DC converter and control method thereof

Abstract

The present application relates to a DC converter and a control method thereof. The DC converter comprises: a conversion circuit module, a feedback sampling circuit module, a ripple detection circuit module, a clock generation module and a control circuit module. The target sampling signal is obtained by sampling the output signal of the DC converter, and ripple detection is performed according to the target sampling signal to generate a modulation signal. Subsequently, a phase plate control signal is output according to the modulation signal and a clock control signal corresponding to the modulation signal, so as to perform DC conversion on the electric energy input signal received by the DC converter according to the phase plate control signal, so that the DC converter can realize different working modes by adjusting the phase relationship of the phase plate control signal, thereby solving the problem of limited efficiency improvement caused by the traditional SC converter being controlled based on the traditional non-overlapping control signal, and significantly improving the efficiency.

Description

Technical Field

[0001] The present application relates to the field of power supply technology, and in particular to a direct current converter and a control method thereof. Background Art

[0002] The power supply plays a vital role in the entire electronic system, providing stable power for the entire system, similar to the human heart. With the rapid development of electronic information technology, people's demands for electronic equipment have increased and their requirements have become higher, prompting power management chips to develop towards higher full-load efficiency, wider load range, lower ripple and diverse working modes, which brings more and more challenges to the design of power management chips.

[0003] DC-DC converters belong to a type of power management chip, which mainly converts a direct current (DC) source from one voltage level to another. Traditional DC-DC circuits are usually divided into two categories: one is a linear regulated power supply, and the other is a switching regulated power supply. According to the different energy storage elements used in the switching regulated power supply, the switching regulated power supply is mainly divided into an inductor switching power supply and a capacitor switching power supply; among them, the inductor switching power supply is usually very efficient, but due to the introduction of the inductor, the circuit will be affected by the electromagnetic interference (EMI) radiation, and the integration is difficult; the switched capacitor (SC) converter is a representative of the capacitor switching power supply, which consists of a switch and a capacitor. Its advantages are that it does not introduce an inductor, so it will not cause EMI radiation, and it is easy to integrate. It has the characteristics of very small output ripple, meets the special requirements of small static current, small area, low weight and low price, and is widely used in medium and low power battery circuits.

[0004] Although the output ripple of the SC converter is very small, during its operation, charge is transferred back and forth between the fast capacitor Cfly and the load capacitor Cload, resulting in charge redistribution loss, which will lead to continuous loss of electric energy and reduce its power efficiency. Moreover, as the operating frequency increases, the energy loss will become more serious, affecting the efficiency of the converter. Summary of the invention

[0005] The present application provides a DC converter and a control method thereof to solve the problem of low efficiency of a traditional SC converter.

[0006] In a first aspect, the present application provides a DC converter, comprising: a conversion circuit module, a feedback sampling circuit module, a ripple detection circuit module, a clock generation module, and a control circuit module;

[0007] The feedback sampling circuit module is used to sample the output signal of the DC converter to obtain a target sampling signal;

[0008] The ripple detection circuit module is used to perform ripple detection according to the system clock signal and the target sampling signal to obtain a modulated signal;

[0009] The clock generating module is used to generate a clock control signal corresponding to the modulation signal;

[0010] The control circuit module is used to output a phase plate control signal to the conversion circuit module according to the modulation signal and the clock control signal;

[0011] The conversion circuit module is used to perform DC conversion on the electric energy input signal received by the DC converter according to the phase plate control signal.

[0012] Optionally, the conversion circuit module includes at least two phase plate circuit sub-modules and a load capacitance sub-module, and the phase plate control signal includes a target control signal corresponding to each of the phase plate circuit sub-modules;

[0013] The control input end of each phase plate circuit submodule is electrically connected to the output end of the control circuit module for receiving the target phase plate control signal; and the power input end of each phase plate circuit submodule serves as the input end of the DC converter for receiving the electric energy input signal; and the output end of each phase plate circuit submodule is electrically connected to the first end of the load capacitor submodule and the sampling input end of the feedback sampling circuit module.

[0014] Optionally, each of the phase plate circuit submodules includes a first switch, a first capacitor and a switch array circuit, and the target phase control signal includes a first switch control signal, a second switch control signal and a second switch selection control signal;

[0015] The control end of the first switch is used to receive the first switch control signal, the first end of the first switch is electrically connected to the power input end of the phase plate circuit submodule, and the second end of the first switch is electrically connected to the first end of the first capacitor and the first end of the switch array circuit;

[0016] The first control end of the switch array circuit is used to receive the second switch control signal, the second control end of the switch array circuit is used to receive the second switch selection control signal, and the second end of the switch array circuit is electrically connected to the first end of the load capacitor submodule and the sampling input end of the feedback sampling circuit module.

[0017] Optionally, the first switch is a first switch tube, the switch array circuit is a switch tube array, and the switch tube array includes at least two switch tubes.

[0018] Optionally, the feedback sampling circuit module includes: a resistor ladder sampling submodule, a capacitor array submodule and a voltage stabilizing capacitor submodule;

[0019] The sampling input end of the resistance ladder sampling submodule is electrically connected to the output end of the conversion circuit module, the voltage output end of the resistance ladder sampling submodule is electrically connected to the detection input end of the ripple detection circuit module and the first end of the voltage stabilizing capacitor submodule, and the second end of the voltage stabilizing capacitor submodule is electrically connected to the reference ground of the DC converter;

[0020] The first end of the capacitor array submodule is electrically connected to the output end of the conversion circuit module, the sampling switch control end of the capacitor array submodule is electrically connected to the sampling switch control end of the resistor ladder sampling submodule and the sampling control output end of the control circuit module, and the second end of the capacitor array submodule is connected to the voltage output end of the resistor ladder sampling submodule;

[0021] The sampling control output terminal of the control circuit module is used to output a sampling switch control signal;

[0022] The resistance ladder sampling submodule is used to perform voltage sampling on the output signal according to the sampling switch control signal to generate the target sampling signal.

[0023] Optionally, the ripple detection circuit module includes a ripple counter submodule and a sampling voltage comparator;

[0024] The ripple counter submodule is used to count ripples according to the voltage comparison signal and the system clock signal output by the clock generation module to obtain a clock quantity signal, and transmit the clock quantity signal as the modulation signal to the control circuit module;

[0025] The sampling voltage comparator is used to output the voltage comparison signal according to the target sampling signal.

[0026] Optionally, the ripple counter submodule includes a ripple counter, the clock input end of the ripple counter is electrically connected to the system clock signal output end of the clock generation module, the detection input end of the ripple counter is electrically connected to the output end of the sampling voltage comparator, and the output end of the ripple counter is electrically connected to the modulation input end of the control circuit module.

