CN113691105A - Balance bridge voltage-sharing control method and power supply - Google Patents
Balance bridge voltage-sharing control method and power supply Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
- H02M1/088—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices
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Abstract
The invention is suitable for the technical field of power supplies, and provides a balance bridge voltage-sharing control method and a power supply, wherein the method comprises the following steps: acquiring the pressure difference between a positive bus and a negative bus corresponding to the balance bridge; determining a duty ratio regulating quantity according to the pressure difference between the positive bus and the negative bus; if the duty ratio regulating quantity is larger than a preset threshold value, controlling the action of an upper bridge arm switching tube of the balance bridge according to the duty ratio regulating quantity; if the duty ratio regulating quantity is not larger than the preset threshold value, controlling the action of a lower bridge arm switching tube of the balance bridge according to the duty ratio regulating quantity; the upper bridge arm switching tube and the lower bridge arm switching tube are in non-complementary conduction. According to the invention, the upper bridge arm or the lower bridge arm of the balance bridge is controlled according to the voltage difference between the positive bus and the negative bus and referring to the actual requirement, and the upper bridge arm and the lower bridge arm do not need complementary control, so that the current flowing through the inductance of the balance bridge is reduced, and the loss of the inductance of the balance bridge is reduced.
Description
Technical Field
The invention belongs to the technical field of power supplies, and particularly relates to a balance bridge voltage-sharing control method and a power supply.
Background
In order to prevent the bus voltage of the power supply from deviating, a balance bridge is usually arranged between the positive bus and the negative bus to equalize the voltage of the positive bus and the negative bus, and reference is made to fig. 1.
In the prior art, the duty ratio of the switching tubes of the upper and lower bridge arms of the balance bridge is usually set to about 50%, and the upper and lower bridge arms are complementarily output. For example, when the positive bus voltage is higher, the on-time of the upper bridge arm switching tube is increased, and the on-time of the lower bridge arm switching tube is reduced. And otherwise, reducing the on-time of the upper bridge arm switching tube and increasing the on-time of the lower bridge arm switching tube.
Because the duty ratio of the switching tubes of the upper bridge arm and the lower bridge arm is set to be about 50%, the current flowing through the balance bridge inductor is large, and the loss of the balance bridge inductor is large.
Disclosure of Invention
In view of this, the embodiment of the invention provides a balance bridge voltage-sharing control method and a power supply, so as to solve the problem that in the prior art, the inductance loss of a balance bridge is large because the duty ratio of switching tubes of upper and lower bridge arms of the balance bridge is set to about 50%.
The first aspect of the embodiment of the invention provides a balance bridge voltage-sharing control method, which comprises the following steps:
acquiring the pressure difference between a positive bus and a negative bus corresponding to the balance bridge;
determining a duty ratio regulating quantity according to the pressure difference between the positive bus and the negative bus;
if the duty ratio regulating quantity is larger than a preset threshold value, controlling the action of an upper bridge arm switching tube of the balance bridge according to the duty ratio regulating quantity;
if the duty ratio regulating quantity is not larger than the preset threshold value, controlling the action of a lower bridge arm switching tube of the balance bridge according to the duty ratio regulating quantity
The upper bridge arm switching tube and the lower bridge arm switching tube are in non-complementary conduction.
A second aspect of the embodiments of the present invention provides a power supply control device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, where the processor executes the computer program to implement the steps of the balanced bridge voltage-sharing control method according to the first aspect of the embodiments of the present invention.
A third aspect of the embodiments of the present invention provides a computer-readable storage medium, where a computer program is stored, and when the computer program is executed by a processor, the steps of the method for controlling voltage sharing of a balance bridge according to the first aspect of the embodiments of the present invention are implemented.
A fourth aspect of an embodiment of the present invention provides a power supply, including: a positive bus, a negative bus, a positive bus capacitance, a negative bus capacitance, a balance bridge inductance, and a power control apparatus as provided in the second aspect of the embodiments of the present invention;
the first end of the positive bus capacitor is connected with the positive bus, and the second end of the positive bus capacitor is connected with the first end of the negative bus capacitor; the second end of the negative bus capacitor is connected with the negative bus;
the first end of the balance bridge is connected with the positive bus, the second end of the balance bridge is connected with the negative bus, and the midpoint of the balance bridge is connected with the connection point of the positive bus capacitor and the negative bus capacitor through a balance bridge inductor;
the power control device is connected with the balance bridge.
