CN102255548A - Three-level half-bridge soft switching DC (direct current) converting circuit and method for suppressing midpoint drifting - Google Patents
Three-level half-bridge soft switching DC (direct current) converting circuit and method for suppressing midpoint drifting Download PDFInfo
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- CN102255548A CN102255548A CN2011102154871A CN201110215487A CN102255548A CN 102255548 A CN102255548 A CN 102255548A CN 2011102154871 A CN2011102154871 A CN 2011102154871A CN 201110215487 A CN201110215487 A CN 201110215487A CN 102255548 A CN102255548 A CN 102255548A
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Abstract
The invention discloses a three-level half-bridge soft switching DC (direct current) converting circuit and a method for suppressing midpoint drifting. In the circuit, a switching converter is connected with a midpoint in a capacitance voltage division circuit by a bridging capacitor, thus midpoint currents causing the midpoint voltage to drift are accumulated on the bridging capacitor to form DC voltage quantity; and positive and negative working voltages at a transformer end are regulated in accordance with the accumulated voltage quantity on the bridging capacitor, so that the drifting quantity of the midpoint voltages are suppressed. In the three-level half-bridge soft switching DC converting circuit, the basic characteristics of a traditional three-level half-bridge soft switching circuit are reserved; the three-level half-bridge soft switching DC converting circuit can suppress the midpoint voltage drifting of input capacitance effectively, can ensure the smooth realization of lagged turning-off tube soft switching relative to a resonant inductor with less inductance and is low in the duty rate loss. The method has the advantages of low cost, high performance and high reliability.
Description
[technical field]
The present invention relates to the DC-AC translation circuit, relate in particular to the soft switch DC translation circuit of a kind of tri-level half-bridge and suppress the method that the soft switch DC translation circuit of tri-level half-bridge mid-point voltage drifts about.
[background technology]
Tradition tri-level half-bridge soft switch DC translation circuit have topological structure simple, be easy to control, former limit switching tube and can realize advantages such as ZVS, circuit efficiency height, EMI are little, be widely used in three-phase alternating current AC/DC power supply DC converting part.
Conventional P WM type three-level soft switch DC transfer circuit as shown in Figure 1.The transformer original edge clamp circuit that the switching tube clamp circuit that the switch brachium pontis that capacitance partial pressure circuit, switching tube Q1, Q2, Q3, the Q4 that dividing potential drop capacitor C 1, C2 are formed is composed in series, switching tube clamping diode D1, D2 form, transformer clamping diode D3, D4 form, the output circuit that is composed in series by the primary coil of resonant inductance La, capacitance C3 and transformer T1.The switch brachium pontis comprises Q1 connect with the Q4 following brachium pontis of formation of the last brachium pontis that forms and Q3 of connecting with Q2, the mid point of brachium pontis on the termination of switching tube clamp circuit, the mid point of brachium pontis under another termination.The mid point of one termination switch brachium pontis of output circuit, the mid point of another termination switching tube clamp circuit.The mid point of transformer original edge clamp circuit connects the primary coil of transformer T1 and the tie point of resonant inductance.
With PWM type tri-level circuit shown in Figure 1 is example, switching tube Q1, Q2 and Q3, Q4 alternate conduction in next switch periods of ideal situation, and transformer T1 is a bi-directional excitation, its B-H loop symmetry is operated in three-phase limit; But in the practical application, because influences such as the discreteness of practical devices parameter, the asymmetry of layout, control precision, transformer T1 tends to take place the magnetic biasing phenomenon, even causes transformer saturated, integrity problems such as dividing potential drop capacitor C 1, the serious drift of C2 mid-point voltage.
During converter heavy duty work, the existence of capacitance C3 is the power of balance front and back half period delivery well, thereby suppress magnetic biasing and mid-point voltage drift.But under underloading and the idle condition, reduce with primary current, the capacitance effect weakens, and C3 is difficult to effectively to suppress the asymmetric electric current that D1, D2 branch road bring C1, C2 mid point, and the converter operating unbalance can be aggravated.Although this moment, duty was less, transformer T1 is not easy to occur saturated phenomenon, and the drift phenomenon of C1, C2 mid-point voltage can become very outstanding.
