CN104779790A - Switched inductance quasi-Z source DC-DC converter circuit - Google Patents

Switched inductance quasi-Z source DC-DC converter circuit Download PDF

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Publication number
CN104779790A
CN104779790A CN201510107685.4A CN201510107685A CN104779790A CN 104779790 A CN104779790 A CN 104779790A CN 201510107685 A CN201510107685 A CN 201510107685A CN 104779790 A CN104779790 A CN 104779790A
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China
Prior art keywords
inductance
diode
electric capacity
switching tube
circuit
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CN201510107685.4A
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Chinese (zh)
Inventor
杨立强
丘东元
张波
刘潇
张桂东
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South China University of Technology SCUT
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South China University of Technology SCUT
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Priority to CN201510107685.4A priority Critical patent/CN104779790A/en
Publication of CN104779790A publication Critical patent/CN104779790A/en
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    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02MAPPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00Details of apparatus for conversion
    • H02M1/32Means for protecting converters other than automatic disconnection
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02MAPPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00Conversion of dc power input into dc power output
    • H02M3/02Conversion of dc power input into dc power output without intermediate conversion into ac
    • H02M3/04Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
    • H02M3/10Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M3/145Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M3/155Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only

Abstract

The invention provides a switched inductance quasi-Z source DC-DC converter circuit which comprises a voltage source, a first inductor, a first diode, a first capacitor, a switched inductance impedance network, a second capacitor, a switching tube, a fourth inductor, an output capacitor and a load, wherein the switched inductance impedance network consists of a second inductor, a third inductor, a second diode, a third diode and a fourth diode. According to the switched inductance quasi-Z source DC-DC converter circuit, the voltage source, the first inductor, the first capacitor and the switching tube are sequentially connected in series to form a first-stage booster circuit; the second capacitor, the switched inductance impedance network and the switching tube are sequentially connected in series to form a second-stage booster circuit; the fourth inductor, the output capacitor and the load form an output circuit; the whole circuit is simple in structure and free of starting impulse current and transient impulse current generated by the turning on of the switching tube, and has higher output voltage gain and lower capacitance voltage stress, only one switching tube is adopted, power current and load current are both continuous, and common ground for input and output is ensured.

