CN207926461U - A kind of AC-DC isolated variable circuits for soft of bus capacitor - Google Patents
A kind of AC-DC isolated variable circuits for soft of bus capacitor Download PDFInfo
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- CN207926461U CN207926461U CN201820424794.8U CN201820424794U CN207926461U CN 207926461 U CN207926461 U CN 207926461U CN 201820424794 U CN201820424794 U CN 201820424794U CN 207926461 U CN207926461 U CN 207926461U
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Abstract
The utility model provides a kind of AC DC isolated variable circuits for soft of bus capacitor, belongs to field of switch power, powers to bus capacitor CBUS for alternating current, including：Current rectifying and wave filtering circuit, first order inverse-excitation converting circuit, second level THE BOOST SWITCHING CIRCUIT, current-limiting circuit, first order power supply control chip and second level power supply control chip.Based on above-mentioned AC DC isolated variable circuits, the rectified filter circuit of alternating current obtains direct current, direct current first exports after the isolation of first order inverse-excitation converting circuit to second level THE BOOST SWITCHING CIRCUIT, it is exported after soft process of second level THE BOOST SWITCHING CIRCUIT current limited boost to current-limiting circuit again, bus capacitor CBUS chargings are most given after current-limiting circuit current limliting afterwards, until voltage is sufficiently high on bus capacitor CBUS.Successively worked based on first order inverse-excitation converting circuit and second level THE BOOST SWITCHING CIRCUIT, to reduce first order inverse-excitation converting circuit outlet side diode voltage stress requirement.
Description
Technical field
The utility model belongs to field of switch power, more particularly to a kind of AC-DC for soft of bus capacitor, which is isolated, to be become
Change circuit.
Background technology
Photovoltaic energy storage inverter usually has the dc-link capacitance CBUS of large capacity, the both ends of bus capacitor CBUS to be parallel with
Equivalent load RL.Energy storage inverter can connect photovoltaic panel, battery and alternating current and work under normal circumstances, and bus capacitor is by photovoltaic
Plate or battery carry out soft.
In the case of connecing photovoltaic panel, battery power shortage, then need inverter can be directly from alternating current
Side carries out soft raising to high pressure, so that inverter self can start from mains side, into work to bus capacitor
It charges to the battery of power shortage after pattern.Since bus capacitor CBUS is a great capacitive load, so needing to mother
Line capacitance CBUS carries out soft current-limiting charge.And bus capacitor is in DC side, so necessary when from mains side is soft to its
Carry out electrical isolation.Common inverse-excitation converting circuit output voltage is generally all relatively low, if design it is relatively high if, meeting
Inverse-excitation converting circuit outlet side diode is set to bear high voltage stress.
Utility model content
In order to solve shortcoming and defect existing in the prior art, the utility model provides a kind of to the defeated of AC power
Go out voltage successively after rectified filtering, flyback isolation and soft of current limited boost can soft bus capacitor CBUS to high pressure
AC-DC isolated variable circuits, and then solve common inverse-excitation converting circuit outlet side diode and bear high voltage stress
Problem.
In order to reach above-mentioned technical purpose, it is isolated the utility model proposes a kind of AC-DC for soft of bus capacitor and becomes
Circuit is changed, is powered to dc-link capacitance CBUS for alternating current, the AC-DC isolated variables circuit, including：
The output end of current rectifying and wave filtering circuit for being connect with AC power, current rectifying and wave filtering circuit is connected with first order flyback
The output end of translation circuit, first order inverse-excitation converting circuit is connected with second level THE BOOST SWITCHING CIRCUIT, second level boosted switch electricity
The output end on road connects current limit circuit, and the output end of current-limiting circuit connects bus capacitor CBUS, first order inverse-excitation converting circuit
It is also associated with the first order power supply control chip for being controlled first order inverse-excitation converting circuit, second level boosted switch electricity
Road is also associated with the second level power supply control chip for being controlled second level THE BOOST SWITCHING CIRCUIT.
Optionally, the current-limiting circuit includes current-limiting resistance.
Optionally, the current rectifying and wave filtering circuit includes rectifier bridge and filter capacitor C1, and the input terminal connection of rectifier bridge is handed over
Galvanic electricity source, the output end connection filter capacitor C1 of rectifier bridge.
