CN109327140B - Step-up-down circuit - Google Patents
Step-up-down circuit Download PDFInfo
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- CN109327140B CN109327140B CN201811342271.XA CN201811342271A CN109327140B CN 109327140 B CN109327140 B CN 109327140B CN 201811342271 A CN201811342271 A CN 201811342271A CN 109327140 B CN109327140 B CN 109327140B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS 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
- H02M3/00—Conversion of DC power input into DC power output
- H02M3/02—Conversion of DC power input into DC power output without intermediate conversion into AC
- H02M3/04—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters
- H02M3/10—Conversion 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
- H02M3/145—Conversion 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
- H02M3/155—Conversion 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
- H02M3/156—Conversion 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 with automatic control of output voltage or current, e.g. switching regulators
- H02M3/158—Conversion 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 with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
- H02M3/1582—Buck-boost converters
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Abstract
The invention discloses a step-up and step-down circuit, which is different from the existing four-tube BUCK-BOOST step-up and step-down circuit in that an inductor is connected in series between a source electrode of a first switching device and a drain electrode of a second switching device and/or between a drain electrode of a third switching device and a source electrode of a fourth switching device, so that the turn ratio of the circuit in different modes is different.
Description
Technical Field
The present invention relates to a switching power converter circuit, and more particularly to a step-up/step-down circuit having two operation modes of step-up/step-down.
Background
In the fields of solar energy, wind energy, fuel cells, etc., and the fields of wide voltage range input, it is necessary to employ a dc converter having a step-up/step-down characteristic. Because of the wide input voltage range of the power converter, the circuits provided by the prior art with both boost and buck cannot achieve high buck-boost ratios with high or low input voltages and certain duty cycle ranges, even though it may be implemented with other topologies, but increases the complexity, stability, and raw material costs of the system.
The conventional four-switch BUCK-BOOST circuit is shown in fig. 1, and comprises 4 switching devices S1 to S4, an inductor L, an input capacitor C1 and an output capacitor C2.
In the BUCK (BUCK) converter formed by the switching device S1, the switching device S2 and the inductor L in fig. 1, the switching device S2 adopts a MOS tube to replace a diode so as to realize synchronous rectification; the switching device S3, the switching device S4 and the inductor L form a BOOST (BOOST) converter, wherein the switching device S4 adopts a MOS tube to replace a diode so as to realize synchronous rectification. The converters S1 and S3 are used as main control switching devices, so that energy can be transferred from input to output, and the converters S4 and S2 are used as main control switching devices, so that energy can flow bidirectionally, and application of bidirectional power supply conversion can be realized.
The two modes of operation of the circuit of fig. 1 are analyzed as follows:
in BUCK mode, the output voltage is less than the input voltage. In each switching period time t, S4 is normally open, S3 is long closed, S1 and S2 are alternately opened, the input-output voltage ratio and the opening duty ratio D1 of S1 have a relation, under the condition that the switching frequency is fixed, as D1 is reduced, the opening and the closing of the switching device are all time required, when D1 is reduced to a certain value, namely, the time required for opening the switching device is less than the time required for opening the switching device, the switching device S1 cannot be normally opened, and the power supply cannot normally work.
In BOOST mode, the output voltage is greater than the input voltage. In each switching period time t, S1 is normally open, S2 is long closed, S3 and S4 are alternately opened, the input-output voltage ratio and the opening duty ratio D3 of S3 have a relation, and when D3 is increased to a certain value, namely 1-D3 is smaller than the time required by the switching device to be turned off, the switching device S3 cannot be normally turned off, and the power supply cannot normally work.
From the above analysis, the conventional four-tube BUCK-BOOST BUCK-BOOST circuit can realize the output voltage V OUT Less than, equal to, or greater than the input voltage V IN And can also realize the power supply application of bidirectional power conversion. However, in the application environment where the input and output are large transformation ratio, the loss of the switching device becomes large, the efficiency of the power supply system becomes low, and even the voltage conversion function cannot be realized.
