JP5815010B2 - Balancing circuit for battery unit balancing - Google Patents

Description

  The present invention relates to battery balancing, and in particular, provides a plurality of battery units with energy of a relatively high voltage among a plurality of battery units, thereby balancing the plurality of battery units. The present invention relates to an active balancing circuit.

  Generally, in order to supply a relatively high output voltage, a plurality of batteries can be connected in series to form a power supply device that can provide the required output voltage. However, when charging a power supply device having a plurality of batteries connected in series with each other, a voltage drop between the plurality of batteries may cause a total energy drop or power supply. Damage to the device can result. For example, when some batteries of the power supply device are almost fully charged and other batteries still take time to complete charging, if the power supply device is continuously charged, The phenomenon of overcharging can be formed, thereby shortening the life of the some batteries.

  Traditional power supplies use a passive battery balancing mechanism to prevent the above situation from occurring. However, the passive battery balancing mechanism consumes excess energy (ie, overcharged energy), generating energy waste and excessive heat. Accordingly, it is necessary to solve the above-mentioned problem by a kind of active battery balancing circuit.

  In view of the above, one of the objects of the present invention is to provide the plurality of battery units with the energy of a battery unit having a relatively high voltage among a plurality of battery units. An object of the present invention is to solve the above-mentioned problems by providing an active battery balancing circuit that balances units.

  According to an embodiment of the invention, it presents a balancing circuit for balancing a plurality of battery units. The balancing circuit includes a control unit, an inductor unit, and an energy transfer unit. The control unit is connected to at least one battery unit of the plurality of battery units, and the control unit includes at least one switch element. The inductor unit is connected between the switch element and the inductor unit, and removes surplus energy of the battery unit and generates inductive energy corresponding to the surplus energy based on the open / close state of the switch element To do. The energy transfer unit is connected to the inductor unit and provides the inductive energy to the plurality of battery units and stores the inductive energy.

  The battery balancing circuit provided by the present invention quickly balances the battery system and has a modular circuit structure (for example, a flyback converter circuit with high energy conversion efficiency), thereby simplifying circuit design and designing. By increasing the degree of freedom and using a self-propelled oscillator, the control mechanism can be simplified and the manufacturing cost can be reduced.

It is a display figure of the Example of the battery system of this invention. FIG. 2 is a display diagram of a first specific example of the battery system shown in FIG. 1. FIG. 3 is a display diagram of an embodiment of a local circuit of the balancing circuit shown in FIG. 2. FIG. 4 is a display diagram of a second specific example of the battery system shown in FIG. 1. FIG. 4 is a display diagram of a third specific example of the battery system shown in FIG. 1.

  In the specification and in the claims that follow, a vocabulary is used to indicate a particular element. The manufacturer can refer to the same element using different nouns so that it can be understood by those who have ordinary knowledge in the domain. In the present specification and the subsequent claims, the principle is not to distinguish the elements by the difference in names but to distinguish by the functional differences of the elements. Throughout the specification and the following claims, the term “inclusion” as used is an open term and should be interpreted as “including but not limited to”. In addition, the term “connection” includes any direct or indirect electrical connection means. Thus, if the statement states that the first device is connected to the second device, the first device is directly electrically connected to the second device, or another device or connection. It is electrically connected to the second device indirectly through the means.

Please refer to FIG. It is a display diagram of one embodiment of the battery system of the present invention. The battery system 100 includes a plurality of battery units VB _{1 to} VB _n (n is a positive integer) and a balancing circuit 102 for balancing the plurality of battery units VB _{1 to} VB _n . The plurality of battery units VB _{1 to} VB _n are connected to an external electronic device (for example, one high-side terminal) and a terminal BAT- (for example, one low-side terminal). (Not shown in FIG. 1) provides the required power, or receives charging power via terminals BAT + and BAT−. When the battery system 100 is in a charging, discharging, or idle situation, the balancing circuit 102 may use a relatively high voltage (ie, comparison) among the plurality of battery units VB ₁ -VB _n. The energy of the battery unit having a large number of charges) and providing it to all the plurality of battery units VB _{1 to} VB _n , thereby realizing the purpose of battery balancing, in other words, the balancing circuit 102 By providing an active balancing circuit and providing energy directly to all the battery units VB _{1 to} VB _n , a speedy and highly efficient battery balancing mechanism is realized.