In order to solve the integrity problem that the mid point drift brings, common method has at present: thus the voltage difference of the withstand voltage allowance of raising C1, C2, detection C1, C2 is carried out the duty ratio compensation, is regulated C1, C2 load size (dead load or accessory power supply feeder ear) separately etc.These measures often are accompanied by the cost increase, conversion efficiency reduces, designs complicated.
[summary of the invention]
The technical problem to be solved in the present invention provides a kind of simple in structure, and low cost does not need extra control burden, can effectively suppress the method for three-level soft switch DC transfer circuit mid-point voltage drift.
Another technical problem that will solve of the present invention provides a kind of simple in structure, and low cost does not need extra control burden, can effectively suppress the three-level soft switch DC transfer circuit of mid-point voltage drift.
In order to solve the problems of the technologies described above, the technical solution used in the present invention is, the soft switch DC translation circuit of a kind of tri-level half-bridge suppresses the method for mid point drift, the switch change-over device of circuit is connected by the mid point of capacitance with the capacitance partial pressure circuit, the mid point electric current that causes the mid-point voltage drift is accumulated on capacitance formed the direct voltage amount, rely on the voltage of capacitance accumulation, regulate the positive negative sense operating voltage of transformer terminal, the drift value of mid-point voltage is inhibited.
A kind of technical scheme that realizes the soft switch DC translation circuit of tri-level half-bridge of said method, the output circuit that comprises transformer original edge clamp circuit that switching tube clamp circuit that switch brachium pontis that capacitance partial pressure circuit that 2 dividing potential drop electric capacity form, capacitance, 4 switching tubes be composed in series, 2 switching tube clamping diodes form, 2 transformer clamping diodes form, is composed in series by resonant inductance and transformer primary coil; Described switch brachium pontis comprises brachium pontis and following brachium pontis, the mid point of brachium pontis on the termination of described switching tube clamp circuit, the mid point of brachium pontis under another termination; The mid point of one termination switch brachium pontis of described output circuit, the mid point of another termination switching tube clamp circuit, the mid point of described transformer original edge clamp circuit connects the primary coil of transformer, the mid point of one termination capacitor bleeder circuit of described capacitance, the mid point of another termination switching tube clamp circuit.
The soft switch DC translation circuit of above-described tri-level half-bridge, the capacitance of capacitance is less than the capacitance of dividing potential drop electric capacity.
The soft switch DC translation circuit of above-described tri-level half-bridge, the high-pressure side of a termination capacitor bleeder circuit of transformer original edge clamp circuit, the low-pressure end of another termination capacitance partial pressure circuit.
The soft switch DC translation circuit of above-described tri-level half-bridge, the mid point of described resonant inductance one termination transformer original edge clamp circuit, the mid point of another termination switch brachium pontis.
The soft switch DC translation circuit of above-described tri-level half-bridge, the mid point of brachium pontis on the termination of transformer original edge clamp circuit, the mid point of brachium pontis under another termination.
The soft switch DC translation circuit of above-described tri-level half-bridge comprises the clamp impedance, and the mid point of transformer original edge clamp circuit connects the primary coil of transformer by described clamp impedance.
The soft switch DC translation circuit of above-described tri-level half-bridge comprises striding capacitance, and described striding capacitance is in parallel with the switching tube clamp circuit.
The present invention has kept the fundamental characteristics of original traditional tri-level half-bridge soft switch circuit, can also effectively suppress the drift of input capacitance mid-point voltage, and relatively can guarantee to lag behind and turn-off the smooth realization of the soft switch of pipe than the resonant inductance of small sensible weight, duty-cycle loss is little, is the technical scheme of a kind of low cost, high-performance, high reliability.
[description of drawings]
The present invention is further detailed explanation below in conjunction with the drawings and specific embodiments.
Fig. 1 is the circuit diagram of prior art PWM type three-level soft switch DC transfer circuit.
Fig. 2 is the circuit diagram of the soft switch DC translation circuit of tri-level half-bridge of the present invention embodiment 1.
Fig. 3 is the equivalent electric circuit and the current circuit schematic diagram in one stage of pattern in the embodiment of the invention 1.
Fig. 4 is equivalent electric circuit and the current circuit schematic diagram of pattern two-stage in the embodiment of the invention 1.
Fig. 5 is triphasic equivalent electric circuit of pattern and a current circuit schematic diagram in the embodiment of the invention 1.
