CN210629355U - Direct current converter and direct current microgrid system - Google Patents
Direct current converter and direct current microgrid system Download PDFInfo
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- CN210629355U CN210629355U CN201921914505.3U CN201921914505U CN210629355U CN 210629355 U CN210629355 U CN 210629355U CN 201921914505 U CN201921914505 U CN 201921914505U CN 210629355 U CN210629355 U CN 210629355U
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Abstract
The present disclosure provides a direct current converter and a direct current micro-grid system. In the direct current converter, a working branch is arranged between the positive end of an input end and the positive end of a conversion circuit, and a plurality of charging branches are connected with the working branches in parallel, each charging branch corresponds to an input voltage, a charging capacitor is arranged between the positive end and the negative end of the conversion circuit, a first voltage sampling circuit collects the input voltage of the input end, a second voltage sampling circuit collects the charging voltage of the charging capacitor, a control circuit disconnects the working branches under the condition that the input voltage is collected by the first voltage sampling circuit, only the charging branches corresponding to the input voltage are conducted in the plurality of charging branches, if the charging voltage of the charging capacitor is greater than a preset threshold, the working branches are conducted, and the conducted charging branches are disconnected, so that the conversion circuit is started at preset time. The starting time of the direct current converter can be kept consistent when the input voltages are different.
Description
Technical Field
The disclosure relates to the technical field of circuits, in particular to a direct-current converter and a direct-current micro-grid system.
Background
Currently, dc microgrid buses have a number of different voltage levels. In order to meet the use requirement, the direct current high voltage on the direct current microgrid bus needs to be converted into the desired direct current low voltage through a direct current converter.
SUMMERY OF THE UTILITY MODEL
The inventor has noticed that, due to the fact that the dc microgrid bus has a plurality of different voltage levels, charging currents on charging branches in the dc converter are inconsistent, and therefore charging times of charging capacitors in the dc converter are inconsistent. This results in inconsistent start-up times of the dc converter, which affects the performance consistency of the dc converter.
Therefore, the scheme can ensure that the starting time of the direct current converter is kept consistent when the input voltages are different.
According to a first aspect of the embodiments of the present disclosure, there is provided a dc converter including an input terminal, a conversion circuit, a charging capacitor, a first voltage sampling circuit, a second voltage sampling circuit, and a control circuit, wherein: a working branch circuit and a plurality of charging branch circuits connected with the working branch circuit in parallel are arranged between the positive end of the input end and the positive end of the conversion circuit, each charging branch circuit corresponds to an input voltage, the resistance values of different charging branch circuits are different, the negative end of the input end is electrically connected with the negative end of the conversion circuit, and the charging capacitor is arranged between the positive end and the negative end of the conversion circuit; the first voltage sampling circuit is used for collecting the input voltage of the input end, and the second voltage sampling circuit is used for collecting the charging voltage of the charging capacitor; the control circuit disconnects the working branch circuits under the condition that the first voltage sampling circuit collects input voltage, only conducts the charging branch circuits corresponding to the input voltage in the plurality of charging branch circuits, conducts the working branch circuits under the condition that the charging voltage of the charging capacitor is greater than a preset threshold, and disconnects the charging branch circuits corresponding to the input voltage, so that the conversion circuit is started at preset time.
In some embodiments, each charging branch circuit is provided with a charging resistor and a charging switch, a first end of the charging resistor is electrically connected to a second end of the charging switch, a second end of the charging resistor is electrically connected to one of the positive end of the input terminal and the positive end of the conversion circuit, a first end of the charging switch is electrically connected to the other one of the positive end of the input terminal and the positive end of the conversion circuit, and a control end of the charging switch is electrically connected to a corresponding control end of the charging switch in the control circuit.
In some embodiments, if the first voltage is greater than the second voltage, a charging resistance value on the charging branch corresponding to the first voltage is greater than a charging resistance value on the charging branch corresponding to the second voltage.
