CN115987093B - SC-Buck converter dynamic response control method and device based on capacitance and charge balance - Google Patents

SC-Buck converter dynamic response control method and device based on capacitance and charge balance Download PDF

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CN115987093B
CN115987093B CN202211234669.8A CN202211234669A CN115987093B CN 115987093 B CN115987093 B CN 115987093B CN 202211234669 A CN202211234669 A CN 202211234669A CN 115987093 B CN115987093 B CN 115987093B
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load
voltage
dynamic response
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buck converter
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CN115987093A (en
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王懿杰
荣振帅
管乐诗
张相军
徐殿国
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Harbin Institute of Technology
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Harbin Institute of Technology
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes

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Abstract

SC-Buck converter dynamic response control method and device based on capacitance and charge balance relate to the field of load point power supply dynamic response. In order to solve the problems of complex control and poor stability of the converter in the prior art, the invention provides the technical scheme as follows: comprising the following steps: the acquisition circuit outputs voltage as acquisition data; filtering the acquired data; judging whether the filtered data is or not, if yes, executing the step 4, and if yes, executing the step 5; step 4: setting the driving signal sent to the circuit high, temporarily setting the driving signal low when the turn-off voltage is detected, and recovering the driving signal when the load sudden increase condition disappears; step 5: the drive signal sent into the circuit is set low, the drive signal is temporarily set high when the off voltage is detected, and the drive signal is recovered when the load sudden decrease situation disappears. The method is suitable for improving the dynamic response of the power supply of the load point and meeting the power supply requirements of electric equipment such as a CPU.

Description

SC-Buck converter dynamic response control method and device based on capacitance and charge balance
Technical Field
The dynamic response control method of the SC-Buck converter relates to the field of dynamic response of load point power supplies, in particular to the dynamic response control method of the SC-Buck converter.
Background
With the continuous improvement of chip process and processor performance, in a data center power supply system, the power supply voltage is reduced from 3.3V to 1V or even hundreds of millivolts, and with the increase of the amount of data to be processed, the current required by the processor is increased sharply. In addition to the high-performance processor, the high-performance processor requires a high low-voltage high-current converter, and also requires a high dynamic response, so that the fluctuation amplitude of the output voltage is small enough when the load suddenly changes.
The traditional Buck converter is based on voltage mode control, the frequency is low, the converter is equivalent to a linear system, and a classical control method is adopted for researching the converter. The PI control mode can maintain stable output voltage under the steady state condition, but the response is not fast enough when the load changes dynamically, and the PI control mode has great overshoot and can not meet the requirements of loads such as a high-performance processor and the like.
Multiphase interleaved parallel Buck converters:
with the rapid development of digital signal processors and microprocessors, power supplies thereof are often required to have low-voltage large current and fast dynamic response output characteristics. In order to solve the problems of slow dynamic response, large output current ripple, uneven thermal stress distribution and the like of the switching power supply converter in the application occasion, a multiphase staggered parallel topology structure can be adopted. The staggered driving technology is to connect several identical modules in parallel, and the switching frequencies of the modules are the same, but the adjacent two-phase driving signals have phase angle difference of 2 pi/N, where N represents the parallel phase number of the converters. Fig. 1 shows a schematic diagram of the main power circuit of a multiphase interleaved parallel synchronous Buck converter.
Compared with the traditional single-phase circuit structure, the multi-phase staggered parallel technology enables the total output inductance current ripple of the converter to be smaller than the current ripple of each phase through staggered superposition cancellation. The staggered parallel technology is beneficial to realizing high frequency and miniaturization of the direct current switch converter. Meanwhile, the advantages of the staggered parallel technology can be summarized as follows:
1) And when the switching frequency is the same, the staggered driving control can reduce the output ripple wave, reduce the number and the volume of passive devices in the circuit, and is beneficial to improving the power density of the converter.
2) In the multi-module parallel system, the power born by a single module is only 1/N of the total power, which is beneficial to the uniform distribution of power and heat;
3) The multiphase staggered parallel connection can reduce inductance under the condition of ensuring output ripple, and can provide energy for loads through multiphase paths, so that the dynamic response of the converter is improved.
