CN215378785U - Power supply conversion device - Google Patents
Power supply conversion device Download PDFInfo
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- CN215378785U CN215378785U CN202121512969.9U CN202121512969U CN215378785U CN 215378785 U CN215378785 U CN 215378785U CN 202121512969 U CN202121512969 U CN 202121512969U CN 215378785 U CN215378785 U CN 215378785U
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Abstract
The utility model provides a power conversion device, wherein a second end of a first bidirectional switch branch circuit, a second end of a second bidirectional switch branch circuit, a second end of a third bidirectional switch branch circuit and a neutral line are connected with a common node of a first capacitor unit and a second capacitor unit, so that a first phase branch circuit, a second phase branch circuit and a third phase branch circuit are mutually independent during working, the performance of the power conversion device can be improved while single-three-phase power is compatible, ripple waves of an inductor on the branch circuit working in a single-phase power mode are kept unchanged during switching between the single-phase power and the three-phase power, the design difficulty of the power conversion device is reduced, the size of the power conversion device is reduced, an alternating current side can be connected with a three-phase unbalanced power grid when the power conversion device works in a forward direction, and an alternating current side can be connected with an unbalanced load when the power conversion device works in a reverse direction.
Description
Technical Field
The utility model relates to the field of power supplies, in particular to a power supply conversion device.
Background
The electric vehicle has the remarkable characteristics of high efficiency, energy conservation, low noise and zero emission, and has incomparable advantages in the aspects of energy conservation and environmental protection. In recent years, key technologies such as power batteries, motors, control systems and vehicle-mounted chargers for electric vehicles have been greatly developed worldwide, the safety, reliability and service life of products are obviously improved, the cost is controlled to a certain extent, hybrid electric vehicles and pure electric vehicles are gradually put into practical and industrialized stages, and electric vehicles become the strategic direction of the development of the world automobile industry.
The electric vehicle is provided with a built-in high-voltage battery which is used as a stable energy source for providing power and is one of key parts of the electric vehicle. The built-in high-voltage battery is charged by converting alternating current provided by the charging device into direct current by a vehicle-mounted charger (a power supply conversion device). The alternating current provided by the charging device is not uniform at present, and some alternating current power supplies are single-phase alternating current power supplies, and some alternating current power supplies are three-phase alternating current power supplies, so that inconvenience is brought to charging. Therefore, there is a need for a power conversion device that is compatible with single-phase and three-phase ac power. However, the conventional power conversion device compatible with single-phase and three-phase ac power has many problems, such as large design difficulty of the power conversion device, large inductance value on the ac side, and large volume of the power conversion device.
SUMMERY OF THE UTILITY MODEL
The utility model provides a power conversion device, comprising: the bidirectional switch branch circuit comprises two switch tubes which are connected in series, the first end of the selection switch of each phase branch circuit is connected with the live wire inlet end, the second end of the selection switch of each phase branch circuit is connected with the first end of the inductor, and the second end of the inductor is connected with the midpoint of the switch bridge arm and the first end of the bidirectional switch branch circuit; the bidirectional switch branch circuit comprises a first capacitor unit and a second capacitor unit which are connected in series, the second ends of the bidirectional switch branch circuit are connected with a common node of the first capacitor unit and the second capacitor unit, the first ends of the switch bridge arms and the first ends of the capacitor units are connected with each other, and the second ends of the switch bridge arms and the first ends of the capacitor units are connected with each other; and the neutral line comprises a neutral line inlet end, the neutral line inlet end is connected with a common node of the first capacitor unit and the second capacitor unit, and the three live line inlet ends and the neutral line inlet end form an alternating current side of the power conversion device.
