CN201830143U - Modified three-level half-bridge phase-shift zero-voltage transformer - Google Patents
Modified three-level half-bridge phase-shift zero-voltage transformer Download PDFInfo
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- CN201830143U CN201830143U CN2010205521587U CN201020552158U CN201830143U CN 201830143 U CN201830143 U CN 201830143U CN 2010205521587 U CN2010205521587 U CN 2010205521587U CN 201020552158 U CN201020552158 U CN 201020552158U CN 201830143 U CN201830143 U CN 201830143U
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Abstract
The utility model provides a modified three-level half-bridge phase-shift zero-voltage transformer comprising two dividing capacitors (C5 and C6), two clamping diodes (D5 and D6), an upper switch bridge arm, a lower switch bridge arm, a transformer (T1), an output rectifier and filter circuit, a load R1 and an auxiliary branch; one end of a first additional capacitor (C7) is connected with the upper bridge arm branch; the other end of the first additional capacitor (C7) is connected with a second additional capacitor (C7a); the other end of the second additional capacitor (C7a) is connected with the lower bridge arm branch; one end of an additional inductor (L1) is connected with the other end of the primary edge of the transformer (T1); and the other end of the additional inductor (L1) is connected with a middle node between the first additional capacitor (C7) and a second additional capacitor (C7a). The modified three-level half-bridge phase-shift zero-voltage transformer has the advantages of effectively improving zero voltage conditions of the lagging tube, improving energy conversion efficiency, reinforcing reliability, reducing switch-on loss and reducing duty ratio.
Description
Technical field
The utility model relates to the great-power switching voltage regulator field, especially a kind of tri-level half-bridge phase shift no-voltage equipment.
Background technology
Tri-level half-bridge phase shift zero voltage switch converter has kept the constant frequency control of full-bridge phase shifting zero voltage switch converter, the advantage of zero voltage switch, the switching tube requirement of withstand voltage is reduced by half, be particularly suitable for being applied to the big or middle power DC/DC conversion occasion of high pressure input, but the defective of traditional full-bridge phase shifting zero voltage switch converter exists too at tri-level half-bridge phase shift zero voltage switch converter, and it mainly shows:
1) as shown in Figure 1, during underloading, resonant inductance Lr energy storage deficiency, the no-voltage of can't realize lagging behind pipe Q2, Q3 is open-minded, and loss is big, and energy conversion efficiency is not high;
When 2) the hysteresis pipe was opened, secondary diode D7～D10 oppositely recovered to have strong vibration, and voltage stress is bigger on the diode, and is high to the electrical quantity requirement of diode, reduces system reliability, and the turn-on consumption of hysteresis pipe is very big;
3) existence of resonant inductance Lr can cause the secondary duty-cycle loss, can reduce the converter conversion efficiency equally.
Summary of the invention
, poor reliability low for the hysteresis pipe zero-pressure difficulty, the energy conversion efficiency that overcome existing tri-level half-bridge phase shift no-voltage converter, turn-on consumption are big, duty ratio runs off heavier deficiency, the utility model provide a kind of effective improvement lag behind pipe zero-pressure condition, improve energy conversion efficiency, strengthen reliability, reduce turn-on consumption, reduce the modified model tri-level half-bridge phase shift no-voltage converter that duty ratio runs off.
The technical scheme that its technical problem that solves the utility model adopts is:
A kind of modified model tri-level half-bridge phase shift no-voltage converter, comprise two dividing potential drop electric capacity (C5, C6), two clamping diodes (D5, D6), last switch brachium pontis, following switch brachium pontis, transformer (T1), output rectifier and filter and load Rl, wherein, the described switch brachium pontis of going up comprises on first arm path on the arm path and second, arm path series connection on the arm path and second on first, described switch brachium pontis down comprises first time arm path and second time arm path, first time arm path and second time arm path series connection;
Two dividing potential drop electric capacity (C5, C6) series connection between, two clamping diode (D5, D6) series connection between, described two dividing potential drop (C5, C6) intermediate node between and two clamping diode (D5, D6) connected node between connects, described two clamping diode (D5, D6) connected node between is connected with an end on the former limit of transformer (T1), a dividing potential drop electric capacity (C5) is connected with arm path on first, on the clamping diode (D5) and first on the arm path and second intermediate node between the arm path be connected, arm path is connected with the other end on the former limit of transformer (T1) on described second; Another dividing potential drop electric capacity (C6) is connected with first time arm path, intermediate node between another clamping diode (D5) and first time arm path and the second time arm path is connected, and described first time arm path is connected with the other end on the former limit of transformer (T1);
The secondary of transformer (T1) is connected with output rectifier and filter, and described current rectifying and wave filtering circuit output meets load R
LDescribed modified model tri-level half-bridge phase shift no-voltage converter also comprises auxiliary branch, described auxiliary branch comprises first additional capacitor (C7), second additional capacitor (C7a) and additional inductor (L1), wherein, on one end and first of first additional capacitor (C7) on the arm path and second intermediate node between the arm path be connected, first additional capacitor (C7) other end is connected with second additional capacitor (C7a), intermediate node between the other end of second additional capacitor (C7a) and first time arm path and the second time arm path is connected, one end of additional inductor (L1) is connected with the other end on the former limit of transformer (T1), and the other end of additional inductor (L1) is connected with intermediate node between first additional capacitor (C7) and second additional capacitor (C7a).
