CN114050606B - Voltage control device and switching power supply - Google Patents
Voltage control device and switching power supply Download PDFInfo
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- CN114050606B CN114050606B CN202111162676.7A CN202111162676A CN114050606B CN 114050606 B CN114050606 B CN 114050606B CN 202111162676 A CN202111162676 A CN 202111162676A CN 114050606 B CN114050606 B CN 114050606B
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- 238000010248 power generation Methods 0.000 claims abstract description 154
- 238000004146 energy storage Methods 0.000 claims abstract description 46
- 230000000295 complement effect Effects 0.000 claims description 21
- 238000010586 diagram Methods 0.000 description 8
- 238000000034 method Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000001914 filtration Methods 0.000 description 2
- 238000004891 communication Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
- H02J3/466—Scheduling the operation of the generators, e.g. connecting or disconnecting generators to meet a given demand
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J1/00—Circuit arrangements for dc mains or dc distribution networks
- H02J1/10—Parallel operation of dc sources
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P9/00—Arrangements for controlling electric generators for the purpose of obtaining a desired output
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention provides a voltage control device and a switching power supply. The voltage control apparatus includes: the energy storage device comprises a first switch module, a second switch module, an energy storage module and a control module; the first switch module and the second switch module are controlled by the control module; the first switch module, the energy storage module and the second switch module are connected in series; the input end of the first switch module is used for being connected with power generation equipment, and the output end of the second switch module is used for being connected with electric equipment; a control module for: when the power generation equipment is in a low-voltage state, the first switch module is controlled to be in a conducting state and the second switch module is controlled to be in a boosting working state, so that the power generation equipment boosts power supply to electric equipment; when the power generation equipment is in a high-voltage state, the first switch module is controlled to be in a step-down working state, and the second switch module is controlled to be in a conducting state, so that the power generation equipment can step down and supply power to electric equipment. The invention can improve the reliability of power supply of the power generation equipment.
Description
Technical Field
The invention relates to the technical field of voltage control of power generation equipment, in particular to a voltage control device and a switching power supply.
Background
In power supply systems, particularly wind power supply systems, there is generally a high-low voltage ride through requirement for power generation equipment. The low-voltage ride through requirement is that when the voltage drop of the grid-connected point of the wind power plant is caused by the fault or disturbance of the power generation equipment, electric equipment can run without off-grid in the voltage drop range. The high voltage ride through requirement is that when the voltage exceeds a certain value of rated voltage, the electric equipment can run without off-grid.
In the prior art, a protection circuit (Crowbar) is mostly adopted to meet the high-low voltage ride through requirement of the power generation equipment, and the Crowbar circuit is usually connected with a fully-controlled IGBT in series by adopting an uncontrollable rectifying three-phase diode rectifier bridge and is additionally provided with a current limiting resistor to meet the high-low voltage ride through requirement of the power generation equipment. However, the Crowbar circuit may cause the power generation device to absorb a large amount of reactive power, which affects the stable operation of the power generation device. That is, the Crowbar circuit adopted in the prior art can have certain potential safety hazards to meet the high-low voltage ride through requirements of power generation equipment.
Disclosure of Invention
The embodiment of the invention provides a voltage control device and a switching power supply, which are used for solving the problem that a Crowbar circuit is adopted to meet the high-low voltage ride through requirement of power generation equipment in the prior art, and certain potential safety hazards possibly exist.
In a first aspect, an embodiment of the present invention provides a voltage control apparatus, including: the energy storage device comprises a first switch module, a second switch module, an energy storage module and a control module; the first switch module and the second switch module are controlled by the control module;
the first input end of the first switch module is used for being connected with the first end of the power generation equipment, the second input end of the first switch module is used for being connected with the second end of the power generation equipment, the first output end of the first switch module is connected with the first input end of the second switch module, and the second output end of the first switch module is connected with the second input end of the second switch module;
The first output end of the second switch module is used for being connected with the first input end of the electric equipment, and the second output end of the second switch module is used for being connected with the second input end of the electric equipment;
The energy storage module is connected between the first output end of the first switch module and the first input end of the second switch module or between the second output end of the first switch module and the second input end of the second switch module; the control module is used for:
When the power generation equipment is in a low-voltage state, the first switch module is controlled to be in a conducting state and the second switch module is controlled to be in a boosting working state, so that the power generation equipment boosts and supplies power to electric equipment, and the electric equipment is ensured to work normally;
When the power generation equipment is in a high-voltage state, the first switch module is controlled to be in a voltage-reduction working state and the second switch module is controlled to be in a conducting state, so that the power generation equipment can reduce voltage and supply power to electric equipment, and the normal work of the electric equipment is ensured.