[0027] Optionally, the negative input terminal of the sampling voltage comparator is electrically connected to the feedback sampling circuit module, and the positive input terminal of the sampling voltage comparator is used to receive a reference voltage signal, and the voltage comparison signal is an output signal generated by the sampling voltage comparator based on the target sampling signal and the reference voltage signal.

[0028] Optionally, the clock generation module includes a clock generation circuit, a selection signal terminal of the clock generation circuit is electrically connected to a clock control output terminal of the control circuit module, and a clock output terminal of the clock generation circuit is electrically connected to a clock control signal input terminal of the control circuit module;

[0029] The clock control output terminal of the control circuit module is used to output a target selection signal corresponding to the modulation signal;

[0030] The clock generating circuit is used for outputting the clock control signal to the clock control signal input terminal of the control circuit module according to the target selection signal.

[0031] In a second aspect, the present application provides a control method of a DC converter, comprising:

[0032] Sampling the output signal of the DC converter to obtain a target sampling signal;

[0033] Performing ripple detection according to the system clock signal and the target sampling signal to obtain a modulated signal;

[0034] Generating a clock control signal corresponding to the modulation signal;

[0035] Outputting a phase plate control signal according to the modulation signal and the clock control signal;

[0036] According to the phase plate control signal, the power input signal received by the DC converter is converted into DC.

[0037] The embodiment of the present application samples the output signal of the DC converter to obtain a target sampling signal, performs ripple detection based on the target sampling signal, generates a modulation signal, and then outputs a phase plate control signal based on the modulation signal and a clock control signal corresponding to the modulation signal, so as to perform DC conversion on the electric energy input signal received by the DC converter based on the phase plate control signal, so that the DC converter can achieve different operating modes by adjusting the phase relationship of the phase plate control signal, thereby solving the problem of limited efficiency improvement caused by the traditional SC converter being controlled based on traditional non-overlapping control signals, and can significantly improve the efficiency and load range. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0039] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0040] One or more embodiments are exemplarily described by pictures in the corresponding drawings, and these exemplified descriptions do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings represent similar elements, and unless otherwise stated, the figures in the drawings do not constitute proportional limitations.

[0041] Figure 1 is a circuit structure diagram of a traditional SC circuit in the related art;

[0042] Figure 2 A structural block diagram of a DC converter provided in an embodiment of the present application;

[0043] Figure 3 A schematic diagram of the relationship of phase plate control signals in a Multi-Phase structure provided as an example of the present application;

[0044] Figure 4 A schematic diagram of the structure of a DC converter provided as an example of the present application;

[0045] Figure 5 A schematic diagram of the circuit structure of a single Slice provided as an example of this application;

[0046] Figure 6 A schematic diagram of control signals of four working modes provided for an example of the present application;

[0047] Figure 7 A schematic diagram of a circuit structure of a feedback sampling circuit module provided as an example of the present application;

[0048] Figure 8 A schematic diagram of a circuit structure of a ripple counter provided as an example of the present application;

[0049] Fig. 9 A schematic diagram of the principle of a ripple counter measuring ripple provided as an example of the present application;

[0050] Fig.10 A schematic diagram of a circuit structure of a clock generating circuit provided as an example of the present application;

[0051] Fig.11 A schematic diagram of a circuit structure of a 60° phase shift unit provided as an example of the present application;

[0052] Fig.12 A schematic diagram of a circuit structure of a 90° phase shift unit provided as an example of the present application;

[0053] Fig.13 A schematic diagram of a waveform of a clock control signal output by a clock generation circuit provided as an example of the present application;

[0054] Fig.14 A schematic diagram of the phase shift relationship of a clock control signal output by a clock generation circuit provided as an example of the present application;

[0055] Fig.15 A schematic flow chart of the steps of a control method for a DC converter provided in an embodiment of the present application. DETAILED DESCRIPTION

[0056] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are 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 ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0057] The disclosure below provides many different embodiments or examples to implement different structures of the present invention. In order to simplify the disclosure of the present invention, the parts and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present invention. In addition, the present invention can repeat reference numbers and / or letters in different examples. This repetition is for the purpose of simplification and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed.

[0058] In the related art, for a linear voltage regulator, its circuit structure is simple, the number of components required is small, and the circuit area is small. For example, as a linear voltage regulator of a linear voltage regulator, a transistor or a field effect transistor (FET) operating in its linear region is used to generate a regulated output voltage. However, since the transistor is in the linear region, its power consumption is high and its efficiency is low, especially when the input-output voltage difference is large, the above situation will be worse; for a switching voltage regulator, the transistor is mostly switched between the saturation region and the cut-off region, and the accompanying energy loss will be smaller, so high conversion efficiency is a major advantage. For example, a switching voltage regulator, unlike a linear power supply, uses a switching transistor that is mostly switched between a full-on mode (saturation region) and a full-closed mode (cut-off region). Among them, according to the different energy storage elements used, the switching voltage regulator includes two types: capacitor energy storage and inductor energy storage; inductor energy storage is such as common Buck and Boost circuits, and capacitor energy storage is such as charge pump circuits, such as SC converters, which are representatives of capacitor energy storage and are composed of switches and capacitors.

[0059] Although the output ripple of the SC converter is very small, the charge is transferred back and forth between the fast capacitor Cfly and the load capacitor Cload during its operation, resulting in continuous loss of electric energy and reduced power efficiency. For example, in the main structure of the traditional 1:1 SC circuit, Figure 1 As shown, energy loss is mainly caused by two aspects, one is the heat loss caused by the switch on-resistance, and the other is the loss caused by charge transfer; wherein, the first switch control signal Φ1 and the second switch control signal Φ2 are non-overlapping signals, the first switch control signal Φ1 refers to the control signal of the first switch S1, and the second switch control signal Φ2 refers to the control signal of the second switch S2. When the phase of the first switch control signal Φ1 is high and the phase of the second switch control signal Φ2 is low, the first switch S1 is closed and the second switch S2 is open. Assuming that the voltage on the fast capacitor Cfly is stabilized to Vin at this time, and the output voltage across the load capacitor Cload is 0 at this time, then the total energy of the system is now When the first switch control signal Φ1 is low in phase and the second switch control signal Φ2 is high in phase, the first switch S1 is opened and the second switch S2 is closed, and the charge moves from the fast capacitor Cfly to the load capacitor Cload. The final stabilized voltage is The total energy at this time is Then the energy loss of one conversion is When the system is working normally, the large number of conversions leads to serious energy loss caused by charge transfer, and the system efficiency is low. In addition, due to the limitation of the working mode of the SC structure itself, the load range of the system is small. When the system frequency becomes higher, the efficiency of the system becomes lower due to the increase in the number of conversions.

