CN112751387A - Converter system and battery system with same - Google Patents
Converter system and battery system with same Download PDFInfo
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- CN112751387A CN112751387A CN202011619045.9A CN202011619045A CN112751387A CN 112751387 A CN112751387 A CN 112751387A CN 202011619045 A CN202011619045 A CN 202011619045A CN 112751387 A CN112751387 A CN 112751387A
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- voltage
- converter
- electrically connected
- output
- switching tube
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/007—Regulation of charging or discharging current or voltage
- H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
- H02J7/007182—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters in response to battery voltage
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
- H02M3/158—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2207/00—Indexing scheme relating to details of circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J2207/20—Charging or discharging characterised by the power electronics converter
Abstract
The invention provides a converter system and a battery system with the same, comprising: the controller acquires a target transmission voltage of the electrical connection end and a corresponding first DC/DC converter from the first control instruction when receiving the first control instruction, controls the first DC/DC converter to receive electric energy of the rechargeable battery, and adjusts the voltage of the electrical connection end of the first DC/DC converter to the target transmission voltage; when receiving a second control instruction, the controller acquires a corresponding second DC/DC converter from the second control instruction, acquires the charging voltage of a rechargeable battery connected with the battery connecting end of the second DC/DC converter, controls the electrical connecting end of the second DC/DC converter to receive electric energy, adjusts the voltage of the battery connecting end of the second DC/DC converter into the charging voltage, and charges the rechargeable battery; thereby being capable of fully utilizing the retired rechargeable battery.
Description
Technical Field
The invention relates to the technical field of batteries, in particular to a converter system and a battery system with the converter system.
Background
With the technical progress and the improvement of the environmental protection requirement, the electric automobile is widely used, the electric automobile uses the rechargeable battery to provide power, and with the increase of the driving mileage of the electric automobile, the performance of the rechargeable battery is attenuated, namely the charging capacity and/or the power supply voltage of the rechargeable battery are attenuated, and at the moment, the rechargeable battery can only be retired. Although the rechargeable battery can not be used for electric automobiles, the rechargeable battery can be used as an energy storage battery or a common battery, for example, the rechargeable battery can be used for photovoltaic energy storage and wind power energy storage equipment, and can be used for electric bicycles and the like.
In practice, the voltages of the retired rechargeable batteries after charging and discharging are different due to different aging degrees and different use degrees, and it can be understood that if a plurality of similar rechargeable batteries are connected in series to form a battery pack, the voltages between the battery pack and the battery pack sometimes differ by tens of volts or even hundreds of volts, which causes great difficulty in the stepped utilization of the rechargeable batteries. When battery packs of different voltage classes are discharged together for use at the power terminals, some may exceed the power usage voltage requirement and some may be below the power usage voltage requirement. Similarly, when different battery packs are charged, if the same voltage is used for charging, the low-voltage battery pack is overcharged due to large voltage difference, and the high-voltage battery pack is not fully charged due to small voltage difference.
Therefore, it is an urgent problem to design a converter system capable of fully utilizing the rechargeable batteries with different performances.
Disclosure of Invention
The invention aims to provide a converter system and a battery system with the converter system.
In order to achieve one of the above objects, an embodiment of the present invention provides a converter system, including: the DC/DC converters are provided with battery connecting ends and electric connecting ends, the battery connecting ends are provided with a first positive wire and a first negative wire, the electric connecting ends are provided with a second positive wire and a second negative wire, and N is a natural number; the controller is used for acquiring a target transmission voltage of the electric connecting end and acquiring a corresponding first DC/DC converter from a first control instruction when receiving the first control instruction, controlling the first DC/DC converter to receive electric energy of the rechargeable battery and adjusting the voltage of the electric connecting end of the first DC/DC converter to the target transmission voltage; when receiving a second control instruction, the controller acquires a corresponding second DC/DC converter from the second control instruction, acquires the charging voltage of a rechargeable battery connected with the battery connecting end of the second DC/DC converter, controls the electrical connecting end of the second DC/DC converter to receive electric energy, adjusts the voltage of the battery connecting end of the second DC/DC converter to the charging voltage, and charges the rechargeable battery; the first DC/DC converter and the second DC/DC converter are any one of N DC/DC converters.
As a further improvement of an embodiment of the present invention, a first voltage sensor and a second voltage sensor are provided in the DC/DC converter, the first voltage sensor being configured to detect a voltage difference between the first positive connection line and the first negative connection line; the second voltage sensor is used for detecting the voltage difference between the second positive connecting line and the second negative connecting line; the first and second voltage sensors are both electrically connected to the controller 2.