The embodiment of the invention provides a balance bridge voltage-sharing control method and a power supply, wherein the method comprises the following steps: acquiring the pressure difference between a positive bus and a negative bus corresponding to the balance bridge; determining a duty ratio regulating quantity according to the pressure difference between the positive bus and the negative bus; if the duty ratio regulating quantity is larger than a preset threshold value, controlling the action of an upper bridge arm switching tube of the balance bridge according to the duty ratio regulating quantity; and if the duty ratio regulating quantity is not greater than the preset threshold value, controlling the action of a lower bridge arm switching tube of the balance bridge according to the duty ratio regulating quantity. According to the embodiment of the invention, the upper bridge arm or the lower bridge arm of the balance bridge is controlled according to the pressure difference between the positive bus and the negative bus and by combining with actual requirements, complementary control is not needed for the upper bridge arm and the lower bridge arm, the current flowing through the inductance of the balance bridge is reduced, and the loss of the inductance of the balance bridge is reduced.
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In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
FIG. 1 is a topology diagram of a balance bridge;
FIG. 2 is a modulation waveform diagram corresponding to a balance bridge voltage-sharing control method in the prior art;
fig. 3 is a schematic flow chart illustrating an implementation process of a balance bridge voltage-sharing control method according to an embodiment of the present invention;
fig. 4 is a modulation waveform diagram corresponding to the balance bridge voltage-sharing control method provided in the embodiment of the present invention;
fig. 5 is a modulation waveform diagram corresponding to another balance bridge control method according to an embodiment of the present invention;
fig. 6 is a schematic diagram of a balance bridge voltage-sharing control device provided in an embodiment of the present invention;
fig. 7 is a schematic diagram of a power control apparatus provided by an embodiment of the present invention;
fig. 8 is a schematic diagram of a power supply provided by an embodiment of the invention.
Detailed Description
In the following description, for purposes of explanation and not limitation, specific details are set forth, such as particular system structures, techniques, etc. in order to provide a thorough understanding of the embodiments of the invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present invention with unnecessary detail.
In order to explain the technical means of the present invention, the following description will be given by way of specific examples.
Referring to fig. 1, fig. 1 shows a topology of a balanced bridge 1.
When the upper arm switching tube Q1 of the balance bridge 1 is turned on, the positive BUS + charges the negative BUS capacitor C2 through the balance bridge inductor L1, the absolute value of the negative BUS voltage increases, and the absolute value of the positive BUS voltage decreases. When the lower arm switching tube Q2 is turned on, the negative bus capacitor C2 discharges through the lower arm switching tube Q2, the absolute value of the positive bus voltage increases, and the absolute value of the negative bus voltage decreases.
In the prior art, the duty ratio of the switching tubes (Q1 and Q2) of the upper and lower arms of the balance bridge 1 is usually set to about 50%, the upper and lower arms are complementarily output, and the voltage equalizing control of the bus is performed. For example, referring to fig. 2, when the absolute value of the positive BUS voltage is high, the on time of upper arm switching tube Q1 is increased, and the on time of lower arm switching tube Q2 is decreased, so that the electric energy of positive BUS bar + is transferred to negative BUS bar-, and the absolute value of the positive BUS voltage is decreased. On the contrary, when the absolute value of the negative bus voltage is high, the on time of the upper arm switch tube Q1 is reduced, and the on time of the lower arm switch tube Q2 is increased.
Because the duty ratio of the switching tubes (Q1 and Q2) of the upper bridge arm and the lower bridge arm is set to be about 50%, the duty ratio is large, and the regulating quantity is large, the current flowing through the balance bridge inductor L1 is large, and the loss of the balance bridge inductor L1 is large. Meanwhile, the current ripple flowing through the balance bridge inductor L1 is large, which causes the fluctuation of the midpoint voltage of the bus to be large and unstable.
Based on the above problem, referring to fig. 3, an embodiment of the present invention provides a balance bridge voltage-sharing control method, including:
s101: acquiring the pressure difference between a positive bus and a negative bus corresponding to the balance bridge;
s102: determining a duty ratio regulating quantity according to the pressure difference between the positive bus and the negative bus;
s103: if the duty ratio regulating quantity is larger than a preset threshold value, controlling the action of an upper bridge arm switching tube of the balance bridge according to the duty ratio regulating quantity;
s104: if the duty ratio regulating quantity is not larger than the preset threshold value, controlling the action of a lower bridge arm switching tube of the balance bridge according to the duty ratio regulating quantity; the upper bridge arm switching tube and the lower bridge arm switching tube are in non-complementary conduction.
