Dynamic compensation module, buck converter and power supply equipment
By introducing a dynamic compensation module into the buck converter, the output voltage signal is optimized using dynamic response parameters, and the stability problem that traditional designs are difficult to take into account the full range output conditions, achieving efficient stability and rapid response.
Patent Information
- Application Number
- CN202411982708.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-31
- Publication Date
- 2025-04-18
AI Technical Summary
The compensation design of traditional buck converters is difficult to take into account the stability optimization under the full range of output conditions, resulting in insufficient phase margin at low output voltages and impaired system stability, while the bandwidth is too slow and the response is slow.
A dynamic compensation module is provided. By obtaining the first voltage signal of the input inductor, and using matching dynamic response parameters to perform dynamic response optimization on the second voltage signal output by the output voltage processing module. The input control module performs feedback compensation control, thereby achieving high-performance dynamic response optimization within the full output range.
High-performance dynamic response optimization in the full output range is achieved, so that the phase margin of the output voltage in each range can reach more than 45 degrees, improving the stability and dynamic response performance of the buck converter.
Smart Images
Figure CN119853403A_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the field of circuit technology, and in particular to a dynamic compensation module, a buck converter and a power supply device. Background Art
[0002] In current-mode control of a step-down (buck) converter, the internal compensation components are usually designed for feedback compensation for only a single output voltage condition.
[0003] However, in conventional designs, if the compensation is optimized for low output voltage conditions, the phase margin of the low output voltage can be stabilized to a value higher than 45 degrees, but this will cause the bandwidth to be too slow at high output voltages. In contrast, if the compensation design is optimized for high output voltage conditions, although the bandwidth of the high output voltage can be improved and the phase margin can be controlled at about 45 degrees, the phase margin for low output voltages will be seriously insufficient, resulting in system stability impairment.
[0004] The internal compensation design of the current buck converters on the market is difficult to take into account the stability optimization under the full range of output conditions. Summary of the invention
[0005] In view of this, the present application provides a dynamic compensation module, a buck converter and a power supply device to solve the problem that the traditional buck converter internal compensation design is difficult to take into account the stability optimization under the full range of output conditions.
[0006] The present application provides a dynamic compensation module, which is used to optimize the dynamic response of a buck converter; the buck converter includes an inductor, a first MOS tube and a second MOS tube for controlling the current state of the inductor, a control module for controlling the conduction state of the first MOS tube and the second MOS tube, and an output voltage processing module; the drain of the first MOS tube is connected to the voltage input end, the source is respectively connected to the first end of the inductor and the drain of the second MOS tube, and the gate is respectively connected to the first output end of the control module; the second end of the inductor is respectively connected to the voltage output end and the input end of the output voltage processing module; the source of the second MOS tube is grounded, and the gate is connected to the second output end of the control module; the output end of the output voltage processing module is connected to the input end of the control module;
[0007] The dynamic compensation module includes a first capacitor, a second capacitor and a dynamic filtering network; the first end of the first capacitor is respectively connected to the input end of the control module, the output end of the output voltage processing module and the first end of the dynamic filtering network, and the second end is respectively connected to the first end of the second capacitor and the ground; the second end of the dynamic filtering network is connected to the second end of the second capacitor, and the third end is connected to the first end of the inductor; the dynamic compensation module is used to obtain a first voltage signal input to the inductor, and dynamically optimize the second voltage signal output by the output voltage processing module by using dynamic response parameters matching the first voltage signal, so that the signal after the dynamic response optimization is input to the control module, so that the control module performs feedback compensation control according to the signal after the dynamic response optimization.
[0008] Optionally, the dynamic filtering network includes at least one level of filtering unit and a dynamic resistance unit; each level of the filtering unit includes a resistor and a capacitor; the first end of the resistor of the first level filtering unit is connected to the first end of the inductor, and the second end is connected to the first end of the resistor in the next level filtering unit, and the second end of the second capacitor is connected to the capacitor of the first level filtering unit; the dynamic resistance unit is connected in parallel across the capacitor of the last level filtering unit; the at least one level of filtering unit is used to filter the first voltage signal to obtain a DC signal for characterizing the output voltage; the dynamic resistance unit is used to obtain the DC signal, and provide a resistance value connected to the dynamic filtering network according to the DC signal, so that the dynamic filtering network has dynamic response parameters that match the output voltage.
