CN113746339B - DCDC converter control method, device and system - Google Patents
DCDC converter control method, device and system Download PDFInfo
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- CN113746339B CN113746339B CN202111119902.3A CN202111119902A CN113746339B CN 113746339 B CN113746339 B CN 113746339B CN 202111119902 A CN202111119902 A CN 202111119902A CN 113746339 B CN113746339 B CN 113746339B
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- 238000000034 method Methods 0.000 title claims abstract description 40
- 238000005070 sampling Methods 0.000 claims abstract description 93
- 238000004364 calculation method Methods 0.000 claims description 35
- 238000006243 chemical reaction Methods 0.000 claims description 29
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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
- H02M3/1584—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 with a plurality of power processing stages connected in parallel
-
- 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
-
- 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
- H02M1/32—Means for protecting converters other than automatic disconnection
Abstract
The invention discloses a DCDC converter control method, device and system. The DCDC converter control method comprises the following steps: determining a target peak current through the target average current and the first sampling current based on a feedback control algorithm; and receiving the target peak current, and generating a DCDC converter control signal according to the target peak current and the second sampling current. The target average current is taken as an input, the first sampling current is taken as feedback, the target peak current is taken as an output to form an outer current control loop, and the target peak current, the second sampling current is taken as an input and the DCDC converter control signal is taken as an output to form an inner current control loop. The DCDC converter control method provided by the invention is provided with the outer current control loop and the inner current control loop, and can improve the control precision of the DCDC converter, control response speed and control robustness based on the DCDC converter control method.
Description
Technical Field
The embodiment of the invention relates to a DCDC converter technology, in particular to a DCDC converter control method, a DCDC converter control device and a DCDC converter control system.
Background
The DCDC converter can be roughly divided into two components, namely a controller and a conversion circuit. Wherein the conversion circuit has a switching element, and the controller is configured to convert the input voltage into a desired output voltage by controlling passage of the switching element.
The working modes of the controller are mainly divided into a voltage control mode and a current control mode. In which the voltage control mode generally comprises a feedback control loop in which a constant frequency sawtooth voltage generated by a clock is compared with a sampling voltage by applying the sampling voltage to a comparator, and a PWM signal is further generated, the duty cycle of which is proportional to the control voltage and determines the percentage of the on-time of the switching element, and thus the output voltage, the voltage control mode has the disadvantage that it is necessary to first detect a load change as an output change and then correct it by a feedback loop, the gain of which varies with the input voltage, and compensation of the gain is difficult to achieve.
The current control mode can make up for some defects of the voltage control mode, and the current control module can be divided into a mean current control mode and a peak current control mode. The average current control mode firstly determines the error of the actual inductance current and the target current, and compares the error with a sawtooth wave to generate a PWM control signal; the peak current control mode compares the actual inductor current with the target current to generate a PWM control signal.
At present, current balance is easy to realize when a plurality of DCDC conversion circuits are connected in parallel based on a current control mode, but the control precision and the stability of the current control mode have a certain improvement space.
Disclosure of Invention
The invention provides a control method, a device and a system of a DCDC converter, which aim to improve the control precision and the robustness of the DCDC converter.
In a first aspect, an embodiment of the present invention provides a DCDC converter control method, including:
determining a target peak current through the target average current and the first sampling current based on a feedback control algorithm;
receiving a target peak current, and generating a DCDC converter control signal according to the target peak current and a second sampling current;
the target average current is taken as an input, the first sampling current is taken as feedback, the target peak current is taken as an output to form an external current control loop, and the target peak current, the second sampling current is taken as an input, and the DCDC converter control signal is taken as an output to form an internal current control loop.
Further, the DC-DC converter comprises a plurality of paths of second sampling currents, wherein one path of second sampling current corresponds to one phase of DC-DC conversion circuit;
taking the average value of the second sampling current and the target peak current as input and taking the DCDC converter control signal of the one-phase DCDC conversion circuit as output to form an internal current control loop;
and determining the average value of the target peak current through the total path number of the target peak current and the second sampling current.
Further, the method further comprises the step of carrying out slope compensation on the average value of the target peak current to form a compensated peak current;
and taking one path of the second sampling current and the compensation peak current as inputs, and taking a DCDC converter control signal of a one-phase DCDC conversion circuit as an output to form an internal current control loop.
