CN215871196U - Direct current-direct current DCDC converter and vehicle - Google Patents
Direct current-direct current DCDC converter and vehicle Download PDFInfo
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- CN215871196U CN215871196U CN202120597765.3U CN202120597765U CN215871196U CN 215871196 U CN215871196 U CN 215871196U CN 202120597765 U CN202120597765 U CN 202120597765U CN 215871196 U CN215871196 U CN 215871196U
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Abstract
The present invention relates to a dc-dc DCDC converter and a vehicle including the same, the dc-dc DCDC converter including: the transformer comprises a first direct current power supply end, a transformer, a first circuit positioned on the primary side of the transformer, a second circuit positioned on the secondary side of the transformer and a second direct current power supply end; wherein the first circuit comprises a first leg comprising a first power switching device and a second power switching device arranged in a half-bridge configuration; wherein the second circuit comprises a second leg comprising a third power switching device and a fourth power switching device arranged in a half-bridge configuration; and wherein the first power switch, the second power switch, the third power switch, and the fourth power switch are configured to conduct at zero voltage.
Description
Technical Field
The present invention relates to the field of circuits, and more particularly, to a dc-dc DCDC converter and a vehicle including the same.
Background
With the development of power conversion technology, how to improve the performance/weight/volume/efficiency/reliability of the switching power supply is an important research point, wherein the high frequency of the switching power supply is an important means for realizing the performance. However, the switching loss of the switching power supply limits further improvement of the operating frequency, and becomes a factor that restricts the switching power supply from increasing in frequency.
The DC-DC DCDC converter is a research hotspot of power conversion and is widely applied to the fields of hybrid vehicles and pure electric vehicles. The DC-DC converter not only can serve as a connection bridge in front of two electric systems with different voltage levels, but also can regulate and manage energy.
Therefore, it is necessary to design a dc-dc DCDC converter that reduces the switching loss.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a direct current-direct current (DCDC) converter, which reduces switching loss, voltage, current stress and electromagnetic noise by realizing zero-voltage conduction of a power switch device.
To achieve one or more of the above objects, the present invention provides the following technical solutions.
According to a first aspect of the present invention, there is provided a dc-dc DCDC converter including: the transformer comprises a first direct current power supply end, a transformer, a first circuit positioned on the primary side of the transformer, a second circuit positioned on the secondary side of the transformer and a second direct current power supply end; wherein the first circuit comprises a first leg comprising a first power switching device and a second power switching device arranged in a half-bridge configuration; wherein the second circuit comprises a second leg comprising a third power switching device and a fourth power switching device arranged in a half-bridge configuration; and wherein the first power switch, the second power switch, the third power switch, and the fourth power switch are configured to conduct at zero voltage.
According to the dc-dc DCDC converter of an embodiment of the present invention, the on-time of the second power switch device is adjusted to obtain different voltages at the middle point of the first bridge arm, and the alternating voltages of positive and negative are obtained at the primary side of the transformer by using the alternate conduction of the first power switch device and the second power switch device.
The dc-dc DCDC converter according to an embodiment of the utility model or any of the above embodiments, wherein a first terminal of the first power switching device is connected to a positive electrode of the first dc power source terminal and a first terminal of a primary inductance of the transformer, and a second terminal of the first power switching device is connected to a first terminal of the primary inductance of the transformer; and the first end of the second power switch device is connected with the negative electrode of the first direct current power supply end and the second end of the primary inductor of the transformer, and the second end of the second power switch device is connected with the first end of the first power switch device.
The dc-dc DCDC converter according to an embodiment of the utility model or any of the above embodiments, wherein a first terminal of the third power switching device is connected to the positive electrode of the second dc power supply terminal and a first terminal of the secondary inductance of the transformer, and a second terminal of the third power switching device is connected to the first terminal of the secondary inductance of the transformer; and a first terminal of the fourth power switch device is connected to a negative electrode of the second dc power supply terminal and a second terminal of the secondary inductance of the transformer, and a second terminal of the fourth power switch device is connected to a first terminal of the third power switch device.
According to an embodiment of the utility model or any of the above embodiments, the intermediate point of the first leg is connected to the positive terminal of the first dc power supply terminal through a first inductor, and is connected to the first terminal of the primary inductor of the transformer through a second inductor.
According to an embodiment of the utility model or any of the above embodiments, the intermediate point of the second bridge arm is connected to the positive terminal of the second dc power supply terminal through a third inductor, and is connected to the first terminal of the secondary inductor of the transformer through a fourth inductor.
