CN215498336U - Energy storage circuit - Google Patents
Energy storage circuit Download PDFInfo
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- CN215498336U CN215498336U CN202121518753.3U CN202121518753U CN215498336U CN 215498336 U CN215498336 U CN 215498336U CN 202121518753 U CN202121518753 U CN 202121518753U CN 215498336 U CN215498336 U CN 215498336U
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Abstract
The embodiment of the utility model relates to the technical field of energy storage, in particular to an energy storage circuit. The embodiment of the utility model provides an energy storage circuit, which comprises an energy storage battery, a charging and discharging circuit, a bridge circuit, a change-over switch circuit and a control unit, wherein the charging and discharging circuit is connected with the bridge circuit; energy storage battery, charge and discharge circuit, bridge circuit, change over switch circuit connects gradually, the control unit connects bridge circuit, change over switch circuit still is used for connecting energy conversion component, commercial power and load, select different operating condition through change over switch circuit, the control unit exports control signal to bridge circuit according to operating condition, make bridge circuit act as direct current conversion circuit under energy conversion component charges, act as rectifier circuit under commercial power charges, act as inverter circuit under power supply output, make energy storage battery can with energy conversion component, commercial power and load adaptation use, and share bridge circuit under three kinds of states, it is strong and with low costs to see this energy storage circuit suitability.
Description
Technical Field
The embodiment of the utility model relates to the technical field of energy storage, in particular to an energy storage circuit.
Background
The energy storage power supply is a power supply which converts electric energy into chemical energy to be stored in a battery and releases the energy stored in the battery when needed; the electric energy stored in the battery can be generated by solar power generation, a generator, commercial power and the like, and the more the electric energy sources are, the stronger the applicability of the energy storage power supply is; the more power sources, the more corresponding conversion circuits, resulting in increased manufacturing costs of the product.
The energy sources stored by the battery of the existing energy storage power supply are mainly solar power generation and commercial power. The first type of the general energy storage circuits is as shown in fig. 1, the energy storage battery is respectively connected with a mains supply and a load through a full bridge circuit and a switch circuit, and therefore, in the mode of the energy storage circuit, although the circuit cost is low, the energy source of the energy storage battery is only the mains supply and cannot be adapted to a photovoltaic panel, and the applicability is poor; the second is that as shown in fig. 2, the energy storage battery is connected to the photovoltaic panel through a half-bridge circuit, and is connected to the commercial power and the load through a full-bridge circuit, although the energy source of the energy storage battery includes the commercial power and the solar energy, the applicability is strong, but the circuit cost is relatively high.
SUMMERY OF THE UTILITY MODEL
The embodiment of the utility model provides an energy storage circuit which is strong in applicability and low in cost.
The embodiment of the utility model adopts a technical scheme that: provided is a tank circuit including: the energy storage battery, the charging and discharging circuit, the bridge circuit, the change-over switch circuit and the control unit;
the first end of the charge-discharge circuit is connected with the energy storage battery, and the charge-discharge circuit is used for providing a charge-discharge loop for the energy storage battery;
the first end of the bridge circuit is connected with the second end of the charge and discharge circuit, the second end of the bridge circuit is connected with the first end of the change-over switch circuit, and the third end of the bridge circuit is connected with the control unit;
the second end of the change-over switch circuit is used for connecting an energy conversion element, the third end of the change-over switch circuit is used for connecting a commercial power, the fourth end of the change-over switch circuit is used for connecting a load, and the change-over switch circuit is used for controlling the on-off state of the bridge circuit and the energy conversion element, controlling the on-off state of the bridge circuit and the commercial power and controlling the on-off state of the bridge circuit and the load;
when the bridge circuit is communicated with the energy conversion element, the control unit is used for outputting a first control signal to the bridge circuit, and the bridge circuit is used for converting a first direct current of the energy conversion element into a second direct current according to the first control signal and outputting the second direct current to the charging and discharging circuit so as to charge the energy storage battery; when the bridge circuit is communicated with the mains supply, the control unit is used for outputting a second control signal to the bridge circuit, and the bridge circuit is used for converting the first alternating current of the mains supply into a third direct current according to the second control signal and outputting the third direct current to the charging and discharging loop so as to charge the energy storage battery; when the bridge circuit is communicated with the load, the control unit is used for outputting a third control signal to the bridge circuit, and the bridge circuit is used for converting a fourth direct current of the charge-discharge loop into a second alternating current according to the third control signal and outputting the second alternating current to the load so that the energy storage battery supplies power to the load.
