CN117501607A - Voltage conversion device with current sharing function, current sharing method, device and medium - Google Patents
Voltage conversion device with current sharing function, current sharing method, device and medium Download PDFInfo
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Classifications
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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
- 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
Abstract
A voltage conversion device (200), a current sharing method, a device and a medium are provided, which are used for realizing current sharing of the voltage conversion device (200). A voltage conversion device (200) provided with current sharing comprises: a plurality of voltage conversion modules (201), a detection unit (202) and a controller (203) connected in parallel; one end of each voltage conversion module (201) is connected with the input end of the voltage conversion device (200), and the other end of each voltage conversion module (201) is connected with the output end of the voltage conversion device (200); the detection unit (202) is respectively connected with each voltage conversion module (201) and the controller (203), and the detection unit (202) is used for detecting the current of each voltage conversion module (201); the controller (203) is connected with each voltage conversion module (201), and the controller (203) is used for adjusting the negative current of the target voltage conversion module (201) when the difference between the average current of the target voltage conversion module (201) and the average current of the first voltage conversion module (201) exceeds a preset interval according to the current detected by the detection unit (202).
Description
The application relates to the field of power electronics, in particular to a voltage conversion device with current sharing, a current sharing method, a device and a medium.
Boost circuits are one of the common voltage converter topologies, with which Boost functions can be implemented, used in many types of power systems. For example, voltage converters in power systems such as power management systems for electric/hybrid vehicles, photovoltaic power generation systems, communication power supply systems, data centers, and the like often require the use of Boost circuits to effect voltage conversion.
With the rapid development of power electronics technology, the switching frequency of a switching tube in a voltage converter is gradually increased, so that an energy storage element with smaller volume can be selected, and the cost and the volume of the voltage converter are reduced. However, when the voltage converter is applied to a high-power conversion scenario, it is already difficult for a single voltage converter to meet the power conversion requirement, or a high ripple current exists in the electrical signal output by the voltage converter, so that a plurality of voltage converters are usually used to work in parallel to solve the above problem.
When the energy storage values of the energy storage elements of the two voltage converters are greatly different due to the reasons of raw materials, production and manufacturing of the energy storage elements, the output currents of the two voltage converters may be unbalanced, and the unbalanced currents may cause the problems of unbalanced output power of the two voltage converters, overlarge output currents of the single voltage converter and the like.
In view of this, the current parallel voltage converters have a problem of unbalanced output current.
Disclosure of Invention
The application provides a voltage conversion device with current sharing, a current sharing method, a device and a medium, which are used for balancing the current of the voltage conversion device and ensuring the normal operation of the voltage conversion device.
In a first aspect, an embodiment of the present application provides a voltage conversion device with current sharing, where the voltage conversion device includes: the device comprises a plurality of voltage conversion modules, a detection unit and a controller which are connected in parallel.
One end of each voltage conversion module is connected with the input end of the voltage conversion device, the other end of each voltage conversion module is connected with the output end of the voltage conversion device, and each voltage conversion module is used for receiving a driving signal sent by the controller, converting the input voltage of the voltage conversion device into a first voltage according to the driving signal and shunting the input current of the voltage conversion device; the detection unit is respectively connected with each voltage conversion module and the controller, and is used for detecting the current of each voltage conversion module and outputting the detected current to the controller; the controller is connected with each voltage conversion module, and is used for outputting a driving signal for each voltage conversion module, and adjusting the negative current of the target voltage conversion module when the difference of the average current between the target voltage conversion module and the first voltage conversion module exceeds a preset interval according to the current detected by the detection unit; the first voltage conversion module is determined according to the current detected by the detection unit, and the target voltage conversion module is any one voltage conversion module except the first voltage conversion module in the plurality of voltage conversion modules.
By adopting the structure of the voltage conversion device, when the difference of the average currents between the first voltage conversion module and the target voltage conversion module exceeds the preset interval, the problem of current imbalance between the first voltage conversion module and the target voltage conversion module is determined, and the average current of the target voltage conversion module can be adjusted by adjusting the negative current of the target voltage conversion module, so that the average current on the target voltage conversion module is the same as or similar to the average current of the first voltage conversion module, and current sharing between the first voltage conversion module and the target voltage conversion module is realized.
In one possible implementation, each voltage conversion module includes: the first inductor, the first switch and the second switch.
The first end of the first inductor is connected with a first end point of the input end of the voltage conversion device, and the second end of the first inductor is respectively connected with a first electrode of the first switch and a second electrode of the second switch; the second electrode of the first switch is respectively connected with the second endpoint of the input end of the voltage conversion device and the second endpoint of the output end of the voltage conversion device; the first electrode of the second switch is connected with a first end point of the output end of the voltage conversion device.
The controller is used for outputting a first driving signal to the first switch and outputting a second driving signal to the second switch, wherein the first driving signal and the second driving signal form a driving signal of the voltage conversion module.
In one possible implementation manner, if the average current of the target voltage conversion module is greater than the average current of the first voltage conversion module, the controller is configured to adjust the driving signal output to the target voltage conversion module to increase the negative current of the target voltage conversion module when it is determined that the difference between the average currents of the target voltage conversion module and the first voltage conversion module exceeds the preset interval.
By adopting the structure of the voltage conversion device, when the average current of the target voltage conversion module is larger than the average current of the first voltage conversion module and the current between the target voltage conversion module and the first voltage conversion module is unbalanced, the average current of the target voltage conversion module can be reduced by increasing the negative current of the target voltage conversion module, and the adjusted average current of the target voltage conversion module is equal to or similar to the average current of the first voltage conversion module, so that the purpose of current balance between the first voltage conversion module and the target voltage conversion module is achieved.
In one possible implementation, the controller is configured to: when the difference of average currents between the target voltage conversion module and the first voltage conversion module exceeds a preset interval, shifting forward a conduction end point of a first driving signal in the target voltage conversion module for a first duration, and keeping a conduction start point of the first driving signal unchanged; and shifting the conduction starting point of the second driving signal in the target voltage conversion module forward by a first time length, and keeping the conduction ending point of the target voltage conversion module unchanged.
By adopting the structure of the voltage conversion device, the forward energy storage duration of the first inductor can be reduced by reducing the on duration of the first switch, so that the positive current peak value of the target voltage conversion module is reduced, and meanwhile, the reverse energy storage time of the first inductor can be increased by prolonging the on duration of the second switch, and the negative current peak value of the target voltage conversion module is reduced, so that the average current of the target voltage conversion module is reduced.
In one possible implementation, the first time period is determined according to a difference in average current between the target voltage conversion module and the first voltage conversion module and an inductance value of the target voltage conversion module.
With the above-described voltage conversion device structure, the time period required for adjusting the difference in average current can be determined by using the current calculation formula of the inductor coil, given the difference in average current between the target voltage conversion module and the first voltage conversion module and the inductance value.
In one possible implementation manner, when determining that the difference between the average currents of the target voltage conversion module and the first voltage conversion module exceeds a preset interval, the controller shifts the conduction end point of the first driving signal sent to the target voltage conversion module for i times for a second time period, and keeps the conduction start point of the first driving signal unchanged; shifting forward the conduction start point of the second driving signal sent to the target voltage conversion module for i times for a second duration, and keeping the conduction end point of the second driving signal unchanged; wherein i is a positive integer; and sending the adjusted first driving signal and second driving signal to the target voltage conversion module, wherein the difference of average currents between the target voltage conversion module and the first voltage conversion module after the first driving signal and the second driving signal are adjusted is in a preset interval.
When i is 1, the first driving signal sent to the target voltage conversion module at the previous time is the first driving signal sent by the controller for the first time, and the second driving signal sent to the target voltage conversion module at the previous time is the second driving signal sent by the controller for the first time.
By adopting the structure of the voltage conversion device, under the condition that the inductance value in the target voltage conversion module is not determined, a closed loop circulation adjustment mode can be adopted, and whether adjustment is continued or not is determined according to the current on the target voltage conversion module after each adjustment until the average current on the target voltage conversion module is equal to or similar to the average current of the first voltage conversion module, so that the purpose of current sharing between the target voltage conversion module and the first voltage conversion module is achieved.
In one possible implementation, the controller is configured to: when the difference of average currents between the target voltage conversion module and the first voltage conversion module exceeds a preset interval, the conduction end point of the second driving signal of the target voltage conversion module is shifted backwards for a third duration, and the conduction start point of the second driving signal is kept unchanged.
By adopting the structure of the voltage conversion device, the reverse phase energy storage time of the first inductor can be increased by prolonging the conduction time of the second driving signal, so that the negative current peak value of the target voltage conversion module is increased, and the aim of reducing the average current of the target voltage conversion module is fulfilled.
In one possible implementation, the controller is configured to: and shifting forward the conduction end point of the first driving signal of the target voltage conversion module for a fourth duration, and keeping the conduction start point of the first driving signal unchanged.
By adopting the structure of the voltage conversion device, the forward energy storage time of the first inductor can be reduced by reducing the on-time of the first switch, so that the positive current peak value of the first inductor is reduced, and meanwhile, the zero crossing point of the first inductor is shifted forwards due to the reduction of the positive current peak value of the first inductor, so that the reverse energy storage time of the first inductor is prolonged, the negative current peak value of the target voltage conversion module is increased, and the aim of reducing the average current of the target voltage conversion module is fulfilled.
In one possible implementation manner, if the average current of the target voltage conversion module is smaller than the average current of the first voltage conversion module and the average current output by the first voltage conversion module is smaller than a preset threshold, when it is determined that the difference between the average currents of the target voltage conversion module and the first voltage conversion module exceeds a preset interval, the controller is configured to adjust the driving signal output to the target voltage conversion module so as to reduce the negative current of the target voltage conversion module, where the preset threshold is the current stress of the target voltage conversion module.
By adopting the structure of the voltage conversion device, when the difference of the average currents between the first voltage conversion module and the target voltage conversion module exceeds a preset interval, the problem of current imbalance between the first voltage conversion module and the target voltage conversion module is determined, if the average current output by the first voltage conversion module is smaller than the average current of the target voltage conversion module, the average current of the target voltage conversion module can be increased by reducing the negative current of the target voltage conversion module, so that the average current of the target voltage conversion module is equal to or similar to the average current of the first voltage conversion module, and current sharing between the first voltage conversion module and the target voltage conversion module is realized.
In one possible implementation, the controller is configured to: when the difference of average currents between the target voltage conversion module and the first voltage conversion module exceeds a preset interval, shifting the conduction end point of the first driving signal in the target voltage conversion module backwards for a fifth duration, and keeping the conduction start point of the first driving signal unchanged; and shifting the conduction starting point of the second driving signal in the target voltage conversion module backwards for a fifth duration, and keeping the conduction ending point of the second driving signal unchanged.
By adopting the voltage conversion device structure, the forward energy storage duration of the first inductor can be increased by increasing the conduction duration of the first switch, so that the positive current peak value of the target voltage conversion module is increased, and meanwhile, the reverse energy storage time of the first inductor can be reduced by reducing the conduction duration of the second switch, and the peak value of the negative current of the target voltage conversion module is reduced, so that the average current of the target voltage conversion module is increased.
In one possible implementation manner, when determining that the difference between the average currents of the target voltage conversion module and the first voltage conversion module exceeds the preset interval, the controller shifts the conduction end point of the first driving signal sent to the target voltage conversion module at the previous time backward for j sixth time periods, and keeps the conduction start point of the first driving signal unchanged; shifting the conduction starting point of the second driving signal sent to the target voltage conversion module in the previous time backward for j times for a sixth time period, and keeping the conduction ending point of the first driving signal unchanged; j is a positive integer; and sending the adjusted first driving signal and second driving signal to the target voltage conversion module, wherein the difference of average currents between the target voltage conversion module and the first voltage conversion module after the first driving signal and the second driving signal are adjusted is in a preset interval.
