CN114499180A - Multiphase converter, and thermal balance control method and device of multiphase converter - Google Patents
Multiphase converter, and thermal balance control method and device of multiphase converter Download PDFInfo
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- CN114499180A CN114499180A CN202210342579.4A CN202210342579A CN114499180A CN 114499180 A CN114499180 A CN 114499180A CN 202210342579 A CN202210342579 A CN 202210342579A CN 114499180 A CN114499180 A CN 114499180A
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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
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
- G05F1/10—Regulating voltage or current
- G05F1/46—Regulating voltage or current wherein the variable actually regulated by the final control device is DC
- G05F1/56—Regulating voltage or current wherein the variable actually regulated by the final control device is DC using semiconductor devices in series with the load as final control devices
- G05F1/565—Regulating voltage or current wherein the variable actually regulated by the final control device is DC using semiconductor devices in series with the load as final control devices sensing a condition of the system or its load in addition to means responsive to deviations in the output of the system, e.g. current, voltage, power factor
- G05F1/567—Regulating voltage or current wherein the variable actually regulated by the final control device is DC using semiconductor devices in series with the load as final control devices sensing a condition of the system or its load in addition to means responsive to deviations in the output of the system, e.g. current, voltage, power factor for temperature compensation
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Abstract
The invention discloses a multiphase converter, a heat balance control method and a heat balance control device of the multiphase converter, wherein the heat balance control method of the multiphase converter comprises the following steps: acquiring the actual temperature of a power converter in the multiphase converter; obtaining a temperature compensation coefficient of each phase circuit according to the actual temperature of the power converter; respectively adjusting a preset current reference value by using a temperature compensation coefficient of each phase circuit to obtain a current expected value of each phase circuit; and carrying out balance control on the circuit of each phase according to the current expected value of the circuit of each phase. Therefore, a temperature compensation coefficient can be introduced based on the actual temperature of the power converter in the multiphase converter, and the heat balance control among the multiple phases is further realized.
Description
Technical Field
The invention relates to the technical field of current control, in particular to a multiphase converter, and a heat balance control method and device of the multiphase converter.
Background
In the design of a medium-high power DC-DC power converter, because a circuit path needs to flow a large current, if a single-phase structure is adopted, the model selection size, the heat dissipation, the dynamic circuit response and the like of components such as an inductor, a capacitor and the like are difficult points in design. In order to reduce the capacitance and inductance volume, reduce input and output current ripples, and optimize heating power distribution, the interleaved and parallel multiphase DC-DC power converters are widely used, such as on-board-charger (OBC) of electric vehicles, battery-based and capacitor-based power supplies, and the like.
In the control of the traditional multiphase DC-DC converter, because of different load characteristics, different attenuation of each phase circuit component, different controller parameters and other factors, the phenomenon of unbalance of two-phase or multiphase circuits through current can be caused, and the system performance is influenced. Therefore, how to achieve current sharing among multi-phase circuits has been a design hotspot and difficulty.
The traditional current sharing methods mainly include current sharing by a voltage regulation method, current sharing by an average current method and the like. The former uses the voltage loop output as the input reference current value of each phase current controller to achieve current balance between different phases. Even if the output current reference value changes when the voltage loop changes, the current reference value of each phase is still the same (because each phase current reference value is from the same voltage loop output), so that the real-time current spontaneous balance can be maintained. The average current sharing method is that the current of each phase is collected, added and then divided by the total number of the phases, and the obtained result is used as a current reference value and fed back to a current controller.
It can be seen that the traditional current sharing method needs to collect the output current of each phase to realize the accurate control of the current, and finally, the purpose of balanced heat dissipation of each phase is achieved. This puts higher demands on the current sensor accuracy and sampling circuit design.
Parameters of circuit components are inevitably changed along with time and attenuation, such as Direct Current Resistance (DCR) of an inductor and resistance (R) of a power switchds_on) The path resistance of a Printed Circuit Board (PCB), etc. In addition, when the circuit is maintained, for example, a certain path of inductance component is replaced, it is difficult to ensure that the new replacement original and the original are completely matched.
