CN103701309B - Frequency conversion equipment supplied by AC/DC electricity system and transducer air conditioning - Google Patents
Frequency conversion equipment supplied by AC/DC electricity system and transducer air conditioning Download PDFInfo
- Publication number
- CN103701309B CN103701309B CN201310634848.5A CN201310634848A CN103701309B CN 103701309 B CN103701309 B CN 103701309B CN 201310634848 A CN201310634848 A CN 201310634848A CN 103701309 B CN103701309 B CN 103701309B
- Authority
- CN
- China
- Prior art keywords
- power supply
- inversion unit
- voltage
- controller
- binding post
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 238000004378 air conditioning Methods 0.000 title claims abstract description 51
- 238000006243 chemical reaction Methods 0.000 title claims abstract description 38
- 230000005611 electricity Effects 0.000 title claims abstract description 26
- 238000013461 design Methods 0.000 claims abstract description 31
- 238000002955 isolation Methods 0.000 claims abstract description 22
- 230000002441 reversible effect Effects 0.000 claims description 15
- 230000002159 abnormal effect Effects 0.000 claims description 10
- 238000012546 transfer Methods 0.000 claims description 9
- 238000005457 optimization Methods 0.000 claims description 5
- 230000007423 decrease Effects 0.000 claims description 4
- 238000005070 sampling Methods 0.000 claims description 4
- 230000001172 regenerating effect Effects 0.000 abstract description 43
- 230000007613 environmental effect Effects 0.000 abstract description 11
- 230000007774 longterm Effects 0.000 abstract description 2
- 239000004065 semiconductor Substances 0.000 description 22
- 238000000034 method Methods 0.000 description 6
- 230000008569 process Effects 0.000 description 6
- 238000004134 energy conservation Methods 0.000 description 4
- 238000011217 control strategy Methods 0.000 description 3
- 230000001276 controlling effect Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 230000001105 regulatory effect Effects 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 239000003990 capacitor Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000011897 real-time detection Methods 0.000 description 2
- 206010014357 Electric shock Diseases 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000036581 peripheral resistance Effects 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 230000003313 weakening effect Effects 0.000 description 1
Abstract
The invention discloses a kind of frequency conversion equipment supplied by AC/DC electricity system and transducer air conditioning, comprise DC power supply binding post, ac power supply terminal, direct current sample circuit and controller; Described ac power supply terminal connects the DC bus-bar voltage input of the first inversion unit by the first rectifier bridge; Described DC power supply binding post is connected the DC bus-bar voltage input of the first inversion unit successively by the second inversion unit, isolating transformer and the second rectifier bridge; The direct voltage that the collection of described direct current sample circuit is inputted by DC power supply binding post, and export described controller to by DC-isolation converter.The present invention is by design supplied by AC/DC electricity system, the frequency conversion equipments such as transducer air conditioning are made not only can directly to use electric main to power, the direct current energy that also public direct-current electrical network or regenerative resource can be used to send directly is powered, not only can meet the work requirements of the long-term continuous service of frequency conversion equipment, also make frequency conversion equipment environmental protection more.
Description
Technical field
The invention belongs to frequency conversion system technical field, specifically, the transducer air conditioning relating to a kind of electric supply system for providing power supply to supply for frequency conversion equipment and adopt described electric supply system to design.
Background technology
Along with the application of solar energy, wind energy and geothermal energy, the area of regenerative resource power supply in global range, is used to get more and more.The electric energy sent due to regenerative resource is direct current mostly, and existing most electric equipment requirement access is Alternating Current Power Supply, therefore, in order to can simply and easily the direct current energy that regenerative resource produces be used fully, the direct current energy that regenerative resource produces mainly is transformed into AC energy by current solution, then being incorporated to electric main electrical network, is that various power electrical apparatus uses by utility grid.
But, the electric company that this grid-connected power-supply service scheme is only applicable to various countries uses, and need to drop into high construction cost, build regenerative resource transformer station, to realize the supply of regenerative resource to traditional energy, no matter lay from substation site selection in earlier stage and electrical network, or from power grid maintenance in the future, all there is difficulty in various degree.And, the country of public direct-current electrical network is configured with for some or has set up alone the enterprise or the family that have regenerative resource power supply equipment, existingly only support that the electric equipment of Alternating Current Power Supply also cannot be made full use of these energy, just cause the utilance of public direct-current electrical network and regenerative resource obviously not enough thus.
Summary of the invention
The object of the present invention is to provide a kind of frequency conversion equipment supplied by AC/DC electricity system supporting AC and DC two kinds of powering modes, to realize frequency conversion equipment making full use of the direct current energy that public direct-current electrical network and regenerative resource produce.
For solving the problems of the technologies described above, the present invention is achieved by the following technical solutions:
A kind of frequency conversion equipment supplied by AC/DC electricity system, is provided with DC power supply binding post, ac power supply terminal, direct current sample circuit, controller and the first inversion unit for DC bus-bar voltage being reverse into Alternating Current Power Supply needed for AC load; Described ac power supply terminal sub-connection first rectifier bridge, is rectified into the DC bus-bar voltage input of transmitting DC to the first inversion unit by the AC power of access by the first rectifier bridge; Described DC power supply binding post connects the second inversion unit, the DC power supply of access being reverse into AC power by the second inversion unit transfers to after isolating transformer carries out the isolated variable of voltage, exports the second rectifier bridge to be rectified into the DC bus-bar voltage input that DC power supply exports described first inversion unit to; Described direct current sample circuit gathers the direct voltage by described DC power supply binding post input, and after being isolated by DC-isolation converter, export described controller to, between AC and DC two kinds of powering modes, carry out switching controls by controller.
Be in the frequency conversion equipment process of powering selecting direct current supply pattern, in order to the DC power supply blocking the first rectifier bridge exports, the present invention is arranged through the voltage peak of voltage magnitude higher than the AC power by the access of ac power supply terminal of the DC power supply that described second rectifier bridge rectification exports, thus make the diode element in the first rectifier bridge reverse-biased, cut off ac power supply line.