Specifically, the balancing circuit 102 includes (but is not limited to) a control unit 112, an inductor unit 122, and an energy transfer unit 132. Among them, the control unit 112 includes, connected to the plurality of battery units VB ₁ through Vb _n, and a plurality of switching elements SW ₁ to SW _n. Among them, the plurality of switching elements SW ₁ to SW _n, are respectively installed so as to correspond to the plurality of battery units VB ₁ ~VB _n (i.e., one of the switch elements corresponds to one of the battery units). For the switch element SW ₁ and the corresponding battery unit VB ₁ , the inductor unit 122 is connected between them. Similarly, with respect to the switch element SW ₂ / SW _n and the battery unit VB ₂ / VB _n corresponding to each, the inductor unit 122 is connected between the two. The plurality of switch elements SW _{1 to} SW _n respectively control the direction of the magnetic flux of the inductor unit 122, and thereby the plurality of battery units VB _{1 to} VB _n and the switching units SW _{1 to} SW _n are opened and closed. Energy transfer between the inductor units 122 is controlled.

For example, in the situation where the voltage of the battery unit VB ₁ is excessively high (for example, when the set voltage range of the rated voltage is exceeded or the difference between the voltages of other battery units is excessive), the inductor The unit 122 removes excess energy EO from the battery unit VB ₁ and generates inductive energy EI corresponding to the excess energy EO according to the open / close state of the switch element SW ₁ . The inductive energy EI is provided to the plurality of battery units VB _{1 to} VB _n via the energy transfer unit 132 (connected to the inductor unit 122). In one embodiment, the energy transfer unit 132 can transmit the inductive energy EI to the terminal BAT +, thereby performing voltage balancing for the plurality of battery units VB _{1 to} VB _n . In another embodiment, the energy transfer unit 132 is connected between the terminals BAT + and BAT−, and provides the inductive energy EI to the plurality of battery units VB _{1 to} VB _n .

In this embodiment, the inductor unit 122 can store the generated induced energy EI and transmits the induced energy EI to the energy transfer unit 132 based on the open / closed state of the switch element. The energy transfer unit 132 may have a filtering element (not shown in FIG. 1), which reduces or eliminates ripple. In addition, the energy transfer unit 132 stores the inductive energy EI to maintain a stable energy supply, and adjusts the inductive energy EI according to actual needs to provide to the plurality of battery units VB _{1 to} VB _n . To do.

In a design change, the control unit 112 is connected to only one of the plurality of battery units VB _{1 to} VB _n . For example, the switch element included in the control unit 112 is only the switch element SW _1. Thus, the inductor unit 122 is slightly connected between the switch element SW ₁ and the battery unit VB ₁ . That is, the battery balancing mechanism provided by the present invention also provides voltage monitoring and adjustment for a single battery unit, and provides the surplus energy of the single battery to all battery units. Can be used. The points to note are as follows. Each of the plurality of battery units VB _{1 to} VB _n includes a battery cell (single battery) and a battery block (battery blocks connected in parallel to each other). A battery module (including a plurality of battery blocks connected in series with each other) or a battery pack (including a plurality of cells connected in series and in parallel). obtain.

As can be seen from FIG. 1, each one battery unit is connected to a corresponding switch element. Therefore, the balancing circuit 102 can be implemented using a modularization scheme. Please refer to FIG. It is a display diagram of a first embodiment of the battery system 100 shown in FIG. In this embodiment, the battery system 200 includes a plurality of battery units BM _{1 to} BM _n and a balancing circuit 202. Among them, each of the plurality of battery units BM1 to BMn is a plurality of battery modules, and the balancing circuit 202 realizes a modular structure by adopting the design of a flyback converter. However, as will be appreciated by those skilled in the art, the plurality of battery units BM _{1 to} BM _n are not limited to the structure of the battery module, and the balancing circuit 202 has the structure of a flyback converter. It is not limited.