When j is 1, the first driving signal sent to the target voltage conversion module at the previous time is the first driving signal sent by the controller for the first time, and the second driving signal sent to the target voltage conversion module at the previous time is the second driving signal sent by the controller for the first time.
By adopting the structure of the voltage conversion device, under the condition that the energy storage parameters of the inductor in the target voltage conversion module are not determined, a closed loop circulation adjustment mode can be adopted, and whether adjustment is continued or not is determined according to the current of the target voltage conversion module after each adjustment until the average current on the target voltage conversion module is equal to or similar to the average current of the first voltage conversion module, so that the purpose of current sharing between the target voltage conversion module and the first voltage conversion module is achieved.
In one possible implementation, the controller is configured to: when the average current difference between the target voltage conversion module and the first voltage conversion module exceeds a preset interval, the conduction ending point of the first driving signal of the target voltage conversion module is shifted backwards for a seventh time period, the conduction starting point of the first driving signal is kept unchanged, and the difference between the conduction ending point of the adjusted first driving signal and the conduction starting point of the second driving signal is a first preset threshold value.
By adopting the structure of the voltage conversion device, the forward energy storage time of the first inductor can be increased by increasing the on-time of the first switch, so that the positive current peak value of the target voltage conversion module is increased, and meanwhile, the zero crossing point of the first inductor is shifted backwards due to the increase of the positive current peak value of the first inductor, so that the reverse energy storage time of the first inductor is reduced, the negative current peak value of the target voltage conversion module is reduced, and the aim of reducing the average current of the target voltage conversion module is fulfilled.
In one possible implementation, the controller is configured to: shifting forward the conduction ending point of the second driving signal of the target voltage conversion module for an eighth time period, keeping the conduction starting point of the second driving signal unchanged, and adjusting the phase difference between the conduction starting point of the second driving signal and the conduction ending point of the first driving signal by a second preset threshold value.
By adopting the structure of the voltage conversion device, the forward energy storage duration of the first inductor can be reduced by reducing the conduction duration of the second driving signal, so that the negative current peak value of the target voltage conversion module is reduced, and the purpose of increasing the average current of the target voltage conversion module is achieved.
In one possible implementation, if the first voltage conversion module and the target voltage conversion module are staggered parallel voltage conversion modules, the periods of the first driving signal and the second driving signal remain unchanged.
By adopting the structure of the voltage conversion device, the turn-off time of the first switch and the second switch can be correspondingly adjusted according to the requirement of the working mode of the voltage conversion module.
In a second aspect, an embodiment of the present application provides a current equalizing method of a voltage conversion device, where the method is applied to the voltage conversion device, and the voltage conversion device may include a plurality of voltage conversion modules connected in parallel, and specifically the method includes the following steps:
detecting the current of each voltage conversion module; calculating the average current of each voltage conversion module according to the current of each voltage conversion module; when the difference of the average currents between the target voltage conversion module and the first voltage conversion module exceeds the preset interval, the negative current of the target voltage conversion module is adjusted so that the difference of the average currents between the target voltage conversion module and the first voltage conversion module is in the preset interval. The first voltage conversion module is determined according to the average current of each voltage conversion module, and the target voltage conversion module is any one voltage conversion module except the first voltage conversion module in the plurality of voltage conversion modules.
By adopting the method, when the difference of the average currents between the first voltage conversion module and the target voltage conversion module exceeds the preset interval, the problem of unbalanced current between the first voltage conversion module and the target voltage conversion module is determined, and the average current of the target voltage conversion module can be adjusted by adjusting the negative current of the target voltage conversion module, so that the average current on the target voltage conversion module is the same as or similar to the average current of the first voltage conversion module, and current sharing between the first voltage conversion module and the target voltage conversion module is realized.
In one possible implementation, adjusting the negative current of the target voltage conversion module includes:
and adjusting the driving signal output to the target voltage conversion module.
Specifically, each voltage conversion module includes a first inductor, a first switch, and a second switch.
The first end of the first inductor is connected with a first end point of the input end of the voltage conversion device, and the second end of the first inductor is respectively connected with a first electrode of the first switch and a second electrode of the second switch; the second electrode of the first switch is respectively connected with the second endpoint of the input end of the voltage conversion device and the second endpoint of the output end of the voltage conversion device; the first electrode of the second switch is connected with a first end point of the output end of the voltage conversion device. The first driving signal received by the first switch and the second driving signal received by the second switch form a driving signal of the voltage conversion module.
By adopting the method, when the current between the target voltage conversion module and the first voltage conversion module is unbalanced, the negative current of the target voltage conversion module can be changed by adjusting the driving signal of the target voltage conversion module, so that the average current of the adjusted target voltage conversion module is equal to or similar to the average current of the first voltage conversion module, and the purpose of current sharing of the voltage conversion device is achieved.
In one possible implementation, if the average current of the target voltage conversion module is greater than the average current of the first voltage conversion module, adjusting the negative current of the target voltage conversion module includes:
and adjusting the driving signal of the target voltage conversion module.
By adopting the method, if the average current of the target voltage conversion module is larger than the average current of the first voltage conversion module, the average current of the target voltage conversion module can be reduced by increasing the negative current of the target voltage conversion module, so that the average current of the adjusted target voltage conversion module is equal to or similar to the average current of the first voltage conversion module, and the purpose of current balance between the first voltage conversion module and the target voltage conversion module is achieved.
In one possible implementation, adjusting the driving signal of the target voltage conversion module includes:
shifting forward the conduction end point of the first driving signal in the target voltage conversion module for a first duration, and keeping the conduction start point of the first driving signal unchanged; and shifting the conduction starting point of the second driving signal in the target voltage conversion module forward by a first time length, and keeping the conduction ending point of the target voltage conversion module unchanged.
By adopting the method, the forward energy storage duration of the first inductor can be reduced by reducing the on duration of the first switch, so that the positive current peak value of the target voltage conversion module is reduced, and meanwhile, the reverse energy storage time of the first inductor can be prolonged by prolonging the on duration of the second switch, so that the negative current peak value of the target voltage conversion module is reduced, and the average current of the target voltage conversion module is reduced.
In one possible implementation, the first time period is determined according to a difference in average current between the target voltage conversion module and the first voltage conversion module and an inductance value of the target voltage conversion module.
By adopting the method, under the condition that the average current difference between the target voltage conversion module and the first voltage conversion module and the inductance value in the voltage conversion module are known, the time length required for adjusting the average current difference can be calculated by using a current calculation formula of the inductance coil.
In one possible implementation, adjusting the driving signal of the target voltage conversion module includes:
shifting forward the conduction end point of the first driving signal sent to the target voltage conversion module for i times for a second time period, and keeping the conduction start point of the first driving signal unchanged; shifting forward the conduction start point of the second driving signal sent to the target voltage conversion module for i times for a second duration, and keeping the conduction end point of the second driving signal unchanged; wherein i is a positive integer; and sending the adjusted first driving signal and second driving signal to the target voltage conversion module, wherein the difference of average currents between the target voltage conversion module and the first voltage conversion module after the first driving signal and the second driving signal are adjusted is in a preset interval.
When i is 1, the first driving signal sent to the target voltage conversion module at the previous time is the first driving signal sent by the controller for the first time, and the second driving signal sent to the target voltage conversion module at the previous time is the second driving signal sent by the controller for the first time.
By adopting the method, under the condition that the inductance value in the target voltage conversion module is not determined, a closed loop circulation adjustment mode can be adopted, whether adjustment is continued or not is determined according to the adjusted current of the target voltage conversion module each time until the average current on the target voltage conversion module is equal to or similar to the average current of the first voltage conversion module, and therefore the purpose of current sharing between the target voltage conversion module and the first voltage conversion module is achieved.
In one possible implementation, adjusting the driving signal of the target voltage conversion module includes:
and shifting the conduction end point of the second driving signal of the target voltage conversion module backwards for a third duration, and keeping the conduction start point of the second driving signal unchanged.
By adopting the method, the reverse phase energy storage time of the first inductor can be increased by prolonging the on-time of the second driving signal, so that the negative current peak value of the target voltage conversion module is increased, and the purpose of reducing the average current of the target voltage conversion module is achieved.
In one possible implementation, adjusting the driving signal of the target voltage conversion module includes:
and shifting forward the conduction end point of the first driving signal of the target voltage conversion module for a fourth duration, and keeping the conduction start point of the first driving signal unchanged.
By adopting the method, the positive phase energy storage time of the first inductor can be reduced by reducing the on-time of the first switch, so that the positive current peak value of the first inductor is reduced, and meanwhile, the zero crossing point of the first inductor is shifted forwards due to the reduction of the positive current peak value of the first inductor, so that the reverse phase energy storage time of the first inductor is prolonged, the negative current peak value of the target voltage conversion module is increased, and the aim of reducing the average current of the target voltage conversion module is fulfilled.
In one possible implementation manner, if the average current of the target voltage conversion module is smaller than the average current of the first voltage conversion module and the average current output by the first voltage conversion module is smaller than the preset threshold, adjusting the negative current of the target voltage conversion module includes:
and adjusting the driving signal of the target voltage conversion module.
By adopting the method, if the average current of the target voltage conversion module is larger than the average current of the first voltage conversion module, the average current of the target voltage conversion module can be reduced by reducing the negative current of the target voltage conversion module, so that the average current of the adjusted target voltage conversion module is equal to or similar to the average current of the first voltage conversion module, and the purpose of current balance between the first voltage conversion module and the target voltage conversion module is achieved.
In one possible implementation, adjusting the driving signal of the target voltage conversion module includes:
shifting the conduction end point of the first driving signal in the target voltage conversion module backwards for a fifth duration, and keeping the conduction start point of the first driving signal unchanged; and shifting the conduction starting point of the second driving signal in the target voltage conversion module backwards for a fifth duration, and keeping the conduction ending point of the second driving signal unchanged.
By adopting the method, the positive phase energy storage duration of the first inductor can be increased by increasing the on duration of the first switch, so that the positive current peak value of the target voltage conversion module can be increased, and meanwhile, the negative phase energy storage time of the first inductor can be reduced by reducing the on duration of the second switch, so that the negative current peak value of the target voltage conversion module can be reduced, and the average current of the target voltage conversion module can be increased.
In one possible implementation, adjusting the driving signal of the target voltage conversion module includes:
shifting the conduction end point of the first driving signal sent to the target voltage conversion module for j times for a sixth time, and keeping the conduction start point of the first driving signal unchanged; shifting the conduction starting point of the second driving signal sent to the target voltage conversion module in the previous time backward for j times for a sixth time period, and keeping the conduction ending point of the first driving signal unchanged; j is a positive integer; and sending the adjusted first driving signal and second driving signal to the target voltage conversion module, wherein the difference of average currents between the target voltage conversion module and the first voltage conversion module after the first driving signal and the second driving signal are adjusted is in a preset interval.
When j is 1, the first driving signal sent to the target voltage conversion module at the previous time is the first driving signal sent by the controller for the first time, and the second driving signal sent to the target voltage conversion module at the previous time is the second driving signal sent by the controller for the first time.
By adopting the method, under the condition that the energy storage parameters of the inductor in the target voltage conversion module are not determined, a closed loop circulation adjustment mode can be adopted, whether adjustment is continued or not is determined according to the adjusted current of the target voltage conversion module each time until the average current on the target voltage conversion module is equal to or similar to the average current of the first voltage conversion module, and therefore the purpose of current sharing between the target voltage conversion module and the first voltage conversion module is achieved.