Further, according to the sampled voltage of DC-isolation converter isolation and amplifier, described controller judges that whether the DC power supply accessed by DC power supply binding post is normal, and when detecting that described DC power supply is abnormal, control the second inversion unit out of service, turn by the ac power supply of outside, realize the seamless switching of direct current supply to Alternating Current Power Supply thus.
Further again, in described supplied by AC/DC electricity system, be also provided with alternating current sampling circuit, gather the magnitude of voltage of the AC power by the access of ac power supply terminal, and transfer to described controller; Described controller, when detecting that the DC power supply of access and AC power are all abnormal, controls the first inversion unit and the second inversion unit is out of service, cuts off the power supply to AC load, to protect AC load from damage.
In order to improve the power factor of frequency conversion equipment, also booster circuit is connected with between described first rectifier bridge and the first inversion unit, described booster circuit receives the pulse signal that controller exports, and the direct current that the first rectifier bridge rectification exports is carried out to DC boosting conversion and carries out phasing to alternating voltage, electric current; Described booster circuit is by the DC bus-bar voltage input of the first extremely described for the DC power transmission after boosting inversion unit.
In order to realize the seamless switching from direct current supply to Alternating Current Power Supply, according to the sampled voltage that DC-isolation converter exports, described controller judges that whether the DC power supply accessed by DC power supply binding post is normal, and when detecting abnormal, first booster circuit startup optimization is controlled, the conducting duty ratio exporting the pulse signal of booster circuit to is increased to required conducting duty ratio gradually from 0, and during this period in, the conducting duty ratio exporting the pulse signal of the second inversion unit to is reduced gradually, until be 0, thus it is out of service to control the second inversion unit, powering mode is switched seamlessly to Alternating Current Power Supply pattern by direct current supply pattern.DC bus-bar voltage can be realized thus and variable-frequency electric stream seamlessly transits and do not occur impact phenomenon.
In order to realize the seamless switching from Alternating Current Power Supply to direct current supply, in described system cloud gray model is during Alternating Current Power Supply pattern, if controller detects that the DC power supply accessed by DC power supply binding post recovers normal, then first control the second inversion unit to put into operation, the conducting duty ratio exporting the pulse signal of the second inversion unit to is increased to required conducting duty ratio gradually from 0, and during this period in, the conducting duty ratio exporting the pulse signal of booster circuit to is reduced gradually, until be 0, thus it is out of service to control booster circuit, powering mode is switched seamlessly to direct current supply pattern by Alternating Current Power Supply pattern.
Based on above-mentioned frequency conversion equipment supplied by AC/DC electricity system, the invention allows for a kind of transducer air conditioning adopting described supplied by AC/DC electricity system, comprising DC power supply binding post, ac power supply terminal, direct current sample circuit, controller and the first inversion unit for DC bus-bar voltage being reverse into Alternating Current Power Supply needed for AC load; Described ac power supply terminal sub-connection first rectifier bridge, is rectified into the DC bus-bar voltage input of transmitting DC to described first inversion unit by the first rectifier bridge by the AC power of access; Described DC power supply binding post connects the second inversion unit, the DC power supply of access being reverse into AC power by the second inversion unit transfers to after isolating transformer carries out the isolated variable of voltage, exports the second rectifier bridge to be rectified into the DC bus-bar voltage input that DC power supply exports described first inversion unit to; Described direct current sample circuit gathers the direct voltage by described DC power supply binding post input, and after being isolated by DC-isolation converter, export described controller to, between AC and DC two kinds of powering modes, carry out switching controls by controller; Wherein, described AC load is the compressor in air conditioner; When air conditioner operates in Alternating Current Power Supply pattern, and design temperature is when differing more than 5 DEG C with ambient temperature and need compressor high frequency to run, if the direct voltage exported by the first rectifier bridge rectification is lower than the DC bus-bar voltage met required for compressor operating frequency, then keep existing DC bus-bar voltage constant, control compressor weak magnetic speed-up, high frequency needed for realization runs, fast ambient temperature is adjusted to design temperature.
Adopt the transducer air conditioning of above-mentioned supplied by AC/DC electricity system, its power factor is generally below 0.95.In order to improve the power factor of frequency-variable controller, it is made to reach more than 0.95, the invention allows for the supplied by AC/DC electricity system of another transducer air conditioning, comprising DC power supply binding post, ac power supply terminal, direct current sample circuit, controller and the first inversion unit for DC bus-bar voltage being reverse into Alternating Current Power Supply needed for AC load; Described ac power supply terminal sub-connection first rectifier bridge, by the first rectifier bridge, the AC power of access is rectified into transmitting DC to booster circuit, described booster circuit receives the pulse signal that controller exports, and the direct current that the first rectifier bridge rectification exports is carried out to DC boosting conversion and carries out phasing to alternating voltage, electric current; Described booster circuit is by the DC bus-bar voltage input of the first extremely described for the DC power transmission after boosting inversion unit; Described DC power supply binding post connects the second inversion unit, the DC power supply of access being reverse into AC power by the second inversion unit transfers to after isolating transformer carries out the isolated variable of voltage, exports the second rectifier bridge to be rectified into the DC bus-bar voltage input that DC power supply exports described first inversion unit to; Described direct current sample circuit gathers the direct voltage by described DC power supply binding post input, and after being isolated by DC-isolation converter, export described controller to, between AC and DC two kinds of powering modes, carry out switching controls by controller; Wherein, described AC load is the compressor in air conditioner.
In order to improve the stability that transducer air conditioning runs, in during described transducer air conditioning operates in direct current supply pattern, if controller detects that the voltage magnitude of the DC power supply accessed by DC power supply binding post drops to early warning line, now, if design temperature differs more than 5 DEG C with ambient temperature, then controller switches seamlessly to Alternating Current Power Supply pattern immediately; If design temperature differs with ambient temperature within 5 DEG C, then first control compression low-frequency operation, and detect the fluctuation situation of the DC power supply accessed by DC power supply binding post in real time, if the voltage magnitude of the DC power supply of access continues to decline, lower than the lower limit of setting, then controller switches seamlessly to Alternating Current Power Supply pattern immediately.
