CN209823644U - DCDC bidirectional conversion circuit and converter - Google Patents
DCDC bidirectional conversion circuit and converter Download PDFInfo
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- CN209823644U CN209823644U CN201920515851.8U CN201920515851U CN209823644U CN 209823644 U CN209823644 U CN 209823644U CN 201920515851 U CN201920515851 U CN 201920515851U CN 209823644 U CN209823644 U CN 209823644U
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Abstract
The utility model is suitable for an electron technical field provides DCDC bidirectional conversion circuit and converter. The circuit comprises four bridge arms and two inductors, wherein each bridge arm comprises two switching tubes connected in series and a diode connected in parallel with the two switching tubes connected in series; the common node of two switching tubes in the first bridge arm is connected with the common node of two switching tubes in the third bridge arm through a first inductor, and the anode of the diode in the first bridge arm is connected with the cathode of the diode in the second bridge arm; and a common node of two switching tubes in the fourth bridge arm is connected with a common node of two switching tubes in the second bridge arm through a second inductor, a cathode of a diode in the fourth bridge arm is connected with an anode of a diode in the third bridge arm, and the voltage drop of the diode is less than the voltage drop of two ends of two switching tubes connected in series in the corresponding bridge arm. The utility model discloses can realize that the high pressure is two-way can rise two transform of degradable, the diode provides the afterflow return circuit in for the bridge arm, reduces switching device's in the bridge arm voltage stress.
Description
Technical Field
The utility model belongs to the technical field of the electron, especially, relate to DCDC bidirectional conversion circuit and converter.
Background
A DCDC (direct current-direct current) converter is a direct current conversion device for converting a direct current basic power supply into other voltage types, and is widely applied to the fields of solar power generation, uninterruptible power supplies and the like. The working principle is to convert the direct current into another direct current voltage (boost or buck).
At present, the application of DCDC converters is more and more extensive, and different DCDC converters can be equivalent to Boost type Boost converters or Buck type Buck converters through simplified conversion. In the traditional DCDC converter, energy flows unidirectionally, so that inductive current is discontinuous, unstable oscillation of a system is easily caused, and the voltage stress of a switch device inside the converter is large, so that the reliability of the system is reduced.
SUMMERY OF THE UTILITY MODEL
In view of this, the embodiment of the present invention provides a DCDC bidirectional conversion circuit and a converter, so as to solve the problem that the energy of the conventional DCDC converter flows in one direction and the voltage stress of the internal switching device is large in the prior art.
The embodiment of the utility model provides a first aspect provides DCDC bidirectional conversion circuit, include: the bridge comprises a first bridge arm, a second bridge arm, a third bridge arm, a fourth bridge arm, a first inductor and a second inductor; each bridge arm comprises two switching tubes connected in series and a diode connected in parallel with the two switching tubes connected in series;
a common node of two switching tubes connected in series in the first bridge arm is connected with a common node of two switching tubes connected in series in the third bridge arm through the first inductor, and an anode of a diode in the first bridge arm is connected with a cathode of a diode in the second bridge arm; the cathode of the diode in the first bridge arm and the anode of the diode in the second bridge arm are respectively connected with two ends of an external first power supply;
a common node of two serially connected switching tubes in the fourth bridge arm is connected with a common node of two serially connected switching tubes in the second bridge arm through the second inductor, and a cathode of a diode in the fourth bridge arm is connected with an anode of a diode in the third bridge arm; the cathode of the diode in the third bridge arm and the anode of the diode in the fourth bridge arm are respectively connected with two ends of an external second power supply;
and the voltage drop of the diode is less than the voltage drop of two ends of two switching tubes connected in series in the corresponding bridge arm.
Optionally, the first leg includes: the first switch tube, the second switch tube and the first diode;
the first end of the first switch tube is connected with the cathode of the first diode, the second end of the first switch tube is connected with the first end of the second switch tube, and the second end of the second switch tube is connected with the anode of the first diode.
Optionally, the second leg includes: the third switching tube, the fourth switching tube and the second diode;
the first end of the third switching tube is connected with the cathode of the second diode, the second end of the third switching tube is connected with the first end of the fourth switching tube, and the second end of the fourth switching tube is connected with the anode of the second diode.