In one possible implementation, the first switch module includes a first switch unit and a second switch unit; the first switch unit and the second switch unit are controlled by the control module;
the first end of the first switch unit is connected with the first input end of the first switch module, and the second end of the first switch unit is connected with the first end of the second switch unit and the first output end of the first switch module respectively; the second end of the second switch unit is respectively connected with the second input end of the first switch module and the second output end of the first switch module;
The control module is specifically used for:
when the power generation equipment is in a low-voltage state, the first switch unit is controlled to be in a conducting state, and the second switch unit is controlled to be in an disconnecting state;
When the power generation equipment is in a high-voltage state, the first switch unit and the second switch unit are controlled so that the first switch module is in a voltage-reducing working state.
In one possible implementation, the first switching unit comprises a first switching tube and a second switching tube; the second switching unit comprises a third switching tube and a fourth switching tube; the first switching tube, the second switching tube, the third switching tube and the fourth switching tube are controlled by a control module;
The first end of the first switch tube is connected with the first end of the first switch unit, and the second end of the first switch tube is connected with the second end of the second switch tube; the first end of the second switch tube is connected with the second end of the first switch unit;
The first end of the third switching tube is connected with the first end of the second switching unit, and the second end of the third switching tube is connected with the second end of the fourth switching tube; the first end of the fourth switching tube is connected with the second end of the second switching unit;
The control module is specifically used for:
When the power generation equipment is in a low-voltage state, the first switching tube and the second switching tube are controlled to be both on, and the third switching tube and the fourth switching tube are controlled to be both off;
When the power generation equipment is in a high-voltage state, if the voltage waveform of the power generation equipment is in a positive half-wave, the first switching tube and the third switching tube are controlled to be complementary, and the second switching tube and the fourth switching tube are controlled to be conducted; and if the voltage waveform of the power generation equipment is in a negative half wave, controlling the first switching tube and the third switching tube to be conducted, and controlling the second switching tube and the fourth switching tube to be complementary.
In one possible implementation, the first switch module further comprises a first capacitive element connected between the first input of the first switch module and the second input of the first switch module. The first switch module further comprises a first capacitance unit connected between the first input terminal of the first switch module and the second input terminal of the first switch module.
In one possible implementation, the second switching module includes a third switching unit and a fourth switching unit; the third switch unit and the fourth switch unit are controlled by the control module;
The first end of the third switch unit is connected with the first end of the fourth switch unit and the first input end of the second switch module respectively, and the second end of the third switch unit is connected with the first output end of the second switch module; the second end of the fourth switch unit is respectively connected with the second input end of the second switch module and the second output end of the second switch module;
The control module is specifically used for:
When the power generation equipment is in a high-voltage state, the third switch unit is controlled to be in a conducting state, and the fourth switch unit is controlled to be in an disconnecting state;
When the power generation equipment is in a low-voltage state, the third switch unit and the fourth switch unit are controlled so that the second switch module is in a boosting working state.
In one possible implementation, the third switching unit comprises a fifth switching tube and a sixth switching tube; the fourth switching unit comprises a seventh switching tube and an eighth switching tube; the fifth switching tube, the sixth switching tube, the seventh switching tube and the eighth switching tube are controlled by a control module;
the first end of the fifth switching tube is connected with the first end of the third switching unit, and the second end of the fifth switching tube is connected with the second end of the sixth switching tube; the first end of the sixth switching tube is connected with the second end of the third switching unit;
The first end of the seventh switching tube is connected with the first end of the fourth switching unit, and the second end of the seventh switching tube is connected with the second end of the eighth switching tube; the first end of the eighth switching tube is connected with the second end of the fourth switching unit;
The control module is specifically used for:
When the power generation equipment is in a low-voltage state, if the voltage waveform of the power generation equipment is in a positive half-wave, the fifth switching tube and the eighth switching tube are controlled to be conducted, and the sixth switching tube and the seventh switching tube are controlled to be complementary; if the voltage waveform of the power generation equipment is in a negative half wave, the fifth switching tube and the eighth switching tube are controlled to be complementary, and the sixth switching tube and the seventh switching tube are controlled to be conducted;
when the power generation equipment is in a high-voltage state, the fifth switching tube and the sixth switching tube are controlled to be conducted, and the seventh switching tube and the eighth switching tube are controlled to be disconnected.
In one possible implementation, the second switch module further comprises a second capacitive unit connected between the first output of the second switch module and the second output of the second switch module.
In one possible implementation, the control module is further configured to:
When the power generation equipment is in a normal working state, the first switch module and the second switch module are controlled to be in a conducting state, so that the power generation equipment directly supplies power to the electric equipment, and the normal working of the electric equipment is ensured.
In one possible implementation, the energy storage module comprises at least one energy storage inductance.
In a second aspect, an embodiment of the present invention provides a switching power supply, including a voltage control apparatus according to any one of the first aspects above.