Further, judging whether one path of the second sampling current is larger than the average value of the target peak current;
and if one path of the second sampling current is larger than the average value of the target peak current, generating a low-level signal, otherwise, generating a high-level signal, wherein the low-level signal and the high-level signal form a PWM signal, and the PWM is a DCDC converter control signal corresponding to a one-phase DCDC conversion circuit.
Further, when the next calculation period is entered, judging whether the target peak current of the current calculation period is the same as the target peak current of the previous calculation period;
if the target peak currents of the two adjacent calculation periods are different, the DCDC converter control signal of the current calculation period is determined again, otherwise, the DCDC converter control signal of the previous calculation period is used.
Further, the method includes determining a slope compensation value, and forming a compensation peak current by making a difference between the average value of the target peak current and the slope compensation value.
Further, the feedback control algorithm adopts a PID controller algorithm.
In a second aspect, an embodiment of the present invention further provides a DCDC converter control device, including:
the feedback control module is used for determining a target peak current through the target average current and the first sampling current;
and the DCDC converter control module is used for generating a DCDC converter control signal according to the target peak current and the second sampling current.
In a third aspect, an embodiment of the present invention further provides a DCDC converter control system, including a controller, where the controller configures an executable program, and the executable program implements the DCDC converter control method described in the embodiment of the present invention when running.
Further, the controller comprises an ADC module, wherein the ADC module is used for collecting a first sampling current, and further comprises a current sensor, and the current sensor is used for collecting a second sampling current.
Compared with the prior art, the invention has the beneficial effects that: the DCDC converter control method provided by the invention is provided with an outer current control loop and an inner current control loop. The method comprises the steps of setting an outer current control loop to enable average current in the DCDC converter to change along with set target average current, enabling the outer current control loop to be equivalent to a first-order system, improving response speed of the system, enabling an output of the outer current control loop to be a target peak current, enabling an inner current control loop to generate a DCDC converter control signal based on the target peak current and a second sampling current, enabling the target peak current to change along with the change of the system, enabling the target peak current to be an optimal reference value of a current calculation period, and enabling accuracy of the generated DCDC converter control signal to be improved relative to that of the DCDC converter control signal generated based on the set peak current and the sampling current, and enabling current limiting of the DCDC converter to be achieved and controlling corresponding speed of the system to be guaranteed due to the fact that a control mode of the inner current control loop is the peak current control mode.
Drawings
FIG. 1 is a flow chart of a DCDC converter control method in an embodiment;
fig. 2 is a schematic diagram of a DCDC converter in an embodiment;
FIG. 3 is a schematic diagram of another DCDC converter in an embodiment;
FIG. 4 is a flow chart of a DCDC converter control method in an embodiment;
FIG. 5 is a flow chart of another DCDC converter control method in an embodiment;
FIG. 6 is a flow chart of another DCDC converter control method in an embodiment;
fig. 7 is a schematic diagram of a DCDC converter control apparatus in the embodiment.
Detailed Description
The invention is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present invention are shown in the drawings.
Example 1
Fig. 1 is a flowchart of a DCDC converter control method in an embodiment, and referring to fig. 1, the DCDC converter control method includes:
s101, determining a target peak current through a target average current and a first sampling current based on a feedback control algorithm.
In this embodiment, the DCDC converter control method is applicable to a DCDC module that needs to adopt a current control mode, and the DCDC converter control method controls a switching tube in the DCDC converter based on current information, thereby controlling the DCDC converter to output a desired signal.
In this embodiment, the structure of the DCDC converter is not particularly limited, and may include a single-phase DCDC conversion structure shown in fig. 1, a double-phase interleaved parallel DCDC conversion structure shown in fig. 2, or other multi-phase interleaved parallel DCDC conversion structures.
In this embodiment, the target average current is an expected current in the load loop where the DCDC converter is located.
In this embodiment, the first sampling current is an average current in a load loop where the DCDC converter is located, for example, an average current I in the DCDC converter structure shown in fig. 2, and an average current I in the DCDC converter structure shown in fig. 3.
