Dc-dc conversion circuit, apparatus and method for fast load transient response

Abstract

This invention discloses a DC-DC conversion circuit, device, and fast load transient response method. The circuit includes: a DC-DC conversion module, a transient detection module, and a voltage regulator module; the output terminal of the DC-DC conversion module is connected to the load; the DC-DC conversion module also includes an output voltage feedback terminal for feedback of the output voltage error; the first input terminal of the transient detection module is connected to the output voltage feedback terminal of the DC-DC conversion module, the output terminal of the transient detection module is connected to the control terminal of the voltage regulator module, and the charging / discharging terminal of the voltage regulator module is connected to the output terminal of the DC-DC conversion module; the transient detection module generates a charging / discharging control signal based on the voltage error signal output by the DC-DC conversion module, and the voltage regulator module charges or discharges the output terminal of the DC-DC conversion module according to the charging / discharging control signal. The solution provided by this invention can significantly improve the load transient response speed.

Description

Technical Field

[0001] This invention relates to the field of current conversion technology, and more particularly to a DC-DC conversion circuit, device, and fast load transient response method. Background Technology

[0002] The load transient response speed of a DC-DC converter is one of its important performance indicators. By optimizing the converter control loop, the inductor current can be varied at full duty cycle, thereby improving its transient response speed. However, the response speed is always limited by the rise / fall slope of the inductor current.

[0003] Currently, traditional transient enhancement techniques for DC-DC converters often employ strategies such as increasing the switching frequency and reducing the inductance value to accelerate the rise / fall rate of the inductor current. However, as the switching frequency increases, the power transistor's conduction time is significantly compressed, placing stringent demands on the design of the control and drive circuits. Simultaneously, high-frequency operation significantly increases the switching losses of the power transistor, leading to a sharp decline in system conversion efficiency. While multiphase topologies can increase the rate of change of inductor current while maintaining the switching frequency and single-phase inductance value, the inherent phase difference between phases causes some phases to experience response delays during load transients, severely limiting further optimization of the overall transient response speed. Although nonlinear control techniques can eliminate phase differences during transients to accelerate the response, they still cannot overcome the physical limitation of the inductor current rise / fall rate. Summary of the Invention

[0004] This invention provides a DC-DC conversion circuit, device, and fast load transient response method to overcome the limitation of inductor current slope and significantly improve the load transient response speed of DC-DC converters when load current jumps of different magnitudes.

[0005] According to a first aspect of the present invention, a DC-DC conversion circuit is provided, comprising: a DC-DC conversion module, a transient detection module, and a voltage regulator module;

[0006] The output terminal of the DC-DC converter module is connected to the load; the DC-DC converter module also includes an output voltage feedback terminal, which is used to feedback the error of the voltage at the output terminal;

[0007] The first input terminal of the transient detection module is connected to the output voltage feedback terminal of the DC-DC conversion module, the output terminal of the transient detection module is connected to the control terminal of the voltage regulator module, and the charging and discharging terminal of the voltage regulator module is connected to the output terminal of the DC-DC conversion module.

[0008] The transient detection module is used to generate a charge / discharge control signal based on the voltage error signal output by the DC-DC converter module, and the voltage regulator module is used to charge or discharge the output terminal of the DC-DC converter module based on the charge / discharge control signal.

[0009] Optionally, the DC-DC conversion module includes: a DC-DC conversion unit, an energy storage unit, and an error detection unit;

[0010] The output terminal of the DC-DC converter is connected to the first input terminal of the error detection unit, the second input terminal of the error detection unit is connected to a reference voltage, and the output terminal of the error detection unit is connected to the input terminal of the transient detection module; the error detection unit is used to output a voltage error signal based on the reference voltage and the voltage at the output terminal of the DC-DC converter.

[0011] The first end of the energy storage unit is connected to the output end of the DC-DC conversion unit, and the second end is grounded.

[0012] Optionally, the transient detection module further includes a first threshold input terminal and a second threshold input terminal, wherein the first threshold input terminal is connected to a first threshold voltage and the second threshold input terminal is connected to a second threshold voltage; the transient detection module is used to generate a charging control signal when the voltage error signal is greater than the first threshold voltage and to generate a discharging control signal when the voltage error signal is less than the second threshold voltage.