An embodiment of the present invention provides a voltage control apparatus, including: the energy storage device comprises a first switch module, a second switch module, an energy storage module and a control module; the first switch module and the second switch module are controlled by the control module; the first switch module, the energy storage module and the second switch module are connected in series; the input end of the first switch module is used for being connected with power generation equipment, and the output end of the second switch module is used for being connected with electric equipment. The control module is used for controlling the first switch module and the second switch module, so that the voltage of the power generation equipment can be increased when the power generation equipment is in a low-voltage state, the power generation equipment is guaranteed to normally supply power to the electric equipment, the voltage of the power generation equipment can be reduced when the power generation equipment is in a high-voltage state, the power generation equipment is guaranteed to normally supply power to the electric equipment, reactive power cannot be generated, the influence on the electric equipment cannot be caused, and the power supply reliability of the power generation equipment can be improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments or the description of the prior art will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of a first voltage control apparatus according to an embodiment of the present invention;
Fig. 2 is a schematic structural diagram of a second voltage control apparatus according to an embodiment of the present invention;
fig. 3 is a schematic circuit diagram of a voltage control apparatus according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a third voltage control apparatus according to an embodiment of the present invention.
Detailed Description
In order to make the present solution better understood by those skilled in the art, the technical solution in the present solution embodiment will be clearly described below with reference to the accompanying drawings in the present solution embodiment, and it is obvious that the described embodiment is an embodiment of a part of the present solution, but not all embodiments. All other embodiments, based on the embodiments in this solution, which a person of ordinary skill in the art would obtain without inventive faculty, shall fall within the scope of protection of this solution.
The term "comprising" in the description of the present solution and the claims and in the above-mentioned figures, as well as any other variants, means "including but not limited to", intended to cover a non-exclusive inclusion, and not limited to only the examples listed herein. Furthermore, the terms "first" and "second," etc. are used for distinguishing between different objects and not for describing a particular sequential order.
The implementation of the invention is described in detail below with reference to the specific drawings:
fig. 1 is a schematic structural diagram of a first voltage control apparatus 10 according to an embodiment of the present invention.
Referring to fig. 1, the voltage control apparatus 10 may include: the first switch module 110, the second switch module 120, the energy storage module 130, and the control module 140; the first switch module 110 and the second switch module 120 are both controlled by the control module 140;
The first switch module 110 has a first input end for being connected to a first end of the power generation device 20, a second input end for being connected to a second end of the power generation device 20, a first output end connected to a first input end of the second switch module 120, and a second output end connected to a second input end of the second switch module 120;
The second switch module 120, the first output end is used for being connected with the first input end of the electric equipment 30, and the second output end is used for being connected with the second input end of the electric equipment 30;
The energy storage module 130 is connected between the first output terminal of the first switch module 110 and the first input terminal of the second switch module 120, or between the second output terminal of the first switch module 110 and the second input terminal of the second switch module 120;
the control module 140 is configured to:
When the power generation equipment 20 is in a low-voltage state, the first switch module 110 is controlled to be in a conducting state and the second switch module 120 is controlled to be in a boosting working state, so that the power generation equipment 20 boosts and supplies power to the electric equipment 30, and the electric equipment 30 is ensured to work normally;
When the power generation device 20 is in the high-voltage state, the first switch module 110 is controlled to be in the voltage-reducing working state and the second switch module 120 is controlled to be in the conducting state, so that the power generation device 20 reduces voltage and supplies power to the electric equipment 30, and the electric equipment 30 is ensured to work normally.
Alternatively, fig. 1 shows a case where the energy storage module 130 is connected between the first output terminal of the first switch module 110 and the first input terminal of the second switch module 120. The case where the energy storage module 130 is connected between the second output terminal of the first switch module 110 and the second input terminal of the second switch module 120 can be understood with reference to fig. 1, and the following is the same. The energy storage module 130 may be an energy storage inductor.
Alternatively, the power generation device 20 may be an ac power generation device such as a wind turbine generator, or may be a dc power generation device.
Alternatively, the control module 140 may detect whether the voltage of the power generation device 20 is normal through a line, or receive the voltage state of the power generation device 20 by accepting an external communication signal. The power generation device 20 supplies power to the electric equipment 30, and the voltage of the power generation device 20 is in a certain range (namely a normal power supply range), so that the normal operation of the electric equipment 30 can be ensured.
When the power generation device 20 is in the low voltage state, the voltage of the power generation device 20 may be lower than the normal power supply range, the electric equipment 30 may not work normally due to the excessively low voltage, at this time, the control module 140 controls the first switch module 110 to be in the on state, and controls the second switch module 120 to be in the boost working state, so as to boost the voltage of the power generation device 20, and the boost power supply is to boost the voltage of the power generation device 20 to the normal power supply range, so as to ensure the normal work of the electric equipment 30. That is, the first switch module 110 corresponds to a wire, the energy storage module 130 and the second switch module 120 form a boost circuit, so as to boost the voltage of the power generation device 20 and ensure the normal operation of the electric equipment 30.
