CN103078544A - Direct current/alternating current converting system - Google Patents
Direct current/alternating current converting system Download PDFInfo
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- CN103078544A CN103078544A CN2013100368979A CN201310036897A CN103078544A CN 103078544 A CN103078544 A CN 103078544A CN 2013100368979 A CN2013100368979 A CN 2013100368979A CN 201310036897 A CN201310036897 A CN 201310036897A CN 103078544 A CN103078544 A CN 103078544A
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Abstract
The invention discloses a direct current/alternating current converting system which is suitable for converting a direct current input source into an alternating current input source. The direct current/alternating current converting system comprises a boosting module, a direct current/alternating current converting module and a feedback module, wherein the boosting module is a staggered BOOST circuit; the staggered BOOST circuit is used for receiving voltage of the direct current input source and outputting direct current voltage required by a rear section; the staggered BOOST circuit operates when direct current voltage cannot meet the requirement of the alternating current output source so as to improve direct current voltage outputted by the boosting module; and the direct current/alternating current converting module is used for receiving voltage outputted by the boosting module and converting the received voltage into the alternating current output source to be outputted. According to the direct current/alternating current converting system disclosed by the invention, the input direct current voltage is adjusted to the voltage required by output and is stable; the loss of the direct current/alternating current converting system during switching is effectively reduced; a first-stage high energy storage capacitor is omitted; and the cost is reduced, the conversion efficiency is increased, and thus the direct current/alternating current converting system is more practical.
Description
Technical field
The present invention relates to a kind of electric conversion system, particularly relate to a kind of AC/DC converting system.
Background technology
Existing technology is applied in the framework of the DC/AC switching device of input voltage on a large scale, and as shown in Figure 1, this AC/DC converting system comprises first order booster circuit, second level DC-DC converter, and third level AC/DC converter.
Wherein first order booster circuit is by the direct current input source, inductance, and transistor switch, diode and electric capacity form.First order booster circuit is to make pulse width modulation and reach to raise to the required voltage swing of output and the effect of voltage stabilizing via transistor switch.
Second level DC-DC converter is transferred in the output of first order booster circuit.It comprises four switching tubes of primary side control circuit control, four switching tubes in voltage transitions dress transformer and the control of secondary side control circuit.
Second level DC-DC converter is to receive the direct voltage source that raised by first order booster circuit and via the conducting of four middle transistor switches of primary side control circuit or close, the magnitude of voltage that first order booster circuit is exported is sent to the primary side of voltage transitions high frequency transformer, and the voltage that receives is sent in the rectifier that is formed by four diodes the filter that again voltage transmission that receives to thereafter inductance and electric capacity is formed and export third level AC/DC converter to via the voltage transitions high frequency transformer.
Then third level AC/DC converter is transferred in the output of second level DC-DC converter.By four transistor switches, inductance, and electric capacity forms.Via the change action of four transistor switches and be converted into alternating-current voltage source by the direct voltage source that the filter that inductance and electric capacity form receives and export load end to.
The use of the DC/AC switching device of input voltage on a large scale in the prior art must raise circuit via the voltage of the first order with the direct voltage source of input and boost to maximum and voltage stabilizing, and the DC-DC converter that then is transferred to the second level is done conversion.Be transferred to third level AC/DC converter via voltage conversion device again, the DC power supply that receives is converted into AC power, the AC power that offered load is required.
Comprehensive the above, in the use of the DC/AC switching device of input voltage on a large scale, following shortcoming is arranged in the prior art:
1. no matter the required interchange output source of output is high voltage or low-voltage, in the booster circuit of the first order, all the input direct-current source must be risen to ceiling voltage.Thus, element just must be under high-tension situation handover operation, therefore will cause the waste of energy.
2. need to be through the conversion of three-level structure because of it, cause loss between power conversion to become large and conversion efficiency is not good.
3. need to adopt two groups of large storage capacitors, cost to improve and be not inconsistent house consideration economically.