In some embodiments, the bridge circuit includes a first switching tube, a second switching tube, a third switching tube and a fourth switching tube;
the first end of the first switch tube is respectively connected with the second end of the charge-discharge circuit and the first end of the second switch tube, the second end of the first switching tube is connected with the first end of the third switching tube, the second end of the second switching tube is connected with the first end of the fourth switching tube, the second end of the third switching tube is respectively connected with the third end of the charge-discharge circuit and the second end of the fourth switching tube, the third end of the first switch tube, the third end of the second switch tube, the third end of the third switch tube and the third end of the fourth switch tube are all connected with the control unit, the connection point of the second end of the first switching tube and the first end of the third switching tube is a first common point, and the connection point of the second end of the second switch tube and the first end of the fourth switch tube is a second common point, and the first common point and the second common point are both connected with the change-over switch circuit.
In some embodiments, the switching circuit includes a first switching circuit, a second switching circuit, and a third switching circuit;
the first end of the first switch circuit is connected with the first common point, the second end of the first switch circuit is connected with the second common point, the third end and the fourth end of the first switch circuit are used for connecting the energy conversion element, and the first switch circuit is used for switching on or off the connection between the bridge circuit and the energy conversion element;
the first end of the second switch circuit is connected with the first common point, the second end of the second switch circuit is connected with the second common point, the third end and the fourth end of the second switch circuit are used for connecting the commercial power, and the second switch circuit is used for switching on or off the connection between the bridge circuit and the commercial power;
the first end of the third switch circuit is connected with the first common point, the second end of the third switch circuit is connected with the second common point, the third end and the fourth end of the third switch circuit are used for connecting the load, and the third switch circuit is used for switching on or off the connection between the bridge circuit and the load.
In some embodiments, the first switching circuit comprises a first switch and a second switch;
the first switch is connected in series between the first common point and the first end of the energy conversion element, and the second switch is connected in series between the second common point and the second end of the energy conversion element.
In some embodiments, the second switching circuit comprises a third switch and a fourth switch;
the third change-over switch is connected between the first common point and the first end of the commercial power in series, and the fourth change-over switch is connected between the second common point and the second end of the commercial power in series.
In some embodiments, the third switching circuit comprises a fifth switch and a sixth switch;
the fifth change-over switch is connected in series between the first common point and the first end of the load, and the sixth change-over switch is connected in series between the second common point and the second end of the load.
In some embodiments, the tank circuit further comprises a seventh diverter switch and an eighth diverter switch;
the seventh change-over switch is connected in series between the first end of the commercial power and the first end of the load, and the eighth change-over switch is connected in series between the second end of the commercial power and the second end of the load.
In some embodiments, the tank circuit further comprises a filter circuit;
the first end of the filter circuit is connected with the first common point, the second end of the filter circuit is connected with the second common point, the third end of the filter circuit is respectively connected with the first end of the first switch circuit, the first end of the second switch circuit and the first end of the third switch circuit, and the fourth end of the filter circuit is respectively connected with the second end of the first switch circuit, the second end of the second switch circuit and the second end of the third switch circuit.
In some embodiments, the filter circuit comprises an inductor and a filter capacitor;
the first end of the inductor is connected to the first common point, the second end of the inductor is connected to the first end of the filter capacitor, the first end of the first switch circuit, the first end of the second switch circuit and the first end of the third switch circuit, respectively, and the second end of the filter capacitor is connected to the second common point, the second end of the first switch circuit, the second end of the second switch circuit and the second end of the third switch circuit, respectively.
In some embodiments, the tank circuit further comprises a bus capacitor;
one end of the bus capacitor is connected with the second end of the charge and discharge circuit, and the other end of the bus capacitor is connected with the third end of the charge and discharge circuit.
The beneficial effects of the embodiment of the utility model are as follows: different from the situation of the prior art, an embodiment of the present invention provides an energy storage circuit, which includes an energy storage battery, a charging/discharging circuit, a bridge circuit, a switch circuit, and a control unit; energy storage battery, charge and discharge circuit, bridge circuit, change over switch circuit connects gradually, the control unit connects bridge circuit, change over switch circuit still is used for connecting energy conversion component, commercial power and load, select different operating condition through change over switch circuit, the control unit exports control signal to bridge circuit according to operating condition, make bridge circuit act as direct current conversion circuit under energy conversion component charges, act as rectifier circuit under commercial power charges, act as inverter circuit under power supply output, thereby make energy storage battery can with energy conversion component, commercial power and load adaptation use, and share bridge circuit under three kinds of states, it is not only strong and with low costs to see this energy storage circuit suitability.