As a further improvement of an embodiment of the present invention, the DC/DC converter includes: the circuit comprises a first switching tube, a second switching tube, a third switching tube, a fourth switching tube, an inductor, a first capacitor and a second capacitor; the first, second, third and fourth switch tubes comprise a first port, a second port and an input end; when the input end is input with a first voltage value, the first port and the second port are conducted; when a second voltage value is input into the input end, the first port and the second port are disconnected, wherein the first voltage value is not equal to the second voltage value; the two ends of the first capacitor are respectively and electrically connected with a first positive electrode wire and a first negative electrode wire, a first port of the first switch tube is electrically connected with the first positive electrode wire, a second port of the first switch tube is electrically connected with a first port of the second switch tube, and a second port of the second switch tube is electrically connected with the first negative electrode wire; two ends of the second capacitor are respectively and electrically connected with a second positive wire and a second negative wire, a first port of the third switch tube is electrically connected with the second positive wire, a second port of the third switch tube is electrically connected with a first port of the fourth switch tube, and a second port of the fourth switch tube is electrically connected with the second negative wire; the first negative electrode wire is electrically connected with the second negative electrode wire, and two ports of the inductor are respectively and electrically connected to the second end of the first switching tube and the second end of the third switching tube; the input ends of the first, second, third and fourth switch tubes are all electrically connected with the controller.
As a further improvement of an embodiment of the present invention, the DC/DC converter further includes: and the current sensor is arranged between the second port of the first switching tube and the inductor.
As a further improvement of an embodiment of the present invention, the controller is provided with N first output terminals and N second output terminals, the N first output terminals respectively corresponding to different DC/DC converters, and the N second output terminals respectively corresponding to different DC/DC converters; the input end of the first switch tube in each DC/DC converter is electrically connected to the corresponding first output end, and the input end of the second switch tube is electrically connected with the corresponding first output end through a first inverter; the input end of a third switching tube in each DC/DC converter is electrically connected to the corresponding second output end, and the input end of a fourth switching tube is electrically connected with the corresponding second output end through a second inverter; when the received voltage is a first voltage value, the first inverter and the second inverter both output a second voltage value; when the received voltage is the second voltage value, the first inverter and the second inverter both output the first voltage value.
As a further improvement of the first embodiment of the present invention, the controller controls the first output terminal corresponding to the first DC/DC converter to output the second voltage value and controls the second output terminal corresponding to the first DC/DC converter to output the rectangular wave having the first and second voltage values at the two levels when the first control command is received and the target power transmission voltage > the power supply voltage of the rechargeable battery, and sets the duty ratio of the rectangular wave based on the target power transmission voltage and the power supply voltage.
As a further improvement of the first embodiment of the present invention, the controller controls the second output terminal corresponding to the first DC/DC converter to output the second voltage value and controls the first output terminal corresponding to the first DC/DC converter to output the rectangular wave having the first and second voltage values at the two levels when the first control command is received and the target power transmission voltage < the power supply voltage of the rechargeable battery, and sets the duty ratio of the rectangular wave based on the target power transmission voltage and the power supply voltage.
As a further improvement of the embodiment of the present invention, the controller acquires an input voltage of the electrical connection terminal of the second DC/DC converter upon receiving the second control command, controls the second output terminal corresponding to the second DC/DC converter to output the second voltage value when the input voltage < the charging voltage of the rechargeable battery, controls the first output terminal corresponding to the second DC/DC converter to output a rectangular wave having two levels of the first and second voltage values, respectively, and sets the duty ratio of the rectangular wave based on the input voltage and the charging voltage.
As a further improvement of the embodiment of the present invention, the controller acquires an input voltage of the electrical connection terminal to the second DC/DC upon receiving the second control command, controls a second voltage value of the first output terminal corresponding to the second DC/DC converter when the input voltage > a charging voltage of the rechargeable battery, controls a second voltage value of the second output terminal corresponding to the second DC/DC converter to output a rectangular wave having two levels of the first and second voltage values, respectively, and sets a duty ratio of the rectangular wave based on the input voltage and the charging voltage.
An embodiment of the present invention further provides a battery system, including: in the above inverter system, the battery connection terminal of the DC/DC converter is electrically connected to a rechargeable battery.
Compared with the prior art, the invention has the technical effects that: the embodiment of the invention provides a converter system and a battery system with the same, wherein the converter system comprises: the controller acquires a target transmission voltage of the electrical connection end and a corresponding first DC/DC converter from the first control instruction when receiving the first control instruction, controls the first DC/DC converter to receive electric energy of the rechargeable battery, and adjusts the voltage of the electrical connection end of the first DC/DC converter to the target transmission voltage; when receiving a second control instruction, the controller acquires a corresponding second DC/DC converter from the second control instruction, acquires the charging voltage of a rechargeable battery connected with the battery connecting end of the second DC/DC converter, controls the electrical connecting end of the second DC/DC converter to receive electric energy, adjusts the voltage of the battery connecting end of the second DC/DC converter into the charging voltage, and charges the rechargeable battery; thereby being capable of fully utilizing the retired rechargeable battery.
