CN105897021A - Inverter - Google Patents
Inverter Download PDFInfo
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- CN105897021A CN105897021A CN201610345034.3A CN201610345034A CN105897021A CN 105897021 A CN105897021 A CN 105897021A CN 201610345034 A CN201610345034 A CN 201610345034A CN 105897021 A CN105897021 A CN 105897021A
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- Prior art keywords
- capacitor
- current
- circuit
- relay
- inverter
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/36—Means for starting or stopping converters
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
Abstract
The invention provides an inverter, which comprises a pre-charging circuit, a first capacitor, a first relay and a power conversion circuit, wherein the pre-charging circuit is connected with a DC input power supply and the first capacitor, receives a pre-charging current transmitted by the DC input power supply and transmits the pre-charging current to the first capacitor; the DC input power supply is connected with the first capacitor through the first relay; when a pre-charging voltage of the first capacitor is greater than or equal to a preset voltage value, the first relay is closed, the DC input power supply is directly communicated with the first capacitor, a DC is transmitted to the first capacitor and connection with the pre-charging circuit is cut off; the first capacitor is connected with the power conversion circuit and transmits the received DC to the power conversion circuit; and the power conversion circuit converts the received DC into an AC and outputs the AC. By the inverter, the problem that the service lifetime of the capacitor and the overall circuit is shortened due to an over-high charging current of the DC input power supply at the power-on moment and great impacts on the capacitor and the overall circuit is solved.
Description
Technical field
The present invention relates to electric and electronic technical field, in particular to a kind of inverter.
Background technology
Inverter is a kind of device that DC conversion becomes alternating current, is usually by inverter circuit, control
Circuit processed and filter circuit composition, the direct-flow input end of inverter is connected with inverter circuit by capacitor.
In prior art, capacitor is connected with the direct-flow input end of inverter, defeated at the direct current of inverter
Enter before end is switched on, capacitor does not has electricity store, at the bus bar quilt of direct-flow input end
The moment connected, capacitor is comparable to short circuit, and the charging current flowing through capacitor is very big, and works as
When the capacity of capacitor is bigger, this charging current persistent period is the longest, produces capacitor and whole circuit
Raw huge impact, reduces capacitor and the service life of whole circuit.
Summary of the invention
In view of this, the purpose of the embodiment of the present invention is to provide a kind of inverter, to solve existing skill
The moment that inverter in art is switched at the bus bar of direct-flow input end, capacitor is equivalent to short circuit,
The charging current flowing through capacitor is very big, and capacitor and whole circuit are produced huge impact, thus
The problem reducing the service life of capacitor and whole circuit.
First aspect, embodiments provides a kind of inverter, and wherein, described inverter includes:
Precharging circuit, the first capacitor, the first relay and power conversion circuit；
Described precharging circuit is connected with direct-current input power supplying and described first capacitor, receives described direct current
The preliminary filling electric current of input power transmission, and transmit described preliminary filling electric current to described first capacitor；
Described direct-current input power supplying is connected with described first capacitor by described first relay, works as institute
When stating the pre-charge pressure of the first capacitor more than or equal to preset voltage value, close described first relay,
Described direct-current input power supplying directly turns on described first capacitor, and transmission direct current supplies electricity to described first electricity
Container, and disconnect the connection between described precharging circuit；
Described first capacitor is connected with described power conversion circuit, receives described direct-current input power supplying and passes
Defeated unidirectional current, and transmit described direct current and supply electricity to described power conversion circuit, by described power conversion electricity
Road is by described converting direct-current power into alternating-current power, and exports described alternating current.
In conjunction with first aspect, embodiments provide the first possible reality of above-mentioned first aspect
Existing mode, wherein, described precharging circuit includes the secondth relay and current-limiting circuit；
Described second relay is connected with described direct-current input power supplying and described current-limiting circuit respectively, receives
The preliminary filling electric current of described direct-current input power supplying transmission, and transmit described preliminary filling electric current to described current limliting electricity
Road；
Described current-limiting circuit is connected with described first capacitor, receives the pre-of described second relay transmission
Charging stream, and transmit described preliminary filling electric current to described first capacitor.
In conjunction with the first possible implementation of first aspect, embodiments provide above-mentioned
The implementation that the second on the one hand is possible, wherein, described current-limiting circuit includes: unidirectional energising
Road, audion and biasing resistor；
Described one-way conduction circuit is connected with described second relay and described audion, receives described
The preliminary filling electric current of two relay transmission, and transmit described preliminary filling electric current to described audion；
Described audion is connected with described first capacitor and described biasing resistor, described biasing resistor with
Described first capacitor connects.
In conjunction with the implementation that the second of first aspect is possible, embodiments provide above-mentioned
The third possible implementation on the one hand, wherein, described one-way conduction circuit includes:
Diode, pull-up resistor and Metal-Oxide Semiconductor field effect transistor M OSFET；
Described diode is connected with described second relay, described MOSFET and described pull-up resistor；
Described pull-up resistor is connected with described MOSFET, described MOSFET and described audion and described
Biasing resistor connects.
