CN213990500U - Auxiliary power supply circuit and power supply system - Google Patents
Auxiliary power supply circuit and power supply system Download PDFInfo
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- CN213990500U CN213990500U CN202023161326.2U CN202023161326U CN213990500U CN 213990500 U CN213990500 U CN 213990500U CN 202023161326 U CN202023161326 U CN 202023161326U CN 213990500 U CN213990500 U CN 213990500U
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Abstract
The embodiment of the utility model provides an auxiliary power supply circuit and power supply system, this auxiliary power supply circuit includes: the system comprises a plurality of MMC sub-modules, a plurality of electric energy conversion units and a control module; the MMC sub modules are connected in series step by step through input ends, and the input ends of the whole MMC sub modules connected in series are respectively connected with high-voltage direct-current voltage; the output end of each MMC sub-module is connected with the input end of an electric energy conversion unit, the output end of the electric energy conversion unit is connected with a control module in parallel, and the plurality of MMC sub-modules respectively input the voltage converted from the high-voltage direct-current voltage into the electric energy conversion unit; the control module is powered on according to the output voltage of the electric energy conversion unit so as to provide auxiliary power supply for the electric equipment. Because the direct electricity taking from the high-voltage side is not needed, a high-voltage reduction module with larger volume is not needed, and the volume of the switching power supply is reduced. Meanwhile, a special extra power supply is not needed to be configured for supplying power, the circuit design is simple, and the cost is low.
Description
Technical Field
The embodiment of the utility model provides a relate to the power supply unit field, especially relate to an auxiliary power supply circuit and power supply system.
Background
The conventional switching power supply circuit generally comprises an input filter circuit, a power conversion circuit, a control circuit, an output rectifying filter circuit and an auxiliary power supply circuit. The auxiliary power supply circuit generally carries low-voltage supply of the control circuit and the driving circuit, so that the stable and reliable operation of the circuit is guaranteed, and the auxiliary power supply circuit is an essential part of the switching power supply circuit.
At present, in the conventional switching power supply, the power supply source of the auxiliary power supply is the high-voltage side of the input end of the auxiliary power supply, and then the auxiliary power supply circuit is powered after the voltage of the auxiliary power supply is reduced by a first-stage voltage or even a second-stage voltage. In other auxiliary power supplies, power need not be supplied from the high voltage side, but rather dedicated additional power supplies are provided.
However, the inventors found that the prior art has at least the following technical problems: the primary voltage reduction and even the secondary voltage reduction at the rear end of the high-voltage side need to be provided with a large high-voltage reduction module, so that the size of the switching power supply is increased; in addition, a special extra power supply is configured for supplying power, the circuit design is complex, and the overhead cost is increased.
SUMMERY OF THE UTILITY MODEL
An embodiment of the utility model provides an auxiliary power supply circuit and power supply system, auxiliary power supply circuit volume is less, has reduced switching power supply's volume, does not need extra mains operated simultaneously, and circuit design is simple, has reduced the overhead cost.
In a first aspect, an embodiment of the present invention provides an auxiliary power circuit, including:
the system comprises a plurality of MMC sub-modules, a plurality of electric energy conversion units and a control module;
the MMC sub modules are connected in series step by step through input ends, and the input ends of the whole MMC sub modules connected in series are respectively connected with high-voltage direct-current voltage;
the output end of each MMC sub-module is connected with the input end of an electric energy conversion unit, the output end of the electric energy conversion unit is connected with the control module in parallel, and the plurality of MMC sub-modules respectively input the voltage converted from the high-voltage direct-current voltage into the electric energy conversion unit; the control module is powered on according to the output voltage of the electric energy conversion unit so as to provide auxiliary power supply for the electric equipment.
