Voltage conversion circuit

Abstract

This invention discloses a voltage conversion circuit, relating to the field of switching power supply technology. The voltage conversion circuit includes: an energy storage module, a first switching module, a voltage control module, a second switching module, a third switching module, and a main control module. The first switching module, based on a charging control signal sent by the main control module, causes the energy storage module to charge. The first switching module, based on a discharging control signal sent by the main control module, causes the charged energy storage module to discharge, thereby generating a boost signal. The second switching module, based on a voltage regulation control signal sent by the main control module, causes the voltage control module to regulate the boost signal and generate a target output signal. Finally, the third switching module is turned on according to an output control signal to send the target output signal to the load. This embodiment of the voltage conversion circuit improves voltage regulation capability when there are large variations between the input and output voltages.

Description

Technical Field

[0001] This invention relates to the field of switching power supply technology, and in particular to a voltage conversion circuit. Background Technology

[0002] Currently, DC power converters require large-scale off-chip inductors to reduce output ripple in switching power supplies when high voltage conversion ratios are achieved, which increases the size and manufacturing cost of the power converters.

[0003] In related technologies, DC power converters employ switched-capacitor converters and hybrid converters based on capacitor converters to reduce the size and manufacturing cost issues caused by the large footprint of off-chip inductors. However, since the efficiency of switched capacitors in these methods is still limited by the equivalent output resistance, the power converter struggles to achieve voltage regulation when there are significant variations between the input and output voltages. Therefore, providing a voltage conversion circuit to improve voltage regulation under conditions of large input and output voltage variations has become a pressing technical problem. Summary of the Invention

[0004] The present invention aims to at least solve one of the technical problems existing in the prior art. To this end, the present invention proposes a voltage conversion circuit that can improve the voltage regulation capability when there are large variations between the input voltage and the output voltage.

[0005] A voltage conversion circuit according to a first aspect embodiment of the present invention includes:

[0006] An energy storage module, one end of which is electrically connected to an external power source; wherein the external power source is used to provide a charging signal;

[0007] The first switch module is used to connect to the energy storage module and the ground terminal respectively;

[0008] A voltage control module, wherein the voltage control module is electrically connected to the first switch module;

[0009] The second switching module is used to be electrically connected to the voltage control module and the first switching module respectively. The working state of the second switching module includes a voltage regulation control state.

[0010] The third switch module is used to be electrically connected to the voltage control module and the load respectively;

[0011] The main control module is electrically connected to the first switch module, the second switch module, and the third switch module respectively, and is used to generate charging control signal, discharging control signal, voltage regulation control signal, and output control signal respectively.

[0012] The first switching module is configured to switch to a charging on state according to the charging control signal, so that the energy storage module performs a charging operation according to the charging signal; the first switching module is configured to switch to a discharging on state according to the discharging control signal, so that the energy storage module generates a boost signal after the charging operation; the second switching module is configured to switch to a voltage regulation on state according to the voltage regulation control signal, so that the voltage control module generates a target output signal according to the boost signal; and the third switching module is configured to turn on according to the output control signal, so as to send the target output signal to the load.

[0013] The voltage conversion circuit according to an embodiment of the present invention has at least the following beneficial effects: The first switching module causes the energy storage module to perform a charging operation according to the charging control signal sent by the main control module. The first switching module causes the fully charged energy storage module to perform a discharging operation according to the discharging control signal sent by the main control module, thereby generating a boost signal from the energy storage module, which then boosts the voltage of the voltage control module. The second switching module causes the voltage control module to regulate the boost signal according to the voltage regulation control signal sent by the main control module, and generates a target output signal. Finally, the third switching module is turned on according to the output control signal to send the target output signal to the load. The voltage conversion circuit of this embodiment can achieve boost conversion by discharging the voltage control module from the energy storage module, and utilizes the first and second switching modules to regulate the boost signal stored in the voltage control module, thereby improving the voltage regulation capability when there are large changes between the input and output voltages.

[0014] According to some embodiments of the present invention, the voltage control module includes:

[0015] A first capacitor, one end of which is used for electrical connection with a first switching module, and the other end of which is used for electrical connection with a second switching module;

[0016] The second capacitor has one end for electrical connection to one end of the first switch module and one end of the second switch module, and the other end for electrical connection to the other end of the second switch module.

[0017] The third capacitor has one end for electrical connection to one end of the first switch module and one end of the second switch module, and the other end for electrical connection to the other end of the second switch module and the third switch module.

[0018] According to some embodiments of the present invention, the energy storage module includes:

[0019] An inductor, one end of which is used for electrical connection to the external power supply, and the other end of which is used for electrical connection to the first switch module.

[0020] According to some embodiments of the present invention, the main control module includes:

[0021] An edge limiting unit is provided, which is electrically connected to the connection node of the third switching module and the load. The edge limiting unit is used to perform edge limiting operation according to the target output signal to obtain a feedback signal.

[0022] A duty cycle adjustment unit is provided, which is electrically connected to the edge limiting unit and the clock signal source respectively; wherein, the clock signal source is used to provide a clock signal, and the duty cycle adjustment unit is used to adjust the duty cycle of the feedback signal according to the clock signal to obtain a modulation signal;

[0023] The driving unit is electrically connected to the duty cycle adjustment unit, the first switch module, the second switch module, and the third switch module, respectively. The driving unit is used to generate the charging control signal, the discharging control signal, the voltage regulation control signal, and the output control signal according to the modulation signal.

[0024] According to some embodiments of the present invention, the duty cycle adjustment unit includes:

[0025] A first ramp generator is used to be electrically connected to the clock signal source. The first ramp generator is used to detect the rising edge of the clock signal and generate a first ramp signal.

[0026] A first comparator, wherein a first input terminal of the first comparator is electrically connected to the edge limiting unit, a second input terminal of the first comparator is electrically connected to the first ramp generator, and an output terminal of the first comparator is electrically connected to the driving unit, and the first comparator is used to generate a first square wave signal based on the feedback signal and the first ramp signal;

[0027] A second ramp generator is used to electrically connect to the output of the first comparator. The second ramp generator is used to detect the falling edge of the first square wave signal and generate a second ramp signal.

[0028] The second comparator has a first input terminal electrically connected to the edge limiting unit, a second input terminal electrically connected to the second ramp generator, and an output terminal electrically connected to the driving unit. The second comparator is used to generate a second square wave signal based on the feedback signal and the second ramp signal.

[0029] A third ramp generator is used to electrically connect to the output of the second comparator. The third ramp generator is used to detect the falling edge of the second square wave signal and generate a third ramp signal.

[0030] A third comparator has a first input terminal electrically connected to the edge limiting unit, a second input terminal electrically connected to the third ramp generator, and an output terminal electrically connected to the driving unit. This third comparator is used to generate a third ramp signal based on the feedback signal and the second ramp signal.

[0031] The driving unit is used to generate the charging control signal, the discharging control signal, the voltage regulation control signal, and the output control signal based on the first square wave signal, the second square wave signal, and the third square wave signal.

[0032] According to some embodiments of the present invention, the first switching module includes:

[0033] A first switching unit is configured to be electrically connected to one end of the first capacitor, the external power supply, the main control module, and ground, respectively. The first switching unit is configured to control the connection state between the external power supply and the first capacitor according to the charging control signal and the discharging control signal.

