CN205992854U - A kind of soft starting circuit and electrical equipment - Google Patents

A kind of soft starting circuit and electrical equipment Download PDF

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Publication number
CN205992854U
CN205992854U CN201620766261.9U CN201620766261U CN205992854U CN 205992854 U CN205992854 U CN 205992854U CN 201620766261 U CN201620766261 U CN 201620766261U CN 205992854 U CN205992854 U CN 205992854U
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China
Prior art keywords
winding
full bridge
bridge rectifier
starting circuit
soft
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CN201620766261.9U
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Inventor
程尧
邓立荣
陈小刚
张虎
王冰
刘长坤
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Sungrow Power Supply Co Ltd
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Sungrow Power Supply Co Ltd
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Abstract

This application discloses a kind of soft starting circuit and electrical equipment, described soft starting circuit includes catalyst, current-limiting resistance, three winding booster transformer, the first full bridge rectifier, the second full bridge rectifier and relay, wherein:The primary side winding of described three winding booster transformer sequentially passes through described current-limiting resistance and described catalyst accesses electrical network;First vice-side winding of described three winding booster transformer connects the AC of described first full bridge rectifier;Second vice-side winding of described three winding booster transformer connects the AC of described second full bridge rectifier;The DC side of described first full bridge rectifier is connected to positive pole line capacitance two ends through described relay;The DC side of described second full bridge rectifier is connected to negative busbar electric capacity two ends through described relay.The application avoids in soft start-up process and rectification bridge switch excessive pressure damages phenomenon after the completion of soft start.