In some embodiments, in a case where the control circuit sends the conduction control signal to the control terminal of the charging switch on the corresponding charging branch by designating the charging switch control terminal, the first terminal and the second terminal of the charging switch on the corresponding charging branch are electrically connected, resulting in conduction of the corresponding charging branch.
In some embodiments, in a case where the control circuit sends an off control signal to the control terminal of the charging switch on the corresponding charging branch by designating the charging switch control terminal, the first terminal and the second terminal of the charging switch on the corresponding charging branch are disconnected, resulting in the disconnection of the corresponding charging branch.
In some embodiments, the charge switch is a MOS transistor or a relay.
In some embodiments, a working switch is disposed on the working branch, a first end of the working switch is electrically connected to one of the positive terminal of the input terminal and the positive terminal of the converting circuit, a second end of the working switch is electrically connected to the other of the positive terminal of the input terminal and the positive terminal of the converting circuit, and a control end of the working switch is electrically connected to a working switch control end of the control circuit.
In some embodiments, in a case where the control circuit sends a conduction control signal to the control terminal of the operating switch through the control terminal of the operating switch, the first terminal and the second terminal of the operating switch are electrically connected, resulting in conduction of the operating branch.
In some embodiments, in the case that the control circuit sends an off control signal to the control terminal of the working switch through the control terminal of the working switch, the first terminal and the second terminal of the working switch are disconnected, resulting in the disconnection of the working branch.
In some embodiments, the working switch is a MOS transistor or a relay.
In some embodiments, a first input terminal of the first voltage sampling circuit is electrically connected to a positive terminal of the input terminals, a second input terminal of the first voltage sampling circuit is electrically connected to a negative terminal of the input terminals, and an output terminal of the first voltage sampling circuit is electrically connected to a first input terminal of the control circuit.
In some embodiments, the first voltage sampling circuit includes a first operational amplifier circuit, a first sampling resistor, and a second sampling resistor, a first end of the first sampling resistor is electrically connected to a first input terminal of the first operational amplifier circuit, a second end of the first sampling resistor is a first input terminal of the first voltage sampling circuit, a first end of the second sampling resistor is electrically connected to a second input terminal of the first operational amplifier circuit, a second end of the second sampling resistor is a second input terminal of the first voltage sampling circuit, and an output terminal of the first operational amplifier circuit is an output terminal of the first voltage sampling circuit.
In some embodiments, a first input terminal of the second voltage sampling circuit is electrically connected to the positive terminal of the inverter circuit, a second input terminal of the second voltage sampling circuit is electrically connected to the negative terminal of the inverter circuit, and an output terminal of the second voltage sampling circuit is electrically connected to the second input terminal of the control circuit.
In some embodiments, the second voltage sampling circuit includes a second operational amplifier circuit, a third sampling resistor, and a fourth sampling resistor, a first end of the third sampling resistor is electrically connected to a first input terminal of the second operational amplifier circuit, a second end of the third sampling resistor is a first input terminal of the second voltage sampling circuit, a first end of the fourth sampling resistor is electrically connected to a second input terminal of the second operational amplifier circuit, a second end of the fourth sampling resistor is a second input terminal of the second voltage sampling circuit, and an output terminal of the second operational amplifier circuit is an output terminal of the second voltage sampling circuit.
According to a second aspect of the embodiments of the present disclosure, there is provided a dc microgrid system comprising a dc converter as described in any of the above embodiments.
Other features of the present disclosure and advantages thereof will become apparent from the following detailed description of exemplary embodiments thereof, which proceeds with reference to the accompanying drawings.
Drawings
In order to more clearly illustrate the embodiments of the present disclosure or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, it is obvious that the drawings in the following description are only some embodiments of the present disclosure, and for those skilled in the art, other drawings can be obtained according to the drawings without inventive exercise.
Fig. 1 is a schematic diagram of a dc converter according to an embodiment of the present disclosure;
fig. 2 is a schematic diagram of a dc converter according to another embodiment of the present disclosure;
fig. 3 is a schematic structural diagram of a dc converter according to still another embodiment of the present disclosure.