Optionally, the third bridge arm includes: a fifth switching tube, a sixth switching tube and a third diode;
the first end of the fifth switching tube is connected with the cathode of the third diode, the second end of the fifth switching tube is connected with the first end of the sixth switching tube, and the second end of the sixth switching tube is connected with the anode of the third diode.
Optionally, the fourth leg includes: a seventh switching tube, an eighth switching tube and a fourth diode;
a first end of the seventh switching tube is connected with a cathode of the fourth diode, a second end of the seventh switching tube is connected with a first end of the eighth switching tube, and a second end of the eighth switching tube is connected with an anode of the fourth diode.
Optionally, the switching tube is an IGBT or MOS tube.
Optionally, the switch tube is an N-channel IGBT or an N-channel MOS tube.
Optionally, the DCDC bidirectional conversion circuit further includes: the first capacitor, the second capacitor, the third capacitor and the fourth capacitor;
the first end of the first capacitor is connected with the cathode of the diode in the first bridge arm, and the second end of the first capacitor is connected with the anode of the diode in the first bridge arm;
a first end of the second capacitor is respectively connected with a cathode of the diode in the second bridge arm and a second end of the first capacitor, and a second end of the second capacitor is connected with an anode of the diode in the second bridge arm;
the first end of the third capacitor is connected with the cathode of the diode in the third bridge arm, and the second end of the third capacitor is connected with the anode of the diode in the third bridge arm;
and a first end of the fourth capacitor is respectively connected with a cathode of the diode in the fourth bridge arm and a second end of the third capacitor, and a second end of the fourth capacitor is connected with an anode of the diode in the fourth bridge arm.
Optionally, the first capacitor and the second capacitor have the same parameters, and the third capacitor and the fourth capacitor have the same parameters.
A second aspect of the embodiments of the present invention provides a DCDC bidirectional converter, including a first power supply and a second power supply, further including a DCDC bidirectional conversion circuit, which further includes any one of the first aspect of the embodiments of the first power supply and the second power supply connected.
Compared with the prior art, the embodiment of the utility model beneficial effect who exists is: the circuit mainly comprises four groups of bridge arms and two inductors, each bridge arm comprises two switching tubes connected in series and a diode connected in parallel with the two switching tubes connected in series, the structure is simple, the cost is low, the voltage drop of the diode is smaller than that of the two ends of the two switching tubes connected in series in the corresponding bridge arm, a follow current loop is provided for the corresponding bridge arm, and the voltage stress of a switching device is reduced; the common node of the two switching tubes connected in series in the first bridge arm is connected with the common node of the two switching tubes connected in series in the third bridge arm through a first inductor, and the anode of the diode in the first bridge arm is connected with the cathode of the diode in the second bridge arm; the cathode of the diode in the first bridge arm and the anode of the diode in the second bridge arm are respectively connected with two ends of an external first power supply; a common node of two switching tubes connected in series in the fourth bridge arm is connected with a common node of two switching tubes connected in series in the second bridge arm through a second inductor, and a cathode of a diode in the fourth bridge arm is connected with an anode of a diode in the third bridge arm; and the cathode of the diode in the third bridge arm and the anode of the diode in the fourth bridge arm are respectively connected with two ends of an external second power supply, so that high-voltage bidirectional up-and-down dual conversion is realized.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the embodiments or the prior art descriptions will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive labor.
Fig. 1 is a schematic structural diagram of a DCDC bidirectional conversion circuit according to an embodiment of the present invention.
Detailed Description
In the following description, for purposes of explanation and not limitation, specific details are set forth, such as particular system structures, techniques, etc. in order to provide a thorough understanding of the embodiments of the invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present invention with unnecessary detail.
In order to explain the technical solution of the present invention, the following description is made by using specific examples.
Example one
Referring to fig. 1, the present embodiment provides a DCDC bidirectional conversion circuit, including: first leg 100, second leg 200, third leg 300, fourth leg 400, first inductance L1, and second inductance L2. Each bridge arm comprises two switching tubes connected in series and a diode connected in parallel with the two switching tubes connected in series. A common node of two serially connected switching tubes in the first bridge arm 100 is connected with a common node of two serially connected switching tubes in the third bridge arm 300 through a first inductor L1, and an anode of a diode in the first bridge arm 100 is connected with a cathode of a diode in the second bridge arm 200; the cathode of the diode in first leg 100 and the anode of the diode in second leg 200 are connected to both ends of an external first power source V1, respectively.