Fig. 6 is the equivalent electric circuit and the current circuit schematic diagram of pattern quadravalence section in the embodiment of the invention 1.
Fig. 7 is the equivalent electric circuit and the current circuit schematic diagram of pattern five-stage in the embodiment of the invention 1.
Fig. 8 is the equivalent electric circuit and the current circuit schematic diagram in six stages of pattern in the embodiment of the invention 1.
Fig. 9 is the circuit diagram of the soft switch DC translation circuit of tri-level half-bridge of the present invention embodiment 2.[embodiment]
The structure of embodiment 1 three level DC translation circuit is seen Fig. 2, and capacitance C3 directly is connected, and C1=C2＞C3 is arranged with input dividing potential drop capacitor C 1, C2 mid point.On structure, the mid point electric current of any C1 of causing, C2 Voltage unbalance is bound to flow through C3.With C1 to the power of secondary delivery greater than C2, it is example that circuit enters uneven operating state, operating current can net inflow C1, C2 connect mid point, the voltage of C1 can descend gradually, the voltage of C2 can rise gradually, mid-point voltage can produce certain drift.Consider that capacitance C3 capacity is less, the electric current that net inflow C1, C2 connect mid point can add up certain direct voltage fast on capacitance C3, thereby makes circuit when entering new steady-working state, and the drift of the mid-point voltage of C1, C2 is effectively suppressed.
Following several typical modules according to Fig. 3-6 pair circuit working are further analyzed:
Pattern one: energy delivery stage
As shown in Figure 3, switching tube Q1, Q2 conducting, the former limit of transformer T1 forward is excitatory.Identical with conventional P WM tri-level circuit, dividing potential drop capacitor C 1 transmits energy by transformer T1 to secondary.
Pattern two: advance pipe off-phases
As shown in Figure 4, in switching tube Q1 turn off process, its junction capacitance is charged under the acting in conjunction of load current and resonant inductance La energy storage energy.Switching tube Q2 keeps conducting, and the junction capacitance of switching tube Q3, Q4 is discharged along with the charging of switching tube Q1 junction capacitance, the voltage of keeping whole series arm equal dividing potential drop capacitor C 1, C2 voltage and.When switching tube Q1 back-pressure is elevated to C1 and capacitance C3 voltage sum, the conducting of clamping diode D1 clamp.
Pattern three: resonant inductance afterflow stage
As shown in Figure 5, switching tube Q1 is closed by clamping diode D1 clamp and has no progeny, and resonant inductance La is by clamping diode D1, switching tube Q2 afterflow, and the descending slope of resonant inductance La is:
Wherein: V D1, V Q2, VZ are respectively the pressure drop that resonant inductance La freewheel current produces in clamping diode D1, switching tube Q2 and continuous current circuit impedance.
In this process, capacitance does not join the afterflow branch road of La, and the energy of La has only a few part to consume on clamping diode D1, switching tube Q2 and line impedance, and the descending slope of its freewheel current is very low.Before the pipe Q2 that lags behind like this turn-offed, the energy of most resonant inductance La had all kept.
Pattern four: the pipe off-phases lags behind
As shown in Figure 6, in switching tube Q2 turn off process, its junction capacitance is charged under the effect of resonant inductance La freewheel current, and the junction capacitance of switching tube Q3, Q4 continues discharge thereupon.If resonant inductance La energy stored is enough, the junction capacitance voltage of switching tube Q3, Q4 can be put into zero, even continues the afterflow conducting by the body diode of switching tube Q3, Q4 self.
Pattern five: dead band and duty-cycle loss stage
In the Dead Time, resonant inductance La is by the body diode afterflow of switching tube Q3, Q4 self, and drive actuating switch pipe Q3, Q4 and can realize that the no-voltage of switching tube Q3, Q4 is open-minded this moment.
As shown in Figure 7, after switching tube Q3, the Q4 conducting, the electric current that the electric current continuation decay of resonant inductance La and reverse increase are flow through up to the former limit of transformer T1 winding equals the secondary winding and converts back the electric current that former limit is flow through by transformer voltage ratio, and former limit just can begin to secondary delivery energy.This process can be described as duty-cycle loss.