[0009] Optionally, the dynamic resistance unit includes a processing unit, at least one resistor and switches corresponding to each resistor; the first end of each switch is connected to the output end of the output voltage processing module, the second end is connected to the second end of the second capacitor through the corresponding resistor, and the control end is connected to the output end of the processing unit; the input end of the processing unit is connected to the first end of the inductor, and is used to control the corresponding switch to be turned on according to the DC signal, so that the dynamic resistance unit provides a resistance value corresponding to the output voltage.
[0010] Optionally, in the dynamic resistance unit, at least one resistor includes a first resistor, a second resistor and a third resistor; at least one switch includes a first switch corresponding to the first resistor, a second switch corresponding to the second resistor and a third switch corresponding to the third resistor; the first end of the first switch is connected to the first end of the first capacitor, the second end is connected to the second end of the second capacitor through the first resistor, and the control end is connected to the output end of the processing unit; the first end of the second switch is connected to the first end of the first capacitor, the second end is connected to the second end of the second capacitor through the second resistor, and the control end is connected to the output end of the processing unit; the first end of the third switch is connected to the first end of the first capacitor, the second end is connected to the second end of the second capacitor through the third resistor, and the control end is connected to the output end of the processing unit.
[0011] Optionally, the at least one level filtering unit includes a fourth resistor and a third capacitor; the first end of the fourth resistor is connected to the first end of the inductor, and the second end is connected to the second end of the second capacitor through the third capacitor.
[0012] Optionally, the at least one first-stage filtering unit includes a fifth resistor, a fourth capacitor, a sixth resistor and a fifth capacitor; the first end of the fifth resistor is connected to the first end of the inductor, and the second end is connected to the second end of the second capacitor through the fourth capacitor; the first end of the sixth resistor is connected to the second end of the fifth resistor, and the second end is connected to the second end of the second capacitor through the fifth capacitor.
[0013] The present application also provides a buck converter, which includes an inductor, a first MOS tube and a second MOS tube for controlling the current state of the inductor, a control module for controlling the conduction state of the first MOS tube and the second MOS tube, an output voltage processing module and any one of the above-mentioned dynamic compensation modules.
[0014] Optionally, the control module includes a logic control unit, a first inverting unit and a second inverting unit; the first end of the logic control unit serves as the input end of the control module, and the second end is respectively connected to the first end of the first inverting unit and the first end of the second inverting unit; the second end of the first inverting unit is connected to the gate of the first MOS tube; the second end of the second inverting unit is connected to the gate of the second MOS tube; the logic control unit is used to output a driving signal according to the second voltage signal output by the output voltage processing module; the first inverting unit and the second inverting unit are used to assist each other to turn on one of the first MOS tube and the second MOS tube according to the driving signal, and turn off the other of the first MOS tube and the second MOS tube.
[0015] Optionally, the output voltage processing module includes a seventh resistor, an eighth resistor and an operational amplifier; the first end of the seventh resistor serves as the input end of the output voltage processing module, and the second end is respectively connected to the first end of the eighth resistor and the first input end of the operational amplifier; the second end of the eighth resistor is grounded; the second input end of the operational amplifier is used to access a reference voltage, and the output end serves as the output end of the output voltage processing module.
[0016] The present application also provides a power supply device, which includes any one of the above-mentioned buck converters.
[0017] The dynamic compensation module in the above-mentioned dynamic compensation module, buck converter and power supply device of the present application can obtain a first voltage signal for characterizing the output voltage, and use the dynamic response parameters matching the output voltage to perform dynamic response optimization on the second voltage signal output by the output voltage processing module, so that the signal after dynamic response optimization is input into the control module, and the control module performs feedback compensation control according to the signal after dynamic response optimization; the entire dynamic response optimization process matches the output voltage of the buck converter, so that the dynamic response optimization process can perform high-performance dynamic response optimization on the output voltage in each range, so that the phase margin corresponding to the dynamic response optimization of the output voltage in each range can reach more than 45 degrees, thereby effectively improving the stability and dynamic response performance of the corresponding buck converter. The present application breaks through the limitations of the internal compensation of the traditional buck converter, so that it has efficient stability and fast response in the full output range. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.
[0019] Figure 1 It is a schematic diagram of the buck converter structure during the research process of this application;
[0020] Figure 2 is a schematic diagram of the structure of a buck converter according to an embodiment of the present application;
[0021] Figure 3 is a schematic diagram of a dynamic filtering network structure according to an embodiment of the present application;
[0022] Figure 4 It is a schematic diagram of the dynamic filtering network structure of another embodiment of the present application. DETAILED DESCRIPTION
[0023] The technical solutions in the embodiments of the present application are clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application. In the absence of conflict, the following embodiments and their technical features can be combined with each other.