[0013] Optionally, the voltage regulator module includes a charging voltage regulator unit and a discharging voltage regulator unit;

[0014] The first terminal of the charging voltage regulator unit is connected to the power supply, the second terminal of the charging voltage regulator unit is connected to the first terminal of the energy storage unit, and the control terminal of the charging voltage regulator unit is connected to the first output terminal of the transient detection module.

[0015] The first terminal of the discharge voltage regulator unit is connected to the first terminal of the energy storage unit, the second terminal of the discharge voltage regulator unit is grounded, and the control terminal of the discharge voltage regulator unit is connected to the second output terminal of the transient detection module.

[0016] Optionally, the transient detection module includes multiple first output terminals; the charging voltage regulation unit includes multiple charging units connected in parallel.

[0017] The first end of each of the multiple charging units is connected to a power source, the second end of each of the multiple charging units is connected to the first end of the energy storage unit, and the control terminals of each of the multiple charging units are respectively connected to the multiple first output terminals of the transient detection module; the charging voltage regulator unit is used to control the multiple charging units to charge the energy storage unit sequentially according to the charging control signal.

[0018] Optionally, the charging unit includes a first switching unit and a first driving unit;

[0019] One end of the first switching unit is connected to the power supply, and the other end is connected to the first end of the energy storage unit. The input end of the first driving unit is connected to the first output end of the transient detection module, and the output end of the first driving unit is connected to the control end of the first switching unit.

[0020] Optionally, the transient detection module includes multiple second output terminals; the discharge voltage regulation unit includes multiple discharge units connected in parallel.

[0021] The first terminal of each of the plurality of discharge units is grounded, the second terminal of each of the plurality of discharge units is connected to the first terminal of the energy storage unit, and the control terminal of each of the plurality of discharge units is respectively connected to the plurality of second output terminals of the transient detection module; the discharge voltage stabilizing unit is used to control the plurality of discharge units to discharge to the energy storage unit according to the discharge control signal.

[0022] Optionally, the discharge unit includes a second switching unit and a second driving unit;

[0023] One end of the second switching unit is grounded, and the other end is connected to the first end of the energy storage unit. The input end of the second driving unit is connected to the second output end of the transient detection module, and the output end of the second driving unit is connected to the control end of the second switching unit.

[0024] According to a second aspect of the present invention, a fast load transient response method for DC-DC conversion is provided, which is executed using a DC-DC conversion circuit as described in any one of the first aspects, the fast load transient response method for DC-DC conversion comprising:

[0025] Obtain the voltage at the output terminal of the DC-DC converter module;

[0026] The voltage error signal is output based on the reference voltage and the voltage at the output terminal of the DC-DC conversion module;

[0027] A charge / discharge control signal is generated based on the voltage error signal;

[0028] The output terminal of the DC-DC converter module is charged or discharged according to the charge / discharge control signal.

[0029] According to a third aspect of the present invention, a DC-DC converter with fast load transient response is provided, comprising the DC-DC converter circuit described in any of the first aspects.

[0030] The technical solution provided in this invention utilizes the output voltage feedback terminal of the DC-DC converter module to feed back a voltage error signal to the transient detection module. This voltage error signal reflects the voltage change at the output terminal of the DC-DC converter module. The transient detection module determines the load's transient demand based on the voltage error signal and generates a charge / discharge control signal. The voltage regulation module charges or discharges the output terminal of the DC-DC converter module according to the received charge / discharge control signal, thereby enabling the output voltage of the DC-DC converter module to respond quickly to adapt to load transients. The DC-DC converter circuit provided in this invention rapidly adjusts the output voltage by introducing an additional charge / discharge path to charge and discharge the output terminal. Compared to existing solutions that change the internal switching frequency and inductance value of the DC-DC converter module, it is not limited by the inductor current slope and can significantly improve the load transient response speed under load current transients of varying magnitudes, achieving rapid load transient response.

