CN107069876B - Unidirectional active equalization circuit for energy storage - Google Patents
Unidirectional active equalization circuit for energy storage Download PDFInfo
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- CN107069876B CN107069876B CN201710300199.3A CN201710300199A CN107069876B CN 107069876 B CN107069876 B CN 107069876B CN 201710300199 A CN201710300199 A CN 201710300199A CN 107069876 B CN107069876 B CN 107069876B
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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
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
- H02J7/0014—Circuits for equalisation of charge between batteries
- H02J7/0016—Circuits for equalisation of charge between batteries using shunting, discharge or bypass circuits
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Abstract
A unidirectional active equalization circuit for energy storage is used for managing the charging process of a battery and is characterized by comprising a plurality of basic equalization units; the basic equalization unit comprises a front-stage half-bridge circuit, a high-frequency transformer connected with the front-stage half-bridge circuit and a plurality of rear-stage modules connected with the high-frequency transformer; the rear-stage module comprises an adjusting circuit, a feedback circuit connected with the adjusting circuit, a control circuit connected with the feedback circuit and diodes D6 and D7; the unidirectional active equalization circuit for energy storage is provided with a positive power supply end, a negative power supply end and a plurality of output ends. The unidirectional active equalization circuit for energy storage, provided by the invention, enables the unidirectional active equalization circuit for energy storage to be compatible with a series battery pack formed by various types of batteries through the parallel connection of a plurality of basic equalization circuits, realizes the equalization charge of the series battery pack, provides larger equalization capacity, and reduces the management cost of the series battery pack charge.
Description
Technical Field
The invention relates to battery management, in particular to a unidirectional active equalization circuit for energy storage.
Background
In the energy storage field, batteries are typically connected in series at the output to obtain a relatively large total voltage to drive a load. In the charging process of the batteries, it is required to ensure that each battery in the series is fully charged in an equalization manner, so that an excessive difference between the charging state of the individual batteries and the overall level cannot be obtained after the charging is completed.
Many types of batteries are used in energy storage applications, such as lead-acid storage batteries, lithium iron phosphate batteries, ternary lithium batteries, nickel-hydrogen batteries, super capacitors and the like, and the traditional equalization circuit has a narrow operating voltage range, so that the equalization circuit can only generally adapt to a certain type of battery. And the capacity of the battery unit of the battery pack is large, and a conventional equalization circuit cannot provide enough equalization current.
Disclosure of Invention
Based on the above, the invention provides the unidirectional active equalization circuit for energy storage, which can support multiple storage battery types and has larger equalization capacity.
In order to achieve the purpose of the invention, the invention adopts the following technical scheme:
the unidirectional active equalization circuit for energy storage is characterized by comprising a plurality of basic equalization units; the basic equalization unit comprises a front-stage half-bridge circuit, a high-frequency transformer connected with the front-stage half-bridge circuit and a plurality of rear-stage modules connected with the high-frequency transformer; the rear-stage module comprises an adjusting circuit, a feedback circuit connected with the adjusting circuit, a control circuit connected with the feedback circuit, a diode D6 and a diode D7; the unidirectional active equalization circuit for energy storage is provided with a positive power supply end, a negative power supply end and a plurality of output ends.
According to the unidirectional active equalization circuit for energy storage, the unidirectional active equalization circuits for energy storage are adapted to the battery packs with different series numbers of the battery cores through the parallel connection of the plurality of basic equalization circuits, so that the equalization charge of the series battery packs of the type is realized, the larger equalization capacity is provided, and the management cost of the charge of the series battery packs is reduced. Because the unidirectional active equalization circuit and the magnetic amplifier post-stage adjusting circuit are adopted, the working point of the whole equalization circuit is very wide, so that the equalization circuit can be compatible with various types of batteries.