Furthermore, the first phase branch comprises a first phase live wire incoming line end, a first selection switch, a first inductor, a first switch bridge arm and a first bidirectional switch branch, the first end of the first selection switch is connected with the first phase live wire incoming line end, the second end of the first selection switch is connected with the first end of the first inductor, the first switch bridge arm comprises two switch tubes which are connected in series, the connection point of the two switch tubes forms the midpoint of the first switch bridge arm, the second end of the first inductor is connected with the midpoint of the first switch bridge arm, the first bidirectional switch branch comprises two switch tubes which are connected in series, and the first end of the first bidirectional switch branch is connected with the midpoint of the first switch bridge arm; the second phase branch comprises a second phase live wire inlet end, a second selection switch, a second inductor, a second switch bridge arm and a second bidirectional switch branch, the first end of the second selection switch is connected with the second phase live wire inlet end, the second end of the second selection switch is connected with the first end of the second inductor, the second switch bridge arm comprises two switch tubes which are connected in series, the connection point of the two switch tubes forms the midpoint of the second switch bridge arm, the second end of the second inductor is connected with the midpoint of the second switch bridge arm, the second bidirectional switch branch comprises two switch tubes which are connected in series, and the first end of the second bidirectional switch branch is connected with the midpoint of the second switch bridge arm; the third phase branch comprises a third phase live wire inlet end, a third selection switch, a third inductor, a third switch bridge arm and a third bidirectional switch branch, the first end of the third selection switch is connected with the third phase live wire inlet end, the second end of the third selection switch is connected with the first end of the third inductor, the third switch bridge arm comprises two switch tubes which are connected in series, the connection point of the two switch tubes forms the middle point of the third switch bridge arm, the second end of the third inductor is connected with the middle point of the third switch bridge arm, the third bidirectional switch branch comprises two switch tubes which are connected in series, the first end of the third bidirectional switch branch is connected with the middle point of the third switch bridge arm, and the second ends of the first to third bidirectional switch branches are connected with the common node of the first capacitor unit and the second capacitor unit.
Furthermore, the switch further comprises a fourth selection switch, the fourth selection switch comprises a first end, a second end and a control end, the first end of the fourth selection switch is connected with the first end or the second end of the first selection switch, the second end of the fourth selection switch is connected with the first end or the second end of the second selection switch, and the control end receives the switch control signal.
Furthermore, the switch further comprises a fourth selection switch, the fourth selection switch comprises a first end, a second end and a control end, the first end of the fourth selection switch is connected with the first end or the second end of the first selection switch, the second end of the fourth selection switch is connected with the first end or the second end of the third selection switch, and the control end receives the switch control signal.
Furthermore, the switch further comprises a fourth selection switch, the fourth selection switch comprises a first end, a second end and a control end, the first end of the fourth selection switch is connected with the first end or the second end of the second selection switch, the second end of the fourth selection switch is connected with the first end or the second end of the third selection switch, and the control end receives the switch control signal.
Furthermore, the switch further comprises a fifth selection switch, the fifth selection switch comprises a first end, a second end and a control end, the first end of the fifth selection switch is connected with the first end or the second end of the fourth selection switch, the second end of the fifth selection switch is connected with the first end or the second end of the selection switch on the branch not connected with the fourth selection switch, and the control end of the fifth selection switch receives the switch control signal.
Furthermore, the power conversion device also comprises an alternating voltage detection unit which is connected with the live wire incoming line end and the neutral wire incoming line end and is used for detecting whether the alternating side of the power conversion device is single-phase power or three-phase power.
Further, when the power conversion device is operated for converting alternating current into direct current, a three-phase power grid on the alternating current side is unbalanced.
Furthermore, when the power conversion device works in direct current to alternating current conversion, the alternating current side is an unbalanced load.
Furthermore, the neutral line is connected with the common node of the first capacitor unit and the second capacitor unit through the filter unit.
Drawings
Fig. 1 is a schematic diagram of a power conversion device according to an embodiment of the utility model.
Fig. 2a, 2b and 2c are schematic circuit diagrams of single-phase transformation units.
Fig. 3 is a schematic diagram of a power conversion device according to another embodiment of the utility model.
Fig. 4 is a schematic diagram of a power conversion device according to another embodiment of the utility model.
Fig. 5 is a schematic diagram of a power conversion device according to another embodiment of the utility model.
Detailed Description
The technical solutions in the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
In an embodiment of the present invention, a power conversion device is provided, which can be applied to a vehicle-mounted charger, and specifically, please refer to a schematic diagram of the power conversion device shown in fig. 1, which includes:
the bidirectional switch branch circuit comprises two switch tubes which are connected in series, the first end of the selection switch of each phase branch circuit is connected with the live wire inlet end, the second end of the selection switch of each phase branch circuit is connected with the first end of the inductor, and the second end of the inductor is connected with the midpoint of the switch bridge arm and the first end of the bidirectional switch branch circuit;
the bidirectional switch branch circuit comprises a first capacitor unit and a second capacitor unit which are connected in series, the second ends of the bidirectional switch branch circuit are connected with a common node of the first capacitor unit and the second capacitor unit, the first ends of the switch bridge arms and the first ends of the capacitor units are connected with each other, and the second ends of the switch bridge arms and the first ends of the capacitor units are connected with each other;
and the neutral line comprises a neutral line inlet end N, the neutral line inlet end N is connected with a common node of the first capacitor unit and the second capacitor unit, and the three live line inlet ends and the neutral line inlet end N form an alternating current side of the power conversion device.