In conjunction with the implementation that the second of first aspect is possible, embodiments provide above-mentioned
The 4th kind of possible implementation on the one hand, wherein, described current-limiting circuit also includes electric fuse；
Described electric fuse is connected with described audion, described biasing resistor and described first capacitor.
In conjunction with the implementation that the second of first aspect is possible, embodiments provide above-mentioned
The 5th kind of possible implementation on the one hand, wherein, described inverter also includes voltage detecting circuit
And Control chip；
Described voltage detecting circuit is connected with described first capacitor and described Control chip, real
Time detect the pre-charge pressure of described first capacitor, and transmit described pre-charge pressure to described relay control
Coremaking sheet；
Described Control chip is connected with described first relay and described second relay, receives
The pre-charge pressure of described voltage detecting circuit transmission, enters described pre-charge pressure with described preset voltage value
Row compares, and when described pre-charge pressure is more than or equal to described preset voltage value, controls described first relay
Device closes and controls described second relay and disconnects.
In conjunction with the 5th kind of possible implementation of first aspect, embodiments provide above-mentioned
The 6th kind of possible implementation on the one hand, wherein, described Control chip is additionally operable in institute
When stating inverter unlatching, control described second relay Guan Bi and control described first relay disconnection.
In conjunction with the 5th kind of possible implementation of first aspect, embodiments provide above-mentioned
The 7th kind of possible implementation on the one hand, wherein, described current-limiting circuit also includes photo-coupler；
Described photo-coupler is connected with described one-way conduction circuit and described Control chip respectively,
Receive the preliminary filling electric current of described one-way conduction circuit transmission, change described precharge circulation into the signal of telecommunication,
And transmit the described signal of telecommunication to described Control chip.
In conjunction with the 7th kind of possible implementation of first aspect, embodiments provide above-mentioned
The 8th kind of possible implementation on the one hand, wherein, described current-limiting circuit also includes the second capacitor；
Described second capacitor is connected with described photo-coupler and described Control chip, receives institute
State the signal of telecommunication of photo-coupler transmission, and transmit the described signal of telecommunication to described Control chip.
In conjunction with first aspect, embodiments provide the 9th kind of possible reality of above-mentioned first aspect
Existing mode, wherein, described power conversion circuit includes inverter bridge and controller；
Described inverter bridge is connected with described first capacitor and described controller respectively, receives described first
The unidirectional current of capacitor transmission, and receive the control instruction of described controller transmission, according to described control
Instruction is by described converting direct-current power into alternating-current power, and exports described alternating current.
The inverter that the embodiment of the present invention provides, including precharging circuit, the first capacitor, the first relay
Device and power conversion circuit, precharging circuit carries out preliminary filling to the first capacitor, pre-when the first capacitor
When charging voltage is more than or equal to preset voltage value, the first capacitor directly turns on direct-current input power supplying, this
Sample, it is to avoid owing to direct-current input power supplying is in the moment connected, charging current is excessive, to capacitor and
The impact that the generation of whole circuit is huge, and the problem reducing the service life of capacitor and whole circuit.
For making the above-mentioned purpose of the present invention, feature and advantage to become apparent, preferable reality cited below particularly
Execute example, and coordinate appended accompanying drawing, be described in detail below.
Accompanying drawing explanation
In order to be illustrated more clearly that the technical scheme of the embodiment of the present invention, below will be to required in embodiment
Accompanying drawing to be used is briefly described, it will be appreciated that the following drawings illustrate only some of the present invention
Embodiment, is therefore not construed as the restriction to scope, for those of ordinary skill in the art,
On the premise of not paying creative work, it is also possible to obtain other relevant accompanying drawings according to these accompanying drawings.
Fig. 1 shows the structural representation of a kind of inverter that the embodiment of the present invention provided；
Fig. 2 shows the structural representation of precharging circuit in a kind of inverter that the embodiment of the present invention is provided
Figure；
Fig. 3 shows the circuit diagram of precharging circuit in a kind of inverter that the embodiment of the present invention provides.
Fig. 3 description of reference numerals is as follows:
V, direct-current input power supplying；R1, pull-up resistor；R2, biasing resistor；D1, diode；111,
Second relay；130, the first relay；Q1, audion；Q2, MOSFET；U2, electric fuse；
120, the first capacitor；U1, photo-coupler；C, the second capacitor；R3, R4, resistance.
Detailed description of the invention
For making the purpose of the embodiment of the present invention, technical scheme and advantage clearer, below in conjunction with this
Accompanying drawing in inventive embodiments, is clearly and completely described the technical scheme in the embodiment of the present invention,
Obviously, described embodiment is only a part of embodiment of the present invention rather than whole embodiments.