Compared with prior art, advantage of the present invention and good effect are mainly reflected in following several respects:
1, the present invention is by design supplied by AC/DC electricity system, the frequency conversion equipments such as transducer air conditioning are made not only can directly to use electric main to power, the direct current energy that also public direct-current electrical network or regenerative resource can be used to send directly is powered, for the frequency conversion equipment needing long-term continuous service, the work requirements that it runs without interruption for a long time can be met undoubtedly better;
2, when the present invention carries out selection switching between AC and DC two kinds of powering modes, preferred employing is that equipment is powered by the direct current energy that regenerative resource sends, and only when DC power supply can not meet the power reguirements of equipment, just switch seamlessly to traditional Alternating Current Power Supply pattern, thus achieve the utilization to greatest extent of regenerative resource, make frequency conversion equipment environmental protection and energy-conservation more;
3, the present invention by arranging isolating transformer in direct current supply line, and DC-isolation converter is set in direct current sample circuit, thus make the power supply circuits of DC power supply and exchange the power supply circuits netted in city and realize electrical isolation completely, avoid electric main and seal in DC power supply binding post, cause ac power supply line, by frequency converter and DC power supply, alternate short circuit occurs, and then the problem causing frequency conversion equipment to be damaged occurs, ensure that device for electric safety;
4, the present invention's difference of DC power supply that can provide according to public direct-current electrical network or regenerative resource, suitable configuration is carried out to the no-load voltage ratio of isolating transformer, thus adapt to the DC power supply that different public direct-current electrical network or regenerative resource send, to expand the applicable situation of frequency conversion equipment.
After reading the detailed description of embodiment of the present invention by reference to the accompanying drawings, the other features and advantages of the invention will become clearly.
Accompanying drawing explanation
Fig. 1 is the circuit theory diagrams of a kind of embodiment of frequency conversion equipment supplied by AC/DC electricity system proposed by the invention;
Fig. 2 is the circuit theory diagrams of another embodiment of frequency conversion equipment supplied by AC/DC electricity system proposed by the invention.
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in detail.
The present invention can the brand-new powering mode of incoming transport and direct current two kinds of power supplys in order to make frequency conversion equipment only support that the single powering mode of the tradition of Alternating Current Power Supply is transitioned into from the past, the basis of the ac power supply line of existing frequency conversion equipment increases a road direct current supply line, for receiving the DC power supply sent by outside public direct-current electrical network or regenerative resource, thus achieve regenerative resource making full use of on frequency conversion equipment, make frequency conversion equipment energy-saving and environmental protection more.
Below for transducer air conditioning, by a specific embodiment, the concrete assembling structure of supplied by AC/DC electricity system proposed by the invention and operation principle thereof are described in detail.
Shown in Figure 1, the present embodiment arranges two groups of power supply terminals on transducer air conditioning: one group is ac power supply terminal X1, the X2 for connecting electric main electrical network, and another group is DC power supply binding post X21, X22 of DC power supply of sending for connecting public direct-current electrical network or access regenerative resource.Described ac power supply terminal X1, X2 connect the first rectifier bridge A1, the single-phase full bridge rectification circuit be such as formed by connecting by four diodes, for the AC power by sub-X1, X2 access of ac power supply terminal is rectified into DC power supply, transfer to booster circuit, and then by booster circuit DC boosting conversion is carried out to the DC power supply that rectification exports and to after alternating voltage, current phase correction, form DC bus-bar voltage, export the DC bus-bar voltage input of the first inversion unit to.Described first inversion unit is used for DC bus-bar voltage being reverse into the alternating voltage that AC load runs required frequency, in transducer air conditioning, AC load is powered.
In the present embodiment, described AC load specifically can refer to the compressor M in transducer air conditioning.Because compressor M selected in current transducer air conditioning needs three-phase alternating-current powered mostly, therefore, when design the first inversion unit, six semiconductor switch device V11-V16(such as six IGBT high-power switch tubes etc. should be selected) be connected to form three-phase inverting circuit, so that DC bus-bar voltage is reverse into three-phase alternating voltage, for the three phase alternating current motor in compressor M is powered.
In order to control compressor M converting operation, the switching sequence of a micro-chip processor MCU to each semiconductor switch device V11-V16 in three-phase inverting circuit can be selected accurately to control control end (such as the grid of IGBT high-power switch tube) the connection control device D1 of six semiconductor switch device V11-V16, described controller D1.As a kind of preferred design of the present embodiment, described controller D1 is according to the design temperature of air conditioner and current ambient temperature, calculate the operating frequency of compressor M, and then the pwm signal of suitable duty ratio is generated according to the operating frequency calculated, export the control end of six semiconductor switch device V11-V16 to, by controlling the break-make sequential of each semiconductor switch device V11-V16, the three-phase alternating-current supply of required frequency is generated with inversion, export compressor M to, and then realize the adjustment to compressor M operating frequency.
For described booster circuit, the present embodiment preferably adopts a semiconductor switch pipe V1 to coordinate inductance L 1 and diode V2 to be formed by connecting, shown in Figure 1.The present embodiment is described for high-power IGBT pipe as described semiconductor switch pipe V1.Between the positive pole described inductance L 1 being connected to the first rectifier bridge A1 DC output side and the anode of diode V2, the negative electrode of diode V2 connects the DC bus-bar voltage input of the first inversion unit, and by electrochemical capacitor C1 ground connection.By the grid connection control device D1 of high-power IGBT pipe V1, receive the control signal (such as pulse signal) that controller D1 exports, collector electrode connects the anode of diode V2, grounded emitter.The amplitude requirement of the DC bus-bar voltage of controller D1 needed for the first inversion unit and the demand to AC power power factor, generate the grid of output of pulse signal to high-power IGBT pipe V1 of corresponding duty ratio, by the switching frequency of control high-power IGBT pipe V1 and the phase relation of alternating voltage, thus the DC power supply boosting inverter exported by the first rectifier bridge A1 rectification is become the DC bus-bar voltage needed for the first inversion unit, about about 400V, to meet the power demands of the first inversion unit.