Although the multiphase interleaved parallel connection greatly improves the current output capability and the dynamic response capability, the voltage reduction ratio of the pure Buck converter is limited, particularly under the condition of higher frequency, and each module is not easy to realize current sharing.
Improved COT control Buck converter:
the CPU is typically powered by a POL (Point Of Load) converter, which is required to follow strict adaptive voltage positioning (Adaptive Voltage Positioning, AVP) requirements to ensure that the CPU is operating in an ideal state. For POL converters, COT (Constant On Time) control is a relatively common variable frequency current mode control, with the COT control mode on-time fixed, and the switching frequency changing as the input and output of the system changes. However, at load transient rise, the COT control mode cannot meet the power supply requirement due to insufficient response speed of the constant on-time characteristic, which may cause the output voltage to undershoot or overshoot. An improved COT control POL converter structure is shown in figure 2, when the load suddenly changes, the single-period response can be realized by controlling the normally-on and normally-off of a switching tube through a state track, and the dynamic response of the converter is improved. However, the control is complex, the parallel connection is difficult, the method is not suitable for a large-current output scene, the closed loop of the analog device is easy to be disturbed, and the stability is poor.
Disclosure of Invention
In order to solve the problems that the control of the converter in the prior art is complex, the converter is not easy to be connected in parallel and is not suitable for a large-current output scene, the closed loop of the simulation device is easy to be interfered, and the stability is poor, the invention provides the technical scheme as follows:
an SC-Buck converter dynamic response control method based on capacitance charge balance, the method comprising:
step 1: the acquisition circuit outputs voltage as acquisition data;
step 2: filtering the acquired data;
step 3: judging whether the filtered data is or not, if yes, executing the step 4, and if yes, executing the step 5;
step 4: setting a drive signal sent into the circuit high, temporarily setting the drive signal low when a turn-off voltage is detected, and recovering the drive signal when the load surge condition disappears;
step 5: setting a drive signal sent into the circuit low, temporarily setting the drive signal high when an off-voltage is detected, and recovering the drive signal when the load-surge condition disappears.
Further, there is provided a preferred embodiment, in the step 3, the method for determining the data is as follows: by threshold detection.
Further, a preferred embodiment is provided, wherein the threshold in the threshold detection is a preset threshold.
Further, there is provided a preferred embodiment, the method for determining the load sudden increase and the load sudden decrease includes: by threshold detection.
Further, a preferred embodiment is provided, wherein the dynamic control method in the circuit employs a state machine concept.
Further, there is provided a preferred embodiment, the method for determining the off-voltage includes:
by the formula:
wherein d represents a theoretical duty cycle,V max represents peak voltage, D represents load abrupt change setting duty cycle, V desire Indicating the desired voltage value.
Based on the same inventive concept, the invention also provides a SC-Buck converter dynamic response control device based on capacitance charge balance, which comprises:
module 1: the circuit is used for collecting output voltage of the circuit as collected data;
module 2: the filtering device is used for filtering the acquired data;
module 3: the method is used for judging whether the filtered data is or not subjected to load abrupt change, if the load abrupt change occurs, executing the function of the module 4, and if the load abrupt change occurs, executing the function of the module 5;
module 4: for setting a drive signal sent into the circuit high, temporarily setting the drive signal low when a turn-off voltage is detected, and recovering the drive signal when the load surge condition disappears;
module 5: for setting the drive signal sent into the circuit low, temporarily setting the drive signal high when an off-voltage is detected, and recovering the drive signal when the load-surge condition disappears.
Based on the same inventive concept, the invention also provides a SC-Buck converter dynamic response control system based on capacitance charge balance, which comprises an SC-Buck circuit, and the system further comprises:
the system comprises an output voltage acquisition assembly, a load change acquisition assembly and a processing unit;
the output voltage acquisition component is used for acquiring output voltage in the circuit;
the load change acquisition component is used for acquiring load voltage in the circuit;
the processing unit is used for executing the SC-Buck converter dynamic response control method based on capacitance and charge balance.
