JP2015100217A - Balancing circuit for balancing battery units - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a balancing circuit for balancing battery units.SOLUTION: A balancing circuit for balancing a plurality of battery units includes a plurality of balancing modules. Each balancing module includes first and second switch units and first and second inductor devices. The first inductor device is coupled to the second inductor device. The plurality of balancing modules include first and second balancing modules, and they are respectively connected to first and second battery units of the plurality of battery units. The first inductor device of the first balancing module removes excess energy of the first battery unit by opening and closing of the first switch unit of the first balancing module, and stores inductive energy corresponding to the excess energy in the second balancing module.

Description

  The present invention relates to a kind of battery balancing, and in particular, by providing the plurality of battery units with energy of a battery unit having a relatively high voltage among a plurality of battery units. The present invention relates to an active balancing circuit for balancing units.

  In general, in order to provide a relatively high output voltage, a plurality of batteries are connected in series to form a power supply device to provide a necessary output voltage. However, when charging a power supply device having a plurality of batteries connected in series with each other, a decrease in total energy is formed due to voltage imbalance between the plurality of batteries, or power supply Damage to the device can result. For example, when a part of the batteries in the power supply device is already saturated and the other batteries still take a long time to complete charging, if the battery is subsequently charged, An overcharging phenomenon is formed, thereby shortening the battery life of the part.

Traditional power supply devices prevent the above situation from occurring by using a passive battery balancing mechanism. However, the passive balancing mechanism consumes excess energy (i.e., overcharged energy), thus creating energy waste and excessive heat. For this reason, a kind of active balancing circuit (active
It is necessary to solve the above-mentioned problem by balancing circuit.

  In view of this, one of the objects of the present invention is to provide a plurality of battery units with a kind of energy of a battery unit having a relatively high voltage among the plurality of battery units. An active balancing circuit is provided to solve the above-described problems.

  According to one embodiment of the present invention, it presents a kind of balancing circuit for balancing a plurality of battery units. The balancing circuit includes a plurality of balancing modules. The plurality of balancing modules are connected to the plurality of battery units, respectively, and each one of the balancing modules includes a first switch unit, a second switch unit, a first inductor device, and a second inductor device. The first inductor device is connected between the first switch unit and one battery unit to which the balancing module is connected. The second inductor device is connected to the second switch unit. Among these, the first inductor device is coupled to the second inductor device. The plurality of balancing modules include a first balancing module and a second balancing module, and are connected to the first battery unit and the second battery unit of the plurality of battery units, respectively. The first inductor device of the first balancing module takes away excess energy of the first battery unit according to the open / close state of the first switch unit of the first balancing module, and corresponds to the excess energy. Inductive energy is stored in the second balancing module. The second inductor device of the second balancing module provides the inductive energy to the second battery unit according to the open / close state of the second switch unit of the second balancing module.

  The battery balancing circuit provided by the present invention quickly balances the battery system, has a modularized circuit structure, simplifies circuit design, increases design freedom, and adopts a self-propelled oscillator. And manufacturing costs can be reduced.

It is a display figure of one 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 an example display diagram of transistor switching timing shown in FIG. 2. FIG. 3 is a display diagram of a specific example 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 device using different nouns so that it can be understood by those with ordinary knowledge in the domain of affiliation. 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 provide a power source required by the external electronic device (not shown in FIG. 1) through the terminals BAT + and BAT−, or the terminals BAT + and BAT− -Receiving charging power. 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) is taken out and provided 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 is an active balancing circuit and provides a speedy and highly efficient battery balancing mechanism by providing energy directly to the required battery unit.

Specifically, the balancing circuit 102 may include (but is not limited to) a plurality of balancing modules 112 _{1 to} 112 _n that are connected to a plurality of battery units VB _{1 to} VB _n , respectively. The Each of the plurality of balancing modules 112 _{1 to} 112 _n includes a plurality of first switch units SW1 _{1 to} SW1 _n , a plurality of second switch units SW2 _{1 to} SW2 _n , a plurality of first inductor devices LP _{1 to} LP _n and a plurality of _first switches. 2 inductor devices LS _{1 to} LS _n are included. In each balancing module, the first inductor device is connected between the first switch unit and the battery unit to which the balancing module is connected, the second inductor device is connected to the second switch unit, and the first inductor of the balancing module Coupled to the device. In the following, the case where the battery unit VB ₁ has an excessively high voltage (for example, the set voltage range of the rated voltage is exceeded or the difference between the voltages of other battery units is excessive) is taken as an example, The operation method of the balancing circuit 102 will be briefly described.

