CN211830581U - High-transformation-ratio bidirectional direct current conversion circuit - Google Patents
High-transformation-ratio bidirectional direct current conversion circuit Download PDFInfo
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- CN211830581U CN211830581U CN202020403765.0U CN202020403765U CN211830581U CN 211830581 U CN211830581 U CN 211830581U CN 202020403765 U CN202020403765 U CN 202020403765U CN 211830581 U CN211830581 U CN 211830581U
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Abstract
The utility model relates to a two-way direct current converting circuit of high transformation ratio, including switching device S1, switching device S2, switching device S3, switching device S4, electric capacity C1, electric capacity C2, electric capacity C3, electric capacity C4, inductance L1, inductance L2, inductance L3, inductance L4, diode D1, diode D2 constitute. The common terminal and the input U of the switching device S1INIs connected to the common connection point of the capacitor C1; the switching device S2, the switching device S3, the inductor L1, the switching device S4, the capacitor C2 and the inductor L2Are connected with each other; the switching device S3 and the switching device S4 are connected with the inductor L4 and the diode D2; the capacitor C1 and the DC input UINIn parallel, capacitor C4 and output UOUTAnd (4) connecting in parallel. The bidirectional conversion function of the circuit is realized by controlling different states of the switching device S1, the switching device S2, the switching device S3 and the switching device S4. The circuit has simple structure and strong transformation capability, and is suitable for wide-range bidirectional electric energy transformation occasions.
Description
Technical Field
The utility model relates to a two-way power conversion technology field especially relates to a two-way DC conversion circuit, and specific theory relates to a two-way DC conversion circuit of high transformation ratio.
Background
The bidirectional direct current conversion circuit can realize bidirectional conversion of electric energy, that is, a bidirectional power conversion function from an input end to an output end (forward direction) or from the output end to the input end. The method is widely applied to projects such as new energy storage and the like, for example, the forward conversion of electric energy is needed when the storage battery is charged, and the direct current conversion function from a charging input end to a storage battery end is realized; when the storage battery discharges, the reverse conversion of electric energy is needed, and the function of direct current conversion from the storage battery end to the output end is realized. The bidirectional conversion circuit commonly used in the existing engineering comprises a Buck/Boost circuit and a bidirectional active bridge type conversion circuit DAB, wherein the Buck/Boost bidirectional conversion circuit is formed based on a classical equivalent Buck and Boost circuit, the input/output voltage conversion ratio of the Buck and Boost circuit in the engineering application is limited, and the conversion range is limited. In order to expand the conversion range, a bidirectional active bridge conversion circuit DAB can be adopted, the DAB consists of a bridge conversion circuit and a high-frequency transformer, the conversion ratio of input/output voltage can be adjusted according to the conversion ratio of the high-frequency transformer, and large conversion ratio can be made.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a high transformation ratio two-way direct current converting circuit of simple structure, low cost and easy control implementation is applicable to new forms of energy engineering occasions such as wide range solar photovoltaic energy storage.
In order to achieve the above object, the present invention adopts the technical solution that a high transformation ratio bidirectional dc conversion circuit comprises first to fourth switching devices, first to fourth capacitors, first to fourth inductors, and first to second diodes, one end of the first switching device is connected to a positive terminal of a dc input, the other end is connected to a negative terminal of the first diode, the positive terminal and the negative terminal of the dc input are connected in parallel with the first capacitor, the positive terminal of the first diode is connected to a negative terminal of the dc input, the first inductor, the second inductor, and the fourth inductor are sequentially connected in series, the first inductor is connected to the first switching device, the fourth inductor is connected to a positive terminal of a dc output, two ends of the second switching device are respectively connected to the positive terminals of the first inductor and the first diode, the fourth switching device is connected in series between the second inductor and the fourth inductor, one end of the third switching device is connected between the first inductor and the second inductor, the other end of the third switch device is connected between the fourth inductor and the fourth switch device, one end of the third inductor is connected with the second switch device, the other end of the third inductor is connected with the anode of the second diode, the cathode of the second diode is connected between the fourth switch device and the fourth inductor, one end of the second capacitor is connected between the first inductor and the second inductor, the other end of the second capacitor is connected between the third inductor and the anode of the second diode, one end of the third capacitor is connected between the second inductor and the fourth switch device, the other end of the third capacitor is connected between the third inductor and the second switch device, and the fourth capacitor is connected with the anode end and the cathode end of the direct current output in parallel; the bidirectional conversion function of the circuit is realized by controlling different states of the first to fourth switching devices.