In one embodiment, the front-stage half-bridge circuit includes a capacitor C1, a capacitor C2, a capacitor C3, and a switching tube Q1 and a switching tube Q2; the front-stage half-bridge circuit is provided with a positive electrode connecting end, a negative electrode connecting end, a homonymous primary side connecting end and a heteronymous primary side connecting end; positive electrode connection ends of the front half-bridge circuits of all the basic equalization units are converged to form a positive power supply end of the unidirectional active equalization circuit for energy storage; and the negative electrode connecting end wires of the front half-bridge circuits of all the basic equalization units are converged to form a negative power supply end of the unidirectional active equalization circuit for energy storage.
In one embodiment, the switching tube Q1 and the switching tube Q2 are respectively provided with a first switching end, a second switching end and a third switching end; one end of the capacitor C1 is used as an anode connecting end of the front-stage half-bridge circuit; one end of the capacitor C1 is connected with the first connecting end of the switching tube Q1; the third switch end of the switch tube Q1 is used as a same-name primary side connection end of the front-stage half-bridge circuit and is connected with the high-frequency transformer; the third switch end of the switch tube Q1 is also connected with the first switch end of the switch tube Q2; the other end of the capacitor C1 is connected with one end of the capacitor C2; the other end of the capacitor C1 is also connected with one end of the capacitor C3; the other end of the capacitor C2 is used as the negative electrode connecting end of the front-stage half-bridge circuit; the other end of the capacitor C2 is connected with a third switch end of the switch tube Q2; the other end of the capacitor C3 is used as a different-name primary side connecting end of the front-stage half-bridge circuit and is connected with the high-frequency transformer.
In one embodiment, the switching transistors Q1 and Q2 are insulated gate bipolar transistors; the first switch end, the second switch end and the third switch end of the switch tube Q1 and the switch tube Q2 are respectively a collector electrode, a grid electrode and an emitter electrode; an internal diode is connected in parallel inside the switching tube Q1 and the switching tube Q2; the cathodes of the diodes in the switch tube Q1 and the switch tube Q2 are connected with the collector thereof; and anodes of the in-vivo diodes of the switching tube Q1 and the switching tube Q2 are connected with emitters thereof.
In one embodiment, the high-frequency transformer comprises a primary winding Np and a plurality of secondary windings Ns; the homonymous end of the primary winding Np of the high-frequency transformer is connected with the homonymous primary connecting end of the front-stage half-bridge circuit; and the different name end of the primary winding Np of the high-frequency transformer is connected with the different name primary connection end of the front-stage half-bridge circuit.
In one embodiment, the high-frequency transformer comprises a primary winding Np and a plurality of secondary windings Ns; the secondary winding Ns of the high-frequency transformer is provided with a middle tap; the regulating circuit is provided with a positive secondary connecting end, a negative secondary connecting end and a node connecting end; the positive secondary connection end, the negative secondary connection end and the node connection end of the regulating circuit are respectively connected with the homonymous end, the heteronymous end and the middle tap of the secondary winding Ns.
In one embodiment, the regulating circuit is provided with a positive charging end and a negative charging end; the regulating circuit comprises a magnetic amplifier Nm1, a magnetic amplifier Nm2, a diode D3, a diode D4, an inductor L1 and a capacitor C2; one end of the magnetic amplifier Nm1 is used as a positive secondary connection end of the regulating circuit; the other end of the magnetic amplifier Nm1 is connected with the anode of the diode D3; the cathode of the diode D3 is connected with one end of the inductor L1; the cathode of the diode D3 is also connected with the cathode of the diode D4; the anode of the diode D4 is used as a node connecting end of the regulating circuit; the other end of the inductor L1 is used as a positive charging end of the regulating circuit; the other end of the inductor L1 is connected with one end of the capacitor C4; the other end of the capacitor C4 is connected with the anode of the diode D4; the other end of the capacitor C4 is used as a negative charging end of the regulating circuit; one end of the magnetic amplifier Nm2 is used as a negative secondary connection end of the regulating circuit; the other end of the magnetic amplifier Nm2 is connected with the anode of the diode D5; the cathode of the diode D5 is connected with the cathode of the diode D3; one end of the magnetic amplifier Nm1, one end of the magnetic amplifier Nm2 and the anode of the diode D4 are respectively connected with the homonymous end, the heteronymous end and the middle tap of one secondary winding Ns of the high-frequency transformer;
the positive electrode of the capacitor C4 is connected with the other end of the inductor L1; the negative electrode of the capacitor C4 is connected with the anode of the diode D4.