First, a first inductor unit LP ₁ is the first opening and closing state of the switch unit SW1 _1, removal of the excess energy EO of the battery unit VB _1, as well as inductive energy (inductive energy) EI corresponding to the excess of energy EO, Store in at least one balancing module. By way of example (although the invention is not so limited), the surplus energy EO is coupled to each one balancing module, so that the induced energy EI is reduced to each balancing module. Saved in. In addition, the surplus energy EO may be coupled to the second inductor device LS ₁ to generate inductive energy EI, whereby the inductive energy EI is stored in each one balancing module. Subsequently, if the battery unit VB ₂ is too low, the second inductor device LS _{2 of} the second balancing module 112 ₂ provides inductive energy EI to the battery unit VB _{2 according} to the open / closed state of the second switch unit SW2 _2. To do. In brief, the battery balancing mechanism provided by the present invention releases the energy of the battery unit to which the balancing module is connected by the switch unit of the balancing module (for example, the first switch unit SW1 ₁ ) and the other. The other switch unit (for example, the second switch unit SW2 ₁ ) of one balancing module is used, and the released energy is provided to the battery unit to which the other balancing module is connected. The points to note are as follows. The battery balancing mechanism provided by the present invention can also provide the surplus energy of a single battery unit to a plurality of battery units or the surplus energy of a plurality of battery units to a single battery unit. Alternatively, excess energy of the plurality of battery units may be provided to the plurality of battery units.

In addition, each of the battery units VB _{1 to} VB _n shown in FIG. 1 includes a battery cell (single battery), a battery block (battery block) (in parallel with each other). Including a plurality of connected batteries), a battery module (including a plurality of battery blocks connected in series with each other) or a battery pack (a plurality of batteries connected in series and in parallel) Can be included). The balancing modules 112 _{1 to} 112 _{n in} FIG. 1 have the same or similar circuit structure, and therefore the balancing circuit 102 can be implemented using a modularization scheme.

Please refer to FIG. It is a display diagram of a first specific embodiment of the battery system 100 shown in FIG. In this specific embodiment, the battery system 100 includes a plurality of battery units B ₁ -B _n and a balancing circuit 202. The plurality of battery units B _{1 to} B _n are formed as a plurality of battery cells (but the present invention is not limited to this), and a terminal BAT + (that is, high side) and a terminal BAT− (that is, Connected in series between the low side. As a result, power is provided via the terminal BAT + and the terminal BAT−, or the charging power is received. The balancing circuit 202 includes a plurality of balancing modules 212 _{1 to} 212 _n , which respectively include a plurality of first inductor devices LD _{1 to} LD _n , a plurality of second inductor devices LC _{1 to} LC _n , and a plurality of first switch units. 224 _{1 to} 224 _n and a plurality of second switch units 228 _{1 to} 228 _n . Among each balancing module, the first inductor device of the balancing module is connected between the first switch unit of the balancing module and the battery unit to which the balancing module is connected, and the second inductor device of the balancing module is It is connected between the second switch unit of the balancing module and the battery unit to which the balancing module is connected.

In this specific embodiment, the plurality of first switch units 224 _{1 to} 224 _n are used to implement the plurality of first switch units SW1 _{1 to} SW1 _n shown in FIG. The switch units 224 _{1 to} 224 _n are a plurality of uni-directional switch devices, each of which includes a plurality of diodes DD _{1 to} DD _n and a plurality of two-way types ( bi-directional) switch device (i.e., a plurality of body diodes (body diode) is carried out by BD1 plurality of transistors having _{1 ~BD1 n (transistor) QD 1} ~QD n). For example (however, the present invention is not limited to this), at least one of the plurality of transistors QD _{1 to} QD _n is realized by a MOSFET (Metal Oxide Semiconductor Field Effect Transistor). Similarly, the plurality of second switch units 228 _{1 to} 228 _n are used to implement the plurality of second switch units SW2 _{1 to} SW2 _n shown in FIG. _{1 to} 228 _n may also be a plurality of unidirectional switch devices, each having a plurality of diodes DC _{1 to} DC _n and a plurality of bidirectional switch devices (ie, a plurality of body diodes) connected in series. is carried out by (body diode) BD2 plurality of transistors QC ₁ ~QC _n having _{1 ~BD2 n).}

