CN113783432A - Power battery formation power supply - Google Patents
Power battery formation power supply Download PDFInfo
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- CN113783432A CN113783432A CN202111183807.XA CN202111183807A CN113783432A CN 113783432 A CN113783432 A CN 113783432A CN 202111183807 A CN202111183807 A CN 202111183807A CN 113783432 A CN113783432 A CN 113783432A
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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
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
- H02M3/33576—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements having at least one active switching element at the secondary side of an isolation transformer
- H02M3/33584—Bidirectional converters
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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
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
- H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
- H02J3/322—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means the battery being on-board an electric or hybrid vehicle, e.g. vehicle to grid arrangements [V2G], power aggregation, use of the battery for network load balancing, coordinated or cooperative battery charging
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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
- H02M1/00—Details of apparatus for conversion
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
- H02M1/088—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices
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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
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33507—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters
- H02M3/33515—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters with digital control
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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
- H02J2310/00—The network for supplying or distributing electric power characterised by its spatial reach or by the load
- H02J2310/40—The network being an on-board power network, i.e. within a vehicle
- H02J2310/48—The network being an on-board power network, i.e. within a vehicle for electric vehicles [EV] or hybrid vehicles [HEV]
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Abstract
The invention discloses a power battery formation power supply which has the characteristics of high energy conversion efficiency, high stability and the like, and comprises: the system comprises an alternating current power grid, an AC/DC module, a direct current bus, a plurality of DC/DC modules, a formation battery module and a digital control module; the AD/DC module is respectively connected with the alternating current power grid, the direct current bus and the digital control module; the direct current bus is also connected with a plurality of DC/DC modules; any DC/DC module is also connected with the control module and the formation battery module; the DC/DC module comprises a CLLLC type resonance main circuit, and the CLLLC type resonance main circuit comprises a plurality of power devices which are switching devices; the CLLLC type resonant main circuit is used for realizing the bidirectional flow of energy between the direct-current bus and the formation battery module under the condition that the digital control module applies complementary driving signals to partial power devices in the formation process of the formation battery module.
Description
Technical Field
The invention relates to the technical field of power battery formation, in particular to a power battery formation power supply.
Background
With the development of industry, electric vehicles, uninterruptible power supplies and energy storage batteries are widely used in daily life of people. In particular, in recent years, electric vehicles have become the preferred choice of people due to their advantages such as comfortable driving experience and economical energy saving, and the demand for power batteries will increase rapidly in the future.
Before the battery leaves a factory, a formation process is required, inert substances in the battery are activated by cyclic charge and discharge, and the chemical properties in the battery reach the optimal state, so that the capacity of the battery is the highest, and the market potential of battery formation equipment is huge.
Although the conventional power battery formation equipment can realize bidirectional flow of energy, the power device of the conventional power battery formation equipment is a common silicon semiconductor, and the energy conversion efficiency cannot be further improved. When the device is conducted, a large amount of heat energy is generated due to the internal resistance of the device, so that the device is damaged. With the increase of the demand of the power battery in the future, the formation equipment is in a working state for a long time, and therefore higher requirements are made on the stability of the equipment.
The conventional power battery is converted into a power supply, a buck-boost main circuit is generally adopted in a DC/DC module of the power battery, a power device works in hard on and hard off states, and when the power device is switched on and switched off, huge energy loss is caused due to overlapping of current and voltage, and the loss is gradually increased along with the acceleration of switching frequency.
The battery output of China accounts for about one third of the world output, the data is increasing year by year, huge electric energy is consumed for battery formation every year, and if the energy conversion efficiency and the stability of the conventional power battery formation equipment can be improved, the unnecessary consumption of energy and the expenditure of electric charge can be greatly saved, the maintenance time of the equipment is reduced, and the application prospect is wide.
Disclosure of Invention
Based on this, the invention aims to solve the problems of low energy conversion efficiency and low stability of power battery formation equipment in the prior art, and provides a power battery formation power supply with the characteristics of high energy conversion efficiency, high stability and the like, which can save unnecessary energy consumption and expenditure of electricity charge and reduce the maintenance time of the equipment.