Summary of the invention
The present invention seeks to: a kind of new AC/DC converting system is provided, technical problem to be solved is it to be adjusted to input direct voltage meet output required voltage and voltage stabilizing, more tolerance is larger to make simultaneously the scope of input voltage, can effectively reduce the loss of AC/DC converting system when switching, and the use of omitting the large storage capacitor of one-level, reach Cost reduction and improve conversion efficiency, thus more practical.
Technical scheme of the present invention is: a kind of AC/DC converting system, convert the direct current input source to the interchange output source by the AC/DC modular converter, it is characterized in that: it comprises boost module, AC/DC modular converter and feedback module, described boost module i.e. staggered BOOST rises circuit, should rise the DC input voitage that circuit receives input source by staggered BOOST, described AC/DC modular converter receives the output voltage of boost module, and this voltage is converted into the interchange output source that to export, when the direct voltage of input source is enough to supply the alternating current source of output, described staggered BOOST rises circuit and does not work, exchange output source and take when the direct voltage of input source is not enough, described staggered BOOST rises circuit and starts working, thereby improves the direct voltage of being exported by boost module.Described feedback module determines the required magnitude of voltage that provides of boost module according to the output of AC/DC modular converter and the value of preset value.The characteristics that should staggered BOOST rise circuit are, can hold larger electric current, have reduced stress and the loss of components and parts, and the volume of inductance is reduced greatly, make the scope of input voltage wider.
Preferably, described staggered BOOST rises the first switch in the circuit, an end and the direct current input source negative pole end of second switch joins, the other end joins with the first inductance, the second inductance respectively, the end that described the first inductance, the second inductance link to each other with the first switch, second switch is the positive terminal of the first diode in parallel, the second diode respectively, and the positive terminal of the other end and direct current input source joins.
Preferably, the negative pole end that described staggered BOOST rises the first capacitance cathode end in the circuit and the first diode, the second diode joins, and the first electric capacity negative pole end and direct current input source negative pole end join.
Preferably, described AC/DC modular converter comprises the voltage transitions system, the magnitude of voltage that described voltage transitions system decides its secondary side to provide according to the magnitude of voltage of its primary side, described primary side control circuit is connected between described boost module and this primary side, this primary side control circuit has a plurality of switches, and according to the conducting of those switches whether, control and to be transferred to this primary side by the voltage that boost module receives, described secondary side circuit is connected to this secondary side, and the voltage transitions that will receive from this secondary side is the interchange output source that will export.Its characteristics are by described AC/DC modular converter voltage source directly to be converted to current source output.Described voltage transitions system can be high frequency transformer.
Preferably, described primary side control circuit comprises four switches, and they are connected in parallel on two outputs of described boost module after the series connection first in twos.
Preferably, described secondary side rectification circuit comprises full-bridge rectifier or half bridge rectifier, also comprises some transistor switches.
Preferably, described feedback module comprises controller, described controller comprises error compensator, comparator and pulse width modulation baud generator, described error compensator is used for the output of more described AC/DC modular converter and its preset value, the output error compensating signal, described comparator is used for relatively sawtooth waveforms and this error compensating signal, the output comparison signal, described pulse width modulation baud generator produces output wave according to this comparison signal and does pulse width modulation to control in the described primary side control circuit switch.
Preferably, described switch can be transistor switch.
Advantage of the present invention is:
1. AC/DC converting system of the present invention can effectively reduce the loss of AC/DC modular converter when switching, and the use of omitting the large storage capacitor of one-level, thereby increases efficient, Cost reduction.
2. the present invention does not need the input direct-current source to be risen to ceiling voltage at every turn, meets output required voltage and voltage stabilizing but input direct voltage is adjusted to, and makes the wider current capacity of input voltage range larger, thereby more is suitable for practicality.