[0024] The inventors studied the current mode control process of the buck converter to Figure 1 The simplified schematic diagram of the buck converter shown in the figure explains its internal compensation process. Figure 1 In the figure, Vin is the input voltage, Vout is the output voltage, and the internal compensation components include resistor Rcomp, capacitor Ccomp and capacitor Cgm. These internal compensation components can assist each other to optimize for a single output voltage (Vout) condition. However, this fixed compensation method is difficult to meet the stability requirements under different output voltage conditions, resulting in limited performance. When the compensation is adjusted for low output voltage, the phase margin of low output voltage can reach more than 45 degrees, thereby improving stability and dynamic response performance. However, under high output voltage conditions, this design will reduce the bandwidth, resulting in slower system response. Conversely, if the compensation design is based on high output voltage, the bandwidth and phase margin under high output voltage conditions will perform well, but the system stability will be affected due to insufficient phase margin at low output voltage.
[0025] Some manufacturers need to produce more than two versions to meet the needs of different customers, which can easily increase inventory risks and increase production costs.
[0026] In view of the above problems, a first aspect of the present application provides a dynamic compensation module, which is used to optimize the dynamic response of a buck converter.
[0027] refer to Figure 2As shown, the buck converter includes an inductor L1, a first MOS transistor Q1 and a second MOS transistor Q2 for controlling the current state of the inductor L1, a control module 100 for controlling the conduction state of the first MOS transistor Q1 and the second MOS transistor Q2, and an output voltage processing module 200. The drain of the first MOS transistor Q1 is connected to the voltage input terminal for receiving the input voltage Vin, the source of the first MOS transistor Q1 is respectively connected to the first end of the inductor L1 and the drain of the second MOS transistor Q2, and the gate of the first MOS transistor Q1 is connected to the first output terminal of the control module 100; the second end of the inductor L1 is connected to the voltage output terminal to provide the output voltage Vout, and the second end of the inductor L1 is also connected to the input terminal of the output voltage processing module 200; the source of the second MOS transistor Q2 is grounded, and the gate of the second MOS transistor Q2 is connected to the second output terminal of the control module 100; the output terminal of the output voltage processing module 200 is connected to the input terminal of the control module 100.
[0028] Specifically, the dynamic compensation module 300 includes a first capacitor C1, a second capacitor C2 and a dynamic filtering network 310; the first end of the first capacitor C1 is respectively connected to the input end of the control module 100, the output end of the output voltage processing module 200 and the first end of the dynamic filtering network 310, and the second end is respectively connected to the first end of the second capacitor C2 and the ground; the second end of the dynamic filtering network 310 is connected to the second end of the second capacitor C2, and the third end is connected to the first end of the inductor L1; the dynamic compensation module 300 is used to obtain the first voltage signal V1 input to the inductor L1, and dynamically optimize the second voltage signal V2 output by the output voltage processing module 200 by using dynamic response parameters matching the first voltage signal V1, so that the signal after the dynamic response optimization is input to the control module 100, so that the control module 100 performs feedback compensation control according to the signal after the dynamic response optimization. The above-mentioned dynamic response optimization process matches the first voltage signal V1 of the buck converter input inductor L1, thereby matching the output voltage Vout of the buck converter, so that the dynamic response optimization process can perform high-performance dynamic response optimization on the output voltage Vout in each range, so that the phase margin corresponding to the dynamic response optimization of the output voltage Vout in each range can reach more than 45 degrees, thereby effectively improving the stability and dynamic response performance of the corresponding buck converter.
[0029] In some embodiments, the first end of the inductor L1 is marked as LX, the output end of the output voltage processing module 200 is marked as CX1, and the second end of the second capacitor C2 is marked as CX2. The dynamic filter network 310 includes at least one filter unit and a dynamic resistance unit 311; each filter unit 310 includes a resistor and a capacitor; the first end of the resistor of the first filter unit is connected to the first end LX of the inductor L1, and the second end is connected to the first end of the resistor in the next filter unit, and connected to the second end CX2 of the second capacitor C2 through the capacitor of the first filter unit; the dynamic resistance unit 311 is connected in parallel to the two ends of the capacitor of the last filter unit.
[0030] The at least one stage filtering unit is used to filter the first voltage signal V1 to obtain a direct current signal DC for representing the output voltage Vout.