When these resistance parameters are changed, even if the current flowing through each phase is the same, the heating value will be different, which will bring great challenges to the heat dissipation of the system. Especially for magnetic components such as inductors, the working performance of the magnetic components can be seriously influenced by heat generation.
Therefore, how to design a control method capable of realizing heat balance of the multiphase DC-DC converter is an urgent problem to be solved.
Disclosure of Invention
Embodiments of the present invention provide a multiphase converter, and a method and an apparatus for controlling thermal balance of the multiphase converter, so as to control thermal balance of the multiphase converter.
According to a first aspect, an embodiment of the present invention provides a method for controlling thermal balance of a multiphase converter, including the following steps: acquiring the actual temperature of a power converter in the multiphase converter; obtaining a temperature compensation coefficient of each phase circuit according to the actual temperature of the power converter; respectively adjusting a preset current reference value by using a temperature compensation coefficient of each phase circuit to obtain a current expected value of each phase circuit; and carrying out balance control on the circuit of each phase according to the current expected value of the circuit of each phase.
According to the heat balance control method of the multiphase converter, provided by the embodiment of the invention, the temperature compensation coefficient is introduced based on the actual temperature of the power converter in the multiphase converter, so that the heat balance control among multiple phases is realized. That is, to solve the thermal balance problem of the multiphase DC-DC converter, in the embodiment of the present invention, a thermal balance control algorithm is added to the original current feedback control algorithm, and the output of the thermal balance compensator is used to correct the current control reference value, so as to finally achieve the heat dissipation balance among the multiple phases.
With reference to the first aspect, in a first implementation manner of the first aspect, the obtaining a temperature compensation coefficient of each phase circuit according to an actual temperature of the power converter includes: obtaining a temperature reference value according to the actual temperature of the power converter; for any phase circuit, obtaining a temperature compensation coefficient of the phase circuit according to the actual temperature of the power converter corresponding to the phase circuit and the temperature reference value; and traversing each phase circuit in the multiphase converter to obtain the temperature compensation coefficient of each phase circuit.
With reference to the first implementation manner of the first aspect, in a second implementation manner of the first aspect, the obtaining a temperature compensation coefficient of the phase circuit according to the actual temperature of the power converter corresponding to the phase circuit and the temperature reference value includes: and obtaining the temperature compensation coefficient of the phase circuit according to the temperature compensation enabling signal, the temperature reference value and the actual temperature of the power converter corresponding to the phase circuit.
With reference to the second embodiment of the first aspect, in a third embodiment of the first aspect, the method for controlling the thermal balance of the multiphase converter further includes: when a thermal balance instruction is received, setting the temperature compensation enable signal to be 1; when a current balance instruction is received, the temperature compensation enable signal is set to 0.
With reference to the first aspect, in a fourth implementation manner of the first aspect, the adjusting the preset current reference value by using the temperature compensation coefficient of each phase circuit respectively to obtain the current expected value of each phase circuit includes: for any phase circuit, multiplying the current reference value by the temperature compensation coefficient of the phase circuit to obtain the current expected value of the phase circuit; and traversing each phase circuit in the multiphase converter to obtain the current expected value of each phase circuit.
With reference to the first aspect, in a fifth implementation manner of the first aspect, the method for controlling the thermal balance of the multiphase converter further includes: respectively acquiring output voltage and reference voltage of the multiphase converter; and obtaining the current reference value according to the output voltage and the reference voltage.
With reference to the first aspect, in a sixth implementation manner of the first aspect, the performing balance control on the circuit of each phase according to the current expected value of the circuit of each phase includes: respectively acquiring the actual current of each phase circuit; aiming at any phase current, obtaining a control signal of the phase circuit according to the actual current and the current expected value of the phase current; and traversing each phase circuit in the multiphase converter to obtain a control signal of each phase circuit.
With reference to the first aspect, in a seventh implementation manner of the first aspect, the update frequency of the temperature compensation coefficient is less than the update frequency of the current reference value.