As an improvement of the present invention, different states of the first to fourth switching devices are controlled by PWM signals.
As an improvement of the present invention, the first switch device, the first diode, the first inductor, the second switch device, the second inductor, the third inductor, the second capacitor, the third capacitor, the fourth switch device, the second diode, and the fourth inductor form a bidirectional buck-boost circuit with a high transformation ratio; the high-transformation-ratio voltage reduction forward conversion circuit is composed of a first switch device, a first diode, a first inductor, a second inductor, a fourth switch device, a second diode and a fourth inductor, and the high-transformation-ratio voltage reduction reverse conversion circuit is composed of a fourth capacitor, a fourth inductor, a fourth switch device, a second inductor, a third inductor, a second capacitor, a third capacitor, a second switch device, a first inductor and a first diode.
As an improvement of the present invention, when the high transformation ratio voltage reduction forward conversion circuit works, the first switching device and the fourth switching device are controlled by PWM signals, and the transformation of different voltage reduction ratios can be realized by adjusting the duty ratios d1 and d4 of the respective control signals PWM; when the high-conversion-ratio boost reverse conversion circuit works, the second switching device is controlled by the PWM signal, and the boost conversion ratio can be adjusted through the adjusted duty ratio d2 of the PWM control signal.
As an improvement of the present invention, the first switch device, the first diode, the first inductor, the second switch device, the third switch device, the second diode and the fourth inductor form a conventional bidirectional buck-boost circuit; the conventional step-down forward conversion circuit is composed of a first switch device, a first diode, a first inductor, a second switch device, a third switch device and a fourth inductor, and the conventional step-up reverse conversion circuit is composed of the fourth inductor, the third switch device, the second switch device, the first inductor and the first diode.
As an improvement of the present invention, when the conventional step-down forward conversion circuit works, the first switching device is controlled by the PWM signal, and the step-down conversion ratio can be adjusted by adjusting the PWM control signal duty ratio d1 of the first switching device; when the conventional boost reverse conversion circuit works, the second switching device is controlled by the PWM signal, and the boost conversion ratio can be adjusted by adjusting the duty ratio d2 of the PWM control signal of the second switching device.
As an improvement of the utility model, control disconnection first switching device, third switching device and fourth switching device, whole converting circuit gets into the protection state.
Compared with the prior art, the utility model discloses a circuit overall structure design is ingenious, simple structure, easily realizes and controls, can realize the two-way electric energy conversion function of high transformation ratio through controlling the different states of first to fourth switching device, adopts the duty ratio regulation control of PWM signal to the different states of first to fourth switching device, can satisfy the direct current electric energy conversion under the different transformation ratio condition, and the transformation ability is strong, can be fit for the two-way electric energy conversion occasion application and popularization in the wide range; in addition, when the parameter abnormity is detected, the first switching device, the third switching device and the fourth switching device are disconnected by sending a protection control instruction, so that the whole conversion circuit enters a protection state, and the use safety is greatly improved.
Drawings
Fig. 1 shows a high transformation ratio bidirectional dc conversion circuit of the present invention.
Fig. 2 is an equivalent high transformation ratio step-down forward conversion circuit of the present invention.
Fig. 3 is the equivalent high transformation ratio boost reverse conversion circuit of the present invention.
Fig. 4 is the equivalent conventional transformation ratio step-down forward conversion circuit of the present invention.
Fig. 5 is an equivalent conventional transformation ratio boost reverse conversion circuit of the present invention.
Fig. 6 is a flow chart of a control method of the high transformation ratio bidirectional dc conversion circuit of the present invention.
Detailed Description
For the purposes of promoting an understanding and appreciation of the invention, the invention will be further described and illustrated in connection with the accompanying drawings.