A common node of two serially connected switching tubes in the fourth bridge arm 400 is connected with a common node of two serially connected switching tubes in the second bridge arm 200 through a second inductor L2, and a cathode of a diode in the fourth bridge arm 400 is connected with an anode of a diode in the third bridge arm 300; the cathode of the diode in third leg 300 and the anode of the diode in fourth leg 400 are connected to both ends of an external second power source V2, respectively.
The voltage drop of the diode of each bridge arm is smaller than the voltage drop of two ends of two switching tubes connected in series in the corresponding bridge arm, and the diode provides a follow current loop for the corresponding bridge arm and reduces the pressure of the switching tubes.
The DCDC bidirectional conversion circuit of this embodiment may discharge the first power source V1 to the second power source V2 through four sets of arms, or discharge the second power source V2 to the first power source V1 through four sets of arms when the voltage of the first power source V1 is lower than the voltage of the second power source V2. It can also be realized that when the voltage of the second power supply V2 is higher than the voltage of the first power supply V1, the first power supply V1 can discharge to the second power supply V2 through four sets of arms, or the second power supply V2 can discharge to the first power supply V1 through four sets of arms.
In the DCDC bidirectional conversion circuit, each bridge arm comprises two switching tubes connected in series and a diode connected in parallel with the two switching tubes connected in series, the structure is simple, the cost is low, the voltage drop of the diode is less than that of two ends of the two switching tubes connected in series in the corresponding bridge arm, a follow current loop is provided for the corresponding bridge arm, and the voltage stress of a switching device is reduced; a common node of two switching tubes connected in series in the first bridge arm 100 is connected with a common node of two switching tubes connected in series in the third bridge arm 300 through a first inductor L1, and an anode of a diode in the first bridge arm 100 is connected with a cathode of a diode in the second bridge arm 200; the common node of the two serially connected switching tubes in the fourth bridge arm 400 is connected with the common node of the two serially connected switching tubes in the second bridge arm 200 through a second inductor L2, and the cathode of the diode in the fourth bridge arm 400 is connected with the anode of the diode in the third bridge arm 300, so that high-voltage bidirectional up-and-down double conversion is realized.
In one embodiment, first leg 100 may include: a first switch tube Q1, a second switch tube Q2 and a first diode D1. The voltage drop of the first diode D1 is less than the voltage drop across the series connection of the first switch Q1 and the second switch Q2.
A first terminal of the first switch Q1 is connected to a cathode of the first diode D1, a second terminal of the first switch Q1 is connected to a first terminal of the second switch Q2, and a second terminal of the second switch Q2 is connected to an anode of the first diode D1. Since the voltage drop of the first diode D1 is smaller than the voltage drop across the first switch tube Q1 and the second switch tube Q2 connected in series (the voltage drop between the first end of the first switch tube Q1 and the second end of the second switch tube Q2), the current between the first end of the first switch tube Q1 and the second end of the second switch tube Q2 flows through the first diode D1, a free-wheeling loop is formed, and the voltage stress of the first switch tube Q1 and the second switch tube Q2 is reduced.
The second leg 200 may include a third switching tube Q3, a fourth switching tube Q4, and a second diode D2. The voltage drop of the second diode D2 is less than the voltage drop across the series connection of the third switching tube Q3 and the fourth switching tube Q4.
A first terminal of the third switching tube Q3 is connected to the cathode of the second diode D2, a second terminal of the third switching tube Q3 is connected to a first terminal of the fourth switching tube Q4, and a second terminal of the fourth switching tube Q4 is connected to the anode of the second diode D2. Since the voltage drop of the second diode D2 is smaller than the voltage drop across the series-connected third switching tube Q3 and fourth switching tube Q4 (the voltage drop between the first end of the third switching tube Q3 and the second end of the fourth switching tube Q4), the current between the first end of the third switching tube Q3 and the second end of the fourth switching tube Q4 flows through the second diode D2, a freewheeling circuit is formed, and the voltage stress of the third switching tube Q3 and the fourth switching tube Q4 is reduced.
Third leg 300 may include a fifth switching tube Q5, a sixth switching tube Q6, and a third diode D3. The voltage drop of the third diode D3 is less than the voltage drop across the series connection of the fifth switching tube Q5 and the sixth switching tube Q6.