When the power generation device 20 is in the high-voltage state, the voltage of the power generation device 20 may be higher than the normal power supply range, the electric equipment 30 may not work normally due to the excessively high voltage, at this time, the control module 140 controls the first switch module 110 to be in the voltage-reducing working state, and controls the second switch module 120 to be in the conducting state, so that the voltage of the power generation device 20 is reduced, the voltage of the power generation device 20 is reduced to the normal power supply range by the voltage-reducing power supply, and the normal work of the electric equipment 30 is ensured. That is, the second switch module corresponds to a wire, the first switch module 110 and the energy storage module 130 form a voltage reducing circuit to reduce the voltage of the power generation device 20, so as to ensure the normal operation of the electric equipment 30.
In addition, the first switch module 110 and the second switch module 120 can be controlled according to actual needs, and the voltage control device 10 provided in this disclosure has the following inventive concepts: when the power generation equipment 20 is in a low-voltage state, the voltage control device 10 is a boosting device, so that the power generation equipment 20 can boost power for the electric equipment 30, and the electric equipment 30 can work normally; when the power generation equipment 20 is in a high-voltage state, the voltage control device 10 is a voltage reducing device, so that the power generation equipment 20 can reduce voltage and supply power to the electric equipment 30, and the electric equipment 30 can work normally; when the power generation equipment 20 is in a normal working state, the voltage control device 10 is a wire, so that the power generation equipment 20 can directly supply power to the electric equipment 30, and the electric equipment 30 can work normally.
The present invention provides a voltage control apparatus 10, comprising: the first switch module 110, the second switch module 120, the energy storage module 130, and the control module 140; the first switch module 110 and the second switch module 120 are both controlled by the control module 140; the first switching module 110, the energy storage module 130, and the second switching module 120 are connected in series; an input terminal of the first switch module 110 is used for connecting with the power generation device 20, and an output terminal of the second switch module 120 is used for connecting with the electric equipment 30. The control module 140 controls the first switch module 110 and the second switch module 120, so that the voltage of the power generation equipment 20 can be increased when the power generation equipment 20 is in a low-voltage state, the power generation equipment 20 can be guaranteed to normally supply power to the electric equipment 30, the voltage of the power generation equipment 20 can be reduced when the power generation equipment 20 is in a high-voltage state, the power generation equipment 20 can be guaranteed to normally supply power to the electric equipment 30, reactive power cannot be generated, the influence on the electric equipment 30 is avoided, and the reliability of power supply of the power generation equipment 20 is improved.
Fig. 2 is a schematic structural diagram of a second voltage control apparatus according to an embodiment of the present invention. Fig. 2 shows a case where the energy storage module 130 is connected between the first output terminal of the first switch module 110 and the first input terminal of the second switch module 120. The case where the energy storage module 130 is connected between the second output terminal of the first switch module 110 and the second input terminal of the second switch module 120 can be understood with reference to fig. 2, and the following is the same.
Referring to fig. 2, in some embodiments of the present invention, the first switching module 110 includes a first switching unit 111 and a second switching unit 112; the first switch unit 111 and the second switch unit 112 are controlled by a control module;
A first switching unit 111 having a first end connected to a first input end of the first switching module 110 and a second end connected to a first end of the second switching unit 112 and a first output end of the first switching module 110, respectively; a second end of the second switch unit 112 is connected to a second input end of the first switch module 110 and a second output end of the first switch module 110, respectively;
the control module 140 specifically is configured to:
when the power generation equipment is in a low-voltage state, the first switch unit 111 is controlled to be in an on state, and the second switch unit 112 is controlled to be in an off state;
When the power generation apparatus is in the high voltage state, the first and second switching units 111 and 112 are controlled to put the first switching module 110 in the step-down operation state.
Optionally, when the power generation device 20 is in a low voltage state, the control module controls the first switch unit 111 to be in a conducting state, and controls the second switch unit 112 to be in a disconnecting state, at this time, the first switch module 110 corresponds to a wire, and the energy storage module 130 is combined with the second switch module 120 to boost the voltage of the power generation device 20, so as to ensure that the electric equipment 30 works normally.
When the power generation device 20 is in a high voltage state, the control module 140 controls the first switch unit 111 and the second switch unit 112, for example, controls the first switch unit 111 and the second switch unit 112 to perform high frequency switching according to the change of the voltage waveform of the power generation device 20, and reduces the voltage of the power generation device 20, so as to ensure that the electric equipment 30 works normally.
When the power generation device 20 is in the normal operating state, the control module 140 may control the first switch unit 111 to be in the on state and control the second switch unit 112 to be in the off state.
Fig. 3 is a schematic circuit diagram of a voltage control apparatus according to an embodiment of the present invention. Fig. 3 shows a case where the energy storage module 130 is connected between the first output terminal of the first switch module 110 and the first input terminal of the second switch module 120. The case where the energy storage module 130 is connected between the second output terminal of the first switch module 110 and the second input terminal of the second switch module 120 can be understood with reference to fig. 3, and the following is the same.
