CN203135743U - Hybrid DCAC current transformer - Google Patents
Hybrid DCAC current transformer Download PDFInfo
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- CN203135743U CN203135743U CN 201320082352 CN201320082352U CN203135743U CN 203135743 U CN203135743 U CN 203135743U CN 201320082352 CN201320082352 CN 201320082352 CN 201320082352 U CN201320082352 U CN 201320082352U CN 203135743 U CN203135743 U CN 203135743U
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Abstract
The utility model provides a hybrid DCAC current transformer used for converting DC power source to AC power source and transmitting the AC power source to an AC electric supply system. The hybrid DCAC current transformer includes an input circuit, a fullhalf-bridge switching circuit and an output circuit. The input circuit is provided with a positive input terminal and a negative input terminal together connected to a DC power source. An output signal produced from an input signal through a voltage-reducing switching mode provided by the fullhalf-bridge switching circuit is output to an output circuit. The output circuit is provided with two AC signal output terminals used for connecting with the AC electric supply system. Therefore, the hybrid DCAC current transformer can realize signal switching in the voltage-reducing mode through the fullhalf-bridge switching circuit according to the amplitude of the visible input signals, so that power loss caused by circuit switching when the AC electric supply system are performing positive semi-cycle actions and negative semi-circle actions can be reduced with comparatively low switching signals.
Description
Technical field
The utility model refers to a kind of direct current/alternating current transformer, refers to a kind of mixed type direct current/alternating current transformer that can reduce switch cost especially.
Background technology
Known direct current/alternating current transformer often is used among the sun-generated electric power converting system, generally speaking, the sun-generated electric power converting system at first can by a DC-DC converter with the DC power supply lifting/voltage reducing after, again DC power supply is converted to form of communication and is sent to mains system.
The circuit of this direct current/alternating current transformer can be divided into semibridge system, two kinds of frameworks of full-bridge type, please refer to shown in Figure 6, circuit framework for known semibridge system current transformer, mainly be on a direct current power input DC+, DC-respectively cross-over connection the capacitor C 1 of series connection is arranged, C2 and first switch S 1, second switch S2, two capacitor C 1, the tandem node of C2 and first switch S 1, second switch S2 is provided with a rectification circuit 61.This rectification circuit 61 comprises that two are the rectifier diode D1 of reverse serial connection, D2, this two rectifier diode D1, D2 is located at first, second switch S 1, two capacitor C 1 of the series connection node of S2 and this input circuit, between the C2 series connection node, and two rectifier diode D1, D2 two ends cross-over connection respectively have one to switch switch S 3, S4.When civil power string wave voltage during at positive half cycle, 1 conducting of first switch S and second switch S2 end, and the output signal of current transformer is+DC/2, during the output circuit afterflow, make this first, second switch S 1, S2 and diverter switch S4 end, this rectifier diode D2 and diverter switch S3 conducting; When civil power string wave voltage during at negative half period, second switch S2 conducting and first switch S 1 are ended, and the output signal of current transformer is-DC/2, during the output circuit afterflow, make this first, second switch S 1, S2 and diverter switch S3 end, this rectifier diode D1 and diverter switch S4 conducting.Conducting by controlling first switch S 1 and second switch S2 with end, make this current transformer output signal for+DC/2 or-DC/2, and aforementioned DC/2 must be greater than the crest voltage of civil power; By as can be known aforementioned, the DC power supply DC step-down that half bridge circuit will be bigger is less direct current signal DC/2, is unlikely to cause the waste of power when making switch switch, and therefore is applicable to less city's signal of telecommunication.