In a possible embodiment of the present invention, each MMC sub-module includes a first switch tube, a second switch tube, and an output capacitor, wherein a drain of the first switch tube is connected to a source of the second switch tube, and the source of the first switch tube and the drain of the second switch tube are respectively connected to two ends of the output capacitor; the MMC sub-modules are connected with the source electrode of the first switching tube of another MMC sub-module in series step by step through the connecting point of the drain electrode of the first switching tube of one MMC sub-module and the source electrode of the second switching tube; the connecting point of the drain electrode of the first switch tube of one MMC sub-module and the source electrode of the second switch tube of the MMC sub-modules at two ends of the plurality of serially connected MMC sub-modules is connected with the positive electrode of high-voltage direct current voltage, and the source electrode of the first switch tube of the other MMC sub-module is connected with the negative electrode of the high-voltage direct current voltage; and the two ends of the output capacitor are the output ends of each MMC sub-module.
The utility model discloses an in the possible embodiment, the MMC submodule piece still wraps first diode and second diode, wherein the positive pole of first diode with the source electrode of first switch tube is connected, the negative pole with the drain electrode of first switch tube is connected, wherein the positive pole of second diode with the source electrode of second switch tube is connected, the negative pole with the drain electrode of second switch tube is connected.
In one possible embodiment of the present invention, the control module includes a sub-controller, a main controller, a self-starting capacitor, and a starting module; the sub-controllers are connected with the output ends of the electric energy conversion units in parallel; two ends of the self-starting capacitor are connected with the output end of each electric energy conversion unit in parallel, two ends of the self-starting capacitor are also connected with the input end of the starting module, and the output end of the starting module is connected with the main controller; and the IO port of the sub-controller is connected with the starting module and used for controlling the starting of the starting module according to the stability of the output voltage of each electric energy conversion unit to electrify the main controller so as to provide auxiliary power supply for electric equipment.
In a possible embodiment of the present invention, the control module further includes: and the current limiting resistor is arranged at the output end of the self-starting capacitor connected with the electric energy conversion unit.
In one possible embodiment of the present invention, the output end of each of the power conversion units includes a positive electrode and a negative electrode; and the anode of the third diode is connected with the electric energy conversion unit.
In one possible embodiment of the present invention, each of the power conversion units includes a non-isolated power conversion module and an isolated power conversion module;
the output end of the non-isolated electric energy conversion module is connected with the input end of the isolated electric energy conversion module; the input end of the non-isolated electric energy conversion module is the input end of the electric energy conversion unit, and the output end of the isolated electric energy conversion module is the output end of the electric energy conversion unit.
In one possible embodiment of the present invention, the non-isolated power conversion module is a DC-DC non-isolated voltage reducer; the isolated electric energy conversion module is a DC-DC isolated step-down transformer.
In a possible embodiment of the present invention, the number of MMC submodules is 3.
In a second aspect, an embodiment of the present invention provides a power supply system, including: an auxiliary power supply circuit as described above in the first aspect and in various possible implementations of the first aspect.
The embodiment of the utility model provides an auxiliary power supply circuit and power supply system, the auxiliary power supply circuit that this auxiliary power supply circuit embodiment provided, owing to do not need directly to get the electricity from the high-pressure side, need not set up the great high pressure step-down module of volume, and the voltage after getting the electricity is lower, and electric energy conversion unit power demand diminishes, and electric energy conversion unit volume can be very little, has reduced switching power supply's volume. Meanwhile, the auxiliary power supply circuit directly performs electric energy conversion from the high-voltage direct-current voltage input side, a special extra power supply is not required to be configured for power supply, the circuit design is simple, and the overhead cost is reduced.
Drawings
In order to more clearly illustrate the embodiments of the present invention 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 described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive labor.
Fig. 1 is a schematic structural diagram of an auxiliary power supply circuit according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of another auxiliary power supply circuit according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
In the conventional switching power supply, the auxiliary power supply mainly has two power sources. One is to directly get electricity from high voltage, but needs to supply power to the auxiliary power circuit after the voltage is reduced by a first stage or even a second stage of the rear end. Alternatively, a dedicated additional power supply is provided. However, the primary or even secondary voltage reduction at the rear end of the high-voltage side requires a large high-voltage reduction module, which increases the size of the switching power supply; in addition, a special extra power supply is configured for supplying power, the circuit design is complex, and the overhead cost is increased.