Resonant inductance La can be similar to and regard as under the back-pressure effect that C2 and capacitance C3 apply jointly in the above process, and its current spikes decays to zero and oppositely, and its slope is about:
Wherein: VC2, VC3 are respectively the voltage of C2, C3.Resonant inductance La is big more, and the electric current slope is more little, and duty-cycle loss is big more
Pattern six: oppositely recover the energy clamp stage
The electric current that flows through when the former limit of transformer T1 winding approximates the secondary winding when converting back the electric current that flows through on former limit by transformer voltage ratio, and diode D5, diode D8 turn-off, diode D6, diode D7 conducting, and former limit begins to transmit energy to secondary.Because the reversely restoring process of diode D5, diode D8, resonant inductance La can store certain reverse recovery reduced current more, diode D4 can provide path for this part electric current well, with the voltage clamp on the former limit of transformer, close the peak voltage and the vibration of having no progeny thereby effectively suppress diode D5, diode D8.
Have no progeny when transformer clamping diode D4 electric current drops to zero and closes, switching tube Q3, Q4 continue conducting, and dividing potential drop capacitor C 2 transmits energy by transformer T1 to secondary, enters the operating state with pattern one " symmetry ".
In conjunction with above analysis, we are this several distinguishing features as can be seen:
On the former limit of transformer in the groundwork process that secondary power transmits, capacitance C3 all is operated in the loop of power circuit, the DC voltage component that primary current is accumulated on capacitance C3, the positive negative sense weber of transformer T1 can be effectively regulated, serious magnetic biasing of transformer even the saturated effect of suppressing can be effectively played.
In the resonant inductance afterflow stage, capacitance C3 does not participate in the afterflow branch road, and the energy consumption of resonant inductance La is few, adopts the resonant inductance La than small sensible weight in actual design, and lagging leg just can be realized soft switch.
In pattern five, the formula that changes slope about primary current as can be seen, the resonant inductance sensibility reciprocal that is adopted is more little, the slope of current reversal is big more, duty-cycle loss is more little, the variator fan-out capability is high more.
Main switch change-over device is connected with dividing potential drop capacitor C 1, C2 mid point by capacitance C3, in all working process, causes the mid point current dc component of mid-point voltage drift all can accumulate certain DC voltage component on capacitance C3.Consider the capacity relationship of capacitance C3 and C1, C2, circuit can mainly rely on the voltage of capacitance C3 accumulation, goes to regulate the positive negative sense operating voltage of transformer terminal, make circuit reach new stable state, and the drift value of mid-point voltage is effectively suppressed.The voltage margin of C1, C2 can suitably reduce in the design, helps improving power density, saves cost.
This process is tested, and has verified the correctness and the feasibility of theory analysis.
The present invention is applicable to the soft switch DC converter of tri-level half-bridge based on phase shifting control, and specifically implementing structure can be with reference to shown in Figure 9.Increase striding capacitance Cs on the structure, its two ends connect brachium pontis switching tube mid point and following brachium pontis switching tube mid point on the former limit respectively, in the control former limit switching tube is carried out phase shifting control, can realize tri-level half-bridge soft switch circuit based on phase shifting control, because the existence of striding capacitance Cs, the switch brachium pontis can be realized the man-to-man pressure of changing up and down.With the termination capacitor bleeder circuit C1 of capacitance C3, the mid point of C2, the mid point of another termination switching tube clamp circuit can effectively be controlled the mid-point voltage drift equally, reduces the sensibility reciprocal requirement of resonant inductance La.
The present invention is applicable to that the transformer original edge voltage carries out the tri-level half-bridge soft switch circuit of clamp through a constant impedance, the transformer clamping circuit also can be clamped at the mid point of brachium pontis Q1, Q2 and the mid point of following brachium pontis Q3, Q4 with the direct or logical constant impedance of transformer original edge voltage, as shown in Figure 9.Series connection one constant impedance in the transformer primary voltage nip bit loop, help quickening the rate of decay of resonant inductance excess energy, avoid bringing continuously because of electric current because of the transformer clamping diode integrity problems such as reverse recovery during little duty ratio, the impedance of series connection can be the series-parallel network that resistance, electric capacity or resistance capacitance are formed; Transformer original edge clamp circuit clamped point is placed on the upper and lower bridge arm mid point, and when Q1, Q4 conducting, if ignore its conduction loss, the transformer original edge voltage still is clamped in the input voltage range in fact, but power supply can change to some extent at aspects such as wirings.