If city's signal of telecommunication is during greater than aforementioned DC/2, half bridge circuit will not be inconsistent use, therefore, see also shown in Figure 7, then be the circuit framework of known full-bridge type current transformer, comprise the switches set that a direct current capacitor C 1, is made up of first to fourth switch S, 1 ~ S4, and two diverter switch S1, there are a rectifier diode D1, D2 in S2 two ends cross-over connection respectively.When this first switch S 1,4 conductings of the 4th switch S during at positive half cycle of civil power string wave voltage, and this second switch S2, the 3rd switch S 3 are ended, the output signal of this current transformer is+DC, during the output circuit afterflow, make this first, second and third switch S 1, S2, S3 ends, sustained diode 2 and diverter switch S4 conducting; When this second switch S2,3 conductings of the 3rd switch S during at negative half period of civil power string wave voltage, and this first switch S 1, the 4th switch S 4 are ended, the output signal of this current transformer is-DC, during the output circuit afterflow, make this first, second and the 4th switch S 1, S2, S4 ends, rectifier diode D1 and diverter switch S3 conducting; By as can be known aforementioned, DC power supply DC carries out the switch change action with full bridge circuit, is applicable to bigger city's signal of telecommunication.
From the above, when city's signal of telecommunication during greater than 1/2 times of DC power supply input signal, better results to use full bridge circuit, if city's signal of telecommunication is during less than 1/2 times of DC power supply input signal, use full bridge circuit can cause more power dissipation, use the benefit of half bridge circuit higher relatively.
The operation principle of aforesaid current transformer, please refer to shown in Figure 8, be the performance plot of this current transformer signal (VInverter) with civil power string ripple signal (VGrid) relation, because current transformer output signal DC must be greater than civil power string ripple signal, therefore no matter use semibridge system current transformer or full-bridge type current transformer, when civil power string ripple signal during at positive half cycle or negative half period, tend to make circuit when switching, to cause a large amount of power losses.
The utility model content
Because the shortcoming of above-mentioned prior art, the utility model main purpose is providing a kind of mixed type direct current/alternating current transformer, be connected between DC power supply and the electric main system, and the size that can cooperate input signal, use less switching signal, to reduce the power loss that is caused when diverter switch is switched.
Be to make aforementioned mixed type direct current/alternating current transformer be connected between DC power supply and the electric main system for reaching the major technique means that above-mentioned purpose takes, it comprises an input circuit, a full semi-bridge switching circuit; Wherein:
This input circuit has the electric capacity of a positive input terminal, a negative input end and two series connection; Have a string interlink point between the electric capacity of this series connection, the end in addition of the relative series connection node of two electric capacity is connected with this positive input terminal and negative input end respectively;
This full semi-bridge switching circuit comprises:
One full-bridge switch unit is connected with the positive and negative end input of aforementioned input circuit, mainly is made up of first to fourth switch, and this first, the 4th switch and second, third switch be serial connection and constitute one first output node and one second output node respectively in pairs;
One half-bridge rectification unit, comprise the 3rd, the 4th switch and two rectifier diodes that share with the full-bridge switch unit, two rectifier diodes are between reverse two electric capacity of being located at first output node and input circuit between the series connection node with connecting, and the two ends of each rectifier diode are cross-over connection one switching switch respectively;
One controller is connected with first to fourth switch, two diverter switches of aforementioned full semi-bridge switching circuit respectively.
The utility model mainly is by controller the input voltage of DC power supply and the voltage of civil power AC signal to be compared earlier, if the string wave voltage of civil power AC signal is during less than the input voltage of 1/2 DC power supply, worked by the half-bridge rectification unit, utilize switched voltage lower, reduce switching loss, when the string wave voltage of civil power AC signal during greater than 1/2 DC power supply input voltage, then worked by the full-bridge switch unit; Utilize above-mentioned technology to reduce loss, improve power supply conversion efficiency.
Description of drawings
Fig. 1 is the first preferred embodiment circuit framework figure of the present utility model;
Fig. 2 is the first preferred embodiment signal relation schematic diagram of the present utility model;
Fig. 3 is the second preferred embodiment circuit framework figure of the present utility model;
Fig. 4 is the 3rd preferred embodiment circuit framework figure of the present utility model;
Fig. 5 is the 4th preferred embodiment circuit framework figure of the present utility model;
Fig. 6 is a known semibridge system converter circuit Organization Chart;
Fig. 7 is a known full-bridge type converter circuit Organization Chart;
Fig. 8 is a known transformer and civil power signal relation schematic diagram.