Similarly, the plurality of battery units BM _{1 to} BM _n are connected in series between the terminal BAT + and the terminal BAT−, thereby providing power or charging through the terminal BAT + and the terminal BAT−. Receive power. Balancing circuit 202 includes a control unit 212, which includes a plurality of switching elements Q ₁ to Q _n. Among them, the plurality of switching elements Q _{1 to} Q _n are implemented by a plurality of transistors each having a plurality of body diodes BD _{1 to} BD _n . For example, but not limited to this, at least _{one of the} plurality of switching elements Q _{1 to} Q _n may be implemented by a MOSFET (metal-oxide-semiconductor field-effect transistor). The balancing circuit 202 also includes an inductor unit 222 and an energy transfer unit 232, of which the inductor unit 222 includes a primary side and a secondary side, and the primary side includes a plurality of _first windings LP ₁ -LP. _n , the secondary side includes a plurality of second windings LS _{1 to} LS _n , and the energy transfer unit 232 includes a plurality of diodes ED _{1 to} ED _n and a plurality of capacitors C _{1 to} C _n . In this embodiment, the control unit 212 is used to implement the control unit 112 shown in FIG. 1, the inductor unit 222 is used to implement the inductor unit 122 shown in FIG. 1, and the energy transfer unit. 232 is used to implement the energy transfer unit 132 shown in FIG.

As can be seen from FIG. 2, each first winding of the inductor unit 222 is connected between the corresponding switch element and the corresponding battery unit, and each second winding is connected to the corresponding first winding, The diodes ED _{1 to} ED _n are respectively connected to a plurality of second windings LS _{1 to} LS _n , of which two ends of each diode are respectively connected to corresponding second capacitors and corresponding second windings (that is, each A diode is connected between a corresponding capacitor and a corresponding second winding), and two ends of each capacitor are connected to a corresponding diode and a corresponding second winding (ie, each capacitor is a corresponding diode) And the corresponding second shoreline). More specifically, each one battery unit can be regarded as a circuit module having a flyback converter circuit structure. Taking the battery unit BM ₁ as an example, it is connected to a flyback converter circuit structure comprising a switching element Q ₁ , a first winding line LP ₁ , a second winding line LS ₁ , a diode ED ₁ and a capacitor C ₁ .

In addition, the energy transfer unit 232 may also include an impedance element (referred to as a resistor R in this embodiment) and a diode D. Among them, the resistor R and the diode D are respectively connected between the terminal BAT + and the terminal BAT−, whereby the energy transfer unit 232 is electrically connected to the terminal BAT + via the resistor R / diode D. In other words, the inductive energy EI is provided to the plurality of battery units BM _{1 to} BM _n through a transmission path constituted by the resistor R and the diode D. One good point of this is preferable when the plurality of capacitors C _{1 to} C _n included in the energy transfer unit 232 are all precharged via the resistor R (or impedance element) and the balancing circuit 202 operates. That is, it is possible to prevent the generation of a surge current, that is, there is no need to consider removing or reducing the surge current by providing a soft start mechanism, thereby reducing the circuit design. It can be simplified and the manufacturing cost can be reduced. Furthermore, precharging the plurality of capacitors C _{1 to} C _n can increase the circuit operation speed.

When diode D is conducting, terminal BAT + and terminal N + are considered equipotential, and a plurality of capacitors C ₁ -C _n are connected in parallel between terminal BAT + and terminal BAT−, and thus a plurality of capacitors C ₁ -C _n is considered to be connected in parallel between terminals BAT + and the terminal BAT-. Accordingly, the energy stored in each capacitor (that is, the energy stored in the energy transfer unit 232) can be distributed to each other and provided to all battery units.

  The points to note are as follows. The foregoing is only provided for illustrative purposes and is not intended to limit the present invention. In a design change, the resistor R and the diode D are connected between the terminal BAT + and the terminal N−, respectively. During another design change, at least one of the resistor R and the diode D may be omitted. In addition, the above-described impedance element (for example, resistor R) and diode (for example, diode D) can be installed in the battery system 100 shown in FIG. 1 to improve the performance of the battery balancing mechanism.