[0031] The dynamic resistance unit 311 is used to obtain the DC signal DC, and provide a resistance value connected to the dynamic filtering network 310 according to the DC signal DC, so that the dynamic filtering network 310 has dynamic response parameters that match the output voltage Vout. At this time, the dynamic filtering network 310 can use the corresponding dynamic response parameters to dynamically optimize the second voltage signal V2 output by the output voltage processing module 200. The dynamic response optimization process can perform high-performance dynamic response optimization on the output voltage Vout in each range, so that the phase margin corresponding to the dynamic response optimization of the output voltage Vout in each range can reach more than 45 degrees, thereby effectively improving the stability and dynamic response performance of the corresponding buck converter.
[0032] The above-mentioned LX terminal is a square wave signal generated when the two switch components, the first MOS tube Q1 and the second MOS tube Q2, are switched alternately. The square wave signal is a first voltage signal V1, which can characterize the state change of the entire buck converter during the switching process and has a periodic characteristic. The first voltage signal V1 is processed by the filter network of at least one filter unit in the dynamic filter network 310, and the first voltage signal V1 in the form of a square wave signal is converted into its average value to generate a relatively stable DC signal DC. The DC signal DC is the output voltage Vout, which can be used to characterize the output voltage of the buck converter. The dynamic resistance unit 311 can provide a resistance value connected to the dynamic filter network 310 according to the DC signal DC, so that the dynamic filter network 310 has a dynamic response parameter that matches the output voltage Vout.
[0033] Specifically, the dynamic resistance unit 311 can pre-store the correspondence between different DC signals DC and the resistance value connected to the dynamic filtering network 310, and determine the resistance value connected to the dynamic filtering network 310 according to the corresponding DC signal DC, so as to obtain optimized resistance parameters under different output voltage Vout conditions, thereby achieving dynamic response optimization of the full range of output voltage.
[0034] In some embodiments, the dynamic resistance unit 311 includes a processing unit (not shown in the figure), at least one resistor and switches corresponding to each resistor. A first end of each switch is connected to the output end CX1 of the output voltage processing module 200, a second end is connected to the second end CX2 of the second capacitor C2 through a corresponding resistor, and a control end (not shown in the figure) is connected to the output end of the processing unit.
[0035] The input end of the processing unit is connected to the first end LX of the inductor to obtain a DC signal DC, so that the processing unit can control the corresponding switch to turn on according to the DC signal, so that the dynamic resistance unit 311 can provide a resistance value corresponding to the output voltage Vout.
[0036] Specifically, the processing unit may include an electrical signal detection component (such as a voltage detector, etc.) and a control component, wherein the electrical signal detection component may detect the magnitude of the DC signal DC at the LX terminal, and control the on and off of each switch according to the DC signal DC. Optionally, the control component may pre-store a plurality of DC signal ranges and switch control modes corresponding to each DC signal range, and upon detecting the magnitude of the DC signal DC at the LX terminal, identify the DC signal range corresponding to the magnitude of the DC signal DC at the LX terminal, and control the on and off of each switch according to the switch control mode corresponding to the DC signal range.
[0037] In some examples, reference Figure 3 and Figure 4As shown, in the dynamic resistance unit 311, at least one resistor includes a first resistor R1, a second resistor R2 and a third resistor R3; at least one switch includes a first switch S1 corresponding to the first resistor R1, a second switch S2 corresponding to the second resistor R2 and a third switch S3 corresponding to the third resistor R3. The first end of the first switch S1 is connected to the first end CX1 of the first capacitor C1, the second end is connected to the second end CX2 of the second capacitor C2 through the first resistor R1, and the control end is connected to the output end of the processing unit; the first end of the second switch S2 is connected to the first end of the first capacitor C1, the second end is connected to the second end CX2 of the second capacitor C2 through the second resistor R2, and the control end is connected to the output end of the processing unit; the first end of the third switch S3 is connected to the first end CX1 of the first capacitor C1, the second end is connected to the second end CX2 of the second capacitor C2 through the third resistor R3, and the control end is connected to the output end of the processing unit. The processing unit can pre-store multiple DC signal ranges and switch control methods corresponding to each DC signal range. When the size of the DC signal DC at the LX end is detected, the DC signal range corresponding to the size of the DC signal DC at the LX end is identified, and each switch is controlled to be on and off according to the switch control method corresponding to the DC signal range.