The conventional coupling inductor topology is shown in fig. 2 and 3, and each of the coupling inductor topologies comprises 2 switching devices S1 and S2, 2 inductor devices L1 and L2, an input capacitor C1 and an output capacitor C2, and the two inductor devices are coupled together through a magnetic core.
Fig. 2 shows a step-down coupling inductor topology, and for fig. 2, a turn ratio λ= (n1+n2)/n 1 is defined, where the input/output voltage ratio and the turn-on duty ratio D of S1 have a relationship with the turn ratio λ, and the relationship between the input/output voltage ratio and the duty ratio D of a common BUCK is defined as the turn ratio λ is obtained according to a formula, where the same gain M increases, the duty ratio D also increases, and the turn ratio λ is 1. The circuit has the advantages that the turn ratio lambda becomes larger and the duty ratio D becomes larger under the condition of the same input/output voltage ratio, and the problem that a switching device cannot be normally turned on due to the fact that a common 4-switch BUCK-BOOST circuit is reduced along with the reduction of D1 is solved, but the circuit has the defect that a boosting function cannot be realized at the same time.
Fig. 3 shows a BOOST coupling inductor topology, for fig. 3, a turn ratio λ= (n1+n2)/n 1 is defined, where the input/output voltage ratio and the turn-on duty ratio D of S2 have a relationship with the turn ratio λ, and the same gain M can be obtained according to a formula, the turn ratio λ increases, the duty ratio D decreases, and the turn ratio λ is 1, which is a relationship between the input/output voltage ratio of a common BOOST and the duty ratio D. The circuit has the advantages that the turn ratio lambda is increased and the duty ratio D is reduced under the condition of the same input/output voltage ratio, and the problem that a switching device cannot be normally turned off due to the increase of D3 of a common 4-switch BUCK-BOOST circuit is solved. But has the disadvantage that the step-down function cannot be achieved simultaneously.
From the above analysis, the step-down coupling inductor topology shown in fig. 2 can solve the problem that the output is smaller than the requirement of large transformation ratio under the input condition; the boost coupling inductor topology shown in fig. 3 can solve the problem that the output is larger than the large transformation ratio requirement under the input condition. However, both coupling inductor topologies cannot simultaneously realize power supply applications with output voltages less than, equal to, or greater than the input voltage.
In summary, the existing four-switch BUCK-BOOST has the defect that the function of outputting and inputting with a large transformation ratio cannot be realized; the existing coupling inductor topology has the defect that power supply application with output voltage smaller than, equal to or larger than input voltage cannot be realized at the same time.
Disclosure of Invention
In view of the technical defects of the circuit, the technical problem to be solved by the invention is to provide a step-up and step-down circuit which not only can realize power supply application with output voltage smaller than, equal to or larger than input voltage, but also can realize power supply application with output and input in large transformation ratio.
In order to solve the technical problems, the invention concept of the application is as follows: the four-tube BUCK-BOOST circuit is improved on the basis of the traditional four-tube BUCK-BOOST circuit shown in the figure 1, and inductors are connected in series between the source electrode of a first switching device and the drain electrode of a second switching device and between the drain electrode of a third switching device and the source electrode of a fourth switching device, so that the turn ratio of the circuit in different modes is different, when the circuit is in the BUCK mode, the duty ratio of the first switching device is larger when the turn ratio is larger than 1 and is equal to 1 than when the turn ratio is equal to 1, and when the circuit is in the BOOST mode, the duty ratio of the third switching device is smaller when the turn ratio is larger than 1 and is equal to 1, and therefore, the circuit can realize power supply application of which the output voltage is smaller than, equal to or larger than the input voltage and also realize power supply application of which the output and the input are large-change ratio; if the circuit is operating mainly in BUCK mode, it is possible to choose to series-connect an inductance between the source of its first switching device and the drain of the second switching device, and likewise if the circuit is operating mainly in BOOST, it is possible to choose to series-connect an inductance between the drain of the third switching device and the source of the fourth switching device.