Consider the situation of excessive voltage of the battery unit BM ₁ (for example, the set voltage range of the rated voltage is exceeded, or the difference between the voltages of other battery units is excessive). When the switch element is switched from the disconnected state to the conductive state, the surplus energy EO of the battery unit BM ₁ is converted into the induced energy EI and stored in the first winding LP ₁ . Subsequently, when the switching element Q ₁ is disconnected again, the induced energy EI is coupled to the energy transfer unit 232 (for example, a plurality of capacitors C ₁ to C ₁₎ by a coupling action between the first winding line LP ₁ and the second winding line LS _1. C _n ), and through a transmission path formed by the resistor R and the diode D, is sent to the plurality of battery units BM _{1 to} BM _n . Those skilled in the operation of the flyback converter can easily understand the principle and details of the above-described energy conversion / transmission, and hence further explanation is omitted.

  As can be seen from the above, surplus energy is transferred to the energy transfer unit by switching the open / close state of the switch element corresponding to the battery unit having an excessively high voltage. Provided. Thus, not only the surplus energy of a single battery unit is provided to all battery units, but also the battery balancing mechanism provided by the present invention also provides surplus energy of multiple battery units to all battery units. it can.

The switching of the open / close state of the switch element is controlled by a control circuit. Please refer to FIG. 3 together with FIG. FIG. 3 is a display diagram of an embodiment of a local circuit of the balancing circuit 202 shown in FIG. In this embodiment, the balancing circuit 202 includes a control circuit 242, which is used to control the operation of the flyback converter circuit battery unit BM _X generates a drive signal S _G is connected. Among them, the battery unit BM _X indicates one of the plurality of battery units BM _{1 to} BM _n (that is, the index value x is a positive integer of 1 to n), and the switch element Q _X (body diode BD). _X )), the first winding line LP _X , the second winding line LS _X , the diode ED _X , and the capacitor C _X are the flyback converter circuit elements corresponding to each other. The points to note are as follows. The control circuit 242 includes a logic circuit 244, a free-running oscillator 246, and a gate drive circuit 248. The free-running oscillator 246 is self-triggerable, so the control circuit 242 has the advantages of simplified circuit design and low manufacturing cost. More specifically, the logic circuit 244 obtains the voltage information by detecting the voltages of the battery unit BM ₁ to Bm _n, as well as generating an enable signal S _EN on the basis of the voltage information. The gate drive circuit 248 generates a drive signal S _G based on the enable signal S _EN and the oscillation signal S _O generated by the free-running oscillator 246 to control the open / close state of the switch element Q _X.

For example, the enable signal S _EN the imbalance of the battery generated by detecting between the logic circuit 244 are a plurality of battery units BM ₁ to Bm _n may have certain voltage level (e.g., high voltage level). In addition, the gate drive circuit 248 generates a drive signal S _G based on the oscillation signal S _{O. In} other words, the drive signal S _G has information on the frequency and duty cycle of the oscillation signal S _O , Thus, the magnitude of the energy battery unit BM _X is released or received can be controlled by the frequency and duty cycle of the oscillation signal S _O.

The points to note are as follows. The circuit structure of the control circuit 242 shown in FIG. 3 is provided only for the purpose of explanation and is not intended to limit the present invention. In a design change, the free-running oscillator 246 also outputs the oscillation signal S _O based on the direct enable signal S _EN to become the drive signal S _G. In another design variation, the gate drive circuit 248 also generates a drive signal S _G based on direct enable signal S _EN.

Please refer to FIG. 2 again. The balancing circuit 202 can be applied to a high voltage (for example, 400V or more) or low voltage (for example, 20V) battery system. When the balancing circuit 202 is applied to a high voltage battery system, normal operation of the battery system can be maintained if the voltage resistance of the circuit elements of the balancing circuit 202 is slightly increased. In addition, if the number of energy adjustment circuits is increased, it is not necessary to increase the voltage resistance of the circuit elements of the balancing circuit 202, and the normal operation of the battery system can be maintained. Please refer to FIG. It is a display diagram of the second embodiment of the battery system 100 shown in FIG. The structure of the balancing circuit 402 included in the battery system 400 is based on the structure of the balancing circuit 202 shown in FIG. 2, and the main difference between the two is that the balancing circuit 402 is separated from at least one energy adjustment circuit 442 _n. It is to include. The energy adjustment circuit 442 _n is connected to the plurality of capacitors C _{1 to} C _n and selectively adjusts the induced energy EI stored in the plurality of capacitors C _{1 to} C _n , and the plurality of adjusted induced energy EI Are used to provide the battery units SBM _{1 to} SBM _n .