[0060] In order to improve efficiency, many cutting-edge works in related technologies have made improvements to SC converters, but most of them are still based on traditional non-overlapping control signals to control the switches in SC converters. This means that the losses caused by charge transfer cannot be avoided, which limits the efficiency improvement of SC converters. In addition, traditional SC converters also have the problem of weak driving capability.

[0061] In order to solve the problems of low efficiency and small load range of traditional SC converters, the present application provides a DC converter, which obtains a modulation signal through ripple detection to output a phase plate control signal based on the modulation signal, so that the electric energy input signal can be converted into DC according to the phase plate control signal, so that the DC converter can achieve different operating modes by adjusting the phase relationship of the phase plate control signal, thereby significantly improving the efficiency and load range.

[0062] Figure 2 This is a structural block diagram of a DC converter provided in an embodiment of the present application. Figure 2 As shown, the DC converter provided in the embodiment of the present application may specifically include: a conversion circuit module 310 , a feedback sampling circuit module 320 , a ripple detection circuit module 330 , a clock generation module 340 and a control circuit module 350 . The feedback sampling circuit module 320 is used to sample the output signal Vout of the DC converter to obtain a target sampling signal, and then transmit the target sampling signal to the ripple detection circuit module 330, so that the ripple detection circuit module 330 can perform ripple detection according to the system clock signal and the target sampling signal, generate a modulation signal and output it; the ripple detection circuit module 330 is used to perform ripple detection according to the system clock signal and the target sampling signal to obtain a modulation signal; the clock generation module 340 is used to generate a clock control signal corresponding to the modulation signal; the control circuit module 350 is used to output a phase plate control signal to the conversion circuit module 310 according to the modulation signal and the clock control signal, so that the conversion circuit module 310 can perform DC conversion on the power input signal Vin received by the DC converter according to the phase plate control signal, obtain the target signal required to be output by the DC converter, and output it as the output signal Vout. The conversion circuit module 310 is used to perform DC conversion on the power input signal Vin received by the DC converter according to the phase plate control signal.

[0063] It can be seen that the DC converter provided in this embodiment samples the output signal Vout of the DC converter through the feedback sampling circuit module 320 to obtain a target sampling signal, and transmits the target sampling signal to the ripple detection circuit module 330, so that the ripple detection circuit module 330 can perform ripple detection according to the system clock signal and the target sampling signal to generate a modulation signal, and generate a clock control signal corresponding to the modulation signal through the clock generation module, so that the control circuit module 350 can output a phase plate control signal to the conversion circuit module 310 according to the modulation signal and the clock control signal, so as to transmit the phase plate control signal to the conversion circuit module 310, so that the conversion circuit module 310 can perform DC conversion on the electric energy input signal Vin received by the DC converter according to the phase plate control signal, so that the DC converter can realize different working modes by adjusting the phase relationship of the phase plate control signal, thereby solving the problem of limited efficiency improvement caused by the traditional SC converter being controlled based on the traditional non-overlapping control signal, and can significantly improve the efficiency and load range.

[0064] In this embodiment, the conversion circuit module 310 can be used as the main conversion circuit in the DC converter to realize the function of the main conversion circuit and complete the conversion of electric energy from input to output. The phase plate control signal can include target control signals with different phases; the target control signal can refer to a control signal with the same phase, and specifically can include two or more control signals with the same phase, which is not limited in this embodiment.

[0065] In some optional embodiments of the present application, the conversion circuit module 310 may include two or more phase plate circuit sub-modules, and each phase plate sub-module may have a corresponding target control signal, and different target control signals have different phases to form a multi-phase (Multi-Phase) structure, so that the DC converter can be based on the Multi-Phase structure, using overlapping clock signals as control signals, and can achieve different operating modes by adjusting the phase relationship of the control signal, that is, adjusting the phase relationship of the phase plate control signal to achieve different operating modes.

[0066] Specifically, the conversion circuit module 310 in this embodiment may include at least two phase plate circuit sub-modules and a load capacitor sub-module, and the phase plate control signal includes a target control signal corresponding to each of the phase plate circuit sub-modules; the control input end of each of the phase plate circuit sub-modules is electrically connected to the output end of the control circuit module 350 for receiving the target phase plate control signal, so that the conversion circuit module 310 can perform DC conversion on the electric energy input signal Vin received by the DC converter according to the phase plate control signal; and the output end of each of the phase plate circuit sub-modules is electrically connected to the first end of the load capacitor sub-module and the sampling input end of the feedback sampling circuit module 320 for outputting the DC conversion signal. The output signal Vout required to be output by the converter is obtained, so that the feedback sampling circuit module 320 can sample the output signal Vout of the DC converter, and output the target sampling signal to the ripple detection circuit module 330 for ripple detection to realize ripple detection, and the modulation signal generated after the detection can be transmitted to the control circuit module 350 and the clock generation module 340, so that the clock generation module 340 can generate a clock control signal corresponding to the modulation signal, so that the control circuit module 350 can output a phase plate control signal to the conversion circuit module 310 according to the modulation signal and the clock control signal corresponding to the modulation signal, so as to realize ripple control and achieve the purpose of realizing different working modes by adjusting the phase relationship of the phase plate control signal.

[0067] In the embodiment of the present application, all the phase plate circuit submodules in the conversion circuit module 310 can be connected in parallel to the load capacitor submodule, and the power input end of each phase plate circuit submodule can be used as the input end of the DC converter to receive the electric energy input signal Vin, and the control input end of the phase plate circuit submodule is electrically connected to the output end of the control circuit module 350, so that the conversion circuit module 310 can perform DC conversion on the electric energy input signal Vin received by the DC converter according to the phase plate control signal, and can output the converted signal through the output end of the phase plate circuit submodule as the output signal Vout of the DC converter. Among them, the load capacitor submodule can include one or more load capacitors, and this embodiment does not make specific restrictions on this.

[0068] As an example of the present application, when the conversion circuit module 310 includes four phase plate circuit submodules and one load capacitor Cload, the load capacitor Cload can be used as the load capacitor submodule of the conversion circuit module 310, and the control signal phases between each phase differ by 90 degrees, such as Figure 3As shown, the four phase plate circuit submodules included in the conversion circuit module 310 can be used to form a Multi-Phase structure to reduce the ripple of the output voltage, which refers to the voltage of the output signal Vout. It should be noted that Figure 3 The first phase plate control signal Phase1Φ1 refers to the target control signal corresponding to the first phase plate circuit submodule Phase1 in the conversion circuit module 310; the second phase plate control signal Phase2Φ1 refers to the target control signal corresponding to the second phase plate circuit submodule Phase2 in the conversion circuit module 310; the third phase plate control signal Phase3Φ1 refers to the target control signal corresponding to the third phase plate circuit submodule Phase3 in the conversion circuit module 310; the fourth phase plate control signal Phase4Φ1 refers to the target control signal corresponding to the fourth phase plate circuit submodule Phase4 in the conversion circuit module 310.