Aiming at the inventive concept, the application adopts the following technical scheme:
in a first aspect, an inductance is connected in series between a source of a first switching device and a drain of a second switching device, specifically as follows:
a buck-boost circuit, characterized in that: the power supply comprises an input power supply positive, an output power supply positive, a power supply negative, a first switching device S1, a second switching device S2, a third switching device S3, a fourth switching device S4, a first coupling inductance device L1, a second coupling inductance device L2, a first capacitance device C1 and a second capacitance device C2; the on-current inflow end of the first switching device S1 is connected to the input power source positive and the port one of the first capacitor C1, the on-current outflow end of the first switching device S1 is connected to the port one of the first coupling inductor device L1, the on-current inflow end of the second switching device S2 is connected to the port two of the first coupling inductor device L1 and the port one of the second coupling inductor device L2, the on-current outflow end of the second switching device S2 is connected to the power source negative, the on-current inflow end of the third switching device S3 is connected to the port two of the second coupling inductor device L2, the on-current inflow end of the fourth switching device S4 is connected to the port two of the second coupling inductor device L2, the on-current outflow end of the fourth switching device S4 is connected to the output power source positive and the port one of the second capacitor device C2, the port two of the first capacitor device C1 and the second capacitor device C2 are connected to the power source negative, and the port one of the first coupling inductor device L1 and the port one of the second capacitor device L2 are identical in name.
Preferably, the first coupling inductance device L1 and the second coupling inductance device L2 are coupled to each other by sharing one magnetic core.
Preferably, the number of turns of the first and second coupling inductance devices L1 and L2 is adjustable.
In a second scheme, an inductor is connected in series between the drain electrode of the third switching device and the source electrode of the fourth switching device, and the inductor is specifically as follows:
a buck-boost circuit, characterized in that: the power supply comprises an input power supply positive, an output power supply positive, a power supply negative, a first switching device S1, a second switching device S2, a third switching device S3, a fourth switching device S4, a second coupling inductance device L2, a third coupling inductance device L3, a first capacitance device C1 and a second capacitance device C2; the on-current inflow end of the first switching device S1 is connected to the input power source positive and the port one of the first capacitor C1, the on-current outflow end of the first switching device S1 is connected to the port one of the second coupling inductor device L2, the on-current inflow end of the second switching device S2 is connected to the port one of the second coupling inductor device L2, the on-current outflow end of the second switching device S2 is connected to the power source negative, the on-current inflow end of the third switching device S3 is connected to the port two of the second coupling inductor device L2 and the port one of the third coupling inductor device L3, the on-current inflow end of the third switching device S3 is connected to the port two of the third coupling inductor device L3, the on-current outflow end of the fourth switching device S4 is connected to the output power source positive and the port one of the second capacitor device C2, the port two of the first capacitor device C1 and the second capacitor device C2 are connected to the power source negative, and the port one of the second coupling inductor device L2 and the port one of the third coupling inductor device L2 are identical in name.
Preferably, the second coupling inductance device L2 and the third coupling inductance device L3 are coupled to each other by sharing one magnetic core.
Preferably, the number of turns of the second and third coupling inductance devices L2 and L3 is adjustable.
In a third aspect, inductors are connected in series between the source electrode of the first switching device and the drain electrode of the second switching device, and between the drain electrode of the third switching device and the source electrode of the fourth switching device, and the inductors are specifically as follows:
a buck-boost circuit, characterized in that: the power supply comprises an input power supply positive, an output power supply positive, a power supply negative, a first switching device S1, a second switching device S2, a third switching device S3, a fourth switching device S4, a first coupling inductance device L1, a second coupling inductance device L2, a third coupling inductance device L3, a first capacitance device C1 and a second capacitance device C2; the on-current inflow end of the first switching device S1 is connected to the input power supply positive and the port one of the first capacitor C1, the on-current outflow end of the first switching device S1 is connected to the port one of the first coupling inductor device L1, the on-current inflow end of the second switching device S2 is connected to the port two of the first coupling inductor device L1 and the port one of the second coupling inductor device L2, the on-current outflow end of the second switching device S2 is connected to the power supply negative, the on-current inflow end of the third switching device S3 is connected to the port two of the second coupling inductor device L2 and the port one of the third coupling inductor device L3, the on-current outflow end of the fourth switching device S4 is connected to the port two of the third coupling inductor device L3, the on-current outflow end of the fourth switching device S4 is connected to the output power supply positive and the port one of the second capacitor device C2, the port two of the first capacitor device C1 and the second capacitor device C2 are connected to the power supply negative, and the port one of the first coupling inductor device L1 and the port two of the second capacitor device L2 are identical to the first coupling inductor device L2.