Optionally, the first order inverse-excitation converting circuit includes transformer T1, switching tube Q1, diode D6, capacitance C3, is become
One end of one end connection filter capacitor C1 of depressor T1 primary coils, the other end connecting valve pipe Q1 of transformer T1 primary coils
Drain electrode, the grid of switching tube Q1 connects the first order power supply control chip for controlling switching tube Q1, the source electrode of switching tube Q1
The other end of filter capacitor C1 is connected, the other end ground connection of filter capacitor C1, one end of transformer T1 secondary coils is through diode
The other end of D6, capacitance C3 connection transformer T1 secondary coils, the other end ground connection of transformer T1 secondary coils.
Optionally, the second level THE BOOST SWITCHING CIRCUIT includes energy storage inductor L1, switching tube Q2, diode D7, Yi Ji electricity
Hold C4, the cathode of one end connection diode D6 of energy storage inductor L1, the drain electrode of one end connecting valve pipe Q2 of energy storage inductor L1 is opened
Second level power supply control chip of the grid connection of pipe Q2 for controlling switching tube Q2 is closed, the source electrode of switching tube Q2 connects transformer
The other end of T1 secondary coils, the other end of inductance L1 through diode D7, capacitance C4 connection transformer T1 secondary coils it is another
End.
Optionally, the first order inverse-excitation converting circuit further includes the leakage inductance energy for absorbing transformer T1 storages
RCD clamp circuits.
Optionally, the RCD clamp circuits include resistance R1, capacitance C2, diode D5, and one end of resistance R1 connects transformation
One end of device T1 primary coils, the cathode of the other end connection diode D5 of resistance R1, the both ends connection capacitance C2 of resistance R1, two
The other end of the anode connection transformer T1 primary coils of pole pipe D5.
The advantageous effect that technical solution provided by the utility model is brought is：
1, the design based on first order inverse-excitation converting circuit, realizes electrical isolation；
2, it based on the design for increasing second level THE BOOST SWITCHING CIRCUIT in the design of first order inverse-excitation converting circuit, reduces
The output voltage of first order inverse-excitation converting circuit, is conducive to the design of first order circuit transformer；
3, the design based on first order inverse-excitation converting circuit and second level THE BOOST SWITCHING CIRCUIT, reduces first order circuit device
The voltage stress of part such as reduces the requirement of circuit of reversed excitation outlet side diode voltage stress, and strong with large capacitive load ability.
Description of the drawings
It, below will be to needed in embodiment description in order to illustrate more clearly of the technical solution of the utility model
Attached drawing is briefly described, it should be apparent that, the accompanying drawings in the following description is only some embodiments of the utility model, for
For those of ordinary skill in the art, without creative efforts, other are can also be obtained according to these attached drawings
Attached drawing.
Fig. 1 is that a kind of structure of AC-DC isolated variable circuits for soft of bus capacitor provided by the utility model is shown
It is intended to；
Fig. 2 is a kind of circuit diagram of AC-DC isolated variable circuits for soft of bus capacitor provided by the utility model.
Specific implementation mode
It is clearer for the structure and advantage that make the utility model, the structure of the utility model is made below in conjunction with attached drawing
It is further described through.
Embodiment one
The utility model proposes a kind of AC-DC isolated variable circuits for soft of bus capacitor, for bus capacitor
Soft of voltage CBUS, as shown in Figure 1, the AC-DC isolated variables circuit, including：
The output end of current rectifying and wave filtering circuit for being connect with AC power, current rectifying and wave filtering circuit is connected with first order flyback
The output end of translation circuit, first order inverse-excitation converting circuit is connected with second level THE BOOST SWITCHING CIRCUIT, second level boosted switch electricity
The output end on road connects current limit circuit, and the output end of current-limiting circuit connects bus capacitor CBUS, the both ends of bus capacitor CBUS
It is connected in parallel on load RL, first order inverse-excitation converting circuit is also associated with for being controlled first order inverse-excitation converting circuit
Primary power source controls chip, and second level THE BOOST SWITCHING CIRCUIT is also associated with for being controlled second level THE BOOST SWITCHING CIRCUIT
Second level power supply control chip.
In force, general as described above, if powered to bus capacitor CBUS using common inverse-excitation converting circuit
The output voltage of logical inverse-excitation converting circuit must be very high, but the output voltage of common inverse-excitation converting circuit higher can make inverse-excitation converting
Circuit output side diode bears high voltage stress.Output voltage in order to solve common inverse-excitation converting circuit is higher to be made
The problem of inverse-excitation converting circuit outlet side diode bears high voltage stress, the present embodiment propose a kind of for bus capacitor
Soft AC-DC isolated variable circuit carries out soft, AC-DC isolated variables for electric main to dc-link capacitance CBUS
Circuit includes current rectifying and wave filtering circuit, first order inverse-excitation converting circuit, second level THE BOOST SWITCHING CIRCUIT, the first level power supply control core
Piece, second level power supply control chip, current-limiting circuit.
