CN108226799B - Battery module monomer voltage acquisition system based on traversal binary tree - Google Patents
Battery module monomer voltage acquisition system based on traversal binary tree Download PDFInfo
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- 238000011897 real-time detection Methods 0.000 abstract 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/396—Acquisition or processing of data for testing or for monitoring individual cells or groups of cells within a battery
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Abstract
Battery module monomer voltage acquisition system based on traverse binary tree belongs to the monomer battery voltage acquisition field. The battery module suitable for series connection form, including the controller, the switch selection unit, step up and down and press module and LED lamp display module, the output signal of the switch selection control end of different combination forms of controller output gives the switch selection unit, select corresponding battery cell by the switch selection unit and carry out voltage acquisition, adjust the signal of gathering for suitable scope through step up and down the module and export for the controller, the voltage of this battery cell is measured to the controller, real-time detection's battery cell can be seen out according to the bright or dark combination of LED lamp among the LED lamp display module. The invention saves ports of the controller, overcomes the influence of common mode voltage, and has strong electric isolation and anti-interference capability among all modules and wide application range.
Description
Technical Field
The invention relates to the field of single battery voltage acquisition, in particular to a method for selectively measuring the voltage of a battery in a high-voltage module formed by connecting a plurality of batteries in series.
Background
With the shortage of energy, the new energy electric automobile is rapidly developed. In order to ensure the safety of the battery and prolong the service life of the battery, the voltage of the battery needs to be collected, and the voltage condition of each time period of the single battery needs to be known. At present, there are many methods for acquiring the voltage of a single battery, for example, as follows:
and the battery voltage acquisition is completed by using the integrated chip. The method has the problems of high price, complex design of peripheral circuits and difficult debugging; in addition, in order to detect more batteries, the integrated chips are required to be cascaded, the difficulty in implementation is increased again, and the more batteries are collected in series, the higher the voltage level is, and the electrical isolation is required to be added.
And the decoder is used for realizing the voltage acquisition of the single battery of the switch selection module. At present, most of universal decoders on the market are fixed input and output ports, the output ends of the decoders are increased by multiple times, and the output ends are easily wasted in the using process; in order to expand the control of the output end, the cascade circuit is complex; and there is also a higher price; there is no problem of electrical isolation.
And the operation amplifier is used for realizing the voltage acquisition of the reduced single battery. The input side of the operational amplifier is limited by the maximum input range of the differential mode voltage and the common mode voltage, and is influenced by the power supply voltage of the operational amplifier. The single power supply mode of the power supply voltage of the common and cheap operational amplifier is mostly 0-32V, and the double power supply mode is mostly +/-16V.
In the voltage acquisition process of the single battery, the common-mode voltage of the battery has a large influence on the voltage acquisition; in certain specific cases, it is not known which battery is being tested if there is no output device; since the acquisition voltage may be as high as several hundred volts, safety issues such as electrical isolation, rapid turn-off acquisition also need to be designed into the voltage acquisition system.
Disclosure of Invention
In view of this, the invention provides a battery module single voltage acquisition system based on a traversal binary tree, which can rapidly switch and know the serial number of a battery being acquired in real time and can complete the acquisition of each battery; the influence of common mode voltage is overcome, and the input voltage of the operational amplifier within a safe range is input; has electrical isolation and saves control ports.