In order to solve the technical problem, the utility model provides an auxiliary power supply circuit establishes ties through the MMC submodule piece and acquires the voltage respectively from high voltage direct current voltage, then will obtain respective electric energy conversion unit of voltage input separately, then control module goes up the electricity according to electric energy conversion unit's output voltage to provide supplementary power supply to the consumer. Because the direct electricity taking from the high-voltage side is not needed, a high-voltage reduction module with a large size is not needed, the voltage after the electricity taking is low, the power requirement of the electric energy conversion unit is reduced, the size of the electric energy conversion unit is small, and the size of the switching power supply is reduced. Meanwhile, the auxiliary power supply circuit directly performs electric energy conversion from the high-voltage direct-current voltage input side, a special extra power supply is not required to be configured for power supply, the circuit design is simple, and the overhead cost is reduced.
Referring to fig. 1, fig. 1 is a schematic structural diagram of an auxiliary power supply circuit according to an embodiment of the present invention. The auxiliary power supply circuit provided by the embodiment comprises:
a plurality of MMC sub-modules 100, a plurality of power conversion units 200, and a control module 300. The MMC sub-module 100 is a Modular Multilevel Converter (Modular Multilevel Converter) sub-module. The power conversion unit 200 is one or more voltage reducers connected in series. Optionally, the power conversion unit 200 is a low-power and small-volume voltage reducer.
Wherein, a plurality of MMC submodule pieces 100 establish ties step by step through the input, and the holistic input of MMC submodule piece after the series connection inserts high voltage direct current voltage respectively. As shown in FIG. 1, the input terminals of the MMC sub-modules after series connection are V + and V-.
The output end of each MMC sub-module 100 is connected with the input end of an electric energy conversion unit 200, the output end of the electric energy conversion unit 200 is connected with the control module 300 in parallel, and the plurality of MMC sub-modules 100 respectively input the voltage converted from the high-voltage direct-current voltage into the electric energy conversion unit 200. The control module 300 is powered up according to the output voltage of the power conversion unit 200 to provide auxiliary power for the electric device.
In the present embodiment, each MMC submodule 100 includes a first switching tube 101, a second switching tube 102, and an output capacitor 103. The drain of the first switch tube 101 is connected to the source of the second switch tube 102, and the source of the first switch tube 101 and the drain of the second switch tube 102 are connected to two ends of the output capacitor 103, respectively.
The plurality of MMC sub-modules 100 are connected with the source electrode of the first switching tube 101 of another MMC sub-module in series step by step through the connecting point of the drain electrode of the first switching tube 101 and the source electrode of the second switching tube 102 of one MMC sub-module. The connecting point of the drain of the first switch tube of one of the MMC sub-modules at the two ends of the plurality of MMC sub-modules 101 after series connection and the source of the second switch tube is connected to the positive pole of the high voltage direct current voltage, and the source of the first switch tube 101 of the other MMC sub-module is connected to the negative pole of the high voltage direct current voltage.
And the two ends of the output capacitor 103 are the output ends of each MMC sub-module.
In this embodiment, the number of the MMC sub-modules is 3. As shown in fig. 1, S2, S4 and S6 are first switching tubes. S1, S3 and S5 are second switch tubes. C1, C2, and C3 are output capacitances. The connection point of the drain electrode of S2 and the source electrode of S1 is connected to the positive pole of high-voltage direct current voltage, and the source electrode of S6 is connected to the negative pole of high-voltage direct current voltage. Two ends of C1, C2 and C3 are the output ends of each MMC sub-module.
