CN1141779C - Integrated multifunctional DC converter - Google Patents
Integrated multifunctional DC converter Download PDFInfo
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- CN1141779C CN1141779C CNB001347411A CN00134741A CN1141779C CN 1141779 C CN1141779 C CN 1141779C CN B001347411 A CNB001347411 A CN B001347411A CN 00134741 A CN00134741 A CN 00134741A CN 1141779 C CN1141779 C CN 1141779C
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Abstract
The present invention relates to a multifunctional integral direct current converter which comprises input capacitors, a direct current-alternating current conversion circuit, a transformer, a rectification circuit and a filter capacitor, wherein the direct current-alternating current conversion circuit comprises a full-bridge switching component set; the two input capacitors are respectively connected with a first bridge arm and a secondary bridge arm of the full-bridge switching component set in parallel. Two end points of a first input voltage conversion switch are respectively connected to the secondary bridge arm. The first input voltage conversion point is connected to a first input capacitor. Two end points of a secondary input voltage conversion switch are respectively connected to the first bridge arm, and the conversion point is connected to the secondary input capacitor.
Description
The present invention relates to a kind of device of realizing direct current energy to conversion between the direct current energy, relate in particular to a kind of integrated multifunctional DC converter.
Fig. 1 is the soft switch DC of the existing a kind of full-bridge phase shifting formula circuit structure diagram of rheology parallel operation always.Direct voltage on the input capacitor C11 becomes the high frequency square wave alternating voltage to deliver to transformer Tr through switching device S11～S14 switch change-over, the outlet side of transformer Tr is exported the square wave alternating-current voltage of two groups of identical amplitudes, reaches the filter circuit filtering of being made up of inductor Lo and capacitors in series through rectifier diode D11, D12 rectification and obtains output dc voltage.In the converter of this structure, each comfortable 50% duty ratio square-wave signal control complementary switch work down of upper and lower two switching device S11 of first brachium pontis and upper and lower two switching device S13 of the S12 and second brachium pontis and S14.And being the phase difference of the control signal of the control signal by changing first brachium pontis and second brachium pontis, the adjusting of output voltage reaches, and utilize the energy storage among the equivalent inductance Lk in the transformer Tr input loop to realize the soft open-minded of switching device S11～S14, to improve the operating efficiency of converter.
Fig. 2 is the circuit structure diagram of existing a kind of asymmetrical half-bridge DC-DC converter.Direct voltage on the input capacitor C21 is up and down two switching device S21 and the work of S22 complementary switch in brachium pontis, output high frequency square wave alternating current, this output makes the input side of transformer Tr obtain square wave alternating-current voltage through block capacitor Cb filtering direct current part.Circuit of transformer Tr outlet side (comprising the filter circuit that rectifier diode D21, D22 and inductor Lo and capacitor C3 form) and operation principle and Fig. 1 prior art are similar.The square-wave pulse time of the control signal by changing switching device S21 or S22 in Fig. 2 prior art changes output end voltage, and utilize that the energy storage of the equivalent inductance Lk in transformer Tr input loop realizes switching device S21 and S22 softly open work.
Fig. 3 is the circuit structure diagram of existing a kind of full bridge structure series parallel resonance DC-DC converter.Direct voltage on the input capacitor C31 is transformed into square wave alternating-current voltage through switching device S31～S34.The series resonant tank that constitutes via series resonance inductor Ls and series resonance capacitor Cs and constitute shunt-resonant circuit resonance by the input magnetizing inductance of parallel resonance capacitor Cp and transformer Tr and obtain the input terminal voltage of sinusoidal voltage again as transformer Tr.Circuit of the output of transformer Tr (comprising the filter circuit that rectifier diode D31, D32 and inductor Lo and capacitor C3 form) and operation principle and Fig. 1 are similar.Thereby the adjusting of output voltage is to change transformer Tr input terminal voltage by the switch operating frequency that changes switching device S31～S34 to realize among Fig. 3.