The technical scheme of the invention is as follows:
the battery module single voltage acquisition system based on the traversal binary tree is characterized in that the battery module comprises M single batteries connected in series, and M is more than or equal to 2;
the single voltage acquisition system comprises a controller, a switch selection unit, a buck-boost module and an LED lamp display module,
the controller comprises a switch selection control end and a data control end, wherein N switch selection control ends are respectively a first switch selection control end IO0And a second switch selecting a control terminal IO1… …, Nth switch selection control end ION-1Wherein N is more than or equal to 2; the data control end is connected with the output end of the buck-boost module;
the LED lamp display module comprises N LED lamps, anodes of the N LED lamps are respectively connected with the N switch selection control ends, and cathodes of the N LED lamps are grounded;
the switch selection unit comprises a binary tree structure formed by a plurality of optical couplers and a communication layer formed by 2M optical couplers;
each two optical couplers in the communication layer form an optical coupler group, the first input end of one optical coupler in the optical coupler group is grounded, the second input end of the optical coupler group is connected with the first input end of the other optical coupler in the optical coupler group, the first output end of the optical coupler group serves as the first connection end of the optical coupler group, and the second output end of the optical coupler group serves as the first output end of the switch selection unit and is connected with the first input end of the buck-boost module; a second input end of another optical coupler in the optical coupler group is used as an input end of the optical coupler group, a first output end of the optical coupler group is used as a second connecting end of the optical coupler group, and a second output end of the optical coupler group is used as a second output end of the switch selection unit and is connected with a second input end of the buck-boost module;
the M optical coupling groups of the communication layer correspond to the M single batteries one by one, a first connecting end of each optical coupling group is connected with the anode of the corresponding single battery, and a second connecting end of each optical coupling group is connected with the cathode of the corresponding single battery;
the binary tree structure comprises N layers of node layers, wherein all nodes of the first N-2 layers of node layers are full nodes, M leaf nodes exist, the leaf nodes only appear in the Nth layer and the N-1 layer of node layers, and the number of the nodes of the Nth layer of node layer is equal to the number of the leaf nodes of the M-N-1 layer; each node comprises an optical coupler;
a first input end of the optical coupler on the node of the ith layer node layer of the binary tree structure is connected with an ith switch selection control end IO of the controlleri-1I is more than or equal to 1 and less than or equal to N, the second input ends of the optical couplers on the root node and the left subtree of the binary tree structure are grounded, the second input end of the optical coupler on the right subtree of the binary tree structure is connected with a power supply voltage VCC, the first output end of the optical coupler on the root node is connected with the power supply voltage VCC, and the second output ends of the optical couplers on all nodes of the binary tree structure are connected with the first output ends of the optical couplers on the left subtree and the right subtree; and second output ends of the optical couplers on the M leaf nodes are respectively connected with input ends of the M optical coupler groups in the communicating layer.
Specifically, the buck-boost module comprises a first operational amplifier A1, a second operational amplifier A2, a third operational amplifier A3, a fourth operational amplifier A4, a first sliding resistor R1, a second sliding resistor R2, a third sliding resistor R3, a fourth sliding resistor R4, a fifth sliding resistor R5, a first resistor R6, a second resistor R7, a third resistor R8, a fourth resistor R9 and a fifth resistor R10,
the first sliding resistor R1 and the second sliding resistor R2 are connected in series, the series point of the first sliding resistor R1 and the second sliding resistor R2 is connected with the negative input end of the first operational amplifier A1, the other end of the first sliding resistor R1 serves as the first input end of the buck-boost module, and the other end of the second sliding resistor R2 is grounded;
the third sliding resistor R3 and the fourth sliding resistor R4 are connected in series, the series point of the third sliding resistor R3 and the fourth sliding resistor R4 is connected with the positive input end of the second operational amplifier A2, the other end of the third sliding resistor R3 serves as the second input end of the buck-boost module, and the other end of the fourth sliding resistor R4 is grounded;
the first resistor R6 and the second resistor R7 are connected in series, the series point of the first resistor R3578 and the second resistor R7 is connected with the negative input end of the third operational amplifier A3, the other end of the first resistor R6 is connected with the positive input end and the output end of the first operational amplifier A1, and the other end of the second resistor R7 is grounded;
the third resistor R8 and the fourth resistor R9 are connected in series, the series point of the third resistor R8 and the fourth resistor R9 is connected with the positive input end of the third operational amplifier A3, the other end of the third resistor R8 is connected with the negative input end and the output end of the second operational amplifier A2, the other end of the fourth resistor R9 is connected with the output end of the fourth operational amplifier A4, the negative input end of the fourth operational amplifier A4 is connected after passing through the fifth resistor R10, and the positive input end of the fourth operational amplifier A4 is grounded;
the output end of the third operational amplifier A3 is used as the output end of the buck-boost module, and the fifth sliding resistor R5 is connected between the output end of the third operational amplifier A3 and the negative input end of the fourth operational amplifier a 4.
Specifically, the optical coupler constituting the binary tree structure is a high-speed optical coupler.