When the alternating current side is single-phase electricity, the selection switch of one of the first-phase to third-phase branches is turned on, the control unit 130 detects an electric signal of the branch where the turned-on selection switch is located, and controls the switch bridge arm of the branch where the turned-on selection switch is located and the switch tube in the bidirectional switch branch to work according to the detected electric signal, so that the power conversion device works in a single-phase electricity mode; when the ac side is three-phase power, the selection switches in the first to third phase branches are all turned on, and the control unit 130 detects electrical signals of the first to third phase branches, respectively, controls the switching tubes in the switching arms and the bidirectional switching branches in the first phase branch to operate according to the electrical signals detected for the first phase branch, controls the switching tubes in the switching arms and the bidirectional switching branches in the second phase branch to operate according to the electrical signals detected for the second phase branch, and controls the switching tubes in the switching arms and the bidirectional switching branches in the third phase branch to operate according to the electrical signals detected for the third phase branch, so that the power conversion device operates in a three-phase power mode, and when switching between single-phase power and three-phase power, the ripple of the inductance of the branch operating in the single-phase power mode remains unchanged.
Referring to fig. 1, the first phase branch includes a first phase live line incoming end a and a first selection switch RL1A first inductor L1A first switch bridge arm, a first bidirectional switch branch, a first selection switch RL1The first end of the first phase live wire is connected with a first phase live wire inlet end A, and the second end of the first phase live wire is connected with a first inductor L1The first switch bridge arm comprises two switch tubes (S) connected in series1And S2) The connection point of the two switching tubes forms the midpoint of the first switching bridge arm, and the first inductor L1The second end of the first bidirectional switch branch is connected with the middle point of the first switch bridge armComprising two switching tubes (S) connected in series7And S8) And the first end of the first bidirectional switch branch is connected with the midpoint of the first switch bridge arm. The second phase branch comprises a second phase live wire incoming end B and a second selection switch RL2A second inductor L2A second switch bridge arm, a second bidirectional switch branch and a second selection switch RL2The first end of the first phase live wire is connected with the second phase live wire inlet end B, and the second end of the first phase live wire is connected with the second inductor L2The second switching leg comprises two switching tubes (S) connected in series3And S4) The connection point of the two switching tubes forms the middle point of the second switching bridge arm, and the second inductor L2Is connected with the midpoint of a second switch bridge arm, and the second bidirectional switch branch comprises two switch tubes (S) connected in series9And S10) And the first end of the second bidirectional switch branch is connected with the middle point of the second switch bridge arm. The third phase branch comprises a third phase live wire inlet end C and a third selector switch RL3A third inductor L3A third switch bridge arm, a third bidirectional switch branch and a third selection switch RL3The first end of the first inductor is connected with a third phase live wire inlet end C, and the second end of the first inductor is connected with a third inductor L3The third switch bridge arm comprises two switch tubes (S) connected in series5And S6) The connection point of the two switching tubes forms the middle point of a third switching bridge arm, and a third inductor L3The second end of the third bidirectional switch branch is connected with the middle point of a third switch bridge arm, and the third bidirectional switch branch comprises two switch tubes (S) which are connected in series11And S12) The first end of the third bidirectional switch branch is connected with the middle point of the third switch bridge arm, the first ends of the first to third switch bridge arms are connected, and the second ends of the first to third switch bridge arms are connected. The first to third switching legs and the first to third bidirectional switching legs form a switching unit 140 of the power conversion apparatus, and the first to third selection switches form a selection switching unit 110. Capacitor unit comprising a first capacitor unit (e.g. capacitor C) connected in series1) And a second capacitive unit (e.g. capacitor C)2) And the second ends of the first to third bidirectional switch branches are connected with the common node of the first capacitor unit and the second capacitor unit. The neutral line comprises a neutral line inlet end N connected with the firstA common node of the capacitor unit and the second capacitor unit.