[0031] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of the present invention, nor is it intended to limit the scope of the invention. Other features of the invention will become readily apparent from the following description. Attached Figure Description

[0032] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0033] Figure 1 A schematic diagram of a four-phase buck converter with fast transient response provided in related technologies;

[0034] Figure 2 This is a schematic diagram of a DC-DC conversion circuit provided in an embodiment of the present invention;

[0035] Figure 3 A schematic diagram of another DC-DC conversion circuit provided in an embodiment of the present invention;

[0036] Figure 4 A schematic diagram of another DC-DC conversion circuit provided in an embodiment of the present invention;

[0037] Figure 5 A schematic diagram of another DC-DC conversion circuit provided in an embodiment of the present invention;

[0038] Figure 6 A schematic diagram of another DC-DC conversion circuit provided in an embodiment of the present invention;

[0039] Figure 7 A signal timing diagram of a DC-DC conversion circuit provided in an embodiment of the present invention;

[0040] Figure 8 A flowchart of a fast load transient response method for DC-DC conversion provided in an embodiment of the present invention. Detailed Implementation

[0041] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0042] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0043] Figure 1 This is a schematic diagram of a four-phase buck converter with fast transient response, as provided in related technologies. Figure 1As shown, this DC-DC converter achieves rapid load transient response by increasing the switching frequency, reducing the inductance value, employing a four-phase topology, and introducing nonlinear control during transients to eliminate the delay caused by phase differences between phases. In steady-state operation, the transient detection circuit 103 always outputs a low-level transient detection signal, Droop_det. When a transient change occurs in the load, the output voltage Vout detects the transient in the transient detection circuit, and the comparator outputs a high-level transient detection signal, Droop_det. This signal is input to the four-phase controller 102, simultaneously setting PWM1-PWM4 to 1, and simultaneously setting SH1-SH4 in the four-phase power stages 101 to 0, allowing the four-phase inductors to charge the load simultaneously. By employing a multi-phase topology and using nonlinear control to enable simultaneous charging and discharging of the load by each phase inductor during transients, the rise / fall slope of the inductor current is increased while maintaining the switching frequency and single-phase inductance value. Although this effectively improves the transient response speed, it is still limited by the rise / fall slope of the inductor current, which is inversely proportional to the inductance value. The inductor current slope represents the inductor's current-carrying / discharging capability to the load during transient load transitions. A larger slope indicates a larger rate of change in the charging / discharging current to the load, resulting in faster output voltage recovery, smaller output voltage undershoot / overshoot, and a faster load transient response speed.

[0044] Figure 2 This is a schematic diagram of a DC-DC conversion circuit provided in an embodiment of the present invention. Figure 2 As shown, the DC-DC conversion circuit includes: a DC-DC conversion module 100, a transient detection module 200, and a voltage regulator module 300; the output terminal of the DC-DC conversion module 100 is connected to the load R; the DC-DC conversion module 100 also includes an output voltage feedback terminal V. FB Output voltage feedback terminal V FB Voltage V used for feedback output out Error; the first input terminal of the transient detection module 200 is connected to the output voltage feedback terminal V of the DC-DC conversion module 100. FB The transient detection module 200 is connected to the control terminal of the voltage regulator module 300, and the charging / discharging terminal of the voltage regulator module 300 is connected to the output terminal of the DC-DC converter module 100. The transient detection module 200 is used to detect the voltage error signal V output by the DC-DC converter module 100. EA A charge / discharge control signal is generated, and the voltage regulator module 300 is used to charge or discharge the output terminal of the DC-DC converter module 100 according to the charge / discharge control signal.

[0045] Specifically, the DC-DC converter module 100 can convert the voltage output from the DC power supply into different voltages for output. For example... Figure 2As shown, the input terminal of the DC-DC converter module 100 can be connected to a DC voltage source Vin, and the output terminal of the DC-DC converter module 100 can be connected to a load R. The voltage of the DC voltage source Vin is converted by the DC-DC converter module 100 and supplied to the load R. When a transient change occurs on the branch where the load R is located, the voltage V at the output terminal of the DC-DC converter module 100 is required. out It responds quickly to adapt to the changing demands of the load R. The output voltage feedback terminal V of the DC-DC converter module 100... FB It can be connected to the input terminal of the transient detection module 200 to feed back the voltage V at the output terminal of the transient detection module 200. out The change in voltage. When a transient change occurs on the load R, the output voltage feedback terminal V of the DC-DC converter module 100... FB It will send a voltage error signal V to the transient detection module 200. EA Voltage error signal V EA It can reflect the voltage V at the output terminal of the DC-DC converter module 100. out The transient detection module 200 can detect changes in the voltage error signal V. EA Judgment and output terminal V out When the connected load R experiences a positive or negative switching, a charge / discharge control signal is generated. The voltage regulator module 300 can charge or discharge the output of the DC-DC converter module 100 according to the received charge / discharge control signal, thereby increasing the voltage V at the output of the DC-DC converter module 100. out It can respond quickly to adapt to changes in load R.