Drawings
One or more embodiments are illustrated by the accompanying figures in the drawings that correspond thereto and are not to be construed as limiting the embodiments, wherein elements/modules and steps having the same reference numerals are represented by like elements/modules and steps, unless otherwise specified, and the drawings are not to scale.
Fig. 1 is a schematic diagram of a tank circuit provided in the prior art;
FIG. 2 is a schematic diagram of another prior art tank circuit configuration;
fig. 3 is a schematic structural block diagram of a tank circuit according to an embodiment of the present invention;
fig. 4 is a schematic circuit diagram of a tank circuit according to an embodiment of the present invention;
FIG. 5 is a block diagram of another tank circuit according to an embodiment of the present invention;
FIG. 6 is a block diagram illustrating a structure of another tank circuit according to an embodiment of the present invention;
FIG. 7 is a first equivalent circuit diagram of FIG. 4;
FIG. 8 is a second equivalent circuit diagram of FIG. 4;
fig. 9 is a third equivalent circuit diagram of fig. 4.
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the utility model, but are not intended to limit the utility model in any way. It should be noted that variations and modifications can be made by persons skilled in the art without departing from the spirit of the utility model. All falling within the scope of the present invention.
In order to facilitate an understanding of the present application, the present application is described in more detail below with reference to the accompanying drawings and specific embodiments. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
It should be noted that, if not conflicted, the various features of the embodiments of the utility model may be combined with each other within the scope of protection of the present application. In addition, although the functional blocks are divided in the device diagram, in some cases, the blocks may be divided differently from those in the device. Further, the terms "first," "second," and the like, as used herein, do not limit the data and the execution order, but merely distinguish the same items or similar items having substantially the same functions and actions.
Referring to fig. 3, an energy storage circuit 100 according to an embodiment of the present invention includes: the energy storage battery comprises an energy storage battery 10, a charging and discharging circuit 20, a bridge circuit 30, a change-over switch circuit 40 and a control unit 50. The energy storage battery 10 may be a plurality of series-connected batteries, a plurality of parallel-connected batteries, or a plurality of series-parallel combined batteries, and is configured to store electric energy of the energy conversion element, store electric energy of a commercial power, or provide electric energy for a load. The first end of the charge and discharge circuit 20 is connected to the energy storage battery 10, and the charge and discharge circuit 20 is used for providing a charge and discharge loop for the energy storage battery 10. The first terminal of the bridge circuit 30 is connected to the second terminal of the charge and discharge circuit 20, the second terminal of the bridge circuit 30 is connected to the first terminal of the switch circuit 40, and the third terminal of the bridge circuit 30 is connected to the control unit 50. The second terminal of the switch circuit 40 is used for connecting the energy conversion element 200, the third terminal of the switch circuit 40 is used for connecting the commercial power 220, the fourth terminal of the switch circuit 40 is used for connecting the load 230, and the switch circuit 40 is used for controlling the on-off states of the bridge circuit 30 and the energy conversion element 200, controlling the on-off states of the bridge circuit 30 and the commercial power 220, and controlling the on-off states of the bridge circuit 30 and the load 230. When the bridge circuit 30 is connected to the energy conversion element 200, the control unit 50 is configured to output a first control signal to the bridge circuit 30, and the bridge circuit 30 is configured to convert the first direct current of the energy conversion element 200 into a second direct current according to the first control signal and output the second direct current to the charging and discharging circuit 20; when the bridge circuit 30 is connected to the utility power 220, the control unit 50 is configured to output a second control signal to the bridge circuit 30, and the bridge circuit 30 is configured to convert the first ac power of the utility power 220 into a third dc power according to the second control signal and output the third dc power to the charging and discharging circuit 20; when the bridge circuit 30 is connected to the load 230, the control unit 50 is configured to output a third control signal to the bridge circuit 30, and the bridge circuit 30 is configured to convert the fourth dc power of the charging and discharging circuit 20 into the second ac power according to the third control signal and output the second ac power to the load 230.