The above embodiment of the present invention is except capacitance, main switch change-over device all directly is not connected with dividing potential drop electric capacity mid point, the fundamental characteristics that had both kept original traditional tri-level half-bridge soft switch circuit, can also effectively suppress the drift of input capacitance mid-point voltage, and relatively can guarantee to lag behind and turn-off the smooth realization of the soft switch of pipe than the resonant inductance of small sensible weight, duty-cycle loss is little, is a kind of scheme of low-cost and high-performance high reliability.
Claims (8)
1. the soft switch DC translation circuit of tri-level half-bridge suppresses the method that mid point drifts about, it is characterized in that, the switch change-over device of circuit is connected by the mid point of capacitance with the capacitance partial pressure circuit, the mid point electric current that causes the mid-point voltage drift is accumulated on capacitance formed the direct voltage amount, rely on the voltage of capacitance accumulation, regulate the positive negative sense operating voltage of transformer terminal, the drift value of mid-point voltage is inhibited.
2. soft switch DC translation circuit of tri-level half-bridge of realizing the described method of claim 1, it is characterized in that the output circuit that comprises transformer original edge clamp circuit that switching tube clamp circuit that switch brachium pontis that capacitance partial pressure circuit that 2 dividing potential drop electric capacity form, 4 switching tubes be composed in series, 2 switching tube clamping diodes form, 2 transformer clamping diodes form, is composed in series by resonant inductance and transformer primary coil; Described switch brachium pontis comprises brachium pontis and following brachium pontis, the mid point of brachium pontis on the termination of described switching tube clamp circuit, the mid point of brachium pontis under another termination; The mid point of one termination switch brachium pontis of described output circuit, the mid point of another termination switching tube clamp circuit, the mid point of described transformer original edge clamp circuit connects the primary coil of transformer, it is characterized in that, comprise capacitance, the mid point of one termination capacitor bleeder circuit of described capacitance, the mid point of another termination switching tube clamp circuit.
3. the soft switch DC translation circuit of tri-level half-bridge according to claim 2 is characterized in that the capacitance of capacitance is less than the capacitance of dividing potential drop electric capacity.
4. the soft switch DC translation circuit of tri-level half-bridge according to claim 2 is characterized in that, the high-pressure side of a termination capacitor bleeder circuit of transformer original edge clamp circuit, the low-pressure end of another termination capacitance partial pressure circuit.
5. the soft switch DC translation circuit of tri-level half-bridge according to claim 2 is characterized in that, the mid point of described resonant inductance one termination transformer original edge clamp circuit, the mid point of another termination switch brachium pontis.
6. the soft switch DC translation circuit of tri-level half-bridge according to claim 2 is characterized in that, the mid point of brachium pontis on the termination of transformer original edge clamp circuit, the mid point of brachium pontis under another termination.
7. the soft switch DC translation circuit of tri-level half-bridge according to claim 6 is characterized in that, comprises the clamp impedance, and the mid point of transformer original edge clamp circuit connects the primary coil of transformer by described clamp impedance.
8. the soft switch DC translation circuit of tri-level half-bridge according to claim 2 is characterized in that comprise striding capacitance, described striding capacitance is in parallel with the switching tube clamp circuit.