Based on the same inventive concept, the invention also provides a computer storage medium for storing a computer program, when a processor of the computer processes the computer program stored in the storage medium, the computer executes the SC-Buck converter dynamic response control method based on capacitance charge balance.
Based on the same inventive concept, the invention also provides a computer, comprising a processor and a storage medium, wherein when the processor processes a computer program stored in the storage medium, the computer executes the SC-Buck converter dynamic response control method based on capacitance charge balance.
The invention has the advantages that:
the SC-Buck converter dynamic response control method based on capacitance and charge balance is simple in control, is suitable for a large-current output scene, and has higher stability before simulating the anti-interference capability of software.
The SC-Buck converter dynamic response control method based on capacitance charge balance breaks through the limit that the duty ratio of the SC-Buck converter is not more than 0.5, and provides a larger current change rate when the load suddenly changes so as to meet the load dynamic response requirement.
According to the SC-Buck converter dynamic response control method based on capacitance charge balance, a capacitance charge balance control algorithm is applied to the SC-Buck converter for the first time, the current and voltage change conditions of each load abrupt change process are calculated, and the switching voltage during load abrupt change is deduced.
The SC-Buck converter dynamic response control method based on capacitance charge balance provided by the invention has the advantages that the required control information is less, the circuit design is simple, and the optimal dynamic response can be realized by only collecting the output voltage and controlling the switching tube to be accurately turned on and off.
According to the SC-Buck converter dynamic response control method based on capacitance charge balance, an FPGA+high-speed ADC control scheme is adopted, so that the sampling time is greatly shortened, the sampling precision is improved, the control program execution time is shortened, faster dynamic response control is realized, the control idea of a state machine is used, the robustness of a control system is improved, and the control program is simplified.
The SC-Buck converter dynamic response control method based on capacitance and charge balance can be applied to a scene of multi-module parallel output, greatly improves the current output capacity of the converter, and is suitable for a high-power application scene.
The method is suitable for improving the dynamic response of the power supply of the load point and meeting the power supply requirements of electric equipment such as a CPU.
Drawings
FIG. 1 is a schematic diagram of a multi-channel interleaved parallel Buck converter as mentioned in the background;
FIG. 2 is a schematic diagram of an improved COT control Buck converter as mentioned in the background;
FIG. 3 is a schematic diagram of waveforms of a two-phase driving signal and an inductor current according to the first embodiment;
FIG. 4 is a schematic diagram of a charge-discharge balance curve of a capacitor during a load dump according to an embodiment;
FIG. 5 is a flow chart of a method for controlling dynamic response of an SC-Buck converter based on capacitive charge balance according to the first embodiment;
FIG. 6 is a schematic diagram of a dynamic control state machine model according to one embodiment;
FIG. 7 is a schematic diagram of a load dump control signal according to an embodiment;
FIG. 8 is a schematic diagram of a load burst control signal according to an embodiment;
FIG. 9 is a schematic diagram of a 48V-1V test prototype according to the eleventh embodiment;
FIG. 10 is a schematic diagram of waveforms of the switching output voltages 50A-150A according to the eleventh embodiment;
FIG. 11 is a schematic diagram of a waveform of a switching output voltage of 50A-150A according to the eleventh embodiment;
fig. 12 is a waveform diagram showing details of the switching output voltage of 150A-50A according to the eleventh embodiment.
Detailed Description
In order to embody the advantages and benefits of the technical solution provided by the present invention more specifically, the technical solution provided by the present invention will be described in further detail with reference to the accompanying drawings, specifically:
an embodiment one, which is described with reference to fig. 3 to 8, provides a method for controlling dynamic response of an SC-Buck converter based on capacitive charge balance, the method including:
step 1: the acquisition circuit outputs voltage as acquisition data;
step 2: filtering the acquired data;
step 3: judging whether the filtered data is or not, if yes, executing the step 4, and if yes, executing the step 5;
step 4: setting a drive signal sent into the circuit high, temporarily setting the drive signal low when a turn-off voltage is detected, and recovering the drive signal when the load surge condition disappears;
step 5: setting a drive signal sent into the circuit low, temporarily setting the drive signal high when an off-voltage is detected, and recovering the drive signal when the load-surge condition disappears.