A first end of the fifth switching tube Q5 is connected to the cathode of the third diode D3, a second end of the fifth switching tube Q5 is connected to a first end of the sixth switching tube Q6, and a second end of the sixth switching tube Q6 is connected to the anode of the third diode D3. Since the voltage drop of the third diode D3 is smaller than the voltage drop across the series-connected fifth switching tube Q5 and sixth switching tube Q6 (the voltage drop between the first end of the fifth switching tube Q5 and the second end of the sixth switching tube Q6), the current between the first end of the fifth switching tube Q5 and the second end of the sixth switching tube Q6 flows through the third diode D3, a freewheeling circuit is formed, and the voltage stress of the fifth switching tube Q5 and the sixth switching tube Q6 is reduced.
The fourth leg 400 may include a seventh switching tube Q7, an eighth switching tube Q8, and a fourth diode D4. The voltage drop of the fourth diode D4 is less than the voltage drop across the series connection of the seventh switching tube Q7 and the eighth switching tube Q8.
A first end of the seventh switching tube Q7 is connected to the cathode of the fourth diode D4, a second end of the seventh switching tube Q7 is connected to a first end of the eighth switching tube Q8, and a second end of the eighth switching tube Q8 is connected to the anode of the fourth diode D4. Since the voltage drop of the fourth diode D4 is smaller than the voltage drop across the series-connected seventh switch Q7 and eighth switch Q8 (the voltage drop between the first end of the seventh switch Q7 and the second end of the eighth switch Q8), the current between the first end of the seventh switch Q7 and the second end of the eighth switch Q8 flows through the fourth diode D4, forming a freewheeling circuit, reducing the voltage stress of the seventh switch Q7 and the eighth switch Q8.
Specifically, a common node of two serially connected switching tubes in the first arm 100 (a connection point between the second end of the first switching tube Q1 and the first end of the second switching tube Q2) is connected to the first end of the first inductor L1, and a common node of two serially connected switching tubes in the third arm 300 (a connection point between the second end of the fifth switching tube Q5 and the first end of the sixth switching tube Q6) is connected to the second end of the first inductor L1; a common node of two serially connected switching tubes in the second bridge arm 200 (a connection point between the second end of the third switching tube Q3 and the first end of the fourth switching tube Q4) is connected to the first end of the second inductor L2, and a common node of two serially connected switching tubes in the fourth bridge arm 400 (a connection point between the second end of the seventh switching tube Q7 and the first end of the eighth switching tube Q8) is connected to the second end of the second inductor L2.
Optionally, all the switch tubes of this embodiment may be IGBT or MOS tubes.
Optionally, all the switch tubes of this embodiment may also be N-channel IGBT or N-channel MOS tubes.
In one embodiment, the DCDC bidirectional conversion circuit may further include: a first capacitor C1, a second capacitor C2, a third capacitor C3 and a fourth capacitor C4.
A first end of a first capacitor C1 is connected to the cathode of the diode in first leg 100 (cathode of first diode D1), and a second end of a first capacitor C1 is connected to the anode of the diode in first leg 100 (anode of first diode D1); a first end of a second capacitor C2 is connected to a cathode of the diode in the second leg 200 (cathode of the second diode D2) and a second end of the first capacitor C1, respectively, and a second end of the second capacitor C2 is connected to an anode of the diode in the second leg 200 (anode of the second diode D2); a first terminal of the third capacitor C3 is connected to the cathode of the diode in the third bridge arm 300 (cathode of the third diode D3), and a second terminal of the third capacitor C3 is connected to the anode of the diode in the third bridge arm 300 (anode of the third diode D3); a first end of the fourth capacitor C4 is connected to the cathode of the diode in the fourth leg 400 (the cathode of the fourth diode D4) and the second end of the third capacitor C3, respectively, and a second end of the fourth capacitor C4 is connected to the anode of the diode in the fourth leg 400 (the anode of the fourth diode D4).
Optionally, the first capacitor C1 and the second capacitor C2 have the same parameters, and the third capacitor C3 and the fourth capacitor C4 have the same parameters.