Reference numeral
10 DC power supply, 20 input circuits
30 full semi-bridge switching circuit 31 full-bridge switch units
32 half-bridge rectification units, 33 controllers
40 output circuits, 41 filter circuits
50 electric main systems, 61 rectification circuits
Embodiment
About a preferred embodiment of the present utility model, please refer to shown in Figure 1, mixed type direct current/alternating current transformer of the present utility model is to be connected between DC power supply 10 and the electric main system 50, it comprises an input circuit 20, a full semi-bridge switching circuit 30, and further comprises an output circuit 40; Wherein:
This input circuit 20 has the capacitor C 1 of one positive input terminal+DC, one negative input end-DC and two series connection, C2; The capacitor C 1 of this series connection has a string interlink point V1 between the C2, two capacitor C 1, and the end in addition of the relative series connection node V1 of C2 is connected with this positive input terminal+DC and negative input end-DC respectively;
This full semi-bridge switching circuit 30 comprises a full-bridge switch unit 31, a half-bridge rectification unit 32 and a controller 33; Wherein, this full-bridge switch unit 31 is connected with positive input terminal+DC, the negative input end-DC of aforementioned input circuit 20, mainly formed by first to fourth switch S, 1 ~ S4, and first, second switch S 1, there is a sustained diode 4 at S2 two ends cross-over connection respectively, D3, this first, second switch S 1, S2 and the 3rd, the 4th switch S 3, S4 are paired serial connections and constitute one first output node V2, one second output node V3 respectively;
This half-bridge rectification unit 32 comprises the 3rd, the 4th switch S 3 that shares with full-bridge switch unit 31, the rectifier diode D1 that S4 and two is reverse serial connection, D2, this two rectifier diode D1, D2 is located between two electric capacity of the first output node V2 and this input circuit 20 between the series connection node V1, and two rectifier diode D1, D2 two ends cross-over connection respectively have one to switch switch S 5, S6; And this two diverter switch S5, S6 is in order to the sense of control circuit when positive half cycle and the negative half period;
This controller 33 respectively with aforementioned first to fourth switch S, 1 ~ S4, two diverter switch S5, S6 connects; It can be compared to the input voltage of DC power supply and the crest voltage of civil power AC signal, drives full-bridge switch unit 31 or half-bridge rectification unit 32 according to comparison result.
In the present embodiment, this output circuit 40 has a filter circuit 41, this filter circuit 41 has two inductance L 1, L2, and be connected with the first output node V2, the second output node V3 of this full-bridge switch unit 31 respectively with an end, two inductance L 1, the in addition end of L2 then constitutes AC signal output terminals A C1 respectively, AC2 and being connected with this electric main system 50.
Operation principle about the aforementioned preferred embodiment of the utility model please refer to shown in Figure 2: when civil power string wave voltage (VGrid) at positive half cycle t0 to t1 during less than the input voltage DC/2 of current transformer, make the 3rd switch S 3 and diverter switch S6 conducting, by 32 work of half-bridge rectification unit; As positive half cycle t1 to t2, civil power string wave voltage is during greater than the input voltage DC/2 of current transformer, even the 3rd, second switch S3, the S2 conducting changes by 31 work of full-bridge switch unit.This full semi-bridge switching circuit 30 when positive half cycle output circuit afterflow, make this first, second, the 4th switch S 1, S2, S4 and two diverter switch S5, S6 ends, and makes sustained diode 4 and 3 conductings of the 3rd switch S.
At negative half period t3 to t4, civil power string wave voltage is during less than DC power supply input voltage DC/2, and this controller 33 makes the 4th switch S 4 and diverter switch S5 conducting, and switchback is by 32 work of half-bridge rectification unit; And at negative half period t4 to t5, civil power string wave voltage is greater than DC power supply input voltage DC/2, and controller 33 is to make the 4th, first switch S 4, and the S1 conducting is switched by 31 work of full-bridge switch unit.This full semi-bridge switching circuit 30 makes this first, second, third switch S 1 when the afterflow of negative half period output circuit, S2, and S3 and two diverter switch S5, S6 ends, and makes sustained diode 3 and 4 conductings of the 4th switch S.
If civil power string crest value signal is during less than DC power supply (VInverter) the input voltage DC/2 of current transformer, no matter this full semi-bridge switching circuit 30 is all to be operated with decompression mode by half-bridge rectification unit 32 at positive and negative half cycle, when positive half cycle, be to make the 3rd switch S 3 and diverter switch S6 conducting, then make the 4th switch S 4 and diverter switch S5 conducting during negative half period.