In one possible implementation, adjusting the driving signal of the target voltage conversion module includes:
and shifting the conduction ending point of the first driving signal of the target voltage conversion module backwards for a seventh time period, keeping the conduction starting point of the first driving signal unchanged, and adjusting the phase difference between the conduction ending point of the first driving signal and the conduction starting point of the second driving signal by a first preset threshold value.
By adopting the method, the positive phase energy storage time of the first inductor can be increased by increasing the on-time of the first switch, so that the positive current peak value of the target voltage conversion module is increased, and meanwhile, the zero crossing point of the first inductor is shifted backwards due to the increase of the positive current peak value of the first inductor, so that the reverse phase energy storage time of the first inductor is reduced, the negative current peak value of the target voltage conversion module is reduced, and the aim of reducing the average current of the target voltage conversion module is fulfilled.
In one possible implementation, adjusting the driving signal of the target voltage conversion module includes:
shifting forward the conduction ending point of the second driving signal of the target voltage conversion module for an eighth time period, keeping the conduction starting point of the second driving signal unchanged, and adjusting the phase difference between the conduction starting point of the second driving signal and the conduction ending point of the first driving signal by a second preset threshold value.
By adopting the method, the forward energy storage duration of the first inductor can be reduced by reducing the conduction duration of the second driving signal, so that the negative current peak value of the target voltage conversion module is reduced, and the purpose of increasing the average current of the target voltage conversion module is achieved.
In one possible implementation, if the first voltage conversion module and the target voltage conversion module are staggered parallel voltage conversion modules, the periods of the first driving signal and the second driving signal remain unchanged.
By adopting the method, the turn-off time of the first switch and the second switch can be correspondingly adjusted according to the requirement of the working mode of the voltage conversion module.
In a third aspect, an embodiment of the present application provides a control device of a voltage conversion device, including: memory, communication module and processor.
Wherein the memory is used for storing program instructions; the communication module is used for receiving and transmitting data; the processor is configured to invoke program instructions stored in the memory to perform the current sharing method of the voltage conversion device provided in any of the possible designs of the second aspect of the embodiment.
In a fourth aspect, embodiments of the present application provide a computer storage medium having a computer program stored therein, which when executed by a computer, causes the computer to perform the method provided by any of the possible designs of the first aspect of the embodiments of the present application.
Fig. 1 is a schematic structural diagram of a voltage conversion device according to an embodiment of the present application;
fig. 2 is a schematic structural diagram of a voltage conversion device according to an embodiment of the present application;
fig. 3 is a schematic diagram illustrating waveform adjustment of a driving signal according to an embodiment of the present disclosure;
Fig. 4 is a schematic diagram illustrating a flow chart of driving signal waveform adjustment according to an embodiment of the present disclosure;
fig. 5 is a second schematic diagram of waveform adjustment of a driving signal according to an embodiment of the present application;
fig. 6 is a third schematic diagram of waveform adjustment of a driving signal according to an embodiment of the present application;
fig. 7 is a schematic diagram of waveform adjustment of a driving signal according to an embodiment of the present application;
fig. 8 is a fifth schematic diagram of waveform adjustment of a driving signal according to an embodiment of the present application;
fig. 9 is a second schematic diagram of a flow chart of driving signal waveform adjustment according to an embodiment of the present application;
fig. 10 is a schematic diagram sixth of waveform adjustment of a driving signal according to an embodiment of the present application;
fig. 11 is a schematic diagram seventh of waveform adjustment of a driving signal according to an embodiment of the present application;
fig. 12 is a schematic diagram eighth of waveform adjustment of a driving signal according to an embodiment of the present application;
fig. 13 is a flow chart of a current equalizing method of a voltage converting apparatus according to an embodiment of the present application;
fig. 14 is a schematic structural diagram of a current equalizing device of a voltage converting device according to an embodiment of the present application.
Embodiments of the present application will be described in detail below with reference to the accompanying drawings.
The specific method of operation in the method embodiment may also be applied to the device embodiment or the system embodiment. In the description of the present application, "at least one" means one or more, wherein a plurality means two or more. In view of this, the term "plurality" may also be understood as "at least two" in embodiments of the present invention. "and/or", describes an association relationship of an association object, and indicates that there may be three relationships, for example, a and/or B, and may indicate: a exists alone, A and B exist together, and B exists alone. The character "/", unless otherwise specified, generally indicates that the associated object is an "or" relationship. In addition, it should be understood that in the description of this application, the words "first," "second," and the like are used merely for distinguishing between the descriptions and not for indicating or implying any relative importance or order.
It should be noted that "connected" in the embodiments of the present application refers to an electrical connection, and two electrical components may be connected directly or indirectly between two electrical components. For example, a may be directly connected to B, or indirectly connected to B through one or more other electrical components, for example, a may be directly connected to B, or directly connected to C, and C may be directly connected to B, where a and B are connected through C.
It should be noted that the switch in the embodiments of the present application may be one or more of various types of switching devices such as a relay, a metal oxide semiconductor field effect transistor (metal oxide semiconductor field effect transistor, MOSFET), a bipolar junction transistor (bipolar junction transistor, BJT), an insulated gate bipolar transistor (insulated gate bipolar transistor, IGBT), a gallium nitride field effect transistor (GaN), a silicon carbide (SiC) power transistor, and the like, which are not further listed in the embodiments of the present application. Each switching device may include a first electrode, a second electrode, and a control electrode for controlling on or off of the switching device. When the switching device is turned on, current can be transmitted between the first electrode and the second electrode of the switching device, and when the switching device is turned off, current cannot be transmitted between the first electrode and the second electrode of the switching device. Taking the MOSFET as an example, the control electrode of the switching device is a gate, the first electrode of the switching device may be a source of the switching device, the second electrode may be a drain of the switching device, or the first electrode may be a drain of the switching device, and the second electrode may be a source of the switching device.
Currently, most electronic devices are installed with a voltage conversion device carrying a voltage converter, so as to realize voltage (or current) conversion inside the electronic device, so as to meet the requirement of the electronic device on voltage or current. For example, a direct current-direct current (DC/DC) voltage converter, a direct current-alternating current (DC/AC) voltage converter, an alternating current-direct current (AC/DC) voltage converter, etc., may respectively implement different forms of voltage (or current) conversion.
Generally, any functional voltage converter can be implemented by using Boost circuit and Buck circuit. For example, when Boost circuits are used as the DC/DC voltage converter, the DC/DC voltage converter may be referred to as a Boost converter. Specifically, boost circuits are a Boost voltage converter topology and are widely used because of their Boost effect.
Fig. 1 is a schematic diagram of a voltage conversion device carrying a Boost circuit. Referring to fig. 1, the voltage conversion device mainly includes a Boost circuit mainly including: the first switch Q1, the second switch Q2, the first inductor L1 and the controller. The first end of the first inductor L1 is connected with a first end point of the input end of the voltage conversion device, and the second end of the first inductor L1 is respectively connected with a first electrode of the first switch Q1 and a second electrode of the second switch Q2; the second electrode of the first switch Q1 is respectively connected with the second endpoint of the input end of the voltage conversion device and the second endpoint of the output end of the voltage conversion device; the first electrode of the second switch Q2 is connected with a first end point of the output end of the voltage conversion device; the controller is connected with the control electrodes of the first switch Q1 and the second switch Q2 respectively and is used for providing driving signals for the first switch Q1 and the second switch Q2. The voltage conversion device may further include a power circuit, or a peripheral circuit of the power circuit, which is not limited in the embodiments of the present application. The power supply circuit can input electric energy for the Boost circuit.
The first terminal of the input end of the voltage conversion device may be a terminal of the voltage conversion device receiving a high potential, the second terminal of the input end of the voltage conversion device may be a terminal of the voltage conversion device receiving a low level, and the first terminal and the second terminal form the input end of the voltage conversion device.
In actual use, the first capacitor C1 is connected between two end points of the output end of the Boost circuit, and the C1 can stabilize the voltage value output by the output end of the Boost circuit. It should be understood that when a plurality of Boost circuits are included in the voltage conversion device, one first capacitor C1 may be provided for each Boost circuit, or one first capacitor C1 may be shared by a plurality of Boost circuits, which is not limited herein.
Boost circuit's Boost principle is: the control switch Q1 is switched on and the switch Q2 is switched off, at the moment, the electric energy input by the input end of the Boost circuit is stored on the inductor L1, and after the storage of the inductor L1 is completed, the control switch Q1 is switched off and the switch Q2 is switched on, at the moment, the electric energy input by the input end of the Boost circuit and the electric energy stored by the inductor L1 are overlapped and output to the output end of the Boost circuit, so that the output voltage of the Boost circuit is higher than the input voltage of the Boost circuit, and the Boost function is realized.
When the voltage conversion device is applied to a high-power conversion scene or the electric energy input by the power circuit has high ripple current, a single Boost circuit cannot meet the high-power conversion requirement or the electric energy output by the Boost circuit has high ripple signals, and in order to solve the problems, a plurality of Boost circuits are usually adopted to work in parallel.
It should be noted that, when the voltage conversion device is applied to a high-power conversion scenario, the number of Boost circuits connected in parallel in the voltage conversion device may be set according to the power to be converted and the conversion power of the single Boost circuit. For example, the power to be converted is 2000 watts (watts, W), and the conversion power of a single Boost circuit is 500W, four Boost circuits may be connected in parallel in the voltage conversion device.
Taking the example that the voltage conversion device comprises two Boost circuits connected in parallel, in an ideal case, the values of the energy storage elements in the two Boost circuits are the same, so the values of the currents on the two Boost circuits are the same. However, in the practical implementation structure, due to different production materials and production conditions of the first inductors in the two Boost circuits, a difference exists between the values of the first inductors in the two Boost circuits, and when the difference is large, a circulation is generated between the two Boost circuits due to different current values, or due to large current values on one or more Boost circuits, the Boost circuits or devices connected with the Boost circuits are damaged, so that the operation safety of the voltage conversion device is affected.
In order to solve the above problems, the embodiments of the present application provide a voltage conversion device with current sharing, a current sharing method, a device and a medium, which are used for balancing currents among a plurality of voltage conversion modules in the voltage conversion device, so as to ensure normal operation of the voltage conversion device.
Referring to fig. 2, a voltage conversion device with current sharing according to an embodiment of the present application, the voltage conversion device 200 may include: a plurality of voltage conversion modules 201, a detection unit 202, and a controller 203 in parallel. It should be noted that the number of the voltage conversion modules 201 connected in parallel in the voltage conversion device 200 is not particularly limited in the present application.
One end of each voltage conversion module 201 is connected to an input end of the voltage conversion device 200, and the other end of each voltage conversion module 201 is connected to an output end of the voltage conversion device 200, where each voltage conversion module 201 is configured to receive a driving signal sent by the controller 203, convert an input voltage of the voltage conversion device 200 into a first voltage according to the driving signal, and split an input current of the voltage conversion device 200.
The detection unit 202 is connected to each voltage conversion module 201 and the controller 203, and the detection unit 202 is configured to detect a current of each voltage conversion module 201 and output the detected current to the controller 203.
The controller 203 is connected to each voltage conversion module 201, and the controller 203 may provide a driving signal to each voltage conversion module 201, and adjust the negative current of the target voltage conversion module 201 to make the difference between the average currents of the target voltage conversion module 201 and the first voltage conversion module 201 be in a preset interval when determining that the difference between the average currents of the target voltage conversion module 201 and the first voltage conversion module 201 exceeds the preset interval according to the current detected by the detection unit 202. The preset interval is a current allowable error between two voltage conversion modules, and the error value can be specifically set according to an application scenario of the voltage conversion device, which is not limited herein.