Generally herein described in accompanying drawing and the assembly of the embodiment of the present invention that illustrates can be with various different joining
Put and arrange and design.Therefore, retouching in detail the embodiments of the invention provided in the accompanying drawings below
State the scope being not intended to limit claimed invention, but be merely representative of the selected reality of the present invention
Execute example.Based on embodiments of the invention, those skilled in the art are not before making creative work
Put the every other embodiment obtained, broadly fall into the scope of protection of the invention.
In view of inverter of the prior art, it is made up of inverter circuit, control circuit and filter circuit,
The direct-flow input end of inverter is connected with inverter circuit by capacitor, and i.e. capacitor and inverter is straight
Stream input connects, and before the direct-flow input end of inverter is switched on, is not have electricity in capacitor
Storing, the moment that the bus bar at direct-flow input end is switched on, capacitor is comparable to short circuit,
The charging current flowing through capacitor is very big, and when the capacity of capacitor is bigger, this charging current continues
Time is the longest, and capacitor and whole circuit produce huge impact, thus reduces capacitor and whole
The service life of circuit.Based on this, embodiments provide a kind of inverter, below by reality
Execute example to be described.
Embodiment
Embodiments provide a kind of inverter, turn on it at capacitor and direct-current input power supplying
Before, first pass through precharging circuit and capacitor is carried out current limliting preliminary filling, when pre-charge pressure and the direct current of capacitor
The magnitude of voltage of input power close to or equal time, capacitor and direct-current input power supplying are turned on, so,
Avoiding owing to direct-current input power supplying is in the moment connected, charging current is excessive, and to capacitor and whole
The impact that the generation of individual circuit is huge, thus the problem reducing the service life of capacitor and whole circuit.
As it is shown in figure 1, the inverter that the embodiment of the present invention provides, including: precharging circuit 110, first
Capacitor the 120, first relay 130 and power conversion circuit 140；
Precharging circuit 110 is connected with direct-current input power supplying and the first capacitor 120, receives direct current input
The preliminary filling electric current of power delivery, and transmit this preliminary filling electric current to the first capacitor 120；
Direct-current input power supplying is connected with the first capacitor 120 by the first relay 130, when the first electricity
When the pre-charge pressure of container 120 is more than or equal to preset voltage value, closing the first relay 130, direct current is defeated
Entering power supply and the first capacitor 120 directly turns on, transmission direct current supplies electricity to the first capacitor 120, and disconnects
And the connection between precharging circuit 110；
First capacitor 120 is connected with power conversion circuit 140, receives direct-current input power supplying transmission
Unidirectional current, and transmit this direct current and supply electricity to power conversion circuit 140, by power conversion circuit 140 by direct current
Electricity is converted into alternating current, and exports this alternating current.
Above-mentioned preset voltage value is equal with the magnitude of voltage of direct-current input power supplying or is close.
Above-mentioned precharging circuit 110 receives the unidirectional current of direct-current input power supplying transmission, and enters this unidirectional current
Row current limliting, obtains a less preliminary filling electric current of current value, and this preliminary filling electric current is for the first capacitor
120 carry out preliminary filling, so the first capacitor 120 will not be produced huge impact.
Above-mentioned first relay 130 is for controlling between the first capacitor 120 and direct-current input power supplying
Directly being turned on or off, when the first relay 130 disconnects, the first capacitor 120 inputs with direct current
Power supply separated, when the first relay 130 closes, the first capacitor 120 and direct current input electricity
Directly turn between source.
In the unidirectional current conversion that direct-current input power supplying is inputted by the inverter using the embodiment of the present invention to provide
When becoming alternating current, first precharging circuit 110 is connected with direct-current input power supplying so that precharging circuit 110
Receive the unidirectional current of direct-current input power supplying transmission, owing to this galvanic electric current is relatively big, be therefore pre-charged
Road 110 also can carry out current limliting to this unidirectional current, obtains the preliminary filling electric current that electric current is smaller, and should be with
Charging is streaming to the first capacitor 120, and the first capacitor 120 is carried out preliminary filling, due to above-mentioned preliminary filling
Electric current is smaller, thus without make first capacitor 120 short circuit, and will not to the first capacitor 120,
Cause huge impact, when the pre-charge pressure of the first capacitor 120 is more than or equal to preset voltage value
Time, close the first relay 130, at this moment, direct-current input power supplying and the first capacitor 120 directly turn on,
Transmission direct current supplies electricity to the first capacitor 120, and at this moment, precharging circuit 110 is in short-circuit condition, disconnects straight
Connection between stream input power and precharging circuit 110.When the first capacitor 120 will receive direct current
During the unidirectional current of input power transmission, by the DC power transmission that receives to power conversion circuit 140, merit
Rate translation circuit 140 is by this converting direct-current power into alternating-current power, and is given by this alternating current transmission and power change
Change the load that circuit 140 connects, powering load.