Description of drawings
The invention will be further described below in conjunction with drawings and Examples:
Fig. 1 is a kind of AC/DC converting system of prior art;
Fig. 2 is the first embodiment of the present invention;
Fig. 3 is the second embodiment of the present invention;
Fig. 4 is the switching waveform figure of the 7th transistor switch Q7, the 8th transistor switch Q8 in output voltage and the secondary side control circuit among the first embodiment of the present invention;
Fig. 5 is the calcspar of feedback module among the present invention;
Fig. 6 is the interchangeable circuit of secondary side control circuit in the AC/DC converting system of the present invention;
Fig. 7 is the interchangeable circuit of primary side control circuit in the AC/DC converting system of the present invention.
Wherein: Q1, the first switch; Q2, second switch; L1, the first inductance; L2, the second inductance; D1, the first diode; D2, the second diode; C1, the first electric capacity; T, voltage transitions system; Q7, the 7th transistor switch; Q8, the 8th transistor switch;
Embodiment
Embodiment: as Fig. 2, shown in Figure 3 be two kinds of effect preferred embodiments of this invention, the boost module that has marked the AC/DC converting system among the figure is connected each element and is connected with the AC/DC modular converter.
As shown in Figure 2, boost module comprises the first switch Q1, second switch Q2, the first inductance L 1, the second inductance L 2, the first diode D1, the second diode D2, the first capacitor C 1 and direct current input source.An end and the direct current input source negative pole end of described the first switch Q1, second switch Q2 join, the other end joins with the first inductance L 1, the second inductance L 2 respectively, the end that described the first inductance L 1, the second inductance L 2 link to each other with the first switch Q1, second switch Q2 is the positive terminal of the first diode D1 in parallel, the second diode D2 respectively, and the positive terminal of the other end and direct current input source joins.The negative pole end of described the first capacitor C 1 positive terminal and the first diode D1, the second diode D2 joins, and the first capacitor C 1 negative pole end and direct current input source negative pole end join.
As shown in Figure 2, the AC/DC modular converter comprises the T of voltage transitions system, and the primary side control circuit of the described voltage transitions T of system comprises four transistor switch Q3, Q4, Q5, Q6, and they are connected in parallel on two outputs of described boost module after the series connection first in twos.The secondary side circuit comprises the rectifier that is comprised of four diode D3, D4, D5, D6, an inductance and the filter that electric capacity forms, and the 7th transistor switch Q7, the 8th transistor switch Q8, via the change action of described two transistor switches direct voltage is converted into alternating-current voltage source and exports load end to.
The switching waveform of the 7th transistor switch Q7, the 8th transistor switch Q8 as shown in Figure 4 in output voltage and the secondary side control circuit.When the alternating voltage of output is positive half cycle, the 7th transistor switch Q7 conducting.When the alternating voltage of output when being negative half period, the 8th transistor switch Q8 conducting, and the electric voltage frequency of the switching frequency of the 7th transistor switch Q7 and the 8th transistor switch Q8 and output is identical.And through the filter that is formed by inductance and electric capacity, the AC power that output loading is required.
The operation principle of the present embodiment is as follows:
Staggered BOOST rises the not enough interchange of the direct voltage work that output source takes that circuit is exported at boost module, input direct voltage is adjusted to meets the output required voltage, the voltage that boost module is exported is to the AC/DC modular converter, the AC/DC modular converter receives by boost module institute output voltage, and the direct voltage that conversion receives is the interchange output source that will export.When input direct voltage was enough to supply the alternating current source of output, staggered BOOST rose circuit and does not work.
The calcspar of the present embodiment feedback module as shown in Figure 5, the controller of described feedback module comprises error compensator, comparator and pulse width modulation baud generator, wherein, error compensator is feedback signal and the reference signal of comparison AC/DC modular converter, and the output error compensating signal is to comparator input terminal.And comparator is comparison sawtooth waveforms and error compensating signal, and the output comparison signal is to the pulse width modulation baud generator.