[0034] The second switching unit is used to be electrically connected to one end of the second capacitor, the inductor, the main control module, and the ground terminal respectively. The second switching unit is used to switch to a first charging conduction state according to the charging control signal so that the inductor performs a charging operation according to the charging signal. The second switching unit is also used to switch to a first discharging conduction state according to the discharging control signal so that the inductor generates a boost signal after the charging operation.

[0035] The third switching unit is used to connect to one end of the third capacitor, the external power supply, the main control module, and the ground terminal respectively. The third switching unit is used to control the connection state between the external power supply and the third capacitor according to the charging control signal and the discharging control signal.

[0036] According to some embodiments of the present invention, the second switching module includes:

[0037] The fourth switching unit has a first terminal for electrically connecting to one end of the first capacitor, a second terminal for electrically connecting to one end of the second capacitor, and a third terminal for electrically connecting to the other end of the second capacitor and the second switching unit, respectively. The fourth switching unit is used to switch to a voltage-regulated on state according to the voltage regulation control signal.

[0038] The fifth switching unit has a first terminal for electrical connection to the connection node of the second capacitor and the fourth switching unit, a second terminal for electrical connection to the connection node of the third capacitor and the third switching module, and a third terminal for electrical connection to the connection node of the third capacitor and the third switching unit. The fifth switching unit is used to switch to a voltage-regulated on state according to the voltage regulation control signal, so that the first capacitor, the second capacitor, and the third capacitor generate the target output signal according to the boost signal.

[0039] According to some embodiments of the present invention, the first switching unit includes:

[0040] The first voltage-controlled current element has its source electrically connected to the external power supply, its drain electrically connected to the first capacitor, and its gate electrically connected to the main control module.

[0041] The second voltage-controlled current element has its source electrically connected to ground, its drain electrically connected to the connection node of the first capacitor and the first voltage-controlled current element, and its gate electrically connected to the main control module.

[0042] The second switching unit includes:

[0043] The third voltage-controlled current element has its source electrically connected to ground, its drain electrically connected to the inductor, and its gate electrically connected to the main control module.

[0044] The fourth voltage-controlled current element has its source electrically connected to the connection node of the inductor and the third voltage-controlled current element, its drain electrically connected to the second capacitor, and its gate electrically connected to the main control module.

[0045] The third switching unit includes:

[0046] The fifth voltage-controlled current element, wherein the source of the fifth voltage-controlled current element is used to be electrically connected to the external power supply, and the gate of the fifth voltage-controlled current element is used to be electrically connected to the main control module;

[0047] The sixth voltage-controlled current element has its source electrically connected to the drain of the fifth voltage-controlled current element, its drain electrically connected to the third capacitor, and its gate electrically connected to the main control module.

[0048] The seventh voltage-controlled current element has its source electrically connected to ground, its drain electrically connected to the connection node of the third capacitor and the sixth voltage-controlled current element, and its gate electrically connected to the main control module.

[0049] According to some embodiments of the present invention, the fourth switching unit includes:

[0050] The eighth voltage-controlled current element has its source electrically connected to the first capacitor, its drain electrically connected to the second capacitor, and its gate electrically connected to the main control module.

[0051] The ninth voltage-controlled current element has its source electrically connected to the connection node of the second capacitor and the fourth voltage-controlled current element, its drain electrically connected to the connection node of the first capacitor and the eighth voltage-controlled current element, and its gate electrically connected to the main control module.

[0052] The fifth switching unit includes:

[0053] The tenth voltage-controlled current element has its source electrically connected to the connection node of the second capacitor and the eighth voltage-controlled current element, its drain electrically connected to the connection node of the third capacitor and the third switching module, and its gate electrically connected to the main control module.

[0054] The eleventh voltage-controlled current element has its source electrically connected to the connection node of the third capacitor and the seventh voltage-controlled current element, its drain electrically connected to the connection node of the second capacitor and the tenth voltage-controlled current element, and its gate electrically connected to the main control module.

[0055] According to some embodiments of the present invention, the first voltage-controlled current element and the fifth voltage-controlled current element are P-type field-effect transistors, and the second voltage-controlled current element, the third voltage-controlled current element, the fourth voltage-controlled current element, the sixth voltage-controlled current element, the seventh voltage-controlled current element, the eighth voltage-controlled current element, the ninth voltage-controlled current element, the tenth voltage-controlled current element, and the eleventh voltage-controlled current element are all N-type field-effect transistors.

[0056] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0057] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0058] Figure 1 This is a module block diagram of a specific embodiment of the voltage conversion circuit of the present invention;

[0059] Figure 2 This is a circuit schematic diagram of a first specific embodiment of the voltage conversion circuit of the present invention;

[0060] Figure 3 This is a circuit schematic diagram of a second specific embodiment of the voltage conversion circuit of the present invention;

[0061] Figure 4 This is a circuit diagram of a specific embodiment of the duty cycle adjustment unit of the present invention;

[0062] Figure 5 The above are waveform diagrams of relevant signals processed by the duty cycle adjustment unit in an embodiment of the present invention.

[0063] Figure 6 The above are waveform diagrams of the first square wave signal, the second square wave signal, and the third square wave signal according to an embodiment of the present invention.

[0064] Figure 7 This is a circuit topology diagram of the first control stage in an embodiment of the present invention;

[0065] Figure 8 This is a circuit topology diagram of the second control stage in an embodiment of the present invention;

[0066] Figure 9 This is a circuit topology diagram of the third control stage in an embodiment of the present invention;

[0067] Figure 10 This is a circuit topology diagram of the fourth control stage in an embodiment of the present invention.

[0068] Figure label:

[0069] Energy storage module 100, first switch module 200, first switch unit 210, second switch unit 220, third switch unit 230, voltage control module 300, second switch module 400, fourth switch unit 410, fifth switch unit 420, third switch module 500, main control module 600, compensation unit 610, edge limiting unit 620, duty cycle adjustment unit 630, drive unit 640, external power supply 700, load 800. Detailed Implementation

[0070] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0071] In the description of this invention, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0072] In the description of this invention, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0073] In the description of this invention, unless otherwise explicitly defined, terms such as "set up," "install," and "connect" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.

[0074] In the description of this invention, the terms "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0075] Currently, DC power converters require large-scale off-chip inductors to reduce output ripple in switching power supplies when the voltage conversion ratio is high (e.g., voltage conversion ratio greater than 10), which increases the size and manufacturing cost of the power converter.

[0076] In related technologies, DC power converters employ switched-capacitor converters and hybrid converters based on capacitor converters to reduce the size and manufacturing cost issues caused by the large footprint of off-chip inductors. However, since the efficiency of switched capacitors in these methods is still limited by the equivalent output resistance, the power converter struggles to achieve voltage regulation when there are significant variations between the input and output voltages. Therefore, providing a voltage conversion circuit to improve voltage regulation under conditions of large input and output voltage variations has become a pressing technical problem.

[0077] Based on this, embodiments of the present disclosure provide a voltage conversion circuit that can improve the voltage regulation capability when there are large variations between the input voltage and the output voltage.