Drawings
Fig. 1 is a block diagram of a converter system in an embodiment of the invention;
fig. 2 is a structural diagram of a bidirectional DC/DC converter in the embodiment of the present invention.
Detailed Description
The present invention will be described in detail below with reference to embodiments shown in the drawings. These embodiments are not intended to limit the present invention, and structural, methodological, or functional changes made by those skilled in the art according to these embodiments are included in the scope of the present invention.
Terms such as "upper," "above," "lower," "below," and the like, used herein to denote relative spatial positions, are used for ease of description to describe one element or feature's relationship to another element or feature as illustrated in the figures. The spatially relative positional terms may be intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "below" or "beneath" other elements or features would then be oriented "above" the other elements or features. Thus, the exemplary term "below" can encompass both an orientation of above and below. The device may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
Also, it should be understood that, although the terms first, second, etc. may be used herein to describe various elements or structures, these described elements should not be limited by these terms. These terms are only used to distinguish these descriptive objects from one another. For example, the first positive line may be referred to as the second positive line, and similarly the second positive line may also be referred to as the first positive line, without departing from the scope of the present application.
In this embodiment, as shown in fig. 1, a variable flow system includes:
n bidirectional DC (Direct Current)/DC converters 1, the DC/DC converter 1 having a battery connection terminal 1A and an electrical connection terminal 1B, the battery connection terminal 1A having a first positive line 1A1 and a first negative line 1A2, the electrical connection terminal 1B having a second positive line 1B1 and a second negative line 1B2, N being a natural number; here, the battery connection 1A is used for connecting to a rechargeable battery, and the electrical connection 1B is used for connecting to an electrical consumer; the DC/DC converter 1 has two functions: (1) acquiring electric energy from the rechargeable battery through the battery connection end 1A, and then outputting the electric energy from the electric connection end 1B; (2) electric power is obtained from the electric connection terminal 1B, and then the rechargeable battery is output from the rechargeable battery connection terminal 1A and charged.
Here, the DC/DC converter 1 is a device capable of realizing bidirectional flow of direct-current electric energy, and is capable of realizing constant-voltage charging, discharging, and conversion, constant-power charging, discharging, and conversion, and the like.
The controller 2 is used for acquiring a target transmission voltage of the electric connection end 1B and acquiring a corresponding first DC/DC converter from a first control instruction when receiving the first control instruction, controlling the first DC/DC converter to receive electric energy of the rechargeable battery, and adjusting the voltage of the electric connection end 1B of the first DC/DC converter to the target transmission voltage; here, the controller 2 can control any one of the DC/DC converters 1 to take electric power from the battery connection terminal 1A thereof and can output electric power of a preset voltage at the electric connection terminal 1B.
When receiving a second control instruction, the controller 2 acquires a corresponding second DC/DC converter from the second control instruction, acquires a charging voltage of a rechargeable battery connected to the battery connection terminal 1A of the second DC/DC converter, controls the electrical connection terminal 1B of the second DC/DC converter to receive electric energy, adjusts the voltage of the battery connection terminal 1A of the second DC/DC converter to the charging voltage, and charges the rechargeable battery; the first and second DC/DC converters are each one of the N DC/DC converters 1. Here, the controller 2 can control any one of the DC/DC converters 1 to take electric power from the electrical connection terminal 1B thereof, and can output electric power of a preset voltage (which is a charging voltage of the rechargeable battery) at the battery connection terminal 1A and charge the rechargeable battery.
Here, since the converter system has N DC/DC converters 1, in actual use, it is possible to classify the retired rechargeable batteries, in the same classification, the rechargeable batteries are similar in aging and usage, and then the rechargeable batteries in each classification are connected in series or in parallel and then connected to the battery connection terminal 1A of the same DC/DC converter 1, and in the extreme case, there is only one rechargeable battery in each classification. It can be understood that, at this time, the converter system can be adapted to multiple uses, if there are multiple electrical appliances, the input voltages of the electrical appliances are different, the electrical appliances can be connected to the electrical connection terminals 1B of different DC/DC converters; if the power of an electrical appliance is high and the sum of the powers of the rechargeable batteries in one category cannot meet the requirements, a plurality of DC/DC converters 1 can be selected, the second positive wire 1B1 in the multi-electrical connection end 1B is electrically connected and then connected to the positive input end of the electrical appliance, and the second negative wire 1B2 is electrically connected and then connected to the negative input end of the electrical appliance, so that the power and the voltage meet the requirements, and the rechargeable batteries can be charged.