AC-DC isolated variable circuit operation principles：In the case of input AC alternating current (230V), electric main is rectified
Smoother direct current, DC supply input first order inverse-excitation converting circuit are obtained after filtering, first order inverse-excitation converting circuit exists
The control of first order power supply control chip is lower to enter working condition, and direct current exports after first order inverse-excitation converting circuit electrical isolation
280V direct currents, the direct current are pre-charged bus capacitor CBUS.
The supply voltage for just having started second level power supply control chip is less than the startup voltage of second level power supply control chip, greatly
Supply voltage reaches the startup voltage of second level power supply control chip after about 4 seconds, and second level THE BOOST SWITCHING CIRCUIT is in second level electricity
Source, which controls, enters working condition under chip controls, stablize output 900V direct currents after about 14 seconds soft process of current limited boost
Pressure, 900V DC voltages are exported after current-limiting circuit current limliting to bus capacitor CBUS again so that voltage foot on bus capacitor CBUS
Enough height.
It is successively worked based on above-mentioned first order inverse-excitation converting circuit and second level THE BOOST SWITCHING CIRCUIT, reduces the first order
The requirement of the voltage stress of inverse-excitation converting circuit outlet side diode, and it is strong with large capacitive load ability.
In addition, based on second level THE BOOST SWITCHING CIRCUIT is increased on the basis of first order inverse-excitation converting circuit, reduce
The output voltage of first order inverse-excitation converting circuit, to be conducive to the design of first order inverse-excitation converting circuit.
In addition, in the present embodiment first order power supply control chip model ICE3BR0680JZ, wherein the second level power supply
The type for controlling chip is the power supply control chip with soft function of current limliting, the model of the second level power supply control chip
It is all made of peak-current mode controlling party inside UC2842D8, first order power supply control chip and second level power supply control chip
Formula.
Optionally, the current-limiting circuit includes current-limiting resistance.
In force, current-limiting circuit, current limliting electricity are additionally provided between second level THE BOOST SWITCHING CIRCUIT and bus capacitor CBUS
Road includes current-limiting resistance, only with a current-limiting resistance Rrestrict in the present embodiment, as shown in Fig. 2, current-limiting resistance
One end of Rrestrict connects second level THE BOOST SWITCHING CIRCUIT, and the other end of current-limiting resistance Rrestrict connects bus capacitor
The effect of CBUS, current-limiting resistance Rrestrict are limitation bus capacitor CBUS charging currents, to reach the entire circuit of reduction
Peak power purpose so that entire circuit can normally start, can not to will not be forever all in the state started repeatedly
Normal work.
Optionally, as shown in Fig. 2, the current rectifying and wave filtering circuit includes rectifier bridge and filter capacitor C1, rectifier bridge it is defeated
Enter end connection AC power, the output end connection filter capacitor C1 of rectifier bridge.
In force, input first order inverse-excitation converting is electric after current rectifying and wave filtering circuit is used to electric main being converted into direct current
Road, current rectifying and wave filtering circuit include rectifier bridge and filter capacitor C1, the alternating current direct current that first rectified bridge is pulsed, direct current
Filtered capacitance C1 filtering clutters, obtain smoother direct current, and by DC supply input first order inverse-excitation converting circuit.
Optionally, as shown in Fig. 2, the first order inverse-excitation converting circuit includes transformer T1, switching tube Q1, diode
D6, capacitance C3, one end of one end connection filter capacitor C1 of transformer T1 primary coils, the other end of transformer T1 primary coils
The drain electrode of connecting valve pipe Q1, the grid of switching tube Q1 connect the first order power supply control chip for controlling switching tube Q1, open
The other end of the source electrode connection filter capacitor C1 of pipe Q1 is closed, the other end of filter capacitor C1 is grounded, transformer T1 secondary coils
The other end of the one end through diode D6, capacitance C3 connection transformer T1 secondary coils, another termination of transformer T1 secondary coils
Ground.
In force, as described above, first order inverse-excitation converting circuit carries out electrical isolation to the DC voltage of input
After export to second level THE BOOST SWITCHING CIRCUIT, second level power supply power supply chip, bus capacitor CBUS.At this point, first order flyback becomes
The output voltage for changing circuit is used to power to second level THE BOOST SWITCHING CIRCUIT and second level power supply control chip, is additionally operable to busbar
Capacitance CBUS precharge.