As described above, since the second end of the first bidirectional switch branch, the second end of the second bidirectional switch branch, the second end of the third bidirectional switch branch, and the neutral line are all connected to the common node of the first capacitor unit and the second capacitor unit, the first phase branch, the second phase branch, and the third phase branch in fig. 1 are mutually independent during operation, the power conversion apparatus shown in fig. 1 can be decoupled and split into three independent conversion units, such as the single-phase conversion unit circuit schematic diagrams shown in fig. 2a, fig. 2b, and fig. 2c, fig. 2a is a first phase conversion unit circuit schematic diagram, fig. 2b is a second phase conversion unit circuit schematic diagram, and fig. 2c is a third phase conversion unit circuit schematic diagram, in terms of circuit structure, the three conversion units are mutually independent and are three independent circuits, and therefore can be controlled independently, that is, three phases may not affect each other, thereby improving the performance of the power conversion device. Thus, when the ac side is three-phase power, the control unit 130 outputs the switching control signal to control the switches of the first to third phase branches to be turned on, and the control unit 130 detects the electrical signals of the first, second and third phase branches, respectively, and controls the switching legs of the first phase branch and the switching tubes of the bidirectional switching branch according to the electrical signal detected for the first phase branch (S)1、S2、S7And S8) Working, controlling the switch bridge arm of the second phase branch and the switch tube on the bidirectional switch branch according to the electric signal detected to the second phase branch (S)3、S4、S9And S10) The operation is that the switch bridge arm of the third phase branch and the switch tube on the bidirectional switch branch are controlled according to the electric signal detected by the third phase branch (S)5、S6、S11And S12) The power conversion device works in a three-phase power mode, namely the first phase branch, the second phase branch and the third phase branch are mutually independent during working and are independently controlled according to respective detection signals, so that the performance of the power conversion device is improved. When the AC side is single-phase power, the selection switch of one of the first phase branch, the second phase branch and the third phase branch is turned on, for example, the single-phase input isWhen the first phase line A/N is inputted, the switch control signal outputted from the control unit 130 controls the first selection switch RL1On, the second selection switch RL2And a third selector switch RL3When the switching-off is performed, the control unit 130 detects the electrical signal of the first phase branch, and controls the switching leg of the first phase branch and the switching tube of the bidirectional switching branch according to the electrical signal detected for the first phase branch (S)1、S2、S7And S8) And (6) working. That is, when the power conversion device works in a single phase, one of the three conversion units works, when the power conversion device works in a three-phase mode, the three conversion units work independently, so that when the single-phase power and the three-phase power are switched, a branch circuit working in the single-phase power mode is not influenced by switching in or switching out of other two branch circuits, ripples of an inductor on the branch circuit working in the single-phase power mode are kept unchanged, the fact that the inductance value is larger for being compatible with the single-phase and three-phase work or different inductance values are adopted for working in the single-phase and three-phase modes is not considered, the design difficulty of the power conversion device is reduced, and the size of the power conversion device is reduced. In addition, as the neutral line inlet end N is connected with the common node of the first capacitance unit and the second capacitance unit, a common mode loop can be formed by the capacitance unit and the neutral line, and the EMC of the power conversion device is optimized. That is to say, the power conversion device of this application can reduce the design degree of difficulty, reduce the volume, and improve the performance when compatible single-phase and three-phase alternating current.
As shown in fig. 1 and 2a to 2c, each phase branch includes an ac side, a selection switch, an inductor, a switch bridge arm, a bidirectional switch branch and a dc side, and the electrical signal on the detection branch means to detect at least one of the ac side voltage, the ac side current, the inductor current and the voltage signal on the capacitor unit on the branch.
In one embodiment, as shown in fig. 1, the power converter further includes an ac voltage detecting unit 120 connected to the live line terminal and the neutral line terminal of each phase branch for detecting whether the ac side of the power converter is single-phase power or three-phase power, so that the control unit 130 controls the on/off of the selector switch according to the detection result to operate the power converter in the single-phase power mode or the three-phase power mode, and controls the operation of the switch in the switch unit 140.
