CN114785103A - Method and device for controlling voltage ripple of three-level circuit and electronic equipment - Google Patents

Method and device for controlling voltage ripple of three-level circuit and electronic equipment Download PDF

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Publication number
CN114785103A
CN114785103A CN202210703596.6A CN202210703596A CN114785103A CN 114785103 A CN114785103 A CN 114785103A CN 202210703596 A CN202210703596 A CN 202210703596A CN 114785103 A CN114785103 A CN 114785103A
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switch
level circuit
power unit
state
current
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CN114785103B (en
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李建民
许超
宋海艳
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Shaoxing Yuanfang Semiconductor Co Ltd
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Shaoxing Yuanfang Semiconductor Co Ltd
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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
    • H02M1/14—Arrangements for reducing ripples from dc input or output
    • 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
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/483—Converters with outputs that each can have more than two voltages levels
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Dc-Dc Converters (AREA)

Abstract

The invention relates to the technical field of converters, and discloses a method and a device for controlling voltage ripples of a three-level circuit and electronic equipment. The method comprises the following steps: detecting whether the inductive current flowing through the inductor in the three-level circuit needs to be adjusted; when the reduction is detected, if the circuit is in a boosting or boosting and reducing mode, inserting a second time period into the first time period in which each section of power unit operates in the first state, and switching the power unit to operate in the second state in the second time period; if the power unit is in the boost mode, the inductive current is reduced when the power unit operates in a first state; when the voltage needs to be increased, if the circuit is in a voltage reduction or voltage increase and decrease mode, inserting a third time period into the first time period, and switching the power unit to operate in a third state in the third time period; if the circuit is in the buck mode, the inductor current rises when the power unit operates in the first state. The inductor current can quickly track the load current, so that the output voltage ripple of the three-level circuit is reduced.

Description

Control method and device for voltage ripple of three-level circuit and electronic equipment
Technical Field
The invention relates to the technical field of converters, in particular to a method and a device for controlling voltage ripples of a three-level circuit and electronic equipment.
Background
The three-level circuit may operate in a Buck mode (Buck), a Buck-Boost mode (Buck-Boost), and a Boost mode (Boost). The voltage higher or lower than the input voltage can be flexibly output through mode switching so as to meet the requirements of subsequent circuit units in the equipment. At present, three-level circuits are increasingly applied to devices such as mobile phones due to their excellent performance.
However, when the three-level circuit is operated under an ac load with a relatively high frequency, an ideal load current tracking capability may not be achieved, so that a relatively large voltage ripple may be generated during the process of adjusting the voltage input to the three-level circuit, which may affect the normal use of the device.
Disclosure of Invention
An object of an embodiment of the present invention is to provide a method and an apparatus for controlling a voltage ripple of a three-level circuit, and an electronic device, so as to reduce the voltage ripple of the three-level circuit.
In order to achieve the above object, an embodiment of the present invention provides a method for controlling a level circuit voltage ripple, including: detecting whether the inductive current needs to be adjusted; wherein the inductor current is a current flowing through an inductor in the three-level circuit; under the condition that the inductive current needs to be reduced, if the three-level circuit is in a boost mode or a buck-boost mode, inserting a second time period into a first time period in which each preset power unit operates in a first state, and switching the power unit to operate in a second state within the second time period; wherein the power unit is a power unit of the three-level circuit; wherein if the three-level circuit is in a boost mode, the inductor current is in a droop process when the power unit operates in the first state; under the condition that the inductive current needs to be increased, if the three-level circuit is in a voltage reduction mode or a voltage increase and decrease mode, inserting a third time period into each preset first time period in which the power unit operates in the first state, and switching the power unit to operate in the third state within the third time period; wherein if the three-level circuit is in a buck mode, the inductor current is in a boost process when the power unit is operating in the first state.
In order to achieve the above object, an embodiment of the present invention further provides a control apparatus for a three-level circuit voltage ripple, including: the current detection module is used for detecting whether the inductive current needs to be adjusted or not; wherein the inductor current is a current flowing through an inductor in the three-level circuit; the first current regulating module is used for inserting a second time period into a first time period in which each preset power unit operates in a first state under the condition that the inductive current needs to be reduced and if the three-level circuit is in a boost mode or a buck-boost mode, and switching the power unit to operate in a second state within the second time period; wherein the power unit is a power unit of the three-level circuit; wherein if the three-level circuit is in a boost mode, the inductor current is in a droop process when the power unit operates in the first state; the second current regulating module is used for inserting a third time period into the first time period in which each preset power unit operates in the first state if the three-level circuit is in a buck mode or a buck-boost mode under the condition that the inductive current needs to be increased, and switching the power unit to operate in the third state in the third time period; wherein if the three-level circuit is in a buck mode, the inductor current is in a boost process when the power unit is operating in the first state.
