A direct-current voltage conversion circuit, an electronic device, and a direct-current voltage conversion method

Abstract

The embodiment of the application provides a kind of direct current voltage conversion circuit, electronic equipment and direct current voltage conversion method, belong to voltage converter technical field, the circuit includes phase control module, first switch unit and voltage input module, flying capacitor and inductance are connected, flying capacitor is grounded by second switch unit, control signal generation unit is connected with voltage output module, control signal generation unit is used to generate first control signal and second control signal based on direct current output voltage, under the same time sequence, the level of first control signal and the level of second control signal are opposite, first switch unit and first discharge control unit are used to determine the first current transmission channel between flying capacitor and voltage output module according to first control signal, second switch unit and second discharge control unit are used to determine the second current transmission channel between inductance and voltage output module according to second control signal.The embodiment of the application can improve the conversion efficiency of direct current voltage converter.

Description

Technical Field

[0001] This application relates to the field of voltage converter technology, and in particular to a DC voltage conversion circuit, electronic device, and DC voltage conversion method. Background Technology

[0002] In related technologies, a conventional buck-boost converter (CBBC) typically includes an inductor, an output capacitor, and four switches: two for the buck bridge and two for the boost bridge. This type of converter can operate in multiple or single modes. In multi-mode operation, the buck and boost bridges are controlled independently, achieving higher conversion efficiency. However, the duty cycles differ between the two modes, requiring complex control circuitry to prevent drastic output voltage changes during mode switching. Furthermore, the discontinuity of the target output current results in significant output voltage ripple. In single-mode operation, by simultaneously conducting complementary switches in both bridge arms, the output voltage can be controlled with a single duty cycle. However, this approach leads to a larger inductor current, resulting in lower conversion efficiency compared to multi-mode operation. To address this, a hybrid buck-boost converter combining an inductor and a flying capacitor exists, reducing inductor current to improve conversion efficiency. However, this structure still suffers from large or abrupt output voltage fluctuations during mode switching, causing losses in circuit components.

[0003] Therefore, improving the conversion efficiency of DC-DC converters has become an urgent technical problem to be solved. Summary of the Invention

[0004] The main objective of this application is to provide a DC voltage conversion circuit, electronic device, and DC voltage conversion method, which aims to improve the conversion efficiency of the DC voltage converter.

[0005] To achieve the above objectives, a first aspect of this application provides a DC voltage conversion method, the method comprising: Voltage input module, used to connect DC input voltage; The current sustaining module includes a flying capacitor and an inductor. The voltage output module is used to determine the DC output voltage based on the target output current. The phase control module includes a control signal generation unit, a first switching unit, a second switching unit, a first discharge control unit, and a second discharge control unit. The first terminal of the first switching unit is connected to the voltage input module and is used to charge the flying capacitor and inductor with DC input voltage according to the conduction state of the first switching unit. The second terminal of the first switching unit is connected to the first terminal of the flying capacitor and the first terminal of the inductor, respectively. The second terminal of the flying capacitor is grounded through the second switching unit. The second terminals of the flying capacitor and the inductor are connected to the first discharge control unit, respectively. The second terminal of the inductor is also connected to the second discharge control unit. The first and second discharge control units are connected to the voltage output module. The control signal generation unit is connected to the voltage output module. The control signal generation unit is used to generate a first control signal and a second control signal based on the DC output voltage. The level of the first control signal and the level of the second control signal are opposite under the same timing. The first switching unit and the first discharge control unit are used to determine a first current transmission channel between the flying capacitor and the voltage output module according to the first control signal, so that the flying capacitor outputs the target output current through the first current transmission channel. The second switching unit and the second discharge control unit are used to determine a second current transmission channel between the inductor and the voltage output module according to the second control signal, so that the inductor outputs the target output current through the second current transmission channel.

[0006] This application proposes a DC-DC voltage conversion circuit that precisely controls a first control signal and a second control signal through a control signal generation unit of a phase control module. The two signals have opposite levels at the same timing, allowing the target output current to be continuously output through alternating first and second current transmission channels. Furthermore, controlling the duty cycle of only one control signal controls the switching frequency of the two current transmission channels, thereby controlling the DC output voltage. This avoids voltage spikes during mode switching without the need for complex control circuitry. The embodiments of this application effectively avoid voltage fluctuations caused by mode switching in traditional boost / buck converters. By controlling the continuous alternation of the first and second current transmission channels, continuous current output to the voltage output module is achieved, effectively reducing inductor current and output voltage ripple, ultimately improving the conversion efficiency of the DC-DC voltage converter.