Furthermore, when the power conversion device works in the forward direction, namely when the power conversion device works for converting alternating current into direct current, even if the three-phase power grid on the alternating current side is unbalanced, the circuit performance is not influenced because the three conversion units are independent.
Furthermore, when the power conversion device works reversely, namely works in direct current to alternating current conversion, the three conversion units are independent, so that the power conversion device can be connected with an unbalanced load, namely the unbalanced load is on the alternating current side. Thus, the power conversion device of the present application is also compatible with applications of balanced loads and unbalanced loads, and the application range of the power conversion device of the present application is expanded.
Further, in an embodiment, as shown in fig. 1, the selection switch unit 110 further includes a fourth selection switch RL4Fourth selection switch RL4Comprises a first terminal, a second terminal, a control terminal, a fourth selection switch RL4Is connected with a first selection switch RL1First terminal or second terminal of (1), fourth selection switch RL4Is connected with the second selection switch RL2And a control terminal receiving the switch control signal output by the control unit 130. As shown in FIG. 1, with a fourth selection switch RL4Is connected with a first selection switch RL1First terminal of (1), fourth selection switch RL4Is connected with the second selection switch RL2For example, when the ac voltage detecting unit 120 detects that the ac side of the power converter is single-phase power and the single-phase input is the first-phase line/N input, the switch control signal output by the control unit 130 controls the first selection switch RL1And a fourth selection switch RL4The first switch bridge arm and the second switch bridge arm are conducted to work, so that the power level of single-phase work is improved; when the single-phase input is the second phase live line/N input, the switch control signal output by the control unit 130 controls such thatSecond selector switch RL2First selection switch RL1And a fourth selection switch RL4And the first switch bridge arm and the second switch bridge arm are conducted to work, so that the power grade of single-phase work is improved. In another embodiment, the fourth selection switch RL is used4Is connected with a first selection switch RL1First terminal of (1), fourth selection switch RL4Is connected with the second selection switch RL2For example, when the ac voltage detecting unit 120 detects that the ac side of the power converter is single-phase power, and when the single-phase input is the first-phase line/N input, the control unit 130 outputs the switch control signal to control the first selection switch RL1And a fourth selection switch RL4And a second selection switch RL2The first switch bridge arm and the second switch bridge arm are conducted to work, so that the power level of single-phase work is improved; when the single-phase input is the second phase live line/N input, the switch control signal output by the control unit 130 controls the second selection switch RL2And a fourth selection switch RL4And a first selector switch RL1And the first switch bridge arm and the second switch bridge arm are conducted to work, so that the power grade of single-phase work is improved. In another embodiment, the fourth selection switch RL is used4Is connected with a first selection switch RL1Second terminal of (1), fourth selection switch RL4Is connected with the second selection switch RL2For example, when the ac voltage detecting unit 120 detects that the ac side of the power converter is single-phase power, and when the single-phase input is the first-phase line/N input, the control unit 130 outputs the switch control signal to control the first selection switch RL1And a fourth selection switch RL4And a second selection switch RL2The first switch bridge arm and the second switch bridge arm are conducted to work, so that the power level of single-phase work is improved; when the single-phase input is the second phase live line/N input, the switch control signal output by the control unit 130 controls the second selection switch RL2And a fourth selection switch RL4The first switch bridge arm and the second switch bridge arm are conducted to work, thereby improving the work of single-phase workRate rating. In another embodiment, the fourth selection switch RL is used4Is connected with a first selection switch RL1Second terminal of (1), fourth selection switch RL4Is connected with the second selection switch RL2For example, when the ac voltage detecting unit 120 detects that the ac side of the power converter is single-phase power, and when the single-phase input is the first-phase line/N input, the control unit 130 outputs the switch control signal to control the first selection switch RL1And a fourth selection switch RL4The first switch bridge arm and the second switch bridge arm work, so that the power level of single-phase work is improved; when the single-phase input is the second phase live line/N input, the switch control signal output by the control unit 130 controls the second selection switch RL2And a fourth selection switch RL4And the first switch bridge arm and the second switch bridge arm work, so that the power grade of single-phase work is improved. When the ac voltage detecting unit 120 detects that the ac side of the power conversion apparatus is three-phase, the switching control signal output from the control unit 130 controls the first selection switch RL1A second selection switch RL2And a third selection switch RL3Are all turned on and are controlled so that the fourth selection switch RL4And (6) turning off. As above with the fourth selection switch RL4Connected to a first selection switch RL1First terminal or second terminal of (1) and second selection switch RL2For example, in an embodiment, the fourth selection switch RL can be further provided4Is connected with a first selection switch RL1First terminal or second terminal of (1), fourth selection switch RL4Is connected to the third selection switch RL3The control end of the first end or the second end receives the switch control signal output by the control unit 130, and the principle of single-phase and three-phase compatibility is the same as that described above, and is not described herein again. Or, in an embodiment, the fourth selection switch RL can also be4Is connected with the second selection switch RL2First terminal or second terminal of (1), fourth selection switch RL4Is connected to the third selection switch RL3A control terminal receiving the switch control signal outputted from the control unit 130,the principle of single-phase and three-phase compatibility is the same as that described above, and details are not repeated herein.