In the embodiment of the invention, the pressure difference of the positive bus and the negative bus is determined, the duty ratio regulating quantity is determined according to the pressure difference of the positive bus and the negative bus, only the upper bridge arm or only the lower bridge arm is regulated according to the duty ratio regulating quantity, and the upper bridge arm switching tube Q1 and the lower bridge arm switching tube Q2 do not need complementary conduction, so that the switching-on time of the switching tubes can be effectively reduced, the current flowing through the balance bridge inductor is reduced, the loss of the balance bridge inductor is reduced, and the cost of the inductor is favorably reduced. Meanwhile, the duty ratio of the upper and lower tubes of the balance bridge is smaller, the current ripple of the inductance of the balance bridge is smaller, the midpoint potential of the bus is more stable, and the stability of the power supply is improved.
In some embodiments, S102 may include:
s1021: obtaining the inductance current value of the balance bridge inductance corresponding to the balance bridge;
s1022: and determining the duty ratio regulating quantity according to the inductance current value and the pressure difference between the positive bus and the negative bus.
According to the embodiment of the invention, the duty ratio regulating quantity is determined by combining the inductance current value and the pressure difference between the positive bus and the negative bus according to the principle of the balance bridge, the duty ratio regulating quantity result is more accurate, and further the control of the balance bridge is more accurate.
In some embodiments, S1022 may include:
1. inputting the pressure difference between the positive bus and the negative bus into a first controller to obtain a reference current value;
2. and subtracting the inductance current value from the reference current value to obtain a current error value, and inputting the current error value into the second controller to obtain the duty ratio regulating quantity.
In the embodiment of the invention, the inverter is regulated by adopting double-loop control, and the current flowing through the balance bridge inductor is regulated according to the actual energy requirement, so that the control is more accurate.
In some embodiments, the preset threshold may be 0.
In the embodiment of the invention, when the duty ratio regulating quantity is positive, the upper bridge arm switching tube Q1 is controlled to be switched on; when the duty ratio regulating quantity is negative, controlling the switching tube Q2 of the lower bridge arm to be conducted; according to actual requirements, only the upper bridge arm switching tube Q1 is controlled to be conducted, or the lower bridge arm switching tube Q2 is controlled to be conducted, the duty ratio of the switching tubes does not need to be about 50%, and only the corresponding switching tubes need to be controlled to be conducted according to the pressure difference of the positive bus and the negative bus. For example, referring to fig. 4, when the absolute value of the positive bus voltage is large, the upper arm switching tube Q1 is controlled to be on only at a duty ratio of 15%, the electric energy of the positive bus is transferred to the negative bus, and the absolute value of the positive bus voltage is lowered to reach balance. When the absolute value of the negative bus voltage is large, the lower bridge arm switching tube Q2 is controlled to be conducted only by 15% of duty ratio, the absolute value of the negative bus voltage is reduced, and balance is achieved.
According to the embodiment of the invention, the duty ratio of the upper and lower bridge arm switching tubes (Q1 and Q2) of the balance bridge is set to about 0%, complementary conduction is not needed, the current flowing through the balance bridge inductor is greatly reduced, and the loss of the balance bridge inductor is reduced. Meanwhile, the duty ratio of the switching tube is small, the energy exchange between the positive bus and the negative bus is smoother, the adjustment is more accurate, the current ripple flowing through the balance bridge inductor is smaller, the potential of the midpoint of the bus is more stable, and the stability of the whole power supply is improved.
In some embodiments, S103 may include:
s1031: performing pulse width modulation on the duty ratio regulating quantity as a first target duty ratio to generate a first driving signal; the first driving signal is used for indicating an upper bridge arm switching tube of the balance bridge to act according to a first target duty ratio;
s104 may include:
s1041: performing pulse width modulation by taking the absolute value of the duty ratio regulating quantity as a second target duty ratio to generate a second driving signal; the second driving signal is used for indicating a lower bridge arm switching tube of the balance bridge to act according to a second target duty ratio.
Furthermore, in order to improve the control precision, the duty ratio adjustment quantity can be multiplied by a carrier cycle (which can be a power frequency cycle or a high frequency cycle)) to obtain a first on-time, and the upper bridge arm switching tube is controlled to be switched on and off for multiple times in one cycle according to the first on-time, so that the total on-time of the upper bridge arm switching tube in one carrier cycle is equal to the first on-time. The lower bridge arm switching tube is controlled by the same method. Referring to fig. 5, in the embodiment of the present invention, the switching tube is controlled to be turned on for multiple times in one carrier period, so that the energy of the positive bus and the energy of the negative bus are exchanged more stably, and the current ripple of the balance bridge inductor is further reduced, so that the midpoint potential of the bus is adjusted more stably. The switching times of the switching tube in one carrier period can be set according to the actual application requirements.