Further, described output rectifier and filter is a full-bridge rectification filter circuit.Or: described output rectifier and filter is the half-bridge current rectifying and wave filtering circuit.
Further, the arm path road comprises on parallel with one another first on the switching tube (Q1), first switching capacity (C1) on the diode (D1) and first on first, and arm path comprises on parallel with one another second on the switching tube (Q2), second switching capacity (C2) on the diode (D2) and second on second; First time the arm path road comprises first time switching tube (Q3) parallel with one another, first time diode (D3) and first time switching capacity (C3), and arm path comprises second time switching tube (Q4) parallel with one another, second time diode (D4) and second time switching capacity (C4) on second.
Further again, diode on described first (D1) is the parasitic diode of switching tube on first (Q1), diode on described second (D2) is the parasitic diode of switching tube on second (Q2), described first time diode (D3) is the parasitic diode of first time switching tube (Q3), and described second time diode (D4) is the parasitic diode of second time switching tube (Q4).
Technical conceive of the present utility model is: made up an auxiliary branch on common tri-level half-bridge phase-shift circuit basis.Referring to Fig. 3, capacitor C 7 in the common tri-level half-bridge phase-shift circuit is made into C7 and C7a series connection, inductance L 1 links to each other with upper and lower brachium pontis tie point A with C7, C7a series connection point E, removes the resonant inductance Lr in the common tri-level half-bridge phase-shift circuit.
Because the effect of auxiliary branch L1, C7, C7a makes the lagging leg of converter to realize zero voltage switch in underloading.After removing the resonant inductance Lr that links to each other with transformer T1, make the problem of duty-cycle loss be greatly improved, only the leakage inductance L of transformer T1
1KIn action, and transformer leakage inductance L
1KBe very little.
The beneficial effects of the utility model mainly show: 1, under the condition that does not increase the excess power device, improved the full-load range zero voltage switch condition of switching tube; 2, reduce duty-cycle loss; 3, good restraining is lived the reverse recovery voltage spike of secondary diode D7 ~ D10, because switching tube is just open-minded after the secondary diode is finished reverse recovery, turn-on consumption declines to a great extent, and makes that device work is more reliable and stable simultaneously, improve overall efficiency, reduced electromagnetic radiation.
Description of drawings
Fig. 1 is common tri-level half-bridge phase shift no-voltage converter schematic diagram.
Fig. 2 is the schematic diagram (the full-bridge rectification mode is adopted in the output rectification) of tri-level half-bridge phase shift no-voltage converter of the present utility model.
Fig. 3 is the schematic diagram (way of full-wave rectification is adopted in the output rectification) of tri-level half-bridge phase shift no-voltage converter of the present utility model.
Fig. 4 is t
0~ t
1The mode of operation schematic diagram in stage.
Fig. 5 is t
1~ t
2The mode of operation schematic diagram in stage.
Fig. 6 is t
2~ t
3Stage mode of operation schematic diagram.
Fig. 7 is t
3~ t
4Stage mode of operation schematic diagram.
Fig. 8 is t
4~ t
5Stage mode of operation schematic diagram.
Fig. 9 is t
5~ stage mode of operation schematic diagram.
Figure 10 is the working waveform figure of the utility model execution mode, wherein:
Vg1, Vg2, Vg3, Vg4 are the drive waveforms of Q1, Q2, Q3, Q4;
Vds1, Vds2, Vds3, Vds4 are leakage, the source voltage waveform of Q1Q2Q3Q4;
Vp1 is a transformer T1 original edge voltage waveform;
Ip1 is a transformer T1 primary current waveform;
Id1, Id2, Id3, Id4 are the current waveform of D1, D2, D3, D4;
Il1 is the current waveform of L1.
Embodiment
Below in conjunction with accompanying drawing the utility model is further described.