In the energy storage circuit 100, the working state of the energy storage battery includes commercial power charging, energy conversion element charging, and power supply output, and the current working state of the energy storage circuit is selected by switching the switch circuit 40. For example, when the switch circuit 40 selects the bridge circuit 30 to communicate with the energy conversion element 200, the energy storage battery 10 is in the charging state of the energy conversion element, the control unit 50 outputs a first control signal to the bridge circuit 30, and at this time, the bridge circuit 30 can convert the first direct current of the energy conversion element 200 into a second direct current to charge the energy storage battery 10; when the switch circuit 40 selects the bridge circuit 30 to communicate with the commercial power 220, the energy storage battery 10 is in the commercial power charging state, the control unit 50 outputs a second control signal to the bridge circuit 30, and at this time, the bridge circuit 30 can convert the first alternating current of the commercial power 220 into a third direct current for charging the energy storage battery 10; when the switch circuit 40 selects the bridge circuit 30 to communicate with the load 230, the energy storage battery 10 is in a power supply output state, and the control unit 50 outputs a third control signal to the bridge circuit 30, at this time, the bridge circuit 30 can convert the fourth direct current of the energy storage battery 10 into the second alternating current for the load 230 to use. In the energy storage circuit 100, different working states of the energy storage battery 10 are selected by switching the switch circuit 40, and the control unit 50 outputs a control signal to the bridge circuit 30 according to the determined working state, so that the bridge circuit 30 serves as a direct current conversion circuit in a charging state of the energy conversion element, a rectification circuit in a charging state of a mains supply, and an inverter circuit in a power supply output state, so that the energy storage battery 10 can be adapted to the energy conversion element 200, the mains supply 220 and the load 230, and the applicability of the energy storage circuit 100 is strong; in addition, in three working states, the bridge circuit 30 is shared, and the bridge circuit 30 can serve as different circuit structures only by being controlled by the control unit 50, so that the cost of the energy storage circuit is low.
In practical applications, the energy conversion element can be a photovoltaic panel, a fan or any other suitable green energy power generation device, the photovoltaic panel is taken as the energy conversion element in the following explanation to explain the utility model in detail, and the practical use is not limited.
In some embodiments, referring to fig. 4, the bridge circuit 30 includes a first switch Q1, a second switch Q2, a third switch Q3, and a fourth switch Q4; a first end of the first switch tube Q1 is connected to the second end of the charge and discharge circuit 20 and the first end of the second switch tube Q2, respectively, a second end of the first switch tube Q1 is connected to the first end of the third switch tube Q3, a second end of the second switch tube Q2 is connected to the first end of the fourth switch tube Q4, a second end of the third switch tube Q3 is connected to the third end of the charge and discharge circuit 20 and the second end of the fourth switch tube Q4, a third end of the first switch tube Q1, and a third end of the second switch tube Q2, the third end of the third switch tube Q3 and the third end of the fourth switch tube Q4 are both connected with the control unit, the connection point of the second end of the first switch tube Q1 and the first end of the third switch tube Q3 is a first common point A1, the connection point of the second end of the second switch tube Q2 and the first end of the fourth switch tube Q4 is a second common point A2, and the first common point A1 and the second common point A2 are both connected with the switch circuit.
When the bridge circuit 30 is in communication with the photovoltaic panel 210, the control unit 50 is configured to output a first control signal to the second switching transistor Q2 to make the second switching transistor Q2 disconnect the first end of the second switching transistor Q2 and the second end of the second switching transistor Q2, and output a first control signal to the fourth switching transistor Q4 to make the fourth switching transistor Q4 connect the first end of the fourth switching transistor Q4 and the second end of the fourth switching transistor Q4. When the bridge circuit 30 is connected to the utility power 220, the control unit 50 is configured to output a second control signal to the four switching tubes, so that the bridge circuit serves as a rectifying circuit, and the first ac power of the utility power 220 is converted into a third dc power for charging the energy storage battery 10. Similarly, when the bridge circuit 20 is connected to the load 230, the control unit 50 is configured to output a third control signal to the four switching tubes, so that the four switching tubes serve as an inverter circuit, and the fourth direct current of the energy storage battery 10 is converted into a second alternating current for the load 230. For specific control of the four switching tubes in the bridge circuit, reference may be made to a control method in the prior art, which is not limited herein.