In one embodiment, the feedback circuit is provided with a first input end, a second input end and a feedback end; the first input end and the second input end of the feedback circuit are respectively connected with two ends of the capacitor C4.
In one embodiment, the control circuit is provided with a first switch piece control end, a second switch piece control end and a signal input end; the signal input end of the control circuit is connected with the feedback end of the feedback circuit; the control end of the first switch piece of the control circuit is connected with the anode of the diode D6; the cathode of the diode D6 is connected with the other end of the magnetic amplifier Nm 1; the control end of the second switch piece of the control circuit is connected with the anode of the diode D7; the cathode of the diode D7 is connected to the other end of the magnetic amplifier Nm 2.
Drawings
FIG. 1 is a schematic diagram of an overall structure of a unidirectional active equalization circuit for energy storage according to a preferred embodiment of the present invention;
fig. 2 is a circuit diagram of a basic equalization unit in the unidirectional active equalization circuit for energy storage shown in fig. 1;
fig. 3 is a circuit diagram of a subsequent stage module in the basic equalizing unit shown in fig. 2.
Detailed Description
The present invention will be described more fully hereinafter in order to facilitate an understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
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 invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
Referring to fig. 1 to 3, a unidirectional active equalization circuit 10 for energy storage according to a preferred embodiment of the present invention is used for managing a charging process of a battery, wherein the unidirectional active equalization circuit 10 for energy storage uses electric energy of an external power source to charge a series battery pack formed by connecting various batteries in series; the unidirectional active equalization circuit 10 for energy storage can keep the charge states of the batteries close to each other in the charging process of the series battery pack. The unidirectional active equalization circuit 10 for energy storage comprises a plurality of basic equalization units 20; the basic equalizing unit 20 comprises a front half-bridge circuit 30, a high-frequency transformer 40 connected with the front half-bridge circuit 30, and a plurality of rear modules 50 connected with the high-frequency transformer 40; the back-end module 50 includes a regulating circuit 60, a feedback circuit 70 connected to the regulating circuit 60, a control circuit 80 connected to the feedback circuit 60, and diodes D6, D7; one side of the unidirectional active equalization circuit 10 for energy storage is connected with a power supply; the other side of the unidirectional active equalization circuit 10 for energy storage is connected with the series battery pack.
The unidirectional active equalization circuit 10 for energy storage is provided with a positive power supply end and a negative power supply end; the positive power supply end and the negative power supply end of the unidirectional active equalization circuit 10 for energy storage are connected to an external power supply; the unidirectional active equalization circuit 10 for energy storage is provided with a plurality of output ends; the output end of the unidirectional active equalization circuit 10 for energy storage is connected with the series battery pack.
