CN102624243A - Isolation-type half-bridge three-level dual-direction direct-current/direct-current (DC/DC) converter - Google Patents
Isolation-type half-bridge three-level dual-direction direct-current/direct-current (DC/DC) converter Download PDFInfo
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Abstract
The invention relates to an isolation-type half-bridge three-level dual-direction direct-current/direct-current (DC/DC) converter. The converter comprises an input-side half-bridge three-level circuit and an output-side half-bridge three-level circuit, wherein the input-side half-bridge three-level circuit is connected with the output-side half-bridge three-level circuit through a resonant circuit and a high-frequency transformer. The half-bride three-level circuit is used for rectification and inversion, the resonant circuit is used for soft switching control, and the high-frequency transformer is used for isolation and transformation. The isolation-type half-bridge three-level dual-direction DC/DC converter has the advantages that: by adopting the multi-level technology, the resonant technology and the phase shifting control technology, the converter can be flexibly switched between a two-level state and a three-level state, soft switching of a switch tube can be realized, the switching loss can be effectively reduced, and the working efficiency can be improved. The voltage stress of the switch tube can be reduced by 50 percent, and the range of the input range of the circuit can be enlarged. At the same time, the size of the converter is reduced, the power density and the dynamic performance of the converter can be improved, and the cost can also be reduced.
Description
Technical field
The present invention relates to two-way DC/DC converter, the two-way DC/DC converter of particularly a kind of isolated half-bridge three-level.
Background technology
Two-way DC/DC converter has and uses power device few; Volume is little; Power density is high and regulate advantage such as power transfer direction automatically, and it has been applied in application scenarios such as electric automobile and Vehicular power system, uninterruptible power system (UPS), Aero-Space power-supply system, fuel cell, new forms of energy and distributed generation system widely.
Along with the fast development of science and production with to the requirement of environmental protection and energy savings, more and more to the demand of two-way DC/DC converter.At present, the topological structure of two-way DC/DC converter can be divided into isolated and non-isolated structure.In recent years, mostly the two-way isolated DC/DC converter of half-bridge structure and full bridge structure is two level converters, and this converter has reliability height, characteristic of simple structure, but the voltage stress that each switching tube bears is input voltage or output voltage.In view of current switch tube voltage level, corresponding the reducing of input/output voltage scope of this structure is difficult to be implemented in the application under the high voltage condition.
In the occasion of using two-way DC/DC converter; All require to reduce as much as possible the volume and weight of converter; And the operating frequency that improves switching tube can realize the requirement of miniaturization, so the high frequencyization of two-way DC/DC converter has great importance for the power density that improves whole converter.But when improving switching frequency, brought the switching loss problem of switching tube again.Effectively reduce switching loss and be the key that can two-way DC/DC converter the high frequency operation.
Summary of the invention
The objective of the invention is to overcome above-mentioned defective; Provide a kind of isolated half-bridge three-level two-way DC/DC converter; Can under the situation of different input/output voltages and load variations, make system can transmit maximum power, widen the soft switch of switching tube and realize scope through the phase shift adjusting; Reduce the voltage and current stress of device and the loss of device, improve the efficient of system.
For achieving the above object, the two-way DC/DC converter of a kind of isolated half-bridge three-level provided by the invention comprises major loop and phase-shift control circuit thereof, and said major loop comprises:
Input side half-bridge three-level circuit and outlet side half-bridge three-level circuit are respectively applied for rectification or inversion, have identical structure;
First resonant circuit and second resonant circuit are respectively applied for soft switch control;
High frequency transformer is used for isolating and transformation;
Wherein, The input of said input side half-bridge three-level circuit links to each other with input net side; The output of said input side half-bridge three-level circuit links to each other with the input of said first resonant circuit; The output of said first resonant circuit links to each other with said high frequency transformer primary side; Said high frequency transformer primary side links to each other with the input of said second resonant circuit, and the output of said second resonant circuit links to each other with the input of said outlet side half-bridge three-level circuit, and the output of said outlet side half-bridge three-level circuit links to each other with output net side; Has first phase shifting angle in the said input side half-bridge three-level circuit; Has second phase shifting angle in the said outlet side half-bridge three-level circuit; Have the 3rd phase shifting angle between said input side half-bridge three-level circuit and the said outlet side half-bridge three-level circuit, said phase-shift control circuit output is to the control signal of three phase shifting angles.When energy from said input net effluent during to said output net side, said input side half-bridge three-level circuit is in inverter mode, said outlet side half-bridge three-level circuit is in rectification state; When energy when said outlet side flows to said input side, said input side half-bridge three-level circuit is in rectification state, said outlet side half-bridge three-level circuit is in inverter mode.