Also sample circuit is connected with at the DC bus-bar voltage input of the first inversion unit, two divider resistances R3, R4 specifically can be adopted to be connected between DC bus-bar voltage input, the intermediate node of divider resistance R3, R4 is connected to controller D1, after utilizing two divider resistances R3, R4 to carry out dividing potential drop to the DC bus-bar voltage that the first inversion unit receives, export partial pressure value Vdc to controller D1, and then realize the sampling of controller D1 to DC bus-bar voltage.Controller D1 is according to the sampled value Vdc of the DC bus-bar voltage received, converse actual DC bus-bar voltage amplitude, and then by the switching frequency of adjustment IGBT pipe V1 and the phase relation of alternating voltage, in the amplitude that the DC bus-bar voltage exported by booster circuit is stabilized in required by the first inversion unit.
The direct current supply receiving outside public direct-current electrical network or regenerative resource to enable transducer air conditioning and provide, to reduce the use to electric main, the present embodiment is also provided with the second inversion unit, isolating transformer T21 and the second rectifier bridge A2 on the power panel of transducer air conditioning, shown in Figure 1.Described second inversion unit is connected DC power supply binding post X21, X22, receive the direct current supply by DC power supply binding post X21, X22 access, and be reverse into AC power and export isolating transformer T21 to, and then isolated variable becomes high-voltage ac power to transfer to the second rectifier bridge A2.Isolating transformer T21 is converted the high-voltage ac power exported and is rectified into high-voltage DC power supply (greatly about about 400V) by described second rectifier bridge A2, exports the first inversion unit to, for the first inversion unit provides DC bus-bar voltage.
In the present embodiment, described second inversion unit preferably adopts four semiconductor switch device V21-V24 to connect into single-phase inversion circuit, for the DC power supply accessed by DC power supply binding post X21, X22 is reverse into single phase alternating current power supply, export the former limit of isolating transformer T21 to.Described four semiconductor switch device V21-V24 can select IGBT high-power switch tube to carry out circuit design, as shown in Figure 1.By control end (such as the grid of IGBT high-power switch tube) the connection control device D1 of four semiconductor switch device V21-V24, receive the pulse signal that controller D1 sends, by controlling the switch conduction duty ratio of four semiconductor switch device V21-V24, to regulate the effective value of the alternating voltage exported by its inversion.
By the AC of the secondary connection second rectifier bridge A2 of described isolating transformer T21, by regulating the no-load voltage ratio of isolating transformer T21, can change and convert by isolating transformer T21 the effective value of alternating voltage exported, and then export DC bus-bar voltage needed for the first inversion unit by the second rectifier bridge A2 with rectification.
The present embodiment by adopting isolating transformer T21 in direct current supply line, DC power-supply circuit and ac power circuit electrical isolation can be made on the one hand, avoid Alternating Current Power Supply to import DC power supply binding post X21, X22 into, cause ac power supply line by frequency converter and DC power supply generation phase fault; On the other hand can by regulating the no-load voltage ratio of isolating transformer T21, the direct current supply making transducer air conditioning go for different public direct-current electrical network or regenerative resource to send.
Switch requirement to meet the selection of transducer air conditioning between two kinds of powering modes, the present embodiment is provided with sample circuit respectively at described ac power supply terminal X1, X2 and DC power supply binding post X21, X22 two ends, shown in Figure 1.Wherein, direct current sample circuit can adopt two divider resistances R21, R22 to be formed by connecting, and coordinates DC-isolation converter A21 to complete voltage sample to the DC power supply accessed by DC power supply binding post X21, X22.Concrete annexation is preferably: first by after two divider resistance R21, R22 series connection, be connected to the two ends of DC power supply binding post X21, X22; Then the intermediate node of divider resistance R21, R22 is connected the input+IN of DC-isolation converter A21, the output+Vo connection control device D1 of DC-isolation converter A21.When having DC power supply to access by DC power supply binding post X21, X22, divider resistance R21, R22 direct voltage to access carries out dividing potential drop, export partial pressure value Vi to DC-isolation converter A21, after carrying out the isolated variable process of DC-to-DC, be sent to described controller D1, realize the voltage sample to input DC power, and then complete the whether abnormal real-time detection of the DC power supply of input.
The present embodiment by arranging isolating transformer T21 in direct current supply line, DC-isolation converter A21 is set in direct current sample circuit, thus makes the power supply circuits of regenerative resource (or public direct-current mains-power circuit) can electrical isolation complete in the mains-power circuit of electric main.So, when not only can avoid any one electrode grounding in the power supply circuits of regenerative resource, the problem of city's net alternating current and regenerative resource power supply circuit shorted to earth is caused, and, even if there is no electrode grounding in the power supply circuits of regenerative resource, also the hot voltage of city's net alternating current can be effectively avoided to seal in two DC electrode in regenerative resource power supply circuit, thus the supply line of the Danger Electric shock risk caused and regenerative resource, the infringement that equipment brings because of the hot voltage of bearing city's net alternating current, significantly improve the fail safe of other electric equipment operations in transducer air conditioning and user family, and multiple family is used to the situation of this system, if each use three-phase alternating-current supply homophase is not powered time, the phase fault problem occurring being formed three phase mains by frequency conversion system and direct current network can also be avoided.
In order to realize detecting to the phase place of the alternating voltage of AC network whether exception and alternating voltage, the present embodiment connects alternating current sampling circuit at the two ends of AC power access terminal X1, X2, as shown in Figure 1, peripheral resistance is coordinated to be formed by connecting primarily of operational amplifier N1, reference power source VREF.Wherein, the live wire X1 of AC power access terminal by the in-phase input end of resistance R1 concatenation operation amplifier N1+, the intermediate node of the in-phase input end of described operational amplifier N1+simultaneously connected by resistance R12 divider resistance R13, R14, described divider resistance R13, R14 are connected between reference power source VREF and ground, after carrying out dividing potential drop to reference power source VREF, for the alternating voltage on live wire provides DC offset voltage.The zero line X2 of AC power access terminal by the inverting input of resistance R2 concatenation operation amplifier N1-, the inverting input of described operational amplifier N1-by feedback resistance R11 connects himself output, described controller D1 is transferred to by output output AC sampled voltage Vac, realize voltage sample to alternating current input power supplying, and then complete the phase-detection to the AC power of input whether abnormal real-time detection and alternating voltage.