According to a second aspect, the embodiment of the present invention further provides a thermal balance control apparatus for a multiphase converter, including an obtaining module, a temperature compensation coefficient determining module, a current desired value determining module, and a balance control module, where the obtaining module is configured to obtain an actual temperature of a power converter in the multiphase converter; the temperature compensation coefficient determining module is used for obtaining a temperature compensation coefficient of each phase circuit according to the actual temperature of the power converter; the current expected value determining module is used for adjusting a preset current reference value by using the temperature compensation coefficient of each phase circuit respectively to obtain the current expected value of each phase circuit; the balance control module is used for carrying out balance control on each phase circuit according to the current expected value of each phase circuit.
According to a third aspect, the present invention further provides a multiphase converter, including a circuit module and a controller, where the circuit module and the controller are communicatively connected to each other, and the controller stores therein computer instructions, and executes the computer instructions, so as to execute the method for controlling thermal balance of a multiphase converter according to the first aspect or any embodiment of the first aspect.
Drawings
The features and advantages of the present invention will be more clearly understood by reference to the accompanying drawings, which are illustrative and not to be construed as limiting the invention in any way, and in which:
fig. 1 is a schematic flowchart of a method for controlling the heat balance of a multiphase converter according to embodiment 1 of the present invention;
FIG. 2 is a schematic diagram of the two-phase DC-DC converter circuitry of example 1;
FIG. 3 is a block diagram of a two-phase DC-DC converter thermal balance control of example 1;
fig. 4 is a schematic structural diagram of a heat balance control device of a multiphase converter in embodiment 2 of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
s101: an actual temperature of a power converter in a multiphase converter is obtained.
Specifically, the temperature of the heating device of the power converter, for example, the surface temperature of the inductance component, may also be collected, and the temperature of other areas with large heating, for example, the MOSFET switch, the switching node (switching node), etc., may also be collected.
S102: and obtaining the temperature compensation coefficient of each phase circuit according to the actual temperature of the power converter.
Specifically, the following technical scheme may be adopted to obtain the temperature compensation coefficient of each phase circuit according to the actual temperature of the power converter: obtaining a temperature reference value according to the actual temperature of the power converter; for any phase circuit, obtaining a temperature compensation coefficient of the phase circuit according to the actual temperature of the power converter corresponding to the phase circuit and the temperature reference value; and traversing each phase circuit in the multiphase converter to obtain the temperature compensation coefficient of each phase circuit.
More specifically, the following scheme may be adopted to obtain the temperature reference value according to the actual temperature of the power converter: and calculating the average value of the actual temperatures of all the power converters, and taking the average value as the temperature reference value.
More specifically, the following scheme may be adopted to obtain the temperature compensation coefficient of the phase circuit according to the actual temperature of the power converter corresponding to the phase circuit and the temperature reference value: and controlling the actual temperature of the power converter corresponding to the phase circuit and the temperature reference value by adopting a preset first control method to obtain the temperature compensation coefficient of the phase circuit. Specifically, the first control method includes, but is not limited to: PI control, predictive control, and feed-forward control.
For example, the actual temperature of the power converter corresponding to the phase circuit and the temperature reference value may be input into a temperature compensator for control, wherein the control method adopted in the temperature compensator includes, but is not limited to: PI control, predictive control, and feed-forward control.
The temperature compensator is used for adjusting the current reference value of each path, and when the control method adopted in the temperature compensator is PI control, the calculation formula in the temperature compensator is formula (1). That is, for any phase circuit i, its temperature compensation coefficientα iCan be obtained by the following formula (1):
In the above-mentioned formula (1),
which is indicative of a reference value for the temperature,
representing the actual temperature of the power converter in circuit i,
a function value representing a temperature-compensated transfer function,
representing the temperature compensation enable signal.
Further, the following scheme may be adopted to obtain the temperature compensation coefficient of the phase circuit according to the actual temperature of the power converter corresponding to the phase circuit and the temperature reference value: and obtaining the temperature compensation coefficient of the phase circuit according to the temperature compensation enabling signal, the temperature reference value and the actual temperature of the power converter corresponding to the phase circuit.