Description

A kind of soft starting circuit and electrical equipment
Technical field
This utility model is related to electric and electronic technical field, more particularly, it relates to a kind of soft starting circuit and electrically setting Standby.
Background technology
The topological structure of neutral point clamp type three-level inverter is as shown in figure 1, include inverter bridge, positive pole line capacitance CpWith negative Bus capacitor Cn, wherein:Positive pole line capacitance CpIt is connected between the positive direct-current bus Bus+ of inverter and neutral point O;Negative busbar electricity Hold CnIt is connected between the negative dc bus Bus- of inverter and neutral point O.
Neutral point clamp type three-level inverter first has to carry out soft start before normal operation, by CpAnd CnCharge to equilibrium Stable operation voltage.Its soft starting circuit adopting at present is as shown in Fig. 2 include catalyst K, three-phase double winding boosting transformation Device T, current-limiting resistance R and the full bridge rectifier Z being formed by connecting by 4 rectification bridge switch, wherein:Three-phase double winding boosting transformation The primary side winding of device T accesses electrical network through catalyst K;A, C two phase winding in the vice-side winding of three-phase double winding booster transformer T Connect the AC of full bridge rectifier Z, its B phase winding connects the neutral point O of inverter;The DC side of full bridge rectifier Z Connect the positive and negative dc bus of inverter through current-limiting resistance R.Catalyst K closure when needing to carry out soft start, complete in soft start Disconnect after one-tenth.
But there is following defect in this soft starting circuit:In soft start-up process, each of full bridge rectifier Z rectification Bridge switch is required for bearing the half of whole DC bus-bar voltage stress, easily causes rectifier bridge switching device excessive pressure damages.
Utility model content
In view of this, this utility model provides a kind of soft starting circuit and electrical equipment, to avoid going out in soft start-up process Existing rectification bridge switch excessive pressure damages phenomenon.
A kind of soft starting circuit, including:
Catalyst, current-limiting resistance, three winding booster transformer, the first full bridge rectifier, the second full bridge rectifier and Relay, wherein:
The primary side winding of described three winding booster transformer sequentially passes through described current-limiting resistance and described catalyst accesses electricity Net;
First vice-side winding of described three winding booster transformer connects the AC of described first full bridge rectifier;
Second vice-side winding of described three winding booster transformer connects the AC of described second full bridge rectifier;
The DC side of described first full bridge rectifier is connected to positive pole line capacitance two ends through described relay;
The DC side of described second full bridge rectifier is connected to negative busbar electric capacity two ends through described relay.
Wherein, described first full bridge rectifier and described second full bridge rectifier are diode full-bridge rectification electricity Road.
Wherein, described electrical network is single-phase electrical network or three phase network.
Wherein, in described soft starting circuit is used for realizing during the soft start of voltage electrical equipment, described electrical network is low tension Net;
When described soft starting circuit be used for realize high voltage electric equipment soft start when, described electrical network be low voltage electric network or in Voltage electric grid.
Wherein, described first full bridge rectifier and described second full bridge rectifier are all by four rectifier bridge switching tubes It is formed by connecting.
Alternatively, described soft starting circuit also includes:It is connected to the fuse between described electrical network and described catalyst.
A kind of electrical equipment, including:Inverter bridge, positive pole line capacitance, negative busbar electric capacity and disclosed above any one are soft Start-up circuit.
A kind of electrical equipment, including inverter bridge, positive pole line capacitance, negative busbar electric capacity, catalyst, current-limiting resistance, double winding Booster transformer and relay, wherein:
The primary side winding of described double winding booster transformer sequentially passes through described current-limiting resistance and described catalyst accesses electricity Net;
When described electrical network is single-phase electrical network, described double winding booster transformer is single-phase double winding booster transformer, its Vice-side winding connects any two brachium pontis outfan of described inverter bridge through described relay;
When described electrical network is three phase network, described double winding booster transformer is three-phase double winding booster transformer, its A, B, C three-phase windings in vice-side winding connect three brachium pontis outfans of described inverter bridge through described relay.
Alternatively, described soft starting circuit also includes:It is connected to the fuse between described electrical network and described catalyst.
Wherein, described electrical equipment is neutral point clamp type three-level inverter or neutral point clamp type three-level current transformer.
It can be seen from above-mentioned technical scheme that, compared to prior art, soft starting circuit disclosed in this utility model leads to Cross and introduce more rectification bridge switch to share DC bus-bar voltage stress, thus reducing each rectification bridge switch at midpoint Need the DC bus-bar voltage stress individually bearing in Clamp three-level inverter soft start-up process, effectively prevent rectifier bridge Switch excessive pressure damages in soft start-up process, solve the problems, such as prior art.
Brief description
In order to be illustrated more clearly that this utility model embodiment or technical scheme of the prior art, below will be to embodiment Or in description of the prior art the accompanying drawing of required use be briefly described it should be apparent that, drawings in the following description are only It is some embodiments of the present utility model, for those of ordinary skill in the art, in the premise not paying creative work Under, other accompanying drawings can also be obtained according to these accompanying drawings.
Fig. 1 is a kind of neutral point clamp type three-level inverter topology structural representation disclosed in prior art;
Fig. 2 is a kind of soft start circuit structure schematic diagram disclosed in prior art;
Fig. 3 is a kind of soft start circuit structure schematic diagram disclosed in this utility model;
Fig. 4 is this utility model another soft start circuit structure schematic diagram disclosed;
