by pin 16, the voltage at pin 16 place obtains dividing potential drop and is supplied to pin 2 as internal error amp reference voltage after electric capacity C1 filtering between resistance R1 and resistance R2 simultaneously.Pin 1 fetches the feedback voltage from diode D16, feedback voltage is by full-bridge rectification diode D7, diode D8, diode D9 and diode D10 rectification, through resistance R85, resistance R8 and accurate adjustable resistance W2 dividing potential drop obtain, by the resistance size of adjustment precision adjustable resistance W2, the voltage of variable size can be obtained at pin 1 place, and then compare with the sawtooth waveforms of first processor SG3524N inside after being amplified by error amplifier, obtain the control square wave that duty ratio is adjustable.The output voltage of pressurizer L7812CV is linked into the pin 4 of relay K 4 after resistance R49, pin 4 and pin 5 are normally closed points, pin 5 is again through switch breakpoint NB (R), NB (L), the normally closed pin 1 of relay K 3, pin 2, resistance R15 powers, as the power supply source of the final control signal output pin of first processor SG3524N to two transistor collector pins 12, pins 13 in first processor SG3524N.Control square wave through the inner PWM comparator of first processor SG3524N, trigger and two NOR gate relatively after export final control square wave at the pin 11 of first processor SG3524N, pin 14, pin 11, pin 14 are the emitter of pin 12, the corresponding triode of pin 13 respectively.
Under-voltage protection: DC source DC12V powers to the pin 4 of operational amplifier U2B through resistance R50; simultaneously compare end accessing the same, anti-phase of operational amplifier U2B after resistance, capacitance network respectively; operational amplifier U2B is a Schmidt trigger; a Voltage Reference end is obtained at the pin 5 of operational amplifier U2B; under the effect of voltage-stabiliser tube D50; DC source voltage declines, and the voltage at in-phase output end pin 5 place is almost constant.Meanwhile, the voltage at anti-phase pin 6 place is obtained by accurate adjustable resistance W5 dividing potential drop, electric capacity C18 filtering.When DC source voltage declines, the voltage follow at pin 6 place declines, and the voltage at pin 5 place is almost constant, when DC source voltage is reduced to the fixed value of setting, the voltage at anti-phase pin 6 place is lower than the voltage at in-phase input end pin 5 place, operational amplifier U2B action, obtain high level at pin 7 place and make relay K 3 action after electric capacity C16 filtering, relay switch pin and Chang Kai unsettled pin 3 position, cut off first processor SG3524N pin 12, the power supply of 13, it is all low level that first processor SG3524N exports control signal, inverter stops exporting, namely under-voltage protection is entered.
Civil power switches and charging: civil power 220V exchanges and is connected between switch port CD (R) and earth point GND2, when CD (R) accesses 220V alternating voltage, under the effect through diode D15 one-way conduction, between resistance R24 and resistance R26, obtain dividing potential drop, then be linked into the in-phase input end pin 5 of operational amplifier U1B through resistance R25.2,6,9,13 pins of operational amplifier U1B are four inner reversed input pins respectively, the voltage at four pin places is all obtained by the feedback circuit in Fig. 4 lower right corner, is obtaining a stable and identical reference voltage through diode D30 rectification, voltage-stabiliser tube D12 voltage stabilizing, electric capacity C17 after electric capacity C8 filtering, electric resistance partial pressure at four pin places.When voltage higher than pin 6 place of the voltage at operational amplifier U1B pin 5 place, the Schmidt trigger that operational amplifier UIB is formed exports high level at pin 7, triode Q3 base stage is entered after resistance R32, triode Q3 conducting, relay K 4 action, switch pin 1,4 is switched to respectively often opens pin 3,6.Now, the circuit disconnection that switch port NB (R) is front, the pin 12,13 of first processor SG3524N is powered and is stopped, and exports control signal zero setting inversion and stops.Meanwhile, alternating current 220V voltage accesses resistance R33 and relay K 1 switch pin 1 place through relay K 4 pin 1, pin 3, under diode D19 one-way conduction, electric capacity C12 filter action, become d. c. voltage signal.Resistance R34 obtains the in-phase input end pin 10 that dividing potential drop is linked into operational amplifier U1C between diode D19 and precision resistance, after comparing with the reference voltage of pin 9, high level signal is exported at output pin 8, triode Q4 base stage high level is made through resistance R36, triode Q4 conducting, relay K 1 step switch is switched to pin 3.The accurate adjustable resistance W3 comparative voltage making adjustments pin 10 place, and then control whether turn-on transistor Q4, i.e. control relay K1 whether action.The pin 2 of K1 meets Circuit Fault on Secondary Transformer output port OUT3, pin 3 Circuit Fault on Secondary Transformer output port OUT5, after turning through transformer first and second side, low-voltage alternating-current sine voltage is obtained, through being linked into after rectifying and wave-filtering in DC source storage battery for charging at former transformer primary side.Mains electricity cut-in relay K1 pin 3 simultaneously, after transformer side secondary side self coupling transformation, obtain mains electricity at secondary side output OUT5, final output port OUT switches to mains-supplied.