As can be seen from FIG. 2, in addition to the first inductor device and the second inductor device in each balancing module being coupled to each other, the first inductor devices between the different balancing modules are coupled to each other and different. The second inductor devices between the balancing modules are also coupled to each other. In other words, each one inductor device (that is, the plurality of first inductor devices LD _{1 to} LD _n and the plurality of second inductor devices LC _{1 to} LC _n ) is coupled to each other, and thereby the plurality of balancing modules 212. _When one of the balancing modules _{1 to} 212 _n removes surplus energy from the battery unit to which the balancing module is connected, any of the other balancing modules can store induced energy corresponding to the surplus energy.

The voltage of the battery unit B ₁ is too high (for example, the set voltage range of the rated voltage is exceeded or the difference between the voltages of other battery units is excessive) and the voltage of the battery unit B ₂ is Consider situations that are too low (eg, below the set voltage range of the rated voltage or much lower than the voltage of other battery units). When the first switch unit 224 ₁ (or transistor QD ₁ ) is switched from a turn-off state to a turn-on state, the excess energy EO of the battery unit B ₁ is removed, and the first inductor device Due to the coupling relationship between LD ₁ and other inductor devices, excess energy EO can be converted to inductive energy EI and further stored in the other inductor devices (ie, the magnetic core of the inductor device). Subsequently, the second switch unit 228 ₂ (or transistor QC ₂ ) is switched from the disconnected state to the conductive state, and once the first switch unit 224 ₁ is switched from the conductive state to the disconnected state again, that is, the second inductor The inductive energy EI stored by the device LC ₂ can be provided to the battery unit B ₂ .

As can be seen from the above, when the voltage of the battery unit B _x (1 ≦ x ≦ n) is excessively high, the first switch unit 224 _x (or the transistor QD _x ) is turned on to generate excess energy (for example, excess energy). As well as the corresponding induced energy (eg, induced energy EI). Then, by conducting the second switching unit 228 _y (or transistor _{QC y) (1 ≦ y ≦} n), inductive energy battery unit B _y (also ie, a battery unit having a relatively low voltage) provided Is done. In other words, possible to conduct the transistor QD _x is obtained regarded as possible to discharge the battery unit B _x, thereby conducting the transistor QC _y may be considered charging execution for the battery unit B _y.

Refer to FIG. 3 for the switching timing of the switch unit shown in FIG. FIG. 3 is a display diagram of one embodiment of the switching timing of the transistors shown in FIG. Among them, the transistor QD _x represents one of the plurality of transistors QD _{1 to} QD _n (corresponding to the first switch unit 224 _x ), and the transistor QC _y is one of the plurality of transistors QC _{1 to} QC _n. (Corresponding to the second switch unit 228 _y ). As can be seen from the above, the transistor QC _y is in the conducting state (for example, the signal S (QC _y ) is at the high level), and the transistor QD _x is switched from the conducting state to the disconnected state again (for example, the signal S ( QD _x) is switched from high level to low level) when, inductive energy stored in the core may be provided in the battery unit corresponding to the transistor QC _y. Accordingly, in order to provide inductive energy to the battery unit corresponding to the transistor QC _y, the transistor QC _y is conducting at the same time the transistor QD _x is disconnected (also ie, the second switch unit 228 _y has a first switch unit 224 _x closes open at the same time) (as shown in FIG. 3), in one design variation, the transistor QC _y may also be conducted before the transistor QD _x is disconnected, for example, the transistor QC _y transistor QD _x at the same time it may be conducting.