Specific:
in order to improve the dynamic response of the converter, the embodiment provides a digital control algorithm based on capacitance and charge balance, breaks through the limitation that the duty ratio of the SC-Buck converter cannot exceed 0.5, and the system analyzes the working principle and the implementation method thereof.
The SC-Buck converter has a higher Buck ratio than conventional Buck converters, and typically, to maintain the intermediate capacitance charge balance, the SC-Buck converter is operated with a duty cycle setting of no more than 0.5, which limits the current rate of change of the converter. In order to improve dynamic response, the design breaks the duty ratio limit when the load suddenly changes, deduces the current change rate under different duty ratios, and finally sets the full duty ratio when the load suddenly changes, namely the driving signal is pulled high; when the load suddenly decreases, the zero duty ratio is set, namely the driving signal is pulled down, so that the current change rate of the converter is greatly improved, and the higher load suddenly-changing requirement can be met. And because of the self-current equalizing characteristic of the SC-Buck converter, the intermediate capacitor can quickly return to a steady state after the load abrupt change adjustment is completed, and the normal operation of the converter is not affected.
When the duty ratio D is more than 0.5, the waveforms of the two-phase driving signal and the inductive current of the SC-Buck converter are shown in FIG. 3;
assuming that the series capacitance is large enough, the voltage of the series capacitance remains unchanged during transient, the average change slope m of the two-phase inductor current in one period 1 、m 2 The method comprises the following steps:
wherein V is IN Is the input voltage, vo is the output voltage, and D is the duty cycle for the load ramp setting.
When the duty ratio d=0, the average change slope m of the two-phase inductor current in one period 1 、m 2 The method comprises the following steps:
wherein V is O Is output voltage, L is the two-phase inductance value of the converter
Based on this, a time-optimal control based on capacitive charge balance is proposed. And the charge and discharge balance of the output capacitor is utilized to reasonably distribute the high and low level time of the driving signal so as to realize the minimum voltage ripple and the shortest adjustment time. Taking the load sudden increase as an example, the whole process is divided into three stages, the off voltage during the load sudden increase can be calculated and obtained by analyzing the charge and discharge process of the capacitor, the on voltage during the load sudden increase can be obtained by the same way, and the optimal dynamic response can be realized by controlling the accurate on and off of the switching tube.
FIG. 4 shows the load current from I o1 Increase to I o2 Sum of inductance currents of time-two-phase series capacitance Buck converter I L Capacitive current I C Output voltage V O Is a change curve of (a). V (V) mid Output minimum voltage, V, representing load surge SW Representing the switching tube off voltage.
Neglecting the influence of output voltage change on the change slope of inductance current, the influence of capacitance ESR on the discharge process of capacitance, line loss and inductance resistance in the load mutation process, the on-resistance of a switching tube can be analyzed to obtain the following three processes:
1、T 0 (t 0 <t<t 1 )
t 0 at the moment, the digital controller detects the sudden increase of the load and then enters an all-pass stage, and the inductance current is gradually increased. In this process, I L <I LO2 The output capacitor discharges and the output voltage decreases. t is t 1 Time of day, I L ＝I LO2 The capacitance voltage reaches the minimum, in the process
I L ＝I L1 +I L2 ＝I O1 +(m 1 +m 2 )(t-t 0 ) (4-6)
I O2 ＝I O1 +(m 1 +m 2 )(t 1 -t 0 ) (4-7)
I C ＝I L -I O2 ＝(m 1 +m 2 )(t-t 1 ) (4-8)
Wherein I is L1 Is the A phase inductance current, I L2 Is B phase inductance current, I L Is the total output current, I O1 Is the load current before the sudden change,
I O2 is the load current after abrupt change, I C Is the current flowing into the output capacitor, V desire Is the expected output voltage value, V min Is the valley voltage, V IN Is the input voltage, vo is the output voltage, and D is the duty cycle of the load ramp set.