Referring to fig. 2, the front-stage half-bridge circuit 30 includes capacitors C1, C2, and C3, and switching transistors Q1 and Q2; the front-stage half-bridge circuit 30 is provided with a positive electrode connecting end, a negative electrode connecting end, a homonymous primary side connecting end and a heteronymous primary side connecting end; positive electrode connection ends of the front half-bridge circuits 30 of all the basic equalization units 20 are converged to form a positive power supply end of the unidirectional active equalization circuit 10 for energy storage; the negative electrode connection ends of the front half-bridge circuits 30 of all the basic equalization units 20 are converged to form a negative power supply end of the unidirectional active equalization circuit 10 for energy storage; the switching tubes Q1 and Q2 are respectively provided with a first switching end, a second switching end and a third switching end; one end of the capacitor C1 is used as an anode connection end of the front-stage half-bridge circuit 30; one end of the capacitor C1 is connected with the first connecting end of the switching tube Q1; the third switch end of the switch tube Q1 is used as the connection end of the primary side of the front half-bridge circuit 30 and is connected with the high-frequency transformer 40; the third switch end of the switch tube Q1 is also connected with the first switch end of the switch tube Q2; the other end of the capacitor C1 is connected with one end of the capacitor C2; the other end of the capacitor C1 is also connected with one end of the capacitor C3; the other end of the capacitor C2 is used as a negative electrode connecting end of the front-stage half-bridge circuit 30; the other end of the capacitor C2 is connected with a third switch end of the switch tube Q2; the other end of the capacitor C3 is connected to the high-frequency transformer 40 as a connection end of the first-stage half-bridge circuit 30.
In one embodiment, a first bus and a second bus are arranged in the unidirectional active equalization circuit for energy storage; the positive electrode connection ends of the front half-bridge circuits 30 of all the basic equalization units 20 are connected with the first bus; the first bus extends out of a positive power supply end of the unidirectional active equalization circuit for energy storage; the negative electrode connection ends of the front half-bridge circuits 30 of all the basic equalization units 20 are connected with the second bus; and the second bus extends out of a negative power supply end of the unidirectional active equalization circuit for energy storage.
The basic equalizing unit 20 further comprises a trigger circuit; the trigger circuit is respectively connected with the second switch end of the switch tube Q1 and the second switch end of the switch tube Q2.
Specifically, the switching transistors Q1 and Q2 are insulated gate bipolar transistors; an internal diode is connected in parallel inside the switching tubes Q1 and Q2; the first switch end, the second switch end and the third switch end of the switch tubes Q1 and Q2 are respectively a collector electrode, a grid electrode and an emitter electrode; the cathodes of the in-vivo diodes of the switching tubes Q1 and Q2 are connected with the collectors thereof; the anodes of the in-vivo diodes of the switching tubes Q1 and Q2 are connected with the emitters thereof.
The high-frequency transformer 40 includes a primary winding Np and a plurality of secondary windings Ns; the homonymous terminal of the primary winding Np of the high-frequency transformer 40 is connected with the homonymous primary terminal of the front-stage half-bridge circuit 30; the synonym end of the primary winding Np of the high-frequency transformer 40 is connected with the synonym primary connection end of the front-stage half-bridge circuit 30; the secondary winding Ns of the high frequency transformer 40 is provided with a center tap; each secondary winding Ns of the high-frequency transformer 40 is connected to a single one of the rear modules 50.
Referring to fig. 3, the adjusting circuit 60 includes magnetic amplifiers Nm1 and Nm2, diodes D3, D4, D5, an inductor L1, and a capacitor C4; the regulating circuit 60 is provided with a positive secondary connection end, a negative secondary connection end, a node connection end, a positive charging end and a negative charging end; one end of the magnetic amplifier Nm1 is used as a positive secondary connection end of the regulating circuit 60; the other end of the magnetic amplifier Nm1 is connected with the anode of the diode D3; the cathode of the diode D3 is connected with one end of the inductor L1; the cathode of the diode D3 is also connected with the cathode of the diode D4; the anode of the diode D4 is used as a node connection terminal of the regulating circuit 60; the other end of the inductance L1 is used as a positive charging end of the regulating circuit 60; the other end of the inductor L1 is connected with one end of the capacitor C4; the other end of the capacitor C4 is connected with the anode of the diode D4; the other end of the capacitor C4 is used as a negative charging end of the regulating circuit 60; one end of the magnetic amplifier Nm2 is used as a negative secondary connection end of the regulating circuit 60; the other end of the magnetic amplifier Nm2 is connected with the anode of the diode D5; the cathode of the diode D5 is connected with the cathode of the diode D3; one end of the magnetic amplifier Nm1, one end of the magnetic amplifier Nm2, and the anode of the diode D4 are connected to the same-name end, the different-name end, and the center tap of one of the secondary windings Ns of the high-frequency transformer 40, respectively.