The inverter that the embodiment of the present invention provides, including precharging circuit the 110, first capacitor 120, the
One relay 130 and power conversion circuit 140, the first capacitor 120 is carried out pre-by precharging circuit 110
Fill, when the pre-charge pressure of the first capacitor 120 is more than or equal to preset voltage value, the first capacitor 120
Directly turn on direct-current input power supplying, so, it is to avoid owing to direct-current input power supplying is in the moment connected,
Charging current is excessive, and capacitor and whole circuit produce huge impact, and reduces capacitor and whole
The problem in the service life of individual circuit.
Wherein, as an embodiment, as in figure 2 it is shown, above-mentioned precharging circuit 110 includes that second continues
Electrical equipment 111 and current-limiting circuit 112；
Second relay 111 is connected with direct-current input power supplying and current-limiting circuit 112 respectively, receives direct current
The preliminary filling electric current of input power transmission, and transmit this preliminary filling electric current to current-limiting circuit 112；
Current-limiting circuit 112 is connected with the first capacitor 120, receives the pre-of the second relay 111 transmission
Charging stream, and transmit this preliminary filling electric current to the first capacitor 120.
Above-mentioned second relay 111 is for controlling the company between direct-current input power supplying and current-limiting circuit 112
Connect or disconnect, when the second relay 111 disconnects, between direct-current input power supplying and current-limiting circuit 112
Being off, when the second relay 111 closes, direct-current input power supplying is connected with current-limiting circuit 112.
In the unidirectional current conversion that direct-current input power supplying is transmitted by the inverter using the embodiment of the present invention to provide
When becoming alternating current, first closing the second relay 111, direct-current input power supplying connects with current-limiting circuit 112,
Make current-limiting circuit 112 receive the unidirectional current of direct-current input power supplying transmission, and this unidirectional current is limited
System, obtains the preliminary filling electric current that electric current is smaller, and this precharge is streaming to the first capacitor 120,
First capacitor 120 is carried out preliminary filling, when the pre-charge pressure of the first capacitor 120 is more than or equal to
During precharging voltage value, close the first relay 130, at this moment, direct-current input power supplying and the first capacitor
120 directly turn on, and transmission direct current supplies electricity to the first capacitor 120, at this moment the second relay 111 and circuit
Electric current 112 is in short-circuit condition, disconnects the second relay 111, i.e. disconnects current-limiting circuit 112 and direct current
Connection between input power, when the first capacitor 120 receives the direct current of direct-current input power supplying transmission
Electricity time, the first capacitor 120 by this DC power transmission to power conversion circuit 140, power conversion circuit
140 converting direct-current power into alternating-current powers that will receive, and export this alternating current.
In order to control being opened or closed of above-mentioned first relay 130 and the second relay 111,
The inverter that the embodiment of the present invention provides also includes voltage detecting circuit and Control chip；
Voltage detecting circuit and the first capacitor 120 and Control chip connect, and detect the in real time
The pre-charge pressure of one capacitor 120, and transmit this pre-charge pressure to Control chip；
Control chip connects with the first relay 130 and the second relay 111, receives voltage
The pre-charge pressure of testing circuit transmission, compares this pre-charge pressure with preset voltage value, works as preliminary filling
When voltage is more than or equal to preset voltage value, controls the first relay 130 and close and control the second relay
111 disconnect.
Above-mentioned preset voltage value is the magnitude of voltage pre-set in Control chip, and this is preset
Magnitude of voltage is equal with the magnitude of voltage of direct-current input power supplying or is close.
Above-mentioned Control chip can be single-chip microcomputer, and Control chip can be by height electricity
Ordinary mail number controls being opened or closed of the first relay 130 and the second relay 111.Such as, when
When Control chip transmission high level signal gives the first relay 130, the first relay 130 closes
Close, when Control chip transmission low level signal gives the first relay 130, the first relay
130 disconnect；Or, it is also possible to it is when Control chip transmission high level is to the first relay 130
Time, the first relay 130 disconnects, when Control chip transmission low level signal gives the first relay
During device 130, the first relay 130 closes.
Voltage detecting circuit and the first capacitor 120 connect, can real-time or periodic detection the first electric capacity
Device 120 both end voltage value, the size of this magnitude of voltage is exactly the big of the pre-charge pressure of the first capacitor 120
Little, therefore, the magnitude of voltage detecting the first capacitor 120 two ends is exactly at detection the first capacitor 120
Pre-charge pressure, and the pre-charge pressure at the first capacitor 120 two ends detected is transferred to relay
Control chip, the preset voltage value of the pre-charge pressure received with storage is carried out by Control chip
Relatively, when the pre-charge pressure received is more than or equal to preset voltage value, Control chip
Can generate relay control signal, this relay control signal can be low and high level signal, to control
First relay 130 closes and the second relay 111 disconnects, at this moment, and direct-current input power supplying and first
Capacitor 120 directly turns on.