With reference to Fig. 1～Figure 10, a kind of modified model tri-level half-bridge phase shift no-voltage converter, comprise two dividing potential drop electric capacity (C5, C6), two clamping diode (D5, D6), last switch brachium pontis, following switch brachium pontis, transformer (T1), output rectifier and filter and load Rl, wherein, the described switch brachium pontis of going up comprises on first arm path on the arm path and second, arm path series connection on the arm path and second on first, described switch brachium pontis down comprises first time arm path and second time arm path, first time arm path and second time arm path series connection;
Two dividing potential drop electric capacity (C5, C6) series connection between, two clamping diode (D5, D6) series connection between, described two dividing potential drop (C5, C6) intermediate node between and two clamping diode (D5, D6) connected node between connects, described two clamping diode (D5, D6) connected node between is connected with an end on the former limit of transformer (T1), a dividing potential drop electric capacity (C5) is connected with arm path on first, on the clamping diode (D5) and first on the arm path and second intermediate node between the arm path be connected, arm path is connected with the other end on the former limit of transformer (T1) on described second; Another dividing potential drop electric capacity (C6) is connected with first time arm path, intermediate node between another clamping diode (D5) and first time arm path and the second time arm path is connected, and described first time arm path is connected with the other end on the former limit of transformer (T1);
The secondary of transformer (T1) is connected with output rectifier and filter, and described current rectifying and wave filtering circuit output meets load R
LDescribed modified model tri-level half-bridge phase shift no-voltage converter also comprises auxiliary branch, described auxiliary branch comprises first additional capacitor (C7), second additional capacitor (C7a) and additional inductor (L1), wherein, on one end and first of first additional capacitor (C7) on the arm path and second intermediate node between the arm path be connected, first additional capacitor (C7) other end is connected with second additional capacitor (C7a), intermediate node between the other end of second additional capacitor (C7a) and first time arm path and the second time arm path is connected, one end of additional inductor (L1) is connected with the other end on the former limit of transformer (T1), and the other end of additional inductor (L1) is connected with intermediate node between first additional capacitor (C7) and second additional capacitor (C7a).
With reference to Fig. 2, described output rectifier and filter is a full-bridge rectification filter circuit.Or: with reference to Fig. 3, described output rectifier and filter is the half-bridge current rectifying and wave filtering circuit.
The arm path road comprises on parallel with one another first on the switching tube (Q1), first switching capacity (C1) on the diode (D1) and first on first, and arm path comprises on parallel with one another second on the switching tube (Q2), second switching capacity (C2) on the diode (D2) and second on second; First time the arm path road comprises first time switching tube (Q3) parallel with one another, first time diode (D3) and first time switching capacity (C3), and arm path comprises second time switching tube (Q4) parallel with one another, second time diode (D4) and second time switching capacity (C4) on second.
Diode on described first (D1) is the parasitic diode of switching tube on first (Q1), diode on described second (D2) is the parasitic diode of switching tube on second (Q2), described first time diode (D3) is the parasitic diode of first time switching tube (Q3), and described second time diode (D4) is the parasitic diode of second time switching tube (Q4).
Switching tube (Q1), second time switching tube (Q4) are as advance pipe on first in phase shifting control, and switching tube (Q2), first time switching tube (Q3) are as the pipe that lags behind on second.
Fig. 4 to Figure 10 is the working mode figure of Fig. 2, and the mode of operation of Fig. 3 also can be made similar analysis.Wherein hardware is walked the path by electric current reality under the corresponding modes, and empty body member does not then participate in work under this pattern.Figure 10 then is corresponding to the formed waveform of each mode phases.Analyze for convenience, suppose not have the device of specified otherwise to be desirable device; L1 is enough big, and its electric current is a linear change, and its electric current remains unchanged in the pipe switching process that lags behind; First additional capacitor (C7), second additional capacitor (C7a) are enough big, and its voltage remains unchanged.
The effect of two clamping diodes (D5, D6) be switching tube on first (Q1), second time switching tube (Q4) when opening to the charging of first additional capacitor (C7) and second additional capacitor (C7a) to realize that voltage clamp after first additional capacitor (C7) and second additional capacitor (C7a) are connected in half of input voltage, no longer relates in subsequent analysis.
Initial condition, switching tube (Q2) is in conducting state on the switching tube on first (Q1), second, the voltage of first additional capacitor (C7) is added in additional inductor (L1) two ends by switching tube (Q2) on second, the electric current of additional inductor (L1) is linear to be increased, and the rectifier diode (D7, D10) of transformer secondary by rectification circuit, inductor rectifier (Lf) are to load R1 energy regenerative.