In this embodiment, when the induced energy EI is relatively low (for example, not exceeding 48V), the energy adjustment circuit 442 _n does not adjust the induced energy EI. In other words, the battery balancing mechanism of the balancing circuit 402 and the battery balancing mechanism of the balancing circuit 202 shown in FIG. 2 are substantially the same or similar. When the balancing circuit 402 is applied to a high voltage battery system (ie, the rated voltage of the plurality of battery units SBM _{1 to} SBM _n is a high voltage), the inductive energy EI can be relatively high (eg, 48V Thus, the energy adjustment circuit 442 _n is used to perform boost conversion on the induced energy EI (ie, the energy adjustment circuit 442 _n can be a boost converter circuit), and a plurality of The battery units SBM _{1 to} SBM _n are provided to maintain the normal operation of the battery system.

In practice, the energy adjustment circuit 442 _n may have a first terminal NA, a second terminal NB, a third terminal NC, and a fourth terminal ND. Among them, the first terminal NA and the second terminal NB are respectively connected to two ends of the capacitor C _n , and the third terminal NC and the fourth terminal ND are respectively the terminal BAT + (that is, the high voltage side) and the terminal BAT− (that is, the low voltage). As a result, the energy adjustment circuit 442n receives the induction energy EI via the first terminal NA and the second terminal NB, and the adjusted induction energy EI via the third terminal NC and the fourth terminal ND. Can be output.

In addition, the energy adjustment circuit 442 _n may include a logic unit 446 _n and an adjustment unit 448 _n . The logic unit 446 _n is used to determine whether or not the induced energy EI stored in the plurality of capacitors C _{1 to} C _n has reached a predetermined energy value and generate a determination result DR. The adjustment unit 448 _n is connected to the logic unit 446 _n and is used to adjust the induced energy EI according to the determination result DR. For example, the logic unit 446 _n employs a determination threshold voltage threshold value having hysteresis, whereby the determination result DR and the induced energy EI are outside the hysteresis band. When this is indicated, the adjustment unit 448 _n adjusts the induced energy EI.

Balancing circuit 402 may also include a free-running oscillator 452. It generates the oscillation signal S _C to control the energy adjustment operation of the energy adjustment circuit 442 _n . For example, in situations where energy conditioning circuit 442 _n is a boost converter circuit, the energy conditioning circuit 442 _n based on the frequency and duty cycle of the oscillation signal S _C, to adjust the amount of increase in inductive energy EI. In addition, by adopting the design concept of the control circuit 242 shown in FIG. 3, a control circuit (not shown in FIG. 4) corresponding to the energy adjustment circuit 442 _n can be implemented.

The points to note are as follows. Balancing circuit 402 may also include a plurality of energy conditioning circuits, thereby implementing the concept of modular circuit design. In the embodiment shown in FIG. 4, the plurality of capacitors C ₁ -C _n are respectively connected to a plurality of energy adjusting circuits 442 ₁ ~442 _n, of which, a plurality of energy adjusting circuits 442 ₁ ~442 _n, actual design used by the need, as well as each includes a plurality of logic units 446 ₁ ~446 _n and a plurality of adjustment units 448 ₁ ~448 _n. In this embodiment, slightly one of a plurality of energy adjusting circuits 442 ₁ ~442 _n (e.g., the energy conditioning circuit 442 _n) using has realized boost converter operation mentioned above, of which not used The energy adjustment circuit is indicated by a dotted line. In another embodiment, only a single energy conditioning circuit (eg, energy conditioning circuit 442 _n ) can be installed in balancing circuit 402.