Above-mentioned Control chip is additionally operable to when inverter is opened, and controls the second relay 111 and closes
Close and control the first relay 130 and disconnect so that direct-current input power supplying connects with current-limiting circuit 112,
First capacitor 120 is carried out preliminary filling.
Above-mentioned current-limiting circuit 112 receives the unidirectional current of direct-current input power supplying transmission, and enters this unidirectional current
Row limits, and obtains preliminary filling electric current, and this precharge is streaming to the first capacitor 120, to the first electricity
Container 120 carries out preliminary filling, and the unidirectional current received is limited by current-limiting circuit 112, prevents from flowing to
The precharge of the first capacitor 120 is flow through greatly, and the first capacitor 120 is caused the biggest impact, because of
The current-limiting circuit 112 that this embodiment of the present invention provides includes one-way conduction circuit, audion and biased electrical
Resistance；
One-way conduction circuit and the second relay 111 and audion connect, and receive the second relay 111
The preliminary filling electric current of transmission, and transmit this preliminary filling electric current to audion；
Audion and the first capacitor 120 and biasing resistor connect, biasing resistor and the first capacitor 120
Connect.
Above-mentioned one-way conduction circuit makes the electric current of direct-current input power supplying received can only be towards the first electric capacity
The direction flowing of device 120, and make what the electric current of biasing resistor can continue to be transferred to the first capacitor
120。
One end of above-mentioned biasing resistor is connected with the base stage of audion, the other end and the emitter stage of audion
And first capacitor 120 connect, the base stage of above-mentioned audion is connected with one-way conduction circuit, audion
Emitter stage and the first capacitor 120 connect.
Wherein, as an embodiment, above-mentioned one-way conduction circuit include diode, pull-up resistor and
MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor, metal-
Oxide semiconductor field effect transistor)；
Diode and the second relay 111, MOSFET and pull-up resistor connect；
Pull-up resistor is connected with MOSFET, and MOSFET is connected with audion and biasing resistor.
Anode and second relay 111 of above-mentioned diode connect, the negative electrode of diode and pull-up resistor
And MOSFET connects, owing to diode is one way conducting device, therefore, above-mentioned diode can only receive
The unidirectional current of the second relay 111 transmission, and by this DC power transmission to pull-up resistor and MOSFET,
Make electric current towards the direction one-way flow of the first capacitor 120.
The drain electrode of above-mentioned MOSFET is connected with the negative electrode of diode and one end of pull-up resistor respectively,
The grid of MOSFET is connected with the other end of pull-up resistor, the source electrode of MOSFET and the base stage of diode and
Biasing resistor connects.
Above-mentioned pull-up resistor can be a resistance, it is also possible to be multiple resistant series composition, pull-up electricity
Number and the resistance of resistance can be configured according to concrete application scenarios, and the embodiment of the present invention does not limit
The concrete number of above-mentioned pull-up resistor and resistance.
Above-mentioned pull-up resistor makes MOSFET be constantly in conducting state, and flows through the electric current of biasing resistor
Sustainable supply the first capacitor 120.
In order to prevent the precharge being transferred to the first capacitor 120 from flowing through greatly so that the first capacitor 120
By the biggest impulse force, thus reduce the service life of the first capacitor 120, above-mentioned current-limiting circuit 112
Also include electric fuse；
Electric fuse is connected with audion, biasing resistor and the first capacitor 120.
One end of above-mentioned electric fuse connects with emitter stage and the biasing resistor of audion, the other end and first
Capacitor 120 connects.
When the preliminary filling electric current flowing through above-mentioned electric fuse is more than or equal to pre-set current value, electric fuse is just
Can fuse, at this moment, the connection between the first capacitor 120 and the emitter stage of audion and biasing resistor
Disconnecting, the first capacitor 120 cannot receive emitter stage and the preliminary filling of biasing resistor transmission of audion
Electric current.
Above-mentioned pre-set current value is the blowout current of electric fuse, when the preliminary filling electric current flowing through electric fuse is more than
Or during equal to this pre-set current value, electric fuse will fuse.
In embodiments of the present invention, flow through the preliminary filling electric current of electric fuse be flow through audion emitter stage and
The electric current sum of biasing resistor, therefore, the blowout current of above-mentioned electric fuse can be according to flowing through audion
Emitter stage and the electric current sum of biasing resistor determine.
In order to the feedback of status charged by the first capacitor 120 is to Control chip,
Above-mentioned current-limiting circuit 112 also includes photo-coupler；
Photo-coupler is connected with one-way conduction circuit and Control chip respectively, receives one-way conduction
The preliminary filling electric current of circuit transmission, changes this precharge circulation the signal of telecommunication into, and transmits this signal of telecommunication to continuing
Electrical equipment control chip.