In some embodiments, referring to fig. 4, the switch circuit includes a first switch circuit 41, a second switch circuit 42, and a third switch circuit 43. The first terminal of the first switch circuit 41 is connected to the first common point a1, the second terminal of the first switch circuit 41 is connected to the second common point a2, the third terminal and the fourth terminal of the first switch circuit 41 are used for connecting the photovoltaic panel 210, and the first switch circuit 41 is used for connecting or disconnecting the bridge circuit 30 and the photovoltaic panel 210. A first terminal of the second switch circuit 42 is connected to the first common point a1, a second terminal of the second switch circuit 42 is connected to the second common point a2, a third terminal and a fourth terminal of the second switch circuit 42 are used for connecting the utility power 220, and the second switch circuit 42 is used for turning on or off the connection between the bridge circuit 30 and the utility power 220; a first terminal of the third switch circuit 43 is connected to the first common point a1, a second terminal of the third switch circuit 43 is connected to the second common point a2, a third terminal and a fourth terminal of the third switch circuit 43 are used for connecting the load 230, and the third switch circuit 43 is used for turning on or off the connection of the bridge circuit 30 and the load 230.
In some embodiments, referring to fig. 4, the first switch circuit 41 includes a first switch S1 and a second switch S2. The first switch S1 is connected in series between the first common point a1 and the first end of the photovoltaic panel 210, and the second switch S2 is connected in series between the second common point a2 and the second end of the photovoltaic panel 210.
In some embodiments, referring again to fig. 4, the second switch circuit 42 includes a third switch S3 and a fourth switch S4. The third switch S3 is connected in series between the first common point a1 and the first terminal of the utility power 220, and the fourth switch S4 is connected in series between the second common point a2 and the second terminal of the utility power 220.
In some embodiments, please continue to refer to fig. 4, the third switch circuit 43 includes a fifth switch S5 and a sixth switch S6. The fifth switch S5 is connected in series between the first common point a1 and the first terminal of the load 230, and the sixth switch S6 is connected in series between the second common point a2 and the second terminal of the load 230.
Referring to fig. 4, in some embodiments, the energy storage circuit further includes a seventh switch S7 and an eighth switch S8, in order to facilitate the commercial power to directly supply power to the load when the energy storage battery is low. The seventh switch S7 is connected in series between the first end of the utility power 220 and the first end of the load 230, and the eighth switch S8 is connected in series between the second end of the utility power 220 and the second end of the load 230.
In order to filter noise in the current, in some embodiments, referring to fig. 5, the tank circuit 100 further includes a filter circuit 60. The filter circuit 60 is connected in series between the second end of the bridge circuit 30 and the first end of the switch circuit 40. Specifically, referring to fig. 6, a first terminal of the filter circuit is connected to the first common point a1, a second terminal of the filter circuit is connected to the second common point a2, a third terminal of the filter circuit is connected to the first terminal of the first switch circuit 41, the first terminal of the second switch circuit 42, and the first terminal of the third switch circuit 43, respectively, and a fourth terminal of the filter circuit 60 is connected to the second terminal of the first switch circuit 41, the second terminal of the second switch circuit 42, and the second terminal of the third switch circuit 43, respectively.
In some embodiments, referring to fig. 4, the filter circuit 60 includes an inductor L and a filter capacitor C1. The first end of the inductor L is connected to the first common point a1, the second end of the inductor L is connected to the first end of the filter capacitor C1, the first end of the first switch circuit 41, the first end of the second switch circuit 42, and the first end of the third switch circuit 43, respectively, and the second end of the filter capacitor C1 is connected to the second common point a2, the second end of the first switch circuit 41, the second end of the second switch circuit 42, and the second end of the third switch circuit 43, respectively. Specifically, the first end of the filter capacitor C1 is connected to the first switch S1, the third switch S3 and the fifth switch S5, the first end of the filter capacitor C1 is connected to the second switch S2, the fourth switch S4 and the sixth switch S6, respectively, and by providing the inductor L and the filter capacitor C1, the voltage can be more stable, in practical application, the filter capacitor C1 is a non-polar capacitor and can be formed by a plurality of capacitor sets, and the filter circuit 60 can also adopt any other filter circuit structure, which is not limited herein.
In some embodiments, referring to fig. 4, the energy storage circuit further includes a bus capacitor C2. One end of the bus capacitor C2 is connected to the second end of the charge/discharge circuit 20, and the other end of the bus capacitor C2 is connected to the third end of the charge/discharge circuit 20. The bus capacitor C2 may be an electrolytic capacitor or a film capacitor, and is not limited herein.