The two-way DC/DC converter of the isolated half-bridge three-level of the present invention, wherein said half-bridge three-level circuit comprises half-bridge three-level brachium pontis, bleeder circuit, clamp circuit and striding capacitance, wherein:
Said half-bridge three-level brachium pontis comprises first switching tube, second switch pipe, the 3rd switching tube, the 4th switching tube of forward series connection successively; The series connection mid point of said second switch pipe and the 3rd switching tube links to each other with said resonant circuit, 4 parallelly connected separately individual diodes of switching tube and a parasitic capacitance;
Said bleeder circuit comprises the dividing potential drop electric capacity that 2 capacitances equate, is connected in parallel on the positive and negative end of direct current net side after 2 dividing potential drop capacitances in series;
Said clamp circuit comprises 2 fly-wheel diodes of forward series connection, and the negative electrode of first diode links to each other with the series connection mid point of first switching tube and second switch pipe, and the anode of second diode links to each other with the series connection mid point of the 3rd switching tube and the 4th switching tube;
The series connection mid point of 2 said fly-wheel diodes links to each other with the series connection mid point of 2 said dividing potential drop electric capacity;
Said striding capacitance is parallelly connected with said clamp circuit.
The two-way DC/DC converter of the isolated half-bridge three-level of the present invention; The voltage of wherein said high frequency transformer primary side striding capacitance is the half the of input voltage when steady operation, and the voltage of said high frequency transformer primary side striding capacitance is the half the of output voltage when steady operation.
The two-way DC/DC converter of the isolated half-bridge three-level of the present invention; Wherein said first resonant circuit and second resonant circuit are respectively the series-parallel circuit of being made up of inductance and electric capacity; First resonant inductance and first resonant capacitance that comprise mutual series connection, its series connection node is an output.
The two-way DC/DC converter of the isolated half-bridge three-level of the present invention; Wherein said first resonant circuit and second resonant circuit are respectively the series-parallel circuit of being made up of inductance and electric capacity; Comprise first resonant inductance and first resonant capacitance of mutual series connection, the other end of said first resonant capacitance is an output.
The two-way DC/DC converter of the isolated half-bridge three-level of the present invention; Wherein said first resonant circuit and second resonant circuit are respectively the series-parallel circuit of being made up of inductance and electric capacity; First resonant inductance, first resonant capacitance and second resonant inductance that comprise mutual series connection, said first resonant capacitance is an output with the node of connecting of said second resonant inductance.
The two-way DC/DC converter of the isolated half-bridge three-level of the present invention; Wherein said first resonant circuit and second resonant circuit are respectively the series-parallel circuit of being made up of inductance and electric capacity; First resonant inductance, first resonant capacitance and second resonant capacitance that comprise mutual series connection, said first resonant capacitance is an output with the node of connecting of said second resonant capacitance.
The two-way DC/DC converter of the isolated half-bridge three-level of the present invention; Wherein said first resonant circuit and second resonant circuit are respectively the series-parallel circuit of being made up of inductance and electric capacity; First resonant inductance, first resonant capacitance, second resonant inductance and second resonant capacitance that comprise mutual series connection, said first resonant capacitance is an output with the node of connecting of said second resonant inductance.