[0007] In some embodiments, the first discharge control unit includes a third switch section and a fourth switch section. The first terminal of the third switch section is connected to the second terminal of the flying capacitor, and the second terminal of the third switch section is connected to the voltage output module. The first terminal of the fourth switch section is connected to the second terminal of the inductor, and the second terminal of the fourth switch section is grounded. The first switch unit, the third switch section, and the fourth switch section are used to turn on or off according to a first control signal, so as to form a first current transmission channel when turned on, or to disconnect the first current transmission channel when turned off.

[0008] In some embodiments, the second discharge control unit includes a fifth switch section, a first terminal of which is connected to a second terminal of an inductor, and a second terminal of which is connected to a voltage output module. The second switch unit and the fifth switch section are used to turn on or off according to a second control signal, so as to form a second current transmission channel when turned on, or to disconnect the second current transmission channel when turned off.

[0009] In some embodiments, the fourth switching section includes a fourth switching transistor and a fourth operational amplifier. The first terminal of the fourth switching transistor is connected to the second terminal of an inductor and the second terminal of the fourth switching transistor is grounded. The third terminal of the fourth switching transistor is connected to the first terminal of the fourth operational amplifier. The second terminal of the fourth operational amplifier is connected to a control signal generation unit and the third terminal of the fourth operational amplifier is connected to a voltage input module. The fourth terminal of the fourth operational amplifier is grounded.

[0010] In some embodiments, the fifth switching unit includes a fifth switching transistor, a fifth operational amplifier, a diode, and a startup capacitor. The first terminal of the fifth switching transistor is connected to the second terminal of an inductor, and the second terminal of the fifth switching transistor is connected to a voltage output module. The third terminal of the fifth switching transistor is connected to the first terminal of the fifth operational amplifier. The second terminal of the fifth operational amplifier is connected to the second terminal of the inductor and the first terminal of the startup capacitor, respectively. The second terminal of the startup capacitor is connected to the third terminal of the fifth operational amplifier and the cathode of the diode, respectively. The fourth terminal of the fifth operational amplifier is connected to a control signal generation unit, and the anode of the diode is connected to a voltage input module.

[0011] In some embodiments, the control signal generation unit includes an inductor current sensing unit, an output voltage sensing unit, and a signal generation unit. The output voltage sensing unit is connected to the signal generation unit and the voltage output module, respectively. The output voltage sensing unit is used to determine the feedback voltage based on the DC output voltage. The inductor current sensing unit is used to detect the inductor current generated by the inductor to send an inductor current detection signal to the signal generation unit. The signal generation unit is used to generate a first control signal or a second control signal based on the feedback voltage and the voltage of the inductor current detection signal.

[0012] In some embodiments, the output voltage sensing unit includes a first resistor and a second resistor. The first end of the first resistor is connected to the voltage output module, the second end of the first resistor is connected to the first end of the second resistor and the signal generation unit, and the second end of the second resistor is grounded.

[0013] In some embodiments, the voltage output module includes an output capacitor and a third resistor. The first terminal of the output capacitor is connected to the first discharge control unit, the second discharge control unit, and the first terminal of the third resistor, respectively. The second terminal of the output capacitor is grounded, and the second terminal of the third resistor is grounded.

[0014] To achieve the above objectives, a second aspect of the present application provides an electronic device, which includes a DC voltage conversion circuit as described in the first aspect.

[0015] This application proposes an electronic device that, by using the DC-DC voltage conversion circuit described in the first aspect, can achieve boost / buck conversion with a single duty cycle, avoiding output voltage fluctuations caused by mode switching, reducing the manufacturing process requirements for power switches, and thus reducing manufacturing costs. Because the capacitor and inductor currents can alternately output current according to the first and second current transmission channels, the inductor current is effectively reduced, thereby significantly reducing conduction losses.

[0016] To achieve the above objectives, a third aspect of this application provides a DC voltage conversion method applied to the DC voltage conversion circuit described in the first aspect, the method comprising: Obtain the DC input voltage of the voltage input module and the feedback voltage of the voltage output module; An error signal is generated based on the feedback voltage and the preset target voltage value; The error signal is amplified and processed to obtain the error output voltage signal; Acquire the inductor current detection signal from the current sustaining module; A first control signal is generated based on the inductor current detection signal, the error output voltage signal, and the preset clock signal. The first control signal is then inverted to obtain a second control signal. The first switching unit and the first discharge control unit are controlled based on the first control signal, and the second switching unit and the second discharge control unit are controlled based on the second control signal, so as to convert the DC input voltage into a DC output voltage.