In the present embodiment, when the direct voltage of input is enough to the required voltage of supply output terminal, staggered BOOST rises the first switch Q1 and the second switch Q2 in the circuit, keeps the state of not conducting according to feedback signal, and this moment, the direct voltage source of input was directly transported in the AC/DC modular converter.And relatively behind the feedback current or voltage signal and reference signal of AC/DC modular converter, the output error compensating signal is to the input of comparator via the error compensator of the controller in the feedback module.
Comparator is comparison sawtooth waveforms and error compensating signal, to export comparison signal to the pulse width modulation baud generator.This pulse width modulation baud generator produces output wave according to comparison signal and does pulse width modulation with transistor switch Q3, Q4, Q5 and Q6 in the control primary side control circuit.
When the direct voltage of input was not enough to the required alternating current source of supply output terminal, staggered BOOST rose circuit and starts working, and voltage is risen to needed voltage, and the control mode of its deutomerite is same as above.
The replaceable one-tenth AC/DC converter of the circuit of the primary side control circuit in above-described embodiment also can be reached similar effect, as shown in Figure 7.
The replaceable one-tenth of circuit of the secondary side control circuit in above-described embodiment such as Fig. 3 or circuit shown in Figure 6.
Below only be concrete exemplary applications of the present invention, protection scope of the present invention is not constituted any limitation.In addition to the implementation, the present invention can also have other execution modes.All employings are equal to the technical scheme of replacement or equivalent transformation formation, all drop within the present invention's scope required for protection.
Claims (8)
1. AC/DC converting system, convert the direct current input source to the interchange output source by the AC/DC modular converter, it is characterized in that: it comprises boost module, AC/DC modular converter and feedback module, described boost module i.e. staggered BOOST rises circuit, should rise the DC input voitage that circuit receives input source by staggered BOOST, described AC/DC modular converter receives the output voltage of boost module, and this voltage is converted into the interchange output source that to export, when the direct voltage of input source is enough to supply the alternating current source of output, described staggered BOOST rises circuit and does not work, exchange output source and take when the direct voltage of input source is not enough, described staggered BOOST rises circuit and starts working, thereby improve the direct voltage of being exported by boost module, described feedback module determines the required magnitude of voltage that provides of boost module according to the output of AC/DC modular converter and the value of preset value.
2. a kind of AC/DC converting system according to claim 1, it is characterized in that: described staggered BOOST rises the first switch (Q1) in the circuit, an end and the direct current input source negative pole end of second switch (Q2) joins, the other end joins with the first inductance (L1), the second inductance (L2) respectively, the end that described the first inductance (L1), the second inductance (L2) link to each other with the first switch (Q1), second switch (Q2) is the positive terminal of the first diode in parallel (D1), the second diode (D2) respectively, and the positive terminal of the other end and direct current input source joins.
3. a kind of AC/DC converting system according to claim 2, it is characterized in that: the negative pole end that described staggered BOOST rises the first electric capacity (C1) positive terminal in the circuit and the first diode (D1), the second diode (D2) joins, and the first electric capacity (C1) negative pole end and direct current input source negative pole end join.
4. a kind of AC/DC converting system according to claim 1, it is characterized in that: described AC/DC modular converter comprises voltage transitions system (T), the magnitude of voltage that described voltage transitions system (T) decides its secondary side to provide according to the magnitude of voltage of its primary side, described primary side control circuit is connected between described boost module and this primary side, this primary side control circuit has a plurality of switches, and according to the conducting of those switches whether, control and to be transferred to this primary side by the voltage that boost module receives, described secondary side circuit is connected to this secondary side, and the voltage transitions that will receive from this secondary side is the interchange output source that will export.
5. a kind of AC/DC converting system according to claim 4, it is characterized in that: described primary side control circuit comprises four switches, they are connected in parallel on two outputs of described boost module after the series connection first in twos.
6. a kind of AC/DC converting system according to claim 4, it is characterized in that: described secondary side rectification circuit comprises full-bridge rectifier or half bridge rectifier, also comprises some transistor switches.