According to an embodiment of the utility model or any of the above embodiments, the dc-dc converter further includes a first capacitor connected in parallel to the first power switch device, and a second capacitor connected in parallel to the second power switch device.
According to an embodiment of the utility model or any one of the above embodiments, the third power switch device is connected in parallel with a third diode in an opposite direction and connected in parallel with a third capacitor, and the fourth power switch device is connected in parallel with a fourth diode in an opposite direction and connected in parallel with a fourth capacitor, and the third diode and the fourth diode are used for rectifying an alternating current voltage output by the transformer into a direct current voltage to respectively charge capacitors connected to two ends of a secondary inductor of the transformer.
A dc-dc DCDC converter according to an embodiment or any of the above embodiments of the utility model, wherein the dc-dc DCDC converter has a forward operation mode in which energy flows from the first dc power supply terminal to the second dc power supply terminal, and a reverse operation mode in which energy flows from the second dc power supply terminal to the first dc power supply terminal.
According to a second aspect of the utility model, there is provided a vehicle comprising a dc-dc DCDC converter according to any of the above.
Drawings
The objects and advantages of the present invention will be understood by the following detailed description of the preferred embodiments thereof, taken in conjunction with the accompanying drawings, in which:
fig. 1 is a schematic diagram of a dc-dc DCDC converter according to an embodiment of the present invention.
Detailed Description
It is easily understood that according to the technical solution of the present invention, a person skilled in the art can propose various alternative structures and implementation ways without changing the spirit of the present invention. Therefore, the following detailed description and the description with respect to the drawings are only exemplary illustrations of the technical solutions of the present invention, and should not be construed as being all of the present invention or as defining or limiting the technical solutions of the present invention.
In the following description, various parameters and components are described for different constructed embodiments, and these specific parameters and components are only examples and do not impose limitations on the embodiments of the utility model.
In the following description specific details are set forth in order to provide a thorough understanding of the present invention. It will be apparent, however, to one skilled in the art that embodiments of the utility model may be practiced without these specific details. The specific details set forth herein are merely exemplary and may be varied while remaining within the spirit and scope of the utility model.
Fig. 1 is a schematic diagram of a dc-dc DCDC converter according to an embodiment of the present invention.
In fig. 1, a dc-dc DCDC converter 10 according to an embodiment of the present invention is shown, which includes: first direct current power supply terminal V1A transformer T, a first electric circuit 110 on the primary side of the transformer T (the left side of the transformer T shown in fig. 1), a second electric circuit 120 on the secondary side of the transformer T (the right side of the transformer T shown in fig. 1), and a second dc supply terminal V2。
As shown in FIG. 1, the first circuit 110 includes a first leg, the first bridgeThe arm comprises a first power switch S arranged in a half-bridge configuration1And a second power switch device S2(ii) a And the second circuit 120 comprises a second leg comprising a third power switching device S arranged in a half-bridge configuration3And a fourth power switch device S4. Wherein, the first power switch device S of the upper and lower two power switch devices on the same bridge arm1And a second power switch device S2And a third power switch device S3And a fourth power switch device S4Respectively are conducted with each other.
Optionally, a first power switch device S1A second power switch device S2A third power switch device S3And a fourth power switch device S4And a zero voltage conduction is constructed, wherein the voltage at two ends of each power switch device before the power switch devices are conducted is zero, so that noise and loss are not generated during the conduction. On the premise of not adding any additional element, all power switching devices can be conducted at zero voltage, the limit value that the bridge arm range in circuits such as a traditional phase-shifted full bridge is limited by the size of a load is overcome, ZVS switching in a large range is realized, the problem of reverse recovery of a diode is solved, and the diode is ensured to be naturally turned off under the condition that the current is zero.
It will be appreciated by those skilled in the art that other soft switching techniques besides zero voltage conduction may be used for the dc-dc DCDC converter without departing from the spirit and scope of the present application, such that losses and voltage, current stress, and electromagnetic noise of the switching devices may be reduced.
Optionally, by adjusting the second power switch S2To obtain different voltages at the intermediate point a of the first leg, and with the first power switching device S1And said second power switch device S2The alternating conduction of the transformer T obtains the alternating positive and negative voltages on the primary side of the transformer T.