The working process of the embodiment of the utility model is explained in detail below with reference to the embodiment shown in fig. 4: the first switch S1, the second switch S2, the third switch S3, the fourth switch S4, the fifth switch S5, the sixth switch S6, the seventh switch S7, and the eighth switch S8 may be relays, contactors, air switches, or manual switches, but are not limited thereto. Specifically, the first switch tube Q1 is a first NMOS tube, the second switch tube Q2 is a second NMOS tube, the third switch tube Q3 is a third NMOS tube, and the fourth switch tube Q4 is a fourth NMOS tube, wherein, referring to fig. 5, the drain of the first NMOS tube Q1 is connected to the second end of the charge and discharge circuit 20 and the drain of the second NMOS tube Q2, the source of the first NMOS tube Q1 is connected to the first end of the filter circuit 60 and the drain of the third NMOS tube Q3, the source of the second NMOS tube Q2 is connected to the drain of the fourth NMOS tube Q4 and the second end of the filter circuit 60, the source of the third NMOS tube Q3 is connected to the third end of the charge and discharge circuit 20 and the source of the fourth NMOS tube Q4, and the gate of the first NMOS tube Q1, the gate of the second NMOS tube Q2, the gate of the third NMOS tube Q3, and the gate of the fourth NMOS tube Q4 are connected to the control unit 50. Besides the NMOS transistor, in practical applications, the switch transistor may also be an igbt transistor, a PMOS transistor, or any other suitable switch device, which is not limited herein.
Specifically, when the energy storage cell 10 is in the photovoltaic panel charging state, that is, the first switch S1 and the second switch S2 are both turned on, the third switch S3, the fourth switch S4, the fifth switch S5, the sixth switch S6, the seventh switch S7, and the eighth switch S8 are all turned off, and the control unit 50 outputs a low level to the second NMOS transistor Q2 and outputs a high level to the fourth NMOS transistor Q4, then the second NMOS transistor Q2 is turned off, and the fourth NMOS transistor Q4 is turned on. At this time, the energy storage circuit 10 is equivalent to the circuit shown in fig. 7, and with reference to fig. 4 and 7, after passing through the inductor L, the charging current of the photovoltaic panel 210 flows to the charging and discharging circuit 20 through the body diode of the first NMOS transistor Q1, the charging and discharging circuit 20 charges the energy storage battery 10, then flows to the fourth NMOS transistor Q4 through the charging and discharging circuit 20, and finally flows back to the photovoltaic panel 210 through the fourth NMOS transistor Q4, so that the photovoltaic panel 210 charges the energy storage battery 10. The control unit 50 may then output a high level to the first NMOS transistor Q1 to turn on the first NMOS transistor Q1, or in practical applications, the first NMOS transistor Q1 may be turned off, and the body diode of the first NMOS transistor Q1 may be used to work, and in addition, the third NMOS transistor Q3 may be used as a high-frequency switch to adjust the magnitude of the charging current.
When the energy storage battery 10 is in the commercial power charging state, that is, the third switch S3 and the fourth switch S4 are both closed, the first switch S1, the second switch S2, the fifth switch S5, the sixth switch S6, the seventh switch S7, and the eighth switch S8 are all open. At this time, the energy storage circuit is equivalent to that shown in fig. 8, and the control unit 50 outputs a second control signal to the bridge circuit 30, so that the four NMOS transistors serve as a rectifying circuit, and the first ac power of the utility power 220 can be converted into a third dc power for charging the energy storage battery 10. As for the driving method for the four NMOS transistors, the driving method in the prior art can be referred to, and is not limited herein.
When the energy storage battery 10 supplies power to the load, that is, the fifth switch S5 and the sixth switch S6 are both turned on, and the first switch S1, the second switch S2, the third switch S3, the fourth switch S4, the seventh switch S7, and the eighth switch S8 are all turned off, at this time, the energy storage circuit is equivalent to that shown in fig. 9, the control unit 50 outputs a third control signal to the bridge circuit 30, so that the four NMOS transistors serve as an inverter circuit, and the fourth direct current of the energy storage battery 10 can be converted into the second alternating current for the load 230 to use. In addition, when the energy storage battery 10 is short of power, the fifth switch S5 and the sixth switch S6 may be opened, and the seventh switch S7 and the eighth switch S8 may be closed, so that the commercial power 220 directly supplies power to the load 230.