In addition, in order to prevent saturation of energy stored in the magnetic core, the duty cycle (duty cycle) for driving the signals of the transistors QD _x and QC _y is appropriately designed so that the inductive energy stored in the magnetic core is stored. Can be released completely. For example, the conduction time (eg, TC) after transistor QD _x of transistor QC _y is disconnected may be designed to be greater than the conduction time (eg, TD) of transistor QD _x . In certain embodiments, the turn ratio between the first inductor device and the second inductor device can be designed, and the design of the duty cycle of the signal can be combined to reduce the induced energy stored in the magnetic core. Completely released.

The switching of the open / close state of the switch element is controlled by a control circuit. Please refer to FIG. 4 together with FIG. FIG. 4 is a display diagram of a specific embodiment of a local circuit of the balancing circuit 202 shown in FIG. In this particular embodiment, the balancing circuit 202 includes a control unit 242, which is used to generate the drive signal S _G and control the operation of the corresponding balancing module 212 _x by the battery unit B _X. Among them, the first inductor device LD _x , the second inductor device LC _x , the plurality of diodes DD _x and DC _x , the transistor QD _x (having the body diode BD1 _x ), and the transistor QC _y (having the body diode BD2 _x ) are: The circuit device is included in the balancing module 212 _x . The control unit 242 includes a logic circuit 244, a free-running oscillator 246, and a gate drive circuit 248. The free-running oscillator 246 is self-excited, so the control unit 242 has the advantages of simplified circuit design and low manufacturing cost. More specifically, the logic circuit 244 can detect voltage of the plurality of battery units B _{1 to} B _n to acquire voltage information, and generate an enable signal _SEN based on 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 open / close a transistor (for example, the transistor QD _x and / or the transistor QC _x ). Control.

For example, the enable signal _SEN generated when the logic circuit 244 detects voltage imbalance between the plurality of battery units B _{1 to} B _n may have a specific voltage level (eg, a 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 , As a result, the amount of energy released (or received) by the battery unit B _X can be controlled by the frequency of the oscillation signal S _O and the duty cycle.

The points to note are as follows. The foregoing is used for illustrative purposes only and is not intended to limit the present invention. In one embodiment, at least one battery unit can be energized simultaneously to release its surplus energy and stored in each balancing module, and corresponding inductive energy can be simultaneously applied to at least one battery unit that is required. provide. In addition, the circuit structure of the control unit 242 shown in FIG. 4 is merely presented for illustrative purposes. For example, the free-running oscillator 246 can also generate an oscillation signal based on the direct enable signal _SEN. S _O may be output as the drive signal S _G. During a design change, and the gate drive circuit 248, based on the direct Lee nave enable signal S _en, may generate drive signals S _G.

Please refer to FIG. It is a display diagram of a second specific embodiment of the battery system 100 shown in FIG. In this specific embodiment, the battery system 500 includes a plurality of battery units B ₁ -B _n and a balancing circuit 502 shown in FIG. The balancing circuit 502 includes a plurality of balancing modules 512 _{1 to} 512 _n , each of which includes a plurality of first inductor devices LP _{1 to} LP _n and a plurality of second inductor devices LS _{1 to} LS _n , a plurality of It includes first switch units 524 _{1 to} 524 _n , a plurality of second switch units 528 _{1 to} 528 _n , and a plurality of capacitors C _{1 to} C _n . In each balancing module, the first inductor device is connected between the first switch unit and a battery unit to which the balancing module is connected, the second inductor device is connected to the second switch unit, and Two ends of the capacitor of the balancing module are connected to the second inductor device and the second switch unit, respectively.

In this specific embodiment, the plurality of first switch units 524 _{1 to} 524 _n are each implemented by a plurality of transistors QD _{1 to} QD _n shown in FIG. 2, and the plurality of second switch units 528 _{1 to} 528 _n are respectively This is implemented by a plurality of transistors QC _{1 to} QC _n shown in FIG. In addition, the plurality of capacitors C _{1 to} C _n are connected in parallel to each other between the terminal N + and the terminal N− (that is, the terminal BAT−), whereby the capacitors C _{1 to} C _n are connected to each other in the plurality of balancing modules 512 _{1 to} 512 _n . When one balancing module removes excess energy from the battery unit to which the balancing module is connected, any other balancing module can store inductive energy corresponding to the excess energy.