The working process of the invention is as follows:
in order to facilitate that each single battery respectively corresponds to each node in the binary tree structure, M single batteries in the battery module are numbered by binary numbers according to the sequence of voltage grades from low to high, and the battery with the lowest voltage grade is numbered as 0. N switches of the controller select the control end IO to output 0 or 1, different single batteries are correspondingly selected according to the output conditions of different permutation and combination of the N controller switches, and one single battery is selected each time.
In the LED lamp display module, when the input of each LED lamp is 1, the lamp is on, when the input of each LED lamp is 0, the lamp is not on, the output condition of each switch selection control end can be seen according to whether each LED lamp in the LED lamp display module is on, and the binary code of the single battery in the corresponding battery module can know the voltage of which battery is detected at the moment.
The specific working process of the switch selection unit is as follows: selecting control end IO only when first switch connected with root node0The whole switch selection unit can be started only when the output is 1, and the IO of the first switch selection control end is set at the initial moment0The output is 1, and in addition, the second output ends of the optical couplers on all the left subtrees are set to be 1 at the initial moment, all the optical couplersAnd the second output end of the optical coupler on the right subtree outputs 0.
When the ith switch of the controller output connected with each node on the ith node layer selects the control end IOi-1When the output of (1), the optical coupler on the left sub-tree is conducted, receives the output of the optical coupler on the upper layer and transmits the output to the optical coupler in the lower layer; the optocoupler on the right subtree is not conducting and keeps the current output. Similarly, when the ith switch output by the controller connected to each node on the ith node layer selects the control end IOi-1When the output of (1) is 0, the optical coupler on the right subtree is conducted, receives the output of the optical coupler on the upper layer and transmits the output to the optical coupler in the lower layer; the optocoupler on the left subtree is not conducting and keeps the current output.
The method comprises the steps of utilizing a front-end traversal mode to control a binary tree structure through N switch selection control ends to carry out time-sharing measurement on M single batteries in a battery module, connecting a first output end and a second output end of a switch selection unit with a voltage boosting and reducing module, adjusting the voltage to be within the voltage range of a proper controller through the voltage boosting and reducing module, and measuring the voltage of the single batteries through a controller.
The invention has the beneficial effects that: the switch selection unit in the invention completes the switching of the single battery by using a binary tree structure, the switching speed is high, and the ports of the controller are saved; the LED lamp display module can be used for knowing which single battery is detected in real time, and the first switch of the controller can be selected to output a control end 0 in emergency to cut off the detection protection circuit; the voltage boosting and reducing module utilizes the slide rheostat to unify voltage input, saves cost, overcomes the influence of common mode voltage, can adjust the voltage of the battery to a range suitable for the measurement of the controller, and ensures the safe and effective use of each chip; and electrical equipment isolation exists among all modules, so that the anti-interference capability is strong, and the application range is wide.
Drawings
Fig. 1 is a schematic structural diagram of a battery module single voltage acquisition system based on a traversal binary tree according to the present invention.
Fig. 2 is a schematic structural diagram of an LED lamp display module in the battery module single voltage acquisition system based on the traversal binary tree according to the present invention.
Fig. 3 is a schematic structural diagram of a switch selection unit in the battery module single voltage acquisition system based on the traversal binary tree.
Fig. 4 is a schematic diagram of a data structure of a binary tree data structure input by a switch selection control terminal IO in the traversal-based binary tree battery module single voltage acquisition system at an initial time.
Fig. 5 is a schematic structural diagram of the buck-boost module in the embodiment.
Detailed Description
The technical solution of the present invention is further described in detail with reference to the accompanying drawings and specific embodiments.
The voltage acquisition system provided by the invention is suitable for series-connected battery modules, wherein each battery module comprises M single batteries which are connected in series, and M is more than or equal to 2. The M single batteries connected in series are numbered by binary numbers according to the sequence of voltage levels from low to high, the battery with the lowest voltage level is numbered as 0, because binary coding can just correspond to a binary tree data structure, and the corresponding single battery can be found when the binary tree data structure is traversed.
As shown in fig. 1, the voltage acquisition system comprises a controller, a switch selection unit, a buck-boost module and an LED lamp display module, wherein when the voltage acquisition system works, the controller selects a single battery in a battery module through the switch selection unit, the voltage of the single battery is acquired to the buck-boost module, the buck-boost module adjusts the voltage of the single battery to a voltage range suitable for the controller, the controller detects the voltage of the single battery, and the LED lamp display module can see which single battery is detected in real time.