Further, the selection switch unit 110 includes a fourth selection switch RL4Further comprises a fifth selection switch RL5Fifth selector switch RL5Comprises a first terminal, a second terminal, a control terminal, a fifth selection switch RL5Is connected with a fourth selection switch RL4First terminal or second terminal of (1), fifth selection switch RL5Is not connected with the fourth selection switch RL4First or second terminals of selection switches on the branch to which it is connected, a fifth selection switch RL5The control terminal of (a) receives a switch control signal. Referring to FIG. 3, a fifth selection switch RL is shown for illustrating a power conversion apparatus according to another embodiment of the utility model5Is connected with a fourth selection switch RL4First terminal or second terminal of (1), fourth selection switch RL4The fifth selector switch RL is then connected between the first phase branch and the second phase branch5Is connected to a third selection switch RL located on the third phase branch3The first end or the second end of (a). Specifically, as shown in FIG. 3, the fifth selector switch RL5Is connected with a fourth selection switch RL4First terminal of (1), fifth selector switch RL5Is connected to the third selection switch RL3When the ac voltage detecting unit 120 detects that the ac side of the power conversion device is single-phase power and the single-phase input is the first-phase line/N input, the control unit 130 outputs the switch control signal to control the first selection switch RL1And a fourth selection switch RL4And a fifth selector switch RL5The first switch bridge arm, the second switch bridge arm and the third switch bridge arm are all switched on, so that the power grade of single-phase work is improved; when the single-phase input is the second phase live line/N input, the switch control signal output by the control unit 130 controls the second selection switch RL2And a fourth selection switch RL4First selection switch RL1And a fifth selector switch RL5The first switch bridge arm, the second switch bridge arm and the third switch bridge arm are all operated by conduction, thereby improving the work in single-phase operationRate rating. When the ac voltage detecting unit 120 detects that the ac side of the power conversion apparatus is three-phase, the switching control signal output from the control unit 130 controls the first selection switch RL1A second selection switch RL2And a third selection switch RL3Are all turned on and are controlled so that the fourth selection switch RL4And a fifth selector switch RL5And (6) turning off. Fifth selector switch RL5Working principles of other different connection modes and fourth selection switch RL4The working principle of the corresponding connection relationship is the same, and is not described in detail herein.
Referring to fig. 4, a schematic diagram of a power conversion device according to another embodiment of the utility model further includes a filter unit, and the filter unit can be connected between the live line incoming end and the selection switch unit 110. Or, the filter unit is connected between the selection switch unit 110 and the inductor (L)1、L2And L3) In the meantime. Alternatively, filter units are connected between the live line inlet terminal and the selection switch unit 110 and between the selection switch unit 110 and the inductor. As shown in fig. 4, a first filter unit 131 is connected between the live line inlet and the selection switch unit 110, and a second filter unit 132 is connected between the selection switch unit 110 and the inductor. The specific structure of the filter unit is not limited in the present application, and any suitable filter can be applied in the present invention. Please refer to fig. 5, which shows a filter unit 133 of a power conversion device according to another embodiment of the present invention. The neutral line connects the common node of the first and second capacitance units through the filter unit as described above.
In one embodiment, the first selection switch RL1A second selection switch RL2And a third selection switch RL3And a fourth selection switch RL4And a fifth selector switch RL5A relay, a metal-oxide semiconductor field effect transistor (MOSFET), or an Insulated Gate Bipolar Transistor (IGBT). Taking a metal-oxide semiconductor field effect transistor (MOSFET) as an example, the first terminal is a source or a drain, the corresponding second terminal is a drain or a source, and a third terminal is a gate.