[0078] like Figure 1 As shown, this embodiment of the invention provides a voltage conversion circuit, which includes: an energy storage module 100, a first switching module 200, a voltage control module 300, a second switching module 400, a third switching module 500, and a main control module 600. One end of the energy storage module 100 is electrically connected to an external power supply 700; wherein, the external power supply 700 is used to provide a charging signal; the first switching module 200 is electrically connected to the energy storage module 100 and ground respectively; the voltage control module 300 is electrically connected to the first switching module 200; the second switching module 400 is electrically connected to the voltage control module 300 and the first switching module 200 respectively, and the second switching module 400 has a voltage regulation control state; the third switching module 500 is electrically connected to the voltage control module 300 and a load 800 respectively; the main control module 600 is electrically connected to the first switching module 200, the second switching module 400, and the third switching module 500 respectively. Block 600 is used to generate charging control signals, discharging control signals, voltage regulation control signals, and output control signals respectively; wherein, the first switch module 200 is used to switch to the charging conduction state according to the charging control signal, so that the energy storage module 100 performs a charging operation according to the charging signal; the first switch module 200 is used to switch to the discharging conduction state according to the discharging control signal, so that the energy storage module 100 generates a boost signal after the charging operation; the second switch module 400 is used to switch to the voltage regulation conduction state according to the voltage regulation control signal, so that the voltage control module 300 generates a target output signal according to the boost signal; the third switch module 500 is used to conduct according to the output control signal, so as to send the target output signal to the load 800.

[0079] Specifically, the external power supply 700 is a DC power supply, meaning the charging signal provided by the external power supply 700 is a DC signal. The load 800 includes a device to be powered, which operates using a DC signal. The external power supply 700 is electrically connected to the energy storage module 100 and the first switch module 200, respectively. The energy storage module 100 is electrically connected to the first switch module 200. The voltage control module 300 is electrically connected to the first switch module 200, the second switch module 400, and the third switch module 500, respectively. The first switch module 200, the second switch module 400, and the third switch module 500 are all electrically connected to the main control module 600.

[0080] The main control module 600 sequentially generates charging control signals and discharging control signals at preset time intervals. The first switch module 200 first receives the charging control signal and switches to a charging-on state based on it. In the charging-on state, the first switch module 200 enables the external power supply 700, energy storage module 100, and ground to form a current loop, allowing the energy storage module 100 to perform charging operations according to the charging signal. Since the main control module 600 continuously generates charging control signals during the aforementioned time intervals before generating the discharging control signal, the energy storage module 100 can maintain charging operations during these time intervals. After the aforementioned time intervals, the main control module 600 switches to generating a discharging control signal. The first switch module 200 then receives the discharging control signal and switches to a discharging-on state based on it. In the discharging-on state, the first switch module 200 enables the external power supply 700, energy storage module 100, voltage control module 300, and ground to form a current loop. At this time, the energy storage module 100 can release the stored electrical energy after charging to the voltage control module 300, that is, the energy storage module 100 can send a boost signal to the voltage control module 300, thereby enabling the voltage control module 300 to boost the voltage.

[0081] The main control module 600 is also used to generate a voltage regulation control signal and an output control signal, respectively. The second switch module 400 receives the voltage regulation control signal and switches to a voltage regulation on state according to the voltage regulation control signal. In the voltage regulation on state, the second switch module 400 enables the voltage control module 300 to perform voltage regulation on the boost signal, thereby enabling the voltage control module 300 to generate a voltage-stable target output signal. After the voltage control module 300 generates the voltage-stable target output signal, the main control module 600 sends an output control signal to the third switch module 500. Upon receiving the output control signal, the third switch module 500 turns on, forming a current loop between the voltage control module 300 and the load 800, thereby enabling the voltage control module 300 to send the target output signal to the load 800.

[0082] Understandably, when the main control module 600 generates a charging control signal, it can simultaneously generate a voltage regulation control signal and an output control signal. That is, while the energy storage module 100 is charging, the voltage control module 300 can simultaneously perform voltage regulation and output the target output signal. However, when the main control module 600 generates a discharging control signal, it will not simultaneously generate the charging control signal, voltage regulation control signal, and output control signal. In other words, when the energy storage module 100 performs a voltage boost operation on the voltage control module 300, the voltage control module 300 cannot simultaneously perform voltage regulation and output the target output signal, and the energy storage module 100 cannot perform a charging operation either.

[0083] According to the voltage conversion circuit of the present invention, the voltage control module 300 can be boosted by discharging the energy storage module 100, and the boost signal stored in the voltage control module 300 can be stabilized by the first switch module 200 and the second switch module 400, thereby improving the voltage stabilization capability when there is a large change between the input voltage and the output voltage.

[0084] like Figure 2 As shown, in some specific embodiments of the present invention, the voltage control module 300 includes: a first capacitor C1, a second capacitor C2, and a third capacitor C3. One end of the first capacitor C1 is electrically connected to the first switch module 200, and the other end of the first capacitor C1 is electrically connected to the second switch module 400; one end of the second capacitor C2 is electrically connected to one end of the first switch module 200 and one end of the second switch module 400, respectively, and the other end of the second capacitor C2 is electrically connected to the other end of the second switch module 400; one end of the third capacitor C3 is electrically connected to one end of the first switch module 200 and one end of the second switch module 400, respectively, and the other end of the third capacitor C3 is electrically connected to the other end of the second switch module 400 and the third switch module 500, respectively.

[0085] Specifically, one end of the first capacitor C1, one end of the second capacitor C2, and one end of the third capacitor C3 are all electrically connected to the first switching module 200. The second switching module 400 is connected in series with the other end of the first capacitor C1, and is connected in parallel with the second capacitor C2 and the third capacitor C3, respectively. When the first switching module 200 is in the discharge-on state, the energy storage module 100 can form a current loop with at least one of the first capacitor C1, the second capacitor C2, and the third capacitor C3, thereby allowing the energy storage module 100 to discharge the capacitor in the current loop, thus increasing the voltage across the capacitor in the current loop. When the second switching module 400 is in the voltage-stabilized-on state, it enables the first capacitor C1, the second capacitor C2, and the third capacitor C3 to perform mutual charging and discharging operations, thereby achieving voltage stabilization of the boosted capacitor voltage, allowing the voltage control module 300 to generate a stable target output signal.

[0086] like Figure 2 As shown, in some specific embodiments of the present invention, the energy storage module 100 includes an inductor L. One end of the inductor L is used for electrical connection to an external power supply 700, and the other end of the inductor L is used for electrical connection to a first switching module 200.

[0087] Specifically, the external power supply 700, inductor L, and first switching module 200 are connected in series. When the first switching module 200 is in the charging-on state, the external power supply 700, inductor L, and ground form a current loop, allowing inductor L to charge according to the power supply signal provided by the external power supply 700. When the first switching module 200 is in the discharging-on state, the external power supply 700, inductor L, at least one capacitor from the voltage control module 300, and ground form a current loop. At this time, the energy storage module 100 can release the stored energy to the capacitor after charging, i.e., it can enable inductor L to send a boost signal to the capacitor in the current loop, thereby boosting the capacitor's voltage.

[0088] like Figure 3As shown, in some specific embodiments of the present invention, the main control module 600 includes: a compensation unit 610, an edge limiting unit 620, a duty cycle adjustment unit 630, and a drive unit 640. The edge limiting unit 620 is electrically connected to the connection node of the third switch module 500 and the load 800, and is used to perform edge limiting operations according to the target output signal to obtain a feedback signal. The duty cycle adjustment unit 630 is electrically connected to the edge limiting unit 620 and a clock signal source, respectively; wherein, the clock signal source is used to provide a clock signal, and the duty cycle adjustment unit 630 is used to perform duty cycle adjustment operations on the feedback signal according to the clock signal to obtain a modulation signal. The drive unit 640 is electrically connected to the duty cycle adjustment unit 630, the first switch module 200, the second switch module 400, and the third switch module 500, respectively, and is used to generate a charging control signal, a discharging control signal, a voltage regulation control signal, and an output control signal according to the modulation signal.

