CN203589784U - Half-bridge ZVS battery string equalization circuit - Google Patents
Half-bridge ZVS battery string equalization circuit Download PDFInfo
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- CN203589784U CN203589784U CN201320718761.1U CN201320718761U CN203589784U CN 203589784 U CN203589784 U CN 203589784U CN 201320718761 U CN201320718761 U CN 201320718761U CN 203589784 U CN203589784 U CN 203589784U
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- bridge
- current mode
- battery strings
- battery
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Abstract
The utility model provides a half-bridge ZVS battery string equalization circuit. The half-bridge ZVS battery string equalization circuit comprises n current type half bridges and an n-winding transformer; each current type half bridge is connected with an individual battery, all the batteries are connected in series to form a battery string, and the number of the individual batteries is n; each winding of the n-winding transformer is connected with one of the current type half bridges; and n is greater than or equal to 2. Compared with energy consumption equalization technology, the half-bridge ZVS battery string equalization circuit provided by the utility model has the advantage of low energy consumption; and compared with present energy transfer equalization technology, the half-bridge ZVS battery string equalization circuit is simple in structure, low in loss, and high in efficiency.
Description
Technical field
The utility model relates to cell balancing field, is specifically related to half-bridge ZVS battery strings equalizing circuit and control method thereof, and the utility model is equally applicable to the equilibrium of super capacitor.
Background technology
Along with the development of electric power system energy storage and electric automobile industry, series battery is widely used, particularly power battery pack, and the battery cell number of series connection is more and more, and capacity is increasing.Due to process conditions restrictions, through after charge and discharge cycle repeatedly, the capacity volume variance of battery cell can be more and more obvious, between battery, can produce larger voltage difference, and the total available capacity of series battery is reduced, and affects serviceability and the life-span of battery pack.
Battery balanced method is divided into two classes, and the one, energy consumes method, by power consumption circuit, the monomer battery voltage that voltage is high is declined, until the cell minimum with voltage is consistent.The method is simple in structure, but energy consumption is larger, and balancing speed is slow, and efficiency is low.The 2nd, energy transfer method, by inductance or capacitance energy storage element cell electric energy transfer high voltage in the low cell of voltage, finally make both reach unanimity by voltage.At present, energy transfer method is mainly applied DC-DC converter technique, and control inductance, electric capacity are realized energy transition, reach the object of battery cell being mended to electricity or electric discharge.The existing battery equalizing circuit based on DC-DC converter technique mainly contains 2 deficiencies, and the one, the more difficult realization of soft switch, causes switching loss very large; The 2nd, all adopt PWM to control, very complicated for the control of the huge switching tube of quantity.
Utility model content
The purpose of this utility model is to overcome above-mentioned the deficiencies in the prior art, proposes half-bridge ZVS battery strings equalizing circuit and control method thereof.
The technical solution adopted in the utility model is: described half-bridge ZVS battery strings equalizing circuit comprises n current mode half-bridge and n winding transformer, is called the 1st kind of battery strings equalizing circuit.Each current mode half-bridge is connected with a battery cell separately, and all battery cells are connected in series formation battery strings, and the number of battery cell is n, and each winding of n winding transformer is connected with a described current mode half-bridge separately; The component parameters of n current mode half-bridge is identical, and the number of turn of each winding of n winding transformer is identical with leakage inductance.
Described half-bridge ZVS battery strings equalizing circuit also comprises n+1 current mode half-bridge and n+1 winding, the 2nd kind of battery strings equalizing circuit.Described n+1 current mode half-bridge is connected with the two ends of described battery strings, and n+1 winding is connected with described n+1 current mode half-bridge; The component parameters that connects the current mode half-bridge that the component parameters reduction of n+1 current mode half-bridge of described battery strings connects with each battery cell to the component parameters of each described battery cell rear flank is identical; The number of turn of described n+1 winding and leakage inductance be the number of turn of winding of each described battery cell side and the n of leakage inductance doubly.
Each current mode half-bridge is comprised of the first switching tube, second switch pipe, the first diode, the second diode, the first electric capacity, the second electric capacity and inductance; Wherein, inverse parallel is on the first switching tube and second switch pipe respectively for the first diode and the second diode, and the source electrode of the first switching tube is connected with the drain electrode of second switch pipe; The negative electrode of the first electric capacity is connected with the anode of the second electric capacity, and the anode of the first electric capacity is connected with the drain electrode of the first switching tube, and the negative electrode of the second electric capacity is connected with the source electrode of second switch pipe; One end of inductance is connected with the source electrode of the first switching tube, and the source electrode of the other end and second switch pipe forms a port of current mode half-bridge; The source electrode of the first switching tube is connected described battery cell or battery strings with another port inductive Ldc that the negative electrode of the first electric capacity forms current mode half-bridge, realizes the input and output of current mode.
