Transient response method, circuit and apparatus based on dual-path power converter

Abstract

The application provides a transient response method, circuit and device based on a dual-path power converter, and relates to the technical field of circuit electronics. The transient response method based on the dual-path power converter comprises the following steps: if a voltage mutation signal of a voltage input end in the dual-path power converter is detected, the mutation type of the voltage mutation signal is determined according to the voltage mutation signal; then, the on-off state of a first switching unit, a second switching unit and a third switching unit is controlled according to the mutation type, so that the dual-path power converter enters a mutation working mode; if the voltage difference between two ends of a first flying capacitor in the dual-path power converter and the voltage difference between the voltage input end and a voltage output end satisfy a preset balance condition, the on-off state of the first switching unit, the second switching unit and the third switching unit is controlled, so that the dual-path power converter enters a steady-state working mode.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of circuit electronics, in particular to a transient response method, circuit and device based on a dual-path power converter. BACKGROUND

[0002] In recent years, with the rapid growth of functions and complexity of data centers, electric vehicles and industrial robot systems, traditional power converters are facing design challenges such as low cost, high efficiency and high response speed.

[0003] The existing fast response technology responds to the mutation of the input signal according to the inductance soft charging characteristics of the traditional topology structure, samples the input signal and adjusts the duty cycle of the clock signal, thereby realizing the function of stable output. The control technology suitable for responding to the rapid change of the input power response is still in the state of research and development. SUMMARY

[0004] The present application aims to overcome the shortcomings of the prior art and provide a transient response method, circuit and device based on a dual-path power converter, so as to improve the transient response capability of the power converter and maintain stable output.

[0005] To achieve the above-mentioned purpose, the technical solutions adopted by the embodiments of the present application are as follows:

[0006] In a first aspect, the embodiments of the present application also provide a transient response method based on a dual-path power converter. The method is applied to a control module connected to the control end of a first switching unit, a second switching unit and a third switching unit in a dual-path power converter. The dual-path power converter includes a first flying capacitor, a second flying capacitor, an inductor, a first switching unit, a second switching unit and a third switching unit.

[0007] The upper plate of the first flying capacitor is connected to a voltage input end through the first switching unit, and the upper plate of the first flying capacitor is also connected to a voltage output end through the second switching unit. The lower plate of the first flying capacitor is grounded through the inductor, and the lower plate of the first flying capacitor is also connected to the voltage output end through the third switching unit. The upper plate of the second flying capacitor is connected to the voltage output end, and the lower plate of the second flying capacitor is grounded.

[0008] The method comprises:

[0009] If a voltage mutation signal of the voltage input end in the dual-path power converter is detected, the type of the voltage mutation signal is determined according to the voltage mutation signal.

[0010] controlling on-off states of the first switch unit, the second switch unit and the third switch unit according to the mutation type, so that the dual-path power converter enters a mutation working mode;

[0011] controlling on-off states of the first switch unit, the second switch unit and the third switch unit according to the mutation type, so that the dual-path power converter enters a mutation working mode;

[0012] controlling on-off states of the first switch unit, the second switch unit and the third switch unit according to the mutation type, so that the dual-path power converter enters a mutation working mode;

[0013] if the mutation type is downward mutation and the dual-path power converter is in the first steady-state working mode, controlling the first switch unit and the third switch unit to be turned off and the second switch unit to be turned on, so that the dual-path power converter enters a first downward mutation working mode.

[0014] controlling on-off states of the first switch unit, the second switch unit and the third switch unit according to the mutation type, so that the dual-path power converter enters a mutation working mode, including: if the mutation type is downward mutation and the dual-path power converter is in the second steady-state working mode, controlling the first switch unit and the second switch unit to be turned off and the third switch unit to be turned on, so that the dual-path power converter enters a second downward mutation working mode.

[0015] controlling on-off states of the first switch unit, the second switch unit and the third switch unit according to the mutation type, so that the dual-path power converter enters a mutation working mode;

[0016] if the mutation type is upward mutation and the dual-path power converter is in the first steady-state working mode, controlling the first switch unit and the third switch unit to be turned off and the second switch unit to be turned on, so that the dual-path power converter enters a first upward mutation working mode.

[0017] optionally, the first switch unit in the dual-path power converter includes a main switch unit and an auxiliary switch array connected in parallel with the main switch unit; the control module is connected with a control end of each switch in the auxiliary switch array; and the controlling on-off states of the first switch unit, the second switch unit and the third switch unit according to the mutation type, so that the dual-path power converter enters a mutation working mode, includes:

[0018] if the mutation type is upward mutation and the dual-path power converter is in the second steady-state operation mode, controlling a main switch unit in the first switch unit to be off, a target switch unit in the auxiliary switch array to be on, the second switch unit to be on, and the third switch unit to be off, so that the dual-path power converter enters a second upward mutation operation mode.

[0019] Optionally, the steady-state operation mode includes a first steady-state operation mode and a second steady-state operation mode, and the controlling of the on-off states of the first switch unit, the second switch unit, and the third switch unit so that the dual-path power converter enters the steady-state operation mode includes:

[0020] controlling the first switch unit to be off, the second switch unit to be on, and the third switch unit to be off, so that the dual-path power converter enters the first steady-state operation mode; or controlling the first switch unit to be on, the second switch unit to be off, and the third switch unit to be on, so that the dual-path power converter enters the second steady-state operation mode; or controlling the dual-path power converter to alternately switch between the first steady-state operation mode and the second steady-state operation mode according to a preset period.

[0021] Optionally, before the controlling of the main switch unit in the first switch unit to be off, the target switch unit in the auxiliary switch array to be on, the second switch unit to be on, and the third switch unit to be off, so that the dual-path power converter enters the second upward mutation operation mode, the method further includes:

[0022] determining the target switch unit in the auxiliary switch array according to a dynamic voltage difference of the first flying capacitor and a charging current of the first flying capacitor, wherein the dynamic voltage difference is a voltage difference between the voltage input end voltage and the voltage of the two poles of the first flying capacitor, and a difference between the voltage output end voltage.

[0023] Optionally, before the controlling of the on-off states of the first switch unit, the second switch unit, and the third switch unit according to the mutation type, the method further includes:

[0024] generating an error voltage signal according to an output voltage of a voltage output end of the dual-path power converter and a preset reference voltage;

[0025] generating a reference clock signal according to the error voltage signal and a preset triangular wave signal;

[0026] generating a non-overlapping clock signal according to the reference clock signal;

[0027] The controlling the on-off states of the first switch unit, the second switch unit and the third switch unit according to the mutation type comprises:

[0028] generating a control signal according to the mutation type and the non-overlapping clock signal;

[0029] controlling the on-off states of the first switch unit, the second switch unit and the third switch unit according to the control signal.

[0030] In a second aspect, the embodiments of the present application further provide a transient response control circuit based on a dual-path power converter, the transient response control circuit comprising: a downward mutation detection module, an upward mutation detection module, and a control module; the outputs of the downward mutation detection module and the upward mutation detection module are connected to the input of the control module.

[0031] The control module is configured to execute the steps of the transient response method based on the dual-path power converter according to the voltage mutation signal output by the downward mutation detection module or the upward mutation detection module.