[0046] The technical solution provided in this invention utilizes the output voltage feedback terminal of the DC-DC converter module to feed back a voltage error signal to the transient detection module. This voltage error signal reflects the voltage change at the output terminal of the DC-DC converter module. The transient detection module determines the load's transient demand based on the voltage error signal and generates a charging / discharging control signal. The voltage regulation module charges or discharges the output terminal of the DC-DC converter module according to the received charging / discharging control signal, thereby enabling the output voltage of the DC-DC converter module to respond quickly and stabilize to adapt to load transients. The DC-DC conversion circuit provided in this invention rapidly adjusts the output voltage by introducing an additional charging / discharging path. Compared to existing solutions that change the internal switching frequency and inductance value of the DC-DC converter module, it is not limited by the inductor current slope and can significantly improve the load transient response speed under load transients of varying magnitudes, achieving rapid load transient response.

[0047] Optionally, Figure 3This is a schematic diagram of another DC-DC conversion circuit provided in an embodiment of the present invention. Based on the above embodiments, see... Figure 3 The DC-DC conversion module 100 includes: a DC-DC conversion unit 110, an energy storage unit 120, and an error detection unit 130; the output terminal of the DC-DC conversion unit 110 is connected to the first input terminal of the error detection unit 130, and the second input terminal of the error detection unit 130 is connected to a reference voltage V. ref The output terminal of the error detection unit 130 is connected to the input terminal of the transient detection module 200; the error detection unit 130 is used to detect the reference voltage V. ref The voltage V at the output terminal of the DC-DC converter unit out Output voltage error signal V EA The first end of the energy storage unit 120 is connected to the output end of the DC-DC conversion unit 110, and the second end is grounded.

[0048] Specifically, the DC-DC conversion unit 110 can be a DC-DC converter that can convert the voltage input from the DC voltage source Vin at the input terminal into V. out The output is then sent to the load R. The first input terminal of the error detection unit 130 can be connected to the output terminal of the DC-DC conversion unit 110, that is, the first input terminal of the error detection unit 130 is connected to one end of the load R to receive the voltage V from the output terminal. out The change; the second input terminal of the error detection unit 130 is connected to the reference voltage V. ref The error detection unit 130 can be an error amplifier, capable of detecting based on the reference voltage V. ref and the voltage V at the output terminal out Generate voltage error signal V EA Error signal V EA It can be based on the output voltage V out The voltage changes in real time according to the load R. The energy storage unit 120 can be a capacitor C, with one end connected to the load R and the other end grounded. The voltage regulator module 300 can adjust the output voltage V by charging and discharging the capacitor C. out To adapt to transient changes in load R.

[0049] Optionally, Figure 4 This is a schematic diagram of another DC-DC conversion circuit provided in an embodiment of the present invention. Based on the above embodiments, see... Figure 4 The transient detection module 200 also includes a first threshold input terminal and a second threshold input terminal, with the first threshold input terminal connected to a first threshold voltage V. H The second threshold input terminal is connected to the second threshold voltage V. L The transient detection module 200 is used to detect voltage error signals V. EAVoltage greater than the first threshold voltage V H At that time, a charging control signal TRAN_UP is generated; at the voltage error signal V EA Less than the second threshold voltage V L At that time, the discharge control signal TRAN_DOWN is generated.