Preferably, the first, second and third coupling inductance devices L1, L2 and L3 are coupled to each other by sharing one magnetic core.
Preferably, the number of turns of the first, second and third coupling inductance devices L1, L2 and L3 is adjustable.
As specific choices of the three technical schemes:
preferably, the first switching device S1, the second switching device S2, the third switching device S3 and the fourth switching device S4 are all MOS transistors; or the first switching device S1 and the third switching device S3 are MOS transistors, and the second switching device S2 and the fourth switching device S4 are diodes or both diodes.
Term interpretation:
the control terminal of the switching device: the port for controlling the switch to be turned on and off, such as the MOS tube, refers to the grid electrode of the MOS tube; by triode, it is meant the base of the triode.
The on-current inflow terminal of the switching device: after the switch is conducted, a port into which current flows, such as a drain electrode of the MOS tube, namely an N channel, a P channel, an enhancement type MOS tube or a depletion type MOS tube, when the switch is conducted, the current flows from the drain electrode with high voltage to the source electrode with low voltage; the triode is referred to as collector of the triode, and when the triode is conducted, current flows from the collector with high voltage to the emitter with low voltage; by diode is meant the anode of the diode.
The on-current outflow end of the switching device: after the switch is turned on, a port from which current flows, for example, for an MOS tube, refers to a source electrode of the MOS tube; for a triode, the emitter of the triode is referred to; by diode is meant the cathode of the diode.
The working principle of the invention is elaborated in the concrete embodiments, and compared with the prior art, the invention has the following beneficial effects:
the buck-boost circuit can realize buck-boost conversion in a wide input voltage range, and widens the application range of the traditional buck-boost circuit.
Drawings
FIG. 1 is a schematic diagram of a conventional 4-switch BUCK-BOOST circuit;
FIG. 2 is one of the schematic block diagrams of a conventional two-way coupled inductor BUCK circuit;
FIG. 3 is a second schematic diagram of a conventional two-way coupled inductor BOOST circuit;
FIG. 4 is a schematic diagram of a first embodiment of the present invention;
FIG. 5 is a graph showing the relationship between the output and input ratios, the turn ratio and the duty cycle in the BUCK mode of the present invention;
FIG. 6 is a graph of output and input ratio, turn ratio and duty cycle in a BOOST mode of the present invention;
FIG. 7 is a schematic diagram of a second embodiment of the present invention;
FIG. 8 is a schematic diagram of a third embodiment of the present invention;
FIG. 9 is a schematic diagram of a fourth embodiment of the present invention;
fig. 10 is a schematic diagram of a fifth embodiment of the present invention.
Detailed Description
For a better understanding of the improvements of the present invention over the prior art, reference is made in detail to the following specific examples.
First embodiment
Fig. 4 shows a schematic diagram of a first embodiment of the invention. The power supply comprises an input power supply positive, an output power supply positive, a power supply negative, a first switching device S1, a second switching device S2, a third switching device S3, a fourth switching device S4, a first coupling inductance device L1, a second coupling inductance device L2, a third coupling inductance device L3, a first capacitance device C1 and a second capacitance device C2; the drain electrode of the first switching device S1 is connected to the input power source positive and the port one of the first capacitor C1, the source electrode of the first switching device S1 is connected to the port one of the first coupling inductor device L1, the drain electrode of the second switching device S2 is connected to the port two of the first coupling inductor device L1 and the port one of the second coupling inductor device L2, the source electrode of the second switching device S2 is connected to the power source negative, the source electrode of the third switching device S3 is connected to the port two of the second coupling inductor device L2 and the port one of the third coupling inductor device L3, the source electrode of the fourth switching device S4 is connected to the port two of the third coupling inductor device L3, the source electrode of the fourth switching device S4 is connected to the output power source positive and the port one of the second capacitor device C2, the port two of the first capacitor device C1 and the second capacitor device C2 are connected to the power source negative, and the port one of the first coupling inductor device L1 and the port one of the third coupling inductor device L2 are identical in name.