[0032] In a third aspect, the embodiments of the present application further provide a transient response device based on a dual-path power converter, comprising:

[0033] a mutation type determination module configured to determine the mutation type of a voltage mutation signal of a voltage input end of the dual-path power converter if the voltage mutation signal is detected;

[0034] a mutation control module configured to control the on-off states of the first switch unit, the second switch unit and the third switch unit according to the mutation type, so that the dual-path power converter enters a mutation working mode;

[0035] a steady state control module configured to control the on-off states of the first switch unit, the second switch unit and the third switch unit if the voltage difference between the two ends of the first flying capacitor and the voltage difference between the voltage input end and the voltage output end of the dual-path power converter satisfy a preset balance condition, so that the dual-path power converter enters a steady state working mode.

[0036] The beneficial effects of the present application are: the embodiment of the present application provides a transient response method based on a dual-path power converter. If a voltage mutation signal of a voltage input end in the dual-path power converter is detected, the mutation type of the voltage mutation signal is determined according to the voltage mutation signal. Then, according to the mutation type, the on-off state of the first, second and third switching units is controlled, so that the dual-path power converter enters a mutation working mode. If the voltage difference between the two ends of the first flying capacitor and the voltage difference between the voltage input end and the voltage output end in the dual-path power converter satisfy a preset balance condition, the on-off state of the first, second and third switching units is controlled, so that the dual-path power converter enters a steady state working mode.

[0037] Therefore, the transient response method based on the dual-path power converter of the present application can reduce the influence of the first flying capacitor hard charging current under the input voltage mutation signal (even when the voltage fluctuation is large), thereby maintaining a stable output voltage. When processing downward mutation, the dual-path power converter based on the hybrid switched capacitor-inductor topology can change the working mode of the dual-path power converter instantaneously, so that the converter quickly responds to the voltage mutation signal, thereby blocking the influence of the first flying capacitor hard discharge current and ensuring the stability of the output voltage. When processing upward mutation type voltage mutation signal, the adaptive conduction impedance is realized by using the auxiliary switching array, thereby realizing the effect of slowing down the charging speed of the first flying capacitor and reducing the overcharging of the output voltage due to the excessive first flying capacitor hard charging current.

[0038] In summary, the technical scheme of the transient response method based on the dual-path power converter of the present application fully utilizes the charging and discharging characteristics of the first flying capacitor, reduces the influence of the first flying capacitor on the transient characteristics of the dual-path power converter while ensuring the efficiency and current density of the dual-path power converter, and enhances the transient response capability of the dual-path power converter. BRIEF DESCRIPTION OF DRAWINGS

[0039] In order to more clearly illustrate the technical scheme of the embodiments of the present application, the drawings needed in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be considered as limiting the scope. For those skilled in the art, other related drawings can also be obtained without creative labor.

[0040] Figure 1 A schematic diagram of a dual-path power converter is provided for an embodiment of the present application;

[0041] Figure 2A schematic diagram of a dual-path power converter with transient response enhancement technology according to an embodiment of the present application;

[0042] Figure 3 A flow chart of a transient response method based on a dual-path power converter according to an embodiment of the present application;

[0043] Figure 4 A schematic diagram of a first steady-state operation mode of a dual-path power converter according to an embodiment of the present application;

[0044] Figure 5 A schematic diagram of a second steady-state operation mode of a dual-path power converter according to an embodiment of the present application;

[0045] Figure 6 A schematic diagram of a first downward jump operation mode of a dual-path power converter according to an embodiment of the present application;

[0046] Figure 7 A schematic diagram of a second downward jump operation mode of a dual-path power converter according to an embodiment of the present application;

[0047] Figure 8 A schematic diagram of a first upward jump operation mode of a dual-path power converter according to an embodiment of the present application;

[0048] Figure 9 A schematic diagram of a second upward jump operation mode of a dual-path power converter according to an embodiment of the present application;

[0049] Figure 10 A schematic diagram of a principle of selecting an auxiliary switch in an auxiliary switch array according to an embodiment of the present application;

[0050] Figure 11 A flow chart of a transient response method based on a dual-path power converter according to another embodiment of the present application;

[0051] Figure 12 A simulation result of a transient response method based on a dual-path power converter according to an embodiment of the present application;

[0052] Figure 13 A schematic diagram of a transient response circuit based on a dual-path power converter according to an embodiment of the present application;

[0053] Figure 14 A schematic diagram of a transient response device based on a dual-path power converter according to an embodiment of the present application. DETAILED DESCRIPTION

[0054] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some but not all of the embodiments of the present application.

[0055] In the present application, unless specifically defined and limited otherwise, the terms "first", "second" are used only for descriptive purpose and can not be construed as indicating or implying relative importance or implying the number of the indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly contain at least one feature. In the description of the present application, the meaning of "plurality" is at least two, for example, two, three, unless specifically defined otherwise. The term "include", "contain" or any other variant thereof is intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or device. Without more limitation, the element defined by the statement "including a" does not exclude the presence of another identical element in the process, method, article or device including the element.

[0056] In recent years, with the rapid growth of the functions and complexity of data centers, electric vehicles and industrial robot systems, traditional power converters are facing design challenges such as low cost, high efficiency and high response speed. Hybrid switched-capacitor-inductor DC-DC converters are often used to achieve the performance requirements of high power density and high efficiency. However, the control technology suitable for responding to the rapid change of the input power is still in the research and development stage. In order to respond to the mutation of the input signal, the existing fast response technology samples the input signal and adjusts the duty cycle of the clock signal according to the inductance soft charging characteristics of the traditional topology structure, so as to realize the function of stable output. However, for hybrid switched-capacitor-inductor DC-DC converters with hybrid switched-capacitor-inductor topology structure, the inherent flying capacitor hard charging characteristics will result in worse transient characteristics. Therefore, in the face of flying capacitor hard charging, solving the influence of hard charging current is one of the main challenges in the design of this type of converter.

[0057] For example, in the process of USB power supply and 5V bus power supply, due to the influence of instantaneous fluctuation of the power supply signal, the input signal of the power converter will have instantaneous fluctuation, and limited by the bandwidth and speed of the control loop, the instantaneous fluctuation of the input signal will be coupled to the output signal through the converter power stage at the same time, thereby causing the output signal to generate a large DC offset, and the transient response performance of the converter is thus poor. At the same time, for the hybrid switched capacitor-inductor DC-DC converter of the hybrid switched capacitor-inductor topology, in order to realize the shunt effect of the flying capacitor, the hard charging current branch will exist between the input and output of the converter, and due to the uncontrollability of the flying capacitor hard charging current, the transient response performance of the converter will be further limited.

[0058] In view of the existing problems, the embodiments of the present application provide a plurality of possible implementation modes of the transient response method based on the dual-path power converter, so as to improve the transient response capability of the power converter and maintain the stable voltage output. The following is explained and described by means of a plurality of examples in combination with the drawings.

[0059] Firstly, the power converter topology of the present application, i.e. the dual-path power converter, is described:

[0060] Figure 1 A schematic diagram of a dual-path power converter provided by an embodiment of the present application is shown in Figure 1 , which includes a first flying capacitor C F , a second flying capacitor C OUT , an inductor L, a first switching unit S1, a second switching unit S2 and a third switching unit S3.

[0061] The upper plate of the first flying capacitor C F is connected with the voltage input end through the first switching unit S1, and the upper plate of the first flying capacitor C F is also connected with the voltage output end through the second switching unit S2.