The leakage inductance of the winding that in each current mode half-bridge, the junction capacitance of switching tube is connected with this current mode half-bridge forms resonant circuit, and the ZVS that realizes each switching tube in this current mode half-bridge is open-minded.
Further optimize, in described the 1st kind of battery strings equalizing circuit, adopt the square-wave signal of 1/2 pulsewidth to carry out phase shifting control to each current mode half-bridge circuit, take the square wave of 1/2 pulsewidth of stationary phase as reference signal, voltage is greater than to the current mode half-bridge that the battery cell of battery strings average voltage connects to be controlled in advance, voltage is less than to the control that lags behind of current mode half-bridge that the battery cell of battery strings average voltage connects, and leading and lagging phase all adopts fixed value.
Further optimize, in described the 2nd kind of battery strings equalizing circuit, adopt the square-wave signal of 1/2 pulsewidth to carry out phase shifting control to each current mode half-bridge circuit, take the square wave of 1/2 pulsewidth of stationary phase as reference signal, voltage is greater than to the current mode half-bridge that the battery cell of battery strings average voltage connects to be controlled in advance, voltage is less than to the control that lags behind of current mode half-bridge that the battery cell of battery strings average voltage connects, and leading and lagging phase all adopts fixed value; Use the brachium pontis of the current mode half-bridge that described reference signal control is connected with battery strings simultaneously.
Compared with prior art, the utlity model has following advantage and technique effect: the utility model provides half-bridge ZVS battery strings equalizing circuit, compared with energy consumption balancing technique, there is the advantage that energy consumption is low; Compared with shifting balancing technique with present energy, control simply, the ZVS that simultaneously realizes each switching tube is open-minded, and loss is low, and efficiency is high.Described the 2nd kind of battery strings equalizing circuit, the energy that can simultaneously realize battery cell-battery cell, battery cell-battery strings and battery strings-battery cell shifts, and has shortened time for balance.
Accompanying drawing explanation
Fig. 1 a, Fig. 1 b are respectively the 1st kind of battery strings equalizing circuit and the 2nd kind of battery strings equalizing circuits in half-bridge ZVS battery strings equalizing circuit of the present utility model;
Fig. 2 a, Fig. 2 b are respectively current mode half-bridge and the multi winding transformers of the equalizing circuit of half-bridge ZVS battery strings shown in Fig. 1 a or Fig. 1 b;
Fig. 3 is two half-bridge bidirectional DC-DC converters of equivalence in the equalizing circuit of half-bridge ZVS battery strings shown in Fig. 1 a or Fig. 1 b;
Fig. 4 is the control signal occurring principle of each current mode half-bridge in the equalizing circuit of half-bridge ZVS battery strings shown in Fig. 1 a or Fig. 1 b;
Fig. 5 a, Fig. 5 b are respectively the power flow charts of the equalizing circuit of half-bridge ZVS battery strings shown in Fig. 1 a, Fig. 1 b;
Embodiment
For further setting forth content of the present utility model and feature, below in conjunction with accompanying drawing, specific embodiments of the present utility model is specifically described.But enforcement of the present utility model is not limited to this.
With reference to figure 1a, the 1st kind of battery strings equalizing circuit in half-bridge ZVS battery strings equalizing circuit of the present utility model comprises n current mode half-bridge and n winding transformer.Each current mode half-bridge is connected with a battery cell separately, and all battery cells are connected in series formation battery strings, and the number of battery cell is n, and each winding of n winding transformer is connected with a described current mode half-bridge separately; The component parameters of n current mode half-bridge is identical, and the number of turn of each winding of n winding transformer is identical with leakage inductance.
With reference to figure 1b, the 2nd kind of battery strings equalizing circuit in half-bridge ZVS battery strings equalizing circuit of the present utility model, also comprises n+1 current mode half-bridge and n+1 winding.Described n+1 current mode half-bridge is connected with the two ends of described battery strings, and n+1 winding is connected with described n+1 current mode half-bridge; The component parameters that connects the current mode half-bridge that the component parameters reduction of n+1 current mode half-bridge of described battery strings connects with each battery cell to the component parameters of each described battery cell rear flank is identical; The number of turn of described n+1 winding and leakage inductance be the number of turn of winding of each described battery cell side and the n of leakage inductance doubly.