The advantage and the good effect of the two-way DC/DC converter of the isolated half-bridge three-level of the present invention are: owing to adopted multilevel converter, harmonic technology and phase shift technology; This converter can be operated between two level and three level states neatly; It can realize the soft switch of switching tube; Effectively reduce the switching loss of switching device, improved the operating efficiency of converter.The voltage stress of its switching tube has reduced half the, has increased the input/output voltage scope of circuit.Simultaneously, reduce the volume of converter, improved power density of transform and dynamic property, also reduced cost.
To combine embodiment to be elaborated below with reference to accompanying drawing.
Description of drawings
Fig. 1 is the structure chart of the two-way DC/DC converter of the isolated half-bridge three-level of the present invention;
Fig. 2 is the circuit diagram of the two-way DC/DC converter of the isolated half-bridge three-level of the present invention;
Fig. 3 is five kinds of circuit structure diagrams of resonant circuit;
Work wave when Fig. 4 is single phase shift;
Fig. 5 is the work wave of two-track phase time.
Embodiment
With reference to Fig. 1, the two-way DC/DC converter of the isolated half-bridge three-level of the present invention comprises major loop and phase-shift control circuit thereof.Major loop comprises input side half-bridge three-level circuit, the first resonant circuit Z
p, high frequency transformer Tr, the second resonant circuit Z
sWith outlet side half-bridge three-level circuit.Input side half-bridge three-level circuit and outlet side half-bridge three-level circuit are respectively applied for rectification or inversion, have identical structure.The first resonant circuit Z
pWith the second resonant circuit Z
sBe respectively applied for soft switch control.High frequency transformer Tr is used for isolating and transformation.The input of input side half-bridge three-level circuit links to each other the output of input side half-bridge three-level circuit and the first resonant circuit Z with input net side
pInput link to each other the first resonant circuit Z
pOutput link to each other the high frequency transformer primary side and the second resonant circuit Z with the high frequency transformer primary side
sInput link to each other the second resonant circuit Z
sOutput link to each other with the input of outlet side half-bridge three-level circuit, the output of outlet side half-bridge three-level circuit links to each other with output net side.
In the embodiment of the two-way DC/DC converter of the isolated half-bridge three-level of the present invention; With reference to Fig. 2; Above-mentioned half-bridge three-level circuit, promptly input side half-bridge three-level circuit and outlet side half-bridge three-level circuit comprise half-bridge three-level brachium pontis, bleeder circuit, clamp circuit and striding capacitance respectively.
Wherein: the half-bridge three-level brachium pontis comprises the first switching tube S of forward series connection successively
1Or S
1', second switch pipe S
2Or S
2', the 3rd switching tube S
3Or S
3', the 4th switching tube S
4Or S
4'.Second switch pipe S
2Or S
2' and the 3rd switching tube S
3Or S
3' series connection mid point and resonant circuit Z
pLink to each other.4 parallelly connected separately individual diodes of switching tube and a parasitic capacitance.
Bleeder circuit comprises the dividing potential drop capacitor C that 2 capacitances equate
11And C
12Or C
21And C
22, 2 dividing potential drop capacitor C
11And C
12Or C
21And C
22Be connected in parallel on the positive and negative end of direct current net side after the series connection.
Clamp circuit comprises 2 sustained diode of forward series connection
11And D
12Or D
21And D
22, the first diode D
11Or D
21The negative electrode and the first switching tube S
1Or S
1' and second switch pipe S
2Or S
2' the series connection mid point link to each other the second diode D
12Or D
22Anode and the 3rd switching tube S
3Or S
3' and the 4th switching tube S
4Or S
4' the series connection mid point link to each other.
2 sustained diode
11And D
12Or D
21And D
22Series connection mid point and 2 dividing potential drop capacitor C
11And C
12Or C
21And C
22The series connection mid point link to each other.Striding capacitance Css
1Or Css
2Parallelly connected with clamp circuit.High frequency transformer primary side striding capacitance Css
1Voltage be the half the of input voltage when steady operation, primary side striding capacitance Css
2Voltage be the half the of output voltage when steady operation.