Here, in actual use, each DC/DC converter 1 may be provided with a unique identifier, and in addition, an upper computer may be provided in the converter system, and the upper computer may receive control of a user, so that the upper computer can send a first control instruction (including at least a target transmission voltage and a unique identifier) or a second control instruction (including at least a unique identifier) to the controller 2, and it is understood that the upper computer may not be located at the same position as the converter system, thereby facilitating remote control by the user; in addition, the upper computer can be replaced by an input device, such as a plurality of keys, a touch screen and the like.
Optionally, the Controller 2 may be a MCU (Micro Controller Unit) or a plurality of MCUs.
In the present embodiment, as shown in fig. 2, the DC/DC converter 1 is provided with a first voltage sensor 161 and a second voltage sensor 162, the first voltage sensor 161 is used for detecting a voltage difference between the first positive connection line 1a1 and the first negative connection line 1a 2; the second voltage sensor 162 is for detecting a voltage difference between the second positive connection line 1B1 and the second negative connection line 1B 2; the first and second voltage sensors are both electrically connected to the controller 2. Here, two terminals are provided in each of the first and second voltage sensors; for the first voltage sensor 161, two terminals thereof may be electrically connected to the first positive connection line 1a1 and the first negative connection line 1a2, respectively; for the second voltage sensor 162, both terminals thereof may be electrically connected to the second positive connection line 1B1 and the second negative connection line 1B2, respectively.
Here, upon receiving the first control command, the controller 2 obtains the target transmission voltage of the electrical connection terminal 1B and the corresponding first DC/DC converter from the first control command, controls the first DC/DC converter to receive the electric energy of the rechargeable battery, and adjusts the voltage of the electrical connection terminal 1B of the first DC/DC converter to the target transmission voltage; it will be appreciated that in actual operation, the voltage at electrical connection 1B may not be exactly equal to the target transmission voltage, and therefore, when the voltage at electrical connection 1B is between [ target transmission voltage- Δ v, target transmission voltage + Δ v ], i.e., where Δ v > 0; at this time, the voltage between the positive and negative connection lines in the electrical connection terminal 1B needs to be acquired from the second voltage sensor 162, and when the voltage is smaller than the target transmission voltage- Δ v or the target transmission voltage + Δ v is smaller than the voltage, the first DC/DC converter needs to be controlled to ensure that the target transmission voltage- Δ v is smaller than or equal to the voltage and smaller than or equal to the target transmission voltage + Δ v.
Similarly, when receiving the second control instruction, the controller 2 acquires the corresponding second DC/DC converter from the second control instruction, acquires the charging voltage of the rechargeable battery connected to the battery connection terminal 1A of the second DC/DC converter, controls the electrical connection terminal of the second DC/DC converter to receive the electric energy, adjusts the voltage of the battery connection terminal 1A of the second DC/DC converter to the charging voltage, and charges the rechargeable battery; it will be appreciated that in actual operation, the voltage at the cell connection 1A cannot be exactly equal to the charging voltage, and therefore, it is sufficient if the voltage at the cell connection 1A lies between [ charging voltage- Δ u, charging voltage + Δ u ], where Δ u > 0; at this time, the voltage between the positive and negative connection lines in the battery connection terminal 1 needs to be acquired from the first voltage sensor 161, and when the voltage is smaller than the charging voltage- Δ u or the charging voltage + Δ u is smaller than the voltage, the first DC/DC converter needs to be controlled to ensure that the charging voltage- Δ u is smaller than or equal to the charging voltage + Δ u.
Here, the voltages collected by the voltage sampling modules in the first and second voltage sensors may be analog signals, and in this case, an a (analog)/D (digital) converter needs to be provided in the controller 2, and the a/D converter can convert the analog signals into digital signals and then send the digital signals to the controller 2.
In the present embodiment, the DC/DC converter 1 includes: the circuit comprises a first switching tube 11, a second switching tube 12, a third switching tube 13, a fourth switching tube 14, an inductor 16, a first capacitor C1 and a second capacitor C2; the first, second, third and fourth switch tubes comprise a first port, a second port and an input end; when the input end is input with a first voltage value, the first port and the second port are conducted; when a second voltage value is input into the input end, the first port and the second port are disconnected, wherein the first voltage value is not equal to the second voltage value; here, the first, second, third and fourth switching tubes may be transistors, triodes, diodes, etc., or may be a circuit composed of several electronic components.
Two ends of the first capacitor C1 are respectively electrically connected to the first positive electrode line 1a1 and the first negative electrode line 1a2, a first port of the first switching tube 11 is electrically connected to the first positive electrode line 1a1, a second port of the first switching tube 11 is electrically connected to a first port of the second switching tube 12, and a second port of the second switching tube 12 is electrically connected to the first negative electrode line 1a 2; two ends of the second capacitor C2 are respectively electrically connected to the second positive electrode line 1B1 and the second negative electrode line 1B2, a first port of the third switch tube 13 is electrically connected to the second positive electrode line 1B1, a second port of the third switch tube 13 is electrically connected to a first port of the fourth switch tube 14, and a second port of the fourth switch tube 14 is electrically connected to the second negative electrode line 1B 2; the first negative electrode line 1a2 and the second negative electrode line 1B2 are electrically connected, and two ports of the inductor 16 are respectively and electrically connected to the second end of the first switch tube 11 and the second end of the third switch tube 13; the input ends of the first, second, third and fourth switch tubes are all electrically connected with the controller 2.