Detailed Description
The technical solutions in the embodiments of the present disclosure will be clearly and completely described below with reference to the drawings in the embodiments of the present disclosure, and it is obvious that the described embodiments are only a part of the embodiments of the present disclosure, and not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the disclosure, its application, or uses. All other embodiments, which can be derived by a person skilled in the art from the embodiments disclosed herein without making any creative effort, shall fall within the protection scope of the present disclosure.
The relative arrangement of the components and steps, the numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present disclosure unless specifically stated otherwise.
Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description.
Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate.
In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.
Fig. 1 is a schematic structural diagram of a dc converter according to an embodiment of the present disclosure. As shown in fig. 1, the dc converter includes an input terminal 1, a conversion circuit 2, a charging capacitor C1, a first voltage sampling circuit 3, a second voltage sampling circuit 4, and a control circuit 5.
An operating branch 6 and a plurality of charging branches 71-7n connected with the operating branch 6 in parallel are arranged between the positive terminal of the input terminal 1 and the positive terminal of the conversion circuit 2. Wherein each branch circuit of charging corresponds an input voltage, and the resistance value on the branch circuit of charging is different for different.
The negative terminal of the input terminal 1 is electrically connected to the negative terminal of the inverter circuit 2. The charging capacitor C1 is provided between the positive terminal and the negative terminal of the inverter circuit 2.
The first voltage sampling circuit 3 is used for collecting the input voltage of the input end 1.
In some embodiments, a first input terminal of the first voltage sampling circuit 3 is electrically connected to the positive terminal of the input terminal 1, a second input terminal of the first voltage sampling circuit 3 is electrically connected to the negative terminal of the input terminal 1, and an output terminal of the first voltage sampling circuit is electrically connected to the first input terminal of the control circuit 5. Thereby supplying the value of the input voltage at input terminal 1 to control circuit 5.
The second voltage sampling circuit 4 is used for collecting the charging voltage of the charging capacitor C1.
In some embodiments, a first input terminal of the second voltage sampling circuit 4 is electrically connected to the positive terminal of the inverter circuit 2, a second input terminal of the second voltage sampling circuit 4 is electrically connected to the negative terminal of the inverter circuit 2, and an output terminal of the second voltage sampling circuit 4 is electrically connected to the second input terminal of the control circuit. Thereby supplying the charging voltage value of the charging capacitor 3 to the control circuit 5.
When the first voltage sampling circuit 3 collects that the input end 1 has the input voltage, the control circuit 5 turns off the working branch 6, and only the charging branch corresponding to the input voltage among the plurality of charging branches is turned on, so that the charging capacitor C1 is charged by the charging branch corresponding to the input voltage. In case the charging voltage of the charging capacitor C1 is greater than a preset threshold, the control circuit 5 switches the working branch 6 on and switches the charging branch corresponding to the input voltage off, so that the conversion circuit is started at a preset time.
In the dc converter provided in the above embodiment of the present disclosure, the charging branches are provided for different input voltages, and each charging branch is provided with a corresponding resistor, so that the charging time of the charging capacitor can be ensured to be the same and the start time of the conversion circuit is the same under different input voltages.
In some embodiments, as shown in fig. 1, a charging resistor and a charging switch are provided on each charging branch. For example, the charging branch 71 is provided with a charging resistor R1 and a charging switch Q1. A first terminal of the charging resistor R1 is electrically connected to a second terminal of the charging switch Q1, a second terminal of the charging resistor R1 is electrically connected to one of the positive terminal of the input terminal 1 and the positive terminal of the inverter circuit 2, and a first terminal of the charging switch Q1 is electrically connected to the other of the positive terminal of the input terminal 1 and the positive terminal of the inverter circuit 2. The control terminal of the charging switch Q1 is electrically connected to the corresponding charging switch control terminal in the control circuit 5. The other charging branches are connected with the same relationship with the charging branch 71. For example, the charging branch 7n is provided with a charging resistor Rn and a charging switch Qn.