In the embodiment of the two-way DC/DC converter of the isolated half-bridge three-level of the present invention, with reference to Fig. 3 (a), the first resonant circuit Z
pWith the second resonant circuit Z
sBe respectively the series-parallel circuit of forming by inductance and electric capacity, comprise the first resonant inductance L of mutual series connection
11With the first resonant capacitance C
111, its series connection node is an output.
With reference to Fig. 3 (b), the first resonant circuit Z
pWith the second resonant circuit Z
sBe respectively the series-parallel circuit of forming by inductance and electric capacity, comprise the first resonant inductance L of mutual series connection
21With the first resonant capacitance C
211, the first resonant capacitance C
211The other end be output.
With reference to Fig. 3 (c), the first resonant circuit Z
pWith the second resonant circuit Z
sBe respectively the series-parallel circuit of forming by inductance and electric capacity, comprise the first resonant inductance L of mutual series connection
31, the first resonant capacitance C
31With the second resonant inductance L
32, the first resonant capacitance C
31With the second resonant inductance L
32The series connection node be output.
With reference to Fig. 3 (d), the first resonant circuit Z
pWith the second resonant circuit Z
sBe respectively the series-parallel circuit of forming by inductance and electric capacity, comprise the first resonant inductance L of mutual series connection
41, the first resonant capacitance C
41With the second resonant capacitance C
42, the first resonant capacitance C
41With the second resonant capacitance C
42The series connection node be output.
With reference to Fig. 3 (e), the first resonant circuit Z
pWith the second resonant circuit Z
sBe respectively the series-parallel circuit of forming by inductance and electric capacity, comprise the first resonant inductance L of mutual series connection
51, the first resonant capacitance C
51, the second resonant inductance L
52With the second resonant capacitance C
52, the first resonant capacitance C
51With the second resonant inductance L
52The series connection node be output.
The two-way DC/DC converter of the isolated half-bridge three-level of the present invention has the first phase shifting angle φ in the input side half-bridge three-level circuit
p, have the second phase shifting angle φ in the outlet side half-bridge three-level circuit
sHas the 3rd phase shifting angle φ between input side half-bridge three-level circuit and the outlet side half-bridge three-level circuit; Phase-shift control circuit output is to the control signal of three phase shifting angles; When energy was netted effluent to output net side from input, input side half-bridge three-level circuit was in inverter mode, and outlet side half-bridge three-level circuit is in rectification state; When energy when outlet side flows to input side, input side half-bridge three-level circuit is in rectification state, outlet side half-bridge three-level circuit is in inverter mode.
The operation principle of the two-way DC/DC converter of the isolated half-bridge three-level of the present invention phase shifting control is described below.
The mode of operation of the two-way DC/DC converter of the isolated half-bridge three-level of the present invention is divided into two kinds; A kind of is that energy flows to outlet side by input side; Input side half-bridge three-level circuit working is at inverter mode; Outlet side half-bridge three-level circuit working is at rectification state, and the phase shifting angle φ between input side half-bridge three-level circuit and the outlet side half-bridge three-level circuit is for just; A kind of is that energy flows to input side by outlet side; Input side half-bridge three-level circuit working is at rectification state; Outlet side half-bridge three-level circuit working is at inverter mode, and the phase shifting angle φ between input side half-bridge three-level circuit and the outlet side half-bridge three-level circuit is for negative.In two half-bridge three-level circuit, be positioned at two outer switching tubes of striding capacitance and be always leading-bridge, two pipes that are positioned at striding capacitance are all the time as lagging leg, through regulating the phase shifting angle φ in the half-bridge three-level circuit
pAnd φ
sValue, make input side voltage and outlet side voltage be respectively two level or three level.When the energy two-way flow, what of the size control output energy through regulating three phase shifting angles.