Fig. 5 is this utility model another soft start circuit structure schematic diagram disclosed;
Fig. 6 is a kind of installation structures schematic diagram disclosed in this utility model;
Fig. 7 is this utility model another installation structures schematic diagram disclosed.
Specific embodiment
Below in conjunction with the accompanying drawing in this utility model embodiment, the technical scheme in this utility model embodiment is carried out Clearly and completely description is it is clear that described embodiment is only a part of embodiment of this utility model rather than whole Embodiment.Based on the embodiment in this utility model, those of ordinary skill in the art are not under the premise of making creative work The every other embodiment being obtained, broadly falls into the scope of this utility model protection.
Referring to Fig. 3, this utility model embodiment discloses a kind of soft starting circuit, whole to avoid occurring in soft start-up process Stream bridge switch excessive pressure damages phenomenon, including:
Catalyst K, current-limiting resistance R, three winding booster transformer T, the first full bridge rectifier Z1, the second full-bridge rectification electricity Road Z2 and relay KM, wherein:
The primary side winding of three winding booster transformer T sequentially passes through current-limiting resistance R and catalyst K and accesses electrical network;
First vice-side winding of three winding booster transformer T connects the AC of the first full bridge rectifier Z1;
Second vice-side winding of three winding booster transformer T connects the AC of the second full bridge rectifier Z2;
The DC side of the first full bridge rectifier Z1 is connected to positive pole line capacitance C through relay KMpTwo ends;
The DC side of the second full bridge rectifier Z2 is connected to negative busbar electric capacity C through relay KMnTwo ends.
The operation principle of soft starting circuit shown in Fig. 3 is:Need to carry out soft start in neutral point clamp type three-level inverter When, first closing relay KM, be closed again catalyst K, now line voltage through catalyst K and current-limiting resistance R export three around The low-pressure side of group booster transformer T;Three winding is boosted transformation by the first full bridge rectifier Z1 and the second full bridge rectifier Z2 The two-way high-voltage AC signal of device T high-pressure side output is rectified into two-way direct current signal, respectively CpAnd CnCharge;Complete in soft start Relay KM must be disconnected after one-tenth, otherwise in the normal operation of neutral point clamp type three-level inverter, the high pressure of inverter bridge output Can be applied on full bridge rectifier Z and easily cause rectifier bridge switching device excessive pressure damages.Current-limiting resistance R is used for limiting soft start Electric current, its resistance size affects the capacity of soft-start time and three winding booster transformer T.
Soft starting circuit shown in Fig. 3 has following advantage compared to Fig. 2:
1) compared to Fig. 2, soft starting circuit shown in Fig. 3 utilizes in neutral point clamp type three-level inverter soft start-up process Two full bridge rectifiers bear whole DC bus-bar voltage stress jointly, and each full bridge rectifier is subjected only to whole direct current The 1/2 of busbar voltage stress, when each rectification bridge switch is to be formed by connecting by 4 rectification bridge switch, each rectification Bridge switch is subjected only to the 1/4 of whole DC bus-bar voltage stress (if each rectifier bridge in inverter soft start-up process Switch N number of rectification bridge switch of connecting respectively again, then each rectification bridge switch is subjected only to entirely in inverter soft start-up process 1/ (N+1) of DC bus-bar voltage stress, generally arranges each rectification bridge switch and is only formed by connecting i.e. by 4 rectification bridge switch Can be it is not necessary to excessive introduce), because the DC bus-bar voltage stress that single full bridge rectifier is born greatly reduces, thus have Effect avoids rectification bridge switch excessive pressure damages phenomenon in soft start-up process;
2), in soft starting circuit shown in Fig. 2, in inverter normal course of operation after the completion of soft start, inverter bridge exports High pressure can be applied on full bridge rectifier Z, easily cause rectifier bridge switching device excessive pressure damages;And soft start shown in Fig. 3 Full bridge rectifier and inverter bridge can be kept apart by circuit by disconnecting relay KM, so inversion after the completion of soft start In device normal course of operation, the high pressure that inverter bridge produces will not be applied to and cause rectifier bridge derailing switch on two full bridge rectifiers Part excessive pressure damages;
3) in soft starting circuit shown in Fig. 2, because B phase winding and neutral point O are direct-connected, straight therefore in soft start-up process Can there is low frequency pulsating on stream bus;And soft starting circuit shown in Fig. 3 does not have such annexation, thus also avoid This problem.
Alternatively, soft starting circuit disclosed in this utility model embodiment may also include:It is connected to described electrical network and contact Fuse FU between device K, as shown in Figure 4.Fuse FU is used for soft start overcurrent protection, short-circuit when occurring in soft start-up process Or the heat that during over current fault, fuse FU leans on itself to produce makes Melt molten with quick excision soft starting circuit.
Wherein, the type according to rectifier bridge switching device to be distinguishing, the first full bridge rectifier Z1 and the second full-bridge rectification Circuit Z2 can be diode full bridge rectifier or IGBT (Insulated Gate Bipolar Transistor, igbt) full bridge rectifier, but lower in view of diode full bridge rectifier cost, Therefore the present embodiment is using diode full bridge rectifier as preferred.
In soft starting circuit disclosed in this utility model embodiment, the specification of each part needs and its operational voltage level (root According to GB/T157-2007 standard, below 1kV is low pressure, and 3-35kV is middle pressure, and 35-220kV is high pressure) match, such as:When When described soft starting circuit connects medium voltage network, described soft starting circuit is used for realizing the soft start of high voltage electric equipment, described soft Catalyst K in start-up circuit is medium voltage contactor, and current-limiting resistance R is middle piezoresistance, and fuse FU is middle pressure fuse, relay Device KM is high-voltage relay;When described soft starting circuit connects low voltage electric network, described soft starting circuit is used for voltage electrical in realization Equipment or the soft start of high voltage electric equipment, the catalyst K in described soft starting circuit is lv contactor, and current-limiting resistance R is Low resistance, fuse FU is low-tension fuse, and described soft starting circuit is applied to relay KM during middle voltage electrical equipment and adopts Middle potential relay, described soft starting circuit is applied to relay KM during high voltage electric equipment and just adopts high-voltage relay.