In some embodiments, if the first voltage is greater than the second voltage, the charging resistance value of the charging branch corresponding to the first voltage is greater than the charging resistance value of the charging branch corresponding to the second voltage. Thus, the same start-up time of the conversion circuit can be ensured under different input voltages.
In some embodiments, the charging switch on each charging branch is a MOS (Metal Oxide Semiconductor) field effect transistor or a relay.
For example, in a case where the control circuit 5 sends the conduction control signal to the control terminal of the charging switch on the corresponding charging branch by designating the charging switch control terminal, the first terminal and the second terminal of the charging switch on the corresponding charging branch are electrically connected, resulting in conduction of the corresponding charging branch.
In addition, in the case that the control circuit 5 sends the disconnection control signal to the control terminal of the charging switch on the corresponding charging branch by designating the charging switch control terminal, the first terminal and the second terminal of the charging switch on the corresponding charging branch are disconnected, resulting in disconnection of the corresponding charging branch.
In some embodiments, as shown in fig. 1, a working switch Q0 is provided on working branch 6. A first terminal of the operating switch Q0 is electrically connected to one of the positive terminal of the input terminal 1 and the positive terminal of the inverter circuit 2, and a second terminal of the operating switch Q0 is electrically connected to the other of the positive terminal of the input terminal 1 and the positive terminal of the inverter circuit 2. The control terminal of the operating switch Q0 is electrically connected to the operating switch control terminal of the control circuit 5.
In some embodiments, the operating switch is a MOS transistor or a relay.
For example, in the case where the control circuit 5 sends a turn-on control signal to the control terminal of the operating switch Q0 through the operating switch control terminal, the first terminal and the second terminal of the operating switch Q0 are electrically connected, resulting in the operating branch 6 being turned on.
Further, in case the control circuit 5 sends an off control signal to the control terminal of the operating switch Q0 through the operating switch control terminal, the first terminal and the second terminal of the operating switch Q0 are disconnected, resulting in the operating branch 6 being disconnected.
In some embodiments, the control signal sent by the control circuit 5 to the operating switch Q0 and the charging-on Q1-Qn is a PWM (Pulse Width Modulation) signal.
Fig. 2 is a schematic structural diagram of a dc converter according to another embodiment of the present disclosure. Fig. 2 is different from fig. 1 in that, in the embodiment shown in fig. 2, the first voltage sampling circuit 3 includes a first operational amplifier circuit OP1, a first sampling resistor R31, and a second sampling resistor R32.
A first end of the first sampling resistor R31 is electrically connected to a first input end of the first operational amplifier circuit OP1, and a second end of the first sampling resistor R31 is a first input end of the first voltage sampling circuit 3. A first end of the second sampling resistor R32 is electrically connected to a second input end of the first operational amplifier circuit OP1, a second end of the second sampling resistor R32 is a second input end of the first voltage sampling circuit 3, and an output end of the first operational amplifier circuit OP1 is an output end of the first voltage sampling circuit 3.
In some embodiments, as shown in fig. 2, the second voltage sampling circuit 4 includes a second operational amplifier circuit OP2, a third sampling resistor R41, and a fourth sampling resistor R42.
A first end of the third sampling resistor R41 is electrically connected to a first input end of the second operational amplifier circuit OP2, and a second end of the third sampling resistor R41 is a first input end of the second voltage sampling circuit 4. A first end of the fourth sampling resistor R42 is electrically connected to the second input end of the second operational amplifier circuit OP2, and a second end of the fourth sampling resistor R42 is the second input end of the second voltage sampling circuit 4. The output terminal of the second operational amplifier circuit OP2 is the output terminal of the second voltage sampling circuit 4.
Fig. 3 is a schematic structural diagram of a dc converter according to still another embodiment of the present disclosure.