[0038] The DC signal DC can represent the output voltage Vout. Optionally, the processing unit only turns on one switch at a time; wherein the resistance values of the first resistor R1, the second resistor R2 and the third resistor R3 can be respectively determined by relevant tests and / or determination; for example, the output voltage Vout represented by the DC signal DC is in the first range (such as 2V to 4V), and the resistance provided by the dynamic resistance unit 311 is 30KΩ, the output voltage Vout represented by the DC signal DC is in the second range (such as 2V to 4V), and the resistance provided by the dynamic resistance unit 311 is 30KΩ, the output voltage Vout represented by the DC signal DC is in the second range (such as 4V to 6V), and the resistance provided by the dynamic resistance unit 311 is 41.3KΩ, the output voltage Vout represented by the DC signal DC is in the second range (greater than 6V), and the resistance provided by the dynamic resistance unit 311 is 88KΩ, so that the resistance values corresponding to the first resistor R1, the second resistor R2 and the third resistor R3 and the switch control modes corresponding to each output voltage range can be determined.
[0039] In some examples, reference Figure 3As shown, in the dynamic filtering network 310, at least one level of filtering unit includes a fourth resistor R4 and a third capacitor C3; the first end of the fourth resistor R4 is connected to the first end LX of the inductor L1, and the second end is connected to the second end CX2 of the second capacitor C2 through the third capacitor C3; the dynamic resistance unit 311 is connected in parallel to the two ends of the third capacitor C3. This example can achieve LX end signal filtering through a simple filtering structure, and can simplify the circuit structure as much as possible on the basis of achieving the filtering function.
[0040] In some examples, reference Figure 4 As shown, in the dynamic filtering network 310, at least one level of filtering unit includes a fifth resistor R5, a fourth capacitor C4, a sixth resistor R6 and a fifth capacitor C5. The first end of the fifth resistor R5 is connected to the first end LX1 of the inductor L1, and the second end is connected to the second end CX2 of the second capacitor C2 through the fourth capacitor C4; the first end of the sixth resistor R6 is connected to the second end of the fifth resistor R5, and the second end is connected to the second end CX2 of the second capacitor C2 through the fifth capacitor C5; the dynamic resistance unit 311 is connected in parallel to the two ends of the fifth capacitor C5.
[0041] The fifth resistor R5 and the fourth capacitor C4 are the first-stage filtering unit, the sixth resistor R6 and the fifth capacitor C5 are the second-stage filtering unit. This example uses two-stage filtering units to convert the square wave signal at the LX end into its average value, so that the converted DC signal DC can more accurately represent the output voltage Vout, thereby improving the performance of the dynamic response optimization process.
[0042] In the above dynamic compensation module, the dynamic compensation module 300 can obtain a first voltage signal V1 for characterizing the output voltage Vout, and use dynamic response parameters that match the output voltage Vout to dynamically optimize the second voltage signal V2 output by the output voltage processing module 200, so that the signal after dynamic response optimization is input into the control module 100, so that the control module 100 performs feedback compensation control according to the signal after dynamic response optimization; the entire dynamic response optimization process matches the output voltage Vout of the buck converter, so that the dynamic response optimization process can perform high-performance dynamic response optimization on the output voltage Vout in each range, so that the phase margin corresponding to the dynamic response optimization of the output voltage Vout in each range can reach more than 45 degrees, thereby effectively improving the stability and dynamic response performance of the corresponding buck converter; the dynamic compensation module breaks through the limitations of the internal compensation of the traditional buck converter, so that it has high-efficiency stability and fast response in the entire output range.
[0043] A second aspect of the present application provides a buck converter, referring to Figure 2As shown, the buck converter includes an inductor L1, a first MOS transistor Q1 and a second MOS transistor Q2 for controlling the current state of the inductor L1, a control module 100 for controlling the conduction state of the first MOS transistor Q1 and the second MOS transistor Q2, an output voltage processing module 200 and the dynamic compensation module 300 described in any of the above embodiments.
[0044] The drain of the first MOS transistor Q1 is connected to the voltage input terminal for receiving the input voltage Vin, the source of the first MOS transistor Q1 is respectively connected to the first end of the inductor L1 and the drain of the second MOS transistor Q2, and the gate of the first MOS transistor Q1 is connected to the first output terminal of the control module 100; the second end of the inductor L1 is connected to the voltage output terminal to provide the output voltage Vout, and the second end of the inductor L1 is also connected to the input terminal of the output voltage processing module 200; the source of the second MOS transistor Q2 is grounded, and the gate of the second MOS transistor Q2 is connected to the second output terminal of the control module 100; the output terminal of the output voltage processing module 200 is connected to the input terminal of the control module 100.