When, after above-mentioned second relay 111 Guan Bi, one end of above-mentioned one-way conduction circuit inputs with direct current
Power on, receives the unidirectional current of direct-current input power supplying transmission, and the input of photo-coupler is with unidirectional
The other end of circuit passband connects, and receives the preliminary filling electric current of one-way conduction circuit transmission, and by this precharge
Circulation changes the signal of telecommunication into, this signal of telecommunication is fed back to Control chip, when one-way conduction circuit has
When electric current passes through, just having the signal of telecommunication and generate, therefore Control chip is by just receiving the signal of telecommunication
It is appreciated that whether above-mentioned first capacitor 120 is in charged state.
The signal of telecommunication of above-mentioned photo-coupler output can be shaken, for the electricity preventing photo-coupler from exporting
Signal is shaken, and above-mentioned current-limiting circuit 112 also includes the second capacitor；
Second capacitor is connected with photo-coupler and Control chip, receives photo-coupler transmission
The signal of telecommunication, and transmit this signal of telecommunication to Control chip.
In order to describe in above-mentioned precharging circuit 110 annexation between each components and parts in detail, under
Above-mentioned precharging circuit will be described in detail by face in conjunction with Fig. 3, and Fig. 3 shows that the embodiment of the present invention carries
The circuit diagram of precharging circuit 110 in the inverter of confession.
Fig. 3 is introduced as a example by a pull-up resistor R1, does not limit concrete of pull-up resistor
Number, the concrete number of pull-up resistor can be configured according to concrete application.
In Fig. 3, one end of the first relay 130 is connected with direct-current input power supplying V, the other end and
Two capacitors 120 connect.One end of second relay 111 is connected with direct-current input power supplying V, another
End is connected with the anode of diode D1, the negative electrode of diode D1 and one end of pull-up resistor R1 and MOSFET
The drain electrode of Q2 connects, and the also drain electrode with MOSFET Q2 of one end of pull-up resistor R1 is connected, pull-up resistor
The other end of R1 is connected with the grid of MOSFET Q2, the source electrode of MOSFET Q2 and the base of audion Q1
Pole and biasing resistor R2 connect, the emitter stage of audion Q1, biasing resistor all with the one of electric fuse U2
End connects, and the other end and second capacitor 120 of electric fuse U2 connect.The input of photo-coupler U1
End is connected with the grid of pull-up resistor R1, MOSFET Q2 and the colelctor electrode of audion Q1, photo-coupler
The input of U1 is a diode, and the anode of this diode is with pull-up resistor R1's and MOSFET Q2
Grid connects, and the negative electrode of this diode is connected with the colelctor electrode of audion Q1, and photo-coupler U1's is defeated
Going out end to be connected with the second capacitor C, the second capacitor C is connected with resistance R4, above-mentioned electric fuse U2
Also it is connected with resistance R3.
When the first capacitor 120 is carried out preliminary filling, close the second relay 111, such diode
The anode of D1 is connected with direct-current input power supplying V, and the unidirectional current of direct-current input power supplying V output flows through above-mentioned
Diode D1, is transferred to MOSFET Q2 by pull-up resistor R1, and pull-up resistor R1 also acts as limit
The effect of stream, makes the unidirectional current of inflow MOSFET Q2 reduce, and above-mentioned pull-up resistor R1 makes MOSFET
Q2 is constantly in the state of conducting, and therefore the DC power transmission of reduction can be given three by MOSFET Q2 continuously
Pole pipe Q1 and biasing resistor R2.
The electric current flowing through biasing resistor R2 can be calculated by audion Q1, the base stage of audion Q1 and
One PN (positive-negative) junction voltage of existence between emitter stage, and this PN junction voltage
Size is relevant with the model of audion Q1, the PN junction electricity of the audion Q1 used in the embodiment of the present invention
Pressure is 0.6V, and the resistance of the biasing resistor R2 chosen in the embodiment of the present invention is 330m Ω, therefore,
According to formulaCan calculate that to flow through the electric current of biasing resistor R2 be 1.81A, wherein,
In above-mentioned formula, I is the electric current flowing through biasing resistor R2, and U is the PN junction voltage of audion Q1, R
Resistance for biasing resistor R2.
The embodiment of the present invention is that audion Q1 with PN junction voltage as 0.6V and resistance are for 330m Ω's
Illustrate as a example by biasing resistor R2, do not limit PN junction voltage and the biasing resistor of audion Q1
The resistance size of R2, the size of the PN junction voltage of audion Q1 and the resistance of biasing resistor R2 can root
Choose according to concrete application scenarios.