As shown in fig. 3, if the dc microgrid bus has two voltage levels of 750V and 400V, two charging branches 71, 72 are provided in the dc converter, wherein the charging branch 71 corresponds to the voltage level of 750V and the charging branch 72 corresponds to the voltage level of 400V. As an example, in fig. 3, the switches in the working branch 6 and the charging branches 71 and 72 are MOS transistors.
In the starting stage, the control circuit 5 selects the charging branch 71 to charge the charging capacitor C1 according to the input voltage of the input terminal 1 reported by the first voltage sampling circuit 3, if the input voltage is 750V. In this case, the control circuit 5 continuously sends a high signal to the switch Q1 on the working branch 71, so that the switch Q1 is turned on, thereby controlling the working branch 71 to be turned on. The control circuit 5 continuously sends a low signal to the switch Q0 on the working branch 6 so that the switch Q0 is turned off, thereby controlling the working branch 6 to be turned off. In addition, the control circuit 5 continuously sends a low signal to the switch Q2 on the charging branch 72, so that the switch Q2 is turned off, thereby controlling the working branch 72 to be turned off.
The second voltage sampling circuit 4 collects the charging voltage across the charging capacitor C1. If the charging voltage of the charging capacitor C1 reaches a predetermined threshold (e.g., 308V), the converter circuit is enabled. In this case, the control circuit 5 sends a high signal to the switch Q0 on the working branch 6 continuously, so that the switch Q0 is turned on, thereby controlling the working branch 6 to be turned on. In addition, the control circuit 5 continuously sends a low signal to the switch Q1 on the charging branch 71, so that the switch Q1 is turned off, thereby controlling the working branch 71 to be turned off.
It should be noted that by turning off Q1, the energy loss caused by the current passing through charging branch 71 can be effectively reduced.
The present disclosure also provides a dc microgrid system. The direct current micro-grid system comprises a direct current converter as shown in any one of figures 1 to 3.
The description of the present disclosure has been presented for purposes of illustration and description, and is not intended to be exhaustive or limited to the disclosure in the form disclosed. Many modifications and variations will be apparent to practitioners skilled in this art. The embodiment was chosen and described in order to best explain the principles of the disclosure and the practical application, and to enable others of ordinary skill in the art to understand the disclosure for various embodiments with various modifications as are suited to the particular use contemplated.
Claims (15)
1. A DC converter, comprising an input terminal, a conversion circuit, a charging capacitor, a first voltage sampling circuit, a second voltage sampling circuit, and a control circuit, wherein:
a working branch circuit and a plurality of charging branch circuits connected with the working branch circuit in parallel are arranged between the positive end of the input end and the positive end of the conversion circuit, each charging branch circuit corresponds to an input voltage, the resistance values of different charging branch circuits are different, the negative end of the input end is electrically connected with the negative end of the conversion circuit, and the charging capacitor is arranged between the positive end and the negative end of the conversion circuit;
the first voltage sampling circuit is used for collecting the input voltage of the input end, and the second voltage sampling circuit is used for collecting the charging voltage of the charging capacitor;
the control circuit disconnects the working branch circuits under the condition that the first voltage sampling circuit collects input voltage, only conducts the charging branch circuits corresponding to the input voltage in the plurality of charging branch circuits, conducts the working branch circuits under the condition that the charging voltage of the charging capacitor is greater than a preset threshold, and disconnects the charging branch circuits corresponding to the input voltage, so that the conversion circuit is started at preset time.
2. The DC converter according to claim 1,
each is charged and is equipped with charging resistor and charge switch on the branch road, charging resistor's first end with charge switch's second end electricity is connected, charging resistor's second end with the positive terminal of input with one in the positive terminal of converting circuit is connected, charge switch's first end with the positive terminal of input with another in the positive terminal of converting circuit is connected electrically, charge switch's control end with the charge switch control end electricity that corresponds among the control circuit is connected.
3. The DC converter according to claim 2,
if the first voltage is greater than the second voltage, the charging resistance value of the charging branch corresponding to the first voltage is greater than the charging resistance value of the charging branch corresponding to the second voltage.