Description

A kind of switched inductors type accurate Z source DC-DC converter circuit
Technical field
The present invention relates to Power Electronic Circuit technical field, be specifically related to a kind of switched inductors type accurate Z source DC-DC converter circuit.
Background technology
In fuel cell and photovoltaic generation, the direct voltage provided due to single solar cell or single fuel cell is lower, generally only have about tens volts, the need for electricity of existing power consumption equipment cannot be met, as needed the high DC input voitage of a few hectovolt in the LED drive circuit of direct current centrally connected power supply, thus often need multiple serial battery to get up to reach required high voltage.But greatly reduce the reliability of whole system so on the one hand, also need the problem solving series average-voltage on the other hand.For this reason, needs can be high-tension high-gain DC-DC converter low voltage transition.The Z source DC-DC converter proposed in recent years is a kind of DC-DC converter with high voltage gain, but this circuit has higher capacitance voltage stress, its capacitance voltage stress is equal with output voltage, and its source current is discontinuous, export and input not altogether, there is very large inrush current problem during circuit start, thus limit the application in practice of this circuit.
Summary of the invention
The object of the invention is to overcome above-mentioned the deficiencies in the prior art, provide a kind of switched inductors type accurate Z source DC-DC converter circuit, concrete technical scheme is as follows.
A kind of switched inductors type accurate Z source DC-DC converter circuit, comprises voltage source, the first inductance, the first diode, the first electric capacity, switched inductors impedance network, the second electric capacity, switching tube, the 4th inductance, output capacitance and load.Described switched inductors impedance network is made up of the second inductance, the 3rd inductance, the second diode, the 3rd diode and the 4th diode; Described voltage source, the first inductance, the first electric capacity and switching tube are followed in series to form first order booster circuit; Described second electric capacity, switched inductors impedance network and switching tube are followed in series to form second level booster circuit; Described 4th inductance, output capacitance and load form output circuit.
Further, the positive pole of described voltage source is connected with one end of the first inductance; The other end of described first inductance is connected with the anode of the first diode and the negative pole of the first electric capacity respectively; The negative electrode of described first diode is connected with the anode of the positive pole of the second electric capacity, one end of the second inductance and the 3rd diode respectively; The other end of described second inductance is connected with the anode of the second diode and the anode of the 4th diode respectively; The negative electrode of described second diode is connected with the negative electrode of the 3rd diode and one end of the 3rd inductance respectively; The negative electrode of described 4th diode is connected with one end of the other end of the 3rd inductance, the positive pole of the first electric capacity, the drain electrode of switching tube and the 4th inductance respectively; The other end of described 4th inductance divides and is connected with the positive pole of output capacitance and one end of load; The negative pole of described voltage source is connected with the source electrode of the negative pole of the second electric capacity, the negative pole of output capacitance, the other end of load and switching tube respectively.
Compared with prior art, circuit tool of the present invention has the following advantages and technique effect: the whole circuit structure of the present invention is simple, and voltage gain is higher, and in circuit, the voltage stress of electric capacity is no more than output voltage; Have good inhibitory action to inrush current, switching tube opens moment, and output capacitance also switch tube can not produce impulse current, improves reliability; And input power electric current and load current are all continuous, export and achieve commonly with input, thus circuit of the present invention is more suitable for being applied in the LED drive power circuit of the technical field of new energy power generation such as fuel cell power generation and photovoltaic generation and direct current centrally connected power supply.
Accompanying drawing explanation
Fig. 1 is a kind of switched inductors type accurate Z source DC-DC converter circuit in the specific embodiment of the invention.
Fig. 2 a, Fig. 2 b are the equivalent circuit diagram of the DC-DC converter circuit of a kind of accurate Z source of switched inductors type shown in Fig. 1 in its switching tube S turn-on and turn-off period respectively.
Fig. 3 a is the comparison diagram of the gain curve of circuit of the present invention and the gain curve of basic booster circuit.
Fig. 3 b is the gain curve of circuit of the present invention in Fig. 3 a and the gain curve of basic booster circuit are less than in 0.4 comparison diagram at duty ratio d.
Fig. 4 is the situation that the voltage of the first electric capacity in circuit of the present invention and the voltage of the second electric capacity change with duty ratio d with the ratio of output voltage respectively.
Fig. 5 is the key operation waveforms figure of example breaker in middle inductive type accurate Z source DC-DC converter circuit.
Embodiment
Be further described specific embodiment of the invention below in conjunction with accompanying drawing, but enforcement of the present invention and protection being not limited thereto, not describing part in detail especially if having below, is all that skilled person can refer to existing techniques in realizing.