[0062] The lower plate of the first flying capacitor C F is grounded through the inductor L, and the lower plate of the first flying capacitor C F is also connected with the voltage output end through the third switching unit S3.

[0063] The upper plate of the second flying capacitor C OUT is connected with the voltage output end, and the lower plate of the second flying capacitor C OUT is grounded.

[0064] Among them, the flying capacitor is a kind of capacitor that can be used as a charge pump, in the present application, the first flying capacitor C F and the second flying capacitor C OUTAs two flying capacitors, the flying capacitors can be of the same or different types, which are not limited in the present application.

[0065] The switch unit is an electronic element capable of realizing the on-off of the circuit, and in the present application, the switch unit can realize the on-off under the control of the control module. For example, the first switch unit S1, the second switch unit S2, and the third switch unit S3 can be power switches, which are not limited in the present application.

[0066] The inductor is an element capable of converting electrical energy into magnetic energy and storing it, and capable of hindering the change of current. The inductor can be, for example, a power inductor, and the type, inductance value, etc. of the inductor L are not limited in the present application, which can be selected by the user according to the actual use scenario.

[0067] Therefore, the embodiment of the present application provides a dual-path power converter, which comprises: a first flying capacitor, a second flying capacitor, an inductor, a first switch unit, a second switch unit, and a third switch unit. The upper plate of the first flying capacitor is connected with the voltage input end through the first switch unit, and the upper plate of the first flying capacitor is also connected with the voltage output end through the second switch unit. The lower plate of the first flying capacitor is grounded through the inductor, and the lower plate of the first flying capacitor is also connected with the voltage output end through the third switch unit. The upper plate of the second flying capacitor is connected with the voltage output end, and the lower plate of the second flying capacitor is grounded. In the circuit, the first switch unit, the second switch unit, and the third switch unit are provided, and by combining the on-off control of the switch units, various different control modes of the dual-path power converter can be realized to adapt to various use scenarios of the power converter, thereby improving the practicability of the dual-path power converter of the present application. In addition, by controlling the dual-path power converter through the following transient response method based on the dual-path power converter, the transient response capability of the power converter can also be improved.

[0068] Optionally, based on the above Figure 1 , the present application further provides a possible implementation manner of a dual-path power converter, Figure 2 , as shown in a schematic diagram of a dual-path power converter with transient response enhancement technology provided by an embodiment of the present application. Figure 2 As shown in the figure, the first switch unit comprises a main switch unit S main , and an auxiliary switch array S aux1 -S auxn parallelly connected with the main switch unit.

[0069] It should be noted that the auxiliary switch array S aux1 -S auxn may comprise n auxiliary switches parallelly connected with the main switch unit. For example, the auxiliary switch array can comprise four auxiliary switches, i.e. S Figure 2 in the figure.aux1 、S aux2 、S aux3 、S aux4 According to different use scenarios, the number of auxiliary switches in the auxiliary switch array can be adjusted. In addition, the auxiliary switches in the auxiliary switch array can be switches with relatively large on-resistance, or a resistor can be connected in series with each auxiliary switch, so as to achieve the effect of a series resistor R Figure 2 between the voltage input end and the upper plate of the first flying capacitor after the closing of the auxiliary switch, and further achieve the shunt adjustment of the circuit current in the dual-path power converter. on

[0070] Next, based on the dual-path power converter described above Figure 1 , the transient response method based on the dual-path power converter of the present application is described. The transient response method based on the dual-path power converter is applied to a control module connected to the control end of the switch unit in the above embodiment to control the on-off of the switch unit. The control module can be a hardware control module or a software control module, which is not limited by the present application. Figure 3 A flowchart of a transient response method based on a dual-path power converter according to an embodiment of the present application is shown in FIG. 3. As shown in FIG. 3, the method comprises the following steps. Figure 3

[0071] Step 301: If a voltage mutation signal of the voltage input end in the dual-path power converter is detected, determine the mutation type of the voltage mutation signal according to the voltage mutation signal.

[0072] If a voltage mutation signal of the voltage input end in the dual-path power converter is detected by the transient response control circuit based on the dual-path power converter, or the voltage mutation signal of the voltage input end in the dual-path power converter is obtained by the transient response device based on the dual-path power converter, then the mutation type of the voltage mutation signal is determined according to the voltage mutation signal.

[0073] Generally, the mutation type of the voltage mutation signal has two types: upward mutation and downward mutation, wherein the upward mutation refers to the case that the voltage of the voltage input end is significantly increased compared with the voltage value at the previous time (or the previous clock unit), and the downward mutation refers to the case that the voltage of the voltage input end is significantly decreased compared with the voltage value at the previous time (or the previous clock unit).

[0074] The above is only an example for illustration, and other mutation types can be extended in actual implementation, which is not limited by the present application.

[0075] ​​Step 302: Control the on / off states of the first, second, and third switching units according to the mutation type, so that the dual-path power converter enters the mutation operation mode.

[0076] Based on the determined mutation type, the on / off states of the first, second, and third switching units are controlled to enable the dual-path power converter to enter the mutation operating mode, thereby maintaining regulated output.

[0077] In one possible implementation, if the mutation type is a downward mutation, the switching unit can be controlled to make the upper plate of the first flying capacitor float in the second downward mutation operating mode, blocking the hard charging current path (i.e., the power path for charging through the flying capacitor) between the input voltage output terminal and the voltage output terminal. This allows the flying capacitor to discharge only through the inductor in the first downward mutation operating mode. Once the flying capacitor discharges to a new steady state, the converter will switch back to steady-state operation, thus eliminating the effect of the input downward mutation.

[0078] In another possible implementation, if the mutation type is an upward mutation, in order to eliminate the overcharging of the output voltage caused by the rapid charging of the flying capacitor by the input signal, the switching unit can be controlled to achieve the current limiting effect of the hard charging current of the flying capacitor (e.g., based on...). Figure 2 The auxiliary switch array enables current limiting, etc., thereby slowing down the hard charging speed of the flying capacitor and thus reducing the impact of the upward sudden change in input.

[0079] The above is merely an example. In actual implementation, there may be other control methods or control ideas for controlling the on / off states of the first switch unit, the second switch unit, and the third switch unit. This application does not limit these methods.

[0080] Step 303: If the dual-path power converter is detected to meet the preset balance condition, the on / off state of the first switching unit, the second switching unit and the third switching unit is controlled so that the dual-path power converter enters the steady-state operating mode.

[0081] After executing step 302, if it is detected that the dual-path power converter meets the preset balance condition, it means that the dual-path power converter has completed the processing of the voltage change signal. Then, by controlling the on / off state of the first switching unit, the second switching unit and the third switching unit, the dual-path power converter enters the steady-state working mode.

[0082] In one possible implementation, the preset balance condition can be, for example, that the difference between the voltage at the input terminal and the voltage at the output terminal is equal to the voltage difference between the upper and lower plates of the first flying capacitor, i.e., V CF =V IN -V OUT , or VCF =V IN-OUT Among them, V CF V is the voltage difference between the upper and lower plates of the first flying capacitor. IN V is the voltage at the voltage input terminal. OUT V is the voltage at the output terminal. IN-OUT This is the voltage difference between the voltage at the input terminal and the voltage at the output terminal.

[0083] In one possible implementation, if the mutation type is an upward mutation and a mutation operating mode with an auxiliary switch array is adopted, the preset balance condition can be, for example, the voltage difference between the voltage input terminal and the two plates of the first flying capacitor, and the voltage difference at the voltage output terminal, reaching a dynamic voltage value determined by the on-resistance of the auxiliary switch array and the load current. Specific details are as follows:

[0084] Dynamic difference ΔV=(V IN -V CF -V OUT ), representing the first flying capacitance C F The charging status; when ΔV is 0, it indicates that the first flying inductor is in equilibrium. When ΔV > 0, it indicates that the change type is upward change, and it enters the upward change working mode. IN V is the voltage at the voltage input terminal. CF V is the voltage difference between the upper and lower plates of the first flying capacitor. OUT This is the voltage at the output terminal.

[0085] Through kΔV=k(V) IN -V CF -V OUT This is used to achieve the effect of suppressing the charging current of the first flying capacitor. Here, k is the suppression coefficient, a constant between 0 and 1. Its value varies depending on different considerations, such as input voltage suppression effect and operating time during sudden changes in operating state. The specific value is not limited.

[0086] Using dynamic voltage value V tr,end =R ON i CF To determine the time to switch to steady-state operating mode, where R ON i is the resistance value of the auxiliary switch in the auxiliary switch array that turns on. CF For the first flying capacitor C F The hard charging current value.

[0087] If ΔV=V tr,end If so, the dual-path power converter satisfies the preset balance condition.

[0088] The above is only an example, and in actual implementation, other preset balance condition setting methods can also be used, which are not limited in the application, and users can extend according to actual use scenarios.

[0089] In summary, the embodiment of the application provides a transient response method based on a dual-path power converter. If a voltage mutation signal of a voltage input end in the dual-path power converter is detected, the type of the voltage mutation signal is determined according to the voltage mutation signal. Then, the on-off state of the first, second, and third switching units is controlled according to the type, so that the dual-path power converter enters a mutation working mode. If the voltage difference between the two ends of the first flying capacitor and the voltage difference between the voltage input end and the voltage output end in the dual-path power converter satisfy a preset balance condition, the on-off state of the first, second, and third switching units is controlled, so that the dual-path power converter enters a steady-state working mode.

[0090] Therefore, the transient response method based on the dual-path power converter can reduce the influence of the first flying capacitor hard charging current under the input voltage mutation signal (even when the voltage fluctuation is large), thereby maintaining a stable output voltage. When processing downward mutation, the dual-path power converter is implemented based on a hybrid switched-capacitor-inductor topology structure, which can change the working mode of the dual-path power converter instantaneously, so that the converter quickly responds to the voltage mutation signal, thereby blocking the influence of the first flying capacitor hard discharge current and ensuring the stability of the output voltage. When processing upward mutation type voltage mutation signal, the adaptive conduction impedance is realized by using the auxiliary switching array, thereby realizing the effect of slowing down the charging speed of the first flying capacitor and reducing the overcharging of the output voltage due to the excessive first flying capacitor hard charging current.

[0091] In summary, the technical scheme of the transient response method based on the dual-path power converter fully utilizes the charging and discharging characteristics of the first flying capacitor, reduces the influence of the first flying capacitor on the transient characteristics of the dual-path power converter while ensuring the efficiency and current density of the dual-path power converter, and enhances the transient response capability of the dual-path power converter.

[0092] Optionally, based on the above Figure 3 The application further provides a possible implementation manner of the transient response method based on the dual-path power converter, and the steady-state working mode includes a first steady-state working mode and a second steady-state working mode.

[0093] The dual-path power converter entering the steady-state working mode includes:

[0094] The dual-path power converter alternately switches between the first steady-state operation mode and the second steady-state operation mode according to a preset period.

[0095] It should be noted that when the dual-path power converter is in steady-state operation, there are the first steady-state operation mode and the second steady-state operation mode, and the working mechanism is that the first steady-state operation mode and the second steady-state operation mode alternately work in one operation period, and the two modes (i.e., the first steady-state operation mode and the second steady-state operation mode) jointly constitute one operation period.

[0096] Figure 4 A schematic diagram of the first steady-state operation mode of the dual-path power converter according to an embodiment of the present application is shown in FIG. 2. Figure 4 As shown in FIG. 2, the second switch unit S2 is turned on, the first switch unit S1 and the third switch unit S3 are turned off, and there is only one inductor current path (i.e., i Figure 5 L ) in FIG. 2, the first flying capacitor is in a discharging state, and is discharged to the voltage output terminal through the inductor.

[0097] Alternatively, the first switch unit is controlled to be turned on, the second switch unit is controlled to be turned off, and the third switch unit is controlled to be turned on, so that the dual-path power converter enters the second steady-state operation mode.

[0098] Figure 5 A schematic diagram of the second steady-state operation mode of the dual-path power converter according to an embodiment of the present application is shown in FIG. 3. Figure 5 As shown in FIG. 3, the first switch unit S1 and the third switch unit S3 are turned on, and the second switch unit S2 is turned off. The voltage input terminal and the voltage output terminal are connected through the first flying capacitor, and the converter has two current paths of the first flying current hard charging and the inductor current soft charging.

[0099] In a specific implementation, if the withstand voltage of the first switch unit S1, the second switch unit S2, and the third switch unit S3 is all V IN -V OUT , and the withstand voltage of the flying capacitor in steady state is V IN -V OUT , if it is applied to the USB power supply architecture, considering the change of the input voltage, the input voltage is set to be in the range of 4-6V, and the output voltage is 1V.

[0100] The first steady-state operation mode and the second steady-state operation mode are both steady-state operation modes, and when the voltage mutation signal does not need to be responded, the working mode of the dual-path power converter is periodically switched between the first steady-state operation mode and the second steady-state operation mode.

[0101] Optionally, in the above Figure 3 ​On the basis of the above, the application further provides a possible implementation of the transient response method based on the dual-path power converter, according to the mutation type, the on-off state of the first switch unit, the second switch unit and the third switch unit is controlled, so that the dual-path power converter enters the mutation working mode, including:

[0102] If the mutation type is downward mutation, and the dual-path power converter is in the first steady-state working mode, the first switch unit and the third switch unit are controlled to be turned off, and the second switch unit is controlled to be turned on, so that the dual-path power converter enters the first downward mutation working mode. Figure 6 A schematic diagram of the first downward mutation working mode of the dual-path power converter is provided for an embodiment of the application; as shown in Figure 6 , the second switch unit S2 is turned on, the first switch unit S1 and the third switch unit S3 are turned off, and there is only one inductor current path (i.e. L in Figure 6 , the first flying capacitor is in a discharging state, and is discharged to the voltage output end through the inductor.

[0103] Optionally, on the basis of the above, Figure 3 , the application further provides a possible implementation of the transient response method based on the dual-path power converter, according to the mutation type, the on-off state of the first switch unit, the second switch unit and the third switch unit is controlled, so that the dual-path power converter enters the mutation working mode, including:

[0104] If the mutation type is downward mutation, and the dual-path power converter is in the second steady-state working mode, the first switch unit and the second switch unit are controlled to be turned off, and the third switch unit is controlled to be turned on, so that the dual-path power converter enters the second downward mutation working mode.

[0105] Figure 7 A schematic diagram of the second downward mutation working mode of the dual-path power converter is provided for an embodiment of the application; as shown in Figure 7 , the third switch unit S3 is in the on state, the first switch unit S1 and the second switch unit S2 are in the off state, and in this state, the first flying capacitor C F is in a floating state, and the hard charging current branch will have no current flowing (i L represents the current path in Figure 7 , so that the converter is only powered by the inductor current.

[0106] In the downward mutation working mode, the first flying capacitor is discharged through the inductor in the first downward mutation working mode until the first flying capacitor is discharged to meet the preset balance condition, and then the switching unit is switched to make the dual-path power converter enter the steady-state working mode.

[0107] In a specific implementation, in the process of coping with the downward mutation, in order to avoid the influence of the hard discharge current of the first flying capacitor in the second steady-state working mode, the dual-path power converter can be switched to the first downward mutation working mode or the second downward mutation working mode when the working time of the dual-path power converter in the second steady-state working mode in a period, so as to switch and run in the first downward mutation working mode and the second downward mutation working mode in a period.

[0108] Optionally, based on the above Figure 3 , if the first switching unit of the dual-path power converter includes a main switching unit and an auxiliary switching array connected in parallel with the main switching unit, the control module is connected with the control end of each switch in the auxiliary switching array, and the application also provides a possible implementation of the transient response method based on the dual-path power converter, Figure 8 a schematic diagram of a first upward mutation working mode of a dual-path power converter provided by an embodiment of the application; as shown in Figure 8 , according to the mutation type, the on-off state of the first switching unit, the second switching unit and the third switching unit is controlled to make the dual-path power converter enter the mutation working mode, including:

[0109] If the mutation type is upward mutation and the dual-path power converter is in the first steady-state working mode, the second switching unit S2 is controlled to be turned on, and the first switching unit S1 and the third switching unit S3 are controlled to be turned off, so that the dual-path power converter enters the first upward mutation working mode. At this time, there is only one inductor current path (i.e. L in Figure 8 ), the first flying capacitor is in a discharging state and is discharged through the inductor to the voltage output end.

[0110] Optionally, based on the above Figure 3 , the application also provides a possible implementation of the transient response method based on the dual-path power converter, Figure 9 a schematic diagram of a second upward mutation working mode of a dual-path power converter provided by an embodiment of the application; as shown in Figure 9 , according to the mutation type, the on-off state of the first switching unit, the second switching unit and the third switching unit is controlled to make the dual-path power converter enter the mutation working mode, including:

[0111] If the mutation type is upward mutation and the dual-path power converter is in the second steady-state operating mode, then the main switch unit in the first switch unit is turned off, the target switch unit in the auxiliary switch array is turned on, the second switch unit is turned on, and the third switch unit is turned off, so that the dual-path power converter enters the second upward mutation operating mode.

[0112] In the second upward sudden change operating mode, the second switching unit S2 is in the off state, while the first switching unit S1 and the third switching unit S3 are in the on state. Compared to the steady state, the first switching unit S1 is controlled by the main switch (S... main ) and auxiliary switch array (S aux1 ~S auxn , with S aux1 ~S aux4 (For example) It consists of a main switch (S) main The auxiliary switch array (S) is turned on in the second steady-state operating mode and turned off in the second upward abrupt mode, with minimal conduction loss to ensure low conduction loss and high conversion efficiency in steady state. aux1 ~S auxn It has a larger on-resistance, turns on in the second upward abrupt operating mode, and turns off in the second steady-state mode. The impedance of each auxiliary switch can be set according to actual needs. For example, the impedance relationship of each auxiliary switch in an auxiliary switch array including four auxiliary switches can be set to satisfy:

[0113] R aux1 >R aux2 >R aux3 >R aux4 >>R main , where R auxn R is the impedance of the nth auxiliary switch. main The impedance of the main switch.

[0114] In the first upward abrupt operating mode, by slowing down the floating node voltage V CT The rate of change of the voltage across the upper plate of the first flying capacitor (i.e., the voltage across the upper plate of the first flying capacitor C) slows down the first flying capacitor C. F The charging speed is achieved, thus suppressing the hard charging current of the first flying capacitor.

[0115] In one specific implementation, in order to avoid the influence of the hard charging current of the first flying capacitor in the second steady-state operating mode during the process of dealing with upward mutation, the dual-path power converter can switch to the first upward mutation operating mode or the second upward mutation operating mode when it is in the second steady-state operating mode of the cycle, so as to switch between the first upward mutation operating mode and the second upward mutation operating mode cycle.

[0116] Optionally, in the above Figure 3Based on this, this application also provides a possible implementation of a transient response method based on a dual-path power converter, which controls the on / off states of the first, second, and third switching units to enable the dual-path power converter to enter a steady-state operating mode, including:

[0117] The first switch unit is controlled to be disconnected, the second switch unit is controlled to be turned on, and the third switch unit is controlled to be disconnected, so that the dual-path power converter enters a first steady-state operating mode; or, the first switch unit is controlled to be turned on, the second switch unit is controlled to be disconnected, and the third switch unit is controlled to be turned on, so that the dual-path power converter enters a second steady-state operating mode.

[0118] If the dual-path power converter is in steady-state operating mode (i.e., operating periodically in the first and second steady-state modes) and a downward voltage surge signal is detected, the control module switches the dual-path power converter to a downward surge mode (i.e., operating periodically in the first and second downward surge modes). When the dual-path power converter meets a preset balance condition in the second downward surge mode, the control module switches the dual-path power converter back to the second steady-state operating mode.

[0119] If the dual-path power converter is in steady-state operating mode (i.e., operating periodically in the first and second steady-state modes) and detects an upward-sudden voltage surge signal, the control module switches the dual-path power converter to an upward-sudden mode (i.e., operating periodically in the first and second upward-sudden modes). When the dual-path power converter meets a preset balance condition in the second upward-sudden mode, the control module switches the dual-path power converter back to the second steady-state operating mode.

[0120] Optional, in Figure 9 Based on this, this application also provides a possible implementation of a transient response method based on a dual-path power converter, which controls the main switch unit in the first switching unit to be disconnected, the target switch unit in the auxiliary switch array to be turned on, the second switch unit to be turned on, and the third switch unit to be disconnected, so that before the dual-path power converter enters the second upward sudden change operating mode, the method further includes:

[0121] Based on the dynamic voltage difference of the first flying capacitor and the charging current of the first flying capacitor, the target switching unit in the auxiliary switching array is determined, wherein the dynamic voltage difference is the difference between the voltage at the voltage input terminal and the voltage difference between the two plates of the first flying capacitor and the voltage at the voltage output terminal.

[0122] Figure 10 This application provides a schematic diagram illustrating the auxiliary switch selection principle in an auxiliary switch array according to an embodiment of the present application. Figure 10As shown, the control module (or the adaptive state selector in the control module) measures the circuit state and generates appropriate state selection bit signals to select the appropriate auxiliary switch S aux to be turned on. The control module matches different auxiliary switches S aux to be turned on for different load current and input transient range cases through the formula. Impedance:

[0123] i CF R aux = kAV = k(V IN -V CF -V OUT );

[0124]

[0125] wherein AV is the dynamic difference value representing the charging condition of the flying capacitor C F , and when AV is 0, it represents the steady state; k is the suppression coefficient, I CF is the first flying capacitor hard charging current; and I load is the load current.

[0126] Meanwhile, the voltage V aux,i of the auxiliary switch array is calculated according to the following formula:

[0127] V aux,i = mkAV = m i k(V i -V IN -V CF -V OUT );

[0128] wherein m i is a binary coefficient between 0 or 1, which is used to determine the on-off condition of each auxiliary switch.

[0129] In a specific implementation, the first auxiliary switch (S aux1 ) can be always turned on in the second upward transient operation mode to meet the requirement of maximum impedance.

[0130] As the first flying capacitor is gradually charged, the dynamic difference value AV will gradually decrease, and according to the change of the state selection bit signal, the second to fourth auxiliary switches (S aux2 -S aux4 ) are gradually turned on in sequence to reduce the impedance through parallel connection with S aux1 , thereby realizing dynamic matching. The auxiliary switch array (S aux1 -S aux4When the first and the second flying capacitor are both in the conducting state, the converter will reach the transient state. The adaptive state switching mode determines the time to switch back to the steady state working mode (the second steady state working mode) according to the size of the load current. The switching point V tr,end The adaptive state switching mode can be determined by the formula V tr,end = R ON i CF The state switching is realized by comparing V tr,end with the dynamic difference AV. Wherein R ON = R aux,1 / / R aux,2 / / R aux,3 / / R aux,4 The stage from the switching moment to the return to the steady state can be called the adaptive state switching stage.

[0131] In a specific implementation, in the process of coping with the upward mutation, in order to avoid the influence of the first flying capacitor hard charging current in the second steady state working mode, the dual-path power converter can be switched to the second upward mutation working mode.

[0132] Optionally, based on the above Figure 3 , the application further provides a possible implementation of a transient response method based on a dual-path power converter, Figure 11 a flowchart of a transient response method based on a dual-path power converter according to another embodiment of the application; as shown in the figure, before controlling the on-off state of the first, second and third switch units according to the mutation type, the method comprises: Figure 11

[0133] Step 111: generating an error voltage signal according to the output voltage of the voltage output end of the dual-path power converter and the preset reference voltage.

[0134] Step 112: generating a reference clock signal according to the error voltage signal and the preset triangular wave signal.

[0135] Step 113: generating a non-overlapping clock signal according to the reference clock signal.

[0136] Controlling the on-off state of the first, second and third switch units according to the mutation type comprises:

[0137] Step 114: generating a control signal according to the mutation type and the non-overlapping clock signal.

[0138] Step 115: controlling the on-off state of the first, second and third switch units according to the control signal.

[0139] ​In order to generate a clock signal that can enable the control module in the transient response control circuit based on the dual-path power converter to work normally, first, the output voltage of the voltage output end needs to be sampled and compared with the reference voltage to obtain an error voltage. Then, the error voltage signal and the triangular wave signal are compared to obtain a reference clock signal.

[0140] Considering the influence of parasitic capacitance on the power switch, if the reference clock signal is used as the control signal, there is a risk of short circuit. In order to avoid short circuit, a non-overlapping clock signal needs to be generated according to the reference clock signal, for example, the reference clock signal can be used to generate a non-overlapping clock signal through a non-overlapping clock generator. After the non-overlapping clock signal passes through the control module (or the dynamic adaptive state selector in the control module), a control signal for finally controlling the operation of the dual-path power converter is generated. That is, in the control, the on-off state of the first switching unit, the second switching unit and the third switching unit is controlled according to the control signal.

[0141] Similar to the above method, after generating a non-overlapping clock signal, the on-off state of the first switching unit, the second switching unit and the third switching unit is controlled to make the dual-path power converter enter a steady state working mode, including:

[0142] According to the mutation type and the non-overlapping clock signal, a control signal is generated.

[0143] According to the control signal, the on-off state of the first switching unit, the second switching unit and the third switching unit is controlled.

[0144] The present application will not be described here.

[0145] In summary, the transient response method based on the dual-path power converter proposed in the present application can reduce the deviation voltage caused by the coupling of the input signal to the output signal in response to the voltage mutation signal of the voltage input end in the dual-path power converter. While meeting the high-efficiency transmission demand of the dual-path power converter, it also meets the growing demand for the development of industrial and automation electronic technology.

[0146] Further, the application can realize the effect of adaptive output coupling signal reduction in the case of large input variation range and wide load current range, and reduce the impact of input signal sudden change on the output signal. The application uses the steady-state working mode and structural characteristics of the hybrid switched-capacitor-inductor DC-DC converter, and significantly reduces the impact of output signal mutation coupling caused by the first flying capacitor hard charging current through the two ways of blocking the first flying capacitor hard charging path and adaptively conducting impedance (auxiliary switch array). At the same time, in order to be applicable to the application of wide load current range, the application can also select the working state of the auxiliary switch array according to the size of the load current. Further, the application expands the application range and enhances the system performance of the dual-path power converter. The low output signal fluctuation effect is realized in the case of wide input variation range and wide load current range.

[0147] Figure 12 The simulation results of the transient response method based on the dual-path power converter provided by an embodiment of the application are shown in FIG. 6. Figure 12 As shown in FIG. 6, the downward mutation working mode and the upward mutation working mode are simulated and verified in the case of load current of 500 mA and 5 A. The simulation results show that the output voltage fluctuation is significantly reduced in the case of 1 V mutation of the input signal.

[0148] The following describes the transient response control circuit based on the dual-path power converter, the transient response device based on the dual-path power converter, and the like, and the specific implementation process and technical effects are described above, and the following will not be described again.

[0149] An embodiment of the application provides a possible implementation example of a transient response control circuit based on a dual-path power converter, which can execute the transient response method based on the dual-path power converter provided by the above-described embodiment. Figure 13 An embodiment of the application provides a schematic diagram of a transient response circuit based on a dual-path power converter. As shown in FIG. 7, Figure 13 The transient response circuit based on the dual-path power converter includes a downward mutation detection module 110, an upward mutation detection module 120, and a control module 190. The outputs of the downward mutation detection module and the upward mutation detection module are connected to the input of the control module.

[0150] The control module 190 is configured to execute the steps of the transient response method based on the dual-path power converter according to the voltage mutation signal output by the downward mutation detection module 110 or the upward mutation detection module 120.

[0151] As shown in FIG. 7, Figure 13The figure 110 is a downward mutation detection module; 120 is an upward mutation detection module; 130 is a hysteresis comparator for generating a downward mutation working state selection signal; 140 is a comparator array for generating a state selection bit signal for entering the upward mutation working state; 150 is a passive RC filter network for obtaining the DC component of the inductor current; 160 is a subtractor for dynamically detecting the difference between the input and output signals; 170 is a subtractor for dynamically detecting the first flying capacitor voltage; 180 is a subtractor for dynamically detecting the first flying capacitor hard charging state; 190 is a dynamic adaptive state selector; 200 is a non-overlapping clock signal generator; 210 is an error amplifier; 220:V OUT The voltage sampling resistor; 230: triangular wave signal generator; 240: comparator for generating a reference clock signal; 250: control loop.

[0152] Based on the transient response circuit of the dual-path power converter described above, if the input voltage at the voltage input end has an upward mutation, V IN -V OUT >V CF ,V CF,REF >V CF,SEN , the subtractor 180 outputs a positive voltage, and the upward mutation detection module enters the working state. The dual-path power converter works in the upward mutation working mode. In the second upward mutation working mode, the main switch S main is turned off. According to the size of the load current, the dynamic adaptive state selector selects different auxiliary switch arrays in the initial stage. If the load current is 500mA, only auxiliary switches S aux1 , S aux2 are in the on state in the initial stage, and S aux3 and S aux4 are in the off state. If the load current is 5A, S aux1 , S aux2 and S aux3 are in the on state in the initial stage, and S aux4 is in the off state. As the flying capacitor is gradually charged, the auxiliary switches in the off state are selected to be turned on in turn, and finally the dual-path power converter enters the transient state. After entering the transient state, as the dynamic difference kΔV output by the subtractor gradually decreases, it reaches the dynamic value V tr,end = R ON i CF determined by the load current, the transient working state ends, and the circuit switches back to the main switch S main working mode, i.e. the first steady state working mode. The output of the dual-path power converter switches back to the main switch S mainThe time it takes for the dual-path power converter output to return to stability after the operating mode has been changed is called the adaptive state switching phase. Due to differences in load current, the transient termination point V... tr,end =R ON i CF There will be differences; if the load current is 500mA, V tr,end The smaller the value, the shorter the corresponding adaptive state transition time. Conversely, if the load current is 5A, V... tr,end The load current is relatively large, resulting in a longer adaptive state switching phase. Therefore, this scheme is suitable for a wide range of load current variations, and can effectively reduce output overcharging caused by abrupt coupling of the input signal within a wide load current range.

[0153] Based on the transient response circuit of the dual-path power converter described above, if the input voltage at the voltage input terminal experiences a downward sudden change, V IN -V OUT <V CF V CF,REF <V CF,SEN When the logic level of the output signal of the hysteresis comparator 130 changes from 0 to 1, the input down-sudden change detection module enters the working state, and the dual-path power converter enters the down-sudden change operating mode. In the second down-sudden change operating mode, the first switching unit is turned off, the upper plate of the first flying capacitor is in a floating state, and the input and output are isolated by the first flying capacitor. Therefore, the hard charging current of the first flying capacitor is zero, and the output current of the dual-path power converter is entirely provided by the inductor current. As the first flying capacitor is gradually discharged in the first down-sudden change operating mode, V IN -V OUT With V CF The value will get closer and closer. When the first flying capacitor sampling voltage V CF,SEN With the reference voltage V of the flying capacitor CF,REF When the difference reaches the hysteresis window of the hysteresis comparator, the first flying capacitor voltage V CF Discharged to V IN -V OUT Once the expected steady state is reached, the logic level of the output signal of the hysteresis comparator 130 switches from 1 to 0, and the dual-path power converter ends the transient operation stage and switches back to the steady-state operation state (i.e., the first steady-state operation mode and the second steady-state operation mode).

[0154] The circuit described above is used to execute the method provided in the foregoing embodiments. Its implementation principle and technical effect are similar, and will not be described again here.

[0155] This application provides a possible implementation example of a transient response device based on a dual-path power converter, which can execute the transient response method based on a dual-path power converter provided in the above embodiments. Figure 14A schematic diagram of a transient response device based on a dual-path power converter is provided for an embodiment of the present application. As shown in Figure 14 The transient response device based on the dual-path power converter comprises:

[0156] A mutation type determination module 1401 is configured to determine a mutation type of the voltage mutation signal according to the voltage mutation signal if the voltage mutation signal of the voltage input end of the dual-path power converter is detected.

[0157] A mutation control module 1402 is configured to control on-off states of the first switching unit, the second switching unit and the third switching unit according to the mutation type, so that the dual-path power converter enters a mutation working mode.

[0158] A steady state control module 1403 is configured to control on-off states of the first switching unit, the second switching unit and the third switching unit if a voltage difference between two ends of the first flying capacitor of the dual-path power converter and a voltage difference between the voltage input end and the voltage output end satisfy a preset balance condition, so that the dual-path power converter enters a steady state working mode.

[0159] Optionally, the steady state control module 1403 is configured to control the dual-path power converter to alternately switch between the first steady state working mode and the second steady state working mode according to a preset period.

[0160] Optionally, the mutation control module 1402 is configured to control the first switching unit and the third switching unit to be turned off and the second switching unit to be turned on if the mutation type is downward mutation and the dual-path power converter is in the first steady state working mode, so that the dual-path power converter enters a first downward mutation working mode.

[0161] Optionally, the mutation control module 1402 is configured to control the first switching unit and the second switching unit to be turned off and the third switching unit to be turned on if the mutation type is downward mutation and the dual-path power converter is in the second steady state working mode, so that the dual-path power converter enters a second downward mutation working mode.

[0162] Optionally, the mutation control module 1402 is configured to control the first switching unit and the third switching unit to be turned off and the second switching unit to be turned on if the mutation type is upward mutation and the dual-path power converter is in the first steady state working mode, so that the dual-path power converter enters a first upward mutation working mode.

[0163] Optionally, the first switching unit in the dual-path power converter comprises a main switching unit and an auxiliary switching array connected in parallel with the main switching unit; the control module is connected with the control end of each switch in the auxiliary switching array; the mutation control module 1402 is configured to, if the mutation type is upward mutation and the dual-path power converter is in the second steady-state working mode, control the main switching unit in the first switching unit to be turned off, the target switching unit in the auxiliary switching array to be turned on, the second switching unit to be turned on, and the third switching unit to be turned off, so that the dual-path power converter enters the second upward mutation working mode.

[0164] Optionally, the steady-state control module 1403 is configured to control the first switching unit to be turned off, the second switching unit to be turned on, and the third switching unit to be turned off, so that the dual-path power converter enters the first steady-state working mode; or control the first switching unit to be turned on, the second switching unit to be turned off, and the third switching unit to be turned on, so that the dual-path power converter enters the second steady-state working mode; or control the dual-path power converter to alternately switch between the first steady-state working mode and the second steady-state working mode according to a preset period.

[0165] Optionally, the target switching unit determination module is configured to determine the target switching unit in the auxiliary switching array according to a dynamic voltage difference of the first flying capacitor, a charging current of the first flying capacitor, and a voltage difference between the voltage input end voltage and the voltage of the two poles of the first flying capacitor.

[0166] Optionally, the non-overlapping clock signal generation module is configured to generate an error voltage signal according to an output voltage of the voltage output end of the dual-path power converter and a preset reference voltage; generate a reference clock signal according to the error voltage signal and a preset triangular wave signal; and generate a non-overlapping clock signal according to the reference clock signal.

[0167] The mutation control module 1402 is configured to generate a control signal according to the mutation type and the non-overlapping clock signal; and control the on-off state of the first switching unit, the second switching unit, and the third switching unit according to the control signal, so that the dual-path power converter enters the mutation working mode.

[0168] Optionally, the steady-state control module 1403 is configured to, if it is detected that the dual-path power converter meets a preset balance condition, generate a control signal according to the non-overlapping clock signal; and control the on-off state of the first switching unit, the second switching unit, and the third switching unit according to the control signal, so that the dual-path power converter enters the steady-state working mode.

[0169] The above device is used to execute the method provided by the foregoing embodiments, and has similar implementation principles and technical effects, which are not described here again.

[0170] The modules above can be one or more integrated circuits configured to implement the methods above, for example, one or more Application Specific Integrated Circuits (ASICs), or one or more Digital Signal Processors (DSPs), or one or more Field Programmable Gate Arrays (FPGAs), etc. For another example, when a certain module above is implemented in the form of a processing element scheduling code, the processing element can be a general purpose processor, such as a Central Processing Unit (CPU) or other processor capable of executing code. For another example, the modules can be integrated together to be implemented in the form of a system-on-a-chip (SOC).

[0171] In addition, each functional unit in each embodiment of the present application can be integrated in one processing unit, or each unit can exist physically separately, or two or more units can be integrated in one unit. The integrated unit can be implemented in the form of hardware or in the form of hardware plus software functional unit.

[0172] The above merely provides the specific implementation of the present application, but the protection scope of the present application is not limited to this. Any person skilled in the art can easily think of the changes or replacements within the technical scope disclosed by the present application, which should be covered by the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A method for transient response based on dual-path power converter, characterized in that, The method is applied to a control module connected to control ends of a first switching unit, a second switching unit and a third switching unit in a dual-path power converter; The dual-path power converter comprises a first flying capacitor, a second flying capacitor, an inductor, the first switching unit, the second switching unit and the third switching unit; An upper plate of the first flying capacitor is connected to a voltage input end through the first switching unit, and is also connected to a voltage output end through the second switching unit; a lower plate of the first flying capacitor is grounded through the inductor, and is also connected to the voltage output end through the third switching unit; an upper plate of the second flying capacitor is connected to the voltage output end, and a lower plate of the second flying capacitor is grounded; The method comprises: If a voltage mutation signal of a voltage input end in the dual-path power converter is detected, a mutation type of the voltage mutation signal is determined according to the voltage mutation signal; According to the mutation type, on-off states of the first switching unit, the second switching unit and the third switching unit are controlled, so that the dual-path power converter enters a mutation working mode; If it is detected that the dual-path power converter satisfies a preset balance condition, on-off states of the first switching unit, the second switching unit and the third switching unit are controlled, so that the dual-path power converter enters a steady-state working mode.

2. The method of claim 1, wherein, The control of the on-off states of the first switching unit, the second switching unit and the third switching unit according to the mutation type, so that the dual-path power converter enters the mutation working mode, comprises: If the mutation type is downward mutation, and the dual-path power converter is in a first steady-state working mode, the first switching unit and the third switching unit are controlled to be turned off, and the second switching unit is controlled to be turned on, so that the dual-path power converter enters a first downward mutation working mode.

3. The method of claim 1, wherein, The control of the on-off states of the first switching unit, the second switching unit and the third switching unit according to the mutation type, so that the dual-path power converter enters the mutation working mode, comprises: If the mutation type is downward mutation, and the dual-path power converter is in a second steady-state working mode, the first switching unit and the second switching unit are controlled to be turned off, and the third switching unit is controlled to be turned on, so that the dual-path power converter enters a second downward mutation working mode.

4. The method of claim 1, wherein, The control of the on-off states of the first switching unit, the second switching unit and the third switching unit according to the mutation type, so that the dual-path power converter enters the mutation working mode, comprises: If the mutation type is upward mutation, and the dual-path power converter is in a first steady-state working mode, the first switching unit and the third switching unit are controlled to be turned off, and the second switching unit is controlled to be turned on, so that the dual-path power converter enters a first upward mutation working mode.

5. The method of claim 1, wherein, The first switch unit in the dual-path power converter includes a main switch unit and an auxiliary switch array connected in parallel with the main switch unit; the control module is connected with the control end of each switch in the auxiliary switch array; the control of the on-off state of the first switch unit, the second switch unit and the third switch unit according to the mutation type is used to make the dual-path power converter enter the mutation working mode, including: If the mutation type is upward mutation and the dual-path power converter is in the second steady-state working mode, the main switch unit in the first switch unit is controlled to be turned off, the target switch unit in the auxiliary switch array is controlled to be turned on, the second switch unit is controlled to be turned on, and the third switch unit is controlled to be turned off, so that the dual-path power converter enters the second upward mutation working mode.

6. The method of claim 1, wherein, The steady-state working mode includes a first steady-state working mode and a second steady-state working mode; the control of the on-off state of the first switch unit, the second switch unit and the third switch unit is used to make the dual-path power converter enter the steady-state working mode, including: The first switch unit is controlled to be turned off, the second switch unit is controlled to be turned on, and the third switch unit is controlled to be turned off, so that the dual-path power converter enters the first steady-state working mode; or The first switch unit is controlled to be turned on, the second switch unit is controlled to be turned off, and the third switch unit is controlled to be turned on, so that the dual-path power converter enters the second steady-state working mode; or The dual-path power converter is controlled to be switched between the first steady-state working mode and the second steady-state working mode according to a preset period.

7. The method of claim 5, wherein, Before the control of the main switch unit in the first switch unit to be turned off, the target switch unit in the auxiliary switch array to be turned on, the second switch unit to be turned on, and the third switch unit to be turned off, so that the dual-path power converter enters the second upward mutation working mode, the method further includes: The target switch unit in the auxiliary switch array is determined according to the dynamic voltage difference of the first flying capacitor and the charging current of the first flying capacitor, wherein the dynamic voltage difference is the voltage difference between the voltage input end voltage and the voltage of the two poles of the first flying capacitor, and the difference of the voltage output end voltage.

8. The method of claim 1, wherein, Before the control of the on-off state of the first switch unit, the second switch unit and the third switch unit according to the mutation type, the method further includes: An error voltage signal is generated according to the output voltage of the voltage output end of the dual-path power converter and a preset reference voltage; A reference clock signal is generated according to the error voltage signal and a preset triangular wave signal; A non-overlapping clock signal is generated according to the reference clock signal; The control of the on-off state of the first switch unit, the second switch unit and the third switch unit according to the mutation type includes: A control signal is generated according to the mutation type and the non-overlapping clock signal; According to the control signal, on-off states of the first switch unit, the second switch unit and the third switch unit are controlled.

9. A transient response control circuit for a dual-path power converter, comprising: The transient response control circuit comprises a downward mutation detection module, an upward mutation detection module and a control module; outputs of the downward mutation detection module and the upward mutation detection module are connected with an input end of the control module; The control module is used for executing steps of the transient response method based on the dual-path power converter according to a voltage mutation signal output by the downward mutation detection module or the upward mutation detection module.

10. A device for transient response based on a dual-path power converter, characterized in that, Comprise: A mutation type determination module is used for determining a mutation type of a voltage mutation signal of a voltage input end of the dual-path power converter according to the voltage mutation signal if the voltage mutation signal is detected; A mutation control module is used for controlling on-off states of the first switch unit, the second switch unit and the third switch unit according to the mutation type, so that the dual-path power converter enters a mutation working mode; A steady state control module is used for controlling on-off states of the first switch unit, the second switch unit and the third switch unit according to a voltage difference between two ends of the first flying capacitor and a voltage difference between the voltage input end and the voltage output end of the dual-path power converter if the voltage difference and the voltage difference satisfy a preset balance condition, so that the dual-path power converter enters a steady state working mode.

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