The voltage of the battery unit B ₁ is too high (for example, the set voltage range of the rated voltage is exceeded or the difference between the voltages of other battery units is excessive) and the voltage of the battery unit B ₂ is Consider situations that are too low (eg, below the set voltage range of the rated voltage or much lower than the voltage of other battery units). When the transistor QD ₁ switches from the disconnected state to the conductive state, the surplus energy EO of the battery unit B ₁ is removed, and the surplus energy EO is between the first inductor device LP ₁ and the second inductor device LS ₁ . Due to the coupling relationship, it is converted to inductive energy EI, which is stored in the magnetic core, and when the transistor QD ₁ switches to a disconnected state, it is in a plurality of capacitors C _{1 to} C _n connected in parallel to each other. Saved. When the transistor QC ₂ switches from the disconnected state to the conductive state, the inductive energy EI stored in the capacitor C ₂ is determined by the battery unit B due to the coupling relationship between the first inductor device LP ₂ and the second inductor device LS _2. Offered in _two .

The inductive energy is stored in the capacitor of each balancing module, so that once the second switch unit of at least one balancing module is turned on, the energy is provided to the battery unit to which at least one balancing module is connected. . In addition, that is, the first switch unit (for example, conducting to the transistor QD _x ) and the second switch unit (for example, conducting to the transistor QC _y ) are turned on at the same time, and the above-described battery balancing operation can be realized. Briefly, during the operation period of the battery system 500, the balancing circuit 502 can perform a battery balancing operation at an arbitrary time point. In addition, the conduction of the transistor QD _x (1 ≦ x ≦ n) causes the battery unit B _x to operate. It is discharged, and the conduction of the transistor _{QC y (1 ≦ y ≦ n} ) are considered to be charged against the battery unit B _y, thereby, the circuit structure shown is balancing circuit 502, the charge mode, discharge The present invention can be applied to a battery system in a mode or an idle mode.

  Similarly, saturation of energy stored in the capacitor can be prevented by appropriately designing the duty cycle of the signal for driving the transistor and / or the turns ratio between the first inductor device and the second inductor device. In addition, the control mechanism of the switch unit of the balancing circuit 502 may employ the structure of the control unit 242 shown in FIG. 4 to control the amount of energy released (or received) by the battery unit.

Balancing circuit 502 may also include an impedance element (referred to as resistor R in this embodiment) and diode D. Among them, the resistor R and the diode D are connected between the terminal BAT + and the terminal N +, respectively, so that the plurality of capacitors C _{1 to} C _n are all precharged by the resistor R (or the impedance element), and the balancing circuit 502 is It is possible to prevent unnecessary surge current from being generated during operation, that is, it is not necessary to consider eliminating or reducing the surge current by providing a soft start mechanism, Simplify circuit design and reduce manufacturing costs. In addition, by precharging the plurality of capacitors C _{1 to} C _n , the circuit operation speed can be increased, and the installation of the diode D can eliminate or reduce the surge current.

When diode D conducts, terminal BAT + and terminal N + can be considered equipotential. Therefore, the plurality of capacitors C _{1 to} C _n can be connected in parallel between the terminal N + and the terminal BAT +. Thus, the energy stored in each capacitor can be distributed to each other, and can be provided to all the battery units, thereby increasing the battery balancing efficiency and the plurality of capacitors C _{1 to} C _n. Can be prevented from having an excessively high voltage.

The points to note are as follows. What has been described above is illustrative only and is not intended to limit the invention. During a design change, at least one of the resistor R and the diode D can be omitted. In another design change, the plurality of capacitors C ₁ -C _n can be replaced with other types of energy storage devices.

The balancing circuit provided by the present invention can be applied to a high voltage (for example, 400 V or more) or low voltage (for example, 20 V) battery system. During application in high-voltage battery systems, the withstand voltage of the circuit elements of the balancing circuit is increased, so that the normal operation of the battery system is maintained, and an energy adjustment circuit may be added (the withstand voltage of the circuit elements). Therefore, the normal operation of the battery system can be maintained. See FIG. It is a display diagram of a third embodiment of the battery system 100 shown in FIG. The structure of the balancing circuit 602 included in the battery system 100 is based on the structure of the battery system 502 shown in FIG. 5. The main difference between the two is that the balancing circuit 602 includes an energy adjustment circuit 642 separately. It is in. The energy adjustment circuit 642 is connected to the plurality of capacitors C _{1 to} C _n and selectively adjusts the induction energy EI stored in the plurality of capacitors C _{1 to} C _n, and the adjusted induction energy EI is stored in the plurality of batteries. Used to provide units B ₁ -B _n .