[0089] Specifically, the output terminal of the third switching module 500, the compensation unit 610, the edge limiting unit 620, the duty cycle adjustment unit 630, and the drive unit 640 are connected in series. The compensation unit 610 receives the target output signal from the third switching module 500 and compensates for the gain drift and zero-point drift of the target output signal, thereby improving the gain of the target output signal. The compensation unit 610 can be composed of a type 3 compensator. The edge limiting unit 620 receives the compensated target output signal and limits the rising and falling edges of the target output signal to obtain a feedback signal with the required rising and falling edges, thereby improving the accuracy of subsequent duty cycle adjustment of the feedback signal.

[0090] The duty cycle adjustment unit 630 is also electrically connected to a clock signal source, which provides a clock signal with a preset clock period. Upon receiving the feedback signal and the clock signal, the duty cycle adjustment unit 630 detects the rising edge of the clock signal and triggers a duty cycle adjustment operation on the feedback signal when the rising edge of the clock signal occurs, thereby generating a modulation signal that meets the required duty cycle. After receiving the modulation signal, the drive unit 640 generates a charging control signal, a discharging control signal, a voltage regulation control signal, and an output control signal, respectively, thereby controlling the switching of the first switch module 200, the second switch module 400, and the third switch module 500.

[0091] In one specific embodiment, refer to Figure 3The driving unit 640 may include a logic controller, a level shifter, a driver, and a bootstrap subunit. The driving unit 640 processes the modulation signal through the logic controller, level shifter, driver, and bootstrap subunit to generate a charging control signal, a discharging control signal, a voltage regulation control signal, and an output control signal, which are then sent to the first switching module 200, the second switching module 400, and the third switching module 500, respectively.

[0092] like Figure 3 , Figure 4 As shown, in some specific embodiments of the present invention, the duty cycle adjustment unit 630 includes: a first ramp generator, a first comparator, a second ramp generator, a second comparator, a third ramp generator, and a third comparator. The first ramp generator is electrically connected to a clock signal source and is used to detect the rising edge of the clock signal and generate a first ramp signal. The first input terminal of the first comparator is electrically connected to an edge limiting unit 620, the second input terminal of the first comparator is electrically connected to the first ramp generator, and the output terminal of the first comparator is electrically connected to a driving unit 640. The first comparator is used to generate a first square wave signal based on a feedback signal and the first ramp signal. The second ramp generator is electrically connected to the output terminal of the first comparator and is used to detect the falling edge of the first square wave signal and generate a second ramp signal. The first input terminal of the second comparator is electrically connected to the edge limiting unit 620, the second input terminal of the second comparator is electrically connected to the second ramp generator, and the output terminal of the second comparator is electrically connected to a driving unit 640. The output terminal is used to be electrically connected to the drive unit 640. The second comparator is used to generate a second square wave signal based on the feedback signal and the second ramp signal. The third ramp generator is used to be electrically connected to the output terminal of the second comparator. The third ramp generator is used to detect the falling edge of the second square wave signal and generate a third ramp signal. The first input terminal of the third comparator is used to be electrically connected to the edge limiting unit 620. The second input terminal of the third comparator is used to be electrically connected to the third ramp generator. The output terminal of the third comparator is used to be electrically connected to the drive unit 640. The third comparator is used to generate a third ramp signal based on the feedback signal and the second ramp signal. The drive unit 640 is used to generate a charging control signal, a discharging control signal, a voltage regulation control signal, and an output control signal based on the first square wave signal, the second square wave signal, and the third ramp signal.

[0093] Specifically, when controlling the switching of the first switch module 200, the second switch module 400, and the third switch module 500, the charging control signal, voltage regulation control signal, and output control signal generated by the main control module 600 all need to meet the conditions of the same duty cycle and continuous signal. Therefore, the duty cycle adjustment unit 630 needs to modulate a signal that meets the above conditions of the same duty cycle and continuous signal. The clock signal source, the first ramp generator, the first comparator, the second ramp generator, the second comparator, the third ramp generator, and the third comparator are connected in series in sequence. The second input terminals of the first comparator, the second comparator, and the third comparator are all electrically connected to the edge limiting unit 620, and the output terminals of the first comparator, the second comparator, and the third comparator are all electrically connected to the drive unit 640.

[0094] A first ramp generator detects the rising edge of a clock signal and generates a rising ramp when the clock signal reaches a rising edge, thus generating a first ramp signal. A first comparator receives the first ramp signal from its first input terminal and a feedback signal from its second input terminal. The first comparator compares the voltage value of the first ramp signal with the voltage value of the feedback signal. When the first comparator detects that the voltage value of the first ramp signal is less than the voltage value of the feedback signal, the first comparator outputs a high-level signal; when the first comparator detects that the voltage value of the first ramp signal is greater than the voltage value of the feedback signal, the first comparator outputs a low-level signal, thereby obtaining a first square wave signal. (Refer to...) Figure 5 Where “Clock” is the clock signal, “VP4” is the first ramp signal, “REF” is the feedback signal, and “PH4” is the first square wave signal.

[0095] The second ramp generator detects the falling edge of the first square wave signal and generates a rising ramp when the falling edge of the first square wave signal appears, thus generating the second ramp signal. The second comparator receives the second ramp signal from its first input terminal and a feedback signal from its second input terminal. The second comparator compares the voltage value of the second ramp signal with the voltage value of the feedback signal. When the second comparator detects that the voltage value of the second ramp signal is less than the voltage value of the feedback signal, the second comparator outputs a high-level signal; when the second comparator detects that the voltage value of the first ramp signal is greater than the voltage value of the feedback signal, the second comparator outputs a low-level signal, thereby obtaining the second square wave signal. (Refer to...) Figure 5 , where “VP1” is the second ramp signal and “PH1” is the second square wave signal.

[0096] The third ramp generator detects the falling edge of the second square wave signal and generates a rising ramp when the second square wave signal has a falling edge, thus generating the third ramp signal. The third comparator receives the third ramp signal from its first input and a feedback signal from its second input. The third comparator compares the voltage value of the third ramp signal with the voltage value of the feedback signal. When the third comparator detects that the voltage value of the third ramp signal is less than the voltage value of the feedback signal, the third comparator outputs a high-level signal; when the third comparator detects that the voltage value of the third ramp signal is greater than the voltage value of the feedback signal, the third comparator outputs a low-level signal, thereby obtaining the third ramp signal. (Refer to...) Figure 5 , where “VP2” is the third ramp signal and “PH2” is the third ramp signal.