With reference to Fig. 4 (a), provided in φ＞0 o'clock the work wave between the input side brachium pontis during phase shift.
With reference to Fig. 4 (b), provided in φ＜0 o'clock the work wave between the input side brachium pontis during phase shift.
With reference to Fig. 4 (c), provided in φ＞0 o'clock the work wave between the outlet side brachium pontis during phase shift.
With reference to Fig. 4 (d), provided in φ＜0 o'clock the work wave between the outlet side brachium pontis during phase shift.
With reference to Fig. 5 (a), the work wave that has provided in φ＞0 o'clock.
With reference to Fig. 5 (b), the work wave that has provided in φ＜0 o'clock.
The phase shifting control of the two-way DC/DC converter of the isolated half-bridge three-level of the present invention is under the situation of different input/output voltages and load variations; Through regulating three phase shifting angles, make system can transmit maximum power, widened the scope of the soft switch realization of switching tube; The voltage and current stress that has reduced and the loss of device; Reduce the volume of high frequency transformer and relative loss, reduced idle and existence circulation, also improved the efficient of system.
Embodiment recited above describes preferred implementation of the present invention; Be not that design of the present invention and scope are limited; Do not breaking away under the design prerequisite of the present invention, common engineers and technicians make technical scheme of the present invention in this area various modification and improvement all should fall into protection scope of the present invention; The technology contents that the present invention asks for protection all is documented in claims.
Claims (8)
1. the two-way DC/DC converter of isolated half-bridge three-level comprises major loop and phase-shift control circuit thereof, and it is characterized in that: said major loop comprises:
Input side half-bridge three-level circuit and outlet side half-bridge three-level circuit are respectively applied for rectification or inversion, have identical structure;
First resonant circuit (the Z
p) and the second resonant circuit (Z
s), be respectively applied for soft switch control;
High frequency transformer (Tr) is used for isolating and transformation;
Wherein, the input of said input side half-bridge three-level circuit links to each other the output of said input side half-bridge three-level circuit and the said first resonant circuit (Z with input net side
p) input link to each other the said first resonant circuit (Z
p) output link to each other said high frequency transformer primary side and the said second resonant circuit (Z with said high frequency transformer primary side
s) input link to each other the said second resonant circuit (Z
s) output link to each other with the input of said outlet side half-bridge three-level circuit, the output of said outlet side half-bridge three-level circuit links to each other with output net side; Has the first phase shifting angle (φ in the said input side half-bridge three-level circuit
p), have the second phase shifting angle (φ in the said outlet side half-bridge three-level circuit
s); Has the 3rd phase shifting angle (φ) between said input side half-bridge three-level circuit and the said outlet side half-bridge three-level circuit; Said phase-shift control circuit output is to the control signal of three phase shifting angles; When energy from said input net effluent during to said output net side, said input side half-bridge three-level circuit is in inverter mode, said outlet side half-bridge three-level circuit is in rectification state; When energy when said outlet side flows to said input side, said input side half-bridge three-level circuit is in rectification state, said outlet side half-bridge three-level circuit is in inverter mode.