Existing DC-DC converter is applicable to that all input direct voltage and output dc voltage all change the smaller applications occasion relatively among Fig. 1 to Fig. 3.And the service behaviour of converter and conversion efficiency are along with the rising of the reduction of output voltage and input voltage and descend.Therefore, when practical application related to different input voltages or output voltage condition, existing converter must carry out special design at obstructed service condition and just can reach.
Therefore, the object of the present invention is to provide a kind of integrated multifunctional DC converter with multiple input and output voltage mapping function, thereby realize the multifunction and the dexterityization of DC converter, reach and reduce the product variety specification, optimize product quality and further reduce product cost.
For example, in the communications field, the DC converting that DC converter commonly used is 48V to the DC converting of 24V and 24V to 48V.Be to realize corresponding mapping function respectively at present by two kinds of different converting means.The objective of the invention is to realize that a kind of new converting means can be directly used in above-mentioned two kinds of application scenarios.
Moreover, in present application, also often have and take off in the bosom of different input voltages, obtain the requirement of identical output voltage.For example, input voltage has two kinds of 100V and 200V respectively, all needs to obtain identical output voltage, as 24V.
Therefore, according to above-mentioned purpose of the present invention, the invention provides a kind of integrated multifunctional DC converter, it comprises:
Input capacitor is used to provide direct voltage;
The DC-AC translation circuit links to each other with described input capacitor, and the direct voltage that described input capacitor is provided converts high-frequency ac voltage to;
Transformer links to each other with described DC-AC translation circuit, and described high-frequency ac voltage is carried out voltage isolation and transformation;
Rectification circuit links to each other with described transformer output, and the high-frequency ac voltage through transformation that described transformer is exported is rectified into direct voltage; And
Filtering capacitor links to each other with described rectification circuit;
The invention is characterized in, described DC-AC translation circuit comprises the full-bridge switch set of devices, described integrated multifunctional DC converter has two input capacitors, first input capacitor is in parallel with first brachium pontis of described full-bridge switch set of devices, and second input capacitor is in parallel with second brachium pontis of described full-bridge switch set of devices; Described integrated multifunctional DC converter also comprises two input direct voltage change over switches, two end points on the first input voltage change over switch are connected respectively on the two ends of described second brachium pontis, and the transfer point of first input voltage switch is connected on described first input capacitance; Two end points on the second input voltage change over switch are connected respectively on the two ends of described first brachium pontis, and the transfer point of the second input voltage change over switch is connected on described second input capacitance.
Describe preferred embodiment of the present invention in detail below in conjunction with accompanying drawing, above and other objects of the present invention, advantage and effect will become more clear by following description.In the accompanying drawing:
Fig. 1-Fig. 3 shows three kinds of structures of the DC converter of prior art;
Fig. 4 shows the circuit structure diagram of integrated multifunctional DC converter of the present invention;
Fig. 5 is used to explain the operation principle of DC converter shown in Figure 4;
Fig. 6 shows the another kind of circuit structure diagram of integrated multifunctional DC converter of the present invention;
Fig. 7 is used to explain the operation principle of DC converter shown in Figure 6;
Fig. 8 shows another circuit structure diagram of multi-functional integration open form DC converter of the present invention.
As shown in Figure 4, the resonant circuit be made up of input capacitor C1, full-bridge switch set of devices S1-S4, resonant capacitor Cs and series resonance inductor Ls of integrated multifunctional DC converter of the present invention, transformer Tr, the output rectification circuit and the filtering capacitor C3 that are made of rectifier diode D1-D4 form.Input capacitor C1 is connected with full-bridge switch set of devices S1-S4, and full-bridge switch set of devices S1-S4 is the same with full-bridge switch set of devices in traditional DC converter, alternate conduction and shutoff.Thereby will convert high-frequency ac voltage to from the direct voltage that input capacitor C1 obtains.Full-bridge switch set of devices S1-S4 is connected with the capacitor Cs resonant circuit that series connection constitutes with inductor Ls, constitutes the DC-AC translation circuit.Wherein series resonance inductor Ls can be incorporated among the transformer Tr.