In addition, first order inverse-excitation converting circuit, which has also risen, reduces switch tube Q1 when second level THE BOOST SWITCHING CIRCUIT starts
The effect of current stress.Since first order inverse-excitation converting circuit is pre-charged to bus capacitor, lead to second level THE BOOST SWITCHING CIRCUIT
The current stress of switching tube Q1 is reduced when startup.
Optionally, the first order inverse-excitation converting circuit further includes the leakage inductance energy for absorbing transformer T1 storages
RCD clamp circuits.
Optionally, as shown in Fig. 2, the RCD clamp circuits include resistance R1, capacitance C2, diode D5, the one of resistance R1
One end of end connection transformer T1 primary coils, the cathode of the other end connection diode D5 of resistance R1, the both ends of resistance R1 connect
Connect capacitance C2, the other end of the anode connection transformer T1 primary coils of diode D5.
In force, all there is leakage inductance in any transformer, and because transformer T1 is there are leakage inductance, first order inverse-excitation converting circuit exists
Switching tube Q1 shutdown moments will produce prodigious peak voltage so that switching tube Q1 bears higher voltage stress, in some instances it may even be possible to
Switching tube Q1 is damaged, therefore increases RCD clamp circuits in first order inverse-excitation converting circuit, for absorbing transformer T1 storages
Leakage inductance energy ensure that first order inverse-excitation converting circuit can work normally to achieve the purpose that eliminate peak voltage.
Optionally, as shown in Fig. 2, the second level THE BOOST SWITCHING CIRCUIT includes energy storage inductor L1, switching tube Q2, diode
The cathode of one end connection diode D6 of D7 and capacitance C4, energy storage inductor L1, one end connecting valve pipe Q2 of energy storage inductor L1
Drain electrode, the grid of switching tube Q2 connects the second level power supply control chip for controlling switching tube Q2, the source electrode of switching tube Q2
The other end of transformer T1 secondary coils is connected, the other end of inductance L1 is through diode D7, capacitance C4 connection T1 grade of transformer
The other end of coil.
In force, when the supply voltage of second level power supply control chip reaches the initiation value of second level power supply control chip
When, second level THE BOOST SWITCHING CIRCUIT enters working condition under the control of second level power supply control chip, is risen through current limited boost is soft
Cheng Hou gives bus capacitor CBUS current-limiting charges, until voltage is sufficiently high on bus capacitor CBUS.
It is used for the product of bus capacitor CBUS power supplies relative to other, one kind that the present embodiment proposes is used for bus capacitor
Soft AC-DC isolated variable circuit, because of the switching tube inside first order inverse-excitation converting circuit and second level THE BOOST SWITCHING CIRCUIT
Quantity is few and pure simulation control, to reach lower-cost purpose.
The utility model provides a kind of AC-DC isolated variable circuits for soft of bus capacitor, for busbar electricity
Hold voltage CBUS soft, including：Current rectifying and wave filtering circuit, first order inverse-excitation converting circuit, second level THE BOOST SWITCHING CIRCUIT, first
Level power supply controls chip and second level power supply control chip.Based on above-mentioned boosting AC-DC isolated variable circuits, the first level power supply
The work of chip controls first order inverse-excitation converting circuit is controlled, the DC voltage of input is isolated in first order inverse-excitation converting circuit
After export to second level THE BOOST SWITCHING CIRCUIT, second level power supply control chip, bus capacitor CBUS.When the second level power supply controls core
When the supply voltage of piece reaches the initiation value of second level power supply control chip, second level power supply control chip starts to control the second level
THE BOOST SWITCHING CIRCUIT works, and after soft process of current limited boost, gives bus capacitor current-limiting charge, may finally make bus capacitor
CBUS reaches the high pressure of soft needs of inverter.
Each serial number in above-described embodiment is for illustration only, the assembling for not representing each component or the elder generation during use
Sequence afterwards.
The above description is only the embodiments of the present invention, is not intended to limit the utility model, all in the utility model
Spirit and principle within, any modification, equivalent replacement, improvement and so on should be included in the protection model of the utility model
Within enclosing.