The first voltage conversion module is determined according to the current detected by the detection unit 202, and the target voltage conversion module is any one voltage conversion module except the first voltage conversion module among the plurality of voltage conversion modules.
It should be understood that the first voltage conversion module may be a voltage conversion module that outputs the minimum average current, or may be a voltage conversion module that outputs the maximum average current, or may be any other module, which is not specifically limited herein.
It should be noted that, the negative current is the current flowing to the input end from the output end of the voltage conversion module, and the positive current is the current flowing to the output end from the input end of the voltage conversion module.
In practical use, the voltage conversion module 201 is a Boost converter provided with a storage inductor, and the Boost circuit shown in fig. 1 is a possible specific example of the voltage conversion module 201. In practical applications, the voltage conversion module 201 has a variety of possible implementation structures, which are not listed here, but these boost converters can be used in the present application.
With the voltage conversion device 200 with current sharing, the controller 203 may calculate the average current of each voltage conversion module 201 according to the current detected by the detection unit 202, determine that the current imbalance exists between the target voltage conversion module and the first voltage conversion module when the difference between the average currents between the target voltage conversion module and the first voltage conversion module exceeds the preset interval, and adjust the average current of the target voltage conversion module by adjusting the negative current of the target voltage conversion module, thereby realizing the effect of current balance between the target voltage conversion module and the first voltage conversion module after adjusting the negative current.
In particular, during implementation, in order to adjust the negative current of the target voltage conversion module, the controller 203 may adjust the driving signal that is originally output to the target voltage conversion module, where the adjusted driving signal changes the on time and the on duration of the switching device in the target voltage conversion module, so that the current on the target voltage conversion module after the driving signal is adjusted is changed, thereby changing the average current on the target voltage conversion module.
In practical use, there are two ways for the controller 203 to adjust the negative current of the target voltage conversion module according to the average current on the target voltage conversion module. Specifically, if the average current on the target voltage conversion module is greater than the average current of the first voltage conversion module, when determining that the difference between the average currents of the target voltage conversion module and the first voltage conversion module exceeds the preset interval, the controller 203 may adjust the driving signal output to the target voltage conversion module to increase the negative current of the target voltage conversion module and reduce the average current of the target voltage conversion module; if the average current on the target voltage conversion module is smaller than the average current of the first voltage conversion module and the average current output by the first voltage conversion module is smaller than the preset threshold, the controller 203 may adjust the driving signal to the target voltage conversion module to reduce the negative current of the target voltage conversion module and increase the average current of the target voltage conversion module when determining that the difference between the average currents of the target voltage conversion module and the first voltage conversion module exceeds the preset interval. The preset threshold value may be a maximum working current of the switching devices in the target voltage conversion module and the first voltage conversion module, so as to satisfy current stress of the switching devices in the target voltage conversion module and the first voltage conversion module.
The following describes the above-mentioned two ways of adjusting the negative current of the target voltage conversion module by the controller 203 in detail with reference to the embodiment and the Boost circuit structure shown in fig. 1. The driving signal output by the controller 203 to the first switch may be regarded as a first driving signal, the driving signal output by the controller 203 to the second switch may be regarded as a second driving signal, and the first driving signal and the second driving signal constitute the driving signal output by the controller 203 to the voltage conversion module 201.
Embodiment 1,
As before, if the average current on the target voltage conversion module is greater than the average current of the first voltage conversion module, in order to achieve current averaging between the two modules, the average current of the target voltage conversion module needs to be reduced. In this embodiment, the controller 203 may increase the negative current of the target voltage conversion module and decrease the average current of the target voltage conversion module by adjusting the waveforms of the first driving signal and/or the second driving signal. Several ways of increasing the negative current of the target voltage conversion module are described below in a few specific examples.
Example one
In an example one, in order to increase the negative current of the target voltage conversion module, so that the average current of the target voltage conversion module is equal to or similar to the average current of the first voltage conversion module, the conduction end point of the first driving signal in the target voltage conversion module may be shifted forward for a first duration, and the conduction start point of the first driving signal is kept unchanged; and shifting the conduction starting point of the second driving signal in the target voltage conversion module forward by a first time length, and keeping the conduction ending point of the target voltage conversion module unchanged.
In one possible implementation manner, if the first voltage conversion module and the target voltage conversion module are staggered parallel voltage conversion modules, the periods of the driving signals of the first voltage conversion module and the target voltage conversion module need to be kept consistent, and in order to achieve consistent periods of the driving signals between the two voltage conversion modules, the periods of the first driving signal and the second driving signal need to be kept unchanged. In order to realize the constant period of the first driving signal and the second driving signal, it is necessary to keep the turn-off end point of the first driving signal constant, shift the turn-off start point of the first driving signal forward for a first duration, and keep the turn-off start point of the second driving signal constant, shift the turn-off end point of the second driving signal forward for the first duration. Specifically, the waveform diagram of the adjustment of the driving signal can be seen in fig. 3. Wherein, the solid line is the original driving signal waveform, and the dotted line is the adjusted driving signal waveform.
Referring to fig. 3, when the turn-on end point of the first driving signal is shifted forward by a first period of time, and the turn-on start point of the first driving signal is maintained unchanged, the turn-on time of the first switch Q1 is reduced by the first period of time. And shifting the conduction starting point of the second driving signal in the target voltage conversion module forward for a first time length, and keeping the conduction ending point of the target voltage conversion module unchanged, so that the conduction time of the second switch Q2 is increased by the first time length. Since the on-time of the first switch Q1 is reduced by the first time, the energy storage time of the first inductor L is reduced by the first time, the stored energy of the inductor L1 is reduced, and the positive current peak value of the corresponding target voltage conversion module is reduced. In the conduction time of the Q2, when the electric energy stored in the inductor L1 is consumed, the electric energy stored in the first capacitor C1 is reversely transmitted to the inductor L1, and as the conduction time of the second switch Q2 is increased by a first time, the energy storage time of the first capacitor C1 is reversely prolonged to the first inductor L1, and the longer the reverse energy storage time of the inductor L1 is, the larger the negative current value of the target voltage conversion module is, and the negative current peak value of the target voltage conversion module is correspondingly increased. Since the positive current peak of the target voltage conversion module is reduced and the negative current peak is increased, the average current of the target voltage conversion module is reduced to be similar to or equal to the average current of the first voltage conversion module. The positive current peak value is the maximum value of the positive current of the voltage conversion device, and the negative current peak value is the maximum value of the negative current of the voltage conversion device.
In another possible implementation manner, if the first voltage conversion module and the target voltage conversion module are non-interleaved parallel voltage conversion modules, the driving signal period of the target voltage conversion module may be the same as or different from the driving signal period of the first voltage conversion module. When the driving signal period of the target voltage conversion module is the same as the driving signal period of the first voltage conversion module, the driving signal period of the target voltage conversion module needs to be kept unchanged, at this time, the turn-off end time point of the first driving signal is kept unchanged, the turn-off starting point of the first driving signal is shifted forward for a first duration, the turn-off starting point of the second driving signal is kept unchanged, and the turn-off end point of the second driving signal is shifted forward for the first duration; when the driving signal period of the target voltage conversion module is different from the driving signal period of the first voltage conversion module, the driving signal period of the target voltage conversion module is changed, and at this time, the turn-off duration of the first driving signal and the second driving signal can be kept unchanged.
It should be understood that, when the period of the driving signal of the target voltage conversion module changes, the principle of adjusting the negative current of the first driving signal and the second driving signal is the same as the negative current adjustment principle when the period of the driving signal of the target voltage conversion module is unchanged, but the period of the first driving signal and the period of the second driving signal change, which is not repeated herein.
When the negative current adjustment scheme is adopted, the first duration can be calculated according to the average current difference between the target voltage conversion module and the first voltage conversion module and the energy storage parameter of the target voltage conversion module.
Specifically, in the case of determining the difference between the average currents of the target voltage conversion module and the first voltage conversion module and the inductance value of the first inductor, a first period of time required to adjust the difference between the average currents at the present inductance value is calculated using an inductance current calculation formula.
In one possible implementation manner, if the inductance value of the first inductor in the target voltage conversion module is not determined, in order to increase the negative current of the target voltage conversion module, a closed loop adjustment manner shown in fig. 4 may be adopted, which is specifically as follows:
step 401, the conduction end point of the first driving signal sent to the target voltage conversion module at the previous time is shifted forward for a second period of time, and the conduction start point of the first driving signal is kept unchanged.
It should be noted that, when the driving signal of the target voltage conversion module is adjusted for the first time, the first driving signal sent to the target voltage conversion module at the previous time is the first driving signal sent by the controller for the first time.
Step 402, shifting forward the conduction start point of the second driving signal sent to the target voltage conversion module for a second duration, and keeping the conduction end point of the second driving signal unchanged.
It should be noted that, when the driving signal of the target voltage conversion module is adjusted for the first time, the second driving signal sent to the target voltage conversion module in the previous time is the second driving signal sent by the controller for the first time.
Step 403, sending the adjusted first driving signal and second driving signal to the target voltage conversion module.
Step 404, obtaining an output current of the target voltage conversion module, and calculating a difference between average currents of the target voltage conversion module and the first voltage conversion module.
Step 405, determining whether the difference between the average currents of the target voltage conversion module and the first voltage conversion module calculated at this time is within a preset range, if so, executing step 406; otherwise, go back to step 401.
In actual use, steps 401 and 402 may be performed i times until the condition of step 405 is met. Wherein i is a natural number.
Step 406, using the current latest adjusted first driving signal and second driving signal as the latest driving signal of the target voltage conversion module.
When the controller adjusts the negative current of the target module in the closed loop adjustment manner shown in fig. 4, it may determine whether to perform the second driving signal adjustment according to the average current of the target voltage conversion module and the average current difference between the target voltage conversion module and the first voltage conversion module after each adjustment of the driving signal until the average current difference between the target voltage conversion module and the average current of the first voltage conversion module after the adjustment is within a preset interval.
It should be noted that, if the first voltage conversion module and the target voltage conversion module are staggered parallel voltage conversion modules, there is a fixed phase difference between the driving signals of the first voltage conversion module and the target voltage conversion module, and when the closed loop adjustment scheme shown in fig. 4 is executed, the driving signal of the first voltage conversion module may be adjusted according to the fixed phase deviation and then be used as the driving signal of the target voltage conversion module.
It should be understood that the principle of negative current adjustment by the closed loop adjustment scheme is the same as that of the target voltage conversion module when the driving signal period is unchanged, and will not be repeated herein.
Example two
In the second example, in order to increase the negative current of the target voltage conversion module, the average current of the target voltage conversion module is equal to or similar to the average current of the first voltage conversion module, the conduction end point of the second driving signal of the target voltage conversion module may be shifted backward for a third duration, and the conduction start point of the second driving signal may be kept unchanged.
In one possible implementation, if the target voltage conversion module and the first voltage conversion module are interleaved parallel voltage conversion modules, the periods of the first driving signal and the second driving signal need to be kept unchanged. In order to achieve that the period of the first and second drive signals is unchanged, the off-end point of the second drive signal needs to be shifted forward backward by a first period of time. Specifically, the waveform diagram of the adjustment of the driving signal can be seen in fig. 5. Wherein, the solid line is the original driving signal waveform, and the dotted line is the adjusted driving signal waveform.