The positive charging end and the negative charging end of the regulating circuit 60 are used as the output end of the unidirectional active equalization circuit 10 for energy storage; the positive charging end and the negative charging end of the regulating circuit 60 are respectively connected with the positive electrode and the negative electrode of a battery in the series battery pack.
The feedback circuit 70 is provided with a first input end, a second input end and a feedback end; the first input terminal and the second input terminal of the feedback circuit 70 are respectively connected to two ends of the capacitor C2.
The control circuit 80 is provided with a first switch piece control end, a second switch piece control end and a signal input end; the signal input end of the control circuit 80 is connected with the feedback end of the feedback circuit 70; the control end of the first switch element of the control circuit 80 is connected with the anode of the diode D6; the cathode of the diode D6 is connected with the other end of the magnetic amplifier Nm 1; the second switch element control end of the control circuit 80 is connected with the anode of the diode D7; the cathode of the diode D7 is connected to the other end of the magnetic amplifier Nm 2.
In one embodiment, to enhance the filtering effect, the capacitor C4 is an electrolytic capacitor; the positive electrode of the capacitor C4 is connected with the other end of the inductor L1; the negative electrode of the capacitor C4 is connected with the anode of the diode D4.
When the unidirectional active equalization circuit 10 for energy storage works, the unidirectional active equalization circuit 10 for energy storage obtains electric energy input from an external power supply; the unidirectional active equalization circuit 10 for energy storage adopts a control mode that the front half-bridge circuit 30 is opened and the rear module 50 is closed.
Each basic equalizing unit 20 of the unidirectional active equalization circuit 10 for energy storage may be connected with various types of batteries; each basic equalization unit 20 of the unidirectional active equalization circuit 10 for energy storage is connected with only one type of battery at the same time; the trigger circuit adjusts the duty ratio of the on-off of the switching tubes Q1 and Q2 according to the battery type connected with the basic equalization unit 20, so that the pre-stage half-bridge circuit 30 in the basic equalization unit 20 works on an open-loop working point adapted to the battery characteristics of the corresponding type.
The regulating circuits 60 in the same basic equalizing unit 20 can be in a synchronous working state, an asynchronous working state and a non-working state; the basic equalization unit 20 can realize independent equalization management for each battery connected with the basic equalization unit so as to meet the requirements of various working states.
The feedback circuit 70 may detect voltage and current information of the battery connected to the regulating circuit 60 and determine the state of the battery, and feedback the state information of the battery to the control circuit 80; when it is required to stop the operation of a part of the adjusting circuits 60 in the basic equalizing unit 20, the corresponding control circuit 80 may cause the corresponding magnetic amplifiers Nm1 and Nm2 to be in an off state, so that the corresponding adjusting circuits 60 may stop operating, and the adjusting circuits that stop operating do not affect the normal operation of other adjusting circuits 60 in the same basic equalizing unit 20; when it is required to make the partial regulating circuit 60 in the basic equalizing unit 20 perform equalizing charge on the battery connected thereto, the corresponding control circuit 80 sends given signals to the magnetic amplifiers Nm1 and Nm2 through the diodes D6 and D7 according to the feedback signal of the feedback circuit 70 and other regulating signals, respectively, so that the passing currents of the magnetic amplifiers Nm1 and Num2 are regulated according to the magnitudes of the given signals, and the process realizes closed-loop regulation on the equalizing currents by using the magnetic amplifiers Nm1 and Num 2.
The unidirectional energy flow of the unidirectional active equalization circuit 10 for energy storage is only used under the condition of lower battery electric quantity, so that the unidirectional active equalization circuit 10 for energy storage has the advantages of simple and reliable structure, low cost, high efficiency and no secondary equalization problem; the magnetic amplifiers Nm1, num2 can provide a larger equalizing current for the battery.