In some embodiments, the first controller and the second controller may each be proportional-integral controllers.
In some embodiments, before S101, the method may further include:
s105: acquiring the voltage to ground of a positive bus and the voltage to ground of a negative bus corresponding to the balance bridge;
s106: and subtracting the absolute value of the voltage to earth of the negative bus from the voltage to earth of the positive bus to obtain the voltage difference between the positive bus and the negative bus.
It should be understood that, the sequence numbers of the steps in the foregoing embodiments do not imply an execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present invention.
Corresponding to the above embodiment, referring to fig. 6, an embodiment of the present invention further provides a balance bridge voltage-sharing control device, including:
the pressure difference acquisition module 21 is used for acquiring the pressure difference between the positive bus and the negative bus corresponding to the balance bridge;
the regulating quantity determining module 22 is used for determining the duty ratio regulating quantity according to the pressure difference between the positive bus and the negative bus;
the first control module 23 is configured to control an upper bridge arm switching tube of the balance bridge to operate according to the duty ratio adjustment amount if the duty ratio adjustment amount is greater than a preset threshold;
the second control module 24 is configured to control the action of a lower bridge arm switching tube of the balance bridge according to the duty ratio adjustment amount if the duty ratio adjustment amount is not greater than the preset threshold; the upper bridge arm switching tube and the lower bridge arm switching tube are in non-complementary conduction.
In some embodiments, the adjustment amount determination module 22 may include:
an inductance current obtaining unit 221, configured to obtain an inductance current value of a balance bridge inductance flowing through a balance bridge;
and an adjustment quantity determining unit 222, configured to determine a duty ratio adjustment quantity according to the inductance current value and a voltage difference between the positive bus and the negative bus.
In some embodiments, the adjustment amount determining unit 222 is specifically configured to:
1. inputting the pressure difference between the positive bus and the negative bus into a first controller to obtain a reference current value;
2. and subtracting the inductance current value from the reference current value to obtain a current error value, and inputting the current error value into the second controller to obtain the duty ratio regulating quantity.
In some embodiments, the predetermined threshold is 0.
In some embodiments, the first control module 23 is specifically configured to:
performing pulse width modulation on the duty ratio regulating quantity as a first target duty ratio to generate a first driving signal; the first driving signal is used for indicating an upper bridge arm switching tube of the balance bridge to act according to a first target duty ratio;
the second control module 24 is specifically configured to:
performing pulse width modulation by taking the absolute value of the duty ratio regulating quantity as a second target duty ratio to generate a second driving signal; the second driving signal is used for indicating a lower bridge arm switching tube of the balance bridge to act according to a second target duty ratio.
In some embodiments, the first controller and the second controller are both proportional integral controllers.
In some embodiments, the apparatus may further include:
a positive and negative bus voltage obtaining module 25, configured to obtain a voltage to ground of a positive bus and a voltage to ground of a negative bus corresponding to the balance bridge;
and a voltage difference determining module 26, configured to subtract the absolute value of the voltage to ground of the negative bus from the voltage to ground of the positive bus to obtain a voltage difference between the positive bus and the negative bus.
It is obvious to those skilled in the art that, for convenience and simplicity of description, the foregoing functional units and modules are merely illustrated in terms of division, and in practical applications, the foregoing functional allocation may be performed by different functional units and modules as needed, that is, the internal structure of the power control device is divided into different functional units or modules to perform all or part of the above described functions. Each functional unit and module in the embodiments may be integrated in one processing unit, or each unit may exist alone physically, or two or more units are integrated in one unit, and the integrated unit may be implemented in a form of hardware, or in a form of software functional unit. In addition, specific names of the functional units and modules are only for convenience of distinguishing from each other, and are not used for limiting the protection scope of the present application. The specific working processes of the units and modules in the above-mentioned apparatus may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
Fig. 7 is a schematic block diagram of a power control apparatus according to an embodiment of the present invention. As shown in fig. 7, the power supply control device 4 of this embodiment includes: one or more processors 40, a memory 41, and a computer program 42 stored in the memory 41 and executable on the processors 40. The processor 40, when executing the computer program 42, implements the steps in the above-described embodiments of the equalizer bridge voltage equalizing control method, such as the steps S101 to S104 shown in fig. 3. Alternatively, the processor 40, when executing the computer program 42, implements the functions of the modules/units in the above-described embodiment of the equalizer bridge voltage equalizing control device, such as the functions of the modules 21 to 24 shown in fig. 6.