2. the two-way DC/DC converter of isolated half-bridge three-level according to claim 1 is characterized in that: wherein said half-bridge three-level circuit comprises half-bridge three-level brachium pontis, bleeder circuit, clamp circuit and striding capacitance, wherein:
Said half-bridge three-level brachium pontis comprises the first switching tube (S of forward series connection successively
1Or S
1'), second switch pipe (S
2Or S
2'), the 3rd switching tube (S
3Or S
3'), the 4th switching tube (S
4Or S
4'), said second switch pipe (S
2Or S
2') and the 3rd switching tube (S
3Or S
3') series connection mid point and said resonant circuit (Z
p) link to each other 4 parallelly connected separately individual diodes of switching tube and a parasitic capacitance;
Said bleeder circuit comprises the dividing potential drop electric capacity (C that 2 capacitances equate
11And C
12Or C
21And C
22), 2 dividing potential drop electric capacity (C
11And C
12Or C
21And C
22) be connected in parallel on the positive and negative end of direct current net side after the series connection;
Said clamp circuit comprises 2 fly-wheel diode (D of forward series connection
11And D
12Or D
21And D
22), the first diode (D
11Or D
21) the negative electrode and the first switching tube (S
1Or S
1') and second switch pipe (S
2Or
S') the series connection mid point link to each other the second diode (D
12Or D
22) anode and the 3rd switching tube (S
3Or S
3') and the 4th switching tube (S
4Or S
4') the series connection mid point link to each other; 2 said fly-wheel diode (D
11And D
12Or D
21And D
22) series connection mid point and 2 said dividing potential drop electric capacity (C
11And C
12Or C
21And C
22) the series connection mid point link to each other; Said striding capacitance (Css
1Or Css
2) parallelly connected with said clamp circuit.
3. the two-way DC/DC converter of isolated half-bridge three-level according to claim 1 and 2 is characterized in that: wherein said high frequency transformer primary side striding capacitance (Css
1) voltage be the half the of input voltage when steady operation, said high frequency transformer primary side striding capacitance (Css
2) voltage be the half the of output voltage when steady operation.
4. the two-way DC/DC converter of isolated half-bridge three-level according to claim 3 is characterized in that: the wherein said first resonant circuit (Z
p) and the second resonant circuit (Z
s) be respectively the series-parallel circuit of forming by inductance and electric capacity, comprise the first resonant inductance (L of mutual series connection
11) and the first resonant capacitance (C
111), its series connection node is an output.
5. the two-way DC/DC converter of isolated half-bridge three-level according to claim 3 is characterized in that: the wherein said first resonant circuit (Z
p) and the second resonant circuit (Z
s) be respectively the series-parallel circuit of forming by inductance and electric capacity, comprise the first resonant inductance (L of mutual series connection
21) and the first resonant capacitance (C
211), the said first resonant capacitance (C
211) the other end be output.
6. the two-way DC/DC converter of isolated half-bridge three-level according to claim 3 is characterized in that: the wherein said first resonant circuit (Z
p) and the second resonant circuit (Z
s) be respectively the series-parallel circuit of forming by inductance and electric capacity, comprise the first resonant inductance (L of mutual series connection
31), the first resonant capacitance (C
31) and the second resonant inductance (L
32), the said first resonant capacitance (C
31) and the said second resonant inductance (L
32) the series connection node be output.
7. the two-way DC/DC converter of isolated half-bridge three-level according to claim 3 is characterized in that: the wherein said first resonant circuit (Z
p) and the second resonant circuit (Z
s) be respectively the series-parallel circuit of forming by inductance and electric capacity, comprise the first resonant inductance (L of mutual series connection
41), the first resonant capacitance (C
41) and the second resonant capacitance (C
42), the said first resonant capacitance (C
41) and the said second resonant capacitance (C
42) the series connection node be output.
8. the two-way DC/DC converter of isolated half-bridge three-level according to claim 3 is characterized in that: the wherein said first resonant circuit (Z
p) and the second resonant circuit (Z
s) be respectively the series-parallel circuit of forming by inductance and electric capacity, comprise the first resonant inductance (L of mutual series connection
51), the first resonant capacitance (C
51), the second resonant inductance (L
52) and the second resonant capacitance (C
52), the said first resonant capacitance (C
51) and the said second resonant inductance (L
52) the series connection node be output.
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|---|---|---|---|
| CN201210116908XA CN102624243A (en) | 2012-04-19 | 2012-04-19 | Isolation-type half-bridge three-level dual-direction direct-current/direct-current (DC/DC) converter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210116908XA CN102624243A (en) | 2012-04-19 | 2012-04-19 | Isolation-type half-bridge three-level dual-direction direct-current/direct-current (DC/DC) converter |
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