As shown in fig. 1, a high conversion ratio bidirectional dc conversion circuit includes a first switching device S1, a second switching device S2, a third switching device S3, a fourth switching device S4, a first capacitor C1, a second capacitor C2, a third capacitor C3, a fourth capacitor C4, a first inductor L1, a second inductor L2, a third inductor L3, a fourth inductor L4, a first diode D1, and a second diode D2, wherein the first switching device S1, the second switching device S2, the third switching device S3, and the fourth switching device S4 may be formed by power devices such as IGBTs, MOSFETs, and SiC (silicon carbide), and the first capacitor C1, the second capacitor C367, the third capacitor C3, the fourth capacitor C4, the first inductor L4, the second inductor L4, the third inductor L4, and the fourth inductor L4 are selected according to the conversion ratio of the power conversion range. The common terminal and the input U of the first switching device S1INIs connected to the common connection point of the first capacitor C1. The second switching device S2, the third switching device S3 andthe common terminal of the first inductor L1, the fourth switching device S4, the second capacitor C2 and the second inductor L2 is connected. The third switching device S3 and the fourth switching device S4 are connected to the fourth inductor L4 and the second diode D2. The first capacitor C1 and the DC input UINIn parallel, the fourth capacitor C4 and the output UOUTAnd (4) connecting in parallel. The PWM control signal is used for controlling different states of the first switching device S1, the second switching device S2, the third switching device S3 and the fourth switching device S4, and the bidirectional conversion function of the circuit is achieved.
Preferably, the first switching device S1, the first diode D1, the first inductor L1, the second switching device S2, the second inductor L2, the third inductor L3, the second capacitor C2, the third capacitor C3, the fourth switching device S4, the second diode D2 and the fourth inductor L4 form a high-transformation-ratio bidirectional buck-boost circuit, the transformation ratio value of the circuit is mainly related to the duty ratio of the PWM control signals of the switching devices, and the transformation ratio value of the circuit can be changed by adjusting the duty ratio of the PWM control signals. The high-transformation-ratio step-down forward conversion circuit is composed of a first switching device S1, a first diode D1, a first inductor L1, a second inductor L2, a fourth switching device S4, a second diode D2 and a fourth inductor L4. The boost inverse transformation circuit with high transformation ratio is composed of a fourth capacitor C4, a fourth inductor L4, a fourth switching device S4, a second inductor L2, a third inductor L3, a second capacitor C2, a third capacitor C3, a second switching device S2, a first inductor L1 and a first diode D1. When the high-transformation-ratio voltage-reducing forward conversion circuit works, the first switching device S1 and the fourth switching device S4 are controlled by PWM signals, and the transformation of different voltage-reducing ratios can be realized by adjusting the duty ratios d1 and d4 of respective control signals PWM. When the high-transformation-ratio boost reverse conversion circuit works, the second switching device S2 is controlled by a PWM signal, and the boost conversion ratio can be adjusted by adjusting the duty ratio d2 of the PWM control signal of the second switching device S2.
Preferably, the first switch device S1, the first diode D1, the first inductor L1, the second inductor L2, the second switch device S2, the third switch device S3, the second diode D2 and the fourth inductor L4 form a conventional bidirectional buck-boost circuit. The conventional buck forward conversion circuit is composed of a first switching device S1, a first diode D1, a first inductor L1, a second inductor L2, a second switching device S2, a third switching device S3 and a fourth inductor L4. The conventional boost reverse conversion circuit is composed of a fourth inductor L4, a third switching device S3, a second switching device S2, a first switching device S1, a first inductor L1 and a first diode D1. When the conventional voltage reduction forward conversion circuit works, the first switching device S1 is controlled by a PWM signal, and the voltage reduction conversion ratio can be adjusted by adjusting the duty ratio d1 of the PWM control signal of the first switching device S1; when the conventional boost reverse conversion circuit works, the second switching device S2 is controlled by the PWM signal, and the boost conversion ratio can be adjusted by adjusting the duty ratio d2 of the PWM control signal of the second switching device S2.
As shown in fig. 2-5, they are equivalent composition diagrams under different working modes of the present invention. Fig. 2 is an equivalent high transformation ratio step-down forward conversion circuit, which is composed of a first switching device S1, a first diode D1, a first inductor L1, a second inductor L2, a fourth switching device S4, a second diode D2, and a fourth inductor L4, and can implement high transformation ratio step-down operation, and the input end U is connected to the input end U4INOutput to U after reducing the voltage according to the requirementOUTAnd (4) an end.