Optionally, the first power switch device S1And a first DC power supply terminal V1Is connected to a first terminal of a primary inductance of said transformer T, and said first power switch device S1Is connected to a first end of a primary inductance of said transformer T; and the second power switch device S2And a first DC power supply terminal V1Is connected to a second terminal of the primary inductance of the transformer T, the second power switch device S2And the second terminal of the first power switch device S1Is connected to the first end of the first housing.
Optionally, the third power switch device S3And the second DC power supply terminal V2Is connected to a first terminal of a secondary inductance of said transformer T, and said third power switch device S3Is connected to a first end of a secondary inductance of said transformer T; and the fourth power switch device S4And the second DC power supply terminal V2Is connected to a second terminal of a secondary inductance of the transformer T, and the fourth power switch device S4And the second terminal of the third power switch device S3Is connected to the first end of the first housing.
Optionally, a middle point a of the first leg passes through a first inductor L1And the first DC power supply terminal V1And via the second inductance Lσ1Is connected to a first terminal of a primary inductance of the transformer T.
Optionally, a middle point c of the second leg passes through a third inductance L2And the second DC power supply terminal V2And through a fourth inductance Lσ2Is connected to a first terminal of a secondary inductance of the transformer T.
Optionally, the first power switch device S1Reverse parallel connection with a first diode DS1And is connected in parallel with a first capacitor CS1And said second power switch device S2A second diode D is reversely connected in parallelS2And is connected in parallel with a second capacitor CS2。
Optionally, the third power switch device S3Reverse parallel connectionWith a third diode DS3And is connected in parallel with a third capacitor CS3And said fourth power switch device S4A fourth diode D is reversely connected in parallelS4And a fourth capacitor C is connected in parallelS4Using said third diode DS3And the fourth diode DS4Rectifying the AC voltage output by the transformer T into DC voltage to respectively couple capacitors C connected to two ends of a secondary inductor of the transformer3And C4And charging is carried out.
Optionally, the first power switch device S1A second power switch device S2A third power switch device S3And a fourth power switch device S4The first terminal of (a) is an emitter and the second terminal is a collector.
As will be appreciated by those skilled in the art, the first power switch S is described above1A second power switch device S2A third power switch device S3And a fourth power switch device S4BJT transistors may be used, and other forms of power switching devices may be used without departing from the spirit and scope of the present application.
As an example, in actual operation, the dc-dc DCDC converter 10 has a forward operation mode and a reverse operation mode. In the forward operating mode, energy is supplied from the first DC power supply terminal V1To the second DC power supply terminal V2At this time, the first power switch device S1And a second power switch device S2Forming a leading bridge arm and a third power switch device S3And a fourth power switch device S4Forming lagging legs, i.e. first power switching devices S1Leading the third power switch device S3A certain angle (phase shift angle) of the trigger pulse. In the reverse operating mode, energy is supplied from the second DC supply terminal V2To the first DC power supply terminal V1At this time, the third power switch device S3And a fourth power switch device S4Forming leading bridge arm, first power switch device S1And a second power switch device S2Forming lagging legs, i.e. first power switching devices S1Behind the third power switch device S3A certain angle (phase shift angle) of the trigger pulse. By implementing both the forward operation mode and the reverse operation mode described above, forward flow and reverse flow of energy are realized, thereby improving the convenience of the dc-dc DCDC converter and reducing the cost thereof in the actual use thereof.
The energy flow process of the dc-dc DCDC converter 10 will be described below by taking the forward operation mode as an example. To simplify the example, the following conditions are assumed: 1) all power switches are ideal; 2) the circuit works in a steady state; and 3) all energy storage elements are lossless.
Viewed from the primary side of the transformer T, the circuit is similar to a Boost circuit, by applying a second power switching device S2Can be adjusted at the middle point a of the first leg (first power switch device S)1And a second power switch device S2The middle point of (d) to obtain different voltages. At the same time, the first power switch device S is utilized1And a second power switch device S2Are conducted in turn, and positive and negative alternate voltages are obtained on the primary side of the transformer T. And for the secondary side of the transformer T, a third power switch device S is utilized3And a fourth power switch device S4Is inversely parallel connected with the third diode DS3And a fourth diode DS4Rectifying the output AC voltage of the transformer T to rectify the pulse AC voltage on the transformer T into DC, and rectifying a capacitor C connected to both ends of a secondary inductor of the transformer T3And C4And charging is carried out. In the capacitor C3And C4Sufficiently large, capacitance C3And C4The voltage on can be considered constant. At this time, the principle of the circuit on the secondary side of the transformer T is similar to the Buck circuit.