With reference to figure 1, a kind of accurate Z source of switched inductors type of the present invention DC-DC converter circuit, it comprises voltage source V i, the first inductance L 1, the first diode D 1, the first electric capacity C 1, the second electric capacity C 2, by the second inductance L 2, the 3rd inductance L 3, the second diode D 2, the 3rd diode D 3with the 4th diode D 4the switched inductors impedance network (as shown in dotted line frame in Fig. 1) formed, switching tube S, the 4th inductance L 4, output capacitance C fwith load R l.A kind of accurate Z source of switched inductors type of the present invention DC-DC converter circuit, described voltage source V i, the first inductance L 1, the first electric capacity C 1first order booster circuit is followed in series to form with switching tube S; Described second electric capacity C 2, switched inductors impedance network and switching tube S be followed in series to form second level booster circuit; Described 4th inductance L 4, output capacitance C fwith load R lform output circuit.During switching tube S conducting, described 3rd diode D 3with the 4th diode D 4equal conducting, described first diode D 1with the second diode D 2all turn off, described voltage source V iwith the first electric capacity C 1together to the first inductance L 1charging energy-storing; Described second electric capacity C 2give the second inductance L respectively 2with the 3rd inductance L 3charging energy-storing; Meanwhile, the second electric capacity C 2with the 4th inductance L 4give output capacitance C together fwith load R lpower supply.When switching tube S turns off, described first diode D 1with the second diode D 2equal conducting, described 3rd diode D 3with the 4th diode D 4all turn off, described voltage source V iwith the first inductance L 1give the second electric capacity C together 2charging energy-storing, forms loop; Inductance in switched inductors impedance network gives the first electric capacity C 1charging energy-storing, forms loop; Meanwhile, voltage source V iwith the first inductance L 1, inductance in switched inductors impedance network is together to the 4th inductance L 4, output capacitance C fwith load R lpower supply, forms loop.Whole circuit structure is simple, only used a switching tube, have higher output voltage gain and lower capacitance voltage stress, source current and load current are all continuous, export and input altogether, and there is not starting current impact in circuit and switching tube opens impulse current problem instantaneously.
The concrete connection of circuit shown in Fig. 1 is as follows: the positive pole of described voltage source is connected with one end of the first inductance; The other end of described first inductance is connected with the anode of the first diode and the negative pole of the first electric capacity respectively; The negative electrode of described first diode is connected with the anode of the positive pole of the second electric capacity, one end of the second inductance and the 3rd diode respectively; The other end of described second inductance is connected with the anode of the second diode and the anode of the 4th diode respectively; The negative electrode of described diode is connected with the negative electrode of the 3rd diode and one end of the 3rd inductance respectively; The negative electrode of described 4th diode is connected with one end of the other end of the 3rd inductance, the positive pole of the first electric capacity, the drain electrode of switching tube and the 4th inductance respectively; The other end of described 4th inductance divides and is connected with the positive pole of output capacitance and one end of load; The negative pole of described voltage source is connected with the source electrode of the negative pole of the second electric capacity, the negative pole of output capacitance, the other end of load and switching tube respectively.
Fig. 2 a, Fig. 2 b give the process chart of circuit of the present invention.Fig. 2 a, Fig. 2 b are the equivalent circuit diagram of switching tube S turn-on and turn-off period respectively, and in figure, solid line represents in converter the part having electric current to flow through, and dotted line represents the part that in converter, no current flows through.
The course of work of the present invention is as follows:
Stage 1, as Fig. 2 a: switching tube S conducting, now the 3rd diode D 3with the 4th diode D 4equal conducting, the first diode D 1with the second diode D 2all turn off.Circuit defines four loops, respectively: voltage source V iwith the first electric capacity C 1give the first inductance L together 1charging energy-storing, forms loop; Second electric capacity C 2to the second inductance L 2carry out charging energy-storing, form loop; Second electric capacity C 2to the 3rd inductance L 3carry out charging energy-storing, form loop; Second electric capacity C 2with the 4th inductance L 4together to output capacitance C fwith load R lpower supply, forms loop.
Stage 2, as Fig. 2 b: switching tube S turns off, now the first diode D 1with diode D 2equal conducting, the 3rd diode D 3with the 4th diode D 4all turn off.Circuit defines three loops, respectively: voltage source V iwith the first inductance L 1give the second electric capacity C together 2charging energy-storing, forms loop; Inductance in switched inductors impedance network gives the first electric capacity C 1charging energy-storing, forms loop; Voltage source V iwith the first inductance L 1, inductance in switched inductors impedance network is together to the 4th inductance L 4, output capacitance C fwith load R lpower supply, forms loop.