Owing to above-mentioned first capacitor 120 is connected with emitter stage and the biasing resistor R2 of audion Q1,
Therefore, the electric current sum conduct of the electric current flowing through biasing resistor R2 and the emitter stage flowing through audion Q1
Preliminary filling electric current, is transferred to the first capacitor 120, one end of electric fuse U2 and biasing resistor R2 and three poles
The emitter stage of pipe Q1 connects, and the other end and first capacitor 120 of electric fuse U2 connect, in order to protect
The electric current of the emitter stage of card biasing resistor R2 and audion Q1 can flow through electric fuse U2, electric fuse U2
Blowout current should be equal to or slightly greater than flowing through the electric current of biasing resistor R2 and the transmitting of audion Q1
The electric current sum of pole, in embodiments of the present invention, the electric current of the emitter stage flowing through audion Q1 is the least
In flowing through the electric current of biasing resistor R2, therefore the blowout current of electric fuse U2 can be 2A.
When the pre-charge pressure of the first capacitor 120 is more than or equal to preset voltage value, close first
Relay 130, at this moment, direct-current input power supplying V and the first capacitor 120 directly turn on, and transmit direct current
Supply electricity to the first capacitor 120, at this moment, the second relay 111, diode D1, pull-up resistor, MOSFET
Q1, audion Q1, biasing resistor R2 and electric fuse U2 are short-circuit, and disconnect the second relay 111.
Wherein, as an embodiment, above-mentioned power conversion circuit 140 includes inverter bridge and controller；
Inverter bridge is connected with the first capacitor 120 and controller respectively, receives the first capacitor 120 and passes
Defeated unidirectional current, and receive the control instruction of controller transmission, according to control instruction, unidirectional current is changed
Become alternating current, and export this alternating current.
Controller noted above can be PWM (Pulse Width Modulation, pulse width modulation) control
Device processed.
In embodiments of the present invention, inverter bridge is connected with the first capacitor 120, receives the first capacitor
The unidirectional current of 120 transmission, this unidirectional current is converted into exchange by the technology of pulse width modulation by controller
Electricity, and this alternating current transmission is given the load being connected with inverter bridge, for loaded work piece.
The inverter that the embodiment of the present invention provides, including precharging circuit, the first capacitor, the first relay
Device and power conversion circuit, precharging circuit carries out preliminary filling to the first capacitor, pre-when the first capacitor
When charging voltage is more than or equal to preset voltage value, the first capacitor directly turns on direct-current input power supplying, this
Sample, it is to avoid owing to direct-current input power supplying is in the moment connected, charging current is excessive, to capacitor and
The impact that the generation of whole circuit is huge, and the problem reducing the service life of capacitor and whole circuit.
It should also be noted that similar label and letter represent similar terms, therefore, one in following accompanying drawing
A certain Xiang Yi the accompanying drawing of denier is defined, then need not it is carried out further in accompanying drawing subsequently
Definition and explanation.
In describing the invention, it should be noted that term " " center ", " on ", D score, " left ",
Orientation or the position relationship of the instruction such as " right ", " vertically ", " level ", " interior ", " outward " are based on attached
Orientation shown in figure or position relationship, or the orientation usually put or position when this invention product uses
Relation, is for only for ease of and describes the present invention and simplify description rather than instruction or the dress of hint indication
Put or element must have specific orientation, with specific azimuth configuration and operation, be not understood that
For limitation of the present invention.Additionally, term " first ", " second ", " the 3rd " etc. are only used for distinguishing
Describe, and it is not intended that indicate or hint relative importance.
In describing the invention, in addition it is also necessary to explanation, unless otherwise clearly defined and limited,
Term " is arranged ", " installation ", " being connected ", " connection " should be interpreted broadly, for example, it may be solid
Fixed connection, it is also possible to be to removably connect, or be integrally connected；Can be to be mechanically connected, it is also possible to
It it is electrical connection；Can be to be joined directly together, it is also possible to be indirectly connected to by intermediary, can be two
The connection of element internal.For the ordinary skill in the art, can be with in concrete condition understanding
State term concrete meaning in the present invention.
Last it is noted that the detailed description of the invention of embodiment described above, the only present invention, use
So that technical scheme to be described, being not intended to limit, protection scope of the present invention is not limited to
This, is although the present invention being described in detail with reference to previous embodiment, the ordinary skill of this area
Personnel are it is understood that any those familiar with the art is at the technical scope that the invention discloses
In, the technical scheme described in previous embodiment still can be modified by it maybe can readily occur in change
Change, or wherein portion of techniques feature is carried out equivalent；And these are revised, change or replace, and
The essence not making appropriate technical solution departs from the spirit and scope of embodiment of the present invention technical scheme.All answer
Contain within protection scope of the present invention.Therefore, protection scope of the present invention should be wanted with described right
The protection domain asked is as the criterion.