The phase place of the direct voltage that the present embodiment utilizes controller D1 to detect to be inputted by regenerative resource, the alternating voltage inputted by utility grid, alternating voltage and input to the DC bus-bar voltage of the first inversion unit, and pass through computing and the logical process of controller D1, export pulse control signal, the semiconductor switch device controlled in the first inversion unit, the second inversion unit and booster circuit is opened or is turned off, and then realize when the DC power supply of regenerative resource output is normal, the DC power supply exported by regenerative resource is that transducer air conditioning is powered; The DC power supply that regenerative resource exports can not normal power supply time, if city's net alternating current is normal, Ze Zhuanyou city net alternating current provides electric energy; In the process of city's net AC-powered, the DC power supply that regenerative resource exports if detect recovers normal, then again switch back regenerative resource power supply; If regenerative resource and city's net alternating current all can not normal power supply time, then control transducer air conditioning out of service.The present embodiment is auxiliary by designing the powering mode of transducer air conditioning based on the Alternating Current Power Supply of the direct current supply of regenerative resource, utility grid, thus achieves the effective use of regenerative resource to greatest extent, makes transducer air conditioning environmental protection more, energy-conservation.
Below in conjunction with Fig. 1, the specific works principle of the supplied by AC/DC electricity system of the present embodiment is set forth in detail.
First, according to the no-load voltage ratio situation of the actual working characteristics of compressor in transducer air conditioning and the inversion characteristic of the second inversion unit and isolating transformer T21, determine and can meet the voltage range that compressor normally runs required direct current supply, writing controller D1.
Controller D1 transducer air conditioning run during in, by direct current sample circuit detect in real time by DC power supply binding post X21, X22 input direct voltage whether be in the normal range (NR) of setting.If direct voltage is normal, then enable direct current supply pattern, that is, controller D1 outputs control signals to the second inversion unit, controls the second inversion unit startup optimization, and turns off the semiconductor switch pipe V1 in booster circuit.Controller D1 is by the conducting duty ratio of each semiconductor switch device V21-V24 in adjustment second inversion unit, the former limit of isolating transformer T21 is made to obtain the alternating impulse power square wave of required pulse width, carry out after isolation transformation through isolating transformer T21 again, export the second rectifier bridge A2 to and ac voltage rectifier is become direct voltage, export the first inversion unit to, for the first inversion unit provides the DC bus-bar voltage needed for its work.Controller D1 is according to the difference of the design temperature of transducer air conditioning and actual environment temperature, calculate the operating frequency needed for compressor, and then according to the conducting duty ratio of each semiconductor switch device V11-V16 in this frequency adjustment first inversion unit, control the AC power that DC bus-bar voltage is reverse into frequency needed for compressor operating by the first inversion unit, export the power supply terminal of compressor to, drive compressor operating.
In the present embodiment, the waveform peak of the alternating voltage by AC power access terminal X1, X2 access should be greater than by the amplitude of the direct voltage of the second rectifier bridge A2 rectification output.Due to transducer air conditioning be operated in direct current supply pattern during in, controller D1 does not provide conduction pulses to the semiconductor switch pipe V1 in booster circuit, and therefore booster circuit is not to the effect of alternating current input power supplying raising voltage, therefore diode V2 bears reversed bias voltage all the time.Like this, just only have the DC power supply of input to provide DC bus-bar voltage for the first inverter circuit, avoid the use to city's net alternating current.
Because the DC power supply provided for transducer air conditioning can be provided by regenerative resource, therefore make the operation environmental protection more of transducer air conditioning.
When controller D1 detect be reduced to early warning line (magnitude of voltage corresponding to described early warning line be still in the normal range (NR) of setting within) by the direct voltage of DC power supply binding post X21, X22 input time, first judge whether the design temperature of air conditioner and current ambient temperature differ comparatively large, are described for critical value for 5 DEG C.If design temperature and current ambient temperature are more or less the same, such as, within differing 5 DEG C, if now the running frequency of compressor M is lower, then can controls compressor M and keep current operating frequency to continue to run; If the running frequency of compressor M is higher, then first control compressor M low-frequency operation, its running frequency preferably≤30Hz, and observe the fluctuation situation of the direct voltage by DC power supply binding post X21, X22 input simultaneously.If the direct voltage of input no longer reduces, then can maintain current direct current supply pattern; If the direct voltage of input continues to decline, beyond the lower limit of normal range (NR), then Alternating Current Power Supply pattern should be switched to immediately, to ensure that compressor M can continuous service.If be reduced to early warning line by the direct voltage of DC power supply binding post X21, X22 input, and now the design temperature of air conditioner differs again larger with current ambient temperature, such as, when differing more than 5 DEG C, due to when design temperature differs larger with ambient temperature, in order to control environment, temperature can, rapidly close to design temperature, need compressor M high frequency to run.In this case, in order to ensure the continuous operation of air conditioner, need immediately powering mode to be switched to Alternating Current Power Supply pattern, to meet power demands when compressor M high frequency runs.
Switched to by direct current supply pattern in the process of Alternating Current Power Supply pattern by powering mode, in order to realize the seamless switching of two kinds of power supplies, first the present embodiment carries out sample detecting to the AC power by sub-X1, X2 input of ac power supply terminal.If the AC power of input is normal, then controller D1 first output pulse signal to semiconductor switch pipe V1, control booster circuit startup optimization, the conducting duty ratio exporting the pulse signal of booster circuit to is increased to required conducting duty ratio gradually from 0, and during this period in, the conducting duty ratio exporting the pulse signal of the second inversion unit to reduces by controller D1 gradually, until be 0, thus it is out of service to control the second inversion unit, cut off the input of DC power supply, realize supply power mode from direct current supply pattern to the seamless switching of Alternating Current Power Supply pattern.
When air conditioner operates under Alternating Current Power Supply pattern, AC power by sub-X1, X2 input of ac power supply terminal is rectified into DC power supply by the first rectifier bridge A1, export booster circuit to, boosting inverter becomes the DC bus-bar voltage needed for the first inversion unit work, export the DC bus-bar voltage input of the first inversion unit to, and then generate the three-phase alternating-current supply that compressor M runs required frequency, for compressor M powers by the first inversion unit inversion.