The following describes the operation process of the DCDC bidirectional conversion circuit in detail with reference to fig. 1:
1. the specific process that the first power supply V1 discharges to the second power supply V2 through four groups of bridge arms when the voltage of the first power supply V1 is lower than that of the second power supply V2 is as follows:
first switching tube Q1 of first arm 100, sixth switching tube Q6 of third arm 300, fourth switching tube Q4 of second arm 200 and seventh switching tube Q7 of fourth arm 400 are all turned on, and second switching tube Q2 of first arm 100, fifth switching tube Q5 of third arm 300, third switching tube Q3 of second arm 200 and eighth switching tube Q8 of fourth arm 400 are all turned off. At this time, the current of the first terminal of first capacitor C1 (i.e., the first terminal of first power source V1) returns to the second terminal of second capacitor C2 (i.e., the second terminal of first power source V1) through first switch Q1 of first arm 100, first inductor L1, and sixth switch Q6 of third arm 300, seventh switch Q7 of fourth arm 400, second inductor L2, and fourth switch Q4 of second arm 200. The first inductor L1 gradually increases from left to right current, the second inductor L2 gradually increases from right to left current, and both the first inductor L1 and the second inductor L2 store energy.
The first switching tube Q1 and the second switching tube Q2 of the first arm 100 are not turned on at the same time, and the third switching tube Q3 and the fourth switching tube Q4 of the second arm 200 are not turned on at the same time. In the process, the first inductor L1 and the second inductor L2 both release energy, the third capacitor C3 and the fourth capacitor C4 both charge, and since the third capacitor C3 and the fourth capacitor C4 are connected in series and then connected in parallel with the second power supply V2, the third capacitor C3 and the fourth capacitor C4 are used for charging the second power supply V2. When the current of first inductor L1 or second inductor L2 decreases to 0, second switching tube Q2 of first leg 100 and fifth switching tube Q5 of third leg 300 are both turned on, and first switching tube Q1 of first leg 100 and sixth switching tube Q6 of third leg 300 are both turned off.
When the first switch tube Q1 of the first bridge arm 100 and the fourth switch tube Q4 of the second bridge arm 200 are both turned off, the current in the process passes through the second diode D2 and the first diode D1, so that the voltage stress of the switch tubes is reduced, and the heat dissipation is facilitated.
2. The specific process of discharging the first power supply V1 to the second power supply V2 through four sets of arms when the voltage of the first power supply V1 is higher than the voltage of the second power supply V2 is as follows:
first switching tube Q1 of first bridge arm 100 is turned on, second switching tube Q2 of first bridge arm 100 is turned off, sixth switching tube Q6 of third bridge arm 300 is turned off, seventh switching tube Q7 of fourth bridge arm 400 is turned off, fourth switching tube Q4 of second bridge arm 200 is turned on, and third switching tube Q3 of second bridge arm 200 is turned off. At this time, the current of the first terminal of the first power source V1 (i.e., the first terminal of the first capacitor C1) returns to the second terminal of the first power source V1 through the first switch Q1 of the first leg 100, the first inductor L1, the third diode D3, the third capacitor C3, the fourth capacitor C4, the fourth diode D4, the second inductor L2, and the fourth switch Q4 of the second leg 200.
In the process, the first capacitor C1 and the second capacitor C2 are both discharged, the third capacitor C3 and the fourth capacitor C4 are both charged, and the first inductor L1 and the second inductor L2 are both stored with energy. The first capacitor C1 and the second capacitor C2 are connected in series and then connected between the first end and the second end of the first power supply V1, and the first capacitor C1 and the second capacitor C2 discharge to obtain the discharge of the first power supply V1; the third capacitor C3 and the fourth capacitor C4 are connected in series and then connected in parallel with the second power supply V2, and the third capacitor C3 and the fourth capacitor C4 are charged, that is, the second power supply V2 is charged. In the process, the first inductor L1 and the second inductor L2 both store energy.
Then, first switching tube Q1 of first leg 100 is turned off, sixth switching tube Q6 of third leg 300 is turned off, seventh switching tube Q7 of fourth leg 400 is turned off, and fourth switching tube Q4 of second leg 200 is turned off. At this time, the current of the first inductor L1 returns to the first inductor L1 through the third diode D3, the third capacitor C3, the fourth capacitor C4, the fourth diode D4, the second inductor L2, the second diode D2, and the first diode D1 for energy release, and both the first inductor L1 and the second inductor L2 release energy. The third diode D3 and the fourth diode D4 provide a freewheeling circuit in the corresponding bridge arm, and voltage stress of the switching device is reduced.