Claims (10)
1. an inverter, it is characterised in that including: precharging circuit, the first capacitor, first continue
Electrical equipment and power conversion circuit；
Described precharging circuit is connected with direct-current input power supplying and described first capacitor, receives described direct current
The preliminary filling electric current of input power transmission, and transmit described preliminary filling electric current to described first capacitor；
Described direct-current input power supplying is connected with described first capacitor by described first relay, works as institute
When stating the pre-charge pressure of the first capacitor more than or equal to preset voltage value, close described first relay,
Described direct-current input power supplying directly turns on described first capacitor, and transmission direct current supplies electricity to described first electricity
Container, and disconnect the connection between described precharging circuit；
Described first capacitor is connected with described power conversion circuit, receives described direct-current input power supplying and passes
Defeated unidirectional current, and transmit described direct current and supply electricity to described power conversion circuit, by described power conversion electricity
Road is by described converting direct-current power into alternating-current power, and exports described alternating current.
Inverter the most according to claim 1, it is characterised in that described precharging circuit includes
Second relay and current-limiting circuit；
Described second relay is connected with described direct-current input power supplying and described current-limiting circuit respectively, receives
The preliminary filling electric current of described direct-current input power supplying transmission, and transmit described preliminary filling electric current to described current limliting electricity
Road；
Described current-limiting circuit is connected with described first capacitor, receives the pre-of described second relay transmission
Charging stream, and transmit described preliminary filling electric current to described first capacitor.
Inverter the most according to claim 2, it is characterised in that described current-limiting circuit includes:
One-way conduction circuit, audion and biasing resistor；
Described one-way conduction circuit is connected with described second relay and described audion, receives described
The preliminary filling electric current of two relay transmission, and transmit described preliminary filling electric current to described audion；
Described audion is connected with described first capacitor and described biasing resistor, described biasing resistor with
Described first capacitor connects.
Inverter the most according to claim 3, it is characterised in that described one-way conduction circuit bag
Include:
Diode, pull-up resistor and Metal-Oxide Semiconductor field effect transistor M OSFET；
Described diode is connected with described second relay, described MOSFET and described pull-up resistor；
Described pull-up resistor is connected with described MOSFET, described MOSFET and described audion and described
Biasing resistor connects.
Inverter the most according to claim 3, it is characterised in that described current-limiting circuit also includes
Electric fuse；
Described electric fuse is connected with described audion, described biasing resistor and described first capacitor.
Inverter the most according to claim 3, it is characterised in that described inverter also includes electricity
Pressure testing circuit and Control chip；
Described voltage detecting circuit is connected with described first capacitor and described Control chip, real
Time detect the pre-charge pressure of described first capacitor, and transmit described pre-charge pressure to described relay control
Coremaking sheet；
Described Control chip is connected with described first relay and described second relay, receives
The pre-charge pressure of described voltage detecting circuit transmission, enters described pre-charge pressure with described preset voltage value
Row compares, and when described pre-charge pressure is more than or equal to described preset voltage value, controls described first relay
Device closes and controls described second relay and disconnects.
Inverter the most according to claim 6, it is characterised in that described Control chip
It is additionally operable to when described inverter is opened, controls described second relay Guan Bi and control described first and continue
Electrical equipment disconnects.
Inverter the most according to claim 6, it is characterised in that described current-limiting circuit also includes
Photo-coupler；
Described photo-coupler is connected with described one-way conduction circuit and described Control chip respectively,
Receive the preliminary filling electric current of described one-way conduction circuit transmission, change described precharge circulation into the signal of telecommunication,
And transmit the described signal of telecommunication to described Control chip.
Inverter the most according to claim 8, it is characterised in that described current-limiting circuit also includes
Second capacitor；
Described second capacitor is connected with described photo-coupler and described Control chip, receives institute
State the signal of telecommunication of photo-coupler transmission, and transmit the described signal of telecommunication to described Control chip.
Inverter the most according to claim 1, it is characterised in that described power conversion circuit
Including inverter bridge and controller；
Described inverter bridge is connected with described first capacitor and described controller respectively, receives described first
The unidirectional current of capacitor transmission, and receive the control instruction of described controller transmission, according to described control
Instruction is by described converting direct-current power into alternating-current power, and exports described alternating current.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610345034.3A CN105897021A (en) | 2016-05-23 | 2016-05-23 | Inverter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610345034.3A CN105897021A (en) | 2016-05-23 | 2016-05-23 | Inverter |
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| CN105897021A true CN105897021A (en) | 2016-08-24 |
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| CN102983607A (en) * | 2012-12-12 | 2013-03-20 | 奇瑞汽车股份有限公司 | Precharge device for motor controller of electromobile |
| CN104345269A (en) * | 2013-08-02 | 2015-02-11 | 株式会社捷太格特 | Power circuit abnormality detection method |
| CN104753328A (en) * | 2013-12-30 | 2015-07-01 | 上海五零盛同信息科技有限公司 | Current limiting high voltage start-up circuit of ultra wide input voltage switching power supply |
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