To sum up, in the energy storage circuit 100, different working states of the energy storage battery 10 are selected by the switch, and the control unit 50 outputs a control signal to the four switching tubes according to the determined working state, so that the four switching tubes serve as a direct current conversion circuit in the charging state of the photovoltaic panel, a rectification circuit in the charging state of the commercial power, and an inverter circuit in the power supply output state, so that the energy storage battery 10 can be adapted to the photovoltaic panel 210, the commercial power 220, and the load 230, and the applicability of the energy storage circuit 100 is strong; in addition, under three working states, four switching tubes are shared, and the four switching tubes can serve as different circuit structures only by being controlled by the control unit 50, so that the cost of the energy storage circuit is low.
The embodiment of the utility model provides an energy storage circuit, which comprises an energy storage battery, a charging and discharging circuit, a bridge circuit, a change-over switch circuit and a control unit, wherein the charging and discharging circuit is connected with the bridge circuit; energy storage battery, charge and discharge circuit, bridge circuit, change over switch circuit connects gradually, the control unit connects bridge circuit, change over switch circuit still is used for connecting energy conversion component, commercial power and load, select different operating condition through change over switch circuit, the control unit exports control signal to bridge circuit according to operating condition, make bridge circuit act as direct current conversion circuit under energy conversion component charges, act as rectifier circuit under commercial power charges, act as inverter circuit under power supply output, thereby make energy storage battery can with energy conversion component, commercial power and load adaptation use, and share bridge circuit under three kinds of states, it is not only strong and with low costs to see this energy storage circuit suitability.
It should be noted that the above-described device embodiments are merely illustrative, where the units described as separate parts may or may not be physically separate, and the parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; within the idea of the utility model, also technical features in the above embodiments or in different embodiments may be combined, steps may be implemented in any order, and there are many other variations of the different aspects of the utility model as described above, which are not provided in detail for the sake of brevity; although the present 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 solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. A tank circuit, comprising: the energy storage battery, the charging and discharging circuit, the bridge circuit, the change-over switch circuit and the control unit;
the first end of the charge-discharge circuit is connected with the energy storage battery, and the charge-discharge circuit is used for providing a charge-discharge loop for the energy storage battery;
the first end of the bridge circuit is connected with the second end of the charge and discharge circuit, the second end of the bridge circuit is connected with the first end of the change-over switch circuit, and the third end of the bridge circuit is connected with the control unit;
the second end of the change-over switch circuit is used for connecting an energy conversion element, the third end of the change-over switch circuit is used for connecting a commercial power, the fourth end of the change-over switch circuit is used for connecting a load, and the change-over switch circuit is used for controlling the on-off state of the bridge circuit and the energy conversion element, controlling the on-off state of the bridge circuit and the commercial power and controlling the on-off state of the bridge circuit and the load;
when the bridge circuit is communicated with the energy conversion element, the control unit is used for outputting a first control signal to the bridge circuit, and the bridge circuit is used for converting a first direct current of the energy conversion element into a second direct current according to the first control signal and outputting the second direct current to the charging and discharging circuit so as to charge the energy storage battery; when the bridge circuit is communicated with the mains supply, the control unit is used for outputting a second control signal to the bridge circuit, and the bridge circuit is used for converting the first alternating current of the mains supply into a third direct current according to the second control signal and outputting the third direct current to the charging and discharging loop so as to charge the energy storage battery; when the bridge circuit is communicated with the load, the control unit is used for outputting a third control signal to the bridge circuit, and the bridge circuit is used for converting a fourth direct current of the charge-discharge loop into a second alternating current according to the third control signal and outputting the second alternating current to the load so that the energy storage battery supplies power to the load.
2. The energy storage circuit according to claim 1, wherein the bridge circuit comprises a first switching tube, a second switching tube, a third switching tube and a fourth switching tube;
the first end of the first switch tube is respectively connected with the second end of the charge-discharge circuit and the first end of the second switch tube, the second end of the first switching tube is connected with the first end of the third switching tube, the second end of the second switching tube is connected with the first end of the fourth switching tube, the second end of the third switching tube is respectively connected with the third end of the charge-discharge circuit and the second end of the fourth switching tube, the third end of the first switch tube, the third end of the second switch tube, the third end of the third switch tube and the third end of the fourth switch tube are all connected with the control unit, the connection point of the second end of the first switching tube and the first end of the third switching tube is a first common point, and the connection point of the second end of the second switch tube and the first end of the fourth switch tube is a second common point, and the first common point and the second common point are both connected with the change-over switch circuit.