High pressure switches and protection: feedback voltage pile warp relay K 4 after diode D30 rectification, capacitor filtering controls pin 8, pin 7, after diode D20, obtains a stable voltage signal between resistance R44 and accurate adjustable resistance W4.Be winding coil between the pin 7 of voltage K1, pin 8, there is voltge surge inhibitory action simultaneously.Voltage signal is linked into operational amplifier U1C homophase pin 12 through resistance R40, high-level control signal is obtained at output pin 14 after comparing with the reference voltage on pin 13, triode Q5 base stage sets high level, triode Q5 conducting, relay K 2 action, switch pin 1 is switched to often opens pin 3.In like manner, whether relay K 2 action is subject to the control of accurate adjustable resistance W4, when too high according to feedback voltage setting inverter output voltage, and relay K 2 action, final voltage output end meets Circuit Fault on Secondary Transformer output port OUT4 by K2 pin, exports with the voltage after declining.When the voltage set is not high, feed back to the voltage of signal lower than 13 pins of operational amplifier U1C, operational amplifier U1C output low level, relay K 2 is failure to actuate, and final output voltage is the voltage at Circuit Fault on Secondary Transformer output port OUT5 place.When output voltage is still too high after relay K 2 action, voltage due to inverter is controlled by the voltage of DC source, high tension protection circuit is provided with between the pin 10 and DC source DC12V of the first processor SG3524N of Fig. 2, when DC source voltage is too high, after voltage-stabiliser tube D5, obtain high level impel triode Q1 conducting, voltage is through resistance R10, diode D4 connects the pin 10 of first processor SG3524N, pin 10 is lock-in control pins, when exporting high level, first processor SG3524N quits work, inversion stops, namely operating circuit enters overvoltage protection state.
Every technical staff's notice: although the utility model describes according to above-mentioned embodiment; but invention thought of the present utility model is not limited in this utility model; the repacking of any utilization inventive concept, all will include in this patent scope of patent protection.
Claims (4)
1. one kind has the inverter of novel protected circuit, comprise PWM voltage stabilizing and feedback pulse width control circuit, under-voltage protecting circuit, civil power switches and charging circuit, high pressure switches and protective circuit, it is characterized in that: described PWM voltage stabilizing is connected with under-voltage protecting circuit with the first resistance by DC source with feedback pulse width control circuit, by the first pressurizer, second resistance switches with civil power and is connected with charging circuit, described civil power switches with charging circuit by the first diode, 3rd resistance switches with high pressure and is connected with protective circuit, described PWM voltage stabilizing and feedback pulse width control circuit to be switched with high pressure by first processor and are connected with protective circuit, feedback signal in described PWM voltage stabilizing and feedback pulse width control circuit after inversion by connecing first processor after full-bridge rectification and filtering, in order to control the pulse duty cycle of alternating square wave.
2. the inverter with novel protected circuit according to claim 1, it is characterized in that: in described under-voltage protecting circuit, DC source connects the first operational amplifier through the first resistance and is used as power supply source, on the other hand, first resistance connects the first operational amplifier after connecing the 4th resistance, the 5th resistance, first accurate adjustable resistance is as divider resistance, and the first electric capacity is used as filtering; Through the resistance-capacitance network of over under-voltage protection circuit after another road first resistance connection the 6th resistance, finally connect the first operational amplifier; When DC source voltage declines, the zero setting of first processor output signal, inversion work stops, and namely enters under-voltage protection.
3. the inverter with novel protected circuit according to claim 1, it is characterized in that: described civil power switches with charging circuit, after the first pressurizer voltage stabilizing, switching controls first relay is linked into by the voltage signal of DC source, when mains voltage is linked into the first trigger after resistance, electric capacity, described first trigger controls first processor output signal; On the other hand, alternating voltage accesses the second trigger after the 7th resistance, the second diode rectification, the second accurate adjustable resistance dividing potential drop, and described second trigger controls to switch mains circuit and charging circuit by the first transformer.
4. the inverter with novel protected circuit according to claim 1, it is characterized in that: described high pressure switches with protective circuit, the ac square-wave voltage obtained by feedback dividing potential drop is through the 3rd diode, the second capacitance rectifier filtering, again after the 8th resistance, the 9th resistance, the tenth resistance, the 3rd capacitor filtering, the first voltage-stabiliser tube voltage stabilizing, access the second operational amplifier; The feedback direct current signal of the 3rd diode cathode is after the second relay, after the first diode, the 3rd resistance, the 3rd accurate adjustable resistance dividing potential drop, access the second operational amplifier through the 8th resistance, described second operational amplifier controls high-tension circuit and low-voltage circuit switches; Between DC source and first processor, access the 4th diode and the first triode form high tension protection circuit.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520189528.8U CN204597803U (en) | 2015-03-31 | 2015-03-31 | There is the inverter of novel protected circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520189528.8U CN204597803U (en) | 2015-03-31 | 2015-03-31 | There is the inverter of novel protected circuit |
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| CN204597803U true CN204597803U (en) | 2015-08-26 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105785960A (en) * | 2016-05-17 | 2016-07-20 | 北京航空航天大学 | Energy control system of weak current measurement system in extra high voltage environment |
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2015
- 2015-03-31 CN CN201520189528.8U patent/CN204597803U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105785960A (en) * | 2016-05-17 | 2016-07-20 | 北京航空航天大学 | Energy control system of weak current measurement system in extra high voltage environment |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150826 |