Second preferred embodiment of the present utility model, please refer to shown in Figure 3, its execution mode is roughly identical with last embodiment, difference be in: removed first and second switch S 1 among Fig. 1, the cross-over connection fly-wheel diode of S2, and this output circuit 40 further comprises two sustained diode 3 in Fig. 3, D4 and two diverter switch S7, S8; Wherein, this diverter switch S7 is located between the 3rd switch S 3 and the second output node V3, and another diverter switch S8 is located between this second output node V3 and the 4th switch S 4; And these sustained diode 3 anodes are connected with the first output node V2, and its negative electrode is connected between this diverter switch S7 and the 3rd switch S 3; Another sustained diode 4 anodes are connected between this diverter switch S8 and the 4th switch S 4, and its negative electrode is connected with the first output node V2.
This preferred embodiment operation principle and last embodiment are roughly the same, when civil power string wave voltage at positive half cycle during less than the input voltage DC/2 of current transformer, make the 3rd switch S 3 and two diverter switch S7, the S6 conducting, by 32 work of half-bridge rectification unit, when output circuit 40 afterflows, make the 3rd switch S 3 and diverter switch S6 end, this sustained diode 3 and diverter switch S7 conducting; When civil power string wave voltage during greater than the input voltage DC/2 of current transformer, even the 3rd switch S 3, diverter switch S7 and second switch S2 conducting, change by 31 work of full-bridge switch unit, and output circuit 40 afterflows the 3rd switch S 3 in season and second switch S2 end, this sustained diode 3 and diverter switch S7 conducting;
At negative half period, civil power string wave voltage is during less than DC power supply input voltage DC/2, this controller 33 makes two diverter switch S5, S8 and 4 conductings of the 4th switch S, switchback is by 32 work of half-bridge rectification unit, when output circuit 40 afterflows, make the 4th switch S 4 and diverter switch S5 end, this sustained diode 4 and diverter switch S8 conducting; When civil power string wave voltage greater than DC power supply input voltage DC/2, controller 33 makes the 4th switch S 4, diverter switch S8 and 1 conducting of first switch S, switching is by 31 work of full-bridge switch unit, and output circuit 40 afterflows the 4th switch S 4 in season and first switch S 1 are ended, this sustained diode 4 and diverter switch S8 conducting.
If civil power string crest value signal is during less than the DC power supply input voltage DC/2 of current transformer, no matter this full semi-bridge switching circuit 30 is all to be operated with decompression mode by half-bridge rectification unit 32 at positive and negative half cycle, when positive half cycle, be to make the 3rd switch S 3 and two diverter switch S7, the S6 conducting, then make two diverter switch S5 during negative half period, S8 and 4 conductings of the 4th switch S.
The 3rd preferred embodiment of the present utility model, please refer to shown in Figure 4ly, its essential structure and last embodiment are roughly the same, and this output circuit 40 still further comprises two diverter switch S7, S8 and two sustained diode 3, D4, difference be in: in the present embodiment, two diverter switch S7, S8 respectively with sustained diode 3, the D4 serial connection, wherein, diverter switch S7 is connected with the second output node V3 with respect to the end in addition of tandem node, and the anode of this sustained diode 3 is connected with the first output node V2; Another diverter switch S8 is connected with this first output node V2 with respect to the end in addition of tandem node, and the anode of this sustained diode 4 is connected in the second output node V3.
When civil power string wave voltage at positive half cycle during less than the input voltage DC/2 of current transformer, make the 3rd switch S 3 and diverter switch S6 conducting, by 32 work of half-bridge rectification unit, when output circuit 40 afterflows, make the 3rd switch S 3 and diverter switch S6 end, this sustained diode 3 and diverter switch S7 conducting; When civil power string wave voltage during greater than the input voltage DC/2 of current transformer, even the 3rd switch S 3 and second switch S2 conducting, change by 31 work of full-bridge switch unit, and output circuit 40 afterflows the 3rd switch S 3 in season and second switch S2 end, this sustained diode 3 and diverter switch S7 conducting.