In the embodiment, the auxiliary power supply circuit can be used for auxiliary power supply of an underwater power supply in the field of submarine observation networks. The high-voltage direct current voltage supplies power for an underwater power supply which supplies power for electric equipment. When the underwater power supply fails, the auxiliary power supply supplies power. When the auxiliary power supply needs to be started, a starting signal is sent to the MMC sub-module 100, the MMC sub-module 100 is started to start the voltage input electric energy conversion unit 200 converted from the high-voltage direct current voltage, and the electric energy conversion unit 200 controls the module 300 to be powered on according to the output voltage of the electric energy conversion unit 200 so as to provide auxiliary power supply for the electric equipment.
Specifically, take the number of the MMC sub-modules as 3 as an example. When the auxiliary power supply needs to be started, a switching signal is sent to S1-S6, so that the switching tubes S1, S3 and S5 are switched on, S2, S4 and S6 are switched off, C1, C2 and C3 start charging, and after the voltages output to the control module by the C1, C2 and C3 are stabilized, the control module 300 is powered on to provide auxiliary power supply for the electric equipment.
It can be known from the above description that the auxiliary power supply circuit that this embodiment provided, because do not need directly to get the electricity from the high-pressure side, do not need to set up the great high-pressure step-down module of volume, and the voltage after getting the electricity is lower, and electric energy conversion unit power demand diminishes like this, and electric energy conversion unit volume can be very little, has reduced switching power supply's volume. Meanwhile, the auxiliary power supply circuit directly performs electric energy conversion from the high-voltage direct-current voltage input side, a special extra power supply is not required to be configured for power supply, the circuit design is simple, and the overhead cost is reduced.
Referring to fig. 1, in a possible embodiment of the present invention, the MMC sub-module 100 further includes a first diode 104 and a second diode 105, wherein an anode 104 of the first diode is connected to a source of the first switch tube 101, a cathode of the first diode is connected to a drain of the first switch tube 101, and an anode of the second diode 105 is connected to a source of the second switch tube 102, and a cathode of the second diode is connected to a drain of the second switch tube 102.
Continuing with the example that the number of MMC sub-modules is 3, in fig. 1, D5, D7, and D9 are first diodes. D4, D6, and D8 are second diodes.
In the present embodiment, the first diode 104 and the second diode 105 may be diodes of the same type, or may be diodes of different types, which is not limited to the present invention.
By arranging the first diode and the second diode, the condition that the bridge arm current of the MMC sub-module lacks a necessary reverse path after the first switch tube and the second switch tube are subjected to destructive disconnection is prevented.
Referring to fig. 2, fig. 2 is a schematic structural diagram of another auxiliary power supply circuit according to an embodiment of the present invention. On the basis of fig. 1, the control module of the auxiliary power supply circuit provided in this embodiment includes:
a sub-controller 301, a main controller 302, a self-starting capacitor 303 and a starting module 304;
wherein the sub-controller 301 is connected in parallel with the output terminals of the respective power conversion units 200.
Two ends of the self-starting capacitor 303 are connected in parallel with output ends of the electric energy conversion units 200, two ends of the self-starting capacitor 303 are further connected to an input end of the starting module 304, and an output end of the starting module 304 is connected with the main controller 302.
The IO port of the sub-controller 301 is connected to the starting module 304, and is configured to control the starting module 304 to start to power up the main controller 302 according to the stability of the output voltage 200 of each energy conversion unit, so as to provide auxiliary power for the electric device.
In this embodiment, the sub-controller 301 and the main controller 302 may be a single chip microcomputer or a micro processing unit. The type of the self-starting capacitor 303 is not limited, and can be set according to requirements.
The starting module 304, which may be an isolation power conversion module, is used to implement DC-DC voltage stabilization isolation, and mainly ensures the stability of the main controller power supply voltage.