[0045] The dynamic compensation module 300 is set at the output end of the output voltage processing module 200, the first capacitor C1, the second capacitor C2 and the dynamic filtering network 310; it is used to access the square wave signal generated when the two switch components of the first MOS tube Q1 and the second MOS tube Q2 are switched alternately. The square wave signal is the first voltage signal V1, which can represent the state change of the entire buck converter during the switching process and has a periodic characteristic. The first voltage signal V1 is processed by the filtering network of at least one filter unit in the dynamic filtering network 310, and the first voltage signal V1 in the form of a square wave signal is converted into its average value, generating a relatively stable DC signal DC, which is the output voltage Vout, and can be used to represent the output voltage of the buck converter. The dynamic resistance unit 311 in the dynamic filter network 310 can provide a resistance value connected to the dynamic filter network 310 according to the DC signal DC, so that the dynamic filter network 310 has a dynamic response parameter that matches the output voltage Vout, so that the first capacitor C1, the second capacitor C2 and the dynamic filter network 310 in the dynamic compensation module 300 can perform dynamic response optimization on the second voltage signal V2 output by the output voltage processing module 200, so that the signal after dynamic response optimization is input into the control module 100. The control module 100 performs feedback compensation control according to the signal after dynamic response optimization. The above-mentioned dynamic response optimization process matches the output voltage Vout of the buck converter, so that the dynamic response optimization process can perform high-performance dynamic response optimization on the output voltage Vout in each range, so that the phase margin corresponding to the dynamic response optimization of the output voltage Vout in each range can reach more than 45 degrees, thereby effectively improving the stability and dynamic response performance of the corresponding buck converter.
[0046] In some embodiments, the control module 100 includes a logic control unit 110, a first inverting unit 120, and a second inverting unit 130. The first end of the logic control unit 110 is used as the input end of the control module 100 and is connected to the output end of the output voltage processing module 200, and the second end of the logic control unit 110 is connected to the first end of the first inverting unit 120 and the first end of the second inverting unit 130 respectively; the second end of the first inverting unit 110 is used as the first output end of the control module 100 and is connected to the gate of the first MOS tube; the second end of the second inverting unit 120 is used as the second output end of the control module 100 and is connected to the gate of the second MOS tube Q2.
[0047] The logic control unit 110 is used to output a driving signal according to the second voltage signal V2 output by the output voltage processing module 200 ; wherein the second voltage signal V2 input to the logic control unit 110 is a signal after dynamic response optimization by the dynamic compensation module 300 .
[0048] The first inverting unit 120 and the second inverting unit 130 are used to assist each other to turn on one of the first MOS transistor Q1 and the second MOS transistor Q2 according to the driving signal, and turn off the other of the first MOS transistor Q1 and the second MOS transistor Q2. Optionally, the first inverting unit 120 and the second inverting unit 130 may respectively include at least one inverter, one of the first inverting unit 120 and the second inverting unit 130 includes an odd number of inverters, and the other includes an even number of inverters, so that after the driving signals are respectively connected, one of the first MOS transistor Q1 and the second MOS transistor Q2 is turned on and the other is turned off.
[0049] In one embodiment, the output voltage processing module 200 includes a seventh resistor R7, an eighth resistor R8 and an operational amplifier EA. The first end of the seventh resistor R7 is used as the input end of the output voltage processing module 200 and is connected to the voltage output end. The second end of the seventh resistor R7 is connected to the first end of the eighth resistor R8 and the first input end of the operational amplifier EA respectively; the second end of the eighth resistor R8 is grounded; the second input end of the operational amplifier EA is used to access the reference voltage REF, and the output end is used as the output end of the output voltage processing module 200 and is used to output the second voltage signal V2, so that the second voltage signal V2 represents the output voltage Vout. In the operational amplifier EA, the first input end is one of the in-phase input end and the inverting input end, and the second input end is the other of the in-phase input end and the inverting input end.
[0050] Alternatively, if Figure 2 As shown, the buck converter may further include components such as an input capacitor Cin and an output capacitor Cout. The input capacitor Cin may be arranged between the voltage input terminal and the ground terminal of the buck converter, and the output capacitor Cout may be arranged between the voltage output terminal and the ground terminal of the buck converter.