Transformer Tr carries out electrical isolation and transformation with the alternating voltage of DC-AC translation circuit output, and the ratio of transformation can be decided as required.The output rectification circuit that links to each other with the output of transformer Tr is made of with the full-bridge form four rectifier diode D1-D4.Sm among Fig. 4 is the output voltage change over switch, and the end of this change over switch Sm is connected on the centre cap of transformer Tr, and the other end is connected on the common anode tie point of full-bridge rectification diode.The transfer point of change over switch Sm links to each other with filtering capacitor C3.And the common cathode tie point of full-bridge rectification diode is connected to the other end of filtering capacitor C3.
The operation principle of this full bridge rectifier is as follows: the upper and lower switching device S1 of first brachium pontis of full-bridge switch set of devices and S2 suspension control signal separately control and complementary turn-on and turn-off.The upper and lower switching device S3 of second brachium pontis and S4 also are subjected to corresponding signal control and complementary turn-on and turn-off (turn-on and turn-off of control switch set of devices about how all are known technologies, therefore, are not described in detail at this).The direct voltage of input capacitor C1 is through switching device S1～S4 conversion, between the mid point B1 of the mid point A1 of first brachium pontis of full-bridge switch set of devices and second brachium pontis, obtain the high frequency square wave alternating voltage, this high frequency square wave alternating voltage is applied to by series resonance capacitor Cs, the series resonant tank that the input side winding of transformer Tr and series resonance inductor Ls constitute produces series resonance and obtain the sine wave AC electric current in the input side winding of transformer Tr.The sine wave alternating current transformer Tr that flows through is sent in upper and lower two windings of transformer outlet side.According to the residing position of output change-over switch Sm, electric current on the transformer outlet side can pass through rectifier diode element D1 and D2 (when output change-over switch Sm is in the A position) or D1～D4 (when output conversion beginning Sm is in the B position) and be sent on the output capacitor C3, obtains corresponding VD after capacitor C3 filtering.When change over switch Sm is connected to the A point (as Fig. 5 A), output dc voltage is that the voltage on upper and lower two identical windings of transformer Tr outlet side obtains through rectifier diode D1 and D2 rectification respectively.Therefore amplitude of output voltage is corresponding to the voltage amplitude of upper and lower two windings of transformer Tr outlet side.When change over switch is connected to the B point (shown in Fig. 5 B), output dc voltage is that upper and lower two identical windings in series stack of transformer Tr outlet side is after obtain after over commutation diode D1, D4 and D2, the D3 rectification.Therefore this moment, amplitude of output voltage was corresponding to the voltage sum on upper and lower two windings of transformer Tr outlet side.Therefore output dc voltage was change over switch Sm half of output dc voltage when being connected to the B point when change over switch Sm was connected to the A point.Output dc voltage when in other words, change over switch Sm is connected to the B point is the twice of change over switch Sm when being connected to the A point.Therefore, can obtain two kinds of different VD (as 24V and the 48V direct voltage of in communication power supply, using usually) by the link position that changes change over switch Sm and can obviously not influence the service behaviour of circuit.
Embodiment shown in Figure 4 is the function that reaches voltage of transformation by the circuit structure of the output of conversion DC converter.Fig. 6 shows an alternative embodiment of the invention of knowing clearly.In this embodiment, be the function that reaches voltage of transformation by the circuit structure of importation of conversion DC converter.