During transducer air conditioning operates in Alternating Current Power Supply pattern, controller D1 carries out sample detecting to the DC power supply inputted by DC power supply binding post X21, X22 in real time.If detect, the DC power supply of input comes back in normal range (NR), then first start the second inversion unit, pulse signal is sent to each semiconductor switch device V21-V24 in the second inversion unit, in during the conducting duty ratio controlling described pulse signal is increased to required conducting duty ratio gradually from 0, the conducting duty ratio of the switching pulse signal exporting semiconductor switch pipe V1 in booster circuit to is reduced gradually simultaneously, until be 0, thus it is out of service to control booster circuit, then realize supply power mode from Alternating Current Power Supply pattern to the seamless switching of direct current supply pattern.
When controller D1 detects that the AC power of input is all abnormal with DC power supply; block the pulse signal exporting each semiconductor switch device V11-V16, V21-V24, V1 to immediately; control the first inversion unit, the second inversion unit and booster circuit out of service, to protect the safety of compressor M.
The present embodiment adopts above-mentioned power supply control strategy, make transducer air conditioning regenerative resource can during normal power supply in, the DC power supply using regenerative resource to send completely is powered, and only when DC power supply is abnormal, just turn by traditional electric main mains supply, not only meet the requirement that transducer air conditioning long-time continuous is run thus, and achieve the utilization to greatest extent to regenerative resource.
Above-mentioned supplied by AC/DC electricity system owing to employing booster circuit in ac power supply line, therefore, when air conditioner operates in Alternating Current Power Supply pattern, the phase place according to alternating voltage sends voltage boosting pulse to semiconductor switch pipe V1, and its power factor can reach more than 0.95.Current power factor is less than to the transducer air conditioning of 0.95, owing to not using booster circuit in its ac power supply line, therefore, when introducing the design of the direct current supply line shown in Fig. 1 in this kind of transducer air conditioning, need to adjust accordingly its control strategy.
Specifically, when design power factor is less than the transducer air conditioning of 0.95, after carrying out rectifying conversion by the AC power of sub-X1, X2 access of ac power supply terminal by the first rectifier bridge A1, after electrochemical capacitor C1 filtering, directly export the first inversion unit to, for the first inversion unit provides DC bus-bar voltage.Owing to there is no the DC boosting effect of booster circuit, therefore, when adopting electric main mains supply, the DC bus-bar voltage of the first inversion unit is supplied to approximately only at about 300V.Same design direct current supply line as shown in Figure 1 on the power panel of such transducer air conditioning, namely DC power supply binding post X21, X22, the second inversion unit, isolating transformer T21 and the second rectifier bridge A2 is comprised, shown in Figure 2, after inversion, boosting, rectification process are carried out successively to the DC power supply of outside input, export the direct voltage of about about 400V, for the first inversion unit provides the DC bus-bar voltage needed for its work.
When by direct current sample circuit, controller D1 detects that the direct voltage that regenerative resource exports is in normal range (NR), control the second inversion unit startup optimization, and by regulating the conducting duty ratio of semiconductor switch device V21-V24, when making the direct voltage exported by the second rectifier bridge A2 rectification reach the operation of compressor M high frequency, the amplitude of the DC bus-bar voltage needed for the first inversion unit work.Now, because the amplitude of the DC bus-bar voltage by the second rectifier bridge A2 rectification output is higher than the peak value of city's net alternating voltage waveform, therefore, the diode in the first rectifier bridge A1 is made to bear reversed bias voltage all the time and end.So, just only have the DC power supply of input to provide DC bus-bar voltage for the first inversion unit, lessen the consumption of air conditioner to city's net alternating current thus.
When controller D1 detect drop to early warning line by the direct voltage of DC power supply binding post X21, X22 access time, comparatively greatly whether the difference judging the design temperature of transducer air conditioning and current environmental temperature, be still described for 5 DEG C.If design temperature differs more than 5 DEG C with current environmental temperature, and transducer air conditioning needs high frequency to run, now, the operation of transducer air conditioning can drag down the current potential of DC power supply further, therefore, the conduction pulses duty ratio that controller D1 controls the second inversion unit is immediately reduced to 0 and out of service gradually, switches seamlessly to Alternating Current Power Supply pattern, to ensure that air conditioner can run by normal continuous.If design temperature differs less with current environmental temperature, such as, within 5 DEG C, then maintain the current operating frequency of air conditioner and continue to run, and whether the direct voltage of continuous observation input continues to decline.If the direct voltage of input continues the lower limit dropping to safe range, then controller D1 switches seamlessly to Alternating Current Power Supply pattern immediately, adopts city's net alternating current to continue as air conditioner and powers.
During air conditioner operates in Alternating Current Power Supply pattern, because the DC bus-bar voltage being supplied to the first inversion unit by ac power supply line is lower, may not meet the high frequency service requirement of compressor, thus the present embodiment designs following control strategy:
Controller D1 detects the design temperature of air conditioner and the difference of current environmental temperature, if be more or less the same, such as, within 5 DEG C, then controls compressor M low-frequency operation by the first inversion unit, makes ambient temperature slowly close to design temperature.Now, the DC bus-bar voltage exported by the first rectifier bridge A1 just can meet the job requirement of the first inversion unit completely.When design temperature differs larger with current environmental temperature, such as difference is more than or equal to 5 DEG C, then now need compressor M high frequency to run.Due to compressor M high frequency run time, need to provide higher DC bus-bar voltage to the first inversion unit, now just there will be the direct voltage exported by the first rectifier bridge A1 and can not meet the situation of DC bus-bar voltage needed for the first inversion unit.In order to meet the requirement that compressor M high frequency runs, the present embodiment adopts weak magnetic speed-up technology, controller D1 is utilized to detect the induced potential of compressor M, angle between the back electromotive force calculating permanent magnet synchronous motor in time that provides of the pwm pulse being applied to the first inversion unit and compressor M by running FOC algorithm, by weakening the magnetic field of permanent magnet in motor, make motor produce weak magnetic speed-up, realize high frequency running, the service requirement meeting air conditioner fast-refrigerating or heat.
During air conditioner operates in Alternating Current Power Supply pattern, if controller D1 detects that the DC power supply that regenerative resource exports recovers normal, then switch seamlessly to direct current supply pattern, the regenerative resource continuing to adopt environmental protection is that transducer air conditioning is powered, to save electric main to greatest extent.