In this embodiment, the first coupling inductor L1, the second coupling inductor L2, and the third coupling inductor L3 are coupled to each other by sharing one magnetic core, so that the voltage and current of the three coupling inductors are converted from each other.
In this embodiment, the number of turns of the first, second and third coupling inductance devices L1, L2 and L3 is adjustable, so that the design of turn ratio is realized.
The specific working process of the embodiment is that the BUCK-BOOST circuit can have two working modes of BUCK and BOOST according to the magnitude relation of input voltage and output voltage, the duty ratio of the switching devices S1 and S3 is marked as D1 and D3, and the turn ratio in the BUCK mode is marked as lambda 1 = (n1+n2+n3)/n 3, the turn ratio in BOOST mode is denoted as λ 2 = (n1+n2+n3)/n 2, the input voltage is denoted as Vin, and the output voltage is denoted as Vo.
When the output voltage is smaller than the input voltage, the device works in BUCK mode. During each switching cycle, the switching device S2 is turned off, the switching device S4 is turned on, the switching device S1 and the switching device S3 are alternately turned on, and the input-output voltage ratio is related to the turn ratio lambda and the turn ratio D1 of the switching device S1Fig. 5 is a graph showing the relationship between the turn-on duty ratio D1 and the turn ratio λ1 of the input/output voltage ratios Vo/Vin, S1. As can be seen from fig. 5, under the same ratio of input and output voltages, the duty ratio D1 of the switching device S1 is greater than λ1 when the turn ratio λ1 is greater than 1 and is equal to 1, which solves the problem that the switching device cannot be normally turned on due to the decrease of D1 when the input and output ratio of the common four-switch BUCK-BOOST circuit is large,
when the output voltage is greater than the input voltage, the device operates in the BOOST mode. In each switching cycle time t, the switching device S3 is turned off, the switching device S1 is turned on, the switching device S2 and the switching device S4 are alternately turned on, and the input-output voltage ratio is related to the on duty ratio D2 of the switching device S2Fig. 6 is a graph showing the relationship among the input/output voltage ratio, the on duty ratio D3 of the switching device S3, and the turn ratio λ2. From the figure6 can be seen that under the same ratio of input and output voltages, the duty ratio D3 of the switching device S3 is smaller than that of lambda 2 when the turn ratio lambda 2 is larger than 1 and equal to 1, so that the problem that the switching device cannot be normally turned off due to the fact that the input and output ratio of the common four-switch BUCK-BOOST circuit is increased along with the increase of D3 is solved.
From the above analysis, it is apparent that the present embodiment can achieve the object of the invention.
Second embodiment
Fig. 7 shows a schematic diagram of a second embodiment of the present invention, which is different from the first embodiment in that the high-gain BUCK-BOOST power supply application is realized by changing the second switching tube S2 to a diode as shown in fig. 7 based on the first embodiment.
The power supply has the advantages that one controllable switching device is omitted compared with the first embodiment, and the power supply cost is greatly reduced.
The specific working principle of the second embodiment can be obtained by a person skilled in the art through simple deduction according to the working procedure and principle of the first embodiment, and is not described in detail here.
Third embodiment
Fig. 8 shows a schematic diagram of a second embodiment of the present invention, which is different from the first embodiment in that the high-gain BUCK-BOOST power supply application is realized by changing the fourth switching tube S4 to a diode as shown in fig. 8.
The power supply has the advantages that one controllable switching device is omitted compared with the first embodiment, and the power supply cost is greatly reduced.
The specific working principle of the third embodiment can be obtained by a person skilled in the art through simple deduction according to the working procedure and principle of the first embodiment, and is not described in detail here.
Fourth embodiment
Fig. 9 is a schematic diagram of a second embodiment of the present invention, which is different from the first embodiment in that, based on the first embodiment, the third inductor L3 is removed, so as to implement a high-gain BUCK-BOOST power application.
The method has the advantages that the input and output of the BOOST mode are normal gains, normal transformation ratio is realized, the input and output of the BUCK mode are high gains, and large transformation ratio is realized.
The switching tube S2 and the switching tube S4 can be changed into diodes according to different applications, and the diode has the advantages of reducing the cost of the whole machine and simplifying the control.
The specific working principle of the fourth embodiment can be obtained by a person skilled in the art through simple deduction according to the working procedure and principle of the first embodiment, and is not described in detail here.
Fifth embodiment
A second embodiment of the invention is shown in fig. 10, which differs from the first embodiment in that, on the basis of the first embodiment, a high gain BUCK-BOOST power application is shown by taking out the first inductor L1.
The method has the advantages that the BUCK mode input and output are normal gains, normal transformation ratio is achieved, the BOOST mode input and output are high gains, and large transformation ratio is achieved.
The switching tube S2 and the switching tube S4 can be changed into diodes according to different applications, and the diode has the advantages of reducing the cost of the whole machine and simplifying the control.
The specific working principle of the fifth embodiment can be obtained by a person skilled in the art through simple deduction according to the working procedure and principle of the first embodiment, and is not described in detail here.
The above embodiments should not be taken as limiting the invention, which is defined in the following claims. It will be apparent to those skilled in the art that several modifications and variations can be made in the present invention without departing from the spirit or scope of the invention, such as the switching devices of MOSFET, BJT, IGBT, etc. according to the application; these modifications and finishes are also considered as the protection scope of the present invention, according to the circuit principle and design requirements, by means of simple series-parallel connection of devices, and the like.
Claims (10)
1. A buck-boost circuit, characterized in that: the power supply comprises an input power supply positive, an output power supply positive, a power supply negative, a first switching device S1, a second switching device S2, a third switching device S3, a fourth switching device S4, a first coupling inductance device L1, a second coupling inductance device L2, a first capacitance device C1 and a second capacitance device C2; the on-current inflow end of the first switching device S1 is connected to the input power source positive and the port one of the first capacitor C1, the on-current outflow end of the first switching device S1 is connected to the port one of the first coupling inductor device L1, the on-current inflow end of the second switching device S2 is connected to the port two of the first coupling inductor device L1 and the port one of the second coupling inductor device L2, the on-current outflow end of the second switching device S2 is connected to the power source negative, the on-current inflow end of the third switching device S3 is connected to the port two of the second coupling inductor device L2, the on-current inflow end of the fourth switching device S4 is connected to the port two of the second coupling inductor device L2, the on-current outflow end of the fourth switching device S4 is connected to the output power source positive and the port one of the second capacitor device C2, the port two of the first capacitor device C1 and the second capacitor device C2 are connected to the power source negative, and the port one of the first coupling inductor device L1 and the port one of the second capacitor device L2 are identical in name.
2. The buck-boost circuit of claim 1, wherein: the first coupling inductance device L1 and the second coupling inductance device L2 are coupled to each other by sharing one magnetic core.
3. The buck-boost circuit of claim 1, wherein: the number of turns of the first and second coupling inductance devices L1 and L2 is adjustable.
4. A buck-boost circuit, characterized in that: the power supply comprises an input power supply positive, an output power supply positive, a power supply negative, a first switching device S1, a second switching device S2, a third switching device S3, a fourth switching device S4, a second coupling inductance device L2, a third coupling inductance device L3, a first capacitance device C1 and a second capacitance device C2; the on-current inflow end of the first switching device S1 is connected to the input power source positive and the port one of the first capacitor C1, the on-current outflow end of the first switching device S1 is connected to the port one of the second coupling inductor device L2, the on-current inflow end of the second switching device S2 is connected to the port one of the second coupling inductor device L2, the on-current outflow end of the second switching device S2 is connected to the power source negative, the on-current inflow end of the third switching device S3 is connected to the port two of the second coupling inductor device L2 and the port one of the third coupling inductor device L3, the on-current outflow end of the third switching device S3 is connected to the port two of the third coupling inductor device L3, the on-current outflow end of the fourth switching device S4 is connected to the output power source positive and the port one of the second capacitor device C2, the port two of the first capacitor device C1 and the second capacitor device C2 are connected to the power source negative, and the port one of the second coupling inductor device L2 and the port one of the third coupling inductor device L3 are identical in name.