Specifically, when a thermal balance instruction is received, the temperature compensation enable signal is set to 1; when a current balance instruction is received, the temperature compensation enable signal is set to 0. Thereby, switching between the current balance mode and the thermal balance mode can be realized.
S103: and respectively adjusting the preset current reference value by using the temperature compensation coefficient of each phase circuit to obtain the current expected value of each phase circuit.
As a specific implementation manner, the following scheme may be adopted to obtain the current expected value of each phase circuit by respectively adjusting the preset current reference value by using the temperature compensation coefficient of each phase circuit: for any phase circuit, multiplying the current reference value by the temperature compensation coefficient of the phase circuit to obtain the current expected value of the phase circuit; and traversing each phase circuit in the multiphase converter to obtain the current expected value of each phase circuit.
Illustratively, for any phase circuit i, its current desired value
Can be obtained by the following formula (2):
In the above-mentioned formula (2),
representing the desired value of the current for the i-phase circuit,
representing the current reference value.
As can be seen from the above equations (1) and (2), the expected current value of each phase circuit is inversely related to the actual temperature of each circuit (e.g., the expected current value of each circuit is proportional to the actual temperature of each circuitI Li_ref AndT iin an inverse relationship). In other words, for example, when the first phase circuit temperatureT 1Above the temperature reference valueT refThen, according to the control logic, the temperature compensation coefficientα 1Drop, current desired valueI L1_refDescend and thus generate heatThe amount will decrease and the temperature will decrease, eventually serving the purpose of thermal equilibrium control.
Assuming that the multiphase converter includes two-phase circuits, when the temperatures of the two circuits are balanced (T 1 =T 2 =T ref) Then, compensating the parameter by temperatureα 1Andα 2have values of all 1: (α 1=α 2 = 1）。
Also, if the enable En control signal is off (En = 0), thenα 1Andα 2the value of (1) is set as an initial value, namely, the two paths of flowing currents are equal by default (at the moment, the heat balance control function does not work, and the two paths of flowing currents are equivalent to being switched out of a control module). The selection of the enable signal is dependent on the particular system performance requirements, e.g., whether current balancing or thermal balancing is desired as the ultimate goal. Through the control of the enable end signal, the system controller can be switched between a current balance mode and a heat balance mode. That is, the method for controlling the heat balance of the multiphase converter according to embodiment 1 of the present invention further includes: when a thermal balance instruction is received, setting the temperature compensation enable signal to be 1; when a current balance instruction is received, the temperature compensation enable signal is set to 0.
Specifically, the current reference value can be obtained by the following method: respectively acquiring output voltage and reference voltage of the multiphase converter; and obtaining the current reference value according to the output voltage and the reference voltage.
More specifically, the following scheme may be adopted to obtain the current reference value according to the output voltage and the reference voltage: and controlling the output voltage and the reference voltage in a preset second control mode to obtain the current reference value. Specifically, the second control method includes, but is not limited to: PI control, predictive control, and feed-forward control.
For example, the output voltage and the reference voltage may be input to a voltage controller for control, wherein the control method adopted in the voltage controller includes but is not limited to: PI control, predictive control, and feed-forward control.
As a further embodiment, in order to improve the stability of the thermal balance control method, the update frequency of the temperature compensation coefficient is smaller than the update frequency of the current reference value. This is because the temperature (heat) change is relatively slow with respect to the current change, and when the update frequency of the temperature compensation coefficient is smaller than the update frequency of the current reference value, the thermal balance control method depends on fewer variables at the same time, so that the stability of the thermal balance control method can be increased on the premise of ensuring the accuracy of the thermal balance control method.
S104: and carrying out balance control on the circuit of each phase according to the current expected value of the circuit of each phase.
Wherein the balance control includes at least thermal balance control.
As a specific implementation manner, the following technical solution may be adopted to perform balance control on the circuit of each phase according to the desired value of the current of the circuit of each phase: respectively acquiring the actual current of each phase circuit; aiming at any phase current, obtaining a control signal of the phase circuit according to the actual current and the current expected value of the phase current; and traversing each phase circuit in the multiphase converter to obtain a control signal of each phase circuit.