Soft starting circuit disclosed in this utility model embodiment can adopt single phase power supply, it would however also be possible to employ three phase supply, In described soft starting circuit, the specification of each part needs to match with power supply, such as:Fig. 3-Fig. 4 is only soft to be opened with described Galvanic electricity road adopts single phase power supply as an example, and wherein three winding booster transformer T is single-phase three winding booster transformer, and first is complete Bridge rectification circuit Z1 and the second full bridge rectifier Z2 is single-phase full bridge rectification circuit;When described soft starting circuit adopts three-phase to supply When electric, three winding booster transformer T is three-phase three winding booster transformer, the first full bridge rectifier Z1 and the second full-bridge rectification Circuit Z2 is three-phase bridge rectification circuit, as shown in Figure 5.
This utility model embodiment also discloses a kind of electrical equipment, including:Inverter bridge, positive pole line capacitance, negative busbar electricity Hold and any one soft starting circuit disclosed above, to avoid rectification bridge switch excessive pressure damages occurring now in soft start-up process As.This electrical equipment can be neutral point clamp type three-level inverter or neutral point clamp type three-level current transformer.Midpoint Clamp three-level current transformer comprises the three-level inverter topology structure of neutral point clamp type shown in Fig. 1, same before normal operation Need to carry out soft start.
Additionally, referring to Fig. 6-Fig. 7, this utility model embodiment also discloses another electrical equipment, this electrical equipment bag Include inverter bridge, positive pole line capacitance Cp, negative busbar electric capacity Cn, catalyst K, current-limiting resistance R, double winding booster transformer T and relay KM, wherein:
The primary side winding of double winding booster transformer T sequentially passes through current-limiting resistance R and catalyst K and accesses electrical network;
When described electrical network is single-phase electrical network, double winding booster transformer T is single-phase double winding booster transformer T, and it is secondary Side winding connects any two brachium pontis outfan of described inverter bridge through relay KM, as shown in Figure 6;
When described electrical network is three phase network, double winding booster transformer T is three-phase double winding booster transformer T, and it is secondary A, B, C three-phase windings in the winding of side connect three brachium pontis outfans of described inverter bridge through relay KM, as shown in Figure 7.
Compared to aforementioned disclosed electrical equipment, electrical equipment shown in Fig. 6-Fig. 7 directly utilizes existing continuous in inverter bridge Between stream diode and each fly-wheel diode, existing annexation obtains a full bridge rectifier, because the present embodiment directly will Fly-wheel diode serves as commutation diode and uses, thus has saved cost of investment.Specifically, it is to utilize fly-wheel diode in Fig. 6 D1-D8 serves as commutation diode and uses, and is to serve as commutation diode using sustained diode 1-D12 to use in Fig. 7, compared to Prior art, this embodiment introduces more commutation diode is sharing DC bus-bar voltage stress, each afterflow two pole Pipe is subjected only to the 1/4 of whole DC bus-bar voltage stress in soft start-up process, thus can be prevented effectively from rectification bridge switch and exist Excessive pressure damages in soft start-up process.
The operation principle of soft starting circuit shown in Fig. 6 or Fig. 7 is:When needing to carry out soft start, first closing relay KM, It is closed again catalyst K, now line voltage exports the low pressure of double winding booster transformer T through catalyst K and current-limiting resistance R Side;The high-voltage AC signal that double winding booster transformer T high-pressure side exports is rectified into direct current signal by described full bridge rectifier It is C afterwardspAnd CnCharge;After the completion of soft start, relay KM is disconnected, now each fly-wheel diode recovers normal use, due to When there is not full bridge rectifier after the completion of soft start, thus also just not depositing that inverter normally runs in fig. 2, inverter bridge is produced Raw high pressure is applied to the problem causing commutation diode excessive pressure damages on full bridge rectifier.It is additionally, since Fig. 6 or Fig. 7 not Deposit the annexation direct-connected with neutral point O of B phase winding in fig. 2, thus be equally not result in dc bus in soft start-up process Upper generation low frequency pulsating.
In soft starting circuit disclosed in this utility model embodiment, the specification of each part needs and its operational voltage level phase Coupling, it is no longer repeated herein.
Alternatively, electrical equipment described in Fig. 6 or Fig. 7 also includes:It is connected to molten between described electrical network and described catalyst Disconnected device.
In sum, compared to prior art, soft starting circuit disclosed in this utility model passes through to introduce more rectifications Bridge switch sharing DC bus-bar voltage stress, thus reducing each rectification bridge switch in neutral point clamp type tri-level inversion Need the DC bus-bar voltage stress individually bearing in device soft start-up process, effectively prevent rectification bridge switch in soft start-up process Middle excessive pressure damages, solve the problems, such as prior art.
In this specification, each embodiment is described by the way of going forward one by one, and what each embodiment stressed is and other The difference of embodiment, between each embodiment identical similar portion mutually referring to.
Described above to the disclosed embodiments, makes professional and technical personnel in the field be capable of or new using this practicality Type.Multiple modifications to these embodiments will be apparent from for those skilled in the art, is determined herein The General Principle of justice can be realized in the case of without departing from spirit or scope of the present utility model in other embodiments.Cause This, this utility model is not intended to be limited to the embodiments shown herein, and is to fit to and principles disclosed herein The wide scope consistent with features of novelty.