[0050] Specifically, the transient detection module 200 can be a voltage comparator, and the transient detection module 200 can detect the voltage error signal V. EA With the first threshold voltage V H With the second threshold voltage V L The comparison is used to determine whether the load R experiences a transient positive transition or a transient reverse transition. First threshold voltage V H With the second threshold voltage V L It is a fixed voltage, where the first threshold voltage V H It can be the voltage error signal V when the load R is in a steady state. EA The first threshold voltage V is obtained by adding a certain offset based on the base voltage. H Second threshold voltage V L It can be the voltage error signal V when the load R is in a steady state. EA Based on this, a certain offset is reduced to obtain the second threshold voltage V. L The transient positive jump in load R can be understood as the current I in the branch containing load R. O A sharp increase in load R, resulting in a transient reverse jump, can be understood as the current I in the branch containing load R increasing rapidly. O The voltage decreases sharply. When the load R undergoes a positive jump, the output voltage V... out It will decrease sharply, at which point the voltage error signal V EA Will follow V out The error signal V increases as the error decreases. EA Increase and exceed the first threshold voltage V H When the transient detection module 200 generates a charging control signal TRAN_UP, it controls the voltage regulator module 300 to charge the energy storage unit 120 to adapt to the transient positive transition of the load R; when the load R undergoes a reverse transition, the output voltage V out It will increase sharply, at which point the voltage error signal V EA Will follow V out The error signal V decreases as the value increases. EA Decrease and fall below the second threshold voltage V L At this time, the transient detection module 200 can generate a discharge control signal TRAN_DOWN to control the voltage regulator module 300 to discharge the energy storage unit 120 to adapt to the transient reverse jump of the load R.

[0051] Optionally, Figure 5This is a schematic diagram of another DC-DC conversion circuit provided in an embodiment of the present invention. Based on the above embodiments, see... Figure 5 The voltage regulator module 300 includes a charging voltage regulator unit 310 and a discharging voltage regulator unit 320. The first terminal of the charging voltage regulator unit 310 is connected to the power supply VDD, the second terminal of the charging voltage regulator unit 310 is connected to the first terminal of the energy storage unit 120, and the control terminal of the charging voltage regulator unit 310 is connected to the first output terminal of the transient detection module 200. The first terminal of the discharging voltage regulator unit 320 is connected to the first terminal of the energy storage unit 120, the second terminal of the discharging voltage regulator unit 320 is grounded, and the control terminal of the discharging voltage regulator unit 320 is connected to the second output terminal of the transient detection module 200.

[0052] Specifically, the voltage regulator module 300 can be composed of two parts: a charging voltage regulator unit 310 and a discharging voltage regulator unit 320. When the load R undergoes a positive transition, the transient detection module 200 can generate a charging control signal TRAN_UP. At this time, the charging voltage regulator unit 310 is turned on, the discharging voltage regulator unit 320 is turned off, and the power supply VDD and the first terminal of the energy storage unit 120 are connected to charge the energy storage unit 120, thereby adjusting the output voltage V. out This allows it to adapt to the transient positive transition of the load R. When the load R experiences a reverse transition, the transient detection module 200 can generate a discharge control signal TRAN_DOWN. At this time, the charging voltage regulator unit 310 is disconnected, the discharging voltage regulator unit 320 is turned on, and the first terminal of the energy storage unit 120 is grounded through the discharging voltage regulator unit 320 to discharge, thereby adjusting the output voltage V. out This allows for adaptation to transient reverse switching of the load R. The technical solution provided in this embodiment introduces additional charging / discharging paths at the output terminal through a charging and discharging voltage regulation unit and a discharging voltage regulation unit to quickly adjust the output voltage, breaking through the inductor current slope limitation and achieving rapid load transient response.

[0053] Optionally, Figure 6 This is a schematic diagram of another DC-DC conversion circuit provided in an embodiment of the present invention. Figure 7 This is a signal timing diagram of a DC-DC conversion circuit provided in an embodiment of the present invention. Based on the above embodiment, see [link to embodiment]. Figure 5 , Figure 6 and Figure 7The transient detection module 200 includes multiple first output terminals; the charging voltage regulator unit 310 includes multiple charging units 311 connected in parallel; the first terminal of the multiple charging units 311 is connected to the power supply VDD, the second terminal of the multiple charging units 311 is connected to the first terminal of the energy storage unit 120, and the control terminals of the multiple charging units 311 are respectively connected to the multiple first output terminals of the transient detection module 200; the charging voltage regulator unit 310 is used to control the multiple charging units 311 to charge the energy storage unit 120 in sequence according to the charging control signal TRAN_UP.