Illustratively, the computer program 42 may be divided into one or more modules/units, which are stored in the memory 41 and executed by the processor 40 to accomplish the present application. One or more of the modules/units may be a series of computer program instruction segments capable of performing specific functions, which are used to describe the execution of the computer program 42 in the power control device 4. For example, the computer program 42 may be partitioned into the differential pressure acquisition module 21, the adjustment amount determination module 22, the first control module 23, and the second control module 24.
The pressure difference acquisition module 21 is used for acquiring the pressure difference between the positive bus and the negative bus corresponding to the balance bridge;
the regulating quantity determining module 22 is used for determining the duty ratio regulating quantity according to the pressure difference between the positive bus and the negative bus;
the first control module 23 is configured to control an upper bridge arm switching tube of the balance bridge to operate according to the duty ratio adjustment amount if the duty ratio adjustment amount is greater than a preset threshold;
the second control module 24 is configured to control the action of a lower bridge arm switching tube of the balance bridge according to the duty ratio adjustment amount if the duty ratio adjustment amount is not greater than the preset threshold; the upper bridge arm switching tube and the lower bridge arm switching tube are in non-complementary conduction.
Other modules or units are not described in detail herein.
The power control device 4 includes, but is not limited to, a processor 40, a memory 41. It will be appreciated by those skilled in the art that fig. 7 is merely an example of a power control device and does not constitute a limitation of the power control device 4 and may include more or fewer components than shown, or some components may be combined, or different components, e.g. the power control device 4 may also include an input device, an output device, a network access device, a bus, etc.
The Processor 40 may be a Central Processing Unit (CPU), other general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) or other Programmable logic device, discrete Gate or transistor logic device, discrete hardware component, etc. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
The memory 41 may be an internal storage unit of the power control apparatus, such as a hard disk or a memory of the power control apparatus. The memory 41 may also be an external storage device of the power control apparatus, such as a plug-in hard disk provided on the power control apparatus, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card), and the like. Further, the memory 41 may also include both an internal storage unit of the power control device and an external storage device. The memory 41 is used for storing a computer program 42 and other programs and data required by the power control device. The memory 41 may also be used to temporarily store data that has been output or is to be output.
In the above embodiments, the descriptions of the respective embodiments have respective emphasis, and reference may be made to the related descriptions of other embodiments for parts that are not described or illustrated in a certain embodiment.
Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.
In the embodiments provided in the present application, it should be understood that the disclosed power control apparatus and method may be implemented in other ways. For example, the above-described power control device embodiments are merely illustrative, and for example, a division of modules or units is only one logical function division, and an actual implementation may have another division, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
Units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated modules/units, if implemented in the form of software functional units and sold or used as separate products, may be stored in a computer readable storage medium. Based on such understanding, all or part of the flow in the method according to the embodiments described above may be implemented by a computer program, which is stored in a computer readable storage medium and used by a processor to implement the steps of the embodiments of the methods described above. Wherein the computer program comprises computer program code, which may be in the form of source code, object code, an executable file or some intermediate form, etc. The computer readable medium may include: any entity or device capable of carrying computer program code, recording medium, usb disk, removable hard disk, magnetic disk, optical disk, computer Memory, Read-Only Memory (ROM), Random Access Memory (RAM), electrical carrier wave signals, telecommunications signals, software distribution medium, and the like. It should be noted that the computer readable medium may include any suitable increase or decrease as required by legislation and patent practice in the jurisdiction, for example, in some jurisdictions, computer readable media may not include electrical carrier signals and telecommunications signals in accordance with legislation and patent practice.
Corresponding to the above embodiment, referring to fig. 8, an embodiment of the present invention further provides a power supply, including: positive BUS BUS +, negative BUS BUS-, positive BUS capacitor C1, negative BUS capacitor C2, balance bridge 1, balance bridge inductor L1 and power control device 4 provided in the above embodiment;
the first end of the positive BUS capacitor C1 is connected with the positive BUS BUS +, and the second end of the positive BUS capacitor C1 is connected with the first end of the negative BUS capacitor C2; the second end of the negative BUS capacitor C2 is connected with the negative BUS BUS-;
the balance bridge 1 is provided with a first end connected with a positive BUS BUS +, a second end connected with a negative BUS BUS-, and a midpoint connected with the connection point of a positive BUS capacitor C1 and a negative BUS capacitor C2 through a balance bridge inductor L1;
the power control device 4 is connected to the balance bridge 1.