Fig. 3 is an equivalent high transformation ratio boost inverting conversion circuit, which includes a fourth capacitor C4, a fourth inductor L4, a fourth switching device S4, a second inductor L2, a third inductor L3, a second capacitor C2, a third capacitor C3, a second switching device S2, a first inductor L1, and a first diode D1, and can implement high transformation ratio boost operation, and output end U is connected to output end U through a first diode D1OUTBoosting as required and then outputting to UINAnd (4) an end.
Fig. 4 is an equivalent conventional transformation ratio step-down forward conversion circuit, which is composed of a first switching device S1, a first diode D1, a first inductor L1, a second inductor L2, a second switching device S2, a third switching device S3 and a fourth inductor L4, and can realize the step-up operation of the conventional transformation ratio, and the output end of the conventional transformation ratio step-down forward conversion circuit is connected to the output end of the conventional transformation ratio step-down forward conversion circuitOUTBoosting as required and then outputting to UINAnd (4) an end.
FIG. 5 shows an equivalent conventional transformation ratio boost reverse transformation circuit, which comprises a fourth inductor L4, a third switching device S3, a second switching device S2, and a third switching deviceA switching device S1, a first inductor L1, and a first diode D1 constitute a conventional boost-up reverse conversion circuit, and the output end of the circuit is connected to a power supplyOUTBoosting as required and then outputting to UINAnd (4) an end.
As shown in fig. 6, a flow of the operation of the control method for the high transformation ratio DC/DC converter circuit includes the following specific steps:
step 1: the voltage conversion direction is read respectively, specifically, a controller used in the circuit analyzes an input set command so as to judge the voltage conversion direction and the input voltage U required to be convertedIN_ref(as settable parameter value) and output voltage value UOUT_ref(is a settable parameter value);
step 2: calculation input UIN_refAnd an output voltage value UOUT_refDifference | U betweenIN-OUT|；
And step 3: the | U to be calculatedIN-OUT| and a set value UD-SETComparing, if the comparison result is larger than a set value, adopting a high transformation ratio equivalent circuit working mode, otherwise adopting a conventional transformation circuit working mode;
and 4, step 4: entering corresponding equivalent transformation circuit states (including a high transformation ratio forward transformation state, a high transformation ratio reverse transformation state, a conventional transformation ratio forward transformation state and a conventional transformation ratio reverse transformation state) according to the transformation direction in the step 1 and the working mode in the step 3, specifically: if the control voltage enters a high-ratio state, the corresponding control voltage is converted into the formula (1)
If entering the regular transformation ratio state, the corresponding control voltage is transformed into the formula (2)
U in formulae (1) and (2)INIs the voltage at the terminal of the first capacitor C1, UOUTD1, d2 and d4 are the first switching device S1 and the second switching device S1 respectively for the voltage at the end of the fourth capacitor C4S2 and a fourth switching device S4.
And 5: and (4) performing corresponding control according to the control mode (namely PWM control) determined in the step (4) and the control signal value (namely the duty ratio value of the PWM control signal of the corresponding switching device), entering a protection state if the detected parameters are abnormal (such as short circuit and overcurrent of the load, input overvoltage, overhigh working temperature of the device and the like), and sending a protection control command to open the first switching device S1, the third switching device S3 and the fourth switching device S4.
The technical means disclosed by the scheme of the present invention is not limited to the technical means disclosed by the above embodiments, but also includes the technical scheme formed by the arbitrary combination of the above technical features. It should be noted that, for those skilled in the art, without departing from the principle of the present invention, several improvements and modifications can be made, and these improvements and modifications are also considered as the protection scope of the present invention.