Referring to fig. 5, when the turn-on end point of the second driving signal is shifted backward by a third period of time, keeping the turn-on start point of the second driving signal unchanged, the turn-on time of the second switch Q2 is increased by the third period of time. Because the conduction time of the second switch Q2 is prolonged by the third time, the energy storage time of the first capacitor C1 in the opposite phase direction to the first inductor L1 is prolonged, and the longer the energy storage time of the first capacitor L1 in the opposite phase direction is, the larger the negative current value of the target voltage conversion module is, and the negative current peak value of the target voltage conversion module is correspondingly increased. Since the negative current peak value of the target voltage conversion module increases, the average current of the target voltage conversion module decreases, so that the average current of the target voltage conversion module is similar to or equal to the average current of the first voltage conversion module.
With the above scheme, the negative current is increased mainly by adjusting the second driving signal, so that the first driving signal can be kept unchanged.
In another possible implementation manner, if the first voltage conversion module and the target voltage conversion module are non-interleaved parallel voltage conversion modules, the driving signal period of the target voltage conversion module may be the same as or different from the driving signal period of the first voltage conversion module. When the driving signal period of the target voltage conversion module is the same as the driving signal period of the first voltage conversion module, the driving signal period of the target voltage conversion module needs to be kept unchanged, and at the moment, the turn-off ending time point of the second driving signal is shifted backwards and forwards for a first duration; when the driving signal period of the target voltage conversion module is different from the driving signal period of the first voltage conversion module, the driving signal period of the target voltage conversion module is changed, so that the turn-off duration of the first driving signal can be kept unchanged.
It should be understood that, when the period of the driving signal of the target voltage conversion module is changed, the principle of adjusting the negative current by the second driving signal is the same as the principle of adjusting the negative current when the period of the driving signal of the target voltage conversion module is unchanged, but the period of the second driving signal is prolonged, which is not repeated herein.
Example three
In the third example, in order to increase the negative current of the target voltage conversion module, the average current of the target voltage conversion module is equal to or similar to the average current of the first voltage conversion module, the conduction end point of the first driving signal of the target voltage conversion module may be shifted forward for a fourth duration, and the conduction start point of the first driving signal may be kept unchanged.
In one possible implementation, if the first voltage conversion module and the target voltage conversion module are staggered parallel voltage conversion modules, the periods of the driving signals of the target voltage conversion module and the first voltage conversion module need to be kept consistent, and in order to achieve the consistent periods of the driving signals between the two voltage conversion modules, the periods of the first driving signal and the second driving signal need to be kept unchanged. In order to realize that the period of the first driving signal and the period of the second driving signal are unchanged, it is necessary to keep the turn-off end point of the first driving signal unchanged and control the turn-off start point of the first driving signal to shift forward by a fourth duration. Specifically, the waveform diagram of the adjustment of the driving signal can be seen in fig. 6. Wherein, the solid line is the original driving signal waveform, and the dotted line is the adjusted driving signal waveform.
Referring to fig. 6, since the turn-on end point of the first driving signal is shifted forward by the fourth period of time, keeping the turn-on start point of the first driving signal unchanged, the turn-on period of the first switch Q1 is reduced by the fourth period of time. The conduction time of the first switch Q1 is reduced by a fourth time period, the energy storage time of the first inductor L1 is reduced by the fourth time period, the positive current peak value of the corresponding target voltage conversion module is reduced, the time required for consuming the electric energy stored by the inductor L1 in the conduction time of the second switch Q2 is reduced due to the reduction of the energy storage value of the inductor L1, the energy storage time of the first capacitor C1 is prolonged reversely to the energy storage time of the first inductor L1 under the condition that the conduction time of the second switch Q2 is unchanged, and the longer the reverse energy storage time of the inductor L1 is, the larger the negative current value of the target voltage conversion module is, and the negative current peak value of the target voltage conversion module is correspondingly increased. Since the positive current peak of the target voltage conversion module is reduced and the negative current peak is increased, the average current of the target voltage conversion module is reduced to be similar to or equal to the average current of the first voltage conversion module.
By adopting the scheme, the negative current is increased mainly by adjusting the first driving signal, so that the second driving signal can be kept unchanged.
In another possible implementation manner, if the first voltage conversion module and the target voltage conversion module are non-interleaved parallel voltage conversion modules, the driving signal period of the target voltage conversion module may be the same as or different from the driving signal period of the first voltage conversion module. When the driving signal period of the target voltage conversion module is the same as the driving signal period of the first voltage conversion module, the driving signal period of the target voltage conversion module needs to be kept unchanged, at the moment, the turn-off ending time point of the first driving signal is kept unchanged, and the turn-off starting point of the first driving signal is controlled to shift forward for a fourth duration; when the driving signal period of the target voltage conversion module is different from the driving signal period of the first voltage conversion module, the driving signal period of the target voltage conversion module is changed, and at this time, the turn-off duration of the first driving signal can be kept unchanged.
It should be understood that, when the period of the driving signal of the target voltage conversion module is changed, the principle of adjusting the negative current by the first driving signal is the same as the principle of adjusting the negative current when the period of the driving signal of the target voltage conversion module is unchanged, but the period of the first driving signal is reduced, which is not repeated herein.
In practical use, in order to accelerate the speed of increasing the negative current, the schemes of the second and third examples may be overlapped, that is, the conduction end point of the second driving signal of the target voltage conversion module is shifted backward for a third period of time, the conduction start point of the second driving signal is kept unchanged, and the conduction end point of the first driving signal of the target voltage conversion module is shifted forward for a fourth period of time, so that the conduction start point of the first driving signal is kept unchanged. Specifically, an adjustment waveform diagram of the driving signal can be seen in fig. 7. Wherein, the solid line is the original driving signal waveform, and the dotted line is the adjusted driving signal waveform.
Referring to fig. 7, the turn-on end point of the first driving signal of the target voltage conversion module is shifted forward by a fourth duration, the turn-on start point of the first driving signal is kept unchanged, the turn-on time of the first switch Q1 is reduced by the fourth duration, the turn-on end point of the second driving signal is shifted backward by a third duration, the turn-on start point of the second driving signal is kept unchanged, and the turn-on time of the second switch Q2 is increased by the third duration. Since the on-time of the first switch Q1 is reduced by the first time, the energy storage time of the first inductor L is reduced by the first time, the stored energy of the inductor L1 is reduced, and the positive current peak value of the corresponding target voltage conversion module is reduced. Because the conduction time of the second switch Q2 is increased by a first time, the energy storage time of the first capacitor C1 in the opposite phase direction to the first inductor L1 is prolonged, and the longer the energy storage time of the first capacitor C1 in the opposite phase direction is, the larger the negative current value of the target voltage conversion module is, and the negative current peak value of the target voltage conversion module is correspondingly increased. Since the positive current peak of the target voltage conversion module is reduced and the negative current peak is increased, the average current of the target voltage conversion module is reduced to be similar to or equal to the average current of the first voltage conversion module. The positive current is a current transmitted from the input end of the voltage conversion device 200 to the output end of the voltage conversion device 200 on the first inductor L1, and the negative current is a current transmitted from the output end of the voltage conversion device 200 to the input end of the voltage conversion device 200 on the first inductor L1.
Embodiment II,
If the average current on the target voltage conversion module is smaller than the average current of the first voltage conversion module, in order to achieve current average between the two voltage conversion modules, the average current of the target voltage conversion module needs to be increased. Several ways of reducing the negative current of the target voltage conversion module are described below in a few specific examples.
Example one
In an example one, in order to reduce the negative current of the target voltage conversion module, the average current of the target voltage conversion module is equal to or similar to the average current of the first voltage conversion module, the turn-on end point of the first driving signal in the target voltage conversion module may be shifted backward for a fifth period of time, and the turn-on start point of the first driving signal may be kept unchanged; and shifting the conduction starting point of the second driving signal in the target voltage conversion module backwards for a fifth duration, and keeping the conduction ending point of the second driving signal unchanged.
In one possible implementation, if the first voltage conversion module and the target voltage conversion module are staggered parallel voltage conversion modules, the periods of the driving signals of the target voltage conversion module and the first voltage conversion module need to be kept consistent, and in order to achieve the consistent periods of the driving signals between the two voltage conversion modules, the periods of the first driving signal and the second driving signal need to be kept unchanged. In order to realize the constant period of the first driving signal and the second driving signal, it is necessary to keep the turn-off end point of the first driving signal constant, shift the turn-off start point of the first driving signal backward for a fifth period of time, and keep the turn-off start point of the second driving signal constant, and shift the turn-off end point of the second driving signal backward for a fifth period of time. Specifically, an adjustment waveform diagram of the driving signal can be seen in fig. 8. Wherein, the solid line is the original driving signal waveform, and the dotted line is the adjusted driving signal waveform.
Referring to fig. 8, the turn-on end point of the first driving signal is shifted backward by a fifth period of time and keeps the turn-on start point of the first driving signal unchanged, the turn-on time of the first switch Q1 is increased by the fifth period of time, the turn-on start point of the second driving signal is shifted backward by the fifth period of time and keeps the turn-on end point of the second driving signal unchanged, and the turn-on time of the second switch Q2 is decreased by the fifth period of time. Since the on-time of the first switch Q1 is increased by the fifth time, the energy storage time of the first inductor L is increased by the fifth time, the stored electric energy of the inductor L1 is increased, and the positive current peak value of the corresponding target voltage conversion module is increased. Because the conduction time of the second switch Q2 is reduced by a fifth time, the energy storage time of the first capacitor C1 in the opposite phase to the first inductor L1 is reduced, and the shorter the opposite phase energy storage of the inductor L1 is, the smaller the negative current value of the target voltage conversion module is, and the negative current peak value of the target voltage conversion module is correspondingly reduced. Since the positive current peak value of the target voltage conversion module increases and the negative current peak value decreases, the average current of the target voltage conversion module increases so as to be similar to or equal to the average current of the first voltage conversion module.
In another possible implementation manner, if the first voltage conversion module and the target voltage conversion module are non-interleaved parallel voltage conversion modules, the driving signal period of the target voltage conversion module may be the same as or different from the driving signal period of the first voltage conversion module. When the target voltage conversion module obtains that the driving signal period is the same as that of the first voltage conversion module, the driving signal period of the target voltage conversion module needs to be kept unchanged, at this time, the turn-off ending time point of the first driving signal is kept unchanged, the turn-off starting point of the first driving signal is shifted backwards for a fifth duration, the turn-off starting point of the second driving signal is kept unchanged, and the turn-off ending point of the second driving signal is shifted backwards for the fifth duration; when the driving signal period of the target voltage conversion module is different from the driving signal period of the first voltage conversion module, the driving signal period of the target voltage conversion module is changed, and at this time, the turn-off duration of the first driving signal and the second driving signal can be kept unchanged.
It should be understood that when the period of the driving signal of the target voltage conversion module changes, the principle of negative current adjustment by the first driving signal and the second driving signal is the same as the negative current adjustment principle when the period of the driving signal of the target voltage conversion module is unchanged, but the period of the first driving signal is increased, and the period of the second driving signal is decreased, which is not repeated herein.
When the negative current adjustment scheme is adopted, the first time length is determined according to the difference of average currents between the target voltage conversion module and the first voltage conversion module and the inductance value of the target voltage conversion module.
Specifically, in the case where the difference between the average currents of the target voltage conversion module and the first voltage conversion module and the inductance value of the first inductor are determined, a fifth period of time required to adjust the difference between the average currents is calculated using an inductance current calculation formula.