[0097] Reference Figure 5 The first square wave signal, the second square wave signal, and the third square wave signal are signals with the same duty cycle and are continuous, satisfying the requirements of the charging control signal, the voltage regulation control signal, and the output control signal. These three square wave signals are the modulation signals output to the drive unit 640. After receiving the obtained first square wave signal, second square wave signal, and third square wave signal, the drive unit 640 generates the charging control signal, the voltage regulation control signal, and the output control signal based on these three square wave signals. (Refer to...) Figure 5 t01-t11 represents one clock cycle of the clock signal, which can be divided into four equal time periods: "t01-t02", "t02-t03", "t03-t04", and "t04-t11". Within this clock cycle, t01-t02 is the period when the first square wave signal PH4 is at a high level, t02-t03 is the period when the second square wave signal PH1 is at a high level, and t03-t04 is the period when the third square wave signal is at a high level. During the time period t04-t11, the drive unit 640 will not receive a high-level signal from the duty cycle adjustment unit 630. At this time, the drive unit 640 will generate a discharge control signal, that is, in the last time period of the aforementioned clock cycle, the drive unit 640 can control the first switch module 200 to switch to the discharge conduction state, so that the inductor L discharges to the voltage control module 300.

[0098] In this embodiment, the duty cycle adjustment unit 630 utilizes the target output signal output to the load 800 and combines it with the control of the clock period of the clock signal to achieve an adjustable duty cycle switching control mode. Furthermore, the three square wave signals generated can satisfy the effects of equal duty cycle, continuous signal, and non-overlapping waveforms.

[0099] Simultaneously refer to Figure 6Since the comparators and ramp generators mentioned above have signal transmission and reception delays, there is a dead time Td between two adjacent high-level signals in the first square wave signal, the second square wave signal, and the third square wave signal. That is, there is no need to set an additional delay module to generate the dead time, which can ensure the switching control accuracy of the above three switching modules, thereby simplifying the complexity of circuit design.

[0100] like Figure 2 As shown, in some specific embodiments of the present invention, the first switch module 200 includes: a first switch unit 210, a second switch unit 220, and a third switch unit 230. The first switching unit 210 is electrically connected to one end of the first capacitor C1, the external power supply 700, the main control module 600, and ground, respectively. The first switching unit 210 is used to control the connection state between the external power supply 700 and the first capacitor C1 according to the charging control signal and the discharging control signal. The second switching unit 220 is electrically connected to one end of the second capacitor C2, the inductor L, the main control module 600, and ground, respectively. The second switching unit 220 is used to switch to the first charging conduction state according to the charging control signal so that the inductor L can perform a charging operation according to the charging signal. The second switching unit 220 is used to switch to the first discharging conduction state according to the discharging control signal so that the inductor L generates a boost signal after the charging operation. The third switching unit 230 is electrically connected to one end of the third capacitor C3, the external power supply 700, the main control module 600, and ground, respectively. The third switching unit 230 is used to control the connection state between the external power supply 700 and the third capacitor C3 according to the charging control signal and the discharging control signal.

[0101] Specifically, the first capacitor C1 is electrically connected to the first switching unit 210, the second capacitor C2 is electrically connected to the second switching unit 220, and the third capacitor C3 is electrically connected to the third switching unit 230. Upon receiving a charging control signal, the second switching unit 220 connects the inductor L to ground, allowing the external power supply 700, inductor L, and ground to form a current loop, thus enabling inductor L to charge according to the charging signal provided by the external power supply 700. Upon receiving a discharging control signal, the second switching unit 220 disconnects the inductor L from ground and simultaneously connects the inductor L to the second capacitor C2, forming a current loop between them, allowing inductor L to release a boost signal to the second capacitor C2.

[0102] After receiving the charging control signal, the first switching module 200 can control the connection state of the first capacitor C1 with the external power supply 700. Combined with the main control module 600's switching control of the three capacitors in the voltage control module 300 via the voltage regulation control signal, voltage stability among the three capacitors in the voltage control module 300 can be achieved. After receiving the discharging control signal, the first switching module 200 disconnects the connection between the first capacitor C1 and the external power supply 700, and simultaneously opens the connection between the first capacitor C1 and ground, leaving the first capacitor C1 floating.

[0103] After receiving the charging control signal, the third switch module 500 can control the connection status of the third capacitor C3 with the external power supply 700 and ground, respectively. Combined with the main control module 600's switching control of the three capacitors in the voltage control module 300 via the voltage regulation control signal, voltage stability among the three capacitors in the voltage control module 300 can be achieved. After receiving the discharge control signal, the third switch module 500 disconnects the first capacitor C1 from the external power supply 700 and simultaneously opens the connection of the third capacitor C3 to ground. At this time, the external power supply 700, inductor L, second capacitor C2, third capacitor C3, and ground can form a current loop, meaning that inductor L can simultaneously release boost signals to the second capacitor C2 and the third capacitor C3.

[0104] like Figure 2 As shown, in some specific embodiments of the present invention, the second switch module 400 includes a fourth switch unit 410 and a fifth switch unit 420. The first end of the fourth switch unit 410 is electrically connected to one end of the first capacitor C1, the second end of the fourth switch unit 410 is electrically connected to one end of the second capacitor C2, and the third end of the fourth switch unit 410 is electrically connected to the other end of the second capacitor C2 and the second switch unit 220, respectively. The fourth switch unit 410 is used to switch to a voltage-regulated on state according to a voltage regulation control signal. The first end of the fifth switch unit 420 is electrically connected to the connection node between the second capacitor C2 and the fourth switch unit 410, the second end of the fifth switch unit 420 is electrically connected to the connection node between the third capacitor C3 and the third switch module 500, and the third end of the fifth switch module 500 is electrically connected to the connection node between the third capacitor C3 and the third switch unit 230. The fifth switch unit 420 is used to switch to a voltage-regulated on state according to a voltage regulation control signal, so that the first capacitor C1, the second capacitor C2, and the third capacitor C3 generate a target output signal according to a boost signal.

[0105] Specifically, the first capacitor C1 is connected in series with the fourth switching unit 410, the second capacitor C2 is connected in parallel with the fourth switching unit 410, the second capacitor C2 is connected in series with the fifth switching unit 420, and the third capacitor C3 is connected in parallel with the fifth switching unit 420. Upon receiving a voltage regulation control signal, the fourth switching unit 410 and the fifth switching unit 420 can switch to a voltage regulation on-state, allowing the three capacitors in the voltage control module 300 to charge and discharge each other, thereby achieving voltage regulation. The specific switching control logic will be described in detail below.

[0106] like Figure 2 As shown, in some specific embodiments of the present invention, the first switching unit 210 includes: a first voltage control element M1 and a second voltage control element M2; the second switching unit 220 includes: a third voltage control element M3 and a fourth voltage control element M4; and the third switching unit 230 includes: a fifth voltage control element M5 and a sixth voltage control element M6. The source of the first voltage-controlled current element M1 is electrically connected to the external power supply 700, the drain of the first voltage-controlled current element M1 is electrically connected to the first capacitor C1, and the gate of the first voltage-controlled current element M1 is electrically connected to the main control module 600; the source of the second voltage-controlled current element M2 is electrically connected to ground, the drain of the second voltage-controlled current element M2 is electrically connected to the connection node of the first capacitor C1 and the first voltage-controlled current element M1, and the gate of the second voltage-controlled current element M2 is electrically connected to the main control module 600; the source of the third voltage-controlled current element M3 is electrically connected to ground, the drain of the third voltage-controlled current element M3 is electrically connected to the inductor L, and the gate of the third voltage-controlled current element M3 is electrically connected to the main control module 600; the source of the fourth voltage-controlled current element M4 is electrically connected to the connection node of the inductor L and the third voltage-controlled current element M3, and the... The drain of the fourth voltage-controlled current element M4 is electrically connected to the second capacitor C2, and the gate of the fourth voltage-controlled current element M4 is electrically connected to the main control module 600; the source of the fifth voltage-controlled current element M5 is electrically connected to the external power supply 700, and the gate of the fifth voltage-controlled current element M5 is electrically connected to the main control module 600; the source of the sixth voltage-controlled current element M6 is electrically connected to the drain of the fifth voltage-controlled current element M5, the drain of the sixth voltage-controlled current element M6 is electrically connected to the third capacitor C3, and the gate of the sixth voltage-controlled current element M6 is electrically connected to the main control module 600; the source of the seventh voltage-controlled current element M7 is electrically connected to ground, the drain of the seventh voltage-controlled current element M7 is electrically connected to the connection node of the third capacitor C3 and the sixth voltage-controlled current element M6, and the gate of the seventh voltage-controlled current element M7 is electrically connected to the main control module 600.