The embodiment of the invention provides a power battery formation power supply, which comprises: the system comprises an alternating current power grid, an AC/DC module, a direct current bus, a plurality of DC/DC modules, a formation battery module and a digital control module; the AC/DC module is respectively connected with the alternating current power grid, the direct current bus and the digital control module; the direct current bus is also connected with a plurality of DC/DC modules; any DC/DC module is also connected with the control module and the formation battery module; wherein the content of the first and second substances,
the DC/DC module comprises a CLLLC type resonance main circuit, the CLLLC type resonance main circuit comprises a plurality of power devices, and any one of the power devices is a switch device; the CLLLC type resonant main circuit is used for realizing bidirectional flow of energy between the direct-current bus and the formation battery module under the condition that the digital control module applies complementary driving signals to part of the power devices in the formation process of the formation battery module.
In the power battery formation power supply provided by the embodiment of the invention, the digital control module can be used as a control center, the digital control module can apply complementary driving signals to a power device of a CLLLC (logic link control) type resonance main circuit of the DC/DC module in the process of charging and discharging the formation battery module in a software programming mode, the dynamic response speed of the system is high, the control flexibility is high, and the change and the upgrade of any process can be realized. The DC/DC module adopts the CLLLC type resonance main circuit, and because the switching devices in the CLLLC type resonance main circuit are in a resonance soft switching state in work, the conversion efficiency of energy can be improved, meanwhile, the realization of soft switching can obviously reduce battery interference, the precision of current and voltage during charging and discharging can be improved, and the working stability of equipment can be improved.
Optionally, the CLLLC-type resonant main circuit further includes a first resonant inductor, a first resonant capacitor, an excitation inductor, an isolation transformer, a second resonant inductor, a second resonant capacitor, and a plurality of diodes;
the plurality of power devices comprise a first group of power devices and a second group of power devices, and the first group of power devices and the second group of power devices respectively comprise four power devices; wherein the content of the first and second substances,
one of the diodes is embedded in any one of the power devices and is in parasitic anti-parallel connection;
the excitation inductor is embedded in the isolation transformer;
one end of the first resonant inductor is connected with the first end of the isolation transformer, and the other end of the first resonant inductor is respectively connected with two power devices in the first group of power devices in parallel;
one end of the first resonant capacitor is connected with the second end of the isolation transformer, and the other end of the first resonant capacitor is respectively connected with the other two power devices in the first group of power devices in parallel;
one end of the second resonant inductor is connected with the third end of the isolation transformer, and the other end of the second resonant inductor is respectively connected with two power devices in the second group of power devices in parallel;
one end of the second resonance capacitor is connected with the fourth end of the isolation transformer, and the other end of the second resonance capacitor is respectively connected with the other two power devices in the second group of power devices in parallel;
two of the power devices of the first set of power devices connected in parallel with two other of the power devices of the first set of power devices;
two of the power devices of the second set of power devices are connected in parallel with two other of the power devices of the second set of power devices.
Optionally, when the CLLLC resonant main circuit works in the forward direction, the isolation transformer reduces the forward voltage to be equal to the voltage required by the formation battery module, so as to charge the formation battery module; alternatively, the first and second electrodes may be,
when the CLLLC type resonant main circuit works reversely, the isolation transformer boosts the voltage of the battery module to realize that energy is fed back to the direct current bus.
Optionally, when the CLLLC resonant main circuit operates in the forward direction, the digital control module applies complementary driving signals to the first group of power devices to implement an inverted flow of energy; each power device in the second group of power devices is parasitic and anti-parallel connected with the diode to be used as a rectifier diode so as to realize current rectification; alternatively, the first and second electrodes may be,
when the CLLLC type resonance main circuit works reversely, the digital control module applies complementary driving signals to the second group of power devices to realize the inversion flow of energy; each power device in the first group of power devices is parasitic with the anti-parallel diode as a rectifier diode so as to realize current rectification.