Please refer to FIG. It is a display diagram of the third embodiment of the battery system 100 shown in FIG. The structure of the balancing circuit 502 included in the battery system 500 is based on the structure of the battery system 200 shown in FIG. 2, and the main difference between the two is the number of windings included in the inductor unit and the connection method. . The battery system 500 includes a plurality of battery units BP _{1 to} BP _n (for example, a plurality of battery blocks), a control unit 512, an inductor unit 522, and an energy transfer unit 532. The control unit 512 includes a plurality of switch elements Q _{1 to} Q _n shown in FIG. The inductor unit 522 includes a primary side and a secondary side, and the primary side includes a plurality of _first windings LP _{1 to} LP _n , and the secondary side includes one second winding LS. The second shore line LS is coupled to a plurality of _first shore lines LP _{1 to} LP _n . The energy transfer unit 532 includes a diode ED and a capacitor C, of which the diode ED is connected to the second winding LS, and the capacitor C is connected to the diode ED and the second winding LS. In this embodiment, two ends of the diode ED are connected to the capacitor C and the second feeder LS, respectively (ie, the diode ED is connected between the capacitor C and the second feeder LS), and the two ends of the capacitor C are respectively The diode ED is connected to the second feeder LS (that is, the capacitor C is connected between the diode ED and the second feeder LS).

Similarly, by switching the open / close state of the switch element corresponding to the battery unit having an excessively high voltage, surplus energy is transferred to the energy transfer unit, which can be provided to all battery units. it can. In addition, it controls the opening and closing operation of a plurality of switching elements Q ₁ to Q _n by the control circuit 242 shown in FIG.

  In this embodiment, the energy transfer unit 532 separately includes a diode D shown in FIG. If you are familiar with this technique, after reading the description of FIG. 2, the capacitor C is connected between the terminal BAT + and the terminal BAT− by the impedance element (for example, the resistor R shown in FIG. 2) and / or the diode D. The impedance element, the diode D, and the capacitor C are electrically connected. Therefore, the arrangement and function of the battery system 500 are not redundantly described here.

The points to note are as follows. The plurality of _first windings LP _{1 to} LP _n are coupled to each other, so that when the voltage difference between the battery units is excessive, an overcurrent may be generated between the battery units. For example, excess energy EO removed by the first winding LP ₁ can be coupled to the first winding LP _{2 and} when the voltage of the battery unit BP ₁ is much higher than the voltage of the battery unit BP ₂ , The battery system 500 may be damaged by flowing into the switch element Q ₁ from the terminal N. Thereby, the control unit 512 may also include a plurality of diodes D _{1 to} D _n , which are respectively connected between the plurality of switch elements Q _{1 to} Q _n and the plurality of battery units BP _{1 to} BP _n. Used to prevent or interrupt overcurrent.

In one design variation, also the plurality of diodes D ₁ to D _n, may each connected between the plurality of first winding LP ₁ ~LP _n and a plurality of battery unit BP ₁ to BP _n. In another design variation, a plurality of diodes D ₁ to D _n may be respectively connected between the plurality of switching elements Q ₁ to Q _n and a plurality of first winding LP ₁ ~LP _n. Briefly, overcurrent can be prevented or interrupted by implementing the switch element included in the control unit by a unidirectional switch element. Those skilled in the art can easily understand the details of operation of the battery system 500 shown in FIG. 5 and, therefore, further description is omitted here.

  The points to note are as follows. The structure of the unidirectional switch element described above is applicable during the battery balancing mechanism shown in FIG. 1 or FIG. 2 or FIG. 4, ie, the control unit 112/212 also includes at least one diode. And thereby a unidirectional switch element can be implemented. In addition, the battery balancing mechanism shown in FIGS. 1, 2, 4, and 5 also provides voltage monitoring and adjustment for just a single battery unit to transfer excess energy of the single battery to all battery units. Can be used to provide

  Overall, the battery balancing circuit provided by the present invention quickly balances the battery system and has a modular circuit structure (for example, a flyback converter circuit with high energy conversion efficiency), thereby simplifying circuit design. The design freedom is increased, and the control mechanism can be simplified and the manufacturing cost can be reduced by adopting the self-propelled oscillator.

  What has been described above are only preferred embodiments of the present invention, and all equivalent changes and modifications that can be made based on the claims of the present invention should fall within the scope of the present invention. .