In one embodiment, the switch transistors in the power conversion switch unit are metal-oxide semiconductor field effect transistors (MOSFETs) or Insulated Gate Bipolar Transistors (IGBTs), and as shown in fig. 5, the switch transistors in the power conversion switch unit are all metal-oxide semiconductor field effect transistors (Q)1To Q12). And the source electrode S of the upper pipe of each switch bridge arm is connected with the drain electrode D of the lower pipe to form the midpoint of the switch bridge arm, the drain electrode D of the upper pipe is the first end of the switch bridge arm, and the source electrode S of the lower pipe is the second end of the switch bridge arm. The drain D of the first switch in each bidirectional switch branch is connected with the drain D of the second switch, and the source S of the first switch and the source S of the second switch form two ends of the bidirectional switch branch.
The first capacitor unit and the second capacitor unit can both comprise only one capacitor, or a series and/or parallel connection of a plurality of capacitors, as shown in fig. 1, the first capacitor unit comprises a capacitor C1The second capacitor unit comprises a capacitor C2。
In one embodiment, the first selection switch RL1A second selection switch RL2And a third selector switch RL3Is connected in parallel with a resistor. Specifically, the resistor is connected between the first terminal and the second terminal of the corresponding selection switch. Specifically, when the ac side is single-phase power, the selection switch on the live wire incoming line of the single-phase power input needs to be connected in parallel with a resistor. As shown in FIG. 5, the first selection switch RL1And a resistor R1And (4) connecting in parallel.
In an embodiment of the application, a vehicle-mounted charger is further provided, which includes the above power conversion device, and converts single-phase ac power or three-phase ac power input from an ac side into dc power to charge a high-voltage power battery pack in an electric vehicle.
In addition, the power conversion device can be applied to any occasions needing alternating current-direct current conversion.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the utility model has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. A power conversion apparatus, comprising:
the bidirectional switch branch circuit comprises two switch tubes which are connected in series, the first end of the selection switch of each phase branch circuit is connected with the live wire inlet end, the second end of the selection switch of each phase branch circuit is connected with the first end of the inductor, and the second end of the inductor is connected with the midpoint of the switch bridge arm and the first end of the bidirectional switch branch circuit; the bidirectional switch branch circuit comprises a first capacitor unit and a second capacitor unit which are connected in series, the second ends of the bidirectional switch branch circuit are connected with a common node of the first capacitor unit and the second capacitor unit, the first ends of the switch bridge arms and the first ends of the capacitor units are connected with each other, and the second ends of the switch bridge arms and the first ends of the capacitor units are connected with each other; and the neutral line comprises a neutral line inlet end, the neutral line inlet end is connected with a common node of the first capacitor unit and the second capacitor unit, and the three live line inlet ends and the neutral line inlet end form an alternating current side of the power conversion device.
2. The power conversion device according to claim 1, wherein the first phase branch comprises a first phase live wire incoming line end, a first selection switch, a first inductor, a first switch bridge arm and a first bidirectional switch branch, a first end of the first selection switch is connected with the first phase live wire incoming line end, a second end of the first selection switch is connected with a first end of the first inductor, the first switch bridge arm comprises two switch tubes connected in series, a connection point of the two switch tubes forms a midpoint of the first switch bridge arm, a second end of the first inductor is connected with the midpoint of the first switch bridge arm, the first bidirectional switch branch comprises two switch tubes connected in series, and a first end of the first bidirectional switch branch is connected with the midpoint of the first switch bridge arm; the second phase branch comprises a second phase live wire inlet end, a second selection switch, a second inductor, a second switch bridge arm and a second bidirectional switch branch, the first end of the second selection switch is connected with the second phase live wire inlet end, the second end of the second selection switch is connected with the first end of the second inductor, the second switch bridge arm comprises two switch tubes which are connected in series, the connection point of the two switch tubes forms the midpoint of the second switch bridge arm, the second end of the second inductor is connected with the midpoint of the second switch bridge arm, the second bidirectional switch branch comprises two switch tubes which are connected in series, and the first end of the second bidirectional switch branch is connected with the midpoint of the second switch bridge arm; the third phase branch comprises a third phase live wire inlet end, a third selection switch, a third inductor, a third switch bridge arm and a third bidirectional switch branch, the first end of the third selection switch is connected with the third phase live wire inlet end, the second end of the third selection switch is connected with the first end of the third inductor, the third switch bridge arm comprises two switch tubes which are connected in series, the connection point of the two switch tubes forms the middle point of the third switch bridge arm, the second end of the third inductor is connected with the middle point of the third switch bridge arm, the third bidirectional switch branch comprises two switch tubes which are connected in series, the first end of the third bidirectional switch branch is connected with the middle point of the third switch bridge arm, and the second ends of the first to third bidirectional switch branches are connected with the common node of the first capacitor unit and the second capacitor unit.