4. The DC converter according to claim 2,
and under the condition that the control circuit sends a conduction control signal to the control end of the charging switch on the corresponding charging branch circuit through the appointed charging switch control end, the first end and the second end of the charging switch on the corresponding charging branch circuit are electrically connected, so that the corresponding charging branch circuit is conducted.
5. The DC converter according to claim 4,
under the condition that the control circuit sends a disconnection control signal to the control end of the charging switch on the corresponding charging branch circuit through the appointed charging switch control end, the first end and the second end of the charging switch on the corresponding charging branch circuit are disconnected, and the corresponding charging branch circuit is disconnected.
6. The DC converter according to claim 5,
the charging switch is an MOS tube or a relay.
7. The DC converter according to claim 1,
the working branch circuit is provided with a working switch, the first end of the working switch is electrically connected with the positive terminal of the input end and one of the positive terminals of the conversion circuit, the second end of the working switch is electrically connected with the positive terminal of the input end and the other one of the positive terminals of the conversion circuit, and the control end of the working switch is electrically connected with the control end of the working switch of the control circuit.
8. The DC converter according to claim 7,
and under the condition that the control circuit sends a conduction control signal to the control end of the working switch through the control end of the working switch, the first end and the second end of the working switch are electrically connected, so that the working branch circuit is conducted.
9. The DC converter according to claim 8,
and under the condition that the control circuit sends a disconnection control signal to the control end of the working switch through the control end of the working switch, the first end and the second end of the working switch are disconnected, so that the working branch is disconnected.
10. The DC converter according to claim 9,
the working switch is an MOS tube or a relay.
11. The DC-DC converter according to any one of claims 1 to 10,
the first input end of the first voltage sampling circuit is electrically connected with the positive end of the input end, the second input end of the first voltage sampling circuit is electrically connected with the negative end of the input end, and the output end of the first voltage sampling circuit is electrically connected with the first input end of the control circuit.
12. The DC converter according to claim 11,
first voltage sampling circuit includes first operational amplifier circuit, first sampling resistor and second sampling resistor, the first end of first sampling resistor with first operational amplifier circuit's first input electricity is connected, the second end of first sampling resistor does first voltage sampling circuit's first input, the first end of second sampling resistor with first operational amplifier circuit's second input electricity is connected, the second end of second sampling resistor does first voltage sampling circuit's second input, first operational amplifier circuit's output does first voltage sampling circuit's output.
13. The DC-DC converter according to any one of claims 1 to 10,
the first input end of the second voltage sampling circuit is electrically connected with the positive end of the conversion circuit, the second input end of the second voltage sampling circuit is electrically connected with the negative end of the conversion circuit, and the output end of the second voltage sampling circuit is electrically connected with the second input end of the control circuit.
14. The DC converter according to claim 13,
the second voltage sampling circuit comprises a second operational amplifier circuit, a third sampling resistor and a fourth sampling resistor, the first end of the third sampling resistor is electrically connected with the first input end of the second operational amplifier circuit, the second end of the third sampling resistor is the first input end of the second voltage sampling circuit, the first end of the fourth sampling resistor is electrically connected with the second input end of the second operational amplifier circuit, the second end of the fourth sampling resistor is the second input end of the second voltage sampling circuit, and the output end of the second operational amplifier circuit is the output end of the second voltage sampling circuit.
15. A dc microgrid system comprising a dc converter according to any of claims 1-14.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201921914505.3U CN210629355U (en) | 2019-11-08 | 2019-11-08 | Direct current converter and direct current microgrid system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921914505.3U CN210629355U (en) | 2019-11-08 | 2019-11-08 | Direct current converter and direct current microgrid system |
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| CN210629355U true CN210629355U (en) | 2020-05-26 |
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| CN201921914505.3U Active CN210629355U (en) | 2019-11-08 | 2019-11-08 | Direct current converter and direct current microgrid system |
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