5. The buck-boost circuit of claim 4, wherein: the second coupling inductance device L2 and the third coupling inductance device L3 are coupled to each other by sharing one magnetic core.
6. The buck-boost circuit of claim 4, wherein: the number of turns of the second and third coupling inductance devices L2 and L3 is adjustable.
7. A buck-boost circuit, characterized in that: the power supply comprises an input power supply positive, an output power supply positive, a power supply negative, a first switching device S1, a second switching device S2, a third switching device S3, a fourth switching device S4, a first coupling inductance device L1, a second coupling inductance device L2, a third coupling inductance device L3, a first capacitance device C1 and a second capacitance device C2; the on-current inflow end of the first switching device S1 is connected to the input power supply positive and the port one of the first capacitor C1, the on-current outflow end of the first switching device S1 is connected to the port one of the first coupling inductor device L1, the on-current inflow end of the second switching device S2 is connected to the port two of the first coupling inductor device L1 and the port one of the second coupling inductor device L2, the on-current outflow end of the second switching device S2 is connected to the power supply negative, the on-current inflow end of the third switching device S3 is connected to the port two of the second coupling inductor device L2 and the port one of the third coupling inductor device L3, the on-current outflow end of the fourth switching device S4 is connected to the port two of the third coupling inductor device L3, the on-current outflow end of the fourth switching device S4 is connected to the output power supply positive and the port one of the second capacitor device C2, the port two of the first capacitor device C1 and the port two of the second capacitor device C2 are connected to the power supply negative, and the port one of the first coupling inductor device L1 and the port two of the first inductor device L2 are identical to the first coupling device L3.
8. The buck-boost circuit of claim 7, wherein: the first, second and third coupling inductance devices L1, L2 and L3 are coupled to each other by sharing one magnetic core.
9. The buck-boost circuit of claim 7, wherein: the number of turns of the first, second and third coupling inductance devices L1, L2 and L3 is adjustable.
10. The step-up/down circuit according to any one of claims 1 to 9, characterized in that: the first switching device S1, the second switching device S2, the third switching device S3 and the fourth switching device S4 are all MOS tubes; or the first switching device S1 and the third switching device S3 are MOS transistors, and the second switching device S2 and the fourth switching device S4 are diodes or both diodes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811342271.XA CN109327140B (en) | 2018-11-13 | 2018-11-13 | Step-up-down circuit |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1014223A (en) * | 1996-06-21 | 1998-01-16 | Sumida Denki Kk | Buck-boost chopper |
| DE102013007056A1 (en) * | 2013-04-23 | 2014-10-23 | Diehl Ako Stiftung & Co. Kg | DC converter |
| TW201820351A (en) * | 2016-11-16 | 2018-06-01 | 邱煌仁 | Three-phase coupled inductor |
| CN209283094U (en) * | 2018-11-13 | 2019-08-20 | 广州金升阳科技有限公司 | A kind of step-up/step-down circuit |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101064462B1 (en) * | 2009-11-17 | 2011-09-15 | 삼성모바일디스플레이주식회사 | DC-DC converter and organic light emitting display device using the same |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1014223A (en) * | 1996-06-21 | 1998-01-16 | Sumida Denki Kk | Buck-boost chopper |
| DE102013007056A1 (en) * | 2013-04-23 | 2014-10-23 | Diehl Ako Stiftung & Co. Kg | DC converter |
| TW201820351A (en) * | 2016-11-16 | 2018-06-01 | 邱煌仁 | Three-phase coupled inductor |
| CN209283094U (en) * | 2018-11-13 | 2019-08-20 | 广州金升阳科技有限公司 | A kind of step-up/step-down circuit |
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