Here, since the input terminals of the first, second, third and fourth switching tubes are all electrically connected to the controller 2, the controller 2 can control the conduction or disconnection between the first and second ports of these switching tubes.
In this embodiment, the DC/DC converter 1 further includes: and the current sensor 15, wherein the current sensor 15 is arranged between the second port of the first switching tube 11 and the inductor 16. Here, it can be understood that, when the voltages of the battery connection terminal 1A and the electrical connection terminal 1B are known, if the current value between the second port of the first switching tube 11 and the inductor 16 is obtained, the voltage of the second port of the first switching tube 11 can be obtained.
In this embodiment, the controller 2 is provided with N first output terminals and N second output terminals, the N first output terminals respectively correspond to different DC/DC converters 1, and the N second output terminals respectively correspond to different DC/DC converters 1; here, there is a one-to-one correspondence between the N first output terminals and the N DC/DC converters 1, and there is a one-to-one correspondence between the N second output terminals and the N DC/DC converters 1.
The input end of the first switch tube in each DC/DC converter 1 is electrically connected to the corresponding first output end, and the input end of the second switch tube is electrically connected to the corresponding first output end through the first inverter 171; the input end of the third switching tube in each DC/DC converter 1 is electrically connected to the corresponding second output end, and the input end of the fourth switching tube is electrically connected to the corresponding second output end through the second inverter 172; when the received voltage is a first voltage value, the first inverter and the second inverter both output a second voltage value; when the received voltage is the second voltage value, the first inverter and the second inverter both output the first voltage value.
In this embodiment, when receiving a first control command and the target power transmission voltage > the power supply voltage of the rechargeable battery, the controller 2 controls the first output terminal corresponding to the first DC/DC converter to output a second voltage value, controls the second output terminal corresponding to the first DC/DC converter to output a rectangular wave having two levels, which are the first and second voltage values, respectively, and sets the duty ratio of the rectangular wave based on the target power transmission voltage and the power supply voltage.
Here, the battery connection terminal 1A is connected to the rechargeable battery and outputs electric energy to the outside through the electrical connection terminal 1B, and the target transmission voltage of the electrical connection terminal 1B > the supply voltage of the rechargeable battery, that is, the DC/DC converter 1 is to perform a step-up operation, which is specifically operated as: the first and second ports of the second switch tube 12 are controlled to be off (i.e. the second voltage value is input to the second switch tube 12), and the first and second ports of the first switch tube 11 are controlled to be on (i.e. the first voltage value is input to the first switch tube 12). At this time, it is necessary to input a first rectangular wave to the third switching tube 13 and a second rectangular wave to the fourth switching tube 14, respectively, and in the first and second rectangular waves, when the first rectangular wave is a first voltage value, the second rectangular wave is a second voltage value; when the first rectangular wave is the second voltage value, the second rectangular wave is the first voltage value, i.e. the first and second rectangular waves are opposite. At this time, when the first and second ports of the fourth switching tube 14 are connected, the first and second ports of the third switching tube 13 are disconnected, and the inductor 16 stores energy; when the first and second ports of the fourth switching tube 14 are disconnected, the first and second ports of the third switching tube 13 are connected, and the inductor 16 outputs electric energy to the electrical connection terminal 1B together with the rechargeable battery, so that the voltage of the electrical connection terminal 1B is increased, it can be understood that the voltage of the electrical connection terminal 1B can be adjusted by adjusting the duty ratio of the first rectangular wave.
In this embodiment, when receiving a first control command and the target power transmission voltage is less than the power supply voltage of the rechargeable battery, the controller 2 controls the second output terminal corresponding to the first DC/DC converter to output a second voltage value, controls the first output terminal corresponding to the first DC/DC converter to output a rectangular wave having two levels, i.e., a first voltage value and a second voltage value, and sets the duty ratio of the rectangular wave based on the target power transmission voltage and the power supply voltage.