Referring to fig. 2 and 3, in some embodiments of the present invention, the first switching unit 111 includes a first switching tube Q1 and a second switching tube Q2; the second switching unit 112 includes a third switching tube Q3 and a fourth switching tube Q4; the first switching tube Q1, the second switching tube Q2, the third switching tube Q3 and the fourth switching tube Q4 are controlled by the control module 140;
a first switching tube Q1 having a first end connected to a first end of the first switching unit 111 and a second end connected to a second end of the second switching tube Q2; a first end of the second switching tube Q2 is connected to a second end of the first switching unit 111;
A third switching tube Q3, a first end of which is connected to the first end of the second switching unit 112, and a second end of which is connected to the second end of the fourth switching tube Q4; the first end of the fourth switching tube Q4 is connected with the second end of the second switching unit 112;
the control module 140 specifically is configured to:
When the power generation equipment is in a low-voltage state, the first switching tube Q1 and the second switching tube Q2 are controlled to be both on, and the third switching tube Q3 and the fourth switching tube Q4 are controlled to be both off;
when the power generation equipment is in a high-voltage state, if the voltage waveform of the power generation equipment is in a positive half-wave, the first switching tube Q1 and the third switching tube Q3 are controlled to be complementary, and the second switching tube Q2 and the fourth switching tube Q4 are controlled to be both conducted; and if the voltage waveform of the power generation equipment is in a negative half wave, controlling the first switching tube Q1 and the third switching tube Q3 to be conducted, and controlling the second switching tube Q2 and the fourth switching tube Q4 to be complementary.
Optionally, the control manner may further include: if the voltage waveform of the power generation device 20 is in a positive half-wave, the first switching tube Q1 and the fourth switching tube Q4 are controlled to be complementary; if the voltage waveform of the power generation device 20 is in the negative half-wave, the second switching tube Q2 and the third switching tube Q3 are controlled to be complementary. The step-down effect may be achieved in the same manner as described above, but may result in current interruption in the energy storage module 130.
Optionally, the voltage waveform of the power generation device includes a positive half wave and a negative half wave during one cycle. The two switching tubes are complementary in that the two switching tubes are not simultaneously turned on and not simultaneously turned off. For example, the first switching transistor Q1 and the third switching transistor Q3 are complementary to each other, that is, when the first switching transistor Q1 is turned on, the third switching transistor Q3 is turned off, and when the first switching transistor Q1 is turned off, the third switching transistor Q3 is turned on, and the first switching transistor Q1 and the third switching transistor Q3 are complementary to each other. The remaining switching tube complementation process is explained above.
Specifically, when the power generation device 20 is in a high voltage state, the control module 140 controls the first switching tube Q1, the second switching tube Q2, the third switching tube Q3 and the fourth switching tube Q4 according to the voltage waveform of the power generation device 20, so that the voltage of the power generation device 20 can be reduced, and the voltage can be reduced to a normal power supply range, so as to ensure the normal operation of the electric equipment 30.
Referring to fig. 3, in some embodiments of the present invention, the first switch module 110 further includes a first capacitance unit 113 connected between a first input terminal of the first switch module 110 and a second input terminal of the first switch module 110.
Alternatively, the first capacitance unit 113 may include at least one capacitance C1, and the capacitance C1 plays a role of energy storage and filtering.
Fig. 4 is a schematic structural diagram of a third voltage control apparatus according to an embodiment of the present invention. Fig. 4 shows a case where the energy storage module 130 is connected between the first output terminal of the first switch module 110 and the first input terminal of the second switch module 120. The case where the energy storage module 130 is connected between the second output terminal of the first switch module 110 and the second input terminal of the second switch module 120 can be understood with reference to fig. 4, and the following is the same.
Referring to fig. 4, in some embodiments of the present invention, the second switching module 120 includes a third switching unit 121 and a fourth switching unit 122; the third switch unit 121 and the fourth switch unit 122 are controlled by the control module 140;
the third switch unit 121, the first end is connected with the first end of the fourth switch unit 122 and the first input end of the second switch module 120 respectively, and the second end is connected with the first output end of the second switch module 120; a second end of the fourth switching unit 122 is connected to a second input end of the second switching module 120 and a second output end of the second switching module 120, respectively;
the control module 140 specifically is configured to:
when the power generation device 20 is in the high-voltage state, the third switch unit 121 is controlled to be in the on state, and the fourth switch unit 122 is controlled to be in the off state;
when the power generation device 20 is in the low voltage state, the third and fourth switching units 121 and 122 are controlled to place the second switching module 120 in the boost operating state.
Optionally, when the power generation device 20 is in a high voltage state, the control module controls 140 the third switch unit 121 to be in a conducting state, and controls the fourth switch unit 122 to be in an off state, at this time, the second switch module 120 corresponds to a wire, and the energy storage module 130 is combined with the first switch module 110 to step down the voltage of the power generation device 20, so as to ensure that the electric equipment 30 works normally.