[0107] Specifically, the switching control of the main control module 600 on the first switch module 200 can be divided into four cyclic control stages. Figures 7 to 10The circuit topology diagram for the four control stages is shown above. Solid lines indicate that current flows through the branch, dashed lines indicate that no current flows through the branch, and arrows indicate the direction of current.

[0108] Reference Figure 2 , Figure 7 The first control phase is the first charging phase. During this phase, the main control module 600 controls the first voltage control element M1 to turn on, the second voltage control element M2 to turn off, the third voltage control element M3 to turn on, the fourth voltage control element M4 to turn off, and the fifth, sixth, and seventh voltage control elements M5, M6, and M7 to turn off via a charging control signal. In this phase, the inductor L, the external power supply 700, and the ground terminal form a current loop, allowing the inductor L to charge according to the charging signal provided by the external power supply 700. Simultaneously, the voltage control module 300, the external power supply 700, and the load 800 also form a current loop. Since the voltage control module 300 has not yet boosted the voltage, the voltage output to the load 800 is still the initial voltage provided by the external power supply 700.

[0109] Reference Figure 2 , Figure 8 The second control stage is the second charging stage. During this stage, the main control module 600 controls the second voltage control element M2 to turn on, the first voltage control element M1 to turn off, the third voltage control element M3 to turn on, the fourth voltage control element M4 to turn off, the fifth voltage control elements M5 and the sixth voltage control element M6 to turn on, and the seventh voltage control element M7 to turn off, all via charging control signals. In this stage, the inductor L maintains the same state as in the first stage, and can perform charging operations according to the charging signal provided by the external power supply 700. Simultaneously, the voltage control module 300, the external power supply 700, and the ground terminal can form a current loop, allowing the three capacitors in the voltage control module 300 to perform preliminary voltage regulation.

[0110] Reference Figure 2 , Figure 9 The third control stage is the discharge stage. During this stage, the main control module 600 controls the second voltage control element M2 to turn on, the first voltage control element M1 to turn off, the fourth voltage control element M4 to turn on, the third voltage control element M3 to turn off, the fifth voltage control element M5 and the sixth voltage control element M6 to turn off, and the seventh voltage control element M7 to turn on, all via a discharge control signal. In this stage, the inductor L, the voltage control module 300, the external power supply 700, and the ground terminal form a current loop, allowing the inductor L to release the electrical energy stored during the previous charging operation to the voltage control module 300. In other words, the inductor L sends a boost signal to the charging control module, causing the voltage of the voltage control module 300 to increase.

[0111] Reference Figure 2 , Figure 10The fourth stage is the boost and stabilization stage. During this stage, the main control module 600 controls the first voltage control element M1 to turn on, the second voltage control element M2 to turn off, the third and fourth voltage control elements M3 and M4 to turn on, the fifth and sixth voltage control elements M5 and M6 to turn off, and the seventh voltage control element M7 to turn on, all via a charging control signal. In this stage, the inductor L maintains the same state as in the first control stage, meaning it can charge according to the charging signal provided by the external power supply 700. Simultaneously, the voltage control module 300, the external power supply 700, and ground can form a current loop. The voltage control module 300 can then stabilize the boosted voltage through mutual charging and discharging between capacitors, thereby generating a stable target output signal.

[0112] After the fourth control phase, the cycle enters the second control phase, where the main control module 600 again controls the switching module in the first control phase. At this time, the conduction state of the voltage control current element is the same as in the first control phase. During this phase, the inductor L's state is consistent with the first control phase; that is, the inductor L continues charging according to the charging signal. Simultaneously, the main control module 600 controls the third switching module 500 to conduct, enabling the voltage control module 300, external power supply 700, and load 800 to form a current loop. At this time, the voltage control module 300 outputs a stable target output signal to the load 800. Subsequently, the second, third, and fourth control phases are executed again, and this cycle continues.

[0113] The control signal generated by the main control module 600 in the first control stage can be generated by the drive unit 640 of the main control module 600 based on the second square wave signal PH1 in the above embodiment. The control signal generated by the main control module 600 in the second control stage can be generated by the drive unit 640 based on the third square wave signal PH2 in the above embodiment. In the third control stage, the drive unit 640 of the main control module 600 generates a discharge control signal because it does not receive a high-level signal sent by the duty cycle adjustment unit 630. The control signal generated by the main control module 600 in the fourth control stage can be generated by the drive unit 640 based on the first square wave signal PH4 in the above embodiment.

[0114] like Figure 2As shown, in some specific embodiments of the present invention, the fourth switching unit 410 includes an eighth voltage-controlled current element M8 and a ninth voltage-controlled current element M9, and the fifth switching unit 420 includes a tenth voltage-controlled current element M10 and an eleventh voltage-controlled current element M11. The source of the eighth voltage-controlled current element M8 is electrically connected to the first capacitor C1, the drain of the eighth voltage-controlled current element M8 is electrically connected to the second capacitor C2, and the gate of the eighth voltage-controlled current element M8 is electrically connected to the main control module 600; the source of the ninth voltage-controlled current element is electrically connected to the connection node of the second capacitor C2 and the fourth voltage-controlled current element M4, the drain of the ninth voltage-controlled current element M9 is electrically connected to the connection node of the first capacitor C1 and the eighth voltage-controlled current element M8, and the gate of the ninth voltage-controlled current element M9 is electrically connected to the main control module 600; the source of the tenth voltage-controlled current element M10 is electrically connected to the connection node of the second capacitor C1 and the fourth voltage-controlled current element M4. The connection node of the 2nd and the eighth voltage-controlled current element M8 is electrically connected. The drain of the tenth voltage-controlled current element M10 is electrically connected to the connection node of the third capacitor C3 and the third switch module 500. The gate of the tenth voltage-controlled current element M10 is electrically connected to the main control module 600. The source of the eleventh voltage-controlled current element M11 is electrically connected to the connection node of the third capacitor C3 and the seventh voltage-controlled current element M7. The drain of the eleventh voltage-controlled current element M11 is electrically connected to the connection node of the second capacitor C2 and the tenth voltage-controlled current element M10. The gate of the eleventh voltage-controlled current element M11 is electrically connected to the main control module 600.