In this embodiment, the target peak current is an expected peak value of the current in the load loop where the DCDC converter is located, for example, an expected peak value of the current I in the DCDC converter structure shown in fig. 1.
Illustratively, in this embodiment, the feedback control algorithm may be a PID controller algorithm, a kalman filter algorithm, or the like.
In this embodiment, the input of the feedback control algorithm is a target average current and the first sampling current, and the output of the feedback control algorithm is a target peak current.
S102, receiving the target peak current, and generating a DCDC converter control signal according to the target peak current and the second sampling current.
In this embodiment, the second sampling current is a current sampling value corresponding to a one-phase DCDC conversion circuit in the DCDC conversion structure, for example, a current I sampling value in the DCDC converter structure shown in fig. 1, and a current I1 sampling value and a current I2 sampling value in the DCDC converter structure shown in fig. 3.
Illustratively, in the present embodiment, the DCDC converter control signal is a drive signal for a switching tube in the DCDC converter, or a control signal for a driver for driving the switching tube.
Illustratively, in the present embodiment, generating the DCDC converter control signal from the target peak current and the second sampling current may be implemented based on a comparator, a PWM controller, or the like.
Illustratively, in this embodiment, the target average current to DCDC converter control signal includes two current control loops.
Illustratively, in the present embodiment, an external current control loop is configured with a target average current as an input, a first sampling current as a feedback (input), and a target peak current as an output;
the target peak current and the second sampling current are taken as input and the DCDC converter control signal is taken as output to form an internal current control loop.
The DCDC converter control method proposed in the present embodiment is provided with an outer current control loop and an inner current control loop. The method comprises the steps of setting an outer current control loop to enable average current in the DCDC converter to change along with set target average current, enabling the outer current control loop to be equivalent to a first-order system, improving response speed of the system, enabling an output of the outer current control loop to be a target peak current, enabling an inner current control loop to generate a DCDC converter control signal based on the target peak current and a second sampling current, enabling the target peak current to change along with the change of the system, enabling the target peak current to be an optimal reference value of a current calculation period, and enabling accuracy of the generated DCDC converter control signal to be improved relative to that of the DCDC converter control signal generated based on the set peak current and the sampling current, and enabling current limiting of the DCDC converter to be achieved and controlling corresponding speed of the system to be guaranteed due to the fact that a control mode of the inner current control loop is the peak current control mode.
Fig. 4 is a flowchart of a DCDC converter control method in an embodiment, as an implementation manner, a PID controller algorithm is used as a feedback control algorithm, and a DCDC converter control signal is a driving signal for a switching tube, and based on the DCDC converter structure shown in fig. 2, the DCDC converter control method may specifically include:
s201, in a calculation period, a sampling value of the current I is obtained by the PID controller to serve as a first current sampling value, and the PID controller outputs a target peak current in the calculation period according to the first current sampling value and a set target average current.
Illustratively, in this step, the PID controller is configured with a PID controller algorithm comprising a PID controller equation in discrete form:
where y (K) is the target peak current of the kth period, e (i) is the deviation of the first current sampling value of the ith period from the target average current, K p As the proportion link coefficient, K i Is an integral link coefficient.
In the present embodiment, the PID parameters (K p 、K i ) The automatic setting of the PID can also be performed according to the transfer function of the system.
In this embodiment, an automatic PID setting method in the prior art may be used to set parameters of the PID, and the specific process is not described herein.
S202, calculating the average value of the target peak current according to the target peak current and the phase number of the DCDC converter.
Illustratively, in the scheme, the DCDC converter is of a double-phase staggered parallel DCDC conversion structure, and the target peak current is set as I ref Average value I of target peak current ref_p Is I ref /2。
S203, determining a DCDC converter control signal of the one-phase DCDC conversion circuit according to the average value of the target peak current and one-path second sampling current.
Illustratively, in this solution, the DCDC converter has several phases of DCDC conversion circuits, and then several paths of second sampling currents are corresponding.
For example, the DCDC converter shown in fig. 3 has a two-phase interleaved parallel DCDC conversion structure, and two paths of second sampling currents, namely a second sampling current I1 and a second sampling current I2, are correspondingly present.
Illustratively, in this scheme, the DCDC converter control signal is a PWM signal.