Fig. 2 is a schematic structural diagram of an LED lamp display module, which includes N LED lamps, anodes of the N LED lamps are respectively connected to N switch selection control terminals, and cathodes of the N LED lamps are all grounded. No. 1 LED lamp and first switch control end IO0Connected, 2 nd LED lamp and second switch control end IO1Connecting the Nth LED lamp and the Nth switch control end ION-1Connected and indicating the corresponding switch selection control end IO output when the lamp is onGo out 1 and conversely output 0. The LED lamp is on when a high level is input, and is dark when a low level is input. If the 1 st LED lamp is on, the switch selection unit is possibly conducted; if the 1 st LED lamp goes out, the switch selection unit is possibly disconnected; the first switch connected with the first LED lamp normally selects the control end IO0And outputting a high level.
Each switch selection control end IO can traverse a binary tree data structure output by the IO in a front sequence according to the brightness of the LED lamps connected in series, so that the battery which is being detected at the moment can be known under certain specific conditions. If an emergency occurs, the first switch can select the control end IO0The input is 0 and the detection is switched off to achieve protection.
Fig. 3 is a schematic structural diagram of a switch selection module according to the present invention, in which high-speed optical couplers are connected to form a binary tree topology structure for gating a desired cell. The switch selection unit includes a binary tree structure composed of a plurality of photo-couplers and a communication layer composed of 2M photo-couplers.
Each two optical couplers in the communicating layer form an optical coupler group, the first input end of one optical coupler in the optical coupler group is grounded, the second input end of the optical coupler group is connected with the first input end of the other optical coupler, the first output end of the optical coupler group serves as the first connecting end of the optical coupler group, and the second output end of the optical coupler group serves as the first output end of the switch selection unit and is connected with the first input end of the buck-boost module; the second input end of the other optical coupler in the optical coupler group is used as the input end of the optical coupler group, the first output end of the other optical coupler in the optical coupler group is used as the second connecting end of the optical coupler group, and the second output end of the other optical coupler in the optical coupler group is used as the second output end of the switch selection unit and is connected with the second input end of the buck-boost module; m opto-coupler groups of the communication layer correspond to M single batteries one by one, the first connecting end of each opto-coupler group is connected with the anode of the corresponding single battery, and the second connecting end of each opto-coupler group is connected with the cathode of the corresponding single battery.
The binary tree structure comprises N layers of node layers, wherein nodes of the first N-2 layers of node layers are full nodes, the number of leaf nodes is M, the leaf nodes are only arranged on the Nth layer and the N-1 layer of node layers, and the number of the nodes on the Nth layer is equal to M-the N-1 layerThe number of leaf nodes; each node comprises an optical coupler; selecting a control end IO of the ith switch of the first input termination controller of the optical coupler on the node of the ith layer node layer of the binary tree structurei-1I is more than or equal to 1 and less than or equal to N, the root node of the binary tree structure and the second input end of the optical coupler on the left subtree are grounded, the second input end of the optical coupler on the right subtree of the binary tree structure is connected with a power supply voltage VCC, the first output end of the optical coupler on the root node is connected with the power supply voltage VCC, and the second output ends of the optical couplers on all nodes of the binary tree structure are connected with the first output ends of the optical couplers on the left subtree and the right subtree; and second output ends of the optical couplers on the M leaf nodes are respectively connected with input ends of the M optical coupler groups in the communicating layer.
The output of the switch selection control end connected with each layer of node layer controls the optical coupler of the layer, when the output of the switch selection control end connected with the layer is 1, the root node is conducted with the optical coupler on the left sub-tree, and the optical coupler on the right sub-tree is not conducted; when the output of the switch selection control end connected with the layer is 0, the optical coupler on the right subtree is conducted, and the optical couplers on the left subtree and the root node are not conducted, because only the first switch selection control end IO connected with the root node is connected0The whole switch selection unit can be started only when the output is 1, so that the first switch selection control end IO is set at the initial moment0The output is 1. Through changing the combination mode that N switch selection control end output signal, utilize the communicating layer to select different battery cells to detect and with the data transmission who detects to the input of step-up and step-down module.
The topological structure can ensure that each conduction condition of the high-speed optical coupler of the binary tree topological model can be arranged as shown in figure 4.