Here, the battery connection terminal 1A is connected to the rechargeable battery and outputs electric energy to the outside through the electrical connection terminal 1B, and the target transmission voltage of the electrical connection terminal 1B < the supply voltage of the rechargeable battery, that is, the DC/DC converter 1 is to perform a step-down operation, which is specifically operated as: the first and second ports of the fourth switching tube 14 are controlled to be off (i.e. the second voltage value is input to the fourth switching tube 14), and the first and second ports of the third switching tube 13 are controlled to be on (i.e. the first voltage value is input to the third switching tube 13). At this time, a first rectangular wave needs to be input to the first switching tube 11, and a second rectangular wave needs to be input to the second switching tube 12, wherein when the first rectangular wave is a first voltage value, the second rectangular wave is a second voltage value; when the first rectangular wave is the second voltage value, the second rectangular wave is the first voltage value, i.e. the first and second rectangular waves are opposite. At this time, when the first and second ports of the first switching tube 11 are connected, the first and second ports of the second switching tube 12 are disconnected, and the inductor 16 stores energy; when the first and second ports of the first switching tube 11 are disconnected, the first and second ports of the second switching tube 12 are connected, the inductor 16 outputs electric energy to the electrical connection terminal 1B independently, and the second switching tube 12 is in a freewheeling state, and the supply voltage is reduced, it can be understood that the voltage of the electrical connection terminal 1B can be adjusted by adjusting the duty ratio of the first rectangular wave.
In this embodiment, the controller 2 obtains the input voltage of the electrical connection terminal 1B of the second DC/DC converter upon receiving the second control command, controls the second output terminal corresponding to the second DC/DC converter to output the second voltage value when the input voltage is smaller than the charging voltage of the rechargeable battery, controls the first output terminal corresponding to the second DC/DC converter to output the rectangular wave, where two levels of the rectangular wave are the first and second voltage values, respectively, and sets the duty ratio of the rectangular wave based on the input voltage and the charging voltage.
Here, the battery connection terminal 1A is connected to the rechargeable battery and receives external electric energy through the electrical connection terminal 1B, and the charging voltage of the rechargeable battery > the input voltage of the electrical connection terminal 1B, that is, the DC/DC converter 1 is to perform a step-up operation, which is specifically operated as: the first and second ports of the fourth switching tube 14 are controlled to be off (i.e. the second voltage value is input to the fourth switching tube 14), and the first and second ports of the third switching tube 13 are controlled to be on (i.e. the first voltage value is input to the third switching tube 13). At this time, a first rectangular wave needs to be input to the first switch tube 11, and a second rectangular wave needs to be input to the second switch tube 12, wherein the second rectangular wave is a second voltage value in the first and second rectangular waves when the first rectangular wave is a first voltage value; when the first rectangular wave is the second voltage value, the second rectangular wave is the first voltage value, i.e. the first and second rectangular waves are opposite. At this time, when the first and second ports of the second switching tube 12 are connected, the first and second ports of the first switching tube 11 are disconnected, and the inductor 16 stores energy; when the first and second ports of the second switching tube 12 are disconnected, the first and second ports of the first switching tube 11 are connected, and the inductor 16 outputs electric energy to the battery connection terminal 1A together with external electric energy, so that the voltage of the battery connection terminal 1A is increased, it can be understood that the voltage of the battery connection terminal 1A can be adjusted by adjusting the duty ratio of the first rectangular wave.
In this embodiment, the controller 2 obtains the input voltage of the electrical connection terminal 1B of the second DC/DC upon receiving the second control command, controls the second voltage value of the first output terminal corresponding to the second DC/DC converter when the input voltage > the charging voltage of the rechargeable battery, controls the second output terminal corresponding to the second DC/DC converter to output a rectangular wave, where two levels of the rectangular wave are the first and second voltage values, respectively, and sets the duty ratio of the rectangular wave based on the input voltage and the charging voltage.
The battery connection terminal 1A is connected to the rechargeable battery, and receives external electric energy through the electrical connection terminal 1B, and the charging voltage of the rechargeable battery is less than the input voltage of the electrical connection terminal 1B, that is, the DC/DC converter 1 performs a step-down operation, which is specifically operated as: the first and second ports of the second switch tube 12 are controlled to be off (i.e. the second voltage value is input to the second switch tube 12), and the first and second ports of the first switch tube 11 are controlled to be on (i.e. the first voltage value is input to the first switch tube 11). At this time, it is necessary to input a first rectangular wave to the third switching tube 13 and a second rectangular wave to the second switching tube 14, respectively, and in the first and second rectangular waves, when the first rectangular wave is a first voltage value, the second rectangular wave is a second voltage value; when the first rectangular wave is the second voltage value, the second rectangular wave is the first voltage value, i.e. the first and second rectangular waves are opposite. At this time, when the first and second ports of the third switching tube 13 are connected, the first and second ports of the second switching tube 14 are disconnected, and the inductor 16 stores energy; when the first and second ports of the third switching tube 13 are disconnected, the first and second ports of the second switching tube 14 are connected, the inductor 16 outputs electric energy to the battery connection terminal 1A independently, and the second switching tube 14 is in a freewheeling state, and the supply voltage is reduced, it can be understood that the voltage of the battery connection terminal 1A can be adjusted by adjusting the duty ratio of the first rectangular wave.
