CN219041438U - Layered equalization circuit combining flyback circuit and capacitor and equalization power supply - Google Patents

Layered equalization circuit combining flyback circuit and capacitor and equalization power supply Download PDF

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CN219041438U
CN219041438U CN202223374981.5U CN202223374981U CN219041438U CN 219041438 U CN219041438 U CN 219041438U CN 202223374981 U CN202223374981 U CN 202223374981U CN 219041438 U CN219041438 U CN 219041438U
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battery
group
equalization
mos tube
circuit
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黄荣耀
汪吉青
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MCC Tiangong Group Corp Ltd
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MCC Tiangong Group Corp Ltd
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

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Abstract

The utility model provides a layered equalization circuit, comprising: the battery pack comprises two battery sub-groups which are connected in series, wherein each battery sub-group comprises two single batteries which are connected in series; the primary winding is connected with each battery pack in parallel, and the secondary winding is connected with each battery sub-pack in parallel; the first MOS tube assembly comprises two first MOS tubes which are respectively connected with two single batteries of the battery sub-group in parallel; one end of the balanced energy storage inductor is connected with the middle point of the two single batteries, and the other end of the balanced energy storage inductor is connected with the middle point between the two first MOS tubes; the two high-frequency filter capacitors are respectively connected with the primary winding and the secondary winding in parallel; the second MOS tube is connected with the primary winding in series; a diode connected in series with the secondary winding; each group of third MOS tube assemblies comprises two third MOS tubes which are respectively connected with the head and the tail of the battery pack; and a plurality of groups of fourth MOS tube assemblies, wherein each group of fourth MOS tube assemblies comprises two fourth MOS tubes which are respectively connected with the head and the tail of the battery sub-group.

Description

Layered equalization circuit combining flyback circuit and capacitor and equalization power supply
Technical Field
The utility model relates to the technical field of building electric uninterruptible power supplies, in particular to a layered battery equalization circuit combining a flyback circuit and a capacitor, a battery equalization method and an equalization power supply.
Background
Lithium iron phosphate batteries are used as an energy storage battery of an Uninterruptible Power Supply (UPS), and the service life of the battery is one of the core problems of the battery. Because of the different production and use environments, the inconsistency generated in the use process of the battery is increased, and therefore, the battery needs to be managed, and the balanced management of the battery is one of important means for solving the inconsistency of the battery.
The prior equalization circuit is mainly divided into two equalization modes, namely active equalization and passive equalization, wherein the active equalization mainly comprises inductance equalization, capacitance equalization and transformer equalization, and the passive equalization comprises resistance equalization and voltage stabilizing tube equalization.
The transformer equalizing mode can realize energy conversion between non-adjacent batteries to achieve the purpose of similar battery electric quantity, has a simple topological structure and is easy to control, but when the number of the batteries is large, the design difficulty of the multi-winding transformer is increased, the volume of an equalizing circuit is increased, and the equalizing circuit is not easy to expand. The energy conversion between adjacent batteries can be realized by the capacitance equalization mode, the conversion between the electric quantity of the batteries can be realized by controlling the on and off of the switch, the equalization mode has simple structure, is easy to control, has little energy loss in the equalization process, but can not realize the equalization between non-adjacent batteries, and can not realize the large-current equalization when the voltage difference between the adjacent batteries is smaller, and has poorer equalization effect.
The balancing mode of the resistor is mainly characterized in that the resistor is connected with each battery in parallel, redundant electric quantity in the high-electric-quantity battery is consumed through the resistor, so that the purpose of balancing the battery is achieved.
The equalization method in the related art has the following defects:
1. the transformer equalizing circuit is large in size and inconvenient to integrate.