Optionally, if the CLLLC type resonant main circuit works in the forward direction, at a first time of a first time period, a first current of a first resonant inductor flows through the parasitic antiparallel diodes of the first power device and the fourth power device, and the voltages at the two ends of the first power device and the fourth power device are clamped to 0, at this time, the digital control module turns on signals to the first power device and the fourth power device, so as to turn on the first power device and the fourth power device at zero voltage; the first power device is one of two power devices in the first group of power devices, and the fourth power device is one of the other two power devices in the first group of power devices;
after the first time, the digital control module applies the voltage of the direct current bus between a first node and a second node, and increases the first current and a second current flowing through the excitation inductor, wherein the increase rate of the first current is greater than that of the second current, so that the first current finishes commutation reduction at a second time in the first time period; a third current flowing through the second resonant inductor, through the diode parasitic anti-parallel connection of each of the power devices in the second set of power devices; the first node is a connection node between the other end of the first resonant inductor and two power devices in the first group of power devices, and the second node is a connection node between the other end of the first resonant capacitor and the other two power devices in the first group of power devices.
Optionally, when the CLLLC resonant main circuit operates in the forward direction, at a third time in a second time period after the first time period, the first current is reduced to be equal to the second current, so that no energy on the primary side of the isolation transformer is transferred to the secondary side of the isolation transformer, and a fourth current flowing through a parasitic anti-parallel diode of each power device in the second group of power devices is reduced to 0, the second resonant inductor and the second resonant capacitor exit resonance, and the first resonant inductor, the first resonant capacitor and the excitation inductor perform series resonance.
Optionally, if the CLLLC resonant main circuit works in the reverse direction, at a fourth moment in a third time period after the second time period, a third current of the first resonant inductor flows through the parasitic antiparallel diode of the second power device and the third power device, so as to clamp voltages at two ends of the second power device and the third power device to 0, and at this time, the digital control module turns on signals to the second power device and the third power device, so as to turn on the second power device and the third power device at zero voltage; the second power device is another one of two power devices in the first group of power devices, and the third power device is another one of the other two power devices in the first group of power devices;
after the fourth time, the digital control module applies the voltage of the direct current bus between the first node and the second node, and increases the third current and a second current flowing through the excitation inductor, wherein the rate of increase of the third current is greater than that of the second current, so that the third current completes commutation reduction at a fifth time within the third time period; a first current flowing through the first resonant inductor flows through the diode parasitic in anti-parallel connection with each of the power devices in the first group of power devices.
Optionally, when the CLLLC resonant main circuit operates in the forward direction, at a sixth time of a fourth time period after the third time period, the third current is reduced to be equal to the second current, so that no energy is transferred from the secondary side of the isolation transformer to the primary side of the isolation transformer, thereby reducing a fifth current flowing through a parasitic anti-parallel diode of each power device in the first group of power devices to 0, the second resonant inductor and the second resonant capacitor exit resonance, and the first resonant inductor, the first resonant capacitor and the excitation inductor resonate in series.
Optionally, voltages of the direct current bus and the formation battery module are different, and the voltage conversion is realized by setting a turn ratio between a primary side and a secondary side of the isolation transformer.
Optionally, any of the power devices is a SiC power device;
the digital control module includes: a digital signal processor;
the formation battery module includes a plurality of formation batteries.
It is further preferred that the first and second liquid crystal compositions,
compared with the prior art, the power battery formation power supply provided by the embodiment of the invention can apply complementary driving signals to the power device of the CLLLC type resonance main circuit of the DC/DC module in the process of charging and discharging the formation battery module by adopting a software programming mode, has high dynamic response speed of the system and high control flexibility, and can realize the change and upgrade of any process. The DC/DC module adopts the CLLLC type resonance main circuit, and because the switching devices in the CLLLC type resonance main circuit are in a resonance soft switching state in work, the conversion efficiency of energy can be improved, meanwhile, the realization of soft switching can obviously reduce battery interference, the precision of current and voltage during charging and discharging can be improved, and the working stability of equipment can be improved. The power battery formation power supply provided by the embodiment of the invention has the characteristics of high energy conversion efficiency, high stability and the like, can save unnecessary consumption of energy and expenditure of electric charge, and reduces the overhaul time of equipment.
For a better understanding and practice, the invention is described in detail below with reference to the accompanying drawings.
Drawings
Fig. 1 is a schematic diagram of a system architecture of a power battery formation power supply according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a topology structure of a CLLLC resonant main circuit according to an embodiment of the present invention;
fig. 3 is a waveform diagram of operations of devices in a CLLLC resonant main circuit according to an embodiment of the present invention.
