CN203135744U - Direct current / alternating current conversion system - Google Patents
Direct current / alternating current conversion system Download PDFInfo
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- CN203135744U CN203135744U CN 201320054262 CN201320054262U CN203135744U CN 203135744 U CN203135744 U CN 203135744U CN 201320054262 CN201320054262 CN 201320054262 CN 201320054262 U CN201320054262 U CN 201320054262U CN 203135744 U CN203135744 U CN 203135744U
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Abstract
The utility model discloses a DC / AC conversion system suitable for converting direct current input source into alternating current output source. The DC / AC conversion system comprises a boost module, a DC / AC conversion module and a feedback module. The boost module refers to an interlace BOOST circuit, which receives voltage of the DC input source and outputs DC voltage required by a subsequent section; and the interlace BOOST circuit works when the DC voltage cannot satisfy the requirement of the AC output source, in order to increase the DC voltage output by the boost module. The DC / AC conversion module receives the voltage output by the boost module and converts the received voltage into AC output source to be output. The utility model can adjust input DC voltage into voltage required for output, stabilize the voltage, effectively reduce switching loss of the DC / AC conversion system and omit a first order large energy-storage capacitance to lower the cost and increase conversion efficiency, so that the conversion system is more practical.
Description
Technical field
The utility model relates to a kind of electric conversion system, particularly relates 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 are formed.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 of being formed by four diodes via the voltage transitions high frequency transformer, again the filter that the voltage transmission that receives to thereafter inductance and electric capacity is formed and export third level AC/DC converter to.
Then third level AC/DC converter is transferred in the output of second level DC-DC converter.Be by four transistor switches, inductance, and electric capacity is formed.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 are formed 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, is transferred to partial DC-DC converter then and does 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 DC 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 be through the conversion of three-level structure because of it, cause loss between power conversion to become big and conversion efficiency is not good.
3. need to adopt two groups of big storage capacitors, cost to improve and be not inconsistent house consideration economically.
Summary of the invention
The utility model purpose is: 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 bigger to make the scope of input voltage simultaneously, can effectively reduce the loss of AC/DC converting system when switching, and the use of omitting the big storage capacitor of one-level, reach and reduce cost and improve conversion efficiency, thus more practical.
The technical solution of the utility model 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 bigger 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 wideer.
Preferably, described staggered BOOST rises 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 first inductance, second inductance respectively, the end that described first inductance, second inductance link to each other with first switch, second switch is the positive terminal of first diode in parallel, 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 first diode, 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 earlier 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.
The utility model has the advantages that:
1. the utility model AC/DC converting system can effectively reduce the loss of AC/DC modular converter when switching, and the use of omitting the big storage capacitor of one-level, thereby increases efficient, minimizing cost.
2. the utility model does not need all to import DC source at every turn and rises to ceiling voltage, meets output required voltage and voltage stabilizing but input direct voltage is adjusted to, and makes the wideer current capacity of input voltage range bigger, thereby is suitable for practicality more.
Description of drawings
Below in conjunction with drawings and Examples the utility model is further described:
Fig. 1 is a kind of AC/DC converting system of prior art;
Fig. 2 is first kind of embodiment of the present utility model;
Fig. 3 is second kind of embodiment of the present utility model;
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 first kind of embodiment of the present utility model;
Fig. 5 is the calcspar of feedback module in the utility model;
Fig. 6 is the interchangeable circuit of secondary side control circuit in the utility model AC/DC converting system;
Fig. 7 is the interchangeable circuit of primary side control circuit in the utility model AC/DC converting system.
Wherein: Q1, first switch; Q2, second switch; L1, first inductance; L2, second inductance; D1, first diode; D2, second diode; C1, 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 utility model, marked the boost module of AC/DC converting system and each element of AC/DC modular converter among the figure and be connected.
As shown in Figure 2, boost module comprises the first switch Q1, second switch Q2, first inductance L 1, second inductance L, 2, the first diode D1, the second diode D2, first capacitor C 1 and direct current input source.An end and the direct current input source negative pole end of the described first switch Q1, second switch Q2 join, the other end joins with first inductance L 1, second inductance L 2 respectively, the end that described first inductance L 1, 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 first capacitor C, 1 positive terminal and the first diode D1, the second diode D2 joins, and 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 earlier in twos.The secondary side circuit comprises the rectifier of being made up of four diode D3, D4, D5, D6, an inductance and the filter that electric capacity is formed, 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 of being formed by inductance and electric capacity, the AC power that output loading is required.
The operation principle of 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.
Be the calcspar of 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 utility model, protection range of the present utility model is not constituted any limitation.In addition to the implementation, the utility model can also have other execution modes.All employings are equal to the technical scheme of replacement or equivalent transformation formation, all drop within the utility model 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 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 first inductance (L1), second inductance (L2) respectively, the end that described first inductance (L1), second inductance (L2) link to each other with first switch (Q1), second switch (Q2) is the positive terminal of first diode in parallel (D1), 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 first electric capacity (C1) positive terminal in the circuit and first diode (D1), second diode (D2) joins, and 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 earlier 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 4, 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 (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320054262 CN203135744U (en) | 2013-01-31 | 2013-01-31 | Direct current / alternating current conversion system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320054262 CN203135744U (en) | 2013-01-31 | 2013-01-31 | Direct current / alternating current conversion system |
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| Publication Number | Publication Date |
|---|---|
| CN203135744U true CN203135744U (en) | 2013-08-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320054262 Expired - Fee Related CN203135744U (en) | 2013-01-31 | 2013-01-31 | Direct current / alternating current conversion system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103078544A (en) * | 2013-01-31 | 2013-05-01 | 苏州欧姆尼克新能源科技有限公司 | Direct current/alternating current converting system |
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2013
- 2013-01-31 CN CN 201320054262 patent/CN203135744U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103078544A (en) * | 2013-01-31 | 2013-05-01 | 苏州欧姆尼克新能源科技有限公司 | Direct current/alternating current converting system |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130814 Termination date: 20210131 |
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| CF01 | Termination of patent right due to non-payment of annual fee |