When the power generation device 20 is in a low voltage state, the control module 140 controls the third switch unit 121 and the fourth switch unit 122, for example, controls the third switch unit 121 and the fourth switch unit 122 to perform high-frequency switching according to the change of the voltage waveform of the power generation device 20, and boosts the voltage of the power generation device 20, so as to ensure that the electric equipment 30 works normally.
When the power generation device 20 is in the normal operating state, the control module 140 may control the third switch unit 121 to be in the on state and control the fourth switch unit 122 to be in the off state.
Referring to fig. 3 and 4, in some embodiments of the present invention, the third switching unit 121 includes a fifth switching tube Q5 and a sixth switching tube Q6; the fourth switching unit 122 includes a seventh switching tube Q7 and an eighth switching tube Q8; the fifth switching tube Q5, the sixth switching tube Q6, the seventh switching tube Q7 and the eighth switching tube Q8 are controlled by the control module 140;
a fifth switching tube Q5 having a first end connected to the first end of the third switching unit 121 and a second end connected to the second end of the sixth switching tube Q6; the first end of the sixth switching tube Q6 is connected to the second end of the third switching unit 121;
A seventh switching tube Q7 having a first end connected to the first end of the fourth switching unit 122 and a second end connected to the second end of the eighth switching tube Q8; the first end of the eighth switching tube Q8 is connected with the second end of the fourth switching unit 122;
the control module 140 specifically is configured to:
When the power generation equipment 20 is in a low-voltage state, if the voltage waveform of the power generation equipment 20 is in a positive half-wave, the fifth switching tube Q5 and the eighth switching tube Q8 are controlled to be conducted, and the sixth switching tube Q6 and the seventh switching tube Q7 are controlled to be complementary; if the voltage waveform of the power generation equipment 20 is in a negative half-wave, the fifth switching tube Q5 and the eighth switching tube Q8 are controlled to be complementary, and the sixth switching tube Q6 and the seventh switching tube Q7 are controlled to be conducted;
when the power generation device 20 is in the high-voltage state, the fifth switching tube Q8 and the sixth switching tube Q6 are both controlled to be on, and the seventh switching tube Q7 and the eighth switching tube Q8 are both controlled to be off.
Optionally, when the power generation device 20 is in the low voltage state, the control module 140 controls the fifth switching tube Q5, the sixth switching tube Q6, the seventh switching tube Q7 and the eighth switching tube Q8 according to the voltage waveform of the power generation device, so that the voltage of the power generation device 20 can be boosted, and the voltage can be raised to the normal power supply range, so as to ensure the normal operation of the electric equipment 30.
The above is the case where the power generation facility 20 is an ac power generation facility.
When the power generation device 20 is a dc power generation device, the first switching unit 111 may include only one switching tube, the second switching unit 112 may include only one switching tube, the third switching unit 121 may include only one switching tube, and the fourth switching unit 122 may include only one switching tube. At this time, the control module 140 may control the four switching tubes to boost and buck according to the voltage waveform of the dc power generation device, specifically may control the on-off of the four switching tubes according to the positive half-wave, and may also achieve the boosting or buck effect, and finally achieve the high-low voltage ride through.
Referring to fig. 3, in some embodiments of the present invention, the second switching module 120 further includes a second capacitance unit 123 connected between the first output terminal of the second switching module 120 and the second output terminal of the second switching module 120.
Alternatively, the second capacitance unit 123 may include at least one capacitance C2, and the capacitance C2 plays a role of energy storage and filtering.
In some embodiments of the present invention, the control module 140 is further configured to:
when the power generation device 20 is in the normal working state, the first switch module 110 and the second switch module 120 are controlled to be in the conducting state, so that the power generation device 20 directly supplies power to the electric equipment 30, and the normal working of the electric equipment 30 is ensured.
Referring to fig. 3, in some embodiments of the present invention, the energy storage module 130 includes at least one energy storage inductance L1.
Alternatively, the energy storage inductor L1 may be the equivalent of a plurality of energy storage inductors in the same place.
Taking fig. 1 and 3 as an example, the following describes the complete working procedure of the voltage control apparatus 10 according to the embodiment of the present invention:
When the power generation device 20 is in a normal working state, the control module 140 controls the first switching tube Q1, the second switching tube Q2, the fifth switching tube Q5 and the sixth switching tube Q6 to be all on, and controls the third switching tube Q3, the fourth switching tube Q4, the seventh switching tube Q7 and the eighth switching tube Q8 to be all off, at this time, the power generation device 20 directly supplies power to the electric equipment normally, and the electric equipment 30 works normally.
When the power generation device 20 is in a low-voltage state, the control module 140 controls the first switching tube Q1 and the second switching tube Q2 to be turned on, controls the third switching tube Q3 and the fourth switching tube Q4 to be turned off, and controls the fifth switching tube Q5, the sixth switching tube Q6, the seventh switching tube Q7 and the eighth switching tube Q8 in the second switching module 120 to perform high-frequency switching according to the voltage waveform of the power generation device 20, and at this time, the second switching module 120 and the energy storage module 130 form a boost circuit to boost the power for the power generation device 20 to the electric equipment 30, so as to ensure normal operation of the electric equipment 30.