In one possible implementation manner, if the energy storage parameter of the first inductor in the target voltage conversion module is not determined, in order to reduce the negative current of the target voltage conversion module, a closed loop adjustment manner shown in fig. 9 may be adopted, which is specifically as follows:
step 901, shifting the conduction end point of the first driving signal sent to the target voltage conversion module in the previous time backward for a sixth duration, and keeping the conduction start point of the first driving signal unchanged.
It should be noted that, when the driving signal of the target voltage conversion module is adjusted for the first time, the first driving signal sent to the target voltage conversion module at the previous time is the first driving signal sent by the controller for the first time.
Step 902, the turn-on start point of the second driving signal sent to the target voltage conversion module in the previous time is shifted backward for a sixth period of time, and the turn-on end point of the first driving signal is kept unchanged.
It should be noted that, when the driving signal of the target voltage conversion module is adjusted for the first time, the second driving signal sent to the target voltage conversion module in the previous time is the second driving signal sent by the controller for the first time.
Step 903, sending the adjusted first driving signal and the adjusted second driving signal to the target voltage conversion module.
Step 904, obtaining an output current of the target voltage conversion module, and calculating a difference between average currents of the target voltage conversion module and the first voltage conversion module.
Step 905, judging whether the difference between the average currents of the target voltage conversion module and the first voltage conversion module calculated at this time is in a preset range, if so, executing step 906; otherwise, go back to step 901.
In actual use, steps 401 and 402 may be performed j times until the condition of step 405 is satisfied. Where j is a natural number.
Step 906, using the current latest adjusted first driving signal and second driving signal as the latest driving signal of the target voltage conversion module.
It should be noted that, if the first voltage conversion module and the target voltage conversion module are staggered parallel voltage conversion modules, there is a fixed phase difference between the driving signals of the first voltage conversion module and the target voltage conversion module, and when the closed loop adjustment scheme shown in fig. 4 is executed, the driving signal of the first voltage conversion module may be adjusted according to the fixed phase deviation and then be used as the driving signal of the target voltage conversion module.
It should be understood that the principle of negative current adjustment by the closed loop circulation adjustment scheme is the same as that of the target voltage conversion module when the driving signal period is unchanged, and will not be repeated herein.
Example two
In the second example, in order to reduce the negative current of the target voltage conversion module, the average current of the target voltage conversion module is equal to or similar to the average current of the first voltage conversion module, the conduction end point of the first driving signal may be shifted backward for a seventh period of time, and the conduction start point of the first driving signal is kept unchanged, and a difference between the adjusted conduction end point of the first driving signal and the conduction start point of the second driving signal is a first preset threshold value. It should be noted that, in order to avoid that the two switches are turned on simultaneously, a difference between the conduction end point of the adjusted first driving signal and the conduction start point of the second driving signal is a first preset threshold value.
In one possible implementation, if the target voltage conversion module and the first voltage conversion module are staggered parallel voltage conversion modules, the periods of the driving signals of the first voltage conversion module and the target voltage conversion module need to be kept consistent, and in order to achieve consistent periods of the driving signals between the two voltage conversion modules, the periods of the first driving signal and the second driving signal need to be kept unchanged. In order to achieve that the periods of the first and second drive signals are unchanged, it is necessary to shift the off-end point of the first drive signal forward by a seventh period of time. Specifically, an adjustment waveform diagram of the driving signal can be seen in fig. 10. Wherein, the solid line is the original driving signal waveform, and the dotted line is the adjusted driving signal waveform.
Referring to fig. 10, when the turn-on end point of the first driving signal is shifted backward by the seventh period of time, keeping the turn-on start point of the first driving signal unchanged, the turn-on time of the first switch Q1 is increased by the seventh period of time. Because the conduction time of the second switch Q2 is prolonged by the seventh time, the energy storage time of the first inductor L1 is prolonged by the seventh time, the storage value on the inductor L1 is increased, and the positive current peak value of the target voltage conversion module is correspondingly increased. Because the positive current peak value is increased, the time required for consuming the electric energy by the inductor L1 in the conduction time of the second switch Q2 is prolonged, the time for reversely storing the energy of the first capacitor C1 to the first inductor L1 is reduced under the condition that the conduction time of the second switch Q2 is unchanged, the shorter the reverse storage time of the inductor L1 is, the smaller the negative current value of the target voltage conversion module is, and the negative current peak value of the target voltage conversion module is correspondingly reduced. Since the positive current peak value of the target voltage conversion module is increased and the negative current peak value is reduced, the average current of the target voltage conversion module is increased to be similar to or equal to the average current of the first voltage conversion module.
With the above scheme, the second driving signal can be kept unchanged because the negative current is increased mainly by adjusting the first driving signal.
In another possible implementation manner, if the first voltage conversion module and the target voltage conversion module are non-interleaved parallel voltage conversion modules, the driving signal period of the target voltage conversion module may be the same as or different from the driving signal period of the first voltage conversion module. When the driving signal period of the target voltage conversion module is the same as the driving signal period of the first voltage conversion module, the driving signal period of the target voltage conversion module needs to be kept unchanged, and at the moment, the turn-off ending time point of the first driving signal is shifted backwards and forwards for a seventh time length; when the driving signal period of the target voltage conversion module is different from the driving signal period of the first voltage conversion module, the driving signal period of the target voltage conversion module is changed, and the turn-off duration of the first driving signal can be kept unchanged.
It should be understood that, when the period of the driving signal of the target voltage conversion module is changed, the principle of adjusting the negative current by the first driving signal is the same as the principle of adjusting the negative current when the period of the driving signal of the target voltage conversion module is unchanged, but the period of the first driving signal is prolonged, and the description is not repeated here.
Example three
In the third example, in order to reduce the negative current of the target voltage conversion module, the average current of the target voltage conversion module is equal to or similar to the average current of the first voltage conversion module, the conduction end point of the second driving signal of the target voltage conversion module may be shifted forward for the eighth period of time, and the conduction start point of the second driving signal may be kept unchanged. It should be noted that, in order to avoid that the two switches are turned on simultaneously, the conduction start point of the adjusted second driving signal and the conduction end point of the first driving signal differ by a second preset threshold.
In one possible implementation, if the first voltage conversion module and the target voltage conversion module are staggered parallel voltage conversion modules, the periods of the driving signals of the target voltage conversion module and the first voltage conversion module need to be kept consistent, and in order to achieve the consistent periods of the driving signals between the two voltage conversion modules, the periods of the first driving signal and the second driving signal need to be kept unchanged. In order to realize that the period of the first driving signal and the period of the second driving signal are unchanged, it is necessary to keep the turn-off end time point of the second driving signal unchanged and control the turn-off start point of the first driving signal to shift forward by an eighth time period. Specifically, an adjustment waveform diagram of the driving signal can be seen in fig. 11. Wherein, the solid line is the original driving signal waveform, and the dotted line is the adjusted driving signal waveform.
Referring to fig. 11, since the turn-on end point of the second driving signal is shifted forward by the eighth period of time, keeping the turn-on start point of the second driving signal unchanged, the turn-on period of the second switch Q2 is reduced by the eighth period of time. Because the conduction time of the second switch Q2 is reduced by the eighth time period, the energy storage time of the first capacitor C1 in the opposite phase to the first inductor L1 is reduced, the shorter the opposite phase storage time of the inductor L1 is, the smaller the negative current value of the target voltage conversion module is, and the negative current peak value of the target voltage conversion module is correspondingly reduced. Since the positive current peak value of the target voltage conversion module is unchanged and the negative current peak value is reduced, the average current of the target voltage conversion module is increased to be similar or equal to the average current of the first voltage conversion module.
By adopting the scheme, the negative current is reduced mainly by adjusting the second driving signal, so that the first driving signal can be kept unchanged.
In another possible implementation manner, if the first voltage conversion module and the target voltage conversion module are non-interleaved parallel voltage conversion modules, the driving signal period of the target voltage conversion module may be the same as or different from the driving signal period of the first voltage conversion module. When the driving signal period of the target voltage conversion module is the same as the driving signal period of the first voltage conversion module, the driving signal period of the target voltage conversion module needs to be kept unchanged, at the moment, the turn-off ending time point of the second driving signal is kept unchanged, and the turn-off starting point of the first driving signal is controlled to shift forward for an eighth time period; when the driving signal period of the target voltage conversion module is different from the driving signal period of the first voltage conversion module, the driving signal period of the target voltage conversion module is changed, and at this time, the turn-off duration of the second driving signal can be kept unchanged.
It should be understood that, when the period of the driving signal of the target voltage conversion module changes, the principle of adjusting the negative current by the second driving signal is the same as the negative current adjustment principle when the period of the driving signal of the target voltage conversion module is unchanged, but the period of the second driving signal is reduced, which is not repeated herein.
In practical use, in order to accelerate the speed of reducing the negative current, the schemes of the second and third examples may be overlapped, that is, the conduction end point of the first driving signal of the target voltage conversion module is shifted backward by a seventh period of time, and the conduction start point of the first driving signal is kept unchanged, and the conduction end point of the second driving signal of the target voltage conversion module is shifted forward by an eighth period of time, and the conduction start point of the second driving signal is kept unchanged. Specifically, an adjustment waveform diagram of the driving signal can be seen in fig. 12. Wherein, the solid line is the original driving signal waveform, and the dotted line is the adjusted driving signal waveform.
Referring to fig. 12, the turn-on end point of the first driving signal of the target voltage conversion module is shifted backward by a seventh period of time, and the turn-on start point of the first driving signal is kept unchanged, so that the turn-on time of the first switch Q1 is increased by the seventh period of time. The conduction end point of the second driving signal of the target voltage conversion module is shifted forward by an eighth time period, and the conduction start point of the second driving signal is kept unchanged, so that the conduction time of the second switch Q2 is reduced by the eighth time period. Since the on-time of the first switch Q1 is increased by the seventh time, the energy storage time of the first inductor L is increased by the seventh time, the stored energy of the inductor L1 is increased, and the positive current peak value of the corresponding target voltage conversion module is increased. Because the conduction time of the second switch Q2 is reduced by the eighth time, the energy storage time of the first capacitor C1 in the opposite phase to the first inductor L1 is reduced, and the shorter the energy storage time of the first capacitor L1 in the opposite phase is, the smaller the negative current value of the target voltage conversion module is, and the negative current peak value of the target voltage conversion module is correspondingly reduced. Since the positive current peak value of the target voltage conversion module increases and the negative current peak value decreases, the average current of the target voltage conversion module increases so as to be similar to or equal to the average current of the first voltage conversion module.
Based on the same inventive concept, the embodiment of the application also provides a current equalizing method of the voltage conversion device, which is applied to the voltage conversion device, wherein the voltage conversion device comprises a plurality of voltage conversion modules connected in parallel. It will be appreciated that the voltage conversion device may be the voltage conversion device shown in fig. 2. Specifically, referring to fig. 13, the method specifically includes the steps of:
step 1301, detecting the current of each voltage conversion module. Specifically, the current of the voltage conversion module may be obtained by a monitoring system of the voltage conversion device, or may be obtained by separately configuring the detection device.
Step 1302, calculating an average current of each voltage conversion module according to the current of each voltage conversion module.
And step 1303, when it is determined that the difference between the average currents of the target voltage conversion module and the first voltage conversion module exceeds the preset interval, adjusting the negative current of the target voltage conversion module so that the difference between the average currents of the target voltage conversion module and the first voltage conversion module is in the preset interval. The first voltage conversion module is determined according to the current of each voltage conversion module, and the target voltage conversion module is any one voltage conversion module except the first voltage conversion module in the plurality of voltage conversion modules.
Specifically, an average current of each voltage conversion module is calculated according to the current of each voltage conversion module, and a first voltage conversion module is determined according to the average current of each voltage conversion module. The first voltage conversion module may be a module outputting a minimum average current, or a module outputting a maximum average current, or other voltage conversion modules.