7. a kind of AC/DC converting system according to claim 1, it is characterized in that: described feedback module comprises controller, described controller comprises error compensator, comparator and pulse width modulation baud generator, described error compensator is used for the output of more described AC/DC modular converter and its preset value, the output error compensating signal, described comparator is used for relatively sawtooth waveforms and this error compensating signal, the output comparison signal, described pulse width modulation baud generator produces output wave according to this comparison signal and does pulse width modulation to control in the described primary side control circuit switch.
8. according to claim 2 or 4 or 5 described a kind of AC/DC converting systems, it is characterized in that: described switch can be transistor switch.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013100368979A CN103078544A (en) | 2013-01-31 | 2013-01-31 | Direct current/alternating current converting system |
| JP2013175272A JP2014150706A (en) | 2013-01-31 | 2013-08-27 | DC/AC conversion system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013100368979A CN103078544A (en) | 2013-01-31 | 2013-01-31 | Direct current/alternating current converting system |
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| Publication Number | Publication Date |
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| CN103078544A true CN103078544A (en) | 2013-05-01 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2013100368979A Pending CN103078544A (en) | 2013-01-31 | 2013-01-31 | Direct current/alternating current converting system |
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|---|---|
| JP (1) | JP2014150706A (en) |
| CN (1) | CN103078544A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108111032A (en) * | 2016-11-25 | 2018-06-01 | 台达电子工业股份有限公司 | Power conversion unit and power converting method |
| CN111654183A (en) * | 2020-06-12 | 2020-09-11 | 深圳英飞源技术有限公司 | DC-DC conversion device and control method thereof |
| CN112583268A (en) * | 2020-12-21 | 2021-03-30 | 上海交通大学 | Modular multilevel DC converter |
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| US7009852B2 (en) * | 2003-07-30 | 2006-03-07 | Delta Electronics Inc. | DC-DC converter circuits and method for reducing DC bus capacitor current |
| CN102118115A (en) * | 2010-01-05 | 2011-07-06 | 台达电子工业股份有限公司 | Direct current-alternating current conversion circuit within range of wide input voltage value |
| CN203135744U (en) * | 2013-01-31 | 2013-08-14 | 苏州欧姆尼克新能源科技有限公司 | Direct current / alternating current conversion system |
-
2013
- 2013-01-31 CN CN2013100368979A patent/CN103078544A/en active Pending
- 2013-08-27 JP JP2013175272A patent/JP2014150706A/en active Pending
Patent Citations (3)
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| US7009852B2 (en) * | 2003-07-30 | 2006-03-07 | Delta Electronics Inc. | DC-DC converter circuits and method for reducing DC bus capacitor current |
| CN102118115A (en) * | 2010-01-05 | 2011-07-06 | 台达电子工业股份有限公司 | Direct current-alternating current conversion circuit within range of wide input voltage value |
| CN203135744U (en) * | 2013-01-31 | 2013-08-14 | 苏州欧姆尼克新能源科技有限公司 | Direct current / alternating current conversion system |
Non-Patent Citations (1)
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| 王翔: "6kW单相光伏并网系统的研制", 《中国优秀硕士学位论文全文数据库工程科技Ⅱ辑》, 30 October 2012 (2012-10-30) * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108111032A (en) * | 2016-11-25 | 2018-06-01 | 台达电子工业股份有限公司 | Power conversion unit and power converting method |
| CN111654183A (en) * | 2020-06-12 | 2020-09-11 | 深圳英飞源技术有限公司 | DC-DC conversion device and control method thereof |
| CN111654183B (en) * | 2020-06-12 | 2021-10-29 | 深圳英飞源技术有限公司 | DC-DC conversion device and control method thereof |
| CN112583268A (en) * | 2020-12-21 | 2021-03-30 | 上海交通大学 | Modular multilevel DC converter |
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| Publication number | Publication date |
|---|---|
| JP2014150706A (en) | 2014-08-21 |
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Application publication date: 20130501 |