[0054] Specifically, multiple charging units 311 can be connected in parallel between the power supply VDD and the first terminal of the energy storage unit 120, and the control terminals of the multiple charging units 311 are respectively connected to multiple first output terminals of the transient detection module 200. It can be understood that each charging unit 311 corresponds one-to-one with a single first output terminal of the transient detection module 200. For example, as... Figure 6 As shown, this embodiment sets up N charging units 311. During a positive transition in the load R, the transient detection module 200 counts the voltage error signal V. EA Exceeding the first threshold voltage V H The charging control signal TRAN_UP<1:N> is sent to the charging unit 311 in sequence, thereby charging the energy storage unit 120 through multiple charging units 311 in sequence until the voltage error signal V is received. EA No longer exceeding the first threshold voltage V H At this time, it is assumed that the output voltage V out It has already adapted to the transient positive jump of load R. For example... Figure 7 As shown, the example is a positive jump in load R. Where I... L The current in the inductor L within the DC-DC converter unit 110 is the current I in the branch where the load R is located when the load R undergoes a positive switching. O As it gradually increases, the output voltage V out The voltage error signal V will decrease sharply. EA Will follow V out The error signal V increases as the quantity decreases, and is detected by the transient detection module 200. EA Exceeding the first threshold voltage V H At that time, the transient detection module 200 can generate a charging control signal TRAN_UP. <1> The corresponding charging regulator unit 310 is turned on, and the corresponding on-current is I. p<1> The charging voltage regulator unit 310 charges the energy storage unit 120 to make the output voltage V... out Rise rapidly, then V EA Drop below V H The current I in the branch containing the load R O As it continues to rise, the error signal VEA It will exceed the first threshold voltage V again. H The transient detection module 200 can generate a charging control signal TRAN_UP. <2> The corresponding charging regulator unit 310 is turned on, and the corresponding on-current is I. p<2> The energy storage unit 120 continues to charge, further increasing the output voltage V. out V EA Below V H And it will no longer be higher than V before the transient ends. H Therefore, TRAN_UP<3:N> are all low, and the current IP<3:N> are all 0. After the load transient ends, the charging unit 311 is slowly turned off after a certain delay, and then the inductor current I... L Slowly rise to the load current I O V OUT and V EA The voltage gradually approaches a stable value, thus preventing a significant undershoot in the output voltage after the transient ends.

[0055] Optionally, based on the above embodiments, see below. Figure 6 The charging unit 311 includes a first switching unit 3111 and a first driving unit 3112; one end of the first switching unit 3111 is connected to the power supply VDD, and the other end is connected to the first end of the energy storage unit 120; the input end of the first driving unit 3112 is connected to the first output end of the transient detection module 200, and the output end of the first driving unit 3112 is connected to the control end of the first switching unit 3111.

[0056] Specifically, the first switching unit 3111 can be a PMOS, and the first driving unit 3112 can be a driving BUF circuit. During the transient positive transition of the load R, TRAN_UP <1> When the signal is high, the first charging unit 311 is turned on, generating a current I. P<1> Charging capacitor C, TRAN_UP <2> When the signal is high, the second charging unit 311 is activated to charge the load capacitor, and so on, until the transient switching requirements of the load are met. The number N of charging units 311 can be determined by the maximum load current capability of the circuit design and the charging capability of a single charging unit, thereby dynamically matching transient switching requirements of different amplitudes.

[0057] Optionally, based on the above embodiments, see below. Figure 6The transient detection module 200 includes multiple second output terminals; the discharge voltage regulator unit 320 includes multiple discharge units 321 connected in parallel; the first terminal of the multiple discharge units 321 is grounded, the second terminal of the multiple discharge units 321 is connected to the first terminal of the energy storage unit 120, and the control terminals of the multiple discharge units 321 are respectively connected to the multiple second output terminals of the transient detection module 200; the discharge voltage regulator unit 320 is used to control the multiple discharge units 321 to discharge to the energy storage unit 120 according to the discharge control signal.

[0058] Specifically, multiple discharge units 321 can be connected in parallel between the first terminal of the energy storage unit 120 and ground, and the control terminals of the multiple discharge units 321 are respectively connected to multiple second output terminals of the transient detection module 200. It can be understood that each discharge unit 321 corresponds one-to-one with a different second output terminal of the transient detection module 200. For example, as... Figure 6 As shown, this embodiment sets up N discharge units 321. During the reverse transition of the load R, the transient detection module 200 counts the voltage error signal V. EA Below the second threshold voltage V L The discharge control signal TRAN_DOWN<1:N> is sent to the discharge unit 321 in sequence, thereby discharging the energy storage unit 120 through the discharge unit 321 in sequence until the voltage error signal V is received. EA No longer below the second threshold voltage V L At this time, it is assumed that the output voltage V out It has been adapted to the transient reverse transition of load R.

[0059] Optionally, based on the above embodiments, see below. Figure 6 The discharge unit 321 includes a second switch unit 3211 and a second drive unit 3212; one end of the second switch unit 3211 is grounded and the other end is connected to the first end of the energy storage unit 120; the input end of the second drive unit 3212 is connected to the second output end of the transient detection module 200; and the output end of the second drive unit 3212 is connected to the control end of the second switch unit 3211.

[0060] Specifically, the second switching unit 3211 can be an NMOS, and the second switching unit 3211 can be a drive BUF circuit. During the transient reverse transition of the load R, TRAN_DOWN <1> When the level is high, the first discharge unit 321 is turned on, generating current I. N<1>When capacitor C is charged, TRAN_ DOWN <2> When the signal is high, the second charging unit 311 is activated to charge the load capacitor, and so on, until the transient switching requirements of the load are met. The number N of the discharge units 321 can be determined by the maximum load current capability of the circuit design and the discharge capability of a single discharge unit, thereby dynamically matching transient switching requirements of different amplitudes.

[0061] Figure 8 This is a flowchart illustrating a fast load transient response method for DC-DC conversion provided in an embodiment of the present invention. The fast load transient response method for DC-DC conversion provided in this embodiment can be executed by a DC-DC conversion circuit provided in any embodiment of the present invention. The fast load transient response method for DC-DC conversion includes:

[0062] S110. Obtain the voltage at the output terminal of the DC-DC converter module;

[0063] Specifically, the output terminal of the DC-DC conversion unit is connected to the first input terminal of the error detection unit, thereby transmitting the voltage at the output terminal of the DC-DC conversion module to the error detection unit.

[0064] S120. Output a voltage error signal based on the reference voltage and the voltage at the output terminal of the DC-DC converter module;

[0065] Specifically, the second input terminal of the error detection unit can be connected to a reference voltage, and the error detection unit outputs a voltage error signal based on the reference voltage and the voltage at the output terminal of the DC-DC conversion unit.

[0066] S130. Generate a charge / discharge control signal based on the voltage error signal;

[0067] Specifically, the transient detection module can compare the voltage error signal with the first threshold voltage and the second threshold voltage to determine whether the load is experiencing a transient positive jump or a transient reverse jump; and generate a charging control signal when the error signal exceeds the first threshold voltage; and generate a discharging control signal when the error signal is below the second threshold voltage.

[0068] S140. Charge or discharge the output terminal of the DC-DC converter module according to the charge / discharge control signal.

[0069] Specifically, the charging voltage regulator unit sequentially activates different charging units to charge the capacitor according to the sequentially arriving charging control signals; the discharging voltage regulator unit sequentially activates different discharging units to discharge the capacitor according to the sequentially arriving discharging control signals.

[0070] The present invention also provides a DC-DC converter with fast load transient response, including the DC-DC converter circuit provided in any embodiment of the present invention, and has the same beneficial effects as the DC-DC converter circuit provided in any embodiment of the present invention, which will not be described in detail here.

[0071] It should be understood that the various forms of processes shown above can be used, with steps reordered, added, or deleted. For example, the steps described in this invention can be executed in parallel, sequentially, or in different orders, as long as the desired result of the technical solution of this invention can be achieved, and no limitation is imposed herein.

[0072] The specific embodiments described above do not constitute a limitation on the scope of protection of this invention. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A DC-DC converter circuit, characterized in that, include: DC-DC conversion module, transient detection module, and voltage regulator module; The output terminal of the DC-DC converter module is connected to the load; the DC-DC converter module also includes an output voltage feedback terminal, which is used to feedback the error of the voltage at the output terminal; The first input terminal of the transient detection module is connected to the output voltage feedback terminal of the DC-DC conversion module, the output terminal of the transient detection module is connected to the control terminal of the voltage regulator module, and the charging and discharging terminal of the voltage regulator module is connected to the output terminal of the DC-DC conversion module. The transient detection module is used to generate a charge / discharge control signal based on the voltage error signal output by the DC-DC converter module, and the voltage regulator module is used to charge or discharge the output terminal of the DC-DC converter module based on the charge / discharge control signal. The DC-DC conversion module includes: a DC-DC conversion unit, an energy storage unit, and an error detection unit; The output terminal of the DC-DC converter is connected to the first input terminal of the error detection unit, the second input terminal of the error detection unit is connected to a reference voltage, and the output terminal of the error detection unit is connected to the input terminal of the transient detection module; the error detection unit is used to output a voltage error signal based on the reference voltage and the voltage at the output terminal of the DC-DC converter. The first end of the energy storage unit is connected to the output end of the DC-DC conversion unit, and the second end is grounded. The voltage regulator module includes a charging voltage regulator unit and a discharging voltage regulator unit; The first terminal of the charging voltage regulator unit is connected to the power supply, the second terminal of the charging voltage regulator unit is connected to the first terminal of the energy storage unit, and the control terminal of the charging voltage regulator unit is connected to the first output terminal of the transient detection module. The first terminal of the discharge voltage regulator unit is connected to the first terminal of the energy storage unit, the second terminal of the discharge voltage regulator unit is grounded, and the control terminal of the discharge voltage regulator unit is connected to the second output terminal of the transient detection module. The transient detection module includes multiple first output terminals; the charging voltage regulation unit includes multiple charging units connected in parallel. The first end of each of the multiple charging units is connected to a power source, the second end of each of the multiple charging units is connected to the first end of the energy storage unit, and the control terminals of each of the multiple charging units are respectively connected to the multiple first output terminals of the transient detection module; the charging voltage regulator unit is used to control the multiple charging units to charge the energy storage unit sequentially according to the charging control signal. The transient detection module includes multiple second output terminals; the discharge voltage regulation unit includes multiple discharge units connected in parallel. The first terminals of the plurality of discharge units are grounded, the second terminals of the plurality of discharge units are connected to the first terminal of the energy storage unit, and the control terminals of the plurality of discharge units are respectively connected to the plurality of second output terminals of the transient detection module; the discharge voltage regulation unit is used to control the plurality of discharge units to discharge to the energy storage unit according to the discharge control signal; The charging unit includes a first switching unit and a first driving unit; One end of the first switching unit is connected to the power supply, and the other end is connected to the first end of the energy storage unit. The input end of the first driving unit is connected to the first output end of the transient detection module, and the output end of the first driving unit is connected to the control end of the first switching unit. The discharge unit includes a second switching unit and a second driving unit; One end of the second switching unit is grounded, and the other end is connected to the first end of the energy storage unit. The input end of the second driving unit is connected to the second output end of the transient detection module, and the output end of the second driving unit is connected to the control end of the second switching unit.

2. The DC-DC conversion circuit according to claim 1, characterized in that, The transient detection module further includes a first threshold input terminal and a second threshold input terminal, wherein the first threshold input terminal is connected to a first threshold voltage and the second threshold input terminal is connected to a second threshold voltage; the transient detection module is used to generate a charging control signal when the voltage error signal is greater than the first threshold voltage; When the voltage error signal is less than the second threshold voltage, a discharge control signal is generated.

3. A fast load transient response method, executed using the DC-DC conversion circuit according to any one of claims 1-2, the fast load transient response method comprising: Obtain the voltage at the output terminal of the DC-DC converter module; The voltage error signal is output based on the reference voltage and the voltage at the output terminal of the DC-DC conversion module; A charge / discharge control signal is generated based on the voltage error signal; The output terminal of the DC-DC converter module is charged or discharged according to the charge / discharge control signal.

4. A DC-DC converter, characterized in that, Includes the DC-DC conversion circuit described in any one of claims 1-2.

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