In order to achieve the above object, an embodiment of the present invention also provides an electronic device including: at least one processor; and a memory communicatively coupled to the at least one processor; the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor to enable the at least one processor to execute the control method for the three-level circuit voltage ripple.
Since the inductive current and the load current are directly related to the voltage ripple of the three-level circuit, in the embodiment of the invention, firstly, whether the inductive current needs to be adjusted is detected and judged; the inductor current is a current flowing through an inductor in the three-level circuit.
Under the condition that the inductive current needs to be reduced, if the three-level circuit is in a boost mode or a buck-boost mode, inserting a second time period into a first time period in which each preset power unit operates in a first state, and switching the power unit to operate in a second state within the second time period; wherein the power unit is a power unit of the three-level circuit; wherein if the three-level circuit is in a boost mode, the inductor current is in a droop process when the power unit is operating in the first state. The change rate of the inductive current in the process of decreasing is not limited to the corresponding change rate of the power unit in the first state, so that the speed of the change of the inductive current is increased, and the voltage ripple is effectively reduced.
Under the condition that the inductive current needs to be increased, if the three-level circuit is in a buck mode or a buck-boost mode, inserting a third time period into each preset first time period in which the power unit operates in the first state, and switching the power unit to operate in the third state within the third time period; wherein if the three-level circuit is in a buck mode, the inductor current is in a boost process when the power unit is operating in the first state. The change rate of the inductive current in the rising process is not limited to the corresponding change rate of the power unit in the first state, so that the speed of the change of the inductive current is increased, and the voltage ripple is effectively reduced.
Drawings
One or more embodiments are illustrated by way of example in the accompanying drawings, which correspond to the figures in which like reference numerals refer to similar elements and which are not to scale unless otherwise specified.
Fig. 1 is a schematic flowchart of a control method for a three-level circuit voltage ripple according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a three-level circuit according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a power cell in a three-level circuit according to an embodiment of the present invention;
FIG. 4 is a schematic flow diagram illustrating current flow when the power cell is operating in the first state according to an embodiment of the present invention;
FIG. 5 is a schematic flow diagram illustrating current flow when the power cell operates in the second state according to an embodiment of the present invention;
FIG. 6 is a schematic flow diagram illustrating current flow when the power cell is operating in the third state according to an embodiment of the present invention;
FIG. 7 is a schematic diagram of a circuit configuration for detecting a capacitor current according to an embodiment of the present invention;
FIG. 8 is a schematic diagram of a circuit configuration for detecting an output voltage according to an embodiment of the present invention;
fig. 9 is a schematic structural diagram of a control device for a three-level circuit voltage ripple according to an embodiment of the present invention;
fig. 10 is a schematic structural diagram of an electronic device according to another embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, it will be appreciated by those of ordinary skill in the art that numerous technical details are set forth in order to provide a better understanding of the present application in various embodiments of the present invention. However, the technical solution claimed in the present application can be implemented without these technical details and various changes and modifications based on the following embodiments.
In the description of the present invention, it is to be understood that the terms "comprises" and "comprising," and any variations thereof, as used herein, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. It should be understood that the term "and/or" as used herein is merely one type of association that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood according to specific situations by those of ordinary skill in the art.
One embodiment of the present invention relates to a method for controlling a three-level circuit voltage ripple, including: detecting whether the inductive current needs to be adjusted; wherein the inductor current is a current flowing through an inductor in the three-level circuit; under the condition that the inductive current needs to be reduced, if the three-level circuit is in a boost mode or a buck-boost mode, inserting a second time period into a first time period in which each preset power unit operates in a first state, and switching the power unit to operate in a second state within the second time period; wherein the power unit is a power unit of the three-level circuit; wherein if the three-level circuit is in a boost mode, the inductor current is in a droop process when the power unit operates in the first state; under the condition that the inductive current needs to be increased, if the three-level circuit is in a buck mode or a buck-boost mode, inserting a third time period into each preset first time period in which the power unit operates in the first state, and switching the power unit to operate in the third state within the third time period; wherein if the three-level circuit is in a buck mode, the inductor current is in a boost process when the power unit is operating in the first state.
The implementation details of the control method for the three-level circuit voltage ripple in this embodiment are specifically described below, and the following description is only for facilitating understanding of the implementation details of this solution, and is not necessary to implement this solution. The specific process is shown in fig. 1, and may include the following steps:
step 101, detecting whether the inductive current needs to be adjusted; the inductor current is a current flowing through an inductor in the three-level circuit.
In an embodiment of the present invention, in particular, a three-level circuit may include a power unit, a driving unit, and a control unit. The specific structure may refer to a schematic structure shown in fig. 2, the power unit may refer to a "power stage" shown in fig. 2, the driving unit may refer to a "driving stage" shown in fig. 2, and the control unit may refer to a "control stage" shown in fig. 2. Wherein, the power unit includes: a first switch, a second switch, a third switch, a fourth switch, a fifth switch (shown as S1-S5 in FIG. 2), and an output capacitor (shown as C in FIG. 2)outShown), input capacitance (as C in fig. 2)inShown), flying capacitor (as shown in fig. 2CflyShown), the inductance (shown as L in fig. 2), and the load; the first switch, the second switch, the third switch, the fourth switch is established ties in proper order, the fifth switch is parallelly connected in series the first switch, the second switch, the both ends of third switch, the first end of fourth switch with the third switch is connected, the second end ground connection of fourth switch, the first end of inductance with the second switch with the junction of third switch links to each other, the second end of inductance with the second end of output capacitance links to each other, the first end of output capacitanceThe second end of the fourth switch is connected, the first end of the flying capacitor is connected with the joint of the first switch and the second switch, the second end of the flying capacitor is connected with the third switch and the joint of the fourth switch and the fifth switch, the first end of the input capacitor is connected with the joint of the first switch and the fifth switch, the second end of the input capacitor is grounded, the voltage input end of the three-level circuit is connected with the joint of the first switch and the fifth switch, and the voltage output end of the three-level circuit is connected with the joint of the inductor and the output capacitor. The schematic diagram of the power unit can refer to fig. 3.
Further, in the circuit configuration as shown in fig. 2 or fig. 3, when the power unit operates in the first state, the first switch, the second switch, and the fourth switch are closed, and the third switch and the fifth switch are opened. In this case, the schematic flow of current in the power unit can be as shown in fig. 4. The specific current flow direction may be shown by the current flow direction indicated by φ 1 shown in FIG. 4.
When the power cell is operating in the second state, the first, third, and fourth switches are closed, and the second and fifth switches are open. In this case, the schematic flow of current in the power unit may be as shown in fig. 5. The specific current flow direction may be shown by the current flow direction indicated by φ 2 shown in FIG. 5.
When the power cell is operating in the third state, the first, third, and fourth switches are open, and the second and fifth switches are closed. In this case, the schematic flow of current in the power unit can be as shown in fig. 6. The specific current flow direction may be shown by the current flow direction indicated by φ 3 shown in FIG. 6.
The three-level circuit realizes a voltage boosting and reducing function by using the voltage pump and the Buck circuit, and can work in a voltage reduction mode (Buck), a voltage boosting and reducing mode (Buck-Boost) and a voltage boosting mode (Boost). When the three-level circuit shown in FIG. 2 is operated in the buck mode, the voltage at the LX point is at the input voltage and the ground voltageAlternately switched in between. Further, the three-level circuit can output an output voltage lower than the input voltage through the LC filter circuit. Specifically, the three-level circuit is in a step-down mode, and can be realized by controlling the power unit to switch between a first state and a second state periodically. It should be noted that when the three-level circuit is in the buck mode, the inductor current rises when the power unit operates in the first state, and the slope of the rising curve is (V)in-Vout) L; when the power unit operates in the second state, the inductive current decreases, and the slope of the decreasing curve is Vout/L。
When the three-level circuit shown in fig. 2 operates in the boost mode, the voltage at the LX point is alternately switched between the input voltage doubled and the input voltage. Furthermore, the three-level circuit can output an output voltage which is higher than the input voltage and less than twice the input voltage through the LC filter circuit. In particular, the three-level circuit is in a boost mode, which may be achieved by controlling the power cell to periodically switch between the first state and the third state. It should be noted that when the three-level circuit is in the boost mode, the inductor current decreases when the power unit operates in the first state, and the slope of the decreasing curve is (V)out-Vin) L; when the power unit operates in the third state, the inductive current rises, and the slope of the rising curve is (2 xV)in-Vout）/L。
When the three-level circuit shown in fig. 2 operates in the buck-boost mode, the voltage at the LX point switches between twice the input voltage, the input voltage and the ground voltage. Further, the three-level circuit can output an output voltage close to the input voltage by the LC filter circuit. Specifically, the three-level circuit is in a buck-boost mode, and may be implemented by controlling the power unit to periodically switch among the third state, the first state, and the second state in sequence. It should be noted that when the three-level circuit is in the buck-boost mode and the power unit operates in the third state, the inductor current rises and the slope of the rising curve is (2 xV)in-Vout) L; when the power unit operates in the second state, the inductive current decreases, and the slope of the decreasing curve is VoutL; when the power unit operates in the first state, the inductive current is almost unchanged, and V isin>VoutWhen the current rises slightly, the slope of the rising curve is (V)in-Vout）/L；Vin<VoutThe inductor current slightly decreases and the slope of the rising curve is (V)out-Vin）/L。
The driving unit includes a first Driver, a second Driver, a third Driver, a fourth Driver and a fifth Driver (refer to Driver _ S1 to Driver _ S5 shown in fig. 2), an output terminal of the first Driver is connected to the control terminal of the first switch, an output terminal of the second Driver is connected to the control terminal of the second switch, an output terminal of the third Driver is connected to the control terminal of the third switch, an output terminal of the fourth Driver is connected to the control terminal of the fourth switch, and an output terminal of the fifth Driver is connected to the control terminal of the fifth switch;
the control unit comprises a Boost signal output end (refer to T _ Boost shown in FIG. 2) and a Buck signal output end (refer to T _ Buck shown in FIG. 2); a forward output end of the boosting signal output end is connected with an input end of the fifth driver, and a reverse output end of the boosting signal output end is connected with an input end of the first driver and an input end of the fourth driver; the forward output end of the voltage reduction signal output end is connected with the input end of the third driver, and the reverse output end of the voltage boosting signal output end is connected with the input end of the second driver. It is also worth mentioning that each driver may include a power switch driving circuit, a dead time control circuit, a level shift circuit, an enable circuit, etc. as required.
The table of the correspondence between the control signal and the state of the power unit and the on-off state of each switch in the power unit is shown in table 1:
TABLE 1 corresponding relationship table of control signal, power unit state and on-off condition of each switch
Boost signal Step-down signal Power cell state First switch Second switch Third switch Fourth switch Fifth switch
0 0 First state Closing is carried out Closure is provided Disconnect Closing is carried out Disconnect
0 1 Second state Closure is provided Break off Closure is provided Closing is carried out Break off
1 0 Third state Break off Closure is provided Disconnect Break off Closing is carried out
In an example, the detecting whether the inductor current needs to be adjusted or not in this step may specifically include: detecting a capacitance current flowing through an output capacitance of the three-level circuit; under the condition that the capacitance current is higher than a first preset threshold value, judging that the inductance current needs to be reduced; and under the condition that the capacitance current is lower than a second preset threshold value, judging that the inductance current needs to be increased.
When the capacitance current flowing through the output capacitor of the three-level circuit exceeds a first preset threshold, it is indicated that the inductance current is higher than the load current, and the inductance current is too high and needs to be reduced. It can be understood that, when the capacitance current flowing through the output capacitor of the three-level circuit is lower than the second preset threshold, it indicates that the inductance current is lower than the load current, and the inductance current is too low and needs to be increased.
In this example, detecting the capacitance current flowing through the output capacitor of the three-level circuit may specifically include: and detecting the capacitance current flowing through the output capacitor of the three-level circuit by a capacitance current detection circuit. Fig. 7 can be referred to as a schematic circuit diagram of a circuit configuration for detecting a capacitance current flowing through an output capacitor of the three-level circuit by using a capacitance current detection circuit.
Further, it is noted that, in the three-level circuit shown in fig. 7, after the detection of the capacitance current is completed by the capacitance current detection circuit, the detected capacitance current may be output to an inductance current acceleration determination unit (see "inductance current acceleration determination" shown in fig. 7) connected to the capacitance current detection circuit. It can be understood that the inductive current acceleration determination unit can compare the received capacitive current with a first preset threshold or a second preset threshold, and send a control signal to the control unit of the three-level circuit after obtaining the comparison result, and the control unit inserts the second time period or the third time period into the first time period.
In another example, the detecting whether the inductor current needs to be adjusted or not in this step may further specifically include: detecting an output voltage of the three-level circuit; under the condition that the output voltage is reduced to be lower than a preset reference voltage, judging that the inductive current needs to be increased; and judging that the inductive current needs to be reduced under the condition that the output voltage is increased to be higher than the preset reference voltage.
Specifically, in this embodiment, the comp current detection circuit unit and the inductor current acceleration determination unit connected to the three-level circuit may be utilized to detect the output voltage of the three-level circuit, and control the operation state of the power unit according to the detection result. Fig. 8 may be referred to as a schematic diagram of the circuit structure according to this example. In the comp current detection circuit unit and the inductor current acceleration determination unit shown in fig. 8 (as shown in "comp current detection circuit and inductor current acceleration determination" in fig. 8), V output from an Error Amplifier (EA) may be used_compThe charging and discharging current of (2) reflects error information of the output voltage of the three-level circuit. In addition, in order to eliminate the disturbance caused by the switching period, the current can be processed to a certain degree.
102, under the condition that the inductive current needs to be reduced, if the three-level circuit is in a boost mode or a buck-boost mode, inserting a second time period into a first time period in which each preset power unit operates in a first state, and switching the power unit to operate in a second state within the second time period; wherein the power unit is a power unit of the three-level circuit; wherein if the three-level circuit is in a boost mode, the inductor current is in a droop process when the power unit is operating in the first state.
When the three-level circuit is in a boost mode and the power unit operates in a first state, the inductive current decreases, and the slope of a decreasing curve is (V)out-Vin) And L. The inductor current may change at a slow rate, and thus a large voltage ripple may be generated during the process of adjusting the voltage input to the three-level circuit, which may affect the normal use of the device.
103, under the condition that the inductor current needs to be increased, if the three-level circuit is in a buck mode or a buck-boost mode, inserting a third time period into each preset first time period in which the power unit operates in the first state, and switching the power unit to operate in the third state within the third time period; wherein if the three-level circuit is in a buck mode, the inductor current is in a boost process when the power unit is operating in the first state.
When the three-level circuit is in a voltage reduction mode and the power unit operates in a first state, the inductive current rises, and the slope of a rising curve is (V)in-Vout) L is the ratio of the total weight of the composition to the total weight of the composition. The inductor current may change at a slow rate, and thus a large voltage ripple may be generated during the process of adjusting the voltage input to the three-level circuit, which may affect the normal use of the device.
It is worth mentioning that a certain delay or time delay may be added in the step of detecting whether the inductor current needs to be adjusted, so as to increase the robustness.
For a three-level circuit, the ripple of the output voltage depends on the current flowing through the output capacitor (Δ v = Ic Δ t/C), which is the difference between the inductor current and the load current (Ic = I)L-Io). When the inductor current can quickly track the change of the load current, the current change of the output capacitor is very small, and the output voltage ripple is very small. When the change of the load current cannot be well tracked by the inductive current, the current change of the output capacitor is large, and the output voltage ripple waveIt becomes larger.
Since the inductive current is directly related to the voltage ripple of the three-level circuit, in the embodiment of the present invention, first, whether the inductive current needs to be adjusted is detected and judged; the inductor current is a current flowing through an inductor in the three-level circuit.
Under the condition that the inductive current needs to be reduced, if the three-level circuit is in a boost mode or a buck-boost mode, inserting a second time period into a first time period in which each preset power unit operates in a first state, and switching the power unit to operate in a second state within the second time period; wherein the power unit is a power unit of the three-level circuit; if the three-level circuit is in a boost mode, the inductor current is in a falling process when the power unit operates in the first state. The change rate of the inductive current in the reduction process is not limited to the corresponding change rate of the power unit in the first state, so that the speed of the change of the inductive current is increased, namely, the load current tracking capability of the three-level circuit is improved, and further, the voltage ripple can be effectively reduced.
Under the condition that the inductive current needs to be increased, if the three-level circuit is in a buck mode or a buck-boost mode, inserting a third time period into each preset first time period in which the power unit operates in the first state, and switching the power unit to operate in the third state within the third time period; wherein if the three-level circuit is in a buck mode, the inductor current is in a boost process when the power unit is operating in the first state. The change rate of the inductive current in the rising process is not limited to the corresponding change rate of the power unit in the first state, so that the change speed of the inductive current is increased, and the voltage ripple is effectively reduced.
When the embodiment detects that the inductive current needs to be adjusted, the time for enabling the power unit to operate in the second state or the third state is inserted into the preset time for enabling the power unit of the three-level circuit to operate in the first state, so that the change rate of the inductive current of the three-level circuit is improved, the load current tracking capability of the inductive current is improved, and the voltage ripple is reduced.
One embodiment of the present invention relates to a control device for a three-level circuit voltage ripple, as shown in fig. 9, including:
a current detection module 901, configured to detect whether the inductor current needs to be adjusted; wherein the inductor current is a current flowing through an inductor in the three-level circuit;
a first current adjusting module 902, configured to insert a second time period into a first time period in which each preset power unit operates in a first state if the three-level circuit is in a boost mode or a buck-boost mode when it is detected that the inductor current needs to be reduced, and switch the power unit to operate in a second state within the second time period; wherein the power unit is a power unit of the three-level circuit; if the three-level circuit is in a boost mode, the inductor current is in a falling process when the power unit operates in the first state;
a second current adjusting module 903, configured to insert a third time period into each preset first time period in which the power unit operates in the first state if the three-level circuit is in a buck mode or a buck-boost mode when it is detected that the inductor current needs to be increased, and switch the power unit to operate in the third state within the third time period; wherein if the three-level circuit is in a buck mode, the inductor current is in a boost process when the power unit is operating in the first state.
In an example, the current detecting module 901 may be further configured to detect a capacitance current flowing through an output capacitor of the three-level circuit; under the condition that the capacitance current is higher than a first preset threshold value, judging that the inductance current needs to be reduced; and under the condition that the capacitance current is lower than a second preset threshold value, judging that the inductance current needs to be increased.
In another example, the current detecting module 901 may be further configured to detect an output voltage of the three-level circuit; judging that the inductive current needs to be increased under the condition that the output voltage is reduced to be lower than a preset reference voltage; and judging that the inductive current needs to be reduced under the condition that the output voltage is increased to be higher than the preset reference voltage.
For a three-level circuit, when the three-level circuit operates under an alternating current load with a higher frequency, the change rate of an inductive current in the three-level circuit is limited, and the change speed of the inductive current is possibly slower, so that a larger voltage ripple can be generated in the process of regulating the voltage input into the three-level circuit, and the normal use of equipment is influenced.
Since the inductive current is directly related to the voltage ripple of the three-level circuit, in the embodiment of the present invention, first, whether the inductive current needs to be adjusted is detected and judged; the inductor current is a current flowing through an inductor in the three-level circuit.
Under the condition that the inductive current needs to be reduced, if the three-level circuit is in a boost mode or a buck-boost mode, inserting a second time period into a first time period in which each preset power unit operates in a first state, and switching the power unit to operate in a second state within the second time period; wherein the power unit is a power unit of the three-level circuit; if the three-level circuit is in a boost mode, the inductor current is in a falling process when the power unit operates in the first state. The change rate of the inductive current in the reduction process is not limited to the corresponding change rate of the power unit in the first state, so that the speed of the change of the inductive current is increased, and the voltage ripple is effectively reduced.
Under the condition that the inductive current needs to be increased, if the three-level circuit is in a buck mode or a buck-boost mode, inserting a third time period into each preset first time period in which the power unit operates in the first state, and switching the power unit to operate in the third state within the third time period; wherein if the three-level circuit is in a buck mode, the inductor current is in a boost process when the power unit is operating in the first state. The change rate of the inductive current in the rising process is not limited to the corresponding change rate of the power unit in the first state, so that the speed of the change of the inductive current is increased, and the voltage ripple is effectively reduced.
It should be noted that, all the modules related in the foregoing embodiments of the present invention are logic modules, and in practical applications, one logic unit may be one physical unit, may also be a part of one physical unit, and may also be implemented by a combination of multiple physical units. In addition, in order to highlight the innovative part of the present invention, elements that are not so closely related to solving the technical problems proposed by the present invention are not introduced in the present embodiment, but this does not indicate that other elements are not present in the present embodiment.
Embodiments of the present invention also provide an electronic device, as shown in fig. 10, including at least one processor 1001; and memory 1002 communicatively coupled to the at least one processor 1001; the memory 1002 stores instructions executable by the at least one processor 1001, and the instructions are executed by the at least one processor 1001, so that the at least one processor 1001 can execute the method for controlling the three-level circuit voltage ripple.
The memory 1002 and the processor 1001 are coupled by a bus, which may comprise any number of interconnecting buses and bridges that interconnect one or more of the various circuits of the processor 1001 and the memory 1002. The bus may also connect various other circuits such as peripherals, voltage regulators, power management circuits, etc., which are well known in the art, and therefore, will not be described any further herein. A bus interface provides an interface between the bus and the transceiver. The transceiver may be one element or a plurality of elements, such as a plurality of receivers and transmitters, providing a means for communicating with various other apparatus over a transmission medium. The data processed by the processor 1001 is transmitted over a wireless medium through an antenna, which further receives the data and transmits the data to the processor 1001.
The processor 1001 is responsible for managing the bus and general processing and may provide various functions including timing, peripheral interfaces, voltage regulation, power management, and other control functions. And the memory 1002 may be used for storing data used by the processor 1001 in performing operations.
It should be noted that the electronic device according to this embodiment, which is capable of executing the method for controlling the voltage ripple of the three-level circuit, may further include an analog signal detection and processing circuit and a logic control circuit. The analog signal detection and processing circuit detects the analog semaphore of the three-level circuit, processes the analog semaphore and generates a voltage boosting control signal and a voltage reducing control signal through the logic control circuit. Analog semaphores include, but are not limited to, output voltage, input voltage, inductor current, and the like. The analog semaphore is processed by, but not limited to, filtering, amplification, integration, differentiation, comparison, delay, etc.
The product can execute the method provided by the embodiment of the application, has corresponding functional modules and beneficial effects of the execution method, and can refer to the method provided by the embodiment of the application without detailed technical details in the embodiment.
The above-described embodiments are provided to enable persons skilled in the art to make and use the invention, and modifications and variations can be made to the above-described embodiments by persons skilled in the art without departing from the inventive concept of the present application, so that the scope of protection of the present invention is not limited by the above-described embodiments but should be accorded the widest scope of the inventive features set forth in the appended claims.

Claims (9)

1. A method for controlling voltage ripples of a three-level circuit is characterized by comprising the following steps:
detecting whether the inductive current needs to be adjusted; wherein the inductor current is a current flowing through an inductor in the three-level circuit;
under the condition that the inductive current needs to be reduced, if the three-level circuit is in a boost mode or a buck-boost mode, inserting a second time period into a first time period in which each preset power unit operates in a first state, and switching the power unit to operate in a second state within the second time period; wherein the power unit is a power unit of the three-level circuit; wherein if the three-level circuit is in a boost mode, the inductor current is in a droop process when the power unit operates in the first state;
under the condition that the inductive current needs to be increased, if the three-level circuit is in a voltage reduction mode or a voltage increase and decrease mode, inserting a third time period into each preset first time period in which the power unit operates in the first state, and switching the power unit to operate in the third state within the third time period; wherein if the three-level circuit is in a buck mode, the inductor current is in a boost process when the power unit is operating in the first state.
2. The method for controlling voltage ripple of three-level circuit according to claim 1, wherein said detecting whether the inductor current needs to be adjusted comprises:
detecting a capacitance current flowing through an output capacitance of the three-level circuit;
under the condition that the capacitance current is higher than a first preset threshold value, judging that the inductance current needs to be reduced;
and under the condition that the capacitance current is lower than a second preset threshold value, judging that the inductance current needs to be increased.
3. The method for controlling voltage ripple of a three-level circuit according to claim 2, wherein the detecting a capacitance current flowing through an output capacitor of the three-level circuit comprises:
and detecting the capacitance current flowing through the output capacitor of the three-level circuit by a capacitance current detection circuit.
4. The method for controlling voltage ripple of three-level circuit according to claim 1, wherein said detecting whether the inductor current needs to be adjusted comprises:
detecting an output voltage of the three-level circuit;
judging that the inductive current needs to be increased under the condition that the output voltage is reduced to be lower than a preset reference voltage;
and judging that the inductive current needs to be reduced under the condition that the output voltage is increased to be higher than the preset reference voltage.
5. The method for controlling voltage ripple of a three-level circuit according to any one of claims 1 to 4, wherein the three-level circuit comprises: the power unit, the driving unit and the control unit;
wherein the power unit includes: the first switch, the second switch, the third switch, the fourth switch, the fifth switch, the output capacitor, the input capacitor, the flying capacitor, the inductor and the load; the first switch, the second switch, the third switch and the fourth switch are sequentially connected in series, the fifth switch is connected in parallel at two ends of the first switch, the second switch and the third switch which are connected in series, the first end of the fourth switch is connected with the third switch, the second end of the fourth switch is grounded, the first end of the inductor is connected with the joint of the second switch and the third switch, the second end of the inductor is connected with the second end of the output capacitor, the first end of the output capacitor is connected with the second end of the fourth switch, the first end of the flying capacitor is connected with the joint of the first switch and the second switch, the second end of the flying capacitor is connected with the joint of the third switch, the fourth switch and the fifth switch, and the first end of the input capacitor is connected with the joint of the first switch and the fifth switch, the second end of the input capacitor is grounded, the voltage input end of the three-level circuit is connected to the joint of the first switch and the fifth switch, and the voltage output end of the three-level circuit is connected to the joint of the inductor and the output capacitor.
6. The method for controlling the three-level circuit voltage ripple of claim 5, wherein when the power unit operates in the first state, the first switch, the second switch, and the fourth switch are closed, and the third switch and the fifth switch are open; when the power cell is operating in the second state, the first, third, and fourth switches are closed, and the second and fifth switches are open; when the power unit operates in the third state, the first switch, the third switch, and the fourth switch are open, and the second switch and the fifth switch are closed.
7. The method according to claim 5, wherein the driving unit comprises a first driver, a second driver, a third driver, a fourth driver and a fifth driver, an output terminal of the first driver is connected to the control terminal of the first switch, an output terminal of the second driver is connected to the control terminal of the second switch, an output terminal of the third driver is connected to the control terminal of the third switch, an output terminal of the fourth driver is connected to the control terminal of the fourth switch, and an output terminal of the fifth driver is connected to the control terminal of the fifth switch;
the control unit comprises a boosting signal output end and a reducing signal output end; a forward output end of the boost signal output end is connected with an input end of the fifth driver, and a reverse output end of the boost signal output end is connected with an input end of the first driver and an input end of the fourth driver; the forward output end of the voltage reduction signal output end is connected with the input end of the third driver, and the reverse output end of the voltage boosting signal output end is connected with the input end of the second driver.
8. A control apparatus for a three-level circuit voltage ripple, comprising:
the current detection module is used for detecting whether the inductive current needs to be adjusted or not; wherein the inductor current is a current flowing through an inductor in the three-level circuit;
the first current regulation module is used for inserting a second time period into a first time period in which each preset power unit operates in a first state under the condition that the inductive current needs to be reduced and if the three-level circuit is in a boost mode or a buck-boost mode, and switching the power unit to operate in a second state within the second time period; wherein the power unit is a power unit of the three-level circuit; if the three-level circuit is in a boost mode, the inductor current is in a falling process when the power unit operates in the first state;
the second current regulating module is used for inserting a third time period into the first time period in which each preset power unit operates in the first state if the three-level circuit is in a buck mode or a buck-boost mode under the condition that the inductive current needs to be increased, and switching the power unit to operate in the third state in the third time period; wherein if the three-level circuit is in a buck mode, the inductor current is in a boost process when the power unit is operating in the first state.
9. An electronic device, comprising:
at least one processor; and the number of the first and second groups,
a memory communicatively coupled to the at least one processor; wherein the content of the first and second substances,
the memory stores instructions executable by the at least one processor to enable the at least one processor to perform the method of controlling three-level circuit voltage ripple as claimed in any one of claims 1 to 7.
CN202210703596.6A 2022-06-21 2022-06-21 Control method and device for voltage ripple of three-level circuit and electronic equipment Active CN114785103B (en)

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