When the voltage of first power source V1 is higher than the voltage of second power source V2, second switching tube Q2 of first arm 100, fifth switching tube Q5 of third arm 300, third switching tube Q3 of second arm 200, and eighth switching tube Q8 of fourth arm 400 are turned on before the current of first inductor L1 and/or second inductor L2 crosses zero. When the current of first inductor L1 or second inductor L2 decreases to 0, the second switching tube of first arm 100 and the first switching tube of third arm 300 are both turned on, and the first switching tube Q1 of first arm 100 and the second switching tube Q2 of third arm 300 are both turned off.
In the control method, fourth switching tube Q4 of second arm 200 corresponds to first switching tube Q1 of first arm 100, fourth switching tube Q4 of second arm 200 corresponds to second switching tube Q2 of first arm 100, eighth switching tube Q8 of fourth arm 400 corresponds to fifth switching tube Q5 of third arm 300, and seventh switching tube Q7 of fourth arm 400 corresponds to sixth switching tube Q6 of third arm 300.
In practical applications, if the switching tubes corresponding to each other are controlled separately, the driving signals with different duty ratios are used for controlling the potential balance between the first capacitor C1 and the second capacitor C2, or between the third capacitor C3 and the fourth capacitor C4.
No matter whether the voltage of the first power source V1 is higher or lower than the voltage of the second power source V2, the DCDC bidirectional conversion circuit of the embodiment can realize that the first power source V1 discharges the second power source V2, that is, the second power source V2 charges, in the process, the first power source V1 can be regarded as a power source for supplying power, and the second power source V2 can be regarded as a load for consuming power.
3. The specific process that the second power supply V2 discharges to the first power supply V1 through four groups of bridge arms when the voltage of the first power supply V1 is lower than the voltage of the second power supply V2 is as follows:
the fifth switching tube Q5 of the third bridge arm 300 and the second switching tube Q2 of the first bridge arm 100 are both turned on, the sixth switching tube Q6 of the third bridge arm 300 and the first switching tube Q1 of the first bridge arm 100 are both turned off, and the second switching tube Q2 of the first bridge arm 100 is turned off. In the process, the third capacitor C3 and the fourth capacitor C4 are both discharged, the first capacitor C1 and the second capacitor C2 are both charged, the third capacitor C3 and the fourth capacitor C4 are connected in series and then connected between the first end and the second end of the second power supply V2, and the discharge of the third capacitor C3 and the fourth capacitor C4 is the discharge of the second power supply V2; the first capacitor C1 and the second capacitor C2 are connected in series and then connected in parallel with the first power supply V1, and the first capacitor C1 and the second capacitor C2 are charged, that is, the first power supply V1 is charged.
When the current of the first inductor L1 or the second inductor L2 decreases to 0, the first switching tube Q1 of the first leg 100 is turned on; the sixth switching tube Q6 of the third bridge arm 300 and the second switching tube Q2 of the first bridge arm 100 are both turned off, and the fifth switching tube Q5 of the third bridge arm 300 and the first switching tube Q1 of the first bridge arm 100 are both turned off; or, the sixth switching tube Q6 of the third arm 300 and the first switching tube Q1 of the first arm 100 are both turned on, and the fifth switching tube Q5 of the third arm 300 and the second switching tube Q2 of the first arm 100 are both turned off; the sixth switching tubes Q6 of the third bridge arm 300 are all turned off.
The specific current flow direction in this process is similar to the current flow direction in combination with the conduction condition of the switching tube, and details are not repeated.
4. The specific process of discharging the second power supply V2 to the first power supply V1 through four sets of arms when the voltage of the first power supply V1 is higher than the voltage of the second power supply V2 is as follows:
the fifth switching tube Q5 of the third leg 300 is turned on; the second switching tube Q2 of the first bridge arm 100 and the sixth switching tube Q6 of the third bridge arm 300 are both turned off; then, the fifth switching tube Q5 of the third arm 300 and the second switching tube Q2 of the first arm 100 are both turned off. In the process, the third capacitor C3 and the fourth capacitor C4 are both discharged, the first capacitor C1 and the second capacitor C2 are both charged, the third capacitor C3 and the fourth capacitor C4 are connected in series and then connected between the first end and the second end of the second power supply V2, and the discharge of the third capacitor C3 and the fourth capacitor C4 is the discharge of the second power supply V2; the first capacitor C1 and the second capacitor C2 are connected in series and then connected in parallel with the first power supply V1, and the first capacitor C1 and the second capacitor C2 are charged, that is, the first power supply V1 is charged.