[0069] In an optional embodiment, each phase plate circuit submodule may specifically include a first switch, a first capacitor and a switch array circuit; the target phase control signal includes a first switch control signal, a second switch control signal and a second switch selection control signal; wherein the first switch control signal may be used to control the first switch, and the second switch control signal may be used to control the second switch in the switch array circuit. Specifically, the control end of the first switch is used to receive the first switch control signal, so that the control circuit module 350 can control the on and off of the first switch through the first switch control signal, the first end of the first switch is electrically connected to the power input end of the phase plate circuit submodule, and the second end of the first switch is electrically connected to the first end of the first capacitor and the first end of the switch array circuit, so that the power input signal Vin can be transmitted to the first end of the first capacitor and the first end of the switch array circuit through the turned-on first switch; wherein the power input end of the phase plate circuit submodule is used to receive the power input signal Vin. The first control end of the switch array circuit is used to receive the second switch control signal, and the second control end of the switch array circuit is used to receive the second switch selection control signal, so that the control circuit module 350 can select and control the conduction of one or more second switches in the switch array circuit through the second switch control signal and the second switch selection control signal, so as to select the second switch with different resistance values ​​to be turned on according to the size of the ripple, so as to achieve the purpose of suppressing the ripple according to the usage conditions or sacrificing a certain amount of ripple in exchange for higher efficiency.

[0070] In some optional embodiments of the present application, each phase slice circuit submodule may include two or more slices (Slices), and the phase of the control signal of the Slices in the same phase slice circuit submodule is the same, so that the efficiency optimization effect can be achieved by adjusting the number of Slices. It should be noted that the circuit structure in each Slice is the same, and may specifically include a first switch, a first capacitor and a switch array circuit, and all Slices and phase slice circuit submodules are connected in parallel to the load capacitor Cload; wherein the switch array circuit may include MOS tubes with different conduction resistance values, and the MOS tube serves as a switch tube in the switch array circuit, so that the control circuit module 350 can select a switch tube with different resistance values ​​through the second switch selection control signal according to the size of the ripple, so as to suppress the ripple according to the use conditions or sacrifice a certain ripple in exchange for higher efficiency.

[0071] Optionally, the first switch in this embodiment is a first switch tube, the switch array circuit is a switch tube array, and the switch tube array includes at least two switch tubes. For example, the switch tube array may include n rows and m columns of second switch tubes, where n is a positive integer greater than one, and m is a positive integer greater than zero.

[0072] For example, when each phase slice circuit submodule includes four slices, Figure 4 As shown, the phase of the control signal of the slices in the same phase slice circuit submodule is the same, and the circuit structure in each slice is the same, including the first switch, the first capacitor and the switch array circuit. Among them, the first capacitor can be used as a fast capacitor Cfly, so that the circuit in a single slice can inherit the structure of the traditional SC in structure, and all the slices and phases in the conversion circuit module 310 are connected in parallel with the load capacitor Cload; the second switch selection control signal Sel can be input from the outside, and its function is to select the second switch tube with different resistance in the switch array circuit according to the size of the ripple, so as to complete the ripple suppression according to the use conditions or sacrifice a certain ripple in exchange for higher efficiency.

[0073] It should be noted that Figure 4 The first Slice 1 in the diagram may refer to the first slice in the phase slice circuit submodule; the second Slice 2 may refer to the second slice in the phase slice circuit submodule; the third Slice 3 may refer to the third slice in the phase slice circuit submodule; and the fourth Slice 4 may refer to the fourth slice in the phase slice circuit submodule.

[0074] The circuit structure of a single Slice can be equivalent to Figure 5The structure shown in the figure inherits the structure of the traditional SC circuit in structure, but different from the non-overlapping control signal of the traditional SC circuit, the control signal used in this example is an overlapping type, such as the overlapping relationship between the first switch control signal Φ1 and the second switch control signal Φ2 can be divided into four working modes of 0°, 60°, 120° and 180°, as shown in FIG. Figure 6 shown.

[0075] Specifically, the modulation principle of the DC converter in this embodiment is as follows:

[0076] When the system works in 180° mode, like the traditional SC converter, it has the characteristics of low efficiency, small ripple and weak load capacity, which is suitable for working under light load and strict ripple requirements.

[0077] When the system operates in 0° mode, since the first switch tube S11 and the second switch tube S21 in the switch array circuit are turned on and off at the same time, the circuit in a single slice of the phase slice circuit submodule can be equivalent to operating in the switched resistor (SR) mode. In SR mode, when the first switch control signal Φ1 and the second switch control signal Φ2 are high at the same time, the load capacitor Cload directly obtains energy from the input end, and since the fast capacitor Cfly and the load capacitor Cload are connected together, there is no loss caused by the charge transfer from the fast capacitor Cfly to the load capacitor Cload in each conversion, so the SR mode is more efficient than the SC mode. Since the output voltage of the DC converter in SR mode can reach up to Vout,max=Vin-IRswitch, the load capacity of the system will be stronger, where Rswitch is the on-resistance of the switch. Considering that the higher the output voltage of the DC converter, the larger the ripple of the output voltage, the DC converter in this embodiment can be based on resistance modulation technology, by selecting a second switch tube S2 with a larger on-resistance to reduce the output ripple. When the system frequency becomes higher, or the on-resistance of the second switch is very large, the charging time of the capacitor in the SR mode becomes shorter, which reduces Vout,max and the output ripple. However, the load capacity is still stronger than that in the SC mode. This shows that the SR mode is suitable for working in situations where the system frequency is higher or the efficiency requirement is high and the ripple requirement is low.

[0078] When the system works in the intermediate phase mode between 0° and 180°, such as 60° and 120° are both phases between 0° and 180°, so the 60° mode and the 120° mode are both intermediate phase modes, and the entire power conversion has both SC mode and SR mode working processes. The ripple, efficiency and load capacity of the working system in the intermediate phase mode will be between the SC mode and the SR mode. The closer to 0°, the higher the efficiency, the larger the ripple, and the larger the load capacity, and the closer to 180°, the lower the efficiency, the smaller the ripple, and the lower the load capacity. The DC converter in this embodiment can be based on resistance modulation technology, by selecting a second switch tube S2 with different on-resistances to achieve controllable ripples. It should be noted that the larger the on-resistance of the connected second switch tube S2, the smaller the final output voltage ripple of the system; the smaller the on-resistance of the connected second switch tube S2, the larger the final output voltage ripple of the system. Therefore, this embodiment can achieve controllable ripples by selecting switch tubes with different on-resistances.