In this specific embodiment, when the induction energy EI is relatively low (for example, when the voltages of the plurality of capacitors C _{1 to} C _n do not exceed 180V), the energy adjustment circuit 642 does not adjust the induction energy EI. . In other words, the battery balancing mechanism of the balancing circuit 602 and the battery balancing mechanism of the balancing circuit 502 shown in FIG. 5 are substantially the same or similar. When the balancing circuit 602 is applied to a high voltage battery system (that is, the rated voltage (voltage between the terminal BAT + and the terminal BAT−) formed by connecting a plurality of battery units B _{1 to} B _n in series is high). If the induced energy EI has an excessive phenomenon (for example, exceeds 180V), the induced energy EI is boosted and converted using the energy adjustment circuit 642 (that is, the energy adjustment circuit 642 boosts the voltage). It may be a converter circuit (boost converter circuit) or a flyback converter circuit (flyback converter circuit), and provide the converted energy to a plurality of battery units B _{1 to} B _n , thereby enabling normal operation of the battery system. maintain.

In practice, the energy adjustment circuit 642 includes 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 the two ends of the capacitor C _n , and the third terminal NC and the fourth terminal ND are respectively connected to the terminal BAT + and the terminal BAT−, thereby the energy adjustment circuit. 642 can receive the induced energy EI via the first terminal NA and the second terminal NB, and can output the adjusted induced energy EI via the third terminal NC and the fourth terminal ND.

In addition, the energy adjustment circuit 642 may include a logic unit 646 and an adjustment unit 648. The logic unit 646 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. For example, the logic unit 646 employs a decision threshold voltage threshold with hysteresis, whereby the decision result indicates that the induced energy EI is outside the hysteresis band. When indicated, the adjustment unit 648 makes adjustments to the induced energy EI.

Balancing circuit 602 also includes a free-running oscillator 652, which controls the energy adjusting operation of the energy conditioning circuit 642 outputs an oscillation signal S _c. For example, in situations where the energy conditioning circuit 642 is a boost converter circuit, the energy adjustment circuit 642 based on the frequency and duty cycle of the oscillating signal S _c, adjusts the amount of increase in inductive energy EI. In addition, a control unit (not shown in FIG. 6) corresponding to the energy adjustment circuit 642 may be implemented by adopting the design concept of the control unit 242 shown in FIG.

The points to note are as follows. The balancing circuit 602 may also include a plurality of energy conditioning circuits and may also implement the concept of modular circuit design. For example, each one balancing module shown in FIG. 6 can be connected to an energy regulation circuit (not shown in FIG. 6), that is, each one of the plurality of balancing modules 512 _{1 to} 512 _n . Any of the balancing modules can be connected to a circuit device that is the same as or similar to the energy adjustment circuit 642. The points that need attention are as follows. In a situation where the balancing circuit 602 includes a plurality of energy adjustment circuits, when performing the above-described boost conversion operation, one of the plurality of energy adjustment circuits may be activated slightly.

  In summary, the battery balancing circuit provided by the present invention quickly balances the battery system and has a modular circuit structure, thereby simplifying the circuit design and increasing the degree of freedom of design, as well as the self-propelled oscillator. By adopting it, the control mechanism can be simplified and the manufacturing cost can be reduced.