[0115] Specifically, the switching control of the second switch module 400 by the main control module 600 can be divided into four cyclic control phases, which correspond to the switching control phases of the first switch module 200 by the main control module 600 described above. (Refer to...) Figure 2 , Figure 7 The first control phase is the first charging phase. During this phase, the main control module 600 generates a voltage regulation control signal that controls the eighth voltage control element M8 to turn off, the ninth voltage control element M9 to turn on, and the tenth voltage control element M10 and the eleventh voltage control element M11 to turn off. In this phase, the first capacitor C1, the second capacitor C2, the third capacitor C3, the external power supply 700, and the load 800 can also form a current loop. Since the three capacitors in the voltage control module 300 have not yet been boosted, the voltage output to the load 800 is the initial voltage provided by the external power supply 700.

[0116] Reference Figure 2 , Figure 8The second control stage is the second charging stage. During this stage, the main control module 600 generates a voltage regulation control signal that controls the eighth voltage control element M8 to turn off, the ninth voltage control element M9 to turn on, and the tenth voltage control element M10 and the eleventh voltage control element M11 to turn off. In this stage, the first capacitor C1, the second capacitor C2, the third capacitor C3, the external power supply 700, and the ground terminal can form a current loop. At this time, the three capacitors in the voltage control module 300 can perform preliminary voltage regulation.

[0117] Reference Figure 2 , Figure 9 The third control stage is the discharge stage. During this stage, the main control module 600 generates a voltage regulation control signal that can control the eighth voltage control element M8 and the ninth voltage control element M9 to turn off, the tenth voltage control element M10 to turn on, and the eleventh voltage control element M11 to turn off. In this stage, the inductor L, the voltage control module 300, the external power supply 700, and the ground terminal can form a current loop, so that the inductor L can release the electrical energy stored in the previous charging operation to the second capacitor C2 and the third capacitor C3. That is, the second capacitor C2 and the third capacitor C3 receive the boost signal, so that the voltage across the second capacitor C2 and the third capacitor C3 increases.

[0118] Reference Figure 2 , Figure 10 The fourth stage is the voltage boosting and stabilization stage. During this stage, the main control module 600 generates a voltage stabilization control signal that controls the eighth voltage control element M8 to turn on, the ninth voltage control element M9 to turn off, and the tenth and eleventh voltage control elements M10 and M11 to turn off. In this stage, the first capacitor C1, the second capacitor C2, the external power supply 700, and the ground terminal can form a current loop. At this time, the first capacitor C1 and the second capacitor C2 can regulate the boosted voltage through mutual charging and discharging, thereby obtaining a stable target output signal.

[0119] After the fourth control phase, the cycle enters the second control phase, where the main control module 600 again controls the switching module in the first control phase. At this time, the conduction state of the voltage-controlled current element is the same as in the first control phase. During this phase, the inductor L's state is consistent with the first control phase; that is, the inductor L continues charging according to the charging signal. Simultaneously, the main control module 600 controls the third switching module 500 to conduct, enabling the first capacitor C1, second capacitor C2, third capacitor C3, external power supply 700, and load 800 to form a current loop. At this time, the first capacitor C1, second capacitor C2, and third capacitor C3 output a stable target output signal to the load 800. Subsequently, the second, third, and fourth control phases are executed again, and this cycle repeats.

[0120] In some specific embodiments of the present invention, the first voltage control element M1 and the fifth voltage control element M5 are P-type field-effect transistors, and the second voltage control element M2, the third voltage control element M3, the fourth voltage control element M4, the sixth voltage control element M6, the seventh voltage control element M7, the eighth voltage control element M8, the ninth voltage control element M9, the tenth voltage control element M10, and the eleventh voltage control element M11 are all N-type field-effect transistors.

[0121] The voltage relationships of the four control stages of the voltage conversion circuit in this embodiment will be described below.

[0122] Let D0 be the initial discharge phase of inductor L, DN be the discharge phase of inductor L in the Nth control stage, and V L N is the voltage across inductor L in the Nth control stage, Vin is the voltage provided by external power supply 700, Vout is the voltage output to load 800, Vc1 is the voltage across the first capacitor C1, Vc2 is the voltage across the second capacitor C2, and Vc3N is the voltage across the third capacitor C3. According to Figures 7 to 10 From the current loop relationship, the voltage relationship can be obtained as shown in equations (1) and (2):

[0123] V L 1*D1=V L 2*D2=V L 4*D4=-Vin*(1-D0) / 3..............Equation (1)

[0124] V L 3*D3=(Vc3-Vc2-Vin)*D0............Formula (2)

[0125] Because the volt-second balance across the inductor L is achieved, therefore V L 1*D1+V L 2*D2+V L 3*D3+V L 4*D4=0. Substituting this relation into equations (1) and (2) above, we can simplify to obtain equation (3):

[0126] (Vc3-Vc2-Vin)*D0+(-Vin*(1-D0))=0..............Equation (3)

[0127] Furthermore, in the first control stage, the second control stage, and the fourth control stage, based on the voltage balance of the capacitor, the following equations (4) to (6) can be obtained:

[0128] Vout*D1=(Vc1+Vc2+Vc3+Vin)*D1..............Equation (4)

[0129] (Vc1+Vc2)*D2=(Vin+Vc3)*D2..............Equation (5)

[0130] (Vc1+Vin)*D4=Vc2*D4............Formula (6)

[0131] Combining equations (3), (4), (5), and (6), we can obtain equations (7) to (10):

[0132] Vc1=(1+1 / D0)*Vin..............Equation (7)

[0133] Vc2=(2+1 / D0)*Vin..............Equation (8)

[0134] Vc3=2*(1+1 / D0)*Vin..............Equation (9)

[0135] Vout=(6+4 / D0)*Vin..............Equation (10)

[0136] According to equation (10), the boost voltage conversion ratio between the input voltage Vin and the output voltage Vout is 6+4 / D0.

[0137] Understandably, referring to Figure 2 The above descriptions all refer to boost converter circuits. This voltage converter circuit can also be applied to buck converters; simply... Figure 2 By swapping the input voltage Vin of the external power supply 700 with the output voltage Vout of the load 800, a buck converter circuit can be obtained. The voltage conversion ratio of this buck converter circuit is D0 / (6*D0+4). The control logic of this buck converter circuit is the same as that of the boost converter circuit in the above embodiment, and can be referred to the description in the above embodiment.

[0138] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments, and various changes can be made within the scope of knowledge possessed by those skilled in the art without departing from the spirit of the present invention. Furthermore, the embodiments of the present invention and the features thereof can be combined with each other unless otherwise specified.