Detailed Description
The terms of orientation of up, down, left, right, front, back, top, bottom, and the like, referred to or may be referred to in this specification, are defined relative to their configuration, and are relative concepts. Therefore, it may be changed according to different positions and different use states. Therefore, these and other directional terms should not be construed as limiting terms.
The implementations described in the exemplary embodiments below are not intended to represent all implementations consistent with the present disclosure. Rather, they are merely examples of implementations consistent with certain aspects of the present disclosure.
The terminology used in the present disclosure is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure. As used in this disclosure, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.
The shapes and sizes of the various elements in the drawings are not to be considered true scale, but are merely illustrative of the implementations described in the exemplary embodiments below.
Referring to fig. 1, a power battery formation power source provided by an embodiment of the present invention may include: an alternating current grid 101, an AC/DC module 102, a direct current bus 103, a plurality of DC/DC modules 104, a formed battery module 105, and a digital control module 106. The AC/DC module 102 may be connected to the AC power grid 101, the DC bus 103, and the digital control module 106, respectively. The DC bus 103 may also be connected to a plurality of DC/DC modules 104. Any of the DC/DC modules 104 may also be connected with a control module and a battery module 105.
Optionally, the DC/DC module 104 may comprise a resonant main circuit of the CLLLC type. The CLLLC resonant main circuit may include a plurality of power devices, and any one of the power devices may be a switching device. In a specific implementation process, the CLLLC resonant main circuit may be configured to, in a formation process of the formation battery module 105, apply complementary driving signals to a part of power devices by the digital control module 106, implement bidirectional flow of energy between the dc bus 103 and the formation battery module 105, that is, no matter the energy flows from the dc bus 103 to the formation battery module 105, or flows from the formation battery module 105 to the dc bus 103, zero-voltage turn-on and zero-current turn-off of the power devices in the CLLLC resonant main circuit can be implemented.
Alternatively, the digital control module 106 may implement the current-voltage control of charging and discharging and the processing of the feedback signal in the formation process of the formation battery module 105 by connecting with the AC/DC module 102 and the plurality of DC/DC modules 104.
In the power battery formation power supply provided by the embodiment of the invention, the digital control module 106 can be used as a control center, the digital control module 106 can apply a complementary driving signal to a power device of a CLLLC (logic link control) type resonance main circuit of the DC/DC module 104 in the process of charging and discharging the formation battery module 105 in a software programming mode, the dynamic response speed of the system is high, the control flexibility is high, and the change and the upgrade of any process can be realized. The DC/DC module 104 adopts the CLLLC resonant main circuit, and since the switching devices in the CLLLC resonant main circuit are all in the resonant soft-switching state during operation, the conversion efficiency of energy can be improved, and meanwhile, the implementation of soft-switching can significantly reduce battery interference, improve the accuracy of current and voltage during charging and discharging, and improve the operating stability of the device.
Optionally, as shown in fig. 1 and 2 in conjunction, the CLLLC resonant main circuit may further include a first resonant inductor L1A first resonant capacitor C1And an excitation inductor LmIsolation transformer TRA second resonant inductor L2A second resonant capacitor C2And a plurality of diodes. The plurality of power devices may include a first group of power devices and a second group of power devices, and each of the first group of power devices and the second group of power devices may include four power devices.
In which a parasitic antiparallel diode is embedded in either power device, e.g. as shown in fig. 2, power device S1Parasitic antiparallel diode D can be embeddedS1. Isolation transformer TRAn excitation inductor L can be embeddedm. First resonant inductor L1May be connected to an isolation transformer TRIs connected to a first terminal of a first resonant inductor L1May be connected in parallel with two power devices of the first group of power devices, respectively, e.g. may be connected with the power device S shown in fig. 2, respectively1And a power device S2And (4) connecting in parallel. First resonant capacitor C1May be connected to an isolation transformer TRIs connected to the first resonant capacitor C1May be connected in parallel with two other power devices of the first group of power devices, for example, may be connected with the power device S shown in fig. 23And a power device S4And (4) connecting in parallel. Second resonant inductor L2May be connected to an isolation transformer TRIs connected to the third terminal of the second resonant inductor L2May be connected in parallel with two power devices of the second group of power devices, respectively, e.g. may be connected with the power device S shown in fig. 2, respectively5And a power device S6And (4) connecting in parallel. Second resonant capacitor C2May be connected to an isolation transformer TRIs connected to the fourth terminal of the second resonant capacitor C2May be connected in parallel with two other power devices of the second group of power devices, respectively, e.g. may be connected with the power device S shown in fig. 2, respectively7And a power device S8And (4) connecting in parallel.