An embodiment of the present invention provides a battery system, including: in the inverter system according to the first embodiment, the battery connection terminal 1A of the DC/DC converter 1 is electrically connected to a rechargeable battery.
It should be understood that although the present description refers to embodiments, not every embodiment contains only a single technical solution, and such description is for clarity only, and those skilled in the art should make the description as a whole, and the technical solutions in the embodiments can also be combined appropriately to form other embodiments understood by those skilled in the art.
The above-listed detailed description is only a specific description of a possible embodiment of the present invention, and they are not intended to limit the scope of the present invention, and equivalent embodiments or modifications made without departing from the technical spirit of the present invention should be included in the scope of the present invention.
Claims (10)
1. A variable flow system, comprising:
n DC/DC converters (1), wherein the DC/DC converters (1) are provided with a battery connecting end (1A) and an electric connecting end (1B), the battery connecting end (1A) is provided with a first positive electrode wire (1A1) and a first negative electrode wire (1A2), the electric connecting end (1B) is provided with a second positive electrode wire (1B1) and a second negative electrode wire (1B2), and N is a natural number;
the controller (2) acquires a target transmission voltage of the electric connection end (1B) and a corresponding first DC/DC converter from the first control instruction when receiving the first control instruction, controls the first DC/DC converter to receive electric energy of the rechargeable battery, and adjusts the voltage of the electric connection end (1B) of the first DC/DC converter to the target transmission voltage;
when receiving a second control instruction, the controller (2) acquires a corresponding second DC/DC converter from the second control instruction, acquires the charging voltage of a rechargeable battery connected with a battery connecting end (1A) in the second DC/DC converter, controls an electrical connecting end (1B) of the second DC/DC converter to receive electric energy, adjusts the voltage of the battery connecting end (1A) of the second DC/DC converter to the charging voltage, and charges the rechargeable battery; wherein, the first DC/DC converter and the second DC/DC converter are any one of N DC/DC converters (1).
2. The variable flow system according to claim 1, wherein:
the DC/DC converter (1) is provided with a first voltage sensor (161) and a second voltage sensor (162), wherein the first voltage sensor (161) is used for detecting the voltage difference between the first positive connecting line (1A1) and the first negative connecting line (1A 2); a second voltage sensor (162) for detecting a voltage difference between the second positive connection line (1B1) and the second negative connection line (1B 2); the first and second voltage sensors are both electrically connected to the controller 2.
3. The variable flow system according to claim 1, wherein the DC/DC converter (1) comprises:
the circuit comprises a first switching tube (11), a second switching tube (12), a third switching tube (13), a fourth switching tube (14), an inductor (16), a first capacitor (C1) and a second capacitor (C2); the first, second, third and fourth switch tubes comprise a first port, a second port and an input end; when the input end is input with a first voltage value, the first port and the second port are conducted; when a second voltage value is input into the input end, the first port and the second port are disconnected, wherein the first voltage value is not equal to the second voltage value;
two ends of the first capacitor (C1) are respectively electrically connected with a first positive electrode wire (1A1) and a first negative electrode wire (1A2), a first port of the first switching tube (11) is electrically connected with a first positive electrode wire (1A1), a second port of the first switching tube is electrically connected with a first port of the second switching tube (12), and a second port of the second switching tube (12) is electrically connected with a first negative electrode wire (1A 2);
two ends of a second capacitor (C2) are respectively electrically connected with a second positive electrode wire (1B1) and a second negative electrode wire (1B2), a first port of a third switching tube (13) is electrically connected with the second positive electrode wire (1B1), a second port of the third switching tube is electrically connected with a first port of a fourth switching tube (14), and a second port of the fourth switching tube (14) is electrically connected with the second negative electrode wire (1B 2);
the first negative wire (1A2) and the second negative wire (1B2) are electrically connected, and two ports of the inductor (16) are respectively and electrically connected to the second end of the first switching tube (11) and the second end of the third switching tube (13);
the input ends of the first, second, third and fourth switching tubes are all electrically connected with the controller (2).
4. The variable flow system according to claim 3, wherein the DC/DC converter (1) further comprises:
a current sensor (15), wherein the current sensor (15) is arranged between the second port of the first switch tube (11) and the inductor (16).
5. The variable flow system according to claim 4, wherein:
the controller (2) is provided with N first output ends and N second output ends, the N first output ends are respectively corresponding to different DC/DC converters (1), and the N second output ends are respectively corresponding to different DC/DC converters (1);
the input end of the first switch tube in each DC/DC converter (1) is electrically connected to the corresponding first output end, and the input end of the second switch tube is electrically connected with the corresponding first output end through a first inverter (171);
the input end of a third switching tube in each DC/DC converter (1) is electrically connected to the corresponding second output end, and the input end of a fourth switching tube is electrically connected with the corresponding second output end through a second inverter (172);
when the received voltage is a first voltage value, the first inverter and the second inverter both output a second voltage value; when the received voltage is the second voltage value, the first inverter and the second inverter both output the first voltage value.