2. Equalization between non-adjacent cells is less convenient and equalization efficiency is lower.
3. The equalizing circuit has complex structure, more devices and higher cost.
Disclosure of Invention
In order to solve the technical problem, an embodiment of an aspect of the present utility model discloses a layered equalization circuit combining a flyback circuit and a capacitor, which is characterized by comprising:
a plurality of battery packs connected in series in sequence, each battery pack including two battery sub-packs connected in series, each battery sub-pack including two unit cells connected in series;
the primary winding is connected with each battery pack in parallel, and the secondary winding is connected with each battery sub-pack in parallel;
each group of first MOS tube assemblies comprises two first MOS tubes which are respectively connected with two single batteries of the battery sub-group in parallel, wherein the source electrode of one first MOS tube is connected with the drain electrode of the other first MOS tube;
one end of the balanced energy storage inductor is connected with the middle point of the two single batteries of the battery sub-group, and the other end of the balanced energy storage inductor is connected with the middle point between the two first MOS tubes;
the first high-frequency filter capacitor is connected with the primary winding of the transformer in parallel;
the second high-frequency filter capacitor is connected with the secondary winding of the transformer in parallel;
the second MOS tube is connected in series with the primary winding of the transformer;
a diode connected in series with the secondary winding of the transformer;
each group of third MOS tube assemblies comprises two third MOS tubes which are respectively connected with the head and the tail of the battery pack; and
each group of the fourth MOS tube assemblies comprises two fourth MOS tubes which are respectively connected with the head and the tail of the battery sub-group;
the first high-frequency filter capacitor, the second high-frequency filter capacitor, the transformer and the diode form a flyback circuit.
According to some embodiments of the utility model, the single cell is a secondary battery.
According to some embodiments of the utility model, the secondary battery is one of a lead-acid battery, a lithium ion battery, a nickel-metal hydride battery, and a supercapacitor.
An embodiment according to another aspect of the present utility model further provides an equalizing power supply, including a layered equalizing circuit combining a flyback circuit and a capacitor as described above.
The layered equalization circuit combining the flyback circuit and the capacitor according to the embodiment of the utility model has the following effects:
compared with the traditional transformer type equalizing circuit, the transformer has smaller volume, saves space in a vehicle, is easy to modularized, and greatly improves the expansibility of the circuit; the electric energy conversion between the non-adjacent batteries is more convenient, so that the equalization efficiency between the non-adjacent batteries is improved, and the equalization time is shortened; compared with the traditional inductance and capacitance equalization circuit, the number of used elements is effectively reduced, the circuit scale is simplified, and the circuit cost is reduced.
Drawings
FIG. 1 is a topology diagram of a layered equalization circuit incorporating flyback circuits and capacitors in accordance with an exemplary embodiment of the present utility model;
FIG. 2 is a battery sub-group equalization circuit topology of a layered equalization circuit combining flyback circuits and capacitors, according to an exemplary embodiment of the present utility model;
FIG. 3 is an in-battery equalization circuit topology of a layered equalization circuit combining flyback circuits and capacitors, according to an exemplary embodiment of the present utility model;
FIG. 4 is a battery pack and battery sub-pack balancing circuit topology of a layered balancing circuit incorporating flyback circuits and capacitors in accordance with an exemplary embodiment of the present utility model;
fig. 5 schematically shows a topology diagram of an equalization circuit between battery packs of a layered equalization circuit combining a flyback circuit and a capacitor according to an embodiment of the present utility model.
Detailed Description
The present utility model will be further described in detail below with reference to specific embodiments and with reference to the accompanying drawings, in order to make the objects, technical solutions and advantages of the present utility model more apparent.
It should be understood that the description is only illustrative and is not intended to limit the scope of the utility model. In the following detailed description, for purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of the embodiments of the utility model. It may be evident, however, that one or more embodiments may be practiced without these specific details. In the following description, descriptions of well-known techniques are omitted so as not to unnecessarily obscure the concept of the present utility model.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model. The term "comprising" as used herein indicates the presence of a feature, step, or step, but does not preclude the presence or addition of one or more other features.
Where expressions like at least one of "A, B and C, etc. are used, the expressions should generally be interpreted in accordance with the meaning as commonly understood by those skilled in the art (e.g.," a system having at least one of A, B and C "shall include, but not be limited to, a system having a alone, B alone, C alone, a and B together, a and C together, B and C together, and/or A, B, C together, etc.). Where a formulation similar to at least one of "A, B or C, etc." is used, in general such a formulation should be interpreted in accordance with the ordinary understanding of one skilled in the art (e.g. "a system with at least one of A, B or C" would include but not be limited to systems with a alone, B alone, C alone, a and B together, a and C together, B and C together, and/or A, B, C together, etc.).
All terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art unless otherwise defined. It should be noted that the terms used herein should be construed to have meanings consistent with the context of the present specification and should not be construed in an idealized or overly formal manner.
Fig. 1 is a topology diagram of a layered equalization circuit combining a flyback circuit and a capacitor according to an exemplary embodiment of the present utility model.
In order to solve the technical problem, an embodiment of an aspect of the present utility model discloses a layered equalization circuit combining a flyback circuit and a capacitor, which is characterized by comprising:
a plurality of battery packs connected in series in sequence, each battery pack including two battery sub-packs connected in series, each battery sub-pack including two unit cells connected in series;
the primary winding is connected with each battery pack in parallel, and the secondary winding is connected with each battery sub-pack in parallel;
each group of first MOS tube assemblies comprises two first MOS tubes which are respectively connected with two single batteries of the battery sub-group in parallel, wherein the source electrode of one first MOS tube is connected with the drain electrode of the other first MOS tube;
one end of the balanced energy storage inductor is connected with the middle point of the two single batteries of the battery sub-group, and the other end of the balanced energy storage inductor is connected with the middle point between the two first MOS tubes;
the first high-frequency filter capacitor is connected with the primary winding of the transformer in parallel;
the second high-frequency filter capacitor is connected with the secondary winding of the transformer in parallel;
the second MOS tube is connected in series with the primary winding of the transformer;
the diode is connected in series with the secondary winding of the transformer;
each group of third MOS tube assemblies comprises two third MOS tubes which are respectively connected with the head and the tail of the battery pack; and
each group of fourth MOS tube assemblies comprises two fourth MOS tubes which are respectively connected with the head and the tail of the battery sub-group;
the first high-frequency filter capacitor, the second high-frequency filter capacitor, the transformer and the diode form a flyback circuit.
According to some embodiments of the utility model, the cell is a secondary battery.
According to some embodiments of the utility model, the secondary battery is one of a lead-acid battery, a lithium ion battery, a nickel-metal hydride battery, and a supercapacitor.
According to an embodiment of another aspect of the present utility model, there is also provided a battery equalization method using the hierarchical equalization circuit as described above, including:
in response to the voltage difference between two single batteries in the battery sub-group being greater than a preset threshold, a first MOS tube connected in parallel with the single battery with higher voltage is conducted, a body diode conducted by the other first MOS tube is turned off, and the single battery with higher voltage and an inductor in the battery sub-group form a conduction loop and are charged by the inductor;
the first MOS tube connected in parallel with the single battery with higher voltage is turned off, the body diode of the other first MOS tube is turned on, and the inductor charges the single battery with lower voltage;
and repeatedly executing the steps until the voltage difference of the two single batteries is equal to or smaller than a preset threshold value, and ending the balance among the single batteries in the battery sub-group.
According to some embodiments of the utility model, the plurality of battery sub-groups are capable of performing equalization within the battery sub-groups simultaneously.
According to some embodiments of the utility model, in response to the voltage difference between two battery sub-groups within the battery group being greater than a preset threshold, further comprising:
the third MOS tube which is positioned at the primary side of the transformer and connected with the head and tail of the battery pack is continuously conducted, the second MOS tube is conducted, and the battery pack charges the primary winding of the transformer;
the second MOS tube is turned off, a fourth MOS tube which is positioned at the secondary side of the transformer and connected with the head and the tail of the battery sub-group with lower voltage in the battery pack is turned on, and the secondary side winding of the transformer is matched with a diode and a second high-frequency filter capacitor to charge the battery sub-group with lower voltage in the battery pack; and
and repeatedly executing the steps until the voltage difference of the two cell subsets is equal to or smaller than a preset threshold value, and ending the equalization between the cell subsets in the battery pack.
According to some embodiments of the utility model, multiple battery packs are capable of performing equalization within the battery packs simultaneously.