2、T 1 (t 1 <t<t 2 )
Wherein V is C Is the output capacitance voltage value, V min Is the valley voltage, V SW Is the off-point voltage.
3、T 2 (t 2 <t<t 3 )
I L1 ＝I O21 +m 3 (t 3 -t) (4-14)
I L2 ＝I O22 +m 3 (t 3 -t) (4-15)
I O21 +I O22 ＝I O2 (4-16)
I C (t)＝I L1 +I L2 -I O2 ＝2m 3 (t 3 -t) (4-17)
From the charge-discharge balance process of the capacitor, (m) 1 +m 2 )T 1 ＝2m 3 T 2 The off-voltage can be calculated:
similarly, the turn-off voltage when the load suddenly decreases can be calculated as:
wherein V is max Is the peak voltage, V SW Is the turn-on voltage.
In an implementation mode, an FPGA is utilized to match with a high-speed ADC with a sampling rate of 100Msps, and algorithm processing is carried out on collected data. The specific implementation block diagram and the driving signal change are shown in fig. 5, the collected data is filtered, and whether the load mutation occurs is judged by a threshold detection method. Taking the example of load dump, when the filtered output voltage data exceeds the set threshold, it is determined that the load dump state is entered while the drive signal is set high (Q 1a 、Q 1b Turn on, Q 2a 、Q 2b Turn-off), the inductor current rises, the output voltage continues to drop due to the inductor current being less than the load current, the output voltage drops to a lowest point when the inductor current is equal to the load current, the voltage valley at this time is recorded and the turn-off voltage value is calculated according to equation (4-22), and the drive signal is temporarily set low (Q) when the turn-off voltage is detected 1a 、Q 1b Turn off, Q 2a 、Q 2b On), because the inductance current is larger than the load current, the output voltage continues to rise, when the output voltage rises to be within the threshold range, the output voltage is switched to PI for regulating to be output stable, when the output voltage returns to the expected value, the fixed duty ratio is set according to the result of PI calculation, and load fluctuation is reduced. The control algorithm is the same as that used in load sudden decrease. The dynamic control adopts the idea of a state machine in the programming process, as shown in fig. 6, so that the robustness of the control program is greatly improved and the implementation is easier.
The waveform of the load burst control signal is shown in fig. 7, and the waveform of the load burst control signal is shown in fig. 8.
In the second embodiment, the present embodiment is further defined on the method for controlling dynamic response of an SC-Buck converter based on capacitive charge balance provided in the first embodiment, in the step 3, the manner of determining the data is as follows: by threshold detection.
In the third embodiment, the method for controlling the dynamic response of the SC-Buck converter based on the capacitance-charge balance provided in the second embodiment is further limited, and the threshold in the threshold detection is a preset threshold.
In a fourth embodiment, the present embodiment is further defined on the method for controlling dynamic response of an SC-Buck converter based on capacitive charge balance provided in the first embodiment, where the method for determining the load dump and the load dump is: by threshold detection.
The fifth embodiment is further defined on the method for controlling the dynamic response of the SC-Buck converter based on the balance of capacitance and charge provided in the first embodiment, where the method for controlling the dynamic response in the circuit uses a state machine concept.
In a sixth embodiment, the present embodiment is further defined on the method for controlling dynamic response of an SC-Buck converter based on capacitive charge balance provided in the first embodiment, where the method for determining the off-voltage is:
by the formula:
wherein d represents a theoretical duty cycle,V max represents peak voltage, D represents load abrupt change setting duty cycle, V desire Indicating the desired voltage value.
An embodiment seven, the present embodiment provides an SC-Buck converter dynamic response control device based on capacitive charge balance, the device including:
module 1: the circuit is used for collecting output voltage of the circuit as collected data;
module 2: the filtering device is used for filtering the acquired data;
module 3: the method is used for judging whether the filtered data is or not subjected to load abrupt change, if the load abrupt change occurs, executing the function of the module 4, and if the load abrupt change occurs, executing the function of the module 5;
module 4: for setting a drive signal sent into the circuit high, temporarily setting the drive signal low when a turn-off voltage is detected, and recovering the drive signal when the load surge condition disappears;
module 5: for setting the drive signal sent into the circuit low, temporarily setting the drive signal high when an off-voltage is detected, and recovering the drive signal when the load-surge condition disappears.