At negative half period, civil power string wave voltage is during less than DC power supply input voltage DC/2, this controller 33 makes diverter switch S5 and 4 conductings of the 4th switch S, switchback is by 32 work of half-bridge rectification unit, when output circuit 40 afterflows, make this diverter switch S5 and the 4th switch S 4 end, this sustained diode 4 and diverter switch S8 conducting; When civil power string wave voltage greater than DC power supply input voltage DC/2, controller 33 makes the 4th switch S 4 and 1 conducting of first switch S, switching is by 31 work of full-bridge switch unit, and output circuit 40 afterflows the 4th switch S 4 in season and first switch S 1 are ended, this sustained diode 4 and diverter switch S8 conducting.
If civil power string crest value signal is during less than the DC power supply input voltage DC/2 of current transformer, no matter this full semi-bridge switching circuit 30 is all to be operated with decompression mode by half-bridge rectification unit 32 at positive and negative half cycle, when positive half cycle, be to make the 3rd switch S 3 and diverter switch S6 conducting, then make diverter switch S5 and 4 conductings of the 4th switch S during negative half period.
See also shown in Figure 5ly, be the 4th preferred embodiment of the present utility model, present embodiment and last embodiment are roughly the same; And in the present embodiment, the diverter switch S7 of this output circuit 40 is located between the 3rd switch S 3 and the second output node V3, and these sustained diode 3 anodes are connected with the first output node V2, and its negative electrode is connected between this diverter switch S7 and the 3rd switch S 3; The end of another diverter switch S8 is connected with this first output node V2, and end is connected with these sustained diode 4 negative electrodes in addition, and these sustained diode 4 anodes are connected in the second output node V3;
When civil power string wave voltage at positive half cycle during less than the input voltage DC/2 of current transformer, make the 3rd switch S 3 and two diverter switch S7, the S6 conducting, by 32 work of half-bridge rectification unit, when output circuit 40 afterflows, make the 3rd switch S 3 and diverter switch S6 end, this sustained diode 3 and diverter switch S7 conducting; When civil power string wave voltage during greater than the input voltage DC/2 of current transformer, even the 3rd switch S 3, diverter switch S7 and second switch S2 conducting, change by 31 work of full-bridge switch unit, and output circuit 40 afterflows the 3rd switch S 3 in season and second switch S2 end, this sustained diode 3 and diverter switch S7 conducting;
At negative half period, civil power string wave voltage is during less than DC power supply input voltage DC/2, this controller 33 makes diverter switch S5 and 4 conductings of the 4th switch S, switchback is by 32 work of half-bridge rectification unit, when output circuit 40 afterflows, make this diverter switch S5 and the 4th switch S 4 end, this sustained diode 4 and diverter switch S8 conducting; When civil power string wave voltage greater than DC power supply input voltage DC/2, controller 33 makes this first switch S 1 and 4 conductings of the 4th switch S, switching is by 31 work of full-bridge switch unit, and output circuit 40 afterflows this first switch S 1 in season and the 4th switch S 4 are ended, this sustained diode 4 and diverter switch S8 conducting.
If civil power string crest value signal is during less than the DC power supply input voltage DC/2 of current transformer, no matter this full semi-bridge switching circuit 30 is all to be operated with decompression mode by half-bridge rectification unit 32 at positive and negative half cycle, when positive half cycle, be to make the 3rd switch S 3 and two diverter switch S7, the S6 conducting then makes diverter switch S5 and 4 conductings of the 4th switch S during negative half period.
Above-described specific embodiment; the purpose of this utility model, technical scheme and beneficial effect are further described; institute is understood that; the above only is specific embodiment of the utility model; and be not used in and limit protection range of the present utility model; all within spirit of the present utility model and principle, any modification of making, be equal to replacement, improvement etc., all should be included within the protection range of the present utility model.