As shown in Figure 6, in the present embodiment, have two input capacitor C1A and C1B, first brachium pontis of the first input capacitor C1A and full-bridge switch set of devices (be connected in series constitute by switching device S1 and S2) parallel connection, second brachium pontis of the second input capacitor C1B and full-bridge switch set of devices (be connected in series constitute by switching device S3 and S4) parallel connection.The DC converter of present embodiment also comprises two input voltage change over switch Sm1 and Sm2.Two end points of the first input voltage change over switch Sm1 are connected respectively on the two ends of second brachium pontis that is made of switching device S3 and S4 serial connection, and the transfer point of the first input voltage change over switch Sm1 is connected on the first input capacitor C1A; Two end points of the second input voltage change over switch Sm2 are connected respectively on the two ends of first brachium pontis that is made of switching device S1 and S2 serial connection, and the transfer point of the second input voltage change over switch Sm2 is connected on the second input capacitor C1B.Other circuit structure is identical with traditional DC converter shown in Figure 1.
The operation principle of DC converter shown in Figure 6 is as follows: when the transfer point of the first and second input voltage change over switch Sm1 and Sm2 is arranged in the position of Fig. 6 E1 and F2, the second input capacitor C1B is in fact in parallel with the first input capacitor C1A, and its circuit structure can be drawn as the circuit shown in Fig. 7 A.As can be seen, circuit after simplifying is the same with traditional circuit shown in Figure 1, therefore, its operation principle too, the output voltage amplitude between the mid point A1 of first brachium pontis and the mid point B1 of second brachium pontis equates with the input direct voltage amplitude U of the first input capacitor C1A.
When the transfer point of the first and second input voltage change over switch Sm1 and Sm2 was arranged in the position of Fig. 6 F1 and E2, the second input capacitor C1B connected with capacitor C1A, and its circuit structure can be drawn as the circuit shown in Fig. 7 B.As can be seen, the first input capacitor C1A provides voltage to first brachium pontis (switching device S1 and S2), and the second input capacitor C1B provides voltage to second brachium pontis (switching device S3 and S4).Because the first and second input capacitor C1A and C1B serial connection, so the voltage on the first and second electric capacity input capacitor C1A and the C1B is input direct voltage amplitude U half, i.e. U/2.Therefore, the output voltage amplitude between the mid point A1 of first brachium pontis and the mid point B1 of second brachium pontis equates with voltage on the first input capacitor C1A or the second input capacitor C1B, i.e. U/2.Like this, can make this DC converter be applicable to two kinds of different input DC condition by the structure that changes input circuit, and can obviously not change the service behaviour of circuit.
As mentioned above, embodiment shown in Figure 4 is the function that reaches translation circuit by the output circuit structure conversion of conversion DC converter, and embodiment shown in Figure 6 is the function that reaches translation circuit by the input circuit structure of conversion DC converter.In a new embodiment, can combine the output circuit structure of Fig. 4 with input circuit structure shown in Figure 6, its concrete circuit structure as shown in Figure 8 can be with reference to the description of Fig. 4 and Fig. 6 for its operation principle.
Describe each preferred embodiment of the present invention above in detail.But should be appreciated that above-mentioned these are not limitation of the scope of the invention.For the those skilled in the art in present technique field, can under the situation that does not break away from spirit of the present invention, make many variations and modification.Therefore, scope of the present invention should be decided by appended claims.
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Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB001347411A CN1141779C (en) | 2000-12-01 | 2000-12-01 | Integrated multifunctional DC converter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB001347411A CN1141779C (en) | 2000-12-01 | 2000-12-01 | Integrated multifunctional DC converter |
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| CN1355593A CN1355593A (en) | 2002-06-26 |
| CN1141779C true CN1141779C (en) | 2004-03-10 |
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| CNB001347411A Expired - Lifetime CN1141779C (en) | 2000-12-01 | 2000-12-01 | Integrated multifunctional DC converter |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP5914984B2 (en) * | 2011-05-02 | 2016-05-11 | サンケン電気株式会社 | DC converter |
| CN102231599B (en) * | 2011-06-30 | 2013-10-02 | 南京航空航天大学 | Four-port direct-current converter and control method thereof |
| CN102769377B (en) * | 2012-07-10 | 2014-07-16 | 浙江大学 | Non-isolated variable flow topological structure based on phase shift control and application thereof |
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