With reference to figure 2a, each current mode half-bridge is by the first switching tube S
1, second switch pipe S
2, the first diode D
1, the second diode D
2, the first capacitor C
1, the second capacitor C
2and inductance L
dccomposition.Wherein, the first diode D
1with the second diode D
2inverse parallel is at the first switching tube S respectively
1with second switch pipe S
2upper, the first switching tube S
1source electrode and second switch pipe S
2drain electrode be connected; The first capacitor C
1negative electrode and the second capacitor C
2anode be connected, the first capacitor C
1anode and the first switching tube S
1drain electrode be connected, the second capacitor C
2negative electrode and second switch pipe S
2source electrode be connected; Inductance L
dcone end and the first switching tube S
1source electrode be connected, the other end and second switch pipe S
2source electrode form the port Port1 of current mode half-bridge; The first switching tube S
1source electrode and the first capacitor C
1negative electrode form the port Port2 of current mode half-bridge.Inductance L dc connects described battery cell or battery strings, realizes the input and output of current mode.By the control to brachium pontis, can realize power stream two-way flow in current mode half-bridge.
With reference to figure 2b, in described the 1st kind of battery strings equalizing circuit the port Port1 of n winding transformer to port Port n separately the current mode half-bridge connected with described battery cell be connected; In described the 2nd kind of battery strings equalizing circuit the port Port 1 of n+1 winding transformer to port Port n separately the current mode half-bridge connected with described battery cell be connected, the port Port n+1 current mode half-bridge connected with described battery strings with is connected.Each port of multi winding transformer connects current mode half-bridge, be connected with each square-wave voltage source of 1/2 pulsewidth that has phase difference equivalently, the leakage inductance of multi winding transformer is the element of transmitted power, power is delivered to from the leading port of square-wave voltage phase place the port that square-wave voltage lags behind, and by phase shifting control, can realize power mutually flowing between the each port of multi winding transformer.
With reference to figure 3, the current mode half-bridge of any two ports of multi winding transformer is equivalent to two half-bridge bidirectional DC-DC converters, by controlling the leading of two half-bridge brachium pontis and lagging behind, realizes the two-way flow of power.Switching tube S
1, S
2junction capacitance Cs
1, Cs
2with switching tube S
3, S
4junction capacitance Cs
3, Cs
4form resonant circuit with transformer leakage inductance Ls1+Ls2 respectively, realize switching tube S
1, S
2, S
3, S
4zVS open-minded.
With reference to figure 4, described the 1st kind of battery strings equalizing circuit, with the square-wave signal V of 1/2 pulsewidth
gbas with reference to signal, take switch periods as adopting the voltage V of the each battery cell of periodic sampling
b1, V
b2... V
bn, ask its average voltage
each battery cell voltage V
biwith average voltage V
bavcompare, for voltage V
bibe greater than average voltage V
bavbattery cell, use than reference signal V
gbthe square-wave signal V of leading phase φ
githe current mode half-bridge brachium pontis of this battery cell of control connection; For voltage V
biequal average voltage V
bavbattery cell, use reference signal V
gbthe current mode half-bridge brachium pontis of this battery cell of control connection; For voltage V
bibe less than average voltage V
bavbattery cell, use than reference signal V
gbthe square-wave signal V of lagging phase φ
githe current mode half-bridge brachium pontis of this battery cell of control connection.Described the 2nd kind of battery strings equalizing circuit, uses reference signal V
gbthe current mode half-bridge brachium pontis of control connection battery strings, the generation principle of current mode half-bridge brachium pontis control signal that connects each battery cell is identical with described the 1st kind of battery equalizing circuit.
According to the analysis of Fig. 4, in described the 1st kind of battery strings equalizing circuit, the battery cell that is greater than battery strings average voltage for voltage adopts leading-bridge, the battery cell that is less than battery strings average voltage for voltage adopts lagging leg, the battery cell that power is greater than average voltage from voltage flows to the battery cell that voltage is less than battery strings average voltage, the energy of realizing battery cell-battery cell shifts, after several switch periods, the average voltage of the voltage trend battery strings of each battery cell, with reference to figure 5a.
In described the 2nd kind of battery strings balancing battery, the battery cell that is greater than battery strings average voltage for voltage adopts leading-bridge, the battery cell that is less than battery strings average voltage for voltage adopts lagging leg, for the current mode half-bridge that connects battery strings, adopt with reference to brachium pontis, the battery cell that power is greater than battery strings average voltage from voltage flows to the battery cell that battery strings and voltage are less than battery strings average voltage, power flows to from battery strings the battery cell that voltage is less than battery strings average voltage simultaneously, realize battery cell-battery cell, battery cell-battery strings, the energy of battery strings-battery cell shifts, after several switch periods, the average voltage of the voltage trend battery strings of each battery cell, with reference to figure 5b.