To sum up situation, if the conducting duty ratio of switching tube S is d, switch periods is T s.Due to the symmetry of switched inductors impedance network, i.e. the second inductance L 2with the 3rd inductance L 3inductance value equal.Therefore, v is had l2=v l3=v l, v l2and v l3the second inductance L respectively 2with the 3rd inductance L 3voltage, and set v lfor the voltage of inductance in switched inductors impedance network, v l1and v l4be respectively the first inductance L 1with the 4th inductance L 4voltage, V c1and V c2be respectively the first electric capacity C 1with the second electric capacity C 2voltage, v sfor the voltage between switching tube S drain electrode and source electrode.At a switch periods T sin, make output voltage be V o.After converter enters steady operation, draw following voltage relationship derivation.
Switching tube S conduction period, corresponding operative scenario described in the stage 1, therefore has following formula:
v L1=V i+V C1(1)
v L2=v L3=v L=V C2(2)
v L4=v S-V o=-V o(3)
Switching tube S ON time is dT s.
Switching tube S blocking interval, corresponding operative scenario described in the stage 2, therefore has following formula:
v L1=V i-V C2(4)
v L 2 = v L 3 = v L = - 1 2 V C 1 - - - ( 5 )
v S=V C1+V C2(6)
v L4=v S-V o=V C1+V C2-V o(7)
The switching tube S turn-off time is (1-d) T s.
According to the symmetry of above circuit analysis and switched inductors impedance network, respectively to inductance L 1, inductance L 2and inductance L 3use inductance Flux consumption conservation principle, vertical (1), (2) in parallel, (4) and (5) can obtain:
(V i+V C1)dT s+(V i-V C2)(1-d)T s=0 (8)
v C 2 d T s + ( - 1 2 V C 1 ) 1 ( 1 - d ) T s = 0 - - - ( 9 )
Thus, the first electric capacity C can be obtained 1voltage V c1with the second electric capacity C 2voltage V c2respectively with voltage source V ibetween relational expression be:
V C 1 = 2 d 1 - 2 d - d 2 V i - - - ( 10 )
V C 2 = 1 - d 1 - 2 d - d 2 V i - - - ( 11 )
Convolution (3) and (7), and to the 4th inductance L 4application inductance Flux consumption conservation principle, can obtain:
(-V o)dT s+(V C1+V C2-V o)(1-d)T s=0 (12)
Wushu (10) and (11) substitute into formula (12), and the gain factor expression formula that can obtain circuit of the present invention is:
G = V o V i = 1 - d 2 1 - 2 d - d 2 - - - ( 13 )
Make again voltage V sfor drain electrode when switching tube S turns off and the voltage between source electrode, then had by formula (6), (10) and (11):
V S = V C 1 + V C 2 = 1 + d 1 - 2 d - d 2 V i - - - ( 14 )
From the denominator of formula (10), (11), (13) and (14), the working range of the conducting duty ratio d of circuit breaker in middle pipe S of the present invention can not more than 0.414.Be the comparison diagram that the gain curve of circuit of the present invention and the gain curve of basic booster circuit change with duty ratio d as shown in Figure 3 a; Fig. 3 b is the gain curve of circuit gain curve of the present invention and basic booster circuit in Fig. 3 a is less than in the scope of 0.4 comparison diagram at duty ratio d, and in figure, solid line represents the gain curve of circuit of the present invention, and dotted line represents the gain curve of basic booster circuit.As seen from the figure, circuit of the present invention is when duty ratio d is no more than 0.4, and gain G just can reach very high.Therefore, by contrast, the gain of circuit of the present invention is higher.
The voltage V of the first electric capacity in circuit of the present invention can be obtained by formula (10), (11) and (13) c1with the voltage V of the second electric capacity c2respectively with output voltage V orelational expression be:
V C 1 = 2 d 1 - d 2 V o - - - ( 15 )
V C 2 = 1 1 + d V o - - - ( 16 )
As Fig. 4 gives the voltage V of the first electric capacity in circuit of the present invention c1with the voltage V of the second electric capacity c2respectively with output voltage V oratio situation about changing with duty ratio d.In figure, solid line represents the voltage V of the first electric capacity c1with output voltage V othe curve that changes with duty ratio d of ratio; Dotted line represents the voltage V of the second electric capacity c2with output voltage V othe curve that changes with duty ratio d of ratio.As can be seen from Figure, capacitance voltage V c1and V c2maximum in the permission working range of duty ratio d, all can not exceed output voltage V o.Therefore, the capacitance voltage stress ratio in circuit of the present invention is lower.
Be illustrated in figure 5 main oscillogram during circuit working of the present invention, V in figure gfor the driving of switching tube, i l1, i l2, i l3and i l4be respectively the first inductance L 1, the second inductance L 2, the 3rd inductance L 3with the 4th inductance L 4electric current.Due to inductance L 1electric current be source current, inductance L 4electric current be load current, so as can be seen from Figure, source current and load current are all continuous print.
In addition, due to the topological structure of circuit of the present invention own, when it starts, the first inductance L 1with the second inductance L in switched inductors impedance network 2with the 3rd inductance L 3there is inhibitory action to inrush current, be conducive to the soft start of converter, decrease the impact damage to device; In like manner, due to the 4th inductance L 4existence, so switching tube open moment, output capacitance switch tube can not cause rush of current.
In sum, circuit of the present invention has higher voltage gain and lower capacitance voltage stress, and only used a switching tube, source current and load current are all continuous, export with input altogether, and there is not the impulse current that inrush current and switching tube open moment.
Above-described embodiment is the present invention's preferably execution mode; but embodiments of the present invention are not limited by the examples; change, the modification done under other any does not deviate from Spirit Essence of the present invention and principle, substitute, combine, simplify; all should be the substitute mode of equivalence, be included within protection scope of the present invention.