When the current of the first inductor L1 or the second inductor L2 decreases to 0, the sixth switching tube Q6 of the third bridge arm 300 and the first switching tube Q1 of the first bridge arm 100 are all turned on, and the fifth switching tube Q5 of the third bridge arm 300, the second switching tube Q2 of the first bridge arm 100 and the sixth switching tube Q6 of the third bridge arm 300 are all turned off; alternatively, first switching tube Q1 of first arm 100 is on, and sixth switching tube Q6 of third arm 300, second switching tube Q2 of first arm 100, sixth switching tube Q6 of third arm 300, and first switching tube Q1 of first arm 100 are all off.
The specific current flow direction in this process is similar to the above flow direction in combination with the conduction condition of the switching tube, and detailed description is omitted.
In the above embodiment, the DCDC bidirectional conversion circuit mainly includes four sets of bridge arms and two inductors, each bridge arm includes two switching tubes connected in series and a diode connected in parallel with the two switching tubes connected in series, the structure is simple, the cost is low, the voltage drop of the diode is smaller than the voltage drop at two ends of the two switching tubes connected in series in the corresponding bridge arm, a follow current loop is provided for the corresponding bridge arm, and the voltage stress of the switching device is reduced; a common node of two switching tubes connected in series in the first bridge arm 100 is connected with a common node of two switching tubes connected in series in the third bridge arm 300 through a first inductor L1, and an anode of a diode in the first bridge arm 100 is connected with a cathode of a diode in the second bridge arm 200; the cathode of the diode in the first bridge arm 100 and the anode of the diode in the second bridge arm 200 are respectively connected with two ends of an external first power supply V1; a common node of two serially connected switching tubes in the fourth bridge arm 400 is connected with a common node of two serially connected switching tubes in the second bridge arm 200 through a second inductor L2, and a cathode of a diode in the fourth bridge arm 400 is connected with an anode of a diode in the third bridge arm 300; the cathode of the diode in the third bridge arm 300 and the anode of the diode in the fourth bridge arm 400 are respectively connected with two ends of an external second power supply V2, so that high-voltage bidirectional up-and-down double conversion is realized.
Example two
The present embodiment provides a DCDC bidirectional converter, which includes a first power supply and a second power supply, and further includes any one of the DCDC bidirectional conversion circuits provided in the above embodiments connected to the first power supply and the second power supply, and also has the beneficial effects of any one of the DCDC bidirectional conversion circuits described above.
It will be apparent to those skilled in the art that, for convenience and brevity of description, only the above-mentioned division of the functional units and modules is illustrated, and in practical applications, the above-mentioned function distribution may be performed by different functional units and modules according to needs, that is, the internal structure of the apparatus is divided into different functional units or modules to perform all or part of the above-mentioned functions. Each functional unit and module in the embodiments may be integrated in one processing unit, or each unit may exist alone physically, or two or more units are integrated in one unit, and the integrated unit may be implemented in a form of hardware, or in a form of software functional unit. In addition, specific names of the functional units and modules are only for convenience of distinguishing from each other, and are not used for limiting the protection scope of the present application. The specific working processes of the units and modules in the system may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the above embodiments, the descriptions of the respective embodiments have respective emphasis, and reference may be made to the related descriptions of other embodiments for parts that are not described or illustrated in a certain embodiment.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
The above-mentioned embodiments are only used for illustrating the technical solution of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present invention, and are intended to be included within the scope of the present invention.
Claims (10)
- A DCDC bidirectional conversion circuit, comprising: the bridge comprises a first bridge arm, a second bridge arm, a third bridge arm, a fourth bridge arm, a first inductor and a second inductor; each bridge arm comprises two switching tubes connected in series and a diode connected in parallel with the two switching tubes connected in series;a common node of two switching tubes connected in series in the first bridge arm is connected with a common node of two switching tubes connected in series in the third bridge arm through the first inductor, and an anode of a diode in the first bridge arm is connected with a cathode of a diode in the second bridge arm; the cathode of the diode in the first bridge arm and the anode of the diode in the second bridge arm are respectively connected with two ends of an external first power supply;a common node of two serially connected switching tubes in the fourth bridge arm is connected with a common node of two serially connected switching tubes in the second bridge arm through the second inductor, and a cathode of a diode in the fourth bridge arm is connected with an anode of a diode in the third bridge arm; the cathode of the diode in the third bridge arm and the anode of the diode in the fourth bridge arm are respectively connected with two ends of an external second power supply;and the voltage drop of the diode is less than the voltage drop of two ends of two switching tubes connected in series in the corresponding bridge arm.