Claims (8)
1. half-bridge ZVS battery strings equalizing circuit, is characterized in that: comprise n current mode half-bridge and n winding transformer; Each current mode half-bridge is connected with a battery cell separately, and all battery cells are connected in series formation battery strings, and the number of battery cell is n; Each winding of n winding transformer is connected with a described current mode half-bridge separately; N is more than or equal to 2.
2. half-bridge ZVS battery strings equalizing circuit according to claim 1, it is characterized in that: also comprise n+1 current mode half-bridge and n+1 winding, described n+1 current mode half-bridge is connected with the two ends of described battery strings, and n+1 winding is connected with described n+1 current mode half-bridge.
3. half-bridge ZVS battery strings equalizing circuit according to claim 1 and 2, is characterized in that: each current mode half-bridge is by the first switching tube (S1), second switch pipe (S
2), the first diode (D
1), the second diode (D
2), the first electric capacity (C
1), the second electric capacity (C
2) and inductance (L
dc) composition; Wherein, the first diode (D
1) and the second diode (D
2) distinguish inverse parallel at the first switching tube (S
1) and second switch pipe (S
2) upper, the first switching tube (S
1) source electrode and second switch pipe (S
2) drain electrode be connected; The first electric capacity (C
1) negative electrode and the second electric capacity (C
2) anode be connected, the first electric capacity (C
1) anode and the first switching tube (S
1) drain electrode be connected, the second electric capacity (C
2) negative electrode and second switch pipe (S
2) source electrode be connected; Inductance (L
dc) one end and the first switching tube (S
1) source electrode be connected, the other end and second switch pipe (S
2) source electrode form a port of current mode half-bridge; The first switching tube (S
1) source electrode and the first electric capacity (C
1) negative electrode form another port of current mode half-bridge.
4. half-bridge ZVS battery strings equalizing circuit according to claim 1, is characterized in that: the component parameters of n current mode half-bridge is identical.
5. half-bridge ZVS battery strings equalizing circuit according to claim 2, is characterized in that: the component parameters that connects the current mode half-bridge that the component parameters reduction of n+1 current mode half-bridge of described battery strings connects with each battery cell to the component parameters of each described battery cell rear flank is identical.
6. half-bridge ZVS battery strings equalizing circuit according to claim 1, is characterized in that: the number of turn of each winding of n winding transformer is identical with leakage inductance.
7. half-bridge ZVS battery strings equalizing circuit according to claim 2, is characterized in that: the number of turn of described n+1 winding and leakage inductance be the number of turn of winding of each described battery cell side and the n of leakage inductance doubly.
8. half-bridge ZVS battery strings equalizing circuit according to claim 1 and 2, it is characterized in that: the leakage inductance of the winding that in each current mode half-bridge, the junction capacitance of switching tube is connected with this current mode half-bridge forms resonant circuit, and the ZVS that realizes each switching tube in this current mode half-bridge is open-minded.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320718761.1U CN203589784U (en) | 2013-11-13 | 2013-11-13 | Half-bridge ZVS battery string equalization circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320718761.1U CN203589784U (en) | 2013-11-13 | 2013-11-13 | Half-bridge ZVS battery string equalization circuit |
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| Publication Number | Publication Date |
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| CN203589784U true CN203589784U (en) | 2014-05-07 |
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|---|---|---|---|
| CN201320718761.1U Expired - Fee Related CN203589784U (en) | 2013-11-13 | 2013-11-13 | Half-bridge ZVS battery string equalization circuit |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103633691A (en) * | 2013-11-13 | 2014-03-12 | 华南理工大学 | Half-bridge ZVS (Zero Voltage Switching) battery string equalization circuit and control method thereof |
| CN110380493A (en) * | 2019-08-29 | 2019-10-25 | 西南交通大学 | A kind of serial lithium battery equalizer circuit |
-
2013
- 2013-11-13 CN CN201320718761.1U patent/CN203589784U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103633691A (en) * | 2013-11-13 | 2014-03-12 | 华南理工大学 | Half-bridge ZVS (Zero Voltage Switching) battery string equalization circuit and control method thereof |
| CN110380493A (en) * | 2019-08-29 | 2019-10-25 | 西南交通大学 | A kind of serial lithium battery equalizer circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140507 Termination date: 20171113 |