In specific implementation, adjusting the negative current of the target voltage conversion module includes: and adjusting the driving signal output to the target voltage conversion module to adjust the negative current of the target voltage conversion module.
Specifically, the structure of the voltage conversion module is shown in fig. 1, and the description thereof is not repeated here.
In one possible implementation, if the average current of the target voltage conversion module is greater than the average current of the first voltage conversion module, adjusting the negative current of the target voltage conversion module includes: the driving signal of the target voltage conversion module is adjusted to increase the negative current of the target voltage conversion module.
In one possible implementation, adjusting the driving signal of the target voltage conversion module includes: shifting forward the conduction end point of the first driving signal in the target voltage conversion module for a first duration, and keeping the conduction start point of the first driving signal unchanged; and shifting the conduction starting point of the second driving signal in the target voltage conversion module forward by a first time length, and keeping the conduction ending point of the target voltage conversion module unchanged.
In one possible implementation, the first time period is determined according to a difference in average current between the target voltage conversion module and the first voltage conversion module and an inductance value of the target voltage conversion module.
In one possible implementation, adjusting the driving signal of the target voltage conversion module includes:
shifting forward the conduction end point of the first driving signal sent to the target voltage conversion module for i times for a second time period, and keeping the conduction start point of the first driving signal unchanged; shifting forward the conduction start point of the second driving signal sent to the target voltage conversion module for i times for a second duration, and keeping the conduction end point of the second driving signal unchanged; wherein i is a positive integer; and sending the adjusted first driving signal and second driving signal to the target voltage conversion module, wherein the difference of average currents between the target voltage conversion module and the first voltage conversion module after the first driving signal and the second driving signal are adjusted is in a preset interval.
When i is 1, the first driving signal sent to the target voltage conversion module at the previous time is the first driving signal sent by the controller for the first time, and the second driving signal sent to the target voltage conversion module at the previous time is the second driving signal sent by the controller for the first time.
In one possible implementation, adjusting the driving signal of the target voltage conversion module includes: and shifting the conduction end point of the second driving signal of the target voltage conversion module backwards for a third duration, and keeping the conduction start point of the second driving signal unchanged.
In one possible implementation, adjusting the driving signal of the target voltage conversion module includes: and shifting forward the conduction end point of the first driving signal of the target voltage conversion module for a fourth duration, and keeping the conduction start point of the first driving signal unchanged.
In one possible implementation manner, if the average current of the target voltage conversion module is smaller than the average current of the first voltage conversion module and the average current output by the first voltage conversion module is smaller than the preset threshold, adjusting the negative current of the target voltage conversion module includes: the driving signal of the target voltage conversion module is adjusted to reduce the negative current of the target voltage conversion module.
In one possible implementation, adjusting the driving signal of the target voltage conversion module includes: shifting the conduction end point of the first driving signal in the target voltage conversion module backwards for a fifth duration, and keeping the conduction start point of the first driving signal unchanged; and shifting the conduction starting point of the second driving signal in the target voltage conversion module backwards for a fifth duration, and keeping the conduction ending point of the second driving signal unchanged.
In one possible implementation, adjusting the driving signal of the target voltage conversion module includes:
shifting the conduction end point of the first driving signal sent to the target voltage conversion module for j times for a sixth time, and keeping the conduction start point of the first driving signal unchanged; shifting the conduction starting point of the second driving signal sent to the target voltage conversion module in the previous time backward for j times for a sixth time period, and keeping the conduction ending point of the first driving signal unchanged; j is a positive integer; and sending the adjusted first driving signal and second driving signal to the target voltage conversion module, wherein the difference of average currents between the target voltage conversion module and the first voltage conversion module after the first driving signal and the second driving signal are adjusted is in a preset interval.
When j is 1, the first driving signal sent to the target voltage conversion module at the previous time is the first driving signal sent by the controller for the first time, and the second driving signal sent to the target voltage conversion module at the previous time is the second driving signal sent by the controller for the first time.
In one possible implementation, adjusting the driving signal of the target voltage conversion module includes: and shifting the conduction ending point of the first driving signal of the target voltage conversion module backwards for a seventh time period, keeping the conduction starting point of the first driving signal unchanged, and adjusting the phase difference between the conduction ending point of the first driving signal and the conduction starting point of the second driving signal by a first preset threshold value.
In one possible implementation, adjusting the driving signal of the target voltage conversion module includes: shifting forward the conduction ending point of the second driving signal of the target voltage conversion module for an eighth time period, keeping the conduction starting point of the second driving signal unchanged, and adjusting the phase difference between the conduction starting point of the second driving signal and the conduction ending point of the first driving signal by a second preset threshold value.
In the above implementation manner, if the first voltage conversion module and the target voltage conversion module are staggered parallel voltage conversion modules, the periods of the first driving signal and the second driving signal remain unchanged.
Specifically, when the periods of the first driving signal and the second driving signal are unchanged, waveform change diagrams of the adjustment of the first driving signal and the second driving signal can be seen in fig. 3-11, and the description is not repeated here.
The embodiment of the application also provides a current equalizing device of the voltage converting device based on the embodiment, and the device can be applied to the voltage converting device shown in fig. 2 for realizing the current equalizing method of the voltage converting device. Referring to fig. 14, the apparatus 1400 includes: a communication module 1401, a processor 1402, and a memory 1403.
The communication module 1401 and the memory 1403 are connected to the processor 1402. Optionally, the communication module 1401 and the memory 1003 may be interconnected with the processor 1402 by a bus; the bus may be a peripheral component interconnect standard (peripheral component interconnect, PCI) bus or an extended industry standard architecture (extended industry standard architecture, EISA) bus, or the like. The buses may be divided into address buses, data buses, control buses, etc. For ease of illustration, only one thick line is shown in fig. 14, but not only one bus or one type of bus.
The communication module 1401 is used to communicate with other devices. By way of example, the communication module 1401 may include a communication interface and a wireless communication module. Wherein the communication interface is used for communicating with other components in the voltage conversion device.
The processor 1402 is configured to implement the current equalizing method of the voltage converting apparatus according to the embodiment shown in fig. 13, and specifically, reference may be made to the description in the above embodiment, which is not repeated herein. Alternatively, the processor 1402 may be a central processing unit (central processing unit, CPU), digital signal processor (digital signal processor, DSP) or other hardware chip. The hardware chip may be an application-specific integrated circuit (ASIC), a programmable logic device (programmable logic device, PLD), or a combination thereof. The PLD may be a complex programmable logic device (complex programmable logic device, CPLD), a field-programmable gate array (field-programmable gate array, FPGA), general-purpose array logic (generic array logic, GAL), or any combination thereof. The processor 1402 may be implemented by hardware when implementing the above functions, or may be implemented by executing corresponding software by hardware.
The memory 1403 is used for storing program instructions, data, and the like. Illustratively, in the present embodiment, the memory 1403 stores program instructions and data therein. In particular, the program instructions may include program code comprising instructions for computer operations. The memory 1403 may include random access memory (random access memory, RAM) and may also include non-volatile memory (non-volatile memory), such as at least one disk memory. The processor 1402 executes the program stored in the memory 1403, and implements the above functions through the above components, thereby finally implementing the current equalizing method of the voltage converting apparatus provided in the above embodiment.
It is understood that the memory 1403 in fig. 14 of the present application may be either volatile memory or nonvolatile memory, or may include both volatile and nonvolatile memory. The nonvolatile Memory may be a Read-Only Memory (ROM), a Programmable ROM (PROM), an Erasable PROM (EPROM), an Electrically Erasable EPROM (EEPROM), or a flash Memory. The volatile memory may be random access memory (Random Access Memory, RAM) which acts as an external cache. By way of example, and not limitation, many forms of RAM are available, such as Static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double Data Rate SDRAM (Double Data Rate SDRAM), enhanced SDRAM (ESDRAM), synchronous DRAM (SLDRAM), and Direct RAM (DR RAM). It should be noted that the memory of the systems and methods described herein is intended to comprise, without being limited to, these and any other suitable types of memory.
Based on the above embodiments, the embodiments of the present application further provide a computer readable storage medium, where a computer program is stored, and when the computer program is executed by a computer, the computer is caused to execute the current sharing method of the voltage conversion device provided in the above embodiments.
It will be appreciated by those skilled in the art that embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to the application. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
It will be apparent to those skilled in the art that various modifications and variations can be made in the present application without departing from the scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims and the equivalents thereof, the present application is intended to cover such modifications and variations.
Claims (30)
- The voltage conversion device with current sharing is characterized by comprising a plurality of voltage conversion modules, a detection unit and a controller which are connected in parallel;one end of each voltage conversion module is connected with the input end of the voltage conversion device, the other end of each voltage conversion module is connected with the output end of the voltage conversion device, and each voltage conversion module is used for receiving a driving signal sent by the controller, converting the input voltage of the voltage conversion device into a first voltage according to the driving signal and splitting the input current of the voltage conversion device;the detection unit is used for detecting the current of each voltage conversion module and outputting the detected current to the controller;the controller is connected with each voltage conversion module, and is used for outputting a driving signal for each voltage conversion module, and adjusting the negative current of the target voltage conversion module when the difference of the average current between the target voltage conversion module and the first voltage conversion module exceeds the preset interval according to the current detected by the detection unit; the first voltage conversion module is determined according to the current detected by the detection unit, and the target voltage conversion module is any one voltage conversion module except the first voltage conversion module in the plurality of voltage conversion modules.
- The voltage conversion device of claim 1, wherein each of the voltage conversion modules comprises: a first inductor, a first switch and a second switch;the first end of the first inductor is connected with a first end point of the input end of the voltage conversion device, and the second end of the first inductor is respectively connected with a first electrode of the first switch and a second electrode of the second switch;the second electrode of the first switch is respectively connected with the second endpoint of the input end of the voltage conversion device and the second endpoint of the output end of the voltage conversion device;the first electrode of the second switch is connected with a first end point of the output end of the voltage conversion device;the controller is used for outputting a first driving signal to the first switch and outputting a second driving signal to the second switch, and the first driving signal and the second driving signal form a driving signal of the voltage conversion module.
- The voltage conversion device according to claim 2, wherein the controller is configured to adjust the driving signal output to the target voltage conversion module when it is determined that the difference between the average currents of the target voltage conversion module and the first voltage conversion module exceeds the preset interval if the average current of the target voltage conversion module is greater than the average current of the first voltage conversion module.
- A voltage conversion device according to claim 3, wherein the controller is configured to: when the difference of average currents between the target voltage conversion module and the first voltage conversion module exceeds the preset interval, shifting forward a conduction ending point of a first driving signal in the target voltage conversion module for a first duration, and keeping the conduction starting point of the first driving signal unchanged;and shifting the conduction starting point of the second driving signal in the target voltage conversion module forward for the first duration, and keeping the conduction ending point of the target voltage conversion module unchanged.
- The voltage conversion device of claim 4, wherein the first time period is determined based on a difference in average current between the target voltage conversion module and the first voltage conversion module and an inductance value of the target voltage conversion module.
- The voltage conversion device according to claim 3, wherein the controller shifts a conduction end point of a first driving signal previously transmitted to the target voltage conversion module forward by i times for a second period of time when it is determined that a difference in average current between the target voltage conversion module and the first voltage conversion module exceeds the preset interval, and keeps a conduction start point of the first driving signal unchanged;Shifting forward the conduction start point of a second driving signal sent to the target voltage conversion module for i times by the second duration, and keeping the conduction end point of the second driving signal unchanged; wherein i is a positive integer;the adjusted first driving signal and the second driving signal are sent to the target voltage conversion module, and the difference of average currents between the target voltage conversion module after the first driving signal and the second driving signal are adjusted and the first voltage conversion module is in the preset interval;when i is 1, the first driving signal sent to the target voltage conversion module at the previous time is the first driving signal sent by the controller for the first time, and the second driving signal sent to the target voltage conversion module at the previous time is the second driving signal sent by the controller for the first time.