[0017] This application proposes a DC voltage conversion method that generates an error signal by comparing the feedback voltage with the target voltage value, and then adjusts the control signal by combining the inductor current detection signal and the clock signal, thereby achieving efficient conversion of DC input voltage. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of an optional module of the DC-DC voltage conversion circuit provided in an embodiment of this application; Figure 2 This is an optional circuit structure diagram of the DC voltage conversion circuit provided in the embodiments of this application; Figure 3 This is a schematic diagram of the first current transmission channel provided in an embodiment of this application; Figure 4 This is a schematic diagram of the second current transmission channel provided in an embodiment of this application; Figure 5 This is another optional circuit structure diagram of the DC voltage conversion circuit according to an embodiment of this application; Figure 6 This is an optional flowchart of the DC voltage conversion method provided in the embodiments of this application; Figure 7 This is a waveform diagram of the DC-DC voltage conversion circuit provided in the embodiments of this application; Figure 8 This is another operating waveform diagram of the DC voltage conversion circuit provided in the embodiments of this application; Figure 9 This is a graph showing the normalized output voltage ripple curve of the DC-DC voltage conversion circuit provided in the embodiments of this application.

[0019] Reference numerals: Voltage input module 100; Current maintenance module 200; Voltage output module 300; Control signal generation unit 410; First switching unit 420; Second switching unit 430; First discharge control unit 440; Third switching unit 441; Fourth switching unit 442; Second discharge control unit 450; Fifth switching unit 451. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0021] It should be noted that although functional modules are divided in the device schematic diagram and a logical order is shown in the flowchart, in some cases, the steps shown or described may be performed in a different order than the module division in the device or the order in the flowchart. The terms "first," "second," etc., in the specification, claims, and the aforementioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

[0022] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing embodiments of this application only and is not intended to limit this application.

[0023] In related technologies, a conventional DC-DC buck-boost converter (CBBC) typically includes an inductor, an output capacitor, and four switches: two for the buck bridge and two for the boost bridge. This type of converter can operate in multiple or single modes. In multi-mode operation, the buck and boost bridges are controlled independently, achieving higher conversion efficiency. However, the different duty cycles of the two modes cause discontinuous duty cycles during mode transitions, leading to output voltage fluctuations. To avoid drastic output voltage changes during mode switching, complex control circuitry is required. Furthermore, the discontinuity of the target output current results in significant output voltage ripple. In single-mode operation, by simultaneously turning on complementary switches in both bridge arms, the output voltage can be controlled with only a single duty cycle. However, this approach results in a larger inductor current, leading to a lower conversion efficiency compared to multi-mode operation. To address this, existing solutions include hybrid boost / buck converters that combine inductors and flying capacitors. While this reduces inductor current to improve conversion efficiency, the power switches must withstand higher voltages, leading to efficiency losses. Furthermore, the power switches require high-voltage manufacturing processes, increasing production costs. These hybrid converters typically incorporate substrate bias switching circuitry, increasing the complexity of the drive design and the risk of system failure. They still suffer from significant output voltage fluctuations due to operating mode switching and drastic voltage changes in the flying capacitor, ultimately causing device losses in the circuit.

[0024] Therefore, improving the conversion efficiency of DC-DC converters has become an urgent technical problem to be solved. Based on this, embodiments of this application provide a DC-DC conversion circuit, electronic device, and DC-DC conversion method, aiming to improve the conversion efficiency of DC-DC converters.

[0025] This application provides a DC voltage conversion circuit, electronic device, and DC voltage conversion method, which are specifically described through the following embodiments. First, the DC voltage conversion circuit in the embodiments of this application is described.

[0026] Figure 1 This is a schematic diagram of an optional module of the DC-DC voltage conversion circuit provided in an embodiment of this application. The DC-DC voltage conversion circuit provided in this embodiment includes: Voltage input module 100, the voltage input module 100 is used to connect DC input voltage V IN .

[0027] Current sustaining module 200, the current sustaining module 200 includes a flying capacitor C F And inductance L.

[0028] Voltage output module 300, the voltage output module 300 is used to output current I according to the target output current I D Determine the DC output voltage V O .