With reference to Fig. 4, Figure 10, pattern 1(t0 ~ t1 stage), at t0 constantly, switching tube (Q1) no-voltage is turn-offed (effect of C1, C4) on first.Capacitance switch on first (C1) is charged by load current, second time switching capacity (C4) by switching tube (Q2), transformer (T1) on second additional capacitor (C7a), first additional capacitor (C7), second to load discharge, capacitance switch on first (C1), second time switching capacity C4) linear respectively rising of voltage and decline, transformer (T1) secondary voltage is also linear to descend; Additional inductor (L1) electric current continues linear increasing.
With reference to Fig. 5, Figure 10, pattern 2(t
1~ t
2Stage), at t
1Constantly, capacitance switch on first (C1) is charged to Vin/2, second time switching capacity (C4) discharges into 0, transformer (T1) secondary voltage also reduces to 0, by the rectifier diode (D8 of rectification circuit, D9) short circuit, second time diode (D4) conducting of second time switching tube (Q4), transformer (T1) primary current is along transformer (T1), dividing potential drop electric capacity (C6), second time diode (D4), second additional capacitor (C7a), first additional capacitor (C7), switching tube on second (Q2), transformer leakage inductance (Lk), transformer (T1) is made circulation; Additional inductor (L1) electric current continues linear increasing.Open second time switching tube (Q4) in this stage, second time switching tube (Q4) is that no-voltage is open-minded.
With reference to Fig. 6, Figure 10, mode 3 (t
2~ t
3Stage), at t
2Constantly, the effect that switching tube (Q2) no-voltage is turn-offed switching capacity (C2), first time switching capacity (C3) on second on second).Because transformer (T1) secondary is by short circuit, resonance takes place in switching capacity (C2) and leakage inductance (Lk) on first time switching capacity (C3), second, because the electric current of additional inductor (L1) participates in, switching capacity (C2) is respectively by charge and discharge on first time switching capacity (C3), second, leakage inductance (Lk) electric current is reverse rapidly, the rectifier diode of the rectification circuit of transformer secondary (D7, D10) beginning and other two rectifier diodes (D8, D9) changes of current.
With reference to Fig. 7, Figure 10, pattern 4(t
3~ t
4Stage), at t
3Constantly, the rectifier diode of the rectification circuit of transformer secondary (D7, D10) electric current reduces to zero, and the change of current finishes.The transformer original edge voltage begins to rise, rectifier diode (the D7 of rectification circuit, D10) begin to bear reverse voltage, reverse recovery phenomena appears, rectifier diode (D7 when rectification circuit, D10) reverse recovery current and load current sum are converted the electric current of former limit greater than additional inductor (L1), first time switching capacity (C3) charging, switching capacity on second (C2) thus discharge makes the voltage of first time switching capacity (C3) of short duration rising occur, work as D7, after D10 oppositely recovers to finish, oppositely end, first time switching capacity (C3) continues discharge, switching capacity on second (C2) continues charging, and first time switching capacity (C3) voltage continues to descend.This stage has been suppressed the reverse recovery current and the due to voltage spikes of other two rectifier diodes (D8, D9) owing to the restriction of additional inductor (L1) electric current.
With reference to Fig. 8, Figure 10, pattern 5(t
4~ t
5Stage), at t
4Constantly, first time switching capacity (C3) discharges into zero volt, and switching capacity (C2) is charged to Vin/2, first time diode (D3) conducting of first time switching tube (Q3) on second.The electric current part of inductance additional inductor (L1) powers to the load, and a part is walked circulation by first time diode (D3), and the electric current of additional inductor (L1) begins linear decline; This moment is open-minded, and first time switching tube (Q3) is that no-voltage is open-minded.Because the effect of additional inductor (L1) electric current, be easy to first time switching capacity (C3) discharged into 0, realize, the no-voltage of first time switching tube (Q3) is open-minded, because main transformer is not gone here and there resonant inductance (Lr) and additional inductor (L1) and is powered in advance to load, make the duty-cycle loss problem be resolved, the reverse recovery of other two rectifier diodes (D8, D9) occurs in addition, before first time switching tube (Q3) opened, therefore, first time switching tube (Q3) do not have the excess loss that oppositely recovery causes.
With reference to Fig. 9, Figure 10, pattern 6(t
5~ the stage), along with the decline of additional inductor (L1) electric current, first time diode (D3) electric current also and then descends, at t
5First time diode (D3) electric current drops to zero constantly,, first time switching tube (Q3) begins to walk forward current, enters other half work period.Repeat pattern t
1To t
5Process, be not repeated.