FIG. 4 is a diagram illustrating the binary tree data structure according to the present invention. Each switch selection control terminal IO can output 2 cases of 0 and 1, and a binary tree data structure is constructed by the 2 cases. The switch selection unit can be started only when the root node is 1, and the root node is set to be 1. Each child node "left sub-tree" is output 1, and "right sub-tree" is output 0. When each high-speed optical coupler is conducted, the voltage vcc received by the previous layer is high level 1, so that if the high-speed optical coupler is conducted, 1 is output, and conversely, 0 is not conducted. Different single batteries can be conducted through different level combinations input by the switch selection control end IO, and the encoding of the single batteries can be known by traversing the binary tree data structure schematic diagram input by the switch selection control end IO in the front sequence according to the output condition of the switch selection control end IO. And the output condition of the switch selection control end IO can be known through the LED lamp display module.
The high-speed optical coupler is connected into a binary tree topological structure by utilizing the characteristic that each node in the binary tree data structure can be accessed and can be accessed only once. Time-sharing measurement can be carried out on 1-M batteries by using the preamble traversal. And according to the characteristics of the binary tree data structure, the switching of M single batteries is controlled by selecting the control end IO through N switches, so that a large number of communication ports can be saved. And a switch selection module consisting of the high-speed optical coupler can play a role in electrical isolation to protect the control module.
Fig. 5 is a schematic view of the buck-boost module according to the present invention. And the voltage boosting and reducing module is used for boosting and reducing the collected voltage of the single battery into proper voltage for the chip and measuring a voltage value. The second output terminal v + of the switch selection cell output in fig. 3 is connected in series with the first sliding resistor R1 and the second sliding resistor R2, and the first output terminal v-in fig. 3 is connected in series with the third sliding resistor R3 and the fourth sliding resistor R4. Because the number of the single batteries connected in series is large, the voltage at the tabs of the batteries connected in series is as high as hundreds of volts and as low as a few volts. The input voltage of the operational amplifier is affected by the power supply voltage, and therefore must be reduced. According to
Proportional control of voltage, according to the same principle
The voltage is controlled proportionally. A measurable voltage is obtained by a voltage follower circuit composed of a first operational amplifier A1 and a second operational amplifier A2, a differential amplifier circuit composed of a third operational amplifier A3 and an inverse proportional feedback voltage amplifier circuit composed of a fourth operational amplifier A4; the accuracy of measuring the voltage of the single battery is ensured.
The slide rheostat in the buck-boost module can reduce and increase voltage according to proportion, and the maximum input of the operational amplifier is smaller than the power supply of the operational amplifier. The series battery pack is affected by the number of batteries connected in series, and the voltage is low, namely several volts, and the voltage is high, namely several hundred volts. The slide rheostat can unify voltage input to meet the input voltage of the operational amplifier, and unifies the power supply voltage of the operational amplifier, so that the cost can be saved. And the subsequent 3 operational amplifier series circuits overcome the influence of common mode voltage and flexibly output measurable voltage. The buck-boost module forms electrical isolation to protect the control module.
Those skilled in the art can make various other specific changes and combinations based on the teachings of the present invention without departing from the spirit of the invention, and these changes and combinations are within the scope of the invention.