The eighth embodiment provides a capacitive charge balance based SC-Buck converter dynamic response control system, including an SC-Buck circuit, the system further including:
the system comprises an output voltage acquisition assembly, a load change acquisition assembly and a processing unit;
the output voltage acquisition component is used for acquiring output voltage in the circuit;
the load change acquisition component is used for acquiring load voltage in the circuit;
the processing unit is configured to execute the SC-Buck converter dynamic response control method based on capacitive charge balance provided in any one of the first to sixth embodiments.
The ninth embodiment provides a computer storage medium according to the same inventive concept, and the present invention further provides a computer program stored therein, wherein when a processor of the computer processes the computer program stored in the storage medium, the computer executes the SC-Buck converter dynamic response control method based on capacitive charge balance provided in any one of the first to sixth embodiments.
The tenth embodiment provides a computer based on the same inventive concept, and the invention further provides a computer including a processor and a storage medium, wherein when the processor processes a computer program stored in the storage medium, the computer executes the SC-Buck converter dynamic response control method based on capacitive charge balance provided in any one of the first to sixth embodiments.
An eleventh embodiment is described with reference to fig. 9 to 12, where a specific embodiment is provided for the SC-Buck converter dynamic response control method based on capacitive charge balance provided in the first embodiment, and meanwhile, the method is further used to explain the first to sixth embodiments, specifically:
A48-1V, 200W output test prototype is constructed as shown in FIG. 9. The load jumps between 50A-150A at 5ms intervals with a load change rate of 100A/us. The output voltage at sudden load change is recorded as shown in fig. 10-12, and it can be seen that the output voltage drops by only 128mV at sudden load change, and that the output voltage overshoots by only 134mV at sudden load change, while under uncontrolled or conventional control, the output voltage drops and overshoots by more than 300mV at sudden load change. When the voltage detail waveform of the load abrupt change is observed, the control signal is obviously set when the load abrupt change is seen, the control algorithm is well realized, and meanwhile, the correctness of the control theory is verified.

Claims (9)

1. The utility model provides a SC-Buck converter dynamic response control method based on electric capacity charge balance, is directed at two-phase SC-Buck circuit, and two-phase SC-Buck circuit includes:
voltage source and switch tube、/>、/>And->The capacitor Ct, the capacitor Co, the inductor La, the inductor Lb and the load resistor Ro;
the voltage source and the switch tubeThe capacitor Ct, the inductor La and the load resistor Ro are sequentially connected in series;
the anode of the capacitor Co is connected between the inductor La and the load resistor Ro, and the cathode of the capacitor Co is grounded;
the switch tubeIs connected between said capacitance Ct and inductance La, switch tube +.>Is grounded;
the switch tubeAfter being connected in series with the inductor Lb, the capacitor Ct and the threshold values at the two ends of the inductor La are connected in parallel;
the switch tubeIs connected to the drain of the switching tube>And an inductance Lb, synchronous rectifier tube->Is grounded;
characterized in that the method comprises:
step 1: the acquisition circuit outputs voltage as acquisition data;
step 2: filtering the acquired data;
step 3: judging whether the filtered data is or not, if yes, executing the step 4, and if yes, executing the step 5;
step 4: will be sent to the switch tube in the circuitAnd->Is set high, which is temporarily set low when the off-voltage is detectedRecovering the driving signal when the load surge condition disappears;
step 5: will be sent to the switch tube in the circuitAnd->The driving signal of the power supply is set low, the driving signal is temporarily set high when the turn-on voltage is detected, and when the load suddenly-reduced condition disappears, the driving signal is recovered;
the determination mode of the turn-on voltage is as follows:
；
the determination mode of the turn-off voltage is as follows:
；
wherein V is desire Representing the desired output voltage value, V min Is the valley voltage, V max Is the peak voltage, D is the load ramp set duty cycle,representing the theoretical duty cycle.