In this embodiment, the plurality of basic equalization circuits are connected in parallel, so that the unidirectional active equalization circuit for energy storage can be compatible with a series battery pack formed by various types of batteries, equalization charging of the series battery pack of the type is realized, larger equalization capability is provided, and management cost of charging of the series battery pack is reduced.
The above examples illustrate only a few embodiments of the invention, which are described in detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.
Claims (9)
1. The unidirectional active equalization circuit for energy storage is characterized by comprising a plurality of basic equalization units; the basic equalization unit comprises a front-stage half-bridge circuit, a high-frequency transformer connected with the front-stage half-bridge circuit and a plurality of rear-stage modules connected with the high-frequency transformer; the rear-stage module comprises an adjusting circuit, a feedback circuit connected with the adjusting circuit, a control circuit connected with the feedback circuit, a diode D6 and a diode D7; the unidirectional active equalization circuit for energy storage is provided with a positive power supply end, a negative power supply end and a plurality of output ends;
the front-stage half-bridge circuit comprises a capacitor C1, a capacitor C2, a capacitor C3, a switching tube Q1 and a switching tube Q2; the front-stage half-bridge circuit is provided with a positive electrode connecting end, a negative electrode connecting end, a homonymous primary side connecting end and a heteronymous primary side connecting end; positive electrode connection ends of the front half-bridge circuits of all the basic equalization units are converged to form a positive power supply end of the unidirectional active equalization circuit for energy storage; the negative electrode connecting end wires of the front half-bridge circuits of all the basic equalization units are converged to form a negative power supply end of the unidirectional active equalization circuit for energy storage;
the switching tube Q1 and the switching tube Q2 are respectively provided with a first switching end, a second switching end and a third switching end; one end of the capacitor C1 is used as an anode connecting end of the front-stage half-bridge circuit; one end of the capacitor C1 is connected with the first connecting end of the switching tube Q1; the third switch end of the switch tube Q1 is used as a same-name primary side connection end of the front-stage half-bridge circuit and is connected with the high-frequency transformer; the third switch end of the switch tube Q1 is also connected with the first switch end of the switch tube Q2; the other end of the capacitor C1 is connected with one end of the capacitor C2; the other end of the capacitor C1 is also connected with one end of the capacitor C3; the other end of the capacitor C2 is used as the negative electrode connecting end of the front-stage half-bridge circuit; the other end of the capacitor C2 is connected with a third switch end of the switch tube Q2; the other end of the capacitor C3 is used as a different-name primary side connecting end of the front-stage half-bridge circuit and is connected with the high-frequency transformer;
the basic equalization unit further comprises a trigger circuit; the trigger circuit is respectively connected with the second switch end of the switch tube Q1 and the second switch end of the switch tube Q2; the trigger circuit adjusts the duty ratio of the on-off of the switching tubes Q1 and Q2 according to the battery type connected with the basic equalization unit, so that the front half-bridge circuit in the basic equalization unit works on an open-loop working point adapting to the battery characteristics of the corresponding type.
2. The unidirectional active equalization circuit for energy storage of claim 1, wherein a first bus is provided in the unidirectional active equalization circuit for energy storage; the positive electrode connecting ends of the front half-bridge circuits of all the basic equalization units are connected with the first bus; the first bus extends out of the positive power supply end of the unidirectional active equalization circuit for energy storage.
3. The unidirectional active equalization circuit for energy storage of claim 2, wherein a second bus is provided in the unidirectional active equalization circuit for energy storage; the negative electrode connecting ends of the front half-bridge circuits of all the basic equalization units are connected with the second bus; and the second bus extends out of a negative power supply end of the unidirectional active equalization circuit for energy storage.