Claims (6)
1. a mixed type direct current/alternating current transformer comprises an input circuit, a full semi-bridge switching circuit; It is characterized in that:
Described input circuit has the electric capacity of a positive input terminal, a negative input end and two series connection; Have a string interlink point between the electric capacity of described series connection, the end in addition of the relative series connection node of two electric capacity is connected with described positive input terminal and negative input end respectively;
Described full semi-bridge switching circuit comprises:
One full-bridge switch unit is connected with the positive and negative end input of described input circuit, mainly is made up of first to fourth switch, and described the first, the 4th switch and second, third switch be serial connection and constitute one first output node and one second output node respectively in pairs;
One half-bridge rectification unit, comprise the 3rd, the 4th switch and two rectifier diodes that share with the full-bridge switch unit, two rectifier diodes are between reverse two electric capacity of being located at first output node and input circuit between the series connection node with connecting, and the two ends of each rectifier diode are cross-over connection one switching switch respectively;
One controller is connected with first to fourth switch, two diverter switches of described full semi-bridge switching circuit respectively.
2. mixed type direct current/alternating current transformer according to claim 1, it is characterized in that, described mixed type direct current/alternating current transformer further comprises an output circuit, described output circuit has a filter circuit, described filter circuit has two inductance, and be connected with first output node, second output node of described full-bridge switch unit respectively with an end, the in addition end of two inductance then constitutes the AC signal output respectively and is connected with described electric main system.
3. mixed type direct current/alternating current transformer according to claim 2 is characterized in that, first, second switch ends in described full-bridge switch unit cross-over connection respectively has a fly-wheel diode.
4. mixed type direct current/alternating current transformer according to claim 2 is characterized in that, described output circuit further comprises two fly-wheel diodes and two diverter switches; Wherein, described diverter switch is located between the 3rd switch and second output node, and another diverter switch is located between described second output node and the 4th switch; Described fly-wheel diode anode is connected with first output node, and the negative electrode of described fly-wheel diode is connected between described diverter switch and the 3rd switch; Another fly-wheel diode anode is connected between another diverter switch and the 4th switch, and the negative electrode of described another fly-wheel diode is connected with first output node.
5. mixed type direct current/alternating current transformer according to claim 2, it is characterized in that, described output circuit further comprises two fly-wheel diodes and two diverter switches, two diverter switches are connected in series with fly-wheel diode respectively, wherein, diverter switch is connected with second output node with respect to the end in addition of tandem node, and the anode of described fly-wheel diode is connected with first output node; Another diverter switch is connected with described first output node with respect to the end in addition of tandem node, and the anode of described fly-wheel diode is connected in second output node.
6. mixed type direct current/alternating current transformer according to claim 2, it is characterized in that, the diverter switch of described output circuit is located between the 3rd switch and second output node, and described fly-wheel diode anode is connected with first output node, and the negative electrode of described fly-wheel diode is connected between described diverter switch and the 3rd switch; One end of another diverter switch is connected with described first output node, and end is connected with described fly-wheel diode negative electrode in addition, and described fly-wheel diode anode is connected in second output node.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320082352 CN203135743U (en) | 2012-12-19 | 2013-02-22 | Hybrid DCAC current transformer |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201220713156 | 2012-12-19 | ||
| CN201220713156.0 | 2012-12-19 | ||
| CN 201320082352 CN203135743U (en) | 2012-12-19 | 2013-02-22 | Hybrid DCAC current transformer |
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| Publication Number | Publication Date |
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| CN203135743U true CN203135743U (en) | 2013-08-14 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 201320082352 Expired - Lifetime CN203135743U (en) | 2012-12-19 | 2013-02-22 | Hybrid DCAC current transformer |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104660044A (en) * | 2014-12-26 | 2015-05-27 | 西安华为技术有限公司 | Switching circuit and method and device for controlling switching circuit |
| CN109286331A (en) * | 2018-12-03 | 2019-01-29 | 湖北英特利电气有限公司 | The three-phase high frequency switch power of wide input voltage range |
-
2013
- 2013-02-22 CN CN 201320082352 patent/CN203135743U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104660044A (en) * | 2014-12-26 | 2015-05-27 | 西安华为技术有限公司 | Switching circuit and method and device for controlling switching circuit |
| CN109286331A (en) * | 2018-12-03 | 2019-01-29 | 湖北英特利电气有限公司 | The three-phase high frequency switch power of wide input voltage range |
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