In one calculation period, the DCDC converter control signal PWM1 of the first phase DCDC conversion circuit is generated by:
in one PWM signal period, judging whether the second sampling current I1 is larger than the average value I of the target peak current ref_p ；
If the second sampling current I1 is greater than the average value I of the target peak current ref_p The original PWM signal is triggered to be turned from high level to low level, and when the next PWM signal period starts, the signal formed by the low level signal and the high level signal is the DCDC converter control signal PWM1.
In one calculation period, the DCDC converter control signal PWM2 of the second phase DCDC conversion circuit is generated by:
in one PWM signal period, if the second sampling current I2 is larger than the average value I of the target peak current ref_p The original PWM signal is triggered to turn from high level to low level, and when the next PWM signal period starts, the signal formed by the low level signal and the high level signal is the DCDC converter control signal PWM2.
In this embodiment, the DCDC converter has several phases and several internal current control loops are correspondingly disposed, for example, two internal current control loops are disposed in total for the DCDC converter structure shown in fig. 3.
Exemplary, a path of second sampling current I1 and the average value I of target peak current ref_p As input, the DCDC converter control signal PWM1 constitutes as output a first internal current control loop;
the average value I of the second sampling current I2 and the target peak current ref_p As input, the DCDC converter control signal PWM2 constitutes as output a second internal current control loop.
Control for each phase of the DCDC converter circuit in the DCDC converter is achieved based on the inner current control loop and the inner current control loop.
Fig. 5 is a flowchart of another DCDC converter control method in the embodiment, referring to fig. 5, the DCDC converter control method may be based on the scheme shown in fig. 4:
s301, in a calculation period, a sampling value of the current I is obtained by the PID controller to serve as a first current sampling value, and the PID controller outputs a target peak current in the calculation period according to the first current sampling value and a set target average current.
S302, calculating the average value of the target peak current according to the target peak current and the phase number of the DCDC converter.
S303, carrying out slope compensation on the average value of the target peak current to form a compensated peak current.
Illustratively, the purpose of slope compensating the average value of the target peak current is to avoid the problem of generating a larger ripple in the DCDC conversion circuit due to the duty cycle of the DCDC converter control signal generated based on the target peak current being greater than 50%.
For example, in this embodiment, the calculating manner of the slope compensation value is not limited, and alternatively, if the DCDC converter is a Boost converter, the slope compensation value may be a ratio of an input voltage of the DCDC converter to an inductance, and if the DCDC converter is a Buck converter, the slope compensation value may be a ratio of an output voltage of the DCDC converter to an inductance.
Illustratively, in this scheme, the average value of the target peak current is differenced from the slope compensation value to form the compensated peak current.
S304, determining a DCDC converter control signal of the one-phase DCDC conversion circuit according to the compensation peak current and the one-path second sampling current.
Illustratively, in this embodiment, the implementation manner of step S304 is similar to that described in step S203, and includes:
judging whether the second sampling current I1 is larger than the compensation peak current or not in a PWM signal period;
and if the second sampling current I1 is larger than the compensation peak current, triggering the original PWM signal to turn from a high level to a low level, and triggering the PWM signal to turn from the low level to the high level when the next PWM signal period starts, wherein a signal formed by the low level signal and the high level signal is the DCDC converter control signal PWM1.
Fig. 6 is a flowchart of another DCDC converter control method in the embodiment, and referring to fig. 6, the DCDC converter control method may be based on the scheme shown in fig. 5:
s401, in a calculation period, a sampling value of the current I is obtained by the PID controller to serve as a first current sampling value, and the PID controller outputs target peak current in the calculation period according to the first current sampling value and the set target average current.
S402, judging whether the target peak current of the current calculation period is the same as the target peak current of the previous calculation period.
In this embodiment, if the target peak currents of two adjacent calculation periods are different, the DCDC converter control signal of the current calculation period is determined again, and the following steps S403 to S405 are continued, otherwise, the DCDC converter control signal of the previous calculation period is used.
Illustratively, the computing resources of the controller may be conserved based on step S402.
S403, calculating the average value of the target peak current according to the target peak current and the phase number of the DCDC converter.
S404, performing slope compensation on the average value of the target peak current to form a compensated peak current.