- A voltage conversion device according to claim 3, wherein the controller is configured to: and when the difference of the average currents between the target voltage conversion module and the first voltage conversion module exceeds the preset interval, shifting the conduction ending point of the second driving signal of the target voltage conversion module backwards for a third duration, and keeping the conduction starting point of the second driving signal unchanged.
- The voltage conversion device according to claim 3 or 7, wherein the controller is configured to: and shifting forward the conduction end point of the first driving signal of the target voltage conversion module for a fourth duration, and keeping the conduction start point of the first driving signal unchanged.
- The voltage conversion device according to claim 2, wherein the controller is configured to adjust the driving signal output to the target voltage conversion module when the difference between the average currents of the target voltage conversion module and the first voltage conversion module exceeds the preset interval, if the average current of the target voltage conversion module is smaller than the average current of the first voltage conversion module and the average current output by the first voltage conversion module is smaller than a preset threshold, the preset threshold being a current stress of the target voltage conversion module.
- The voltage conversion device of claim 9, wherein the controller is configured to: when the difference of average currents between the target voltage conversion module and the first voltage conversion module exceeds the preset interval, shifting the conduction ending point of the first driving signal in the target voltage conversion module backwards for a fifth duration, and keeping the conduction starting point of the first driving signal unchanged;And shifting the conduction starting point of the second driving signal in the target voltage conversion module backwards by the fifth time period, and keeping the conduction ending point of the second driving signal unchanged.
- The voltage converting apparatus according to claim 9, wherein the controller shifts a turn-on end point of a first driving signal previously transmitted to the target voltage converting module backward by j sixth time periods and keeps a turn-on start point of the first driving signal unchanged when it is determined that a difference in average current between the target voltage converting module and the first voltage converting module exceeds the preset interval;shifting the conduction start point of the second driving signal sent to the target voltage conversion module for j times by the sixth time, and keeping the conduction end point of the first driving signal unchanged; j is a positive integer;the adjusted first driving signal and the second driving signal are sent to the target voltage conversion module, and the difference of average currents between the target voltage conversion module and the first voltage conversion module after the first driving signal and the second driving signal are adjusted is in the preset interval;when j is 1, the first driving signal sent to the target voltage conversion module at the previous time is the first driving signal sent by the controller for the first time, and the second driving signal sent to the target voltage conversion module at the previous time is the second driving signal sent by the controller for the first time.
- The voltage conversion device of claim 9, wherein the controller is configured to: when it is determined that the difference of average currents between the target voltage conversion module and the first voltage conversion module exceeds the preset interval, a conduction ending point of a first driving signal of the target voltage conversion module is shifted backward for a seventh duration, a conduction starting point of the first driving signal is kept unchanged, and a difference of a first preset threshold value between the conduction ending point of the adjusted first driving signal and the conduction starting point of the second driving signal is kept unchanged.
- The voltage conversion device according to claim 9 or 12, wherein the controller is configured to: shifting forward the conduction ending point of the second driving signal of the target voltage conversion module for an eighth time period, keeping the conduction starting point of the second driving signal unchanged, and adjusting the phase difference between the conduction starting point of the second driving signal and the conduction ending point of the first driving signal by a second preset threshold value.
- The voltage conversion device according to any one of claims 2 to 13, wherein if the first voltage conversion module and the target voltage conversion module are staggered parallel voltage conversion modules, the period of the first driving signal and the second driving signal remains unchanged.
- A current equalizing method of a voltage conversion device, which is applied to the voltage conversion device, wherein the voltage conversion device comprises a plurality of voltage conversion modules connected in parallel, and the method comprises the following steps:detecting a current of each voltage conversion module;calculating the average current of each voltage conversion module according to the current of each voltage conversion module;when the difference of average currents between the target voltage conversion module and the first voltage conversion module is determined to be beyond the preset interval, the negative current of the target voltage conversion module is adjusted; the first voltage conversion module is determined according to the average current of each voltage conversion module, and the target voltage conversion module is any one voltage conversion module except the first voltage conversion module in the plurality of voltage conversion modules.
- The method of claim 15, wherein the adjusting the negative current of the target voltage conversion module comprises:adjusting a driving signal output to the target voltage conversion module;each voltage conversion module comprises a first inductor, a first switch and a second switch;the first end of the first inductor is connected with a first end point of the input end of the voltage conversion device, and the second end of the first inductor is respectively connected with a first electrode of the first switch and a second electrode of the second switch;The second electrode of the first switch is respectively connected with the second endpoint of the input end of the voltage conversion device and the second endpoint of the output end of the voltage conversion device;the first electrode of the second switch is connected with a first end point of the output end of the voltage conversion device;the first driving signal received by the first switch and the second driving signal received by the second switch form the driving signal of the voltage conversion module.
- The method of claim 16, wherein adjusting the negative current of the target voltage conversion module if the average current of the target voltage conversion module is greater than the average current of the first voltage conversion module comprises:and adjusting a driving signal of the target voltage conversion module.
- The method of claim 17, wherein the adjusting the drive signal of the target voltage conversion module comprises:shifting forward the conduction end point of the first driving signal in the target voltage conversion module for a first duration, and keeping the conduction start point of the first driving signal unchanged;and shifting the conduction starting point of the second driving signal in the target voltage conversion module forward for the first duration, and keeping the conduction ending point of the target voltage conversion module unchanged.
- The method of claim 18, wherein the first time period is determined based on a difference in average current between the target voltage conversion module and the first voltage conversion module and an inductance value of the target voltage conversion module.
- The method of claim 17, wherein the adjusting the drive signal of the target voltage conversion module comprises:shifting forward the conduction end point of the first driving signal sent to the target voltage conversion module for i times for a second time period, and keeping the conduction start point of the first driving signal unchanged;shifting forward the conduction start point of a second driving signal sent to the target voltage conversion module for i times by the second duration, and keeping the conduction end point of the second driving signal unchanged; wherein i is a positive integer;the adjusted first driving signal and the second driving signal are sent to the target voltage conversion module, and the difference of average currents between the target voltage conversion module after the first driving signal and the second driving signal are adjusted and the first voltage conversion module is in the preset interval;when i is 1, the first driving signal sent to the target voltage conversion module at the previous time is the first driving signal sent by the controller for the first time, and the second driving signal sent to the target voltage conversion module at the previous time is the second driving signal sent by the controller for the first time.
- The method of claim 17, wherein the adjusting the drive signal of the target voltage conversion module comprises:and shifting the conduction ending point of the second driving signal of the target voltage conversion module backwards for a third duration, and keeping the conduction starting point of the second driving signal unchanged.
- The method of claim 17, wherein the adjusting the drive signal of the target voltage conversion module comprises:and shifting forward the conduction end point of the first driving signal of the target voltage conversion module for a fourth duration, and keeping the conduction start point of the first driving signal unchanged.
- The method of claim 17, wherein adjusting the negative current of the target voltage conversion module if the average current of the target voltage conversion module is less than the average current of the first voltage conversion module comprises:and adjusting a driving signal of the target voltage conversion module.
- The method of claim 23, wherein the adjusting the drive signal of the target voltage conversion module comprises:shifting the conduction end point of the first driving signal in the target voltage conversion module backwards for a fifth duration, and keeping the conduction start point of the first driving signal unchanged;And shifting the conduction starting point of the second driving signal in the target voltage conversion module backwards by the fifth time period, and keeping the conduction ending point of the second driving signal unchanged.
- The method of claim 23, wherein the adjusting the drive signal of the target voltage conversion module comprises:shifting the conduction end point of the first driving signal sent to the target voltage conversion module for j times for a sixth time, and keeping the conduction start point of the first driving signal unchanged;shifting the conduction start point of the second driving signal sent to the target voltage conversion module for j times by the sixth time, and keeping the conduction end point of the first driving signal unchanged; j is a positive integer;the adjusted first driving signal and the second driving signal are sent to the target voltage conversion module, and the difference of average currents between the target voltage conversion module and the first voltage conversion module after the first driving signal and the second driving signal are adjusted is in the preset interval;when j is 1, the first driving signal sent to the target voltage conversion module at the previous time is the first driving signal sent by the controller for the first time, and the second driving signal sent to the target voltage conversion module at the previous time is the second driving signal sent by the controller for the first time.
- The method of claim 23, wherein the adjusting the drive signal of the target voltage conversion module comprises:and shifting the conduction ending point of the first driving signal of the target voltage conversion module backwards for a seventh time period, keeping the conduction starting point of the first driving signal unchanged, and adjusting the phase difference between the conduction ending point of the first driving signal and the conduction starting point of the second driving signal by a first preset threshold value.
- The method of claim 23, wherein the adjusting the drive signal of the target voltage conversion module comprises:shifting forward the conduction ending point of the second driving signal of the target voltage conversion module for an eighth time period, keeping the conduction starting point of the second driving signal unchanged, and adjusting the phase difference between the conduction starting point of the second driving signal and the conduction ending point of the first driving signal by a second preset threshold value.
- The method of any of claims 16-27, wherein if the first voltage conversion module and the target voltage conversion module are interleaved voltage conversion modules, the period of the first drive signal and the second drive signal remains unchanged.
- A current sharing device of a voltage conversion device, comprising:a memory for storing program instructions;the communication module is used for receiving and sending data;a processor for invoking said program instructions stored in said memory to perform the method of any of claims 15-28.
- A computer storage medium having a computer program stored therein, which when executed by a computer causes the computer to perform the method of any of claims 15-28.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/CN2021/112283 WO2023015523A1 (en) | 2021-08-12 | 2021-08-12 | Voltage conversion apparatus having current equalization function, current equalization method and apparatus, and medium |
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| Publication Number | Publication Date |
|---|---|
| CN117501607A true CN117501607A (en) | 2024-02-02 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202180099574.7A Pending CN117501607A (en) | 2021-08-12 | 2021-08-12 | Voltage conversion device with current sharing function, current sharing method, device and medium |
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| Country | Link |
|---|---|
| CN (1) | CN117501607A (en) |
| WO (1) | WO2023015523A1 (en) |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7170764B2 (en) * | 2004-02-24 | 2007-01-30 | Vlt, Inc. | Adaptively configured voltage transformation module array |
| CN104980015B (en) * | 2015-07-03 | 2018-04-06 | 哈尔滨工业大学深圳研究生院 | The electric current difference control method of the DC/DC converters of input series and output parallel |
| CN105406719B (en) * | 2015-12-02 | 2018-03-13 | 中国电子科技集团公司第四十一研究所 | The device and its current equalizing method flowed applied to programme-controlled dc power wired in parallel |
| CN107769556B (en) * | 2017-11-01 | 2019-09-10 | 广州金升阳科技有限公司 | Synchronous rectification BOOST converter, synchronous commutating control circuit |
| CN112511005B (en) * | 2021-02-03 | 2021-06-01 | 深圳市正浩创新科技有限公司 | Bidirectional DC/DC converter and energy storage system |
-
2021
- 2021-08-12 CN CN202180099574.7A patent/CN117501607A/en active Pending
- 2021-08-12 WO PCT/CN2021/112283 patent/WO2023015523A1/en unknown
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| WO2023015523A1 (en) | 2023-02-16 |
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