[0079] In this embodiment, the feedback sampling circuit module 320 obtains a target sampling signal by sampling the output signal Vout of the DC converter, and transmits the target sampling signal to the ripple detection circuit module 330, so that the ripple detection circuit module 330 can perform voltage detection and ripple detection according to the target sampling signal, generate a modulation signal, and then implement ripple control based on the modulation signal. For example, when the output signal Vout is an output voltage signal, the feedback sampling circuit module 320 can be used as a feedback voltage sampling circuit in the DC converter to sample the output voltage of the DC converter to sample the output voltage signal and generate a target sampling signal Vfb, such as Figure 4 As shown, the target sampling signal Vfb can be transmitted to the ripple detection circuit module 330, so that the target sampling signal Vfb is sent into the control loop to participate in the closed-loop control, thereby realizing the detection and regulation of the ripple voltage.

[0080] Specifically, the feedback sampling circuit module 320 can generate different output voltages by selecting different resistor voltage division relationships, which are used as the target sampling signal Vfb and sent to the control loop to participate in closed-loop control. Figure 7As shown, the specific structure of the feedback sampling circuit module 320 as a feedback voltage sampling circuit can be composed of two parts: one part is a resistor ladder, which is mainly used to sample the output voltage, and can generate different voltage division relationships through the gating switch to generate different output voltages; the other part is a capacitor array, which is mainly used to form a feedforward path. When the output signal Vout changes very quickly, a fast response can also be obtained at the target sampling signal Vfb. Among them, the resistor ladder can specifically include n resistors connected in series, and the n resistors are R1, R2, ... Rn; the capacitor array can specifically include m capacitors connected in parallel, and the m capacitors are Cs1, Cs2, ... Csm. In a specific implementation, the total resistance of the resistors in the feedback sampling circuit module 320 satisfies the condition that the current flowing through is less than 10% of the load current, and the resistance of each resistor in the resistor ladder needs to satisfy the voltage-dividing relationship between the output voltage and the target sampling signal Vfb voltage to achieve different output voltages; Cm needs to satisfy the condition that the zero and pole are equal in value, that is, Cm×Rup=Cc×RdownIRswitch, where Rup refers to the resistance value currently connected in parallel with Cm, and Rdown refers to the resistance value currently connected in parallel with the voltage-stabilizing capacitor Cc.

[0081] In some optional embodiments of the present application, the feedback sampling circuit module 320 may include: a resistance ladder sampling submodule 810 , a capacitor array submodule 820 and a voltage stabilizing capacitor submodule 830 . Specifically, the sampling input end of the resistance ladder sampling submodule 810 is electrically connected to the output end of the conversion circuit module 310, the voltage output end of the resistance ladder sampling submodule 810 is electrically connected to the detection input end of the ripple detection circuit module 330 and the first end of the voltage stabilizing capacitor submodule 830, the second end of the voltage stabilizing capacitor submodule 830 is electrically connected to the reference ground of the DC converter, the first end of the capacitor array submodule 820 is electrically connected to the output end of the conversion circuit module 310, the sampling switch control end of the capacitor array submodule 820 is electrically connected to the sampling switch control end of the resistance ladder sampling submodule 810 and the sampling control output end of the control circuit module 350, the second end of the capacitor array submodule 820 is connected to the voltage output end of the resistance ladder sampling submodule 810, and the sampling control output end of the control circuit module 350 is used to output the sampling switch control signal Sel_out, so that the resistance ladder sampling submodule 810 can perform voltage sampling on the output signal Vout of the DC converter according to the sampling switch control signal Sel_out, as shown in FIG. Figure 7 As shown, a target sampling signal Vfb is generated. The resistor ladder sampling submodule 810 is used to perform voltage sampling on the output signal Vout according to the sampling switch control signal to generate the target sampling signal.

[0082] In some optional embodiments of the present application, the ripple detection circuit module 330 may specifically include a ripple counter submodule 3301 and a sampling voltage comparator Comp. The sampling voltage comparator Comp is used to output a voltage comparison signal Vcomp according to the target sampling signal; the ripple counter submodule 3301 is used to count ripples according to the voltage comparison signal Vcomp and the system clock signal output by the clock generation module 340 to obtain a clock quantity signal, and transmit the clock quantity signal as the modulation signal to the control circuit module 350.

[0083] In this embodiment, the output terminal of the sampling voltage comparator Comp is electrically connected to the detection input terminal of the ripple counter submodule 3301. Figure 5 As shown, the sampling voltage comparator Comp can output the voltage comparison signal Vcomp to the ripple counter submodule 3301, so that the ripple counter submodule 3301 can output the clock quantity signal according to the voltage comparison signal Vcomp and the system clock signal output by the clock generation module 340, as a modulation signal, and transmit it to the modulation input terminal of the control circuit module 350. Among them, the sampling voltage comparator Comp can compare the target sampling signal Vfb with the reference voltage signal Vrcf to generate a voltage comparison signal Vcomp according to the target sampling signal Vfb and the reference voltage signal Vrcf, and output the voltage comparison signal Vcomp to the ripple counter submodule 3301.

[0084] Of course, in addition to being output to the ripple counter sub-module 3301, the voltage comparison signal Vcomp in this embodiment can also be transmitted to other device modules in the DC converter, such as the control circuit module 350. For example, the output end of the sampling voltage comparator Comp can be electrically connected to the control circuit module 350, so that the voltage comparison signal Vcomp output by the sampling voltage comparator Comp can be directly transmitted to the control circuit module 350, so that the voltage comparison signal Vcomp is directly input into the control circuit module 350 for logic control, thereby enabling the sampling voltage comparator Comp to participate in the modulation of the signal, thereby improving the signal modulation efficiency and accuracy.

[0085] Exemplarily, when the target sampling signal Vfb is less than the reference voltage signal Vrcf, the sampling voltage comparator Comp outputs a voltage comparison signal Vcomp, and transmits the voltage comparison signal Vcomp to the ripple counter submodule 3301 and the control circuit module 350, so that the voltage comparison signal Vcomp is directly input into the control circuit module 350 for logic control, triggering the control circuit module 350 to enable the conversion circuit module 310, such as the control circuit module 350 outputs a phase plate control signal to the conversion circuit module 310 based on the voltage comparison signal Vcomp in combination with the clock control signal to enable the conversion circuit module 310, such as the phase control signal can control the switch in the conversion circuit module 310 to be in a closed state, so that the conversion circuit module 310 starts working, and the voltage received by the DC converter is The power input signal Vin can be converted to DC; and when the target sampling signal Vfb is greater than the reference voltage signal Vrcf, the sampling voltage comparator Comp may not output the voltage comparison signal Vcomp. For example, the voltage of the voltage comparison signal Vcomp output by the sampling voltage comparator Comp is zero, that is, Vcomp=0. At this time, the control circuit module 350 can control the switch in the conversion circuit module 310 to be in an off state through the phase control signal, so that the conversion circuit module 310 is in an inoperative state, that is, the DC conversion of the power input signal Vin is stopped, so as to achieve the purpose of reducing losses. For example, in the case of low load, when the control circuit module 350 detects that the voltage of the voltage comparison signal Vcomp is zero, it can control the switch in the conversion circuit module 310 to be in an off state, so as to achieve the purpose of reducing losses.