3. The tank circuit of claim 2, wherein the switching circuit comprises a first switching circuit, a second switching circuit, and a third switching circuit;
the first end of the first switch circuit is connected with the first common point, the second end of the first switch circuit is connected with the second common point, the third end and the fourth end of the first switch circuit are used for connecting the energy conversion element, and the first switch circuit is used for switching on or off the connection between the bridge circuit and the energy conversion element;
the first end of the second switch circuit is connected with the first common point, the second end of the second switch circuit is connected with the second common point, the third end and the fourth end of the second switch circuit are used for connecting the commercial power, and the second switch circuit is used for switching on or off the connection between the bridge circuit and the commercial power;
the first end of the third switch circuit is connected with the first common point, the second end of the third switch circuit is connected with the second common point, the third end and the fourth end of the third switch circuit are used for connecting the load, and the third switch circuit is used for switching on or off the connection between the bridge circuit and the load.
4. The tank circuit of claim 3 wherein the first switching circuit comprises a first switch and a second switch;
the first switch is connected in series between the first common point and the first end of the energy conversion element, and the second switch is connected in series between the second common point and the second end of the energy conversion element.
5. The tank circuit of claim 4 wherein the second switching circuit comprises a third switch and a fourth switch;
the third change-over switch is connected between the first common point and the first end of the commercial power in series, and the fourth change-over switch is connected between the second common point and the second end of the commercial power in series.
6. The tank circuit of claim 5, wherein the third switching circuit comprises a fifth switch and a sixth switch;
the fifth change-over switch is connected in series between the first common point and the first end of the load, and the sixth change-over switch is connected in series between the second common point and the second end of the load.
7. The tank circuit according to any of claims 3-6, further comprising a seventh diverter switch and an eighth diverter switch;
the seventh change-over switch is connected in series between the first end of the commercial power and the first end of the load, and the eighth change-over switch is connected in series between the second end of the commercial power and the second end of the load.
8. The tank circuit of claim 3, further comprising a filter circuit;
the first end of the filter circuit is connected with the first common point, the second end of the filter circuit is connected with the second common point, the third end of the filter circuit is respectively connected with the first end of the first switch circuit, the first end of the second switch circuit and the first end of the third switch circuit, and the fourth end of the filter circuit is respectively connected with the second end of the first switch circuit, the second end of the second switch circuit and the second end of the third switch circuit.
9. The tank circuit of claim 8 wherein the filter circuit comprises an inductor and a filter capacitor;
the first end of the inductor is connected to the first common point, the second end of the inductor is connected to the first end of the filter capacitor, the first end of the first switch circuit, the first end of the second switch circuit and the first end of the third switch circuit, respectively, and the second end of the filter capacitor is connected to the second common point, the second end of the first switch circuit, the second end of the second switch circuit and the second end of the third switch circuit, respectively.
10. The tank circuit of claim 1, further comprising a bus capacitor;
one end of the bus capacitor is connected with the second end of the charge and discharge circuit, and the other end of the bus capacitor is connected with the third end of the charge and discharge circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121518753.3U CN215498336U (en) | 2021-07-05 | 2021-07-05 | Energy storage circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121518753.3U CN215498336U (en) | 2021-07-05 | 2021-07-05 | Energy storage circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215498336U true CN215498336U (en) | 2022-01-11 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121518753.3U Active CN215498336U (en) | 2021-07-05 | 2021-07-05 | Energy storage circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215498336U (en) |
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2021
- 2021-07-05 CN CN202121518753.3U patent/CN215498336U/en active Active
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Address after: 518000 19th floor, building 1, kaidar group center building, No. 168, Tongsha Road, Xinwei community, Xili street, Nanshan District, Shenzhen, Guangdong Patentee after: Shenzhen Delian Minghai New Energy Co.,Ltd. Address before: 701-3, building 2, kaidar group center building, 168 Tongsha Road, Xili street, Nanshan District, Shenzhen City, Guangdong Province Patentee before: Shenzhen Poweroak Newener Co.,Ltd. |