100, 200, 400, 500 Battery system 102, 202, 402, 502 Balancing circuit 112, 212, 512 Control unit 122, 222, 522 Inductor unit 132, 232, 532 Energy transfer unit 242 Control circuit 244 Logic circuit 246, 452 Running oscillator 248 Gate drive circuit 442 _{1 to} 442 _n Energy adjustment circuit 446 _{1 to} 446 _n Logic unit 448 _{1 to} 448 _n Adjustment unit BAT +, BAT−, N +, N−, NA, NB, NC, ND, N terminal VB _{1 ~VB n, BM 1 ~BM n} , BM X, SBM 1 ~SBM n, BP 1 ~BP n battery unit _{SW 1 ~SW n, Q 1 ~Q} n, Q X switch element LP ₁ ~LP _n, LP _{X, LS 1 ~LS n, LS} X, LS winding B _{1 ~BD n} body diode _{D, ED 1 ~ED n, ED} X, ED, D 1 ~D n diode _{C 1 ~C n, C X,} C capacitor R resistor

Claims (8)

In a balancing circuit for balancing multiple battery units,
A control unit that is connected to at least one of the plurality of battery units and includes at least one switch element;
An inductor unit, connected between the switch element and the battery unit, removes excess energy of the battery unit based on the open / closed state of the switch element, and generates inductive energy corresponding to the excess energy. The inductor unit generated,
An energy transfer unit, connected to the inductor unit, providing the inductive energy to the plurality of battery units, and storing the inductive energy;
An energy adjustment circuit, connected to a capacitor of the energy transfer unit, for selectively adjusting the inductive energy, and providing the adjusted inductive energy to the plurality of battery units;
Including
The energy adjustment circuit includes:
A logic unit that determines whether the inductive energy stored in the capacitor has reached a predetermined energy value and generates a determination result;
An adjustment unit, connected to the logic unit, adjusts the induced energy based on the determination result, and when the determination result indicates that the induced energy is greater than the predetermined energy value , the adjustment unit When the boost conversion is performed on the energy , and the determination result indicates that the induced energy is smaller than the predetermined energy value, the adjustment unit does not adjust the induced energy and directly provides the induced energy to the plurality of battery units. to, the adjustment unit,
The balancing circuit characterized by including the above. The balancing circuit according to claim 1, wherein the inductor unit includes:
A primary side including the first winding connected to the switch element;
A secondary side comprising the second winding coupled to the first winding, and the secondary side;
The first shoreline stores the surplus energy based on the open / closed state of the switch element to form the induced energy, and the induced energy is transmitted to the energy transfer unit via the second shoreline. A balancing circuit characterized by being sent. 3. The balancing circuit according to claim 2, wherein the control unit also includes
At least one diode, the at least one diode being connected between the switch element and the battery unit, between the first feeder and the battery unit, or between the switch element and the first feeder. ,
A balancing circuit comprising: 3. The balancing circuit according to claim 2, wherein the energy transfer unit is
A diode connected to the second wire, and
A capacitor connected to the diode and the second winding, the diode connected between the capacitor and the second winding, and the capacitor connected between the diode and the second winding; Capacitors,
A balancing circuit comprising:   2. The balancing circuit according to claim 1, wherein the plurality of battery units are connected in series with each other between a high voltage side and a low voltage side, and the capacitor is connected between the high voltage side and the low voltage side. A balancing circuit characterized by that.   The balancing circuit according to claim 1, wherein the plurality of battery units are connected in series with each other between a high voltage side and a low voltage side, and the energy adjustment circuit includes a first terminal, a second terminal, a third terminal, And the fourth terminal, the first terminal and the second terminal are respectively connected to two ends of the capacitor, and the third terminal and the fourth terminal are respectively connected to the high voltage side and the low voltage side. A balancing circuit characterized by that.   The balancing circuit according to claim 1, wherein the energy adjustment circuit is a step-up conversion circuit. The balancing circuit according to claim 1, wherein the energy adjustment circuit includes:
A self-running oscillator that controls an energy adjustment operation of the energy adjustment circuit by generating an oscillation signal;
A balancing circuit comprising:

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