S405, determining a DCDC converter control signal of the one-phase DCDC conversion circuit according to the compensation peak current and one-path second sampling current.
Example two
Fig. 7 is a schematic structural diagram of a DCDC converter control device in an embodiment, and referring to fig. 7, this embodiment proposes a DCDC converter control device, including:
the feedback control module 100, the feedback control module 100 is configured to determine a target peak current through the target average current and the first sampling current.
The slope compensation module 200, the slope compensation module 200 is configured to perform slope compensation on the target peak current or the average value of the target peak current to form a compensated peak current.
The DCDC converter control module 300, the DCDC converter control module 200 is configured to generate a DCDC converter control signal according to the target peak current and the second sampling current.
In this embodiment, any one of the DCDC converter control methods described in the first embodiment may be implemented based on the feedback control module 100 and the DCDC converter control module 200, specifically:
the feedback control module 100 determines a target peak current from the target mean current and the first sampling current based on a feedback control algorithm.
The DCDC converter control module 200 receives the target peak current and generates a DCDC converter control signal based on the target peak current and the second sampling current.
In a calculation period, the feedback control module 100 obtains a first current sampling value, and based on a PID controller algorithm, the feedback control module 100 outputs a target peak current in the calculation period according to the first current sampling value and a set target average current.
The feedback control module 100 calculates a mean value of the target peak current based on the target peak current and the number of phases of the DCDC converter.
The DCDC converter control module 300 determines a DCDC converter control signal of the one-phase DCDC converter circuit according to the average value of the target peak current and the one-path second sampling current.
In a calculation period, the feedback control module 100 obtains a first current sampling value, and the feedback control module 100 outputs a target peak current in the calculation period according to the first current sampling value and a set target average current based on a PID control algorithm.
The feedback control module 100 calculates a mean value of the target peak current based on the target peak current and the number of phases of the DCDC converter.
The ramp compensation module 200 performs a ramp compensation on the average value of the target peak current to form a compensated peak current.
And determining a DCDC converter control signal of the one-phase DCDC conversion circuit according to the compensation peak current by one path of second sampling current.
In a calculation period, the feedback control module 100 obtains a first current sampling value, and based on a PID controller algorithm, the feedback control module 100 outputs a target peak current in the calculation period according to the first current sampling value and a set target average current.
The feedback control module 100 determines whether the target peak current of the current calculation cycle is the same as the target peak current of the previous calculation cycle.
The feedback control module 100 calculates a mean value of the target peak current based on the target peak current and the number of phases of the DCDC converter.
The ramp compensation module 200 performs a ramp compensation on the average value of the target peak current to form a compensated peak current.
The DCDC converter control module 300 determines a DCDC converter control signal of the one-phase DCDC converter circuit according to the compensated peak current and the one-path second sampling current.
In this embodiment, the advantages of the DCDC converter control device are the same as those described in the first embodiment.
Example III
The embodiment provides a DCDC converter control system, which includes a controller, wherein the controller configures an executable program, and the executable program implements any one of the DCDC converter control methods described in the first embodiment when running.
Optionally, in this embodiment, the controller includes an ADC module, and the ADC module is configured to collect the first sampling current.
In this embodiment, the DCDC converter control system further includes a current sensor, where one current sensor is connected in series in a one-phase DCDC conversion circuit of the DCDC converter, the current sensor is connected to the controller, and the current sensor is used for collecting the second sampling current.
In this embodiment, the beneficial effects of the DCDC converter control system are the same as those described in the first embodiment.
Note that the above is only a preferred embodiment of the present invention and the technical principle applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, while the invention has been described in connection with the above embodiments, the invention is not limited to the embodiments, but may be embodied in many other equivalent forms without departing from the spirit or scope of the invention, which is set forth in the following claims.