Although the APFC that the supplied by AC/DC electricity system shown in Fig. 2 does not have booster circuit to form, it have employed based on regenerative resource direct current supply, city's net Alternating Current Power Supply is equally auxiliary energy-conservation power supply strategy.
Certainly, the circuit design of the supplied by AC/DC electricity system that the present embodiment proposes, except being applied in transducer air conditioning, realizes the green energy conservation of transducer air conditioning, and applicable equally for other frequency conversion equipments, and the present embodiment does not specifically limit this.
It should be noted that; the above is only a kind of preferred implementation of the present invention, for those skilled in the art, under the premise without departing from the principles of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (9)
1. a frequency conversion equipment supplied by AC/DC electricity system, is characterized in that: be provided with DC power supply binding post, ac power supply terminal, direct current sample circuit, controller and the first inversion unit for DC bus-bar voltage being reverse into Alternating Current Power Supply needed for AC load; Described ac power supply terminal sub-connection first rectifier bridge, by the first rectifier bridge, the AC power of access is rectified into DC power supply, also booster circuit is connected with between described first rectifier bridge and the first inversion unit, described booster circuit receives the pulse signal that controller exports, and the DC power supply that the first rectifier bridge rectification exports is carried out to DC boosting conversion and carried out phasing to alternating voltage, electric current; Described booster circuit is by the DC bus-bar voltage input of the first extremely described for the transmitting DC after boosting inversion unit; Described DC power supply binding post connects the second inversion unit, the DC power supply of access being reverse into AC power by the second inversion unit transfers to after isolating transformer carries out the isolated variable of voltage, exports the second rectifier bridge to be rectified into the DC bus-bar voltage input that DC power supply exports described first inversion unit to; Described direct current sample circuit gathers the direct voltage by described DC power supply binding post input, and after being isolated by DC-isolation converter, exports described controller to;
According to the sampled voltage that DC-isolation converter exports, described controller judges that whether the DC power supply accessed by DC power supply binding post is normal, and when detecting abnormal, first booster circuit startup optimization is controlled, the conducting duty ratio exporting the pulse signal of booster circuit to is increased to required conducting duty ratio gradually from 0, and during this period in, the conducting duty ratio exporting the pulse signal of the second inversion unit to is reduced gradually, until be 0, thus it is out of service to control the second inversion unit, powering mode is switched seamlessly to Alternating Current Power Supply pattern by direct current supply pattern.
2. frequency conversion equipment supplied by AC/DC electricity system according to claim 1, is characterized in that: the voltage magnitude of the DC power supply exported by described second rectifier bridge rectification is higher than the voltage peak by the sub AC power accessed of ac power supply terminal.
3. frequency conversion equipment supplied by AC/DC electricity system according to claim 1 and 2, it is characterized in that: in described system cloud gray model is during Alternating Current Power Supply pattern, if controller detects that the DC power supply accessed by DC power supply binding post recovers normal, then first control the second inversion unit to put into operation, the conducting duty ratio exporting the pulse signal of the second inversion unit to is increased to required conducting duty ratio gradually from 0, and during this period in, the conducting duty ratio exporting the pulse signal of booster circuit to is reduced gradually, until be 0, thus it is out of service to control booster circuit, powering mode is switched seamlessly to direct current supply pattern by Alternating Current Power Supply pattern.
4. a transducer air conditioning, is characterized in that: be provided with frequency conversion equipment supplied by AC/DC electricity system; DC power supply binding post, ac power supply terminal, direct current sample circuit, controller and the first inversion unit for DC bus-bar voltage being reverse into Alternating Current Power Supply needed for AC load is provided with in described frequency conversion equipment supplied by AC/DC electricity system; Described ac power supply terminal sub-connection first rectifier bridge, is rectified into the DC bus-bar voltage input of transmitting DC to the first inversion unit by the AC power of access by the first rectifier bridge; Described DC power supply binding post connects the second inversion unit, the DC power supply of access being reverse into AC power by the second inversion unit transfers to after isolating transformer carries out the isolated variable of voltage, exports the second rectifier bridge to be rectified into the DC bus-bar voltage input that DC power supply exports described first inversion unit to; Described direct current sample circuit gathers the direct voltage by described DC power supply binding post input, and after being isolated by DC-isolation converter, export described controller to, between AC and DC two kinds of powering modes, carry out switching controls by controller;
Described AC load is the compressor in air conditioner; When air conditioner operates in Alternating Current Power Supply pattern, and design temperature is when differing more than 5 DEG C with ambient temperature and need compressor high frequency to run, if the direct voltage exported by the first rectifier bridge rectification is lower than the DC bus-bar voltage met required for compressor operating frequency, then keep existing DC bus-bar voltage constant, control compressor weak magnetic speed-up, the high frequency needed for realization runs.
5. transducer air conditioning according to claim 4, is characterized in that: the voltage magnitude of the DC power supply exported by described second rectifier bridge rectification is higher than the voltage peak by the sub AC power accessed of ac power supply terminal.
6. transducer air conditioning according to claim 5, it is characterized in that: according to the sampled voltage of DC-isolation converter isolation and amplifier, described controller judges that whether the DC power supply accessed by DC power supply binding post is normal, and when detecting abnormal, control the second inversion unit out of service, turn by the ac power supply of outside.
7. transducer air conditioning according to claim 6, is characterized in that: in described supplied by AC/DC electricity system, be also provided with alternating current sampling circuit, gathers the magnitude of voltage of the AC power by the access of ac power supply terminal, and transfers to described controller; Described controller, when detecting that the DC power supply of access and AC power are all abnormal, controls the first inversion unit and the second inversion unit is out of service, cuts off the power supply to AC load.
8. a transducer air conditioning, is characterized in that: be provided with the frequency conversion equipment supplied by AC/DC electricity system any one of claims 1 to 3 as described in claim; Described AC load is the compressor in air conditioner.