According to some embodiments of the utility model, in response to the voltage difference between the battery packs exceeding a preset threshold, further comprising:
the third MOS tube connected with the head and the tail of the battery pack with higher voltage is conducted on the primary side of the transformer, the second MOS tube is conducted, and the battery pack with higher voltage charges the primary side winding of the transformer;
the second MOS tube is turned off, a fourth MOS tube which is positioned on the secondary side of the transformer and connected with the head and the tail of one battery sub-group in the battery group with lower voltage is conducted, the electric energy on the primary side of the transformer is coupled to the secondary side, and the battery sub-group is charged by matching with a diode and a second high-frequency filter capacitor;
repeatedly executing the steps until the voltage difference between the battery pack with higher voltage and the battery sub-pack is equal to or smaller than a preset threshold value, and stopping charging the battery sub-pack;
the third MOS tube connected with the head and the tail of the battery pack with higher voltage is conducted on the primary side of the transformer, the second MOS tube is conducted, and the battery pack with higher voltage charges the primary side winding of the transformer;
the second MOS tube is turned off, a fourth MOS tube which is positioned on the secondary side of the transformer and connected with the head and tail of the other battery sub-group in the battery group with lower voltage is turned on, the electric energy on the primary side of the transformer is coupled to the secondary side, and the other battery sub-group is charged by matching with a diode and a second high-frequency filter capacitor;
repeating the steps until the voltage difference between the battery pack with higher voltage and the battery sub-pack is equal to or smaller than a preset threshold value, and stopping charging the battery sub-pack.
According to some embodiments of the present utility model, the battery packs are charged by the battery pack with the largest voltage to the battery pack with the smallest voltage, and after the voltage difference between all the battery packs is equal to or smaller than the preset threshold value, the equalization between the battery packs is ended.
An embodiment according to still another aspect of the present utility model further provides an equalizing power supply, including a layered equalizing circuit combining a flyback circuit and a capacitor as described above.
The layered equalization circuit combining the flyback circuit and the capacitor according to the embodiment of the utility model has the following effects:
compared with the traditional transformer type equalizing circuit, the transformer has smaller volume, saves space in a vehicle, is easy to modularized, and greatly improves the expansibility of the circuit; the electric energy conversion between the non-adjacent batteries is more convenient, so that the equalization efficiency between the non-adjacent batteries is improved, and the equalization time is shortened; compared with the traditional inductance and capacitance equalization circuit, the number of used elements is effectively reduced, the circuit scale is simplified, and the circuit cost is reduced.
The technical solutions of the present application are further described and illustrated below with reference to the accompanying drawings and specific embodiments, and it should be understood that the specific embodiments are for facilitating the better understanding of the technical solutions of the present utility model by those skilled in the art, and should not be taken as limiting the scope of the present utility model. Referring to fig. 1, the present utility model provides a layered battery equalization circuit combining a flyback circuit and a capacitor.
The circuit comprises a single battery B 1 -B 4n The single batteries are connected in series, every 4 single batteries are a group of battery packs, each group of battery packs is divided into 2 battery sub-groups, and each battery sub-group comprises 2 single batteries B 1 、B 2 。
MOS tube S 0-1 Source electrode and S 0-2 Drain electrode connected with single battery B 1 、B 2 And are connected in parallel.
Balanced energy storage inductance L 1 One end of the battery is connected with the single battery B 1 And B is connected with 2 The other end is connected with the MOS tube S 0-1 、S 0-2 And is electrically connected.
High-frequency filter capacitor C 1 The MOS tube S is connected with the primary side winding of the transformer T in parallel, and the MOS tube S is connected with the primary side winding of the transformer in series.
Every 2 MOS tubes on the primary side of the transformer are a group, and the MOS tubes S 1-1 、S 1-2 Respectively connected with the head and the tail of the battery pack. Transformer secondary side winding and diode D 1 Series connection, high frequency filter capacitor C 1 Is connected in parallel with the secondary winding. The MOS tubes on the secondary side are consistent with the MOS tubes on the primary side, and each 2 MOS tubes are a groupS 2-1 、S 2-2 And are connected with the battery sub-groups end to end respectively.
FIG. 2 is a battery sub-group equalization circuit topology of a layered equalization circuit combining flyback circuits and capacitors, according to an exemplary embodiment of the present utility model; FIG. 3 is an in-battery equalization circuit topology of a layered equalization circuit combining flyback circuits and capacitors, according to an exemplary embodiment of the present utility model; FIG. 4 is a battery pack and battery sub-pack balancing circuit topology of a layered balancing circuit incorporating flyback circuits and capacitors in accordance with an exemplary embodiment of the present utility model; fig. 5 schematically shows a topology diagram of an equalization circuit between battery packs of a layered equalization circuit combining a flyback circuit and a capacitor according to an embodiment of the present utility model.
The specific working steps of the equalizing circuit are as follows:
the first step: as shown in fig. 2, when the battery cell B 1 Voltage is greater than that of single battery B 2 During the process, MOS tube S 0-1 On, the body diode of the MOS tube is turned off, and the single battery B 1 And energy storage inductance L 1 The battery charges the inductor to form a conductive loop.
And a second step of: MOS tube S 0-1 Turn-off MOS tube S 0-2 Is conducted by the body diode of (B) single battery 2 Energy storage inductance L 1 And MOS tube S 0-2 The body diode forms a conducting loop and stores energy inductance L 1 To single battery B 2 Charging is performed.
And a third step of: through the first and second steps of circulation, the single battery B 1 And pass inductance L 1 For single battery B 2 Charging single battery B 2 、B 1 The voltage difference between the two batteries is gradually reduced, and when the voltage difference between the two batteries is smaller than the equalization threshold value, the equalization between the two batteries is ended.
Fourth step: and when the 1 st battery sub-group performs the first, second and third steps, if the voltage difference among the single batteries in the battery sub-groups in other battery groups does not meet the balance threshold value, the first, second and third steps are performed in the corresponding battery sub-groups at the same time until the voltage differences among the single batteries in all the battery sub-groups meet the requirement of the balance threshold value, and then the balance in the battery sub-groups is stopped.
Fifth step: after balancing the battery sub-groups according to fig. 3, if the voltage of the first battery sub-group is lower and the voltage difference between the two battery sub-groups is greater than the balancing threshold in the 2 nd battery group, the battery group 1 charges the first battery sub-group, and the primary side MOS tube S of the transformer 1-3 、S 1-4 The MOS tube S is continuously conducted, the battery pack 1 charges the primary coil of the transformer through the high-frequency filter capacitor.
Sixth step: MOS tube S is turned off, primary side electric energy of the transformer is coupled to secondary side, and secondary side MOS tube S of the transformer 2-5 And S is equal to 2-6 Conducting, the secondary side of the transformer passes through a diode D 1 And high-frequency filter capacitor C 2 The first battery subgroup is charged.
Seventh step: repeating the fifth and sixth steps, gradually reducing the voltage difference between the first and second battery sub-groups, and stopping balancing between the same battery group and the battery sub-groups when the voltage difference between the two battery sub-groups is smaller than the balancing threshold value.
Eighth step: and after the 2 nd battery pack finishes the fifth, sixth and seventh steps, if the voltage difference between the two battery sub-groups in the other battery packs is greater than the equalization threshold, continuing the fifth, sixth and seventh steps until the voltage difference between the two battery sub-groups in each battery pack is less than the equalization threshold, and stopping equalization between the same battery pack and the battery sub-groups.
Ninth step: after the above steps are completed, voltages among all battery sub-groups in the battery pack basically tend to be consistent, but the voltages among the battery packs may have differences, when the voltage difference between the battery pack 1 and the battery pack 2 is larger than an inter-group equalization threshold, inter-group equalization of the battery packs 1 and 2 is performed, and if the voltage value of the 2 nd battery pack is higher than the 1 st battery pack voltage and the voltage difference between the battery packs is larger than the equalization threshold, the 2 nd battery pack charges the 1 st battery pack.
Tenth step: as shown in FIG. 4, the MOS transistor S on the primary side 1-4 、S 1-3 The MOS tube S is continuously conducted, and the battery pack 2 charges the primary side winding of the transformer through the high-frequency filter capacitor. MOS tube S is turned off, and MOS tube S on secondary side of transformer 2-1 And S is equal to 2-2 Conducting, primary side electric energy is coupled to secondary side, through diode D 1 And high-frequency filter capacitor C 2 Charging the first battery sub-group in the battery group 1, and stopping the battery group 2 from charging the first battery sub-group in the battery group 1 when the difference value between the voltage of one battery sub-group and the equalization target value is smaller than the equalization threshold value.
Eleventh step: after the tenth equalization step is completed, the second battery sub-group in the battery pack 1 is charged according to the tenth equalization step until the second battery sub-group also meets the equalization requirement, the battery pack 2 is stopped from charging the second battery sub-group in the battery pack 1, and inter-group equalization between the battery packs 1 and 2 is stopped.
Twelfth step: after balancing the battery pack 1 by the battery pack 2 through the ninth, tenth and eleventh steps, if the battery packs which do not meet the balancing target exist in the battery packs, detecting the voltage values of other battery packs, charging the battery pack with the minimum voltage by the battery pack with the maximum voltage value, and continuing the ninth, tenth and eleventh steps until all the battery packs meet the requirements, ending balancing among the battery packs, and finishing balancing the batteries.
Thus, embodiments of the present utility model have been described in detail with reference to the accompanying drawings. It should be noted that, in the drawings or the text of the specification, implementations not shown or described are all forms known to those of ordinary skill in the art, and not described in detail. Furthermore, the above definitions of the components are not limited to the specific structures, shapes or modes mentioned in the embodiments, and may be simply modified or replaced by those of ordinary skill in the art.
It should also be noted that in the embodiments of the present utility model, unless otherwise known, numerical parameters in the present specification and attached claims are approximations that may vary depending upon the desired properties sought to be obtained by the present utility model. In particular, all numbers expressing dimensions, range conditions, and so forth, used in the specification and claims are to be understood as being modified in all instances by the term "about". In general, the meaning of expression is meant to include a variation of + -10% in some embodiments, a variation of + -5% in some embodiments, a variation of + -1% in some embodiments, and a variation of + -0.5% in some embodiments by a particular amount.
Those skilled in the art will appreciate that the features recited in the various embodiments of the utility model and/or in the claims may be combined in various combinations and/or combinations, even if such combinations or combinations are not explicitly recited in the utility model. In particular, the features recited in the various embodiments of the utility model and/or in the claims can be combined in various combinations and/or combinations without departing from the spirit and teachings of the utility model. All such combinations and/or combinations fall within the scope of the utility model.
The foregoing description of the embodiments has been provided for the purpose of illustrating the general principles of the utility model, and is not meant to limit the utility model thereto, but to limit the utility model thereto, and any modifications, equivalents, improvements and equivalents thereof may be made without departing from the spirit and principles of the utility model.

Claims (4)

1. A layered equalization circuit combining a flyback circuit and a capacitor, comprising:
a plurality of battery packs connected in series in sequence, each battery pack including two battery sub-packs connected in series, each battery sub-pack including two unit cells connected in series;
the primary winding is connected with each battery pack in parallel, and the secondary winding is connected with each battery sub-pack in parallel;
each group of first MOS tube assemblies comprises two first MOS tubes which are respectively connected with two single batteries of the battery sub-group in parallel, wherein the source electrode of one first MOS tube is connected with the drain electrode of the other first MOS tube;
one end of the balanced energy storage inductor is connected with the middle point of the two single batteries of the battery sub-group, and the other end of the balanced energy storage inductor is connected with the middle point between the two first MOS tubes;
the first high-frequency filter capacitor is connected with the primary winding of the transformer in parallel;
the second high-frequency filter capacitor is connected with the secondary winding of the transformer in parallel;
the second MOS tube is connected in series with the primary winding of the transformer;
a diode connected in series with the secondary winding of the transformer;
each group of third MOS tube assemblies comprises two third MOS tubes which are respectively connected with the head and the tail of the battery pack; and
each group of the fourth MOS tube assemblies comprises two fourth MOS tubes which are respectively connected with the head and the tail of the battery sub-group;
the first high-frequency filter capacitor, the second high-frequency filter capacitor, the transformer and the diode form a flyback circuit.
2. The layered equalization circuit combining a flyback circuit and a capacitor of claim 1 wherein the cell is a secondary battery.
3. The layered equalization circuit combining a flyback circuit and a capacitor of claim 2 wherein the secondary battery is one of a lead-acid battery, a lithium ion battery, a nickel-metal hydride battery, and a supercapacitor.
4. An equalising power supply comprising a layered equalising circuit incorporating a flyback circuit and a capacitor as claimed in any one of claims 1 to 3.
CN202223374981.5U 2022-12-06 2022-12-06 Layered equalization circuit combining flyback circuit and capacitor and equalization power supply Active CN219041438U (en)

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