Claims (7)
1. a kind of AC-DC isolated variable circuits for soft of bus capacitor are powered for alternating current to dc-link capacitance CBUS,
It is characterized in that, the AC-DC isolated variables circuit, including：
The output end of current rectifying and wave filtering circuit for being connect with AC power, current rectifying and wave filtering circuit is connected with first order inverse-excitation converting
The output end of circuit, first order inverse-excitation converting circuit is connected with second level THE BOOST SWITCHING CIRCUIT, second level THE BOOST SWITCHING CIRCUIT
Output end connects current limit circuit, and the output end of current-limiting circuit connects bus capacitor CBUS, and first order inverse-excitation converting circuit also connects
It is connected to the first order power supply control chip for being controlled first order inverse-excitation converting circuit, second level THE BOOST SWITCHING CIRCUIT is also
It is connected with the second level power supply control chip for being controlled second level THE BOOST SWITCHING CIRCUIT.
2. a kind of AC-DC isolated variable circuits for soft of bus capacitor according to claim 1, which is characterized in that
The current-limiting circuit includes current-limiting resistance.
3. a kind of AC-DC isolated variable circuits for soft of bus capacitor according to claim 1, which is characterized in that
The current rectifying and wave filtering circuit includes rectifier bridge and filter capacitor C1, and the input terminal of rectifier bridge connects AC power, rectifier bridge
Output end connects filter capacitor C1.
4. a kind of AC-DC isolated variable circuits for soft of bus capacitor according to claim 3, which is characterized in that
The first order inverse-excitation converting circuit includes transformer T1, switching tube Q1, diode D6, capacitance C3, transformer T1 primary coils
One end connection filter capacitor C1 one end, the drain electrode of the other end connecting valve pipe Q1 of transformer T1 primary coils, switching tube
The grid of Q1 connects the first order power supply control chip for controlling switching tube Q1, the source electrode connection filter capacitor C1 of switching tube Q1
The other end, the other end ground connection of filter capacitor C1, one end of transformer T1 secondary coils is through diode D6, capacitance C3 connections change
The other end of depressor T1 secondary coils, the other end ground connection of transformer T1 secondary coils.
5. a kind of AC-DC isolated variable circuits for soft of bus capacitor according to claim 4, which is characterized in that
The second level THE BOOST SWITCHING CIRCUIT includes energy storage inductor L1, switching tube Q2, diode D7 and capacitance C4, energy storage inductor L1
One end connection diode D6 cathode, the grid of the drain electrode of one end connecting valve pipe Q2 of energy storage inductor L1, switching tube Q2 connects
The second level power supply control chip for controlling switching tube Q2 is connect, the source electrode of switching tube Q2 connects the another of transformer T1 secondary coils
One end, the other end of the other end through diode D7, capacitance C4 connection transformer T1 secondary coils of inductance L1.
6. a kind of AC-DC isolated variable circuits for soft of bus capacitor according to claim 4, which is characterized in that
The first order inverse-excitation converting circuit further includes the RCD clamp circuits of the leakage inductance energy for absorbing transformer T1 storages.
7. a kind of AC-DC isolated variable circuits for soft of bus capacitor according to claim 6, which is characterized in that
The RCD clamp circuits include resistance R1, capacitance C2, diode D5, and one end of resistance R1 connects transformer T1 primary coils
The both ends of one end, the cathode of the other end connection diode D5 of resistance R1, resistance R1 connect capacitance C2, and the anode of diode D5 is even
Connect the other end of transformer T1 primary coils.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201820424794.8U CN207926461U (en) | 2018-03-28 | 2018-03-28 | A kind of AC-DC isolated variable circuits for soft of bus capacitor |
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| CN201820424794.8U CN207926461U (en) | 2018-03-28 | 2018-03-28 | A kind of AC-DC isolated variable circuits for soft of bus capacitor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109600059A (en) * | 2018-12-18 | 2019-04-09 | 航天柏克(广东)科技有限公司 | A kind of soft starting circuit of DC bus-bar voltage |
-
2018
- 2018-03-28 CN CN201820424794.8U patent/CN207926461U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109600059A (en) * | 2018-12-18 | 2019-04-09 | 航天柏克(广东)科技有限公司 | A kind of soft starting circuit of DC bus-bar voltage |
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Address after: 311500 No. 288 Shizhu Road, Tonglu Economic Development Zone, Hangzhou City, Zhejiang Province Patentee after: Zhejiang arrow network energy technology Co.,Ltd. Address before: 311500 No. 288 Shizhu Road, Tonglu Economic Development Zone, Hangzhou City, Zhejiang Province Patentee before: ZHEJIANG SOLAX NETWORK ENERGY TECHNOLOGY Co.,Ltd. |