Claims (3)

1. a switched inductors type accurate Z source DC-DC converter circuit, is characterized in that comprising voltage source (V i), the first inductance (L 1), the first diode (D 1), the first electric capacity (C 1), the second electric capacity (C 2), switched inductors impedance network, switching tube (S), the 4th inductance (L 4), output capacitance (C f) and load (R l); Described switched inductors impedance network is by the second inductance (L 2), the 3rd inductance (L 3), the second diode (D 2), the 3rd diode (D 3) and the 4th diode (D 4) form; Described voltage source (V i), the first inductance (L 1), the first electric capacity (C 1) and switching tube (S) be followed in series to form first order booster circuit; Described second electric capacity (C 2), switched inductors impedance network and switching tube (S) be followed in series to form second level booster circuit; Described 4th inductance (L 4), output capacitance (C f) and load (R l) form output circuit.
2. a kind of accurate Z source of switched inductors type according to claim 1 DC-DC converter circuit, is characterized in that described voltage source (V i) positive pole and the first inductance (L 1) one end connect; Described first inductance (L 1) the other end respectively with the first diode (D 1) anode and the first electric capacity (C 1) negative pole connect; Described first diode (D 1) negative electrode respectively with the second electric capacity (C 2) positive pole, the second inductance (L 2) one end and the 3rd diode (D 3) anode connect; Described second inductance (L 2) the other end respectively with the second diode (D 2) anode and the 4th diode (D 4) anode connect; Described second diode (D 2) negative electrode respectively with the 3rd diode (D 3) negative electrode and the 3rd inductance (L 3) one end connect; Described 4th diode (D 4) negative electrode respectively with the 3rd inductance (L 3) the other end, the first electric capacity (C 1) positive pole, the drain electrode of switching tube (S) and the 4th inductance (L 4) one end connect; Described 4th inductance (L 4) the other end respectively with output capacitance (C f) positive pole and load (R l) one end connect; Described voltage source (V i) negative pole respectively with the second electric capacity (C 2) negative pole, output capacitance (C f) negative pole, load (R l) the other end be connected with the source electrode of switching tube (S).
3. a kind of accurate Z source of switched inductors type according to claim 1 DC-DC converter circuit, is characterized in that:
When switching tube (S) conducting, described 3rd diode (D 3) and the 4th diode (D 4) all conductings, described first diode (D 1) and the second diode (D 2) all turn off, voltage source (V i) and the first electric capacity (C 1) together to the first inductance (L 1) charging energy-storing; Described second electric capacity (C 2) respectively to the second inductance (L 2) and the 3rd inductance (L 3) charging energy-storing; Meanwhile, the second electric capacity (C 2) and the 4th inductance (L 4) give output capacitance (C together f) and load (R l) power supply;
When switching tube (S) turns off, described first diode (D 1) and the second diode (D 2) all conductings, described 3rd diode (D 3) and the 4th diode (D 4) all turn off, described voltage source (V i) and the first inductance (L 1) give the second electric capacity (C together 2) charging energy-storing, form loop; Inductance in switched inductors impedance network gives the first electric capacity (C 1) charging energy-storing, form loop; Meanwhile, voltage source (V i) and the first inductance (L 1), inductance in switched inductors impedance network gives the 4th inductance (L together 4), output capacitance (C f) and load (R l) power supply.
CN201510107685.4A 2015-03-12 2015-03-12 Switched inductance quasi-Z source DC-DC converter circuit Pending CN104779790A (en)

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Cited By (7)

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TWI569566B (en) * 2015-12-24 2017-02-01 遠東科技大學 High voltage gain power converter
CN106602872A (en) * 2016-12-14 2017-04-26 华南理工大学 Cascaded voltage lifting quasi-Z source converter
CN106787692A (en) * 2017-01-16 2017-05-31 华南理工大学 A kind of quasi- Z source converters of type switching capacity altogether
CN107346939A (en) * 2017-05-04 2017-11-14 北京信息科技大学 A kind of new quasi- Z sources DC/DC converters
CN107565814A (en) * 2017-09-30 2018-01-09 华南理工大学 A kind of quasi- Z source switch boosting inverters of high-gain suitable for fuel cell power generation
CN113258772A (en) * 2021-05-11 2021-08-13 西安科技大学 Secondary buck-boost converter adopting switch inductor
CN113328616A (en) * 2021-04-30 2021-08-31 广州金升阳科技有限公司 Valley filling circuit

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TWI569566B (en) * 2015-12-24 2017-02-01 遠東科技大學 High voltage gain power converter
CN106602872A (en) * 2016-12-14 2017-04-26 华南理工大学 Cascaded voltage lifting quasi-Z source converter
CN106787692A (en) * 2017-01-16 2017-05-31 华南理工大学 A kind of quasi- Z source converters of type switching capacity altogether
CN107346939A (en) * 2017-05-04 2017-11-14 北京信息科技大学 A kind of new quasi- Z sources DC/DC converters
CN107565814A (en) * 2017-09-30 2018-01-09 华南理工大学 A kind of quasi- Z source switch boosting inverters of high-gain suitable for fuel cell power generation
CN113328616A (en) * 2021-04-30 2021-08-31 广州金升阳科技有限公司 Valley filling circuit
CN113258772A (en) * 2021-05-11 2021-08-13 西安科技大学 Secondary buck-boost converter adopting switch inductor

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