[0086] In some optional embodiments of the present application, the negative input terminal of the sampling voltage comparator is electrically connected to the feedback sampling circuit module 320, so that the sampling voltage comparator Comp can detect the target sampling signal Vfb, and the positive input terminal of the sampling voltage comparator is used to receive the reference voltage signal Vrcf, so that the sampling voltage comparator Comp can compare the target sampling signal Vfb with the reference voltage signal Vrcf and output the voltage comparison signal Vcomp. The voltage comparison signal Vcomp is the output signal Vout generated by the sampling voltage comparator according to the target sampling signal Vfb and the reference voltage signal Vrcf. The clock generation module 340 is used to generate a clock control signal according to the clock pulse signal CLK and the clock selection signal.

[0087] In some optional embodiments of the present application, the ripple counter submodule 3301 can realize the function of a ripple counter, which can be specifically used to measure the current load capacity, generate a signal to participate in modulation when the load capacity is insufficient, and measure the ripple size, such as by measuring the number of clocks occupied by the voltage comparison signal output by the sampling voltage comparator when the voltage is low, and compare it with the number of clocks in the 180° mode for reference, so as to measure the ripple size at this time. Optionally, the ripple counter submodule 3301 includes a ripple counter, the clock input end of the ripple counter is electrically connected to the system clock signal output end of the clock generation module 340, the detection input end of the ripple counter is electrically connected to the output end of the sampling voltage comparator, and the output end of the ripple counter is electrically connected to the modulation input end of the control circuit module 350, so that the ripple counter submodule 3301 can count the ripples according to the voltage comparison signal Vcomp output by the sampling voltage comparator Comp and the system clock signal output by the clock generation module 340, obtain the clock number signal, and transmit the clock number signal as the modulation signal to the control circuit module 350.

[0088] The clock quantity signal can be used to indicate the number of clocks occupied when the switch in the conversion circuit module 310 is in the off state. In one embodiment of the present application, the clock quantity signal can indicate the number of clocks occupied by the voltage comparison signal output by the sampling voltage comparator when the voltage is at a low level, such as the number of clocks occupied when the level of the voltage comparison signal is zero, that is, the number of clocks occupied when the sampling voltage comparator outputs Vcomp=0, so that the control circuit module 350 measures the ripple size output at this time according to the clock quantity signal.

[0089] As an example of the present application, the ripple counter submodule 3301 is composed of 8 ripple counters, such as Figure 8As shown, the input signals of the ripple counter are the system clock signal Clk_dcdc and the voltage comparison signal Vcomp output by the sampling voltage comparator, and the output signal Vout is the clock number signal count<0:7>. Among them, the system clock signal Clk_dcdc is a clock signal generated by the clock generation module 340, such as a clock signal generated by the clock generation circuit in the clock generation module 340; the input voltage comparison signal Vcomp passes through the NOT gate and the input system clock signal Clk_dcdc through the AND gate, and is input into the first D flip-flop as a clock signal, and the output signal Vout of the first D flip-flop is used as the input signal of the second flip-flop, then the output value of the output clock number signal count<0:7> is binary-coded by the digital logic circuit, which can represent how many cycles the system clock signal Clk_dcdc has passed in the time when Vcomp=0, that is, it reflects the number of clocks occupied when Vcomp=0, which is recorded as number and output as the clock number signal, and the maximum value of the clock number signal can be 256.

[0090] In the specific implementation, the measured number of clocks reflects two aspects of information. One is the relationship between load capacity and load demand, and the other is the ripple size. In terms of load capacity and load demand, when the measured number of clocks number is close to 256, the conversion circuit works for a short time, that is, the load capacity of the converter can fully meet the load demand at this time; when the measured number of clocks number is close to 0, the conversion circuit works for a long time, that is, the conversion circuit is close to full load, and the load capacity is close to the load demand; when the measured number of clocks number is equal to 0, it means that the system load capacity is insufficient and cannot meet the current load demand. For example, when number = 0, that is, the output of the ripple counter count <0:7> = 0000 0000B (binary), phase modulation can be performed through a digital circuit to select a phase closer to 0° to control switches S1 and S2 until mumber is greater than 0, so that the load capacity meets the load demand. In terms of ripple size, if Fig. 9 As shown, the switch in the conversion circuit module 310 is turned on during the t1 time period, and the switch in the conversion circuit module 310 is turned off during the t2 time period, that is, t2 is the time when the main switch circuit is turned off, at which time only the load capacitor Cload and the load discharge to the output signal Vout. When the load capacitor Cload discharge current iload is constant, the larger the t2, the larger the ripple. Then, the size of the ripple can be reflected by measuring the time t2, that is, measuring the number of clocks occupied when Vcomp=0.

[0091] Considering that the above theory is only suitable for ripple measurement under the same load conditions, since the output of the ripple counter also includes load information, the t2 measurement at this time cannot accurately reflect the size of the ripple (Ripple), so this embodiment compares the target sampling signal with the reference voltage signal to compare and confirm with the 180° ripple, and outputs a voltage comparison signal as the input of the ripple counter and the control circuit module 350. Among them, the reference voltage signal is the output signal Vout under the 180° phase working state. Specifically, since the output of the ripple counter includes load information and ripple information, but the load information cannot be directly measured during use, this embodiment uses the working state under the 180° phase as a reference to determine the load current, and then determines the ripple information through a lookup table. Specifically, the method for obtaining the lookup table may include the following steps: when the system operates in the traditional 180° phase working mode, measure the relationship between the load current and number, and measure the ripple voltage through an external oscilloscope; change to other phases, measure the relationship between the load current and number in the phase, and measure the ripple voltage with an external oscilloscope. Through the relationship of equal load current, the relationship between number at 180° and number at other phases can be drawn, thereby excluding the load information in the ripple counter and leaving only the ripple size information.