  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, 500, 600 Battery system 102, 202, 502, 602 Balancing circuit 112 ₁ , 112 ₂ , 112 _n , 212 ₁ ,
212 ₂ , 212 _n , 212 _x ,
512 ₁ , 512 ₂ , 512 _n balancing modules 524 ₂ , 524 _n , 528 ₁ , 528 ₂ ,
528 _n , SW1 ₁ , SW1 ₂ ,
SW1 _n , SW2 ₁ , SW2 ₂ , SW2 _n switch unit 242 Control unit 244 Logic circuit 246, 652 Self-running oscillator 642 Energy adjustment circuit 646 Logic unit 648 Adjustment unit BAT +, BAT−, N +, N−,
NA, NB, NC, ND terminals VB ₁ , VB ₂ , VB _n ,
B ₁ , B ₂ , B _n , B _X battery units QD ₁ , QD ₂ , QD _n , QD _x ,
QC ₁ , QC ₂ , QC _n , QC _x transistors LP ₁ , LP ₂ , LP _n ,
LD ₁ , LD ₂ , LD _n , LD _x ,
LS ₁ , LS ₂ , LS _n ,
LC ₁ , LC ₂ , LC _n , LC _x inductor device BD1 ₁ , BD1 ₂ , BD1 _n ,
BD1 _x , BD2 ₁ , BD2 ₂ ,
BD2 _n , BD2 _x body diode D, DD ₁ , DD ₂ , DD _n ,
DD _x , DC ₁ , DC ₂ , DC _n ,
DC _x diode C _1, C _2, C _n capacitors R resistor

Claims (10)

In a balancing circuit for balancing multiple battery units,
Including a plurality of balancing modules, each of which is connected to the plurality of battery units, of which each balancing module is
First switch unit,
The second switch unit,
A first inductor device connected between the first switch unit and the battery unit to which the balancing module is connected;
A second inductor device connected to the second switch unit and coupled to the first inductor device;
Including the above,
The plurality of balancing modules include a first balancing module and a second balancing module, and the first balancing module and the second balancing module are respectively connected to the first battery unit and the second battery unit of the plurality of battery units; The first inductor device of the first balancing module removes surplus energy of the first battery unit according to the open / closed state of the first switch unit of the first balancing module, and inductive energy corresponding to the surplus energy Is stored in the second balancing module, and the second inductor device of the second balancing module transfers the induced energy to the second battery according to the open / close state of the second switch unit of the second balancing module. And providing the over unit, balancing circuits.   The balancing circuit according to claim 1, wherein the inductive energy is stored simultaneously in the second inductor device of each balancing module.   2. The balancing circuit according to claim 1, wherein the second inductor device of the balancing module is connected between the battery unit to which each balancing module is connected and the second switch unit of each balancing module, and the plurality of balancing modules. The first inductor device is coupled to each other, and the second inductor devices of the plurality of balancing modules are coupled to each other. The balancing circuit according to claim 3, wherein each switch unit in the first switch unit and the second switch unit is a unidirectional switch device, and the unidirectional switch device is:
A diode,
A bidirectional switch device connected in series to the diode;
A balancing circuit comprising:   4. The balancing circuit according to claim 3, wherein the second switch unit opens before the first switch unit or opens simultaneously with the closing of the first switch unit. 2. The balancing circuit according to claim 1, wherein the plurality of battery units are connected in series between the high voltage side and the low voltage side, and each balancing module also includes:
An energy storage device used to store the induced energy, the energy storage device being electrically connected between the high voltage side and the low voltage side, and two ends of the energy storage device Are the energy storage devices connected to the second inductor device and the second switch unit, respectively.
A balancing circuit comprising: The balancing circuit according to claim 6, wherein
An energy adjustment circuit, connected to the energy storage device, for selectively adjusting the inductive energy and providing the adjusted inductive energy to the plurality of battery units;
A balancing circuit comprising:   8. The balancing circuit according to claim 7, wherein the plurality of battery units are connected in series 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, wherein the first terminal and the second terminal are respectively connected to two ends of the energy storage device, 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 being connected. 8. The balancing circuit according to claim 7, wherein the energy adjustment circuit includes:
A logic unit that determines whether the induced energy stored by the energy storage device has reached a predetermined energy amount and generates a determination result; and
An adjustment unit that is connected to the logic unit and adjusts the induced energy based on the determination result; and
A balancing circuit comprising: The balancing circuit of claim 1, further comprising:
A control unit comprising a free-running oscillator, wherein the free-running oscillator generates an oscillation signal, and the control unit generates a drive signal based on the oscillation signal to generate the first switch unit and the second switch unit; The control unit for controlling the open / closed state of at least one of the switch units;
A balancing circuit comprising:

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