2. The method for controlling dynamic response of SC-Buck converter according to claim 1, wherein in the step 3, the data is determined by: by threshold detection.
3. The SC-buck converter dynamic response control method based on capacitive charge balancing of claim 2, wherein the threshold in the threshold detection is a preset threshold.
4. The SC-Buck converter dynamic response control method based on capacitive charge balancing of claim 1, wherein the method for determining the load step-up and load step-down is: by threshold detection.
5. The SC-Buck converter dynamic response control method based on capacitive charge balancing of claim 1, wherein the in-circuit dynamic control method uses a state machine concept.
6. The utility model provides a SC-Buck converter dynamic response controlling means based on electric capacity charge balance, is directed at two-phase SC-Buck circuit, two-phase SC-Buck circuit includes:
voltage source and switch tube、/>、/>And->The capacitor Ct, the capacitor Co, the inductor La, the inductor Lb and the load resistor Ro;
the voltage source and the switch tubeThe capacitor Ct, the inductor La and the load resistor Ro are sequentially connected in series;
the anode of the capacitor Co is connected between the inductor La and the load resistor Ro, and the cathode of the capacitor Co is grounded;
the switch tubeIs connected between said capacitance Ct and inductance La, switch tube +.>Is grounded;
the switch tubeAfter being connected in series with the inductor Lb, the capacitor Ct and the threshold values at the two ends of the inductor La are connected in parallel;
the switch tubeIs connected to the drain of the switching tube>And an inductance Lb, synchronous rectifier tube->Is grounded;
characterized in that the device comprises:
module 1: the circuit is used for collecting output voltage of the circuit as collected data;
module 2: the filtering device is used for filtering the acquired data;
module 3: the method is used for judging whether the filtered data is or not subjected to load abrupt change, if the load abrupt change occurs, executing the function of the module 4, and if the load abrupt change occurs, executing the function of the module 5;
module 4: for sending to the switch tube in the circuitAnd->The driving signal of the power supply is set high, the driving signal is temporarily set low when the turn-off voltage is detected, and the driving signal is recovered when the load sudden increase condition disappears;
module 5: for sending to the switch tube in the circuitAnd->The driving signal of the power supply is set low, the driving signal is temporarily set high when the turn-on voltage is detected, and when the load suddenly-reduced condition disappears, the driving signal is recovered;
the determination mode of the turn-on voltage is as follows:
；
the determination mode of the turn-off voltage is as follows:
；
wherein V is desire Representing the desired output voltage value, V min Is the valley voltage, V max Is the peak voltage, D is the load ramp set duty cycle,representing the theoretical duty cycle.
7. SC-Buck converter dynamic response control system based on electric charge balance of electric capacity, including SC-Buck circuit, its characterized in that, the system still includes:
the system comprises an output voltage acquisition assembly, a load change acquisition assembly and a processing unit;
the output voltage acquisition component is used for acquiring output voltage in the circuit;
the load change acquisition component is used for acquiring load voltage in the circuit;
the processing unit is configured to perform the SC-Buck converter dynamic response control method based on capacitive charge balance according to any one of claims 1-5.
8. A computer storage medium storing a computer program, wherein when a processor of a computer processes the computer program stored in the storage medium, the computer performs the SC-Buck converter dynamic response control method according to any one of claims 1 to 5.
9. A computer comprising a processor and a storage medium, wherein the computer performs the capacitive charge balance based SC-Buck converter dynamic response control method of any one of claims 1-5 when the processor processes a computer program stored in the storage medium.
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CN115021565A (en) * 2022-06-13 2022-09-06 广州金升阳科技有限公司 Switched capacitor converter and driving control method thereof

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CN115021565A (en) * 2022-06-13 2022-09-06 广州金升阳科技有限公司 Switched capacitor converter and driving control method thereof

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Comparison of a Buck Converter and a Series Capacitor Buck Converter for High-Frequency, High-Conversion-Ratio Voltage Regulators;Pradeep S. Shenoy等;《IEEE TRANSACTIONS ON POWER ELECTRONICS》;第第31卷卷(第第10期期);第7006-7015页 *

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