9. transducer air conditioning according to claim 8, it is characterized in that: in during described transducer air conditioning operates in direct current supply pattern, when controller detects that the voltage magnitude of the DC power supply accessed by DC power supply binding post drops to early warning line, now, if design temperature differs more than 5 DEG C with ambient temperature, then controller switches seamlessly to Alternating Current Power Supply pattern immediately; If design temperature differs with ambient temperature within 5 DEG C, then first control compressor low-frequency operation, and detect the fluctuation situation of the DC power supply accessed by DC power supply binding post in real time, if the voltage magnitude of the DC power supply of access continues to decline, lower than the lower limit of setting, then controller switches seamlessly to Alternating Current Power Supply pattern immediately.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310634848.5A CN103701309B (en) | 2013-12-03 | 2013-12-03 | Frequency conversion equipment supplied by AC/DC electricity system and transducer air conditioning |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310634848.5A CN103701309B (en) | 2013-12-03 | 2013-12-03 | Frequency conversion equipment supplied by AC/DC electricity system and transducer air conditioning |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103701309A CN103701309A (en) | 2014-04-02 |
| CN103701309B true CN103701309B (en) | 2016-03-09 |
Family
ID=50362745
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310634848.5A Expired - Fee Related CN103701309B (en) | 2013-12-03 | 2013-12-03 | Frequency conversion equipment supplied by AC/DC electricity system and transducer air conditioning |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103701309B (en) |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6765174B2 (en) * | 2015-09-18 | 2020-10-07 | シャープ株式会社 | Air conditioner and control method of air conditioner |
| CN105510680B (en) * | 2016-01-27 | 2019-01-11 | 中车株洲电力机车有限公司 | A kind of alternating current-direct current network pressure detection device |
| CN105629190B (en) * | 2016-01-27 | 2019-01-15 | 中车株洲电力机车有限公司 | A kind of alternating current-direct current network pressure detection circuit |
| CN107395090A (en) * | 2017-06-22 | 2017-11-24 | 东南大学 | A kind of high-power High Power Factor drive control device for single-phase linear Stirling motor |
| CN107959458A (en) * | 2017-12-06 | 2018-04-24 | 海信（山东）空调有限公司 | Dc bus low capacity capacitance frequency conversion control circuit and frequency conversion equipment |
| CN108233719A (en) * | 2018-02-01 | 2018-06-29 | 湖南意谱电动系统有限公司 | A kind of llc circuits that can adapt to wide output voltage range and control method |
| CN110203040B (en) * | 2019-07-01 | 2024-01-12 | 合肥天鹅制冷科技有限公司 | Control system of double-system air conditioner |
| CN112398329B (en) * | 2019-08-14 | 2021-08-31 | 台达电子工业股份有限公司 | Bidirectional power factor correction module |
| CN110707990A (en) * | 2019-10-16 | 2020-01-17 | 合肥学院 | AC/DC motor control system |
| CN111720947B (en) * | 2020-06-19 | 2022-03-08 | 海信（山东）空调有限公司 | Method for controlling bus voltage of air conditioner, air conditioner and storage medium |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1503444A (en) * | 2002-11-22 | 2004-06-09 | 株洲电力机车研究所 | DC boosting conversion circuit |
| CN101404410A (en) * | 2008-10-27 | 2009-04-08 | 张强胜 | Green energy resource and network-electricity parallel operation method |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2990309B1 (en) * | 2012-05-04 | 2015-05-15 | Alstom Technology Ltd | DEVICE FOR NON-LINEAR CONTROL OF DC / DC CONVERTER FOR APPLICATION TO HVDC CURRENT TRANSPORT. |
-
2013
- 2013-12-03 CN CN201310634848.5A patent/CN103701309B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1503444A (en) * | 2002-11-22 | 2004-06-09 | 株洲电力机车研究所 | DC boosting conversion circuit |
| CN101404410A (en) * | 2008-10-27 | 2009-04-08 | 张强胜 | Green energy resource and network-electricity parallel operation method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103701309A (en) | 2014-04-02 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103701309B (en) | Frequency conversion equipment supplied by AC/DC electricity system and transducer air conditioning | |
| CN102545257B (en) | Solar photovoltaic generating single-phase grid-connected inverter and control method thereof | |
| CN104124748B (en) | Bus station's intelligent power supply power-supply system that a kind of clean energy resource compensates | |
| CN101951011B (en) | Solar photovoltaic and commercial power combined power supply system and control method thereof | |
| Liu et al. | Cascade dual-boost/buck active-front-end converter for intelligent universal transformer | |
| CN201726182U (en) | High voltage ultracapacitor power battery charger | |
| CN203645345U (en) | Solar air-conditioning system | |
| CN104734178A (en) | Solar air-conditioning system and control method thereof | |
| TWI387176B (en) | Intelligent hybrid power conversion control system | |
| CN201805362U (en) | Step current limiting circuit used for aviation AC/DC conversion | |
| CN102790422B (en) | A kind of UPS charging module device and control method thereof | |
| CN103138291A (en) | Wind power generation intelligent single-phase grid-connection controller | |
| CN204886384U (en) | Integrative terminal of domestic photovoltaic power generation energy storage of miniwatt | |
| Ahmed et al. | Power flow control Methods for an ultracapacitor bidirectional converter in DC microgrids—A comparative study | |
| CN102315680A (en) | High-voltage and super-capacitance power battery charger | |
| CN107086600A (en) | A kind of solar energy power generating three phase full bridge grid-connected inverting system | |
| CN204103796U (en) | Photovoltaic DC-to-AC converter and PV air-conditioner system | |
| CN101847876A (en) | Three-phase photovoltaic grid connected inverter system | |
| CN108683247A (en) | A kind of uninterruptible power system and method for hybrid fuel cell and ultracapacitor | |
| CN104006479A (en) | Photovoltaic air conditioning system and control method thereof | |
| CN102437752A (en) | Grading limiting circuit for aerospace alternative-current/direct-current (AC/DC) converter | |
| CN207251220U (en) | A kind of solar energy power generating three phase full bridge grid-connected inverting system | |
| CN102931678B (en) | Double-staggered flyback photovoltaic grid-connected micro inverter and control method thereof | |
| CN104701836A (en) | Intelligent direct-current micro-grid power supply system | |
| CN104124884A (en) | Photovoltaic inverter and photovoltaic air conditioner system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160309 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |