Ripple compensation device

Abstract

The embodiment of the invention provides a ripple compensation device which is suitable for the technical field of electrical control. The ripple compensation device comprises a current generation module and a ripple superposition module, the ripple superposition module comprises a plurality of voltage-controlled current sources, and at least one target voltage-controlled current source exists in the plurality of voltage-controlled current sources. The current generation module obtains output voltage and generates adjusting current according to the output voltage, so that the target voltage-controlled current source generates self transconductance according to the adjusting current, a first transconductance value in linear relation with the output voltage is obtained, and then the ripple superposition module generates ripple signals according to the adjusted target voltage-controlled current source and other voltage-controlled current sources. Therefore, the output voltage of the DC-DC converter is compensated. On the basis, the transimpedance of the target voltage-controlled current source is adjusted, so that the target voltage-controlled current source is linearly changed along with the output voltage, the ripple of the direct current-direct current converter is adaptively compensated, and the stability of a control loop in the direct current-direct current converter under different output voltages is improved.

Description

Technical Field

[0001] This invention relates to the field of electrical control, and more specifically, to a ripple compensation device. Background Technology

[0002] Constant on / off time (COT) control mode in DC-DC converters is widely used in switching converters due to its excellent transient response and high efficiency under light load. Existing COT control modes typically generate a status indication signal (Ramp_OK) for controlling the switching converter using the input voltage Vin and the output voltage Vout, thereby causing the transistors in the switching converter to conduct alternately.

[0003] To improve the stability of COT control mode, a larger output capacitor with a larger equivalent series resistance (ESR) is usually selected. However, this method increases the voltage ripple of the output voltage in the DC-DC converter. Although the same ripple as the inductor current can be injected into the feedback terminal of the DC-DC converter for compensation, the injected ripple will affect the stability of the DC-DC converter with changes in input and output voltages, thus limiting its application scenarios.

[0004] Therefore, there is an urgent need for a ripple compensation scheme that can adaptively compensate for stability based on the output voltage. Summary of the Invention

[0005] In view of this, the purpose of the present invention is to provide a ripple compensation device. By setting a current generation module and a ripple superposition module, the current generation module provides an adjustment current to the ripple superposition module, so that the transimpedance of the target voltage-controlled current source under the ripple superposition module changes linearly with the output voltage. This makes the generated ripple signal change with the output voltage, thereby realizing adaptive compensation of the DC-DC converter, avoiding hard switching of the control loop, and improving the stability of the control loop in the DC-DC converter under different output voltages.

[0006] To achieve the above objectives, the technical solutions adopted in the embodiments of the present invention are as follows: In a first aspect, the present invention provides a ripple compensation device applied to a DC-DC converter. The DC-DC converter includes a drive module, and the ripple compensation device includes a current generation module and a ripple superposition module. The current generation module is connected to the ripple superposition module. The ripple superposition module includes multiple voltage-controlled current sources, and the output terminal of each voltage-controlled current source is connected to the input terminal of the drive module. The multiple voltage-controlled current sources include at least one target voltage-controlled current source. The current generation module is used to acquire the control parameters of the DC-DC converter, including the output voltage. The current generation module is also used to generate an adjustable current based on the output voltage; The target voltage-controlled current source is used to generate its own transconductance based on the adjustment current to obtain the first transconductance value; wherein, the first transconductance value is linearly related to the output voltage; The ripple superposition module is used to generate a ripple signal based on the adjusted target voltage-controlled current source and other voltage-controlled current sources besides the target voltage-controlled current source, so as to compensate the output voltage of the DC-DC converter.

[0007] Optionally, the current generation module includes a ripple compensation circuit and a square current generation circuit. The output terminal of the ripple compensation circuit is connected to the input terminal of the square current generation circuit; the output terminal of the square current generation circuit is connected to the power supply terminal of the target voltage-controlled current source. Among them, the ripple compensation circuit is used to obtain the modulation voltage based on the output voltage; A square current generating circuit is used to generate an adjustment current based on the modulation voltage; wherein the adjustment current is linearly related to the square of the output voltage.

[0008] Optionally, the formula for calculating the adjustment current satisfies: Igm=K1*Vout 2 ; Where Igm is the adjustment current; K1 is the first coefficient; and Vout is the output voltage.

[0009] Optionally, the target voltage-controlled current source is also used to adjust its own transconductance based on the sum of the adjustment current and the first bias current to obtain the first transconductance value; the first bias current is generated by the power supply. The formula for calculating the first transconductance value satisfies: Gmfb=K2*Vout +gmfb_0; Wherein, Gmfb is the first transconductance value, K2 is the second coefficient, Vout is the output voltage, and gmfb_0 is the transconductance value related to the target voltage-controlled current source and the first bias current.

[0010] Optionally, when the control parameters also include an output pulse signal, and the ripple superposition module includes a target voltage-controlled current source and a first voltage-controlled current source, the output terminal of the ripple compensation circuit is connected to the input terminal of the first voltage-controlled current source; the output terminals of the first voltage-controlled current source and the target voltage-controlled current source are connected to the input terminal of the drive module. Among them, the ripple compensation circuit is also used to generate the first differential signal pair based on the output pulse signal; The first voltage-controlled current source is used to generate its own transconductance based on the second bias current to obtain the second transconductance value; the second bias current is generated by the power supply. The ripple overlay module is also used to generate a ripple signal based on the first transconductance value, the second transconductance value, and the first differential signal.

[0011] Optionally, the formula for calculating the ripple signal is expressed as follows: Vrip = (vcsp-vcsn) / (Gmfb / Gmcs); In the formula, Vrip is the value of the ripple signal; vcsp is the voltage value of the positive phase terminal of the first differential signal pair; vcsn is the voltage value of the negative phase terminal of the first differential signal pair; Gmfb is the first transconductance value; and Gmcs is the second transconductance value.

[0012] Optionally, the ripple compensation device further includes a first resistor, the first end of which is connected to the output terminal of the first voltage-controlled current source, the output terminal of the target voltage-controlled current source, and the input terminal of the drive module; the second end of the first resistor is grounded.

[0013] Optionally, the ripple compensation device further includes a voltage divider module; the first terminal of the voltage divider module is used to receive the output voltage, the second terminal of the voltage divider module is connected to the first input terminal of the target voltage-controlled current source; the second input terminal of the target voltage-controlled current source is used to receive the reference voltage; and the third terminal of the voltage divider module is grounded. The voltage divider module is used to obtain the feedback voltage based on the output voltage, so that the drive module can adjust the on / off state of the switching transistors in the DC-DC converter based on the reference voltage and the feedback voltage.

[0014] Optionally, when the voltage-controlled current source includes a transconductance amplifier, the multiple voltage-controlled current sources include a first transconductance amplifier and a second transconductance amplifier; the power supply terminal of the first transconductance amplifier is used to receive an adjustment current and a first bias current; the power supply terminal of the second transconductance amplifier is used to receive a second bias current; the ground terminal of the first transconductance amplifier is connected to the ground terminal of the second transconductance amplifier and the input terminal of the drive module; the differential input terminal of the second transconductance amplifier is connected to the output terminal of the current generation module and is used to receive a first differential signal pair; the differential input terminal of the first transconductance amplifier is used to receive a second differential signal pair, and the second differential signal pair is used to characterize the differential signal pair related to the output voltage.

[0015] Optionally, the ripple compensation device further includes an error amplifier, the output of which is connected to the input of the drive module; the first input of the error amplifier is connected to the output of each voltage-controlled current source; and the second input of the error amplifier is connected to the positive terminal of the power supply.

[0016] The ripple compensation device provided in this embodiment of the invention has the following beneficial effects: The ripple compensation device in this application includes a current generation module and a ripple superposition module. The ripple superposition module includes multiple voltage-controlled current sources, at least one of which is a target voltage-controlled current source. The current generation module acquires and generates an adjustment current based on the output voltage, causing the target voltage-controlled current source to generate its own transconductance according to the adjustment current, obtaining a first transconductance value that is linearly related to the output voltage. Subsequently, the ripple superposition module generates a ripple signal based on the adjusted target voltage-controlled current source and the other voltage-controlled current sources to compensate the output voltage of the DC-DC converter. Based on this, the present invention provides an adjustment current to the ripple superposition module through the current generation module, making the transconductance of the target voltage-controlled current source under the ripple superposition module change linearly with the output voltage, thereby making the generated ripple signal change with the output voltage, realizing adaptive compensation of the DC-DC converter, avoiding hard switching of the control loop, and improving the stability of the control loop in the DC-DC converter under different output voltages.

[0017] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 A schematic diagram of the structure of a DC-DC converter provided in an embodiment of the present invention is shown; Figure 2 One of the structural schematic diagrams of the ripple compensation device provided in the embodiment of the present invention is shown; Figure 3 A schematic diagram of the current generation module provided in an embodiment of the present invention is shown; Figure 4 A second schematic diagram of the ripple compensation device provided in an embodiment of the present invention is shown; Figure 5 The third schematic diagram of the ripple compensation device provided in the embodiment of the present invention is shown; Figure 6 The fourth schematic diagram of the ripple compensation device provided in the embodiment of the present invention is shown. Figure 7 The fifth schematic diagram of the ripple compensation device provided in the embodiment of the present invention is shown; Figure 8 A circuit diagram of the ripple compensation device provided in an embodiment of the present invention is shown; Figure 9 The timing diagram of the ripple compensation device provided in the embodiment of the present invention is shown.

[0020] Icons: 10 - DC-DC converter; 101 - Driver module; 102 - Power circuit; 103 - Output filter circuit; 104 - Logic control structure; 20 - Ripple compensation device; 201 - Current generation module; 202 - Ripple superposition module; 203 - Ripple compensation circuit; 204 - Square current generation circuit; 205 - Voltage divider module; 301 - Voltage-controlled current source; 301A - Target voltage-controlled current source; 301B - First voltage-controlled current source; R1 - First resistor; R2 - Second resistor; R3 - Third resistor; EA - Error amplifier; DR - Driver chip; Q1 - First switch; Q2 - Second switch; L0 - Output inductor; C1 - Output capacitor; ESR - Equivalent resistance; OTA1 - First transconductance amplifier; OTA2 - Second transconductance amplifier. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0022] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0023] It should be noted that relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0024] Please refer to Figure 1 , Figure 1The diagram shows the structure of the DC-DC converter in this embodiment. The DC-DC converter 10 in this embodiment includes a drive module 101 and a ripple compensation device 20. The drive module 101 and the ripple compensation device 20 constitute a DC-DC converter 10 with a COT control structure. The ripple compensation device 20 is connected to the input terminal of the drive module 101.

[0025] In this embodiment, the ripple compensation device 20 can adjust the transresistance of the target voltage-controlled current source 301A in its own structure so that it changes linearly with the output voltage, thereby adaptively compensating for the ripple of the DC-DC converter 10, and at the same time increasing the stability of the control loop in the DC-DC converter 10 under different output voltages.

[0026] The same idea applies as the previous embodiment; please refer to [the previous embodiment]. Figure 2 , Figure 2 The diagram shows the structure of the ripple compensation device in this embodiment. The ripple compensation device 20 includes a current generation module 201 and a ripple superposition module 202. The ripple superposition module 202 includes multiple voltage-controlled current sources 301, the output of each voltage-controlled current source 301 being connected to the input of the drive module 101. The multiple voltage-controlled current sources 301 include at least one target voltage-controlled current source 301A. The current generation module 201 is connected to the input of the target voltage-controlled current source 301A in the ripple superposition module 202.

[0027] In this embodiment, the current generation module 201 is used to obtain the control parameters of the DC-DC converter.

[0028] The control parameters are used to characterize data parameters that can be directly obtained by the ripple compensation device 20, including but not limited to the output voltage Vout and output pulse signal SW of the DC-DC converter 10.

[0029] The current generation module 201 is also used to generate an adjustment current based on the output voltage. The target voltage-controlled current source 301A is used to generate its own transconductance based on the adjustment current to obtain the first transconductance value.

[0030] Among them, the first transconductance value is linearly related to the output voltage.

[0031] The ripple superposition module 202 is used to generate a ripple signal based on the adjusted target voltage-controlled current source and other voltage-controlled current sources besides the target voltage-controlled current source, so as to compensate the output voltage of the DC-DC converter.

[0032] This embodiment sets up a current generation module and a ripple superposition module, so that the current generation module provides adjustment current to the ripple superposition module, making the transimpedance of the target voltage-controlled current source under the ripple superposition module change linearly with the output voltage. This causes the generated ripple signal to change with the output voltage, thereby adaptively compensating for the ripple of the output capacitor in the DC-DC converter. This avoids hard switching of the control loop and increases the control stability of the control loop in the DC-DC converter under different output voltages.

[0033] It should be noted that in this embodiment, the first transconductance value is linearly related to the output voltage.

[0034] In one possible implementation, the target voltage-controlled current source can generate its own transconductance based on the sum of the adjustment current and the first bias current, thus obtaining the first transconductance value.

[0035] In this embodiment, the first bias current I1 is generated by the power supply VCC.

[0036] Correspondingly, in this embodiment, the formula for calculating the first transconductance value satisfies: Gmfb=K2*Vout +gmfb_0; Where Gmfb is the first transconductance value, K2 is a positive integer; Vout is the output voltage; gmfb_0 is the transconductance value related to the target voltage-controlled current source and the first bias current, and its value is a fixed constant.

[0037] Please refer to Figure 3 , Figure 3 The diagram shows the structure of the current generation module 201 in this embodiment. The current generation module 201 includes a ripple compensation circuit 203 and a square current generation circuit 204. The output terminal of the ripple compensation circuit 203 is connected to the input terminal of the square current generation circuit 204; the output terminal of the square current generation circuit 204 is connected to the power supply terminal of the target voltage-controlled current source 301A.

[0038] Among them, the ripple compensation circuit 203 is used to obtain the modulation voltage based on the output voltage.

[0039] The square current generating circuit 204 is used to generate an adjustment current based on the modulation voltage; wherein the adjustment current is linearly related to the square of the output voltage.

[0040] In one possible implementation, the value of the modulation voltage in this embodiment is proportional to the output voltage Vout, that is, the modulation voltage Vout... ， The calculation formula can be expressed as: Vout ， =K3*Vout, where K3 is the third coefficient.

[0041] In this embodiment, the square current generating circuit 204 can modulate the voltage Vout.， Based on the base value, an adjustment current is generated. This adjustment current is linearly related to the square of the output voltage.

[0042] Correspondingly, the formula for calculating the adjustment current Igm can be expressed as: Igm=K1*Vout 2 ; Where Igm is the adjustment current; K1 is the first coefficient; and Vout is the output voltage.

[0043] It should be noted that this embodiment does not limit the specific values ​​of the first coefficient K1, the second coefficient K2, and the third coefficient K3, as long as the current Igm is adjusted proportionally to the output voltage Vout. Their specific values ​​can be set according to user needs. For example, the values ​​of the first coefficient K1 and / or the second coefficient K2 and / or the third coefficient K3 can be positive or negative; they can also be integers or fractions.

[0044] Please refer to Figure 4 , Figure 4 This diagram shows another structural schematic of the ripple compensation device in this embodiment. When the control parameters also include the output pulse signal SW, and the ripple superposition module 202 includes the target voltage-controlled current source 301A and the first voltage-controlled current source 301B, the output terminal of the ripple compensation circuit 203 is also connected to the input terminal of the first voltage-controlled current source 301B to provide a first differential signal pair; the output terminal of the first voltage-controlled current source 301B and the output terminal of the target voltage-controlled current source 301A are connected to the input terminal of the drive module 101.

[0045] Among them, the ripple compensation circuit 203 is also used to generate a first differential signal pair based on the output pulse signal; The first voltage-controlled current source 301B is used to generate its own transconductance based on the second bias current to obtain the second transconductance value; In this embodiment, the second bias current I2 is generated by the power supply VCC.

[0046] The ripple superposition module 202 is also used to generate a ripple signal based on the first transconductance value, the second transconductance value and the first differential signal.

[0047] In this embodiment, the formula for calculating the ripple signal is expressed as follows: Vrip = (vcsp-vcsn) / (Gmfb / Gmcs); In the formula, Vrip is the value of the ripple signal; vcsp is the voltage value of the positive terminal of the first differential signal pair; vcsn is the voltage value of the positive terminal of the first differential signal pair; Gmfb is the first transconductance value; and Gmcs is the second transconductance value.

[0048] It should be noted that in this embodiment, the first differential signal pair is used to characterize the ripple component Vsp, which is in phase with the inductor current in the DC-DC converter, and its complementary voltage signal Vsn. Specifically, the voltage value vcsp at the positive terminal is the value of the ripple component Vsp; and the voltage value vcsn at the negative terminal is the value of the voltage signal Vsn.

[0049] Please refer to Figure 5 , Figure 5 This diagram shows another structural schematic of the ripple compensation device in this embodiment. The ripple compensation device 20 also includes a first resistor R1. The first end of the first resistor R1 is connected to the output end of the first voltage-controlled current source 301B, the output end of the target voltage-controlled current source 301A, and the input end of the drive module 101. The second end of the first resistor R1 is grounded.

[0050] In this embodiment, the voltage-controlled current source includes a transconductance amplifier. Therefore, when multiple voltage-controlled current sources include a first transconductance amplifier and a second transconductance amplifier, please refer to [the relevant documentation]. Figure 5 In this embodiment, the voltage-controlled current source may include a transconductance amplifier, and the multiple voltage-controlled current sources include a first transconductance amplifier OTA1 and a second transconductance amplifier OTA2.

[0051] The power supply terminal of the first transconductance amplifier OTA1 receives the adjustment current Igm and the first bias current I1; the power supply terminal of the second transconductance amplifier OTA2 receives the second bias current I2; the ground terminals of the first transconductance amplifier OTA1 and the second transconductance amplifier OTA2 are connected to the input terminal of the drive module 101. The ground terminal of the first transconductance amplifier OTA1 is the output terminal of the target voltage-controlled current source 301A; the ground terminal of the second transconductance amplifier OTA2 is the output terminal of the first voltage-controlled current source 301B. The ground terminal of the first transconductance amplifier OTA1 is also connected to the first end of the first resistor R1.

[0052] In this embodiment, the differential input terminal of the second transconductance amplifier OTA2 is connected to the output terminal of the current generation module 201 to receive the first differential signal pair. Specifically, the non-inverting terminal of the second transconductance amplifier OTA2 is used to receive the ripple component Vsp, and the inverting terminal of the second transconductance amplifier OTA2 is used to receive the voltage signal Vsn that is complementary to the ripple component Vsp.

[0053] In this embodiment, the differential input terminal of the first transconductance amplifier OTA1 is used to receive a second differential signal pair, which is used to characterize the differential signal pair related to the output voltage.

[0054] In one possible implementation, the second differential signal pair includes a reference voltage Vref and a feedback voltage Vfb. Correspondingly, the non-inverting input of the first transconductance amplifier OTA1 is used to receive the reference voltage Vref, and the inverting input is used to receive the feedback voltage Vfb.

[0055] Please continue to refer to this. Figure 5 The ripple compensation device 20 also includes an error amplifier EA. The inverting input terminal of the error amplifier EA is connected to the first terminal of the first resistor R1, and the non-inverting input terminal of the error amplifier EA is connected to the positive terminal of the power supply. The output terminal of the error amplifier EA is connected to the input terminal of the drive module 101.

[0056] Please Figure 5 Based on, refer to Figure 6 , Figure 6 The diagram shows another structural schematic of the ripple compensation device in this embodiment. The ripple compensation device 20 also includes a voltage divider module 205. The first terminal of the voltage divider module 205 is used to receive the output voltage. The second terminal of the voltage divider module 205 is connected to the first input terminal of the target voltage-controlled current source 301A, which is the inverting terminal of the first transconductance amplifier OTA1. The second input terminal of the target voltage-controlled current source 301A is the non-inverting terminal of the first transconductance amplifier OTA1, and is used to receive the reference voltage Vref. The third terminal of the voltage divider module 205 is grounded.

[0057] In this embodiment, reference Figure 7 , Figure 7 Another structural schematic diagram of the ripple compensation device in this embodiment is provided. The voltage divider module 205 includes two resistors, namely a second resistor R2 and a third resistor R3. The first end of the second resistor R2 is used to receive the output voltage Vout. The second end of the second resistor R2 is connected to the first end of the third resistor R3 and the inverting terminal of the first transconductance amplifier OTA1. The second end of the third resistor R3 is grounded.

[0058] In this embodiment, the voltage divider module 205 divides the output voltage Vout in the DC-DC converter 10 to obtain a feedback voltage Vfb, and sends the feedback voltage Vfb to the inverting input terminal of the target voltage-controlled current source 301A.

[0059] Based on this, in this embodiment, the ripple component Vsp and the voltage signal Vsn can be superimposed by the current generated by the first voltage-controlled current source 301B with a transconductance of Gmcs and the current generated by the feedback voltage Vfb and the reference voltage Vref through the target voltage-controlled current source 301A with a transconductance of Gmfb. The superimposed current is injected into the first resistor R1, thereby generating a voltage on the first resistor R1. This voltage is then synchronously fed back to the error amplifier EA to generate a signal to control the switching transistor in the DC-DC converter 10, thereby adjusting the on / off state of the switching transistor in the DC-DC converter 10.

[0060] It should be noted that this embodiment does not limit the specific structure of the drive module and / or the switching transistor of the DC-DC converter, as long as the ripple of the DC-DC converter can be compensated by the above-mentioned ripple compensation device, and the ripple signal Vrip output by the ripple compensation device changes linearly with the output voltage Vout, thereby avoiding hard switching of the loop.

[0061] refer to Figure 8 , Figure 8 The circuit diagram of the ripple compensation device in this embodiment is shown. The driving module 101 includes a power circuit 102, an output filter circuit 103, and a logic control structure 104. The power circuit 102 includes a driving chip DR, a first switch Q1, and a second switch Q2. The output filter circuit 103 includes an output inductor L0, an output capacitor C1, and an equivalent resistance ESR.

[0062] The input terminal of the driver chip DR is connected to the output terminal of the logic control structure 104; the input terminal of the logic control structure 104 is connected to the output terminal of the error amplifier EA; the output terminal of the driver chip DR is connected to the control terminals of the first switch Q1 and the second switch Q2; the first terminal of the first switch Q1 is used to receive the input voltage Vin, and the second terminal is connected to the first terminal of the second switch Q2, the input terminal of the ripple compensation circuit 203, and the first terminal of the output inductor L0; the second terminal of the second switch Q2 is grounded; the second terminal of the output inductor L0 is connected to the first terminal of the second resistor R2 and the first terminal of the equivalent resistance ESR; the second terminal of the equivalent resistance ESR is connected to the first terminal of the output capacitor C1; and the second terminal of the output capacitor C1 is grounded. For details regarding the specific structure of the ripple compensation device 20, please refer to [reference needed]. Figure 7 The corresponding textual descriptions will not be repeated here.

[0063] Please refer to Figure 9 , Figure 9 The diagram shows the timing of the ripple compensation device in this embodiment. It can be seen that in this embodiment, during the continuous sampling period, the adjustment current Igm generated by the current generation module and the first transconductance value Gmfb of the target voltage-controlled current source increase linearly with the output voltage Vout. Simultaneously, the pulse width of the output pulse signal SW and the modulation voltage Vout... ， The ripple component Vsp of the first differential signal alignment and its corresponding complementary voltage signal Vsn, as well as the feedback voltage Vfb of the second differential signal alignment, all rise synchronously.

[0064] In summary, this invention provides an adjustment current to the ripple superposition module through a current generation module, so that the transimpedance of the target voltage-controlled current source under the ripple superposition module changes linearly with the output voltage. This, in turn, causes the generated ripple signal to change with the output voltage, thereby achieving adaptive compensation of the DC-DC converter, avoiding hard switching of the control loop, and improving the stability of the control loop in the DC-DC converter under different output voltages.

[0065] In the several embodiments provided in this application, it should be understood that the disclosed apparatus and methods can also be implemented in other ways. The apparatus embodiments described above are merely illustrative; for example, the flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of apparatus, methods, and computer program products according to various embodiments of the present invention. In this regard, each block in a flowchart or block diagram may represent a module, segment, or portion of code containing one or more executable instructions for implementing a specified logical function. It should also be noted that in some alternative implementations, the functions marked in the blocks may occur in a different order than those marked in the drawings. For example, two consecutive blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. It should also be noted that each block in a block diagram and / or flowchart, and combinations of blocks in block diagrams and / or flowcharts, can be implemented using a dedicated hardware-based system that performs the specified function or action, or using a combination of dedicated hardware and computer instructions.

[0066] In addition, the functional modules in the various embodiments of the present invention can be integrated together to form an independent part, or each module can exist independently, or two or more modules can be integrated to form an independent part.

[0067] If the aforementioned functions are implemented as software functional modules and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this invention, or the part that contributes to the prior art, or a portion of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0068] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A ripple compensation device applied to a DC-DC converter, the DC-DC converter including a drive module; characterized in that, The ripple compensation device includes: a current generation module and a ripple superposition module, wherein the current generation module is connected to the ripple superposition module; the ripple superposition module includes multiple voltage-controlled current sources, wherein the output terminal of each voltage-controlled current source is connected to the input terminal of the drive module; the multiple voltage-controlled current sources include at least one target voltage-controlled current source; The current generation module is used to acquire the control parameters of the DC-DC converter, the control parameters including the output voltage; The current generating module is also used to generate an adjustment current based on the output voltage; The target voltage-controlled current source is used to generate its own transconductance based on the adjustment current to obtain a first transconductance value; wherein, the first transconductance value is linearly related to the output voltage; The ripple superposition module is used to generate a ripple signal based on the adjusted target voltage-controlled current source and other voltage-controlled current sources besides the target voltage-controlled current source, so as to compensate the output voltage of the DC-DC converter.

2. The ripple compensation device according to claim 1, characterized in that, The current generation module includes a ripple compensation circuit and a square current generation circuit. The output terminal of the ripple compensation circuit is connected to the input terminal of the square current generation circuit. The output terminal of the square current generation circuit is connected to the power supply terminal of the target voltage-controlled current source. The ripple compensation circuit is used to obtain the modulation voltage based on the output voltage. The square current generating circuit is used to generate an adjustment current based on the modulation voltage; wherein the adjustment current is linearly related to the square of the output voltage.

3. The ripple compensation device according to claim 1 or 2, characterized in that, The formula for calculating the adjustment current satisfies: Igm=K1*Vout 2 ; Where Igm is the adjustment current; K1 is the first coefficient; and Vout is the output voltage.

4. The ripple compensation device according to claim 1 or 2, characterized in that, The target voltage-controlled current source is also used to generate its own transconductance based on the sum of the adjustment current and the first bias current to obtain the first transconductance value; the first bias current is generated by the power supply. The formula for calculating the first transconductance value satisfies: Gmfb=K2*Vout +gmfb_0; Wherein, Gmfb is the first transconductance value, K2 is the second coefficient, Vout is the output voltage, and gmfb_0 is the transconductance value related to the target voltage-controlled current source and the first bias current.

5. The ripple compensation device according to claim 2, characterized in that, When the control parameters also include an output pulse signal, and the ripple superposition module includes a target voltage-controlled current source and a first voltage-controlled current source, the output terminal of the ripple compensation circuit is connected to the input terminal of the first voltage-controlled current source; the output terminals of the first voltage-controlled current source and the target voltage-controlled current source are connected to the input terminal of the drive module. The ripple compensation circuit is further configured to generate a first differential signal pair based on the output pulse signal. The first voltage-controlled current source is used to generate its own transconductance based on the second bias current to obtain the second transconductance value; the second bias current is generated by the power supply. The ripple superposition module is further configured to generate the ripple signal based on the first transconductance value, the second transconductance value, and the first differential signal pair.

6. The ripple compensation device according to claim 5, characterized in that, The formula for calculating the ripple signal is as follows: Vrip = (vcsp-vcsn) / (Gmfb / Gmcs); In the formula, Vrip is the value of the ripple signal; vcsp is the voltage value at the positive phase terminal of the first differential signal pair; vcsn is the voltage value at the inverting terminal of the first differential signal; Gmfb is the first transconductance value; Gmcs is the second transconductance value.

7. The ripple compensation device according to claim 5, characterized in that, The ripple compensation device further includes a first resistor, the first end of which is connected to the output terminal of the first voltage-controlled current source, the output terminal of the target voltage-controlled current source, and the input terminal of the drive module; the second end of the first resistor is grounded.

8. The ripple compensation device according to claim 1 or 2, characterized in that, The ripple compensation device further includes a voltage divider module; the first terminal of the voltage divider module is used to receive the output voltage, the second terminal of the voltage divider module is connected to the first input terminal of the target voltage-controlled current source; the second input terminal of the target voltage-controlled current source is used to receive a reference voltage; and the third terminal of the voltage divider module is grounded. The voltage divider module is used to obtain a feedback voltage based on the output voltage, so that the drive module can adjust the on / off state of the switching transistor of the DC-DC converter based on the reference voltage and the feedback voltage.

9. The ripple compensation device according to claim 1 or 2, characterized in that, When the voltage-controlled current source includes a transconductance amplifier, the plurality of voltage-controlled current sources include a first transconductance amplifier and a second transconductance amplifier; the power supply terminal of the first transconductance amplifier is used to receive the adjustment current and the first bias current; the power supply terminal of the second transconductance amplifier is used to receive the second bias current; the ground terminal of the first transconductance amplifier is connected to the ground terminal of the second transconductance amplifier and the input terminal of the driving module; the differential input terminal of the second transconductance amplifier is connected to the output terminal of the current generation module and is used to receive a first differential signal pair; the differential input terminal of the first transconductance amplifier is used to receive a second differential signal pair, and the second differential signal pair is used to characterize the differential signal pair related to the output voltage.

10. The ripple compensation device according to claim 1 or 2, characterized in that, The ripple compensation device further includes an error amplifier, the output of which is connected to the input of the drive module; the first input of the error amplifier is connected to the output of each voltage-controlled current source; and the second input of the error amplifier is connected to the positive terminal of the power supply.

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