Claims (10)

1. a kind of soft starting circuit is it is characterised in that include:
Catalyst, current-limiting resistance, three winding booster transformer, the first full bridge rectifier, the second full bridge rectifier and relay Device, wherein:
The primary side winding of described three winding booster transformer sequentially passes through described current-limiting resistance and described catalyst accesses electrical network;
First vice-side winding of described three winding booster transformer connects the AC of described first full bridge rectifier;
Second vice-side winding of described three winding booster transformer connects the AC of described second full bridge rectifier;
The DC side of described first full bridge rectifier is connected to positive pole line capacitance two ends through described relay;
The DC side of described second full bridge rectifier is connected to negative busbar electric capacity two ends through described relay.
2. soft starting circuit according to claim 1 is it is characterised in that described first full bridge rectifier and described second Full bridge rectifier is diode full bridge rectifier.
3. soft starting circuit according to claim 1 is it is characterised in that described electrical network is single-phase electrical network or three phase network.
4. soft starting circuit according to claim 1 is it is characterised in that work as piezoelectricity during described soft starting circuit is used for realizing During the soft start of gas equipment, described electrical network is low voltage electric network;
When described soft starting circuit is used for the soft start realizing high voltage electric equipment, described electrical network is low voltage electric network or middle piezoelectricity Net.
5. soft starting circuit according to claim 1 is it is characterised in that described first full bridge rectifier and described second Full bridge rectifier is all to be formed by connecting by four rectifier bridge switching tubes.
6. the soft starting circuit according to any one of claim 1-5 is it is characterised in that described soft starting circuit also wraps Include:It is connected to the fuse between described electrical network and described catalyst.
7. a kind of electrical equipment is it is characterised in that include:Inverter bridge, positive pole line capacitance, negative busbar electric capacity and as claim Soft starting circuit any one of 1-6.
8. a kind of electrical equipment is it is characterised in that include inverter bridge, positive pole line capacitance, negative busbar electric capacity, catalyst, current limliting electricity Resistance, double winding booster transformer and relay, wherein:
The primary side winding of described double winding booster transformer sequentially passes through described current-limiting resistance and described catalyst accesses electrical network;
When described electrical network is single-phase electrical network, described double winding booster transformer is single-phase double winding booster transformer, its secondary Winding connects any two brachium pontis outfan of described inverter bridge through described relay;
When described electrical network is three phase network, described double winding booster transformer is three-phase double winding booster transformer, its secondary A, B, C three-phase windings in winding connect three brachium pontis outfans of described inverter bridge through described relay.
9. electrical equipment according to claim 8 is it is characterised in that described electrical equipment also includes:It is connected to described electricity Fuse between net and described catalyst.
10. the electrical equipment according to any one of claim 7-9 is it is characterised in that described electrical equipment is midpoint pincers Bit-type three-level inverter or neutral point clamp type three-level current transformer.
CN201620766261.9U 2016-07-20 2016-07-20 A kind of soft starting circuit and electrical equipment Active CN205992854U (en)

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Application Number Priority Date Filing Date Title
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109039061A (en) * 2018-08-29 2018-12-18 阳光电源股份有限公司 A kind of more level BOOST devices
CN112234855A (en) * 2020-09-30 2021-01-15 广东恒翼能科技有限公司 Direct-current soft start system and method of battery test equipment

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109039061A (en) * 2018-08-29 2018-12-18 阳光电源股份有限公司 A kind of more level BOOST devices
CN112234855A (en) * 2020-09-30 2021-01-15 广东恒翼能科技有限公司 Direct-current soft start system and method of battery test equipment

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