The utility model relates to a direct current-direct current (DC-DC) DC converter and a vehicle comprising the DC-DC converter, and provides an isolation type bidirectional DC-DC converter topology with a symmetrical structure, which reduces the loss, voltage, current stress and electromagnetic noise of a power switch device by realizing soft switching aiming at all the power switch devices and diodes of the converter.
The technical scope of the present invention is not limited to the contents of the above-described embodiments, and those skilled in the art can make various changes and modifications to the above-described embodiments without departing from the technical idea and spirit of the present invention, and these changes and modifications should fall within the scope of the present invention.
Claims (9)
1. A dc-dc DCDC converter, comprising: the transformer comprises a first direct current power supply end, a transformer, a first circuit positioned on the primary side of the transformer, a second circuit positioned on the secondary side of the transformer and a second direct current power supply end;
wherein the first circuit comprises a first leg comprising a first power switching device and a second power switching device arranged in a half-bridge configuration;
wherein the second circuit comprises a second leg comprising a third power switching device and a fourth power switching device arranged in a half-bridge configuration; and
wherein the first power switch, the second power switch, the third power switch, and the fourth power switch are configured to conduct at zero voltage,
the on-time of the second power switch device is adjusted to obtain different voltages at the middle point of the first bridge arm, and the alternating positive and negative voltages are obtained at the primary side of the transformer by utilizing the alternate on-states of the first power switch device and the second power switch device.
2. The dc-dc DCDC converter of claim 1, wherein a first terminal of the first power switching device is connected to a positive terminal of the first dc power supply terminal and a first terminal of a primary inductance of the transformer, and a second terminal of the first power switching device is connected to a first terminal of the primary inductance of the transformer; and
the first end of the second power switch device is connected with the negative electrode of the first direct current power supply end and the second end of the primary inductor of the transformer, and the second end of the second power switch device is connected with the first end of the first power switch device.
3. The dc-dc DCDC converter of claim 1, wherein a first terminal of the third power switching device is connected to the positive terminal of the second dc power supply terminal and a first terminal of the secondary inductance of the transformer, and a second terminal of the third power switching device is connected to the first terminal of the secondary inductance of the transformer; and
a first terminal of the fourth power switch device is connected to a negative electrode of the second dc power supply terminal and a second terminal of the secondary inductor of the transformer, and a second terminal of the fourth power switch device is connected to a first terminal of the third power switch device.
4. The dc-dc DCDC converter of claim 2, wherein the middle point of the first leg is connected to the positive terminal of the first dc power supply terminal through a first inductance and to the first terminal of the primary inductance of the transformer through a second inductance.
5. The DC-DC DCDC converter of claim 3, wherein the middle point of said second leg is connected to the positive terminal of said second DC power supply terminal through a third inductor and to the first terminal of the secondary inductor of said transformer through a fourth inductor.
6. The dc-dc DCDC converter of claim 1, wherein the first power switch is connected in reverse parallel with a first diode and in parallel with a first capacitor, and the second power switch is connected in reverse parallel with a second diode and in parallel with a second capacitor.
7. The dc-dc DCDC converter according to claim 1, wherein the third power switch device is connected in parallel with a third diode in an opposite direction and connected in parallel with a third capacitor, and the fourth power switch device is connected in parallel with a fourth diode in an opposite direction and connected in parallel with a fourth capacitor, and the third diode and the fourth diode are used to rectify the ac voltage output from the transformer into the dc voltage to charge the capacitors connected across the secondary inductor of the transformer, respectively.
8. The dc-dc DCDC converter of claim 1, wherein the dc-dc DCDC converter has a forward operation mode in which energy flows from the first dc power supply terminal to the second dc power supply terminal, and a reverse operation mode in which energy flows from the second dc power supply terminal to the first dc power supply terminal.
9. A vehicle, characterized in that the vehicle comprises a dc-dc DCDC converter according to any of claims 1-8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120597765.3U CN215871196U (en) | 2021-03-24 | 2021-03-24 | Direct current-direct current DCDC converter and vehicle |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120597765.3U CN215871196U (en) | 2021-03-24 | 2021-03-24 | Direct current-direct current DCDC converter and vehicle |
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| CN215871196U true CN215871196U (en) | 2022-02-18 |
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| CN202120597765.3U Active CN215871196U (en) | 2021-03-24 | 2021-03-24 | Direct current-direct current DCDC converter and vehicle |
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