Alternatively, two power devices of the first group of power devices may be connected in parallel with two other power devices of the first group of power devices, e.g., as shown in fig. 2, power device S1And a power device S2Can be connected with the power device S3And a power device S4And (4) connecting in parallel. Two power devices of the second group of power devices may be connected in parallel with two other power devices of the second group of power devices, e.g. as shown in fig. 2, power device S5And a power device S6Can be connected with the power device S7And a power device S8And (4) connecting in parallel.
Alternatively, as shown in fig. 1 and 2 in combination, the isolation transformer T is operated in the forward direction of the CLLLC resonant main circuitRThe forward voltage may be reduced to equal the voltage required for formation battery module 105 to enable charging formation battery module 105. Or, when the CLLLC type resonance main circuit works reversely, the isolation transformer TRThe voltage of the battery module 105 can be boosted to achieve energy feedback to the dc bus 103.
In the embodiment of the invention, the formed battery module 105 is charged when the CLLLC type resonant main circuit works in the forward direction, and energy is fed back to the direct current bus 103 when the CLLLC type resonant main circuit works in the backward direction, so that the bidirectional flow of the energy between the direct current bus 103 and the formed battery module 105 can be realized.
In particular, when the CLLLC resonant main circuit operates in the forward direction, the digital control module 106 may apply complementary driving signals to the first group of power devices, as shown in fig. 2, and may apply complementary driving signals to the power devices S1-S4Complementary driving signals are applied to realize the inversion flow of energy and achieve the inversion function. At this time, the parasitic antiparallel diode of each power device in the second group of power devices may be used as a rectifying diode, as shown in fig. 2, and the parasitic antiparallel diode DS5-DS8Can be used as a rectifier diode to realize current rectification and achieve the rectification function. Alternatively, when the CLLLC resonant main circuit operates in reverse, the digital control module 106 may apply complementary driving signals to the second group of power devices, as shown in fig. 2, and may apply complementary driving signals to the power devices S5-S8Complementary driving signals are applied to realize the inversion flow of energy and achieve the inversion function. At this time, each power device in the first group of power devices is parasitic and antiparallel diode as a rectifier diode, and parasitic antiparallel diode D is shown in fig. 2S1-DS4Can be used as a rectifier diode to realize current rectification and achieve the rectification function.
Alternatively, as shown in fig. 1 to 3, the CLLLC resonant main circuit, when operating in forward direction, may include four operating modes: working mode a, working mode b, working mode c and working mode d. Wherein, in each working mode, the voltage waveform of the circuit of each device can be different.
The four modes of operation of the resonant main circuit of the CLLLC type in the forward direction will be described in detail below.
For convenience of description, the first resonant inductor L is defined as flowing through1The first current is IpFlows through the second resonant inductor L2A third current of isCurrent through excitation inductance LmThe second current is ImFirst resonant capacitor C1And a second resonant capacitor C2Respectively is uC1And uC2。
Optionally, as shown in fig. 1 to 3, the operation period of the operation mode a is a first period t0-t1At a first time t0First resonant inductor L1First current I ofpMay pass through the first power device S1The fourth power device S4Parasitic anti-parallel diode DS1、DS4Follow current, the first power device S can be realized1The fourth power device S4The voltage across (c) is clamped to 0. At this time, the digital control module 106 may give the first power device S1The fourth power device S4The turn-on signal can realize the zero-voltage turn-on of the first power device S1The fourth power device S4。
Optionally, at a first time t0Thereafter, the digital control module 106 may apply the voltage of the dc bus 103 between the first node and the second node, which may increase the first current IpAnd current through the excitation inductor LmSecond current I ofmDue to the first current IpIs greater than the second current ImCan be such that the first current IpAt a first time t within a first time periodxAnd finishing reversing and descending. Flows through the second resonant inductor L2Third current isFlowing through parasitic antiparallel diodes of each power device in the second group of power devices, as shown in fig. 2, isThrough parasitic antiparallel diode DS5-DS8. The first node may be a connection node between the other end of the first resonant inductor and two power devices in the first group of power devices, i.e., a point a shown in fig. 2. The second node may be a connection node between the other end of the first resonant capacitor and the other two power devices in the first group of power devices, i.e., a point B shown in fig. 2.