Specifically, the boost control process is:
if the voltage waveform of the power generation equipment 20 is in a positive half-wave state, the fifth switching tube Q5 and the eighth switching tube Q8 are controlled to be conducted, and the sixth switching tube Q6 and the seventh switching tube Q7 are controlled to be complementary; and if the voltage period of the power generation equipment is in a negative half wave, the fifth switching tube Q5 and the eighth switching tube Q8 are controlled to be complementary, and the sixth switching tube Q6 and the seventh switching tube Q7 are controlled to be conducted.
When the power generation device 20 is in a high-voltage state, the control module 140 controls the fifth switching tube Q5 and the sixth switching tube Q6 to be turned on, controls the seventh switching tube Q7 and the eighth switching tube Q8 to be turned off, and controls the first switching tube Q1, the second switching tube Q2, the third switching tube Q3 and the fourth switching tube Q4 in the first switching module 110 to perform high-frequency switching according to the voltage waveform of the power generation device, at this time, the first switching module 110 and the energy storage module 130 form a voltage reducing circuit to reduce the voltage of the power generation device 20 to the electric equipment 30 for supplying power, so as to ensure the normal operation of the electric equipment 30.
Specifically, the step-down control process is as follows:
If the voltage waveform of the power generation equipment 20 is in a positive half-wave state, the first switching tube Q1 and the third switching tube Q3 are controlled to be complementary, and the second switching tube Q2 and the fourth switching tube Q4 are controlled to be conducted; if the voltage waveform of the power generation device 20 is in the negative half-wave, the first switching tube Q1 and the third switching tube Q3 are controlled to be both on, and the second switching tube Q2 and the fourth switching tube Q4 are controlled to be complementary.
The voltage control device 10 of the embodiment of the invention comprises a control module 140, a first switch module 110 and an energy storage module 130 to form a voltage reduction circuit, and the control module 140, a second switch module 120 and the energy storage module 130 to form a voltage boosting circuit, so that normal power supply of the power generation equipment 20 to the electric equipment 30 in a high-low voltage crossing state is ensured, and the reliability of power supply of the power generation equipment 20 is ensured. In addition, the common energy storage module 130 can reduce cost and save space while ensuring effect.
The embodiment of the invention also provides a switching power supply, which comprises the voltage control device 10 of any embodiment.
The above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (9)
1. A voltage control apparatus, comprising: the energy storage device comprises a first switch module, a second switch module, an energy storage module and a control module; the first switch module and the second switch module are controlled by the control module;
The first switch module is used for being connected with a first end of the power generation equipment, the second input end is used for being connected with a second end of the power generation equipment, the first output end is connected with the first input end of the second switch module, and the second output end is connected with the second input end of the second switch module;
the first output end of the second switch module is used for being connected with the first input end of the electric equipment, and the second output end of the second switch module is used for being connected with the second input end of the electric equipment;
The energy storage module is connected between the first output end of the first switch module and the first input end of the second switch module, or between the second output end of the first switch module and the second input end of the second switch module;
the control module is used for:
When the power generation equipment is in a low-voltage state, the first switch module is controlled to be in a conducting state and the second switch module is controlled to be in a boosting working state, so that the power generation equipment boosts and supplies power to the electric equipment, and the electric equipment is ensured to work normally;
when the power generation equipment is in a high-voltage state, the first switch module is controlled to be in a voltage-reducing working state and the second switch module is controlled to be in a conducting state, so that the power generation equipment reduces voltage and supplies power to the electric equipment, and the electric equipment is ensured to work normally;
The control module is further configured to:
When the power generation equipment is in a normal working state, the first switch module and the second switch module are controlled to be in a conducting state, so that the power generation equipment directly supplies power to the electric equipment, and the electric equipment is ensured to work normally.
2. The voltage control device of claim 1, wherein the first switching module comprises a first switching unit and a second switching unit; the first switch unit and the second switch unit are controlled by the control module;
the first end of the first switch unit is connected with the first input end of the first switch module, and the second end of the first switch unit is connected with the first end of the second switch unit and the first output end of the first switch module respectively; the second end of the second switch unit is respectively connected with the second input end of the first switch module and the second output end of the first switch module;
the control module is specifically used for:
When the power generation equipment is in a low-voltage state, the first switch unit is controlled to be in a conducting state, and the second switch unit is controlled to be in a disconnecting state;
When the power generation equipment is in a high-voltage state, the first switch unit and the second switch unit are controlled so that the first switch module is in a voltage-reducing working state.