4. The unidirectional active equalization circuit for energy storage of claim 1, wherein said switching transistor Q1, Q2 are insulated gate bipolar transistors; the first switch end, the second switch end and the third switch end of the switch tube Q1 and the switch tube Q2 are respectively a collector electrode, a grid electrode and an emitter electrode; an internal diode is connected in parallel inside the switching tube Q1 and the switching tube Q2; the cathodes of the diodes in the switch tube Q1 and the switch tube Q2 are connected with the collector thereof; and anodes of the in-vivo diodes of the switching tube Q1 and the switching tube Q2 are connected with emitters thereof.
5. The unidirectional active equalization circuit for energy storage of claim 1, wherein said high frequency transformer comprises a primary winding Np and a plurality of secondary windings Ns; the homonymous end of the primary winding Np of the high-frequency transformer is connected with the homonymous primary connecting end of the front-stage half-bridge circuit; and the different name end of the primary winding Np of the high-frequency transformer is connected with the different name primary connection end of the front-stage half-bridge circuit.
6. The unidirectional active equalization circuit for energy storage of claim 1, wherein said high frequency transformer comprises a primary winding Np and a plurality of secondary windings Ns; the secondary winding Ns of the high-frequency transformer is provided with a middle tap; the regulating circuit is provided with a positive secondary connecting end, a negative secondary connecting end and a node connecting end; the positive secondary connection end, the negative secondary connection end and the node connection end of the regulating circuit are respectively connected with the homonymous end, the heteronymous end and the middle tap of the secondary winding Ns.
7. The unidirectional active equalization circuit for energy storage of claim 6, wherein said regulation circuit has a positive charge terminal and a negative charge terminal; the regulating circuit comprises a magnetic amplifier Nm1, a magnetic amplifier Nm2, a diode D3, a diode D4, a diode D5, an inductor L1 and a capacitor C4; one end of the magnetic amplifier Nm1 is used as a positive secondary connection end of the regulating circuit; the other end of the magnetic amplifier Nm1 is connected with the anode of the diode D3; the cathode of the diode D3 is connected with one end of the inductor L1; the cathode of the diode D3 is also connected with the cathode of the diode D4; the anode of the diode D4 is used as a node connecting end of the regulating circuit; the other end of the inductor L1 is used as a positive charging end of the regulating circuit; the other end of the inductor L1 is connected with one end of the capacitor C4; the other end of the capacitor C4 is connected with the anode of the diode D4; the other end of the capacitor C4 is used as a negative charging end of the regulating circuit; one end of the magnetic amplifier Nm2 is used as a negative secondary connection end of the regulating circuit; the other end of the magnetic amplifier Nm2 is connected with the anode of the diode D5; the cathode of the diode D5 is connected with the cathode of the diode D3; one end of the magnetic amplifier Nm1, one end of the magnetic amplifier Nm2 and the anode of the diode D4 are respectively connected with the homonymous end, the heteronymous end and the middle tap of one secondary winding Ns of the high-frequency transformer;
the positive electrode of the capacitor C4 is connected with the other end of the inductor L1; the negative electrode of the capacitor C4 is connected with the anode of the diode D4.
8. The unidirectional active equalization circuit for energy storage of claim 7, wherein said feedback circuit has a first input terminal, a second input terminal, and a feedback terminal; the first input end and the second input end of the feedback circuit are respectively connected with two ends of the capacitor C4.
9. The unidirectional active equalization circuit for energy storage of claim 8, wherein said control circuit is provided with a first switch element control terminal, a second switch element control terminal, and a signal input terminal; the signal input end of the control circuit is connected with the feedback end of the feedback circuit; the control end of the first switch piece of the control circuit is connected with the anode of the diode D6; the cathode of the diode D6 is connected with the other end of the magnetic amplifier Nm 1; the control end of the second switch piece of the control circuit is connected with the anode of the diode D7; the cathode of the diode D7 is connected to the other end of the magnetic amplifier Nm 2.
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