Wherein the first power device S1For two power devices S in the first group of power devices1、S2Of the fourth power device S4For the other two power devices S in the first group of power devices3、S4One of them.
Optionally, as shown in fig. 1 to 3, the operation period of the operation mode b is the second time period t1-t2I.e. the second time period is located after the first time period. At a third time t of the second time interval1First current IpCan be reduced to the second current ImEqualisation to isolate the transformer TRPrimary side no energy transfer to isolation transformer TRAnd the secondary side is used for reducing the fourth current flowing through the parasitic antiparallel diode of each power device in the second group of power devices to 0, so that zero-current turn-off can be realized. Due to the isolation transformer TRPrimary side no energy transfer to isolation transformer TRSecondary side, which can make the second resonant inductor L2And a second resonant capacitor C2Out of resonance, first resonant inductance L1A first resonant capacitor C1And an excitation inductance LmAnd the series resonance can keep the fifth current flowing through the parasitic anti-parallel diode of each power device in the first group of power devices basically unchanged.
Optionally, as shown in fig. 1 to 3, the working period of the working mode c is a third time period t2-t3I.e. the third time period lies between the second time periodAnd (6) finally. At a fourth time t of the third time2Second resonant inductor L2Third current isMay pass through the second power device S2A third power device S3Parasitic anti-parallel diode DS2、DS3Follow current, the second power device S can be realized2A third power device S3The voltage across (c) is clamped to 0. At this time, the digital control module 106 may give the second power device S2A third power device S3The turn-on signal can realize the zero-voltage turn-on of the second power device S2A third power device S3。
Optionally, at a fourth time t2Thereafter, the digital control module 106 may apply the voltage of the dc bus 103 between the first node and the second node, and may increase the third current isAnd current through the excitation inductor LmSecond current I ofmDue to the third current isIs greater than the second current ImMay be such that the third current isAt a fifth time t within the third time periodyAnd finishing reversing and descending. Flows through the first resonant inductor L1First current I ofpParasitic antiparallel diodes flowing through each power device in the first group of power devices, as shown in fig. 2, IpThrough parasitic antiparallel diode DS1-DS4。
Optionally, as shown in fig. 1 to 3, the working period of the working mode d is a fourth period t3-t4I.e. the fourth time period is located after the third time period. At a sixth time t of the fourth time3Third current isCan be reduced to the second current ImEqualisation to isolate the transformer TRThe secondary side of the transformer has no energy transfer to the isolation transformer TRAnd the primary side is used for reducing the fifth current flowing through the parasitic antiparallel diode of each power device in the first group of power devices to 0, so that zero-current turn-off can be realized. Due to the isolation transformer TRThe secondary side of the transformer has no energy transfer to the isolation transformer TRCan make the first resonant inductance L1And a second resonant capacitor C1Out of resonance, second resonant inductance L2A second resonant capacitor C2And an excitation inductance LmAnd the fourth current flowing through the parasitic anti-parallel diode of each power device in the second group of power devices can be kept basically unchanged through series resonance.
Optionally, as shown in fig. 1-3, the CLLLC resonant main circuit can also include 4 working modes when operating in reverse direction, and its working principle can be similar to that when operating in forward direction, except that the power device is driven by S1-S4Is converted into S5-S8Realize the inversion function ofS5-DS8Transformation into DS1-DS4For the implementation of the rectification function, reference may be specifically made to the above description of the forward operation mode of the CLLLC resonant main circuit, and details are not described herein again.
Alternatively, as shown in fig. 1 to 3, the voltages between the dc bus 103 and the formation battery module 105 may be different, and the voltage conversion may be realized by setting different turns ratios between the primary side and the secondary side of the isolation transformer, in other words, formation operations of different power batteries may be realized.