- 2. The DCDC bi-directional conversion circuit of claim 1, wherein the first leg comprises: the first switch tube, the second switch tube and the first diode;the first end of the first switch tube is connected with the cathode of the first diode, the second end of the first switch tube is connected with the first end of the second switch tube, and the second end of the second switch tube is connected with the anode of the first diode.
- 3. The DCDC bi-directional conversion circuit of claim 1, wherein the second leg comprises: the third switching tube, the fourth switching tube and the second diode;the first end of the third switching tube is connected with the cathode of the second diode, the second end of the third switching tube is connected with the first end of the fourth switching tube, and the second end of the fourth switching tube is connected with the anode of the second diode.
- 4. The DCDC bi-directional conversion circuit of claim 1, wherein the third bridge arm comprises: a fifth switching tube, a sixth switching tube and a third diode;the first end of the fifth switching tube is connected with the cathode of the third diode, the second end of the fifth switching tube is connected with the first end of the sixth switching tube, and the second end of the sixth switching tube is connected with the anode of the third diode.
- 5. The DCDC bi-directional conversion circuit of claim 1, wherein the fourth leg comprises: a seventh switching tube, an eighth switching tube and a fourth diode;a first end of the seventh switching tube is connected with a cathode of the fourth diode, a second end of the seventh switching tube is connected with a first end of the eighth switching tube, and a second end of the eighth switching tube is connected with an anode of the fourth diode.
- 6. The DCDC bidirectional conversion circuit according to any one of claims 2 to 5, wherein said switching tube is an IGBT or MOS tube.
- 7. The DCDC bidirectional conversion circuit of claim 6, wherein said switching transistor is an N-channel IGBT or an N-channel MOS transistor.
- 8. The DCDC bi-directional conversion circuit of claim 1, wherein the DCDC bi-directional conversion circuit further comprises: the first capacitor, the second capacitor, the third capacitor and the fourth capacitor;the first end of the first capacitor is connected with the cathode of the diode in the first bridge arm, and the second end of the first capacitor is connected with the anode of the diode in the first bridge arm;a first end of the second capacitor is respectively connected with a cathode of the diode in the second bridge arm and a second end of the first capacitor, and a second end of the second capacitor is connected with an anode of the diode in the second bridge arm;the first end of the third capacitor is connected with the cathode of the diode in the third bridge arm, and the second end of the third capacitor is connected with the anode of the diode in the third bridge arm;and a first end of the fourth capacitor is respectively connected with a cathode of the diode in the fourth bridge arm and a second end of the third capacitor, and a second end of the fourth capacitor is connected with an anode of the diode in the fourth bridge arm.
- 9. The DCDC bi-directional conversion circuit of claim 8, wherein the first capacitor and the second capacitor have the same parameters, and the third capacitor and the fourth capacitor have the same parameters.
- A DCDC bidirectional converter comprising a first power supply and a second power supply, further comprising the DCDC bidirectional converter circuit according to any one of claims 1 to 9 connected to the first power supply and the second power supply.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920515851.8U CN209823644U (en) | 2019-04-16 | 2019-04-16 | DCDC bidirectional conversion circuit and converter |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920515851.8U CN209823644U (en) | 2019-04-16 | 2019-04-16 | DCDC bidirectional conversion circuit and converter |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114285307A (en) * | 2021-12-31 | 2022-04-05 | 麦田能源有限公司 | DC-AC converter and system |
| CN116995923A (en) * | 2023-09-25 | 2023-11-03 | 苏州清研精准汽车科技有限公司 | Control method and control device for direct-current voltage conversion circuit |
-
2019
- 2019-04-16 CN CN201920515851.8U patent/CN209823644U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114285307A (en) * | 2021-12-31 | 2022-04-05 | 麦田能源有限公司 | DC-AC converter and system |
| CN116995923A (en) * | 2023-09-25 | 2023-11-03 | 苏州清研精准汽车科技有限公司 | Control method and control device for direct-current voltage conversion circuit |
| CN116995923B (en) * | 2023-09-25 | 2024-04-19 | 苏州清研精准汽车科技有限公司 | Control method and control device for direct-current voltage conversion circuit |
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