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102868301A (en) * | 2012-09-10 | 2013-01-09 | 深圳市泰昂能源科技股份有限公司 | Cascade type DC (Direct-Current)/DC convertor for realizing instantaneous voltage-current balance |
| CN103166466A (en) * | 2012-02-15 | 2013-06-19 | 西安胜唐电源有限公司 | Half-bridge three-level direct current converting circuit |
| CN103633850A (en) * | 2013-12-13 | 2014-03-12 | 广东志成冠军集团有限公司 | Half-bridge LLCPFM (liquid level control power factor meter) frequency change circuit and control method thereof |
| CN104506065A (en) * | 2015-01-12 | 2015-04-08 | 佛山市柏克新能科技股份有限公司 | Midpoint potential control method of three-level inverter |
| CN105827127A (en) * | 2015-01-09 | 2016-08-03 | 艾默生网络能源有限公司 | Inverter soft switching control circuit and inverter |
| CN106740195A (en) * | 2016-12-12 | 2017-05-31 | 深圳市八戒电工技术有限公司 | A kind of charging electric vehicle power supply and the charging method to electric automobile |
| CN107769576A (en) * | 2017-11-30 | 2018-03-06 | 郑州云海信息技术有限公司 | A kind of three-level soft switch DC transfer circuit of primary side clamper |
| WO2018209854A1 (en) * | 2017-05-19 | 2018-11-22 | 厦门科华恒盛股份有限公司 | Conversion circuit, corresponding three-phase conversion circuit and conversion device |
| CN109309454A (en) * | 2017-07-28 | 2019-02-05 | 胜美达集团株式会社 | Reduce the circuit and transformer unit of circulating current |
| CN109672329A (en) * | 2018-11-26 | 2019-04-23 | 华为数字技术（苏州）有限公司 | A kind of protection circuit of modular system |
| CN110798086A (en) * | 2019-09-23 | 2020-02-14 | 漳州科华技术有限责任公司 | Three-level soft switching rectifying circuit |
| CN112436780A (en) * | 2020-10-21 | 2021-03-02 | 华为技术有限公司 | Electric drive system, power assembly and electric automobile |
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| CN103166466A (en) * | 2012-02-15 | 2013-06-19 | 西安胜唐电源有限公司 | Half-bridge three-level direct current converting circuit |
| CN102868301B (en) * | 2012-09-10 | 2016-03-30 | 深圳市泰昂能源科技股份有限公司 | Realize the tandem type DC/DC converter of instantaneous voltage current balance type |
| CN102868301A (en) * | 2012-09-10 | 2013-01-09 | 深圳市泰昂能源科技股份有限公司 | Cascade type DC (Direct-Current)/DC convertor for realizing instantaneous voltage-current balance |
| CN103633850A (en) * | 2013-12-13 | 2014-03-12 | 广东志成冠军集团有限公司 | Half-bridge LLCPFM (liquid level control power factor meter) frequency change circuit and control method thereof |
| CN105827127B (en) * | 2015-01-09 | 2020-05-05 | 维谛技术有限公司 | Inverter soft switch control circuit and inverter |
| CN105827127A (en) * | 2015-01-09 | 2016-08-03 | 艾默生网络能源有限公司 | Inverter soft switching control circuit and inverter |
| CN104506065A (en) * | 2015-01-12 | 2015-04-08 | 佛山市柏克新能科技股份有限公司 | Midpoint potential control method of three-level inverter |
| CN106740195A (en) * | 2016-12-12 | 2017-05-31 | 深圳市八戒电工技术有限公司 | A kind of charging electric vehicle power supply and the charging method to electric automobile |
| WO2018209854A1 (en) * | 2017-05-19 | 2018-11-22 | 厦门科华恒盛股份有限公司 | Conversion circuit, corresponding three-phase conversion circuit and conversion device |
| CN109309454A (en) * | 2017-07-28 | 2019-02-05 | 胜美达集团株式会社 | Reduce the circuit and transformer unit of circulating current |
| CN109309454B (en) * | 2017-07-28 | 2023-10-10 | 胜美达集团株式会社 | Circuit for reducing circulating current and transformer unit |
| CN107769576A (en) * | 2017-11-30 | 2018-03-06 | 郑州云海信息技术有限公司 | A kind of three-level soft switch DC transfer circuit of primary side clamper |
| CN109672329A (en) * | 2018-11-26 | 2019-04-23 | 华为数字技术（苏州）有限公司 | A kind of protection circuit of modular system |
| CN110798086A (en) * | 2019-09-23 | 2020-02-14 | 漳州科华技术有限责任公司 | Three-level soft switching rectifying circuit |
| CN112436780A (en) * | 2020-10-21 | 2021-03-02 | 华为技术有限公司 | Electric drive system, power assembly and electric automobile |
| WO2022083220A1 (en) * | 2020-10-21 | 2022-04-28 | 华为数字能源技术有限公司 | Electric drive system, power assembly and electric vehicle |
| CN112436780B (en) * | 2020-10-21 | 2024-03-15 | 华为数字能源技术有限公司 | Electric drive system, power assembly and electric automobile |
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