The above embodiments are only used to illustrate the technical solutions of the present application, and not to limit the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present application and are intended to be included within the scope of the present application.
Claims (10)
1. A balance bridge voltage-sharing control method is characterized by comprising the following steps:
acquiring the pressure difference between a positive bus and a negative bus corresponding to the balance bridge;
determining a duty ratio regulating quantity according to the pressure difference between the positive bus and the negative bus;
if the duty ratio regulating quantity is larger than a preset threshold value, controlling the action of an upper bridge arm switching tube of the balance bridge according to the duty ratio regulating quantity;
if the duty ratio regulating quantity is not larger than the preset threshold value, controlling the action of a lower bridge arm switching tube of the balance bridge according to the duty ratio regulating quantity
The upper bridge arm switching tube and the lower bridge arm switching tube are in non-complementary conduction.
2. The balance bridge voltage equalizing control method according to claim 1, wherein said determining a duty cycle adjustment based on a pressure differential between said positive and negative buses comprises:
obtaining the inductance current value of the balance bridge inductance corresponding to the balance bridge;
and determining the duty ratio regulating quantity according to the inductance current value and the voltage difference between the positive bus and the negative bus.
3. The balance bridge voltage-sharing control method according to claim 2, wherein the determining the duty ratio adjustment amount according to the inductance current value and the voltage difference between the positive bus and the negative bus comprises:
inputting the pressure difference between the positive bus and the negative bus into a first controller to obtain a reference current value;
and subtracting the inductance current value from the reference current value to obtain a current error value, and inputting the current error value into a second controller to obtain the duty ratio regulating quantity.
4. The balance bridge voltage-sharing control method according to claim 3, wherein the preset threshold is 0.
5. The balance bridge voltage equalizing control method according to claim 3, wherein said first controller and said second controller are proportional-integral controllers.
6. The balance bridge voltage-sharing control method according to any one of claims 1 to 5, wherein the controlling of the action of an upper bridge arm switching tube of the balance bridge according to the duty ratio regulation quantity comprises the following steps:
performing pulse width modulation on the duty ratio regulating quantity as a first target duty ratio to generate a first driving signal; the first driving signal is used for indicating an upper bridge arm switching tube of the balance bridge to act according to the first target duty ratio;
the controlling the action of a lower bridge arm switching tube of the balance bridge according to the duty ratio regulating value comprises the following steps:
performing pulse width modulation by taking the absolute value of the duty ratio regulating quantity as a second target duty ratio to generate a second driving signal; the second driving signal is used for indicating a lower bridge arm switching tube of the balance bridge to act according to the second target duty ratio.
7. The balance bridge voltage equalizing control method according to any one of claims 1 to 5, wherein before the obtaining of the pressure difference between the positive and negative bus bars corresponding to the balance bridge, the method further comprises:
acquiring the voltage to ground of a positive bus and the voltage to ground of a negative bus corresponding to the balance bridge;
and subtracting the absolute value of the voltage to earth of the negative bus from the voltage to earth of the positive bus to obtain the voltage difference between the positive bus and the negative bus.
8. A power control apparatus comprising a memory, a processor and a computer program stored in said memory and executable on said processor, wherein said processor implements the steps of the balanced bridge voltage sharing control method according to any one of claims 1 to 7 when executing said computer program.
9. A computer-readable storage medium, in which a computer program is stored, which, when being executed by a processor, carries out the steps of the equalizer bridge voltage equalizing control method according to any one of claims 1 to 7.
10. A power supply, comprising: a positive bus, a negative bus, a positive bus capacitance, a negative bus capacitance, a balance bridge inductance, and the power control apparatus of claim 8;
the first end of the positive bus capacitor is connected with the positive bus, and the second end of the positive bus capacitor is connected with the first end of the negative bus capacitor; the second end of the negative bus capacitor is connected with the negative bus;
the first end of the balance bridge is connected with the positive bus, the second end of the balance bridge is connected with the negative bus, and the midpoint of the balance bridge is connected with the connection point of the positive bus capacitor and the negative bus capacitor through the balance bridge inductor;
the power control device is connected with the balance bridge.
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