More specifically, the following scheme can be adopted to obtain the control signal of the phase circuit according to the actual current and the current expected value of the phase current: and controlling the actual current and the expected current value of the phase circuit by adopting a preset third control method, and then combining the phase difference of the PWM signals to obtain a control signal of the phase circuit. Wherein the control signal is a switch control signal and the phase difference of the PWM signal is determined according to the number of phases of the circuit in the system, e.g. the number of phases of the circuit in the system isNThe phase difference of each phase in the PWM signal is 360 DEG/N, so that the voltage ripple of the system output can be reduced.
Specifically, the third control method includes, but is not limited to: PI control, predictive control, or feed forward control.
For example, the actual current and the desired current value of the phase circuit may be input into a current controller for control, wherein the control method adopted in the current controller includes but is not limited to: PI control, predictive control, and feed-forward control.
To explain the heat balance control method of the multiphase converter of embodiment 1 of the present invention in more detail, example 1 is given. Fig. 2 is a schematic diagram of the two-phase DC-DC converter circuit system of example 1, and as shown in fig. 2, the whole system can be divided into two parts: a circuit module and a controller. In the circuit module, the multiphase buck converters are connected in parallel, and the input ends share the same input capacitorC inThe output terminals share the same output capacitorC out. By collecting output voltageV outInductor current (c)I L1，I L2) And circuit temperature (T 1，T 2Here expressed as the temperature at the coupling point of the inductor and the switch) to achieve voltage control, current control, and temperature thermal balance control of the entire circuit. The controller part can also be divided into a voltage controller, a thermal balance compensator, a current controller and a PWM (Pulse-width Modulation) generator part according to corresponding functions. It should be noted that the power converter may adopt different topology structures according to requirements, and the non-isolated buck/boost DC-DC converter used in fig. 2, such as an isolated flyback converter (flyback converter) or a forward converter (forward converter) for conversion, does not affect the function of the system and the algorithm design of the main controller.
The final output of the controller is a switch control signal, and the control signals of the two phases have a phase difference of 180 degrees, so that the purpose of reducing the output voltage ripple is achieved. If the number of phases in the circuit isNThe phase difference of each phase is controlled to be 360/N.
Fig. 3 is a block diagram of a two-phase DC-DC converter thermal balance control of example 1. As shown in fig. 2 and fig. 3, first, the system output voltage Vout is collected and input to the voltage controller together with the reference voltage value Vref, and the output is the current reference value, as shown in formula (3):
In the formula (3), the first and second groups,G volrepresenting the voltage controller transfer function.
The thermal balance compensator comprises a temperature compensator, in which the temperature of the heating device (such as the surface temperature of the inductive component) of the two-way converter is collectedT 1AndT 2) Calculating the average temperature of the two as the temperature reference valueT ref. Then the actual temperature of each path is calculated (T 1AndT 2) And a temperature reference value of (T ref) As input of the temperature compensator, the output is temperature compensation parameterα 1Andα 2. The function of the temperature compensation parameter is to adjust the current expected value of each pathI L1_refAndI L2_ref。
finally, the reference value of the current (I L1_refAndI L2_ref) And actual current measurements (I L1AndI L2) Input into a current controller and generate a control signal via a PWM generatorD 1AndD 2to control the MOSFET switch (S)u1,Sl1) And (S)u2,Sl2) The on and off of the two-phase circuit are realized, and the balance control of the two-phase circuit is realized. The control signal calculation formula is shown as (4):
In the formula (4), the first and second groups,G curin order to be a transfer function of the current controller,G PWMis the PWM generator transfer function.
It should be noted that fig. 1 and 2 take a two-phase DC-DC converter as an example, and if the system needs to implement multi-path control, only the number of parallel phases needs to be changed from 2 to 2NThe phase difference of the control signals between the phases is set to 360 DEG/N, and the remaining control logic is not changed.