[0051] The inventors conducted a dynamic response optimization performance verification analysis on the dynamic compensation module 300 provided by the above embodiments of the present application, and obtained the performance data shown in Table 1 below. In Table 1, Vout represents the output voltage, BW represents the bandwidth, the higher the value, the faster the response, the lower the value, the slower the response, PM represents the phase margin, the higher the value, the more stable the system, the lower the value, the worse the system stability, and the phase margin usually needs to be maintained above 45 degrees to meet the stability requirements of the power supply system, GM represents the gain margin, the higher the value, the more stable the system, the lower the value, the worse the system stability, and the gain margin usually needs to be maintained above 10 degrees to meet the stability requirements of the power supply system. The performance data shown in Table 1 indicate that the dynamic response optimization is performed by the dynamic compensation module 300 provided by the above embodiments, and the output voltage Vout in each range can be dynamically identified and the compensation parameters can be adaptively adjusted, so that the response of the buck converter under each output voltage condition is optimal, and the stability and efficiency of the power supply device where the buck converter is located can be effectively improved.
[0052] Table 1
[0053] Vout(V) BW(KHz) PM(degree) GM(dB) 3.3 50 46 25 5 45 45 29 12 39 46 32
[0054] The buck converter includes the dynamic compensation module 300 described in any of the above embodiments, and has all the beneficial effects of the dynamic compensation module 300 described in any of the above embodiments, which will not be described in detail herein.
[0055] A third aspect of the present application provides a power supply device, which includes at least one buck converter as described in any of the above embodiments.
[0056] The above-mentioned power supply device includes the buck converter described in any of the above-mentioned embodiments, and has all the beneficial effects of the buck converter described in any of the above-mentioned embodiments, which will not be repeated here.
[0057] Although the present application has been shown and described with respect to one or more implementations, equivalent variations and modifications will occur to those skilled in the art based on reading and understanding of this specification and the accompanying drawings. The present application includes all such modifications and variations and is limited only by the scope of the appended claims. In particular, with respect to the various functions performed by the above-mentioned components, the terms used to describe such components are intended to correspond to any component (unless otherwise indicated) that performs the specified function of the component (e.g., it is functionally equivalent), even if it is not structurally equivalent to the disclosed structure that performs the functions in the exemplary implementation of this specification shown herein.
[0058] That is, the above description is only an embodiment of the present application, and does not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the description and drawings of the present application, such as the mutual combination of technical features between the embodiments, or direct or indirect application in other related technical fields, are also included in the patent protection scope of the present application.
[0059] In addition, in the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, which are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, for structural elements with the same or similar characteristics, the present application may use the same or different reference numerals for identification. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.
[0060] In this application, the word "exemplary" is used to mean "used as an example, illustration or description". Any embodiment described as "exemplary" in this application is not necessarily to be construed as being more preferred or more advantageous than other embodiments. In order to enable any technician in the field to implement and use the present application, the present application provides the above description. In the above description, various details are listed for the purpose of explanation. It should be understood that a person of ordinary skill in the art can recognize that the present application can be implemented without using these specific details. In other embodiments, well-known structures and processes will not be elaborated in detail to avoid unnecessary details that make the description of the present application obscure. Therefore, the present application is not intended to be limited to the embodiments shown, but is consistent with the widest range of principles and features disclosed in the present application.
Claims
1. A dynamic compensation module, characterized in that: The dynamic compensation module is used to optimize the dynamic response of the buck converter; the buck converter includes an inductor, a first MOS tube and a second MOS tube for controlling the current state of the inductor, a control module for controlling the conduction state of the first MOS tube and the second MOS tube, and an output voltage processing module; the drain of the first MOS tube is connected to the voltage input end, the source is respectively connected to the first end of the inductor and the drain of the second MOS tube, and the gate is respectively connected to the first output end of the control module; the second end of the inductor is respectively connected to the voltage output end and the input end of the output voltage processing module; the source of the second MOS tube is grounded, and the gate is connected to the second output end of the control module; the output end of the output voltage processing module is connected to the input end of the control module; The dynamic compensation module includes a first capacitor, a second capacitor and a dynamic filtering network; the first end of the first capacitor is respectively connected to the input end of the control module, the output end of the output voltage processing module and the first end of the dynamic filtering network, and the second end is respectively connected to the first end of the second capacitor and the ground; the second end of the dynamic filtering network is connected to the second end of the second capacitor, and the third end is connected to the first end of the inductor; the dynamic compensation module is used to obtain a first voltage signal input to the inductor, and dynamically optimize the second voltage signal output by the output voltage processing module by using dynamic response parameters matching the first voltage signal, so that the signal after the dynamic response optimization is input to the control module, so that the control module performs feedback compensation control according to the signal after the dynamic response optimization.