Continuing to take the example that the number of the MMC submodules is 3, when the auxiliary power supply needs to be started, a switching signal is sent to S1-S6, when the switching tubes S1, S3 and S5 are turned on, and S2, S4 and S6 are turned off, the C1, C2 and C3 start charging, the electric energy conversion units start working and enter a working state, all the electric energy conversion units supply power to the sub-controller 301, when the sub-controller 301 determines that the voltages output by the electric energy conversion units are stable, that is, when it is determined that the charging of the C1, the C2 and the C3 is completed, the input end of the auxiliary power supply circuit completes the establishment of the voltage. When the sub-controller 301 determines that the input voltage is completely established, the control start module 304 starts, the self-start capacitor 303 (C4 in the figure) supplies power to the main controller 302, and the main controller 302 powers up to provide auxiliary power to the electric device.
As can be seen from the above description, in the process of starting charging to a steady state of the auxiliary power circuit provided in this embodiment, before the output capacitor is completely charged, the start module 304 does not operate, and the main controller 302 is not powered on; when the output capacitor is charged, and the system reaches a steady state, the sub-controller controls the start module 304 to start, so that the main controller 302 is powered on. Because the auxiliary power supply does not work when the input voltage is established, the auxiliary power supply is put into operation after the system is stabilized, the energy loss of the input end is reduced, and the system is more stable and reliable.
Referring to fig. 2, in a possible embodiment of the present invention, the control module further includes: a current limiting resistor 305 (R1 in the figure), wherein the current limiting resistor 305 is disposed at an output end of the self-starting capacitor 303 connected with the power conversion unit 200.
In this embodiment, the resistance of the current limiting resistor 305 may be set as required, and the present invention is not limited thereto.
The charging current of the self-starting capacitor is limited through the current limiting resistor, and the working stability of the self-starting capacitor is protected.
Referring to fig. 2, in one possible embodiment of the present invention, the output end of each power conversion unit 200 includes a positive electrode and a negative electrode; wherein the anode is provided with a third diode 400, and the anode of the third diode 400 is connected with the power conversion unit 200.
In this embodiment, continuing to take the example that the number of MMC submodules is 3, in the figure, D1, D2, and D3 are the third diodes.
The effects achieved by providing the third diode include: 1) the influence of a front isolation electric energy conversion module of the rear-stage main controller on a front-stage power supply is reduced; 2) reverse connection is prevented; 3) prevent the current from flowing back at the moment of power failure.
Referring to fig. 2, in one possible embodiment of the present invention, each power conversion unit 200 includes a non-isolated power conversion module 201 and an isolated power conversion module 202.
Wherein the output end of the non-isolated power conversion module 201 is connected with the input end of the isolated power conversion module 202; the input end of the non-isolated power conversion module 201 is the input end of the power conversion unit, and the output end of the isolated power conversion module 202 is the output end of the power conversion unit.
In this embodiment, the non-isolated power conversion module is a DC-DC non-isolated step-down transformer; the isolated electric energy conversion module is a DC-DC isolated step-down transformer.
The DC-DC non-isolation step-down transformer is used for DC-DC non-isolation step-down conversion, converts front-end high-voltage into rear-end medium-voltage and outputs the rear-end medium-voltage, and has higher isolation voltage.
The DC-DC isolation step-down transformer is used for DC-DC isolation step-down conversion, converts front-end non-isolation voltage into rear-end isolation voltage for output, and mainly plays a role in medium-low voltage conversion.
It should be noted that: the DC-DC non-isolated step-down transformer is generally an integrated step-down circuit, and the DC-DC isolated step-down transformer can adopt CN100A24 series modules and CCG-S single-path output series modules.
The utility model also provides an auxiliary power supply system, including the auxiliary power supply circuit that each above-mentioned embodiment provided.
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; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention.
Claims (10)
1. An auxiliary power supply circuit, comprising:
the system comprises a plurality of MMC sub-modules, a plurality of electric energy conversion units and a control module;
the MMC sub modules are connected in series step by step through input ends, and the input ends of the whole MMC sub modules connected in series are respectively connected with high-voltage direct-current voltage;
the output end of each MMC sub-module is connected with the input end of an electric energy conversion unit, the output end of the electric energy conversion unit is connected with the control module in parallel, and the plurality of MMC sub-modules respectively input the voltage converted from the high-voltage direct-current voltage into the electric energy conversion unit; the control module is powered on according to the output voltage of the electric energy conversion unit so as to provide auxiliary power supply for the electric equipment.