With the heat balance control method of the multiphase converter of embodiment 1 of the present invention, the following control targets can be achieved:
the output current carrying capacity is improved by connecting the multiphase DC-DC converters in parallel. And the system output voltage ripple is reduced through the phase difference of the switch control signals. The output voltage is regulated by the voltage controller to realize the constant voltage charging control of the battery. The phase current reference values are adjusted by a thermal balance compensator to achieve thermal balance between the phases. The output current is regulated through the current controller so as to realize the constant-current charging control of the battery. According to the function of the controller, the bandwidths of the voltage control loop, the current control loop and the temperature control loop are adjusted, and the system stability during the coupling of the control loops is improved. For example, the current control loop bandwidth needs to be larger than the temperature control loop bandwidth. By adding the enabling signal, the smooth transition of the 'switching-in' and 'switching-out' systems of the thermal balance compensator is realized, and the switching between the current balance mode and the thermal balance mode can be realized. In other words, when the thermal balance enable is turned on, the system enters a thermal balance mode; when the enable is off, the system is in the traditional current balancing mode (when the thermal balancing controller is not active).
Example 2
Specifically, the obtaining module 20 is configured to obtain an actual temperature of a power converter in the multiphase converter;
the temperature compensation coefficient determining module 21 is configured to obtain a temperature compensation coefficient of each phase circuit according to the actual temperature of the power converter;
the current expected value determining module 22 is configured to adjust a preset current reference value by using the temperature compensation coefficient of each phase circuit, respectively, to obtain a current expected value of each phase circuit;
and the balance control module 23 is configured to perform balance control on the circuit of each phase according to the current expected value of the circuit of each phase.
The specific details of the heat balance control device of the multiphase converter can be understood by referring to the corresponding related descriptions and effects in the embodiments shown in fig. 1 to fig. 3, and are not described herein again.
Example 3
Embodiment 3 of the present invention further provides a multiphase converter, wherein the multiphase converter includes a current module and a controller, the circuit module and the controller are communicatively connected to each other, and the controller includes a processor and a memory, wherein the processor and the memory may be connected by a bus or other means. Embodiment 3 of the invention a specific implementation of a multiphase converter can be seen in fig. 2.
Specifically, the controller includes a voltage controller, a thermal balance compensator, a current controller, and a PWM generator. Wherein, the thermal balance compensator comprises a temperature compensator.
The processor may be a Central Processing Unit (CPU). The Processor may also be other general purpose processors, Digital Signal Processors (DSPs), Application Specific Integrated Circuits (ASICs), Field Programmable Gate Arrays (FPGAs) or other Programmable logic devices, discrete Gate or transistor logic devices, discrete hardware components, or a combination thereof.
The memory, which is a non-transitory computer readable storage medium, may be used to store non-transitory software programs, non-transitory computer executable programs, and modules, such as program instructions/modules corresponding to the thermal balance control method of the multiphase converter in the embodiment of the present invention (for example, the obtaining module 20, the temperature compensation coefficient determining module 21, the desired current value determining module 22, and the balance control module 23 shown in fig. 4). The processor executes various functional applications and data processing of the processor by executing non-transitory software programs, instructions and modules stored in the memory, namely, the method for controlling the thermal balance of the multiphase converter in the above method embodiment is realized.
The memory may include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required for at least one function; the storage data area may store data created by the processor, and the like. Further, the memory may include high speed random access memory, and may also include non-transitory memory, such as at least one disk storage device, flash memory device, or other non-transitory solid state storage device. In some embodiments, the memory optionally includes memory located remotely from the processor, and such remote memory may be coupled to the processor via a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.
The one or more modules are stored in the memory and, when executed by the processor, perform a method of thermal balancing control for a multiphase converter as in the embodiment of fig. 1-3.
The details of the electronic device may be understood by referring to the corresponding descriptions and effects in the embodiments shown in fig. 1 to fig. 4, and are not described herein again.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by a computer program, which can be stored in a computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. The storage medium may be a magnetic Disk, an optical Disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a Flash Memory (Flash Memory), a Hard Disk (Hard Disk Drive, abbreviated as HDD) or a Solid State Drive (SSD), etc.; the storage medium may also comprise a combination of memories of the kind described above.
Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the invention, and such modifications and variations fall within the scope defined by the appended claims.
Claims (8)
1. A method of controlling thermal balance in a multiphase converter, comprising:
acquiring the actual temperature of a power converter in the multiphase converter;
obtaining a temperature compensation coefficient of each phase circuit according to the actual temperature of the power converter;
respectively adjusting a preset current reference value by using a temperature compensation coefficient of each phase circuit to obtain a current expected value of each phase circuit;
carrying out balance control on each phase circuit according to the current expected value of each phase circuit;
the obtaining of the temperature compensation coefficient of each phase circuit according to the actual temperature of the power converter comprises:
obtaining a temperature reference value according to the actual temperature of the power converter;
for any phase circuit, obtaining a temperature compensation coefficient of the phase circuit according to the actual temperature of the power converter corresponding to the phase circuit and the temperature reference value;
traversing each phase circuit in the multiphase converter to obtain a temperature compensation coefficient of each phase circuit;
the obtaining of the temperature compensation coefficient of the phase circuit according to the actual temperature of the power converter corresponding to the phase circuit and the temperature reference value comprises:
and obtaining the temperature compensation coefficient of the phase circuit according to the temperature compensation enabling signal, the temperature reference value and the actual temperature of the power converter corresponding to the phase circuit.
2. The method of claim 1, further comprising:
when a thermal balance instruction is received, setting the temperature compensation enable signal to be 1;
when a current balance instruction is received, the temperature compensation enable signal is set to 0.
3. The method of claim 1, wherein the adjusting the preset current reference value by using the temperature compensation coefficient of each phase circuit respectively to obtain the desired current value of each phase circuit comprises:
for any phase circuit, multiplying the current reference value by the temperature compensation coefficient of the phase circuit to obtain the current expected value of the phase circuit;
and traversing each phase circuit in the multiphase converter to obtain the current expected value of each phase circuit.
4. The method of claim 1, further comprising:
respectively acquiring output voltage and reference voltage of the multiphase converter;
and obtaining the current reference value according to the output voltage and the reference voltage.
5. The method of claim 1, wherein the performing balance control on the circuit of each phase according to the desired value of the current of the circuit of each phase comprises:
respectively acquiring the actual current of each phase circuit;
aiming at any phase current, obtaining a control signal of the phase circuit according to the actual current and the current expected value of the phase current; and traversing each phase circuit in the multiphase converter to obtain a control signal of each phase circuit.
6. The method of claim 1, wherein the frequency of updating the temperature compensation coefficient is less than the frequency of updating the current reference value.
7. A thermal balance control apparatus for a multiphase converter, comprising:
the acquisition module is used for acquiring the actual temperature of the power converter in the multiphase converter;
the temperature compensation coefficient determining module is used for obtaining the temperature compensation coefficient of each phase circuit according to the actual temperature of the power converter;
the current expected value determining module is used for adjusting a preset current reference value by respectively utilizing the temperature compensation coefficient of each phase circuit to obtain the current expected value of each phase circuit;
the balance control module is used for carrying out balance control on each phase circuit according to the current expected value of each phase circuit;
the temperature compensation coefficient determination module is specifically configured to: obtaining a temperature reference value according to the actual temperature of the power converter; for any phase circuit, obtaining a temperature compensation coefficient of the phase circuit according to the actual temperature of the power converter corresponding to the phase circuit and the temperature reference value; traversing each phase circuit in the multiphase converter to obtain a temperature compensation coefficient of each phase circuit; wherein obtaining the temperature compensation coefficient of the phase circuit according to the actual temperature of the power converter corresponding to the phase circuit and the temperature reference value comprises: and obtaining the temperature compensation coefficient of the phase circuit according to the temperature compensation enabling signal, the temperature reference value and the actual temperature of the power converter corresponding to the phase circuit.
8. A multiphase converter, comprising:
a circuit module and a controller, the circuit module and the controller being communicatively connected to each other, the controller having stored therein computer instructions, the controller executing the computer instructions to perform the method of controlling the thermal balance of a multiphase converter according to any one of claims 1-6.
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