3. The voltage control apparatus of claim 2, wherein the first switching unit includes a first switching tube and a second switching tube; the second switching unit comprises a third switching tube and a fourth switching tube; the first switching tube, the second switching tube, the third switching tube and the fourth switching tube are controlled by the control module;
the first end of the first switch tube is connected with the first end of the first switch unit, and the second end of the first switch tube is connected with the second end of the second switch tube; the first end of the second switching tube is connected with the second end of the first switching unit;
the first end of the third switching tube is connected with the first end of the second switching unit, and the second end of the third switching tube is connected with the second end of the fourth switching tube; the first end of the fourth switching tube is connected with the second end of the second switching unit;
The control module is specifically configured to:
When the power generation equipment is in a low-voltage state, the first switching tube and the second switching tube are controlled to be both on, and the third switching tube and the fourth switching tube are controlled to be both off;
when the power generation equipment is in a high-voltage state, if the voltage waveform of the power generation equipment is in a positive half-wave, the first switching tube and the third switching tube are controlled to be complementary, and the second switching tube and the fourth switching tube are controlled to be both conducted; and if the voltage waveform of the power generation equipment is in a negative half wave, controlling the first switching tube and the third switching tube to be conducted, and controlling the second switching tube and the fourth switching tube to be complementary.
4. The voltage control device of claim 2, wherein the first switch module further comprises a first capacitive element connected between a first input of the first switch module and a second input of the first switch module.
5. The voltage control apparatus of claim 1, wherein the second switching module comprises a third switching unit and a fourth switching unit; the third switch unit and the fourth switch unit are controlled by the control module;
The first end of the third switch unit is connected with the first end of the fourth switch unit and the first input end of the second switch module respectively, and the second end of the third switch unit is connected with the first output end of the second switch module; the second end of the fourth switch unit is respectively connected with the first input end of the second switch module and the second output end of the second switch module;
the control module is specifically used for:
when the power generation equipment is in a high-voltage state, the third switch unit is controlled to be in a conducting state, and the fourth switch unit is controlled to be in a disconnecting state;
and when the power generation equipment is in a low-voltage state, controlling the third switch unit and the fourth switch unit to enable the second switch module to be in a boosting working state.
6. The voltage control apparatus of claim 5, wherein the third switching unit includes a fifth switching tube and a sixth switching tube; the fourth switching unit comprises a seventh switching tube and an eighth switching tube; the fifth switching tube, the sixth switching tube, the seventh switching tube and the eighth switching tube are controlled by the control module;
The first end of the fifth switching tube is connected with the first end of the third switching unit, and the second end of the fifth switching tube is connected with the second end of the sixth switching tube; the first end of the sixth switching tube is connected with the second end of the third switching unit;
The first end of the seventh switching tube is connected with the first end of the fourth switching unit, and the second end of the seventh switching tube is connected with the second end of the eighth switching tube; the first end of the eighth switching tube is connected with the second end of the fourth switching unit;
the control module is specifically used for:
When the power generation equipment is in a low-voltage state, if the power generation equipment is in a positive half-wave in a voltage period, controlling the fifth switching tube and the eighth switching tube to be conducted, and controlling the sixth switching tube and the seventh switching tube to be complementary; if the voltage waveform of the power generation equipment is in a negative half wave, controlling the fifth switching tube and the eighth switching tube to be complementary, and controlling the sixth switching tube and the seventh switching tube to be both conducted;
When the power generation equipment is in a high-voltage state, the fifth switching tube and the sixth switching tube are controlled to be both on, and the seventh switching tube and the eighth switching tube are controlled to be both off.
7. The voltage control device of claim 5, wherein the second switch module further comprises a second capacitive element connected between a first output of the second switch module and a second output of the second switch module.
8. The voltage control device of claim 1, wherein the energy storage module comprises at least one energy storage inductor.
9. A switching power supply comprising a voltage control apparatus as claimed in any one of claims 1 to 8.
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| CN202111162676.7A CN114050606B (en) | 2021-09-30 | 2021-09-30 | Voltage control device and switching power supply |
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| CN202111162676.7A CN114050606B (en) | 2021-09-30 | 2021-09-30 | Voltage control device and switching power supply |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104682699A (en) * | 2015-03-20 | 2015-06-03 | 深圳市华星光电技术有限公司 | Boost-buck conversion circuit, power management module and liquid crystal driving device |
| CN112994459A (en) * | 2021-04-26 | 2021-06-18 | 西安拓尔微电子有限责任公司 | Power supply circuit and control method thereof |
| CN113364284A (en) * | 2021-06-21 | 2021-09-07 | 珠海格力电器股份有限公司 | Voltage boosting and reducing circuit, control method and electric equipment |
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2021
- 2021-09-30 CN CN202111162676.7A patent/CN114050606B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104682699A (en) * | 2015-03-20 | 2015-06-03 | 深圳市华星光电技术有限公司 | Boost-buck conversion circuit, power management module and liquid crystal driving device |
| CN112994459A (en) * | 2021-04-26 | 2021-06-18 | 西安拓尔微电子有限责任公司 | Power supply circuit and control method thereof |
| CN113364284A (en) * | 2021-06-21 | 2021-09-07 | 珠海格力电器股份有限公司 | Voltage boosting and reducing circuit, control method and electric equipment |
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