Claims (7)
1. A DCDC converter control method, comprising:
determining a target peak current through the target average current and the first sampling current based on a feedback control algorithm; the target average current is expected current in a load loop where the DCDC converter is located, and the first sampling current is average current in the load loop where the DCDC converter is located;
receiving a target peak current, and generating a DCDC converter control signal according to the target peak current and a second sampling current; the target peak current is an expected peak value of current in a load loop where the DCDC converter is located, and the second sampling current is a current sampling value corresponding to a one-phase DCDC conversion circuit in a DCDC conversion structure;
the target average current is taken as an input, the first sampling current is taken as feedback, the target peak current is taken as an output to form an external current control loop, and the target peak current, the second sampling current is taken as an input, and the DCDC converter control signal is taken as an output to form an internal current control loop;
the circuit also comprises a plurality of second sampling currents, wherein one second sampling current corresponds to the one-phase DCDC conversion circuit;
taking the average value of the second sampling current and the target peak current as input, and taking the DCDC converter control signal of the one-phase DCDC conversion circuit as output to form an internal current control loop;
wherein, the average value of the target peak current is determined by the total path number of the target peak current and the second sampling current;
when the next calculation period is entered, judging whether the target peak current of the current calculation period is the same as the target peak current of the previous calculation period;
if the target peak currents of the two adjacent calculation periods are different, the DCDC converter control signal of the current calculation period is determined again, otherwise, the DCDC converter control signal of the previous calculation period is used;
the method further comprises the step of carrying out slope compensation on the average value of the target peak current to form a compensated peak current;
and taking one path of the second sampling current and the compensation peak current as inputs, and taking a DCDC converter control signal of the one-phase DCDC conversion circuit as an output to form an internal current control loop.
2. The DCDC converter control method of claim 1, wherein determining whether one of the second sampled currents is greater than a mean value of the target peak currents;
and if one path of the second sampling current is larger than the average value of the target peak current, generating a low-level signal, otherwise, generating a high-level signal, wherein the low-level signal and the high-level signal form a PWM signal, and the PWM is a DCDC converter control signal corresponding to the one-phase DCDC conversion circuit.
3. The DCDC converter control method of claim 1, including determining a slope compensation value, and differencing the average value of the target peak current with the slope compensation value to form a compensated peak current.
4. The DCDC converter control method of claim 1, wherein the feedback control algorithm employs a PID controller algorithm.
5. A DCDC converter control apparatus, comprising:
the feedback control module is used for determining a target peak current through the target average current and the first sampling current;
and the DCDC converter control module is used for generating a DCDC converter control signal according to the target peak current and the second sampling current.
6. A DCDC converter control system, characterized by comprising a controller configured with an executable program that, when run, implements the DCDC converter control method of any of claims 1 to 4.
7. The DCDC converter control system of claim 6, wherein the controller includes an ADC module for the acquisition of the first sampling current; the system further comprises a current sensor for acquisition of a second sampling current.
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| CN202111119902.3A CN113746339B (en) | 2021-09-24 | 2021-09-24 | DCDC converter control method, device and system |
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| CN113746339B true CN113746339B (en) | 2023-11-17 |
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| CN203135724U (en) * | 2013-02-27 | 2013-08-14 | 成都芯源系统有限公司 | Switch converter and slope compensation circuit thereof |
| CN104038048A (en) * | 2013-03-04 | 2014-09-10 | Nxp股份有限公司 | Boost converter |
| CN110739857A (en) * | 2019-10-30 | 2020-01-31 | 西北工业大学 | Current sharing control method of multiphase interleaving parallel LLC converters |
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| AU2003233126A1 (en) * | 2002-06-04 | 2003-12-19 | Koninklijke Philips Electronics N.V. | Dc-dc converter |
| CN102143628B (en) * | 2010-01-29 | 2013-05-08 | 成都芯源系统有限公司 | Circuit and method and lamp using circuit |
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| CN203135724U (en) * | 2013-02-27 | 2013-08-14 | 成都芯源系统有限公司 | Switch converter and slope compensation circuit thereof |
| CN104038048A (en) * | 2013-03-04 | 2014-09-10 | Nxp股份有限公司 | Boost converter |
| CN110739857A (en) * | 2019-10-30 | 2020-01-31 | 西北工业大学 | Current sharing control method of multiphase interleaving parallel LLC converters |
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| Decoupled PI Controllers Based on Pulse-Frequency Modulation for Current Sharing in Multi-Phase LLC Resonant Converters;Martin Moreno;《IEEE ACCESS》;第9卷;第15283 – 15294页 * |
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