Alternatively, as shown in connection with fig. 1-3, any of the power devices described above may be SiC power devices. Compared with a common Si power device, the SiC power device can greatly reduce the switching loss of the power device, improve the working frequency of equipment and reduce the volume of a magnetic device.
Optionally, the digital control module 106 may include: a digital signal processor. Illustratively, the digital signal processor may be a TMS320F280049 digital signal processor.
Alternatively, as shown in fig. 1 to 3, the formation battery module 105 may include a plurality of formation batteries, and the formation control may be performed on the plurality of formation batteries at the same time.
Alternatively, as shown in connection with fig. 1-3, the AC/DC module 102 may include an AC/DC conversion device.
Compared with the prior art, the power battery formation power supply provided by the embodiment of the invention can apply complementary driving signals to the power device of the CLLLC type resonance main circuit of the DC/DC module 104 in the process of charging and discharging the formation battery module 105 by adopting a software programming mode, has high system dynamic response speed and high control flexibility, and can realize the change and upgrade of any process. The DC/DC module 104 adopts the CLLLC resonant main circuit, and since the switching devices in the CLLLC resonant main circuit are all in the resonant soft-switching state during operation, the conversion efficiency of energy can be improved, and meanwhile, the implementation of soft-switching can significantly reduce battery interference, improve the accuracy of current and voltage during charging and discharging, and improve the operating stability of the device. The power battery formation power supply provided by the embodiment of the invention has the characteristics of high energy conversion efficiency, high stability and the like, can save unnecessary consumption of energy and expenditure of electric charge, and reduces the overhaul time of equipment.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention.
Claims (10)
1. A power cell generation source, comprising: the system comprises an alternating current power grid, an AC/DC module, a direct current bus, a plurality of DC/DC modules, a formation battery module and a digital control module; the AC/DC module is respectively connected with the alternating current power grid, the direct current bus and the digital control module; the direct current bus is also connected with a plurality of DC/DC modules; any DC/DC module is also connected with the control module and the formation battery module; wherein the content of the first and second substances,
the DC/DC module comprises a CLLLC type resonance main circuit, the CLLLC type resonance main circuit comprises a plurality of power devices, and any one of the power devices is a switch device; the CLLLC type resonant main circuit is used for realizing bidirectional flow of energy between the direct-current bus and the formation battery module under the condition that the digital control module applies complementary driving signals to part of the power devices in the formation process of the formation battery module.
2. The power-cellization power supply according to claim 1, characterized in that said CLLLC type resonant main circuit further comprises a first resonant inductor, a first resonant capacitor, an excitation inductor, an isolation transformer, a second resonant inductor, a second resonant capacitor and a plurality of diodes;
the plurality of power devices comprise a first group of power devices and a second group of power devices, and the first group of power devices and the second group of power devices respectively comprise four power devices; wherein the content of the first and second substances,
one of the diodes is embedded in any one of the power devices and is in parasitic anti-parallel connection;
the excitation inductor is embedded in the isolation transformer;
one end of the first resonant inductor is connected with the first end of the isolation transformer, and the other end of the first resonant inductor is respectively connected with two power devices in the first group of power devices in parallel;
one end of the first resonant capacitor is connected with the second end of the isolation transformer, and the other end of the first resonant capacitor is respectively connected with the other two power devices in the first group of power devices in parallel;
one end of the second resonant inductor is connected with the third end of the isolation transformer, and the other end of the second resonant inductor is respectively connected with two power devices in the second group of power devices in parallel;
one end of the second resonance capacitor is connected with the fourth end of the isolation transformer, and the other end of the second resonance capacitor is respectively connected with the other two power devices in the second group of power devices in parallel;
two of the power devices of the first set of power devices connected in parallel with two other of the power devices of the first set of power devices;
two of the power devices of the second set of power devices are connected in parallel with two other of the power devices of the second set of power devices.
3. The power battery formation power supply according to claim 2, wherein when the CLLLC type resonant main circuit works in a forward direction, the isolation transformer reduces a forward voltage to be equal to a voltage required by the formation battery module so as to charge the formation battery module; alternatively, the first and second electrodes may be,
when the CLLLC type resonant main circuit works reversely, the isolation transformer boosts the voltage of the battery module to realize that energy is fed back to the direct current bus.