[0092] In a specific implementation, under the same circuit parameters, the ripple of the 180° phase is the smallest, and the ripple of the 0° phase is the largest. For the middle phase, the closer to the 0° phase, the larger the ripple; and for efficiency and load capacity, the closer to the 0° phase, the higher the efficiency and the stronger the load capacity; and for the middle phase and the 0° phase, there is a trade-off relationship between ripple and efficiency and load capacity. This embodiment generates a modulation signal by measuring the ripple, so that the user of the DC converter can achieve better performance of the circuit according to the use requirements. For example, if the use conditions are very strict on the ripple, the user can use the 180° phase, and select a high-resistance switch through the second switch selection control signal sel to achieve low ripple; if the use conditions are not very strict on the ripple requirements, other phases can be used to tolerate a part of the ripple in exchange for higher efficiency, and the ripple size reflected by the ripple counter is combined with the resistance modulation to modulate the ripple value to within the tolerance. It can be seen that the ripple counter in this embodiment has two functions. One is to detect and adjust the load capacity, so that the DC converter system can automatically complete the load capacity detection and adjustment through phase modulation; the other function is ripple detection, so that the user of the DC converter can flexibly adjust the working mode of the circuit under different usage environments, that is, a certain mode in the phase modulation and a certain switch tube in the resistance modulation can be selected to achieve the best performance under the usage conditions, which solves the problem of the small load range of the existing DC converter.

[0093] In the embodiment of the present application, the clock generation module 340 can realize the function of the clock generation circuit, and can be specifically used to generate the system clock signal Clk_dcdc and the clock control signal with different phase relationships required in the conversion circuit module 310. Optionally, the clock generation module 340 includes a clock generation circuit, the gating signal end of the clock generation circuit is electrically connected to the clock control output end of the control circuit module 350, and the clock output end of the clock generation circuit is electrically connected to the clock control signal input end of the control circuit module 350; the clock control output end of the control circuit module 350 is used to output the target gating signal corresponding to the modulation signal; the clock generation circuit is used to output the clock control signal to the clock control signal input end of the control circuit module 350 according to the target gating signal, so that the control circuit module 350 can output the phase plate control signal to the conversion circuit module 310 with the clock control signal and the modulation signal, so as to realize the detection and regulation of the ripple voltage. The target gating signal may include one or more clock gating signals, such as two clock gating signals, where the two clock gating signals are a clock gating signal S0 and a clock gating signal S1, which is not limited in this embodiment.

[0094] As an example of the present application, the clock generation circuit can be used to generate control signals with different phase relationships required in the conversion circuit module 310, including 90° phase shift signals between phases and 0°, 60°, 120° and 180° signals between switches S1 and S2. Fig.10 As shown in FIG. 1 , the clock generation circuit includes a 60° phase shift unit, a 90° phase shift unit, an inverter, and a four-way selector. The specific circuit structure of the 60° phase shift unit is as follows: Fig.11 As shown, the specific circuit structure of the 90° phase shift unit is as follows Fig.12 As shown, they are all composed of D flip-flops and other logic gates, and their function is to phase shift the input signal and output it. The output signal Vout of the clock generation circuit is the clock control signal Clk11, the clock control signal Clk21, the clock control signal Clk31, the clock control signal Clk41, the clock control signal Clk12, the clock control signal Clk22, the clock control signal Clk32 and the clock control signal Clk42, where the x of the clock control signal Clkxy refers to the control signal that acts on Phasex (x=1,2,3,4), and y refers to the control signal that acts on the switch Sy (y=1,2). In the clock generation circuit, the clock control signal Clk1y, the clock control signal Clk2y, the clock control signal Clk3y and the clock control signal Clk4y satisfy a 90° phase shift relationship, as shown in Fig.13 As shown ( Fig.13 By controlling the clock selection signal S0 and the clock selection signal S1, the control signals of Clkx1 and Clkx2 with phase shifts of 0°, 60°, 120° and 180° can be generated, such as Fig.14 As shown ( Fig.14 The relationship between the clock selection signal and the phase is shown in Table 1.

[0095] S0 S1 Phase 0 0 0 0 1 60 1 0 120 1 1 180

[0096] Table 1

[0097] In addition, the sampling voltage comparator in this embodiment can be clock triggered, such as the classic strong Arm Latch structure, requiring the comparison time to be less than 1 / 2×fclk_dcdc, and the accuracy to be 5mV, where fclk_dcdc is the frequency of the system clock signal Clk_dcdc generated by the clock generation circuit; the control circuit module 350 serves as the logic control circuit of the DC converter, and can adopt the minimum size under the premise of cooperating with the control loop to complete the logic function, and this embodiment does not impose any specific restrictions on this.

[0098] In summary, the DC converter provided in the embodiment of the present application samples the output signal Vout to obtain a target sampling signal, performs voltage detection and ripple detection based on the target sampling signal to generate a modulation signal, and then outputs a phase plate control signal based on the modulation signal and a clock control signal corresponding to the modulation signal, so as to perform DC conversion on the electric energy input signal Vin received by the DC converter based on the phase plate control signal, so that the DC converter can achieve different operating modes by adjusting the phase relationship of the phase plate control signal, thereby solving the problem of limited efficiency improvement caused by the traditional SC converter being controlled based on traditional non-overlapping control signals, improving the conversion efficiency of the DC converter system, and having a large load range.

[0099] like Fig.15 As shown, the embodiment of the present application provides a control method of a DC converter, comprising the following steps:

[0100] Step 1610, sampling the output signal of the DC converter to obtain a target sampling signal;

[0101] Step 1620, performing ripple detection according to the system clock signal and the target sampling signal to obtain a modulated signal;

[0102] Step 1630, generating a clock control signal corresponding to the modulation signal;

[0103] Step 1640, outputting a phase plate control signal according to the modulation signal and the clock control signal;

[0104] Step 1650: Perform DC conversion on the power input signal received by the DC converter according to the phase plate control signal.

[0105] It can be seen that the embodiment of the present application samples the output signal of the DC converter to obtain a target sampling signal, performs ripple detection based on the target sampling signal, generates a modulation signal, and then outputs a phase plate control signal based on the modulation signal and a clock control signal corresponding to the modulation signal, so as to perform DC conversion on the electric energy input signal received by the DC converter based on the phase plate control signal, so that the DC converter can achieve different operating modes by adjusting the phase relationship of the phase plate control signal, and then can operate in the 0° phase mode of completely overlapping signals to obtain higher efficiency and a wider load range, so as to meet the use requirements of the DC converter in different application scenarios, and introduce an intermediate phase, so that the circuit of the DC converter can have both higher efficiency and lower ripple, thereby improving the performance of the DC converter in terms of ripple, efficiency and load capacity.

[0106] An embodiment of the present application provides a DC converter device, including a processor 111 and a memory 113; the memory 113 is used to store computer programs; the processor 111 is used to execute the program stored in the memory 113 to implement the control method of the DC converter provided by any one of the aforementioned method embodiments, including: sampling the output signal of the DC converter to obtain a target sampling signal; performing ripple detection based on a system clock signal and the target sampling signal to obtain a modulation signal; generating a clock control signal corresponding to the modulation signal; outputting a phase plate control signal based on the modulation signal and the clock control signal; and controlling the conversion circuit module to perform DC conversion on the electric energy input signal received by the DC converter based on the phase plate control signal.