6. The variable flow system according to claim 5, wherein:
and when receiving a first control instruction and the target transmission voltage is larger than the supply voltage of the rechargeable battery, the controller (2) controls a first output end corresponding to the first DC/DC converter to output a second voltage value, controls a second output end corresponding to the first DC/DC converter to output a rectangular wave, wherein two levels of the rectangular wave are the first voltage value and the second voltage value respectively, and sets the duty ratio of the rectangular wave based on the target transmission voltage and the supply voltage.
7. The variable flow system according to claim 5, wherein:
and when receiving a first control instruction and the target transmission voltage is less than the supply voltage of the rechargeable battery, the controller (2) controls a second output end corresponding to the first DC/DC converter to output a second voltage value, controls a first output end corresponding to the first DC/DC converter to output a rectangular wave, wherein two levels of the rectangular wave are the first voltage value and the second voltage value respectively, and sets the duty ratio of the rectangular wave based on the target transmission voltage and the supply voltage.
8. The variable flow system according to claim 5, wherein:
the controller (2) obtains an input voltage of an electrical connection end (1B) of the second DC/DC converter after receiving a second control instruction, controls a second output end corresponding to the second DC/DC converter to output a second voltage value when the input voltage is smaller than the charging voltage of the rechargeable battery, controls a first output end corresponding to the second DC/DC converter to output a rectangular wave, wherein two levels of the rectangular wave are a first voltage value and a second voltage value respectively, and sets a duty ratio of the rectangular wave based on the input voltage and the charging voltage.
9. The variable flow system according to claim 5, wherein:
the controller (2) acquires an input voltage of an electrical connection end (1B) of the second DC/DC after receiving a second control instruction, controls a second voltage value of a first output end corresponding to the second DC/DC converter when the input voltage is larger than a charging voltage of the rechargeable battery, controls a second output end corresponding to the second DC/DC converter to output a rectangular wave, wherein two levels of the rectangular wave are the first voltage value and the second voltage value respectively, and sets a duty ratio of the rectangular wave based on the input voltage and the charging voltage.
10. A battery system, comprising:
the converter system of any of claims 1 to 9, wherein the battery connection (1A) in the DC/DC converter (1) is electrically connected to a rechargeable battery.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011619045.9A CN112751387A (en) | 2020-12-31 | 2020-12-31 | Converter system and battery system with same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011619045.9A CN112751387A (en) | 2020-12-31 | 2020-12-31 | Converter system and battery system with same |
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| Publication Number | Publication Date |
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| CN112751387A true CN112751387A (en) | 2021-05-04 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011619045.9A Withdrawn CN112751387A (en) | 2020-12-31 | 2020-12-31 | Converter system and battery system with same |
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| Country | Link |
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| CN (1) | CN112751387A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114655071A (en) * | 2022-02-18 | 2022-06-24 | 华为数字能源技术有限公司 | Battery, battery control method and electric vehicle |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106505730A (en) * | 2016-12-30 | 2017-03-15 | 北京知行新能科技有限公司 | Battery powered managing system |
| CN107204654A (en) * | 2017-07-28 | 2017-09-26 | 北京新能源汽车股份有限公司 | A kind of battery bag control system and charging equipment |
| CN109888875A (en) * | 2019-03-16 | 2019-06-14 | 曾宪伟 | A kind of battery protection and management of charging and discharging system architecture |
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2020
- 2020-12-31 CN CN202011619045.9A patent/CN112751387A/en not_active Withdrawn
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106505730A (en) * | 2016-12-30 | 2017-03-15 | 北京知行新能科技有限公司 | Battery powered managing system |
| CN107204654A (en) * | 2017-07-28 | 2017-09-26 | 北京新能源汽车股份有限公司 | A kind of battery bag control system and charging equipment |
| CN109888875A (en) * | 2019-03-16 | 2019-06-14 | 曾宪伟 | A kind of battery protection and management of charging and discharging system architecture |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114655071A (en) * | 2022-02-18 | 2022-06-24 | 华为数字能源技术有限公司 | Battery, battery control method and electric vehicle |
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Address after: 226100 No.888, Jiuhua Road, high tech Zone, Nantong City, Jiangsu Province Applicant after: Wotai Energy Co.,Ltd. Address before: 226100 No.888, Jiuhua Road, high tech Zone, Nantong City, Jiangsu Province Applicant before: NEOVOLTAIC ENERGY NANTONG Co.,Ltd. |
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Application publication date: 20210504 |