3. The power conversion device according to claim 2, further comprising a fourth selection switch, wherein the fourth selection switch comprises a first terminal, a second terminal and a control terminal, the first terminal of the fourth selection switch is connected to the first terminal or the second terminal of the first selection switch, the second terminal of the fourth selection switch is connected to the first terminal or the second terminal of the second selection switch, and the control terminal receives the switch control signal.
4. The power conversion device according to claim 2, further comprising a fourth selection switch, wherein the fourth selection switch comprises a first terminal, a second terminal and a control terminal, the first terminal of the fourth selection switch is connected to the first terminal or the second terminal of the first selection switch, the second terminal of the fourth selection switch is connected to the first terminal or the second terminal of the third selection switch, and the control terminal receives the switch control signal.
5. The power conversion device according to claim 2, further comprising a fourth selection switch, wherein the fourth selection switch comprises a first terminal, a second terminal and a control terminal, the first terminal of the fourth selection switch is connected to the first terminal or the second terminal of the second selection switch, the second terminal of the fourth selection switch is connected to the first terminal or the second terminal of the third selection switch, and the control terminal receives the switch control signal.
6. The power conversion device according to any one of claims 3 to 5, further comprising a fifth selection switch, wherein the fifth selection switch comprises a first terminal, a second terminal, and a control terminal, the first terminal of the fifth selection switch is connected to the first terminal or the second terminal of the fourth selection switch, the second terminal of the fifth selection switch is connected to the first terminal or the second terminal of the selection switch on the branch not connected to the fourth selection switch, and the control terminal of the fifth selection switch receives the switch control signal.
7. The power converter according to claim 1, further comprising an ac voltage detecting unit connected to the live line terminal and the neutral line terminal for detecting whether the ac side of the power converter is single-phase power or three-phase power.
8. The power conversion device of claim 1, wherein the three-phase grid on the ac side is unbalanced when the power conversion device is operating in ac-to-dc conversion.
9. The power conversion device of claim 1, wherein when the power conversion device operates in dc-to-ac conversion, the ac side is an unbalanced load.
10. The power conversion device according to claim 1, wherein a neutral line connects the common node of the first capacitor unit and the second capacitor unit via the filter unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121512969.9U CN215378785U (en) | 2021-07-05 | 2021-07-05 | Power supply conversion device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121512969.9U CN215378785U (en) | 2021-07-05 | 2021-07-05 | Power supply conversion device |
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| CN215378785U true CN215378785U (en) | 2021-12-31 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115117986A (en) * | 2022-06-29 | 2022-09-27 | 华为数字能源技术有限公司 | Charging module, method and charging equipment |
| WO2024108979A1 (en) * | 2022-11-25 | 2024-05-30 | 邯郸美的制冷设备有限公司 | Voltage control method and apparatus, and household appliance, storage medium and program |
-
2021
- 2021-07-05 CN CN202121512969.9U patent/CN215378785U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115117986A (en) * | 2022-06-29 | 2022-09-27 | 华为数字能源技术有限公司 | Charging module, method and charging equipment |
| WO2024108979A1 (en) * | 2022-11-25 | 2024-05-30 | 邯郸美的制冷设备有限公司 | Voltage control method and apparatus, and household appliance, storage medium and program |
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Address after: 313300 No. 505, Wenchang Road, Dipu street, Anji County, Huzhou City, Zhejiang Province (self declaration) Patentee after: Zhejiang Fute Technology Co.,Ltd. Address before: 310012 1-5 / F, building 5, 6 xiyuanjiu Road, Xihu District, Hangzhou City, Zhejiang Province Patentee before: HANGZHOU EV-TECH CO.,LTD. |