2. The motion compensation module according to claim 1, characterized in that: The dynamic filtering network includes at least one level of filtering unit and a dynamic resistance unit; each level of the filtering unit includes a resistor and a capacitor; the first end of the resistor of the first level filtering unit is connected to the first end of the inductor, and the second end is connected to the first end of the resistor in the next level filtering unit, and is connected to the second end of the second capacitor through the capacitor of the first level filtering unit; the dynamic resistance unit is connected in parallel to both ends of the capacitor of the last level filtering unit; The at least one level filtering unit is used to filter the first voltage signal to obtain a DC signal for representing the output voltage; The dynamic resistance unit is used to obtain the DC signal and provide a resistance value connected to the dynamic filter network according to the DC signal, so that the dynamic filter network has a dynamic response parameter that matches the output voltage.
3. The motion compensation module according to claim 2, characterized in that: The dynamic resistance unit includes a processing unit, at least one resistor and switches corresponding to each resistor; A first end of each of the switches is connected to the output end of the output voltage processing module, a second end is connected to the second end of the second capacitor via a corresponding resistor, and a control end is connected to the output end of the processing unit; The input end of the processing unit is connected to the first end of the inductor, and is used to control the corresponding switch to be turned on according to the DC signal, so that the dynamic resistance unit provides a resistance value corresponding to the output voltage.
4. The motion compensation module according to claim 3, characterized in that: In the dynamic resistance unit, at least one resistor includes a first resistor, a second resistor and a third resistor; at least one switch includes a first switch corresponding to the first resistor, a second switch corresponding to the second resistor and a third switch corresponding to the third resistor; The first end of the first switch is connected to the first end of the first capacitor, the second end is connected to the second end of the second capacitor through the first resistor, and the control end is connected to the output end of the processing unit; the first end of the second switch is connected to the first end of the first capacitor, the second end is connected to the second end of the second capacitor through the second resistor, and the control end is connected to the output end of the processing unit; the first end of the third switch is connected to the first end of the first capacitor, the second end is connected to the second end of the second capacitor through the third resistor, and the control end is connected to the output end of the processing unit.
5. The motion compensation module according to claim 2, characterized in that: The at least one level filtering unit comprises a fourth resistor and a third capacitor; A first end of the fourth resistor is connected to a first end of the inductor, and a second end of the fourth resistor is connected to a second end of the second capacitor through the third capacitor.
6. The motion compensation module according to claim 2, characterized in that: The at least one level filtering unit comprises a fifth resistor, a fourth capacitor, a sixth resistor and a fifth capacitor; The first end of the fifth resistor is connected to the first end of the inductor, and the second end is connected to the second end of the second capacitor through the fourth capacitor; the first end of the sixth resistor is connected to the second end of the fifth resistor, and the second end is connected to the second end of the second capacitor through the fifth capacitor.
7. A buck converter, characterized in that: The buck converter includes an inductor, a first MOS transistor and a second MOS transistor for controlling the current state of the inductor, a control module for controlling the conduction state of the first MOS transistor and the second MOS transistor, an output voltage processing module and the dynamic compensation module according to any one of claims 1 to 6.
8. The buck converter according to claim 7, characterized in that The control module includes a logic control unit, a first inverting unit and a second inverting unit; The first end of the logic control unit serves as the input end of the control module, and the second end is respectively connected to the first end of the first inverting unit and the first end of the second inverting unit; the second end of the first inverting unit is connected to the gate of the first MOS tube; the second end of the second inverting unit is connected to the gate of the second MOS tube; The logic control unit is used to output a driving signal according to the second voltage signal output by the output voltage processing module; The first inverting unit and the second inverting unit are used to assist each other to turn on one of the first MOS tube and the second MOS tube according to the driving signal, and turn off the other one of the first MOS tube and the second MOS tube.
9. The buck converter according to claim 7, characterized in that: The output voltage processing module includes a seventh resistor, an eighth resistor and an operational amplifier; The first end of the seventh resistor serves as the input end of the output voltage processing module, and the second end is respectively connected to the first end of the eighth resistor and the first input end of the operational amplifier; the second end of the eighth resistor is grounded; the second input end of the operational amplifier is used to access the reference voltage, and the output end serves as the output end of the output voltage processing module.
10. A power supply device, characterized in that: The power supply device comprises at least one buck converter as claimed in any one of claims 7 to 9.