2. The auxiliary power supply circuit according to claim 1, wherein each MMC sub-module comprises a first switch tube, a second switch tube and an output capacitor, wherein a drain electrode of the first switch tube is connected with a source electrode of the second switch tube, and the source electrode of the first switch tube and the drain electrode of the second switch tube are respectively connected with two ends of the output capacitor;
the MMC sub-modules are connected with the source electrode of the first switching tube of another MMC sub-module in series step by step through the connecting point of the drain electrode of the first switching tube of one MMC sub-module and the source electrode of the second switching tube; the connecting point of the drain electrode of the first switch tube of one MMC sub-module and the source electrode of the second switch tube of the MMC sub-modules at two ends of the plurality of serially connected MMC sub-modules is connected with the positive electrode of high-voltage direct current voltage, and the source electrode of the first switch tube of the other MMC sub-module is connected with the negative electrode of the high-voltage direct current voltage;
and the two ends of the output capacitor are the output ends of each MMC sub-module.
3. The auxiliary power supply circuit of claim 2, wherein the MMC sub-module further comprises a first diode and a second diode, wherein the anode of the first diode is connected to the source of the first switch tube, the cathode of the first diode is connected to the drain of the first switch tube, the anode of the second diode is connected to the source of the second switch tube, and the cathode of the second diode is connected to the drain of the second switch tube.
4. The auxiliary power supply circuit as claimed in claim 2, wherein the control module comprises a sub-controller, a main controller, a self-starting capacitor and a starting module;
the sub-controllers are connected with the output ends of the electric energy conversion units in parallel;
two ends of the self-starting capacitor are connected with the output end of each electric energy conversion unit in parallel, two ends of the self-starting capacitor are also connected with the input end of the starting module, and the output end of the starting module is connected with the main controller;
and the IO port of the sub-controller is connected with the starting module and used for controlling the starting of the starting module according to the stability of the output voltage of each electric energy conversion unit to electrify the main controller so as to provide auxiliary power supply for electric equipment.
5. The auxiliary power supply circuit as claimed in claim 4, wherein the control module further comprises: and the current limiting resistor is arranged at the output end of the self-starting capacitor connected with the electric energy conversion unit.
6. The auxiliary power supply circuit according to any one of claims 1 to 5, wherein the output terminal of each power conversion unit includes a positive electrode and a negative electrode; and the anode of the third diode is connected with the electric energy conversion unit.
7. The auxiliary power supply circuit according to any one of claims 1 to 5, wherein each power conversion unit includes a non-isolated power conversion module and an isolated power conversion module;
the output end of the non-isolated electric energy conversion module is connected with the input end of the isolated electric energy conversion module; the input end of the non-isolated electric energy conversion module is the input end of the electric energy conversion unit, and the output end of the isolated electric energy conversion module is the output end of the electric energy conversion unit.
8. The auxiliary power circuit as claimed in claim 7, wherein the non-isolated power conversion module is a DC-DC non-isolated step-down transformer; the isolated electric energy conversion module is a DC-DC isolated step-down transformer.
9. The auxiliary power supply circuit according to claim 4, wherein the number of MMC sub-modules is 3.
10. A power supply system comprising an auxiliary power supply circuit as claimed in any one of claims 1 to 9.
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| CN114825971A (en) * | 2022-05-23 | 2022-07-29 | 湖南大学 | Expandable auxiliary power supply system suitable for submarine power supply and control method thereof |
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| CN114825971A (en) * | 2022-05-23 | 2022-07-29 | 湖南大学 | Expandable auxiliary power supply system suitable for submarine power supply and control method thereof |
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