4. The power battery formation power supply according to claim 3, wherein when the CLLLC type resonant main circuit works in a forward direction, the digital control module applies complementary driving signals to the first group of power devices to realize an inverted flow of energy; each power device in the second group of power devices is parasitic and anti-parallel connected with the diode to be used as a rectifier diode so as to realize current rectification; alternatively, the first and second electrodes may be,
when the CLLLC type resonance main circuit works reversely, the digital control module applies complementary driving signals to the second group of power devices to realize the inversion flow of energy; each power device in the first group of power devices is parasitic with the anti-parallel diode as a rectifier diode so as to realize current rectification.
5. The power battery formation power supply as claimed in claim 4, wherein if the CLLLC type resonant main circuit operates in a forward direction, at a first time of a first time period, a first current of a first resonant inductor freewheels through the parasitic antiparallel diodes of the first power device and the fourth power device, and the voltage across the first power device and the fourth power device is clamped to 0, and at this time, the digital control module turns on signals to the first power device and the fourth power device, so as to turn on the first power device and the fourth power device at zero voltage; the first power device is one of two power devices in the first group of power devices, and the fourth power device is one of the other two power devices in the first group of power devices;
after the first time, the digital control module applies the voltage of the direct current bus between a first node and a second node, and increases the first current and a second current flowing through the excitation inductor, wherein the increase rate of the first current is greater than that of the second current, so that the first current finishes commutation reduction at a second time in the first time period; a third current flowing through the second resonant inductor, through the diode parasitic anti-parallel connection of each of the power devices in the second set of power devices; the first node is a connection node between the other end of the first resonant inductor and two power devices in the first group of power devices, and the second node is a connection node between the other end of the first resonant capacitor and the other two power devices in the first group of power devices.
6. The power battery formation power supply according to claim 5, wherein when the CLLLC resonant main circuit operates in the forward direction, at a third time of a second time period after the first time period, the first current is decreased to be equal to the second current, so that no energy on the primary side of the isolation transformer is transferred to the secondary side of the isolation transformer, and thus a fourth current flowing through a parasitic anti-parallel diode of each power device in the second group of power devices is decreased to 0, the second resonant inductor and the second resonant capacitor are out of resonance, and the first resonant inductor, the first resonant capacitor and the excitation inductor are in series resonance.
7. The power battery formation power supply as claimed in claim 6, wherein if the CLLLC type resonant main circuit works in reverse direction, at a fourth time of a third time period after the second time period, a third current of the first resonant inductor freewheels through the parasitic antiparallel diodes of the second power device and the third power device, so as to clamp the voltages at the two ends of the second power device and the third power device to 0, and at this time, the digital control module turns on signals to the second power device and the third power device, so as to turn on the second power device and the third power device at zero voltage; the second power device is another one of two power devices in the first group of power devices, and the third power device is another one of the other two power devices in the first group of power devices;
after the fourth time, the digital control module applies the voltage of the direct current bus between the first node and the second node, and increases the third current and a second current flowing through the excitation inductor, wherein the rate of increase of the third current is greater than that of the second current, so that the third current completes commutation reduction at a fifth time within the third time period; a first current flowing through the first resonant inductor flows through the diode parasitic in anti-parallel connection with each of the power devices in the first group of power devices.
8. The power-cell generation power supply of claim 7, wherein when the CLLLC resonant main circuit is operating in the forward direction, at a sixth time of a fourth time period after the third time period, the third current is reduced to be equal to the second current, so that no energy is transferred from the secondary side of the isolation transformer to the primary side of the isolation transformer, thereby reducing the fifth current flowing through the parasitic anti-parallel diode of each power device in the first group of power devices to 0, the second resonant inductor and the second resonant capacitor are out of resonance, and the first resonant inductor, the first resonant capacitor and the excitation inductor are in series resonance.
9. The power battery formation power supply according to any one of claims 2-8, wherein the voltages between the dc bus and the formation battery module are different, and the voltage conversion is achieved by setting the turns ratio between the primary side and the secondary side of the isolation transformer.
10. The power cell generation source of any of claims 1-8, wherein any of the power devices is a SiC power device;
the digital control module includes: a digital signal processor;
the formation battery module includes a plurality of formation batteries.
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Application publication date: 20211210 |