[0107] An embodiment of the present application further provides a computer-readable storage medium having a computer program stored thereon. When the computer program is executed by a processor, the steps of the control method for a DC converter provided in any of the aforementioned method embodiments are implemented.

[0108] The device embodiments described above are merely illustrative, wherein the units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0109] Through the description of the above embodiments, it can be clearly understood by those skilled in the art that each embodiment can be implemented by means of software plus a general hardware platform, and of course, it can also be implemented by hardware. Based on such an understanding, the above technical solution is essentially or the part that contributes to the relevant technology can be embodied in the form of a software product, and the computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, a disk, an optical disk, etc., including several instructions to enable a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the DC converter described in each embodiment or some parts of the embodiment. It should be understood that the terms used in the text are only for the purpose of describing specific example embodiments, and are not intended to be limited. Unless the context clearly indicates otherwise, the singular forms "one", "an" and "said" used in the text can also be expressed as including plural forms. The terms "include", "include", "contain" and "have" are inclusive, and therefore indicate the existence of the stated features, steps, operations, elements and / or components, but do not exclude the existence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring their performance in the particular order described or illustrated, unless explicitly identified as an order of performance. It should also be understood that additional or alternative steps may be used.

[0110] The foregoing is merely a specific embodiment of the present invention, which enables those skilled in the art to understand or implement the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A DC converter, characterized in that: include: Conversion circuit module, feedback sampling circuit module, ripple detection circuit module, clock generation module and control circuit module; The feedback sampling circuit module is used to sample the output signal of the DC converter to obtain a target sampling signal; The ripple detection circuit module is used to perform ripple detection according to the system clock signal and the target sampling signal to obtain a modulated signal; The clock generating module is used to generate a clock control signal corresponding to the modulation signal; The control circuit module is used to output a phase plate control signal to the conversion circuit module according to the modulation signal and the clock control signal; The conversion circuit module is used to perform DC conversion on the electric energy input signal received by the DC converter according to the phase plate control signal; Wherein, the ripple detection circuit module comprises a ripple counter submodule and a sampling voltage comparator; The ripple counter submodule is used to count ripples according to the voltage comparison signal and the system clock signal output by the clock generation module to obtain a clock quantity signal, and transmit the clock quantity signal as the modulation signal to the control circuit module; The sampling voltage comparator is used to output the voltage comparison signal according to the target sampling signal; The clock generation module comprises a clock generation circuit, a selection signal terminal of the clock generation circuit is electrically connected to a clock control output terminal of the control circuit module, and a clock output terminal of the clock generation circuit is electrically connected to a clock control signal input terminal of the control circuit module; The clock control output terminal of the control circuit module is used to output a target selection signal corresponding to the modulation signal; The clock generating circuit is used for outputting the clock control signal to the clock control signal input terminal of the control circuit module according to the target selection signal.

2. The DC converter according to claim 1, characterized in that: The conversion circuit module includes at least two phase plate circuit sub-modules and a load capacitance sub-module, and the phase plate control signal includes a target control signal corresponding to each of the phase plate circuit sub-modules; The control input end of each phase plate circuit submodule is electrically connected to the output end of the control circuit module for receiving the target control signal; and the power input end of each phase plate circuit submodule serves as the input end of the DC converter for receiving the power input signal; Furthermore, the output end of each of the phase plate circuit submodules is electrically connected to the first end of the load capacitance submodule and the sampling input end of the feedback sampling circuit module.

3. The DC converter according to claim 2, characterized in that: Each of the phase plate circuit submodules includes a first switch, a first capacitor and a switch array circuit, and the target control signal includes a first switch control signal, a second switch control signal and a second switch selection control signal; The control end of the first switch is used to receive the first switch control signal, the first end of the first switch is electrically connected to the power input end of the phase plate circuit submodule, and the second end of the first switch is electrically connected to the first end of the first capacitor and the first end of the switch array circuit; The first control end of the switch array circuit is used to receive the second switch control signal, the second control end of the switch array circuit is used to receive the second switch selection control signal, and the second end of the switch array circuit is electrically connected to the first end of the load capacitor submodule and the sampling input end of the feedback sampling circuit module.

4. The DC converter according to claim 3, characterized in that: The first switch is a first switch tube, the switch array circuit is a switch tube array, and the switch tube array includes at least two switch tubes.

5. The DC converter according to claim 1, characterized in that: The feedback sampling circuit module includes: a resistor ladder sampling submodule, a capacitor array submodule and a voltage stabilizing capacitor submodule; The sampling input end of the resistance ladder sampling submodule is electrically connected to the output end of the conversion circuit module, the voltage output end of the resistance ladder sampling submodule is electrically connected to the detection input end of the ripple detection circuit module and the first end of the voltage stabilizing capacitor submodule, and the second end of the voltage stabilizing capacitor submodule is electrically connected to the reference ground of the DC converter; The first end of the capacitor array submodule is electrically connected to the output end of the conversion circuit module, the sampling switch control end of the capacitor array submodule is electrically connected to the sampling switch control end of the resistor ladder sampling submodule and the sampling control output end of the control circuit module, and the second end of the capacitor array submodule is connected to the voltage output end of the resistor ladder sampling submodule; The sampling control output terminal of the control circuit module is used to output a sampling switch control signal; The resistance ladder sampling submodule is used to perform voltage sampling on the output signal according to the sampling switch control signal to generate the target sampling signal.

6. The DC converter according to claim 1, characterized in that: The ripple counter submodule includes a ripple counter, a clock input end of the ripple counter is electrically connected to the system clock signal output end of the clock generation module, a detection input end of the ripple counter is electrically connected to the output end of the sampling voltage comparator, and the output end of the ripple counter is electrically connected to the modulation input end of the control circuit module.

7. The DC converter according to claim 1, characterized in that: The negative input terminal of the sampling voltage comparator is electrically connected to the feedback sampling circuit module, and the positive input terminal of the sampling voltage comparator is used to receive a reference voltage signal. The voltage comparison signal is an output signal generated by the sampling voltage comparator according to the target sampling signal and the reference voltage signal.

8. A control method for a DC converter, characterized in that: Applied to the DC converter according to any one of claims 1 to 7, the method comprises: Sampling the output signal of the DC converter to obtain a target sampling signal; Performing ripple detection according to the system clock signal and the target sampling signal to obtain a modulated signal; Generating a clock control signal corresponding to the modulation signal; Outputting a phase plate control signal according to the modulation signal and the clock control signal; The power input signal received by the DC converter is converted into DC according to the phase plate control signal.

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