Claims

1. A voltage conversion circuit, characterized in that, include: An energy storage module, one end of which is electrically connected to an external power source; wherein the external power source is used to provide a charging signal; the energy storage module includes: an inductor, one end of which is electrically connected to the external power source, and the other end of which is electrically connected to a first switching module; The first switch module is used to connect to the energy storage module and the ground terminal respectively; A voltage control module is provided, which is electrically connected to the first switch module. The voltage control module includes: a first capacitor, one end of which is electrically connected to the first switch module, and the other end of which is electrically connected to a second switch module; a second capacitor, one end of which is electrically connected to one end of both the first and second switch modules, and the other end of which is electrically connected to the other end of the second switch module; and a third capacitor, one end of which is electrically connected to one end of both the first and second switch modules, and the other end of which is electrically connected to the other end of both the second and third switch modules. The second switching module is used to be electrically connected to the voltage control module and the first switching module respectively. The working state of the second switching module includes a voltage regulation control state. The third switch module is used to be electrically connected to the voltage control module and the load respectively; The main control module is electrically connected to the first switch module, the second switch module, and the third switch module respectively, and is used to generate charging control signal, discharging control signal, voltage regulation control signal, and output control signal respectively. The first switching module is configured to switch to a charging on state according to the charging control signal, so that the energy storage module performs a charging operation according to the charging signal; the first switching module is configured to switch to a discharging on state according to the discharging control signal, so that the energy storage module generates a boost signal after the charging operation; the second switching module is configured to switch to a voltage regulation on state according to the voltage regulation control signal, so that the voltage control module generates a target output signal according to the boost signal; and the third switching module is configured to turn on according to the output control signal, so as to send the target output signal to the load. The first switching module includes: a first switching unit, which is electrically connected to one end of the first capacitor, the external power supply, the main control module, and ground, respectively, and is used to control the connection state between the external power supply and the first capacitor according to the charging control signal and the discharging control signal; a second switching unit, which is electrically connected to one end of the second capacitor, the inductor, the main control module, and ground, respectively, and is used to switch to a first charging conduction state according to the charging control signal so that the inductor performs a charging operation according to the charging signal, and is also used to switch to a first discharging conduction state according to the discharging control signal so that the inductor generates a boost signal after the charging operation; and a third switching unit, which is electrically connected to one end of the third capacitor, the external power supply, the main control module, and ground, respectively, and is used to control the connection state between the external power supply and the third capacitor according to the charging control signal and the discharging control signal.

2. The voltage conversion circuit according to claim 1, characterized in that, The main control module includes: The compensation unit is used to be electrically connected to the connection node of the third switch module and the load, and the compensation unit is used to perform signal compensation operation according to the target output signal; An edge limiting unit is provided, which is electrically connected to the compensation unit and is used to perform an edge limiting operation based on the target output signal after the signal compensation operation to obtain a feedback signal. A duty cycle adjustment unit is provided, which is electrically connected to the edge limiting unit and the clock signal source respectively; wherein, the clock signal source is used to provide a clock signal, and the duty cycle adjustment unit is used to adjust the duty cycle of the feedback signal according to the clock signal to obtain a modulation signal; The driving unit is electrically connected to the duty cycle adjustment unit, the first switch module, the second switch module, and the third switch module, respectively. The driving unit is used to generate the charging control signal, the discharging control signal, the voltage regulation control signal, and the output control signal according to the modulation signal.

3. The voltage conversion circuit according to claim 2, characterized in that, The duty cycle adjustment unit includes: A first ramp generator is used to be electrically connected to the clock signal source. The first ramp generator is used to detect the rising edge of the clock signal and generate a first ramp signal. A first comparator, wherein a first input terminal of the first comparator is electrically connected to the edge limiting unit, a second input terminal of the first comparator is electrically connected to the first ramp generator, and an output terminal of the first comparator is electrically connected to the driving unit, and the first comparator is used to generate a first square wave signal based on the feedback signal and the first ramp signal; A second ramp generator is used to electrically connect to the output of the first comparator. The second ramp generator is used to detect the falling edge of the first square wave signal and generate a second ramp signal. The second comparator has a first input terminal electrically connected to the edge limiting unit, a second input terminal electrically connected to the second ramp generator, and an output terminal electrically connected to the driving unit. The second comparator is used to generate a second square wave signal based on the feedback signal and the second ramp signal. A third ramp generator is used to electrically connect to the output of the second comparator. The third ramp generator is used to detect the falling edge of the second square wave signal and generate a third ramp signal. The third comparator has a first input terminal for being electrically connected to the edge limiting unit, a second input terminal for being electrically connected to the third ramp generator, and an output terminal for being electrically connected to the driving unit. The third comparator is used to generate a third ramp signal based on the feedback signal and the third ramp signal. The driving unit is used to generate the charging control signal, the discharging control signal, the voltage regulation control signal, and the output control signal based on the first square wave signal, the second square wave signal, and the third square wave signal.

4. The voltage conversion circuit according to any one of claims 1 to 3, characterized in that, The second switch module includes: The fourth switching unit has a first terminal for electrically connecting to one end of the first capacitor, a second terminal for electrically connecting to one end of the second capacitor, and a third terminal for electrically connecting to the other end of the second capacitor and the second switching unit, respectively. The fourth switching unit is used to switch to a voltage-regulated on state according to the voltage regulation control signal. The fifth switching unit has a first terminal for electrical connection to the connection node of the second capacitor and the fourth switching unit, a second terminal for electrical connection to the connection node of the third capacitor and the third switching module, and a third terminal for electrical connection to the connection node of the third capacitor and the third switching unit. The fifth switching unit is used to switch to a voltage-regulated on state according to the voltage regulation control signal, so that the first capacitor, the second capacitor, and the third capacitor generate the target output signal according to the boost signal.

5. The voltage conversion circuit according to any one of claims 4, characterized in that, The first switching unit includes: The first voltage-controlled current element has its source electrically connected to the external power supply, its drain electrically connected to the first capacitor, and its gate electrically connected to the main control module. The second voltage-controlled current element has its source electrically connected to ground, its drain electrically connected to the connection node of the first capacitor and the first voltage-controlled current element, and its gate electrically connected to the main control module. The second switching unit includes: The third voltage-controlled current element has its source electrically connected to ground, its drain electrically connected to the inductor, and its gate electrically connected to the main control module. The fourth voltage-controlled current element has its source electrically connected to the connection node of the inductor and the third voltage-controlled current element, its drain electrically connected to the second capacitor, and its gate electrically connected to the main control module. The third switching unit includes: The fifth voltage-controlled current element, wherein the source of the fifth voltage-controlled current element is used to be electrically connected to the external power supply, and the gate of the fifth voltage-controlled current element is used to be electrically connected to the main control module; The sixth voltage-controlled current element has its source electrically connected to the drain of the fifth voltage-controlled current element, its drain electrically connected to the third capacitor, and its gate electrically connected to the main control module. The seventh voltage-controlled current element has its source electrically connected to ground, its drain electrically connected to the connection node of the third capacitor and the sixth voltage-controlled current element, and its gate electrically connected to the main control module.

6. The voltage conversion circuit according to claim 5, characterized in that, The fourth switching unit includes: The eighth voltage-controlled current element has its source electrically connected to the first capacitor, its drain electrically connected to the second capacitor, and its gate electrically connected to the main control module. The ninth voltage-controlled current element has its source electrically connected to the connection node of the second capacitor and the fourth voltage-controlled current element, its drain electrically connected to the connection node of the first capacitor and the eighth voltage-controlled current element, and its gate electrically connected to the main control module. The fifth switching unit includes: The tenth voltage-controlled current element has its source electrically connected to the connection node of the second capacitor and the eighth voltage-controlled current element, its drain electrically connected to the connection node of the third capacitor and the third switching module, and its gate electrically connected to the main control module. The eleventh voltage-controlled current element has its source electrically connected to the connection node of the third capacitor and the seventh voltage-controlled current element, its drain electrically connected to the connection node of the second capacitor and the tenth voltage-controlled current element, and its gate electrically connected to the main control module.

7. The voltage conversion circuit according to claim 6, characterized in that, The first and fifth voltage control elements are P-type field-effect transistors, while the second, third, fourth, sixth, seventh, eighth, ninth, tenth, and eleventh voltage control elements are all N-type field-effect transistors.

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