Claims (3)
1. The battery module single voltage acquisition system based on the traversal binary tree is characterized in that the battery module comprises M single batteries connected in series, wherein M is more than or equal to 2;
the single voltage acquisition system comprises a controller, a switch selection unit, a buck-boost module and an LED lamp display module,
the controller comprises a switch selection control end and a data control end, wherein N switch selection control ends are respectively a first switch selection control end IO0And a second switch selecting a control terminal IO1… …, Nth switch selection control end ION-1Wherein N is more than or equal to 2; the data control end is connected with the output end of the buck-boost module;
the LED lamp display module comprises N LED lamps, anodes of the N LED lamps are respectively connected with the N switch selection control ends, and cathodes of the N LED lamps are grounded;
the switch selection unit comprises a binary tree structure formed by a plurality of optical couplers and a communication layer formed by 2M optical couplers;
each two optical couplers in the communication layer form an optical coupler group, the first input end of one optical coupler in the optical coupler group is grounded, the second input end of the optical coupler group is connected with the first input end of the other optical coupler in the optical coupler group, the first output end of the optical coupler group serves as the first connection end of the optical coupler group, and the second output end of the optical coupler group serves as the first output end of the switch selection unit and is connected with the first input end of the buck-boost module; a second input end of another optical coupler in the optical coupler group is used as an input end of the optical coupler group, a first output end of the optical coupler group is used as a second connecting end of the optical coupler group, and a second output end of the optical coupler group is used as a second output end of the switch selection unit and is connected with a second input end of the buck-boost module;
the M optical coupling groups of the communication layer correspond to the M single batteries one by one, a first connecting end of each optical coupling group is connected with the anode of the corresponding single battery, and a second connecting end of each optical coupling group is connected with the cathode of the corresponding single battery;
the binary tree structure comprises N layers of node layers, wherein all nodes of the first N-2 layers of node layers are full nodes, M leaf nodes exist, the leaf nodes only appear in the Nth layer and the N-1 layer of node layers, and the number of the nodes of the Nth layer of node layer is equal to the number of the leaf nodes of the M-N-1 layer; each node comprises an optical coupler;
a first input end of the optical coupler on the node of the ith layer node layer of the binary tree structure is connected with an ith switch selection control end IO of the controlleri-1I is more than or equal to 1 and less than or equal to N, the second input ends of the optical couplers on the root node and the left subtree of the binary tree structure are grounded, the second input end of the optical coupler on the right subtree of the binary tree structure is connected with a power supply voltage VCC, the first output end of the optical coupler on the root node is connected with the power supply voltage VCC, and the second output ends of the optical couplers on all nodes of the binary tree structure are connected with the first output ends of the optical couplers on the left subtree and the right subtree; and second output ends of the optical couplers on the M leaf nodes are respectively connected with input ends of the M optical coupler groups in the communicating layer.
2. The traversal-based binary-tree battery module cell voltage acquisition system according to claim 1, wherein the voltage step-up and step-down module comprises a first operational amplifier (A1), a second operational amplifier (A2), a third operational amplifier (A3), a fourth operational amplifier (A4), a first sliding resistor (R1), a second sliding resistor (R2), a third sliding resistor (R3), a fourth sliding resistor (R4), a fifth sliding resistor (R5), a first resistor (R6), a second resistor (R7), a third resistor (R8), a fourth resistor (R9) and a fifth resistor (R10),
the first sliding resistor (R1) and the second sliding resistor (R2) are connected in series, the series point of the first sliding resistor (R1) and the second sliding resistor (R2) is connected with the negative input end of the first operational amplifier (A1), the other end of the first sliding resistor (R1) serves as the first input end of the buck-boost module, and the other end of the second sliding resistor (R2) is grounded;
the third sliding resistor (R3) and the fourth sliding resistor (R4) are connected in series, the series point of the third sliding resistor (R3) and the fourth sliding resistor (R4) is connected with the positive input end of the second operational amplifier (A2), the other end of the third sliding resistor (R3) serves as the second input end of the buck-boost module, and the other end of the fourth sliding resistor (R4) is grounded;
the first resistor (R6) and the second resistor (R7) are connected in series, the series point of the first resistor (R6) is connected with the negative input end of the third operational amplifier (A3), the other end of the first resistor (R6) is connected with the positive input end and the output end of the first operational amplifier (A1), and the other end of the second resistor (R7) is grounded;
the third resistor (R8) and the fourth resistor (R9) are connected in series, the series point of the third resistor (R8) and the fourth resistor (R9) is connected with the positive input end of the third operational amplifier (A3), the other end of the third resistor (R8) is connected with the negative input end and the output end of the second operational amplifier (A2), the other end of the fourth resistor (R9) is connected with the output end of the fourth operational amplifier (A4) and is connected with the negative input end of the fourth operational amplifier (A4) after passing through the fifth resistor (R10), and the positive input end of the fourth operational amplifier (A4) is grounded;
the output end of a third operational amplifier (A3) is used as the output end of the buck-boost module, and a fifth sliding resistor (R5) is connected between the output end of the third operational amplifier (A3) and the negative input end of a fourth operational amplifier (A4).
3. The binary tree traversal-based battery module cell voltage acquisition system as claimed in claim 1, wherein the optical coupler constituting the binary tree structure is a high-speed optical coupler.
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| CN108226799A (en) | 2018-06-29 |
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