Claims (7)
1. A high transformation ratio bidirectional direct current conversion circuit is characterized in that: the direct current input circuit comprises first to fourth switching devices, first to fourth capacitors, first to fourth inductors and first to second diodes, wherein one end of the first switching device is connected with a positive end of a direct current input, the other end of the first switching device is connected with a negative electrode of the first diode, the positive end and the negative end of the direct current input are connected with the first capacitor in parallel, a positive electrode of the first diode is connected with a negative end of the direct current input, the first inductor, the second inductor and the fourth inductor are sequentially connected in series, the first inductor is connected with the first switching device, the fourth inductor is connected with a positive end of a direct current output, two ends of the second switching device are respectively connected with a positive electrode of the first inductor and a positive electrode of the first diode, the fourth switching device is connected between the second inductor and the fourth inductor in series, one end of the third switching device is connected between the first inductor and the second inductor, the other end of the third switching device is connected between the fourth inductor and the fourth switching device, one end of a third inductor is connected with a second switching device, the other end of the third inductor is connected with the anode of a second diode, the cathode of the second diode is connected between a fourth switching device and a fourth inductor, one end of a second capacitor is connected between the first inductor and the second inductor, the other end of the second capacitor is connected between the third inductor and the anode of the second diode, one end of the third capacitor is connected between the second inductor and the fourth switching device, the other end of the third capacitor is connected between the third inductor and the second switching device, and the fourth capacitor is connected in parallel with the anode end and the cathode end of the direct current output; the bidirectional conversion function of the circuit is realized by controlling different states of the first to fourth switching devices.
2. A high conversion ratio bidirectional dc converter circuit as recited in claim 1 wherein different states of said first through fourth switching devices are controlled by PWM signals.
3. The high-conversion-ratio bidirectional direct-current conversion circuit as claimed in claim 2, wherein the first switching device, the first diode, the first inductor, the second switching device, the second inductor, the third inductor, the second capacitor, the third capacitor, the fourth switching device, the second diode and the fourth inductor form a high-conversion-ratio bidirectional buck-boost circuit; the high-transformation-ratio voltage reduction forward conversion circuit is composed of a first switch device, a first diode, a first inductor, a second inductor, a fourth switch device, a second diode and a fourth inductor, and the high-transformation-ratio voltage reduction reverse conversion circuit is composed of a fourth capacitor, a fourth inductor, a fourth switch device, a second inductor, a third inductor, a second capacitor, a third capacitor, a second switch device, a first inductor and a first diode.
4. A high transformation ratio bidirectional DC conversion circuit as claimed in claim 3, wherein when the high transformation ratio buck forward conversion circuit is in operation, the first switching device and the fourth switching device are controlled by PWM signals, and the conversion of different buck ratios can be realized by adjusting the duty ratios d1 and d4 of the respective control signals PWM; when the high-conversion-ratio boost reverse conversion circuit works, the second switching device is controlled by the PWM signal, and the boost conversion ratio can be adjusted through the adjusted duty ratio d2 of the PWM control signal.
5. A high-conversion-ratio bidirectional DC converter circuit as recited in claim 4 wherein said first switching device, first diode, first inductor, second switching device, third switching device, second diode and fourth inductor form a conventional bidirectional buck-boost circuit; the conventional voltage reduction forward conversion circuit is composed of a first switch device, a first diode, a first inductor, a second switch device, a third switch device and a fourth inductor, and the conventional voltage boost reverse conversion circuit is composed of the fourth inductor, the third switch device, the second switch device, the first inductor and the first diode.
6. A high conversion ratio bidirectional DC conversion circuit as recited in claim 5 wherein, when said normal buck forward conversion circuit is in operation, the first switching device is controlled by the PWM signal, and the buck conversion ratio is adjusted by adjusting the duty cycle d1 of the PWM control signal of the first switching device; when the conventional boost reverse conversion circuit works, the second switching device is controlled by the PWM signal, and the boost conversion ratio can be adjusted by adjusting the duty ratio d2 of the PWM control signal of the second switching device.
7. A high conversion ratio bidirectional DC converter circuit as recited in claim 6 wherein the first switching device, the third switching device and the fourth switching device are controlled to be turned off, and the whole converter circuit enters a protection state.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114337253A (en) * | 2021-12-30 | 2022-04-12 | 电子科技大学 | High-transformation-ratio scalable DC-DC converter |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114337253A (en) * | 2021-12-30 | 2022-04-12 | 电子科技大学 | High-transformation-ratio scalable DC-DC converter |
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