Claims (5)
1. modified model tri-level half-bridge phase shift no-voltage converter, comprise two dividing potential drop electric capacity (C5, C6), two clamping diodes (D5, D6), last switch brachium pontis, following switch brachium pontis, transformer (T1), output rectifier and filter and load Rl, wherein, the described switch brachium pontis of going up comprises on first arm path on the arm path and second, arm path series connection on the arm path and second on first, described switch brachium pontis down comprises first time arm path and second time arm path, first time arm path and second time arm path series connection;
Two dividing potential drop electric capacity (C5, C6) series connection between, two clamping diode (D5, D6) series connection between, described two dividing potential drop (C5, C6) intermediate node between and two clamping diode (D5, D6) connected node between connects, described two clamping diode (D5, D6) connected node between is connected with an end on the former limit of transformer (T1), a dividing potential drop electric capacity (C5) is connected with arm path on first, on the clamping diode (D5) and first on the arm path and second intermediate node between the arm path be connected, arm path is connected with the other end on the former limit of transformer (T1) on described second; Another dividing potential drop electric capacity (C6) is connected with first time arm path, intermediate node between another clamping diode (D5) and first time arm path and the second time arm path is connected, and described first time arm path is connected with the other end on the former limit of transformer (T1);
The secondary of transformer (T1) is connected with output rectifier and filter, and described current rectifying and wave filtering circuit output meets load RL; It is characterized in that: described modified model tri-level half-bridge phase shift no-voltage converter also comprises auxiliary branch, described auxiliary branch comprises first additional capacitor (C7), second additional capacitor (C7a) and additional inductor (L1), wherein, on one end and first of first additional capacitor (C7) on the arm path and second intermediate node between the arm path be connected, first additional capacitor (C7) other end is connected with second additional capacitor (C7a), intermediate node between the other end of second additional capacitor (C7a) and first time arm path and the second time arm path is connected, one end of additional inductor (L1) is connected with the other end on the former limit of transformer (T1), and the other end of additional inductor (L1) is connected with intermediate node between first additional capacitor (C7) and second additional capacitor (C7a).
2. modified model tri-level half-bridge phase shift no-voltage converter as claimed in claim 1, it is characterized in that: described output rectifier and filter is a full-bridge rectification filter circuit.
3. modified model tri-level half-bridge phase shift no-voltage converter as claimed in claim 1, it is characterized in that: described output rectifier and filter is the half-bridge current rectifying and wave filtering circuit.
4. as the described modified model tri-level half-bridge of one of claim 1-3 phase shift no-voltage converter, it is characterized in that: the arm path road comprises on parallel with one another first on the switching tube (Q1), first switching capacity (C1) on the diode (D1) and first on first, and arm path comprises on parallel with one another second on the switching tube (Q2), second switching capacity (C2) on the diode (D2) and second on second; First time the arm path road comprises first time switching tube (Q3) parallel with one another, first time diode (D3) and first time switching capacity (C3), and arm path comprises second time switching tube (Q4) parallel with one another, second time diode (D4) and second time switching capacity (C4) on second.
5. modified model tri-level half-bridge phase shift no-voltage converter as claimed in claim 4, it is characterized in that: diode on described first (D1) is the parasitic diode of switching tube on first (Q1), diode on described second (D2) is the parasitic diode of switching tube on second (Q2), described first time diode (D3) is the parasitic diode of first time switching tube (Q3), and described second time diode (D4) is the parasitic diode of second time switching tube (Q4).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205521587U CN201830143U (en) | 2010-03-10 | 2010-09-30 | Modified three-level half-bridge phase-shift zero-voltage transformer |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201020126528.0 | 2010-03-10 | ||
| CN201020126528 | 2010-03-10 | ||
| CN2010205521587U CN201830143U (en) | 2010-03-10 | 2010-09-30 | Modified three-level half-bridge phase-shift zero-voltage transformer |
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| CN201830143U true CN201830143U (en) | 2011-05-11 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102594152A (en) * | 2012-02-27 | 2012-07-18 | 浙江大学 | Series-type half-bridge DC-DC (direct current) converter |
-
2010
- 2010-09-30 CN CN2010205521587U patent/CN201830143U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102594152A (en) * | 2012-02-27 | 2012-07-18 | 浙江大学 | Series-type half-bridge DC-DC (direct current) converter |
| CN102594152B (en) * | 2012-02-27 | 2014-08-06 | 浙江大学 | Series-type half-bridge DC-DC (direct current) converter |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20110511 |
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| CX01 | Expiry of patent term |