[0029] The phase control module includes a control signal generation unit 410, a first switching unit 420, a second switching unit 430, a first discharge control unit 440, and a second discharge control unit 450. The first terminal of the first switching unit 420 is connected to the voltage input module 100 and is used to adjust the DC input voltage to the flying capacitor C according to the conduction state of the first switching unit 420. F The inductor L is charged, and the second terminal of the first switching unit 420 is connected to the flying capacitor C. F The first terminal is connected to the first terminal of the inductor L, and the flying capacitor C is connected. F The second terminal is grounded through the second switching unit 430, and the flying capacitor C F The second end of the inductor L and the second end of the inductor L are respectively connected to the first discharge control unit 440. The second end of the inductor L is also connected to the second discharge control unit 450. The first discharge control unit 440 and the second discharge control unit 450 are respectively connected to the voltage output module 300.

[0030] The control signal generation unit 410 is connected to the voltage output module 300. The control signal generation unit generates a first control signal and a second control signal based on the DC output voltage. The levels of the first control signal and the second control signal are opposite in the same timing sequence. The first switching unit 420 and the first discharge control unit 440 determine a first current transmission path between the flying capacitor and the voltage output module 300 based on the first control signal, so that the flying capacitor outputs the target output current through the first current transmission path. The second switching unit 430 and the second discharge control unit 450 determine a second current transmission path between the inductor and the voltage output module 300 based on the second control signal, so that the inductor outputs the target output current through the second current transmission path. It should be noted that the first and second control signals can be pulse-width modulated signals. Since the levels of the first and second control signals are opposite in the same timing sequence, the sum of the duty cycle D1 of the first control signal and the duty cycle D2 of the second control signal is 1, i.e., D2 = 1 - D1. During the operation of the DC-DC voltage conversion circuit, the first current transmission channel and the second current transmission channel are formed alternately, which can continuously output the target output current to the voltage output module 300.

[0031] The DC voltage conversion circuit provided in this application embodiment can precisely control the first and second control signals through the control signal generation unit of the phase control module. The two signals have opposite levels in the same timing sequence, allowing the target output current to be continuously output through alternating first and second current transmission channels. Furthermore, controlling the duty cycle of only one control signal controls the switching frequency of the two current transmission channels, thereby controlling the DC output voltage. This avoids voltage spikes during mode switching without the need for complex control circuitry. The DC voltage conversion circuit provided in this application embodiment effectively avoids voltage fluctuations caused by traditional boost / buck converters during operating mode switching. By controlling the continuous alternation of the first and second current transmission channels, continuous current output to the voltage output module is achieved, effectively reducing inductor current and output voltage ripple, ultimately improving the conversion efficiency of the DC voltage converter.

[0032] In some embodiments, please refer to Figure 2 , Figure 2 This is an optional circuit structure diagram of the DC-DC voltage conversion circuit provided in the embodiments of this application. Figure 2 The control signal generation unit 410 is not shown in the diagram. The first discharge control unit 440 includes a third switch section 441 and a fourth switch section 442. The first terminal of the third switch section 441 is connected to the flying capacitor C. F The second terminal of the first switch unit 420 is connected to the second terminal of the inductor, the second terminal of the third switch unit 441 is connected to the voltage output module 300, the first terminal of the fourth switch unit 442 is connected to the second terminal of the inductor, and the second terminal of the fourth switch unit 442 is grounded. The first switch unit 420, the third switch unit 441, and the fourth switch unit 442 are used to turn on or off according to the first control signal, so as to form a first current transmission channel when turned on, or to disconnect the first current transmission channel when turned off. D V represents the target output current. O Indicates the DC output voltage, I O Indicates the output current source, C O This indicates the output capacitor.

[0033] When the first current transmission channel is formed, the DC voltage change circuit forms the first phase at this time. Please see Figure 3 , Figure 3 This is a schematic diagram of the first current transmission channel provided in the embodiments of this application. Figure 3 The control signal generation unit 410 is not shown in the diagram. The red line represents the first current transmission channel, +V L It refers to the voltage across the inductor L, I L This refers to the inductance current of inductor L. This refers to the flying capacitor C FThe current output through the first current output channel.

[0034] In some embodiments, the second discharge control unit 450 includes a fifth switch unit 451. The first end of the fifth switch unit 451 is connected to the second end of the inductor, and the second end of the fifth switch unit 451 is connected to the voltage output module 300. The second switch unit 430 and the fifth switch unit 451 are used to conduct or turn off according to the second control signal, so as to form a second current transmission channel when conducting, or disconnect the second current transmission channel when turning off. When the second current transmission channel is formed, the DC voltage change circuit forms a second phase at this time , please refer to Figure 4 , Figure 4 is a schematic diagram of the second current transmission channel provided by the embodiment of the present application ( Figure 4 the control signal generation unit 410 is not drawn). Among them, the blue line represents the second current transmission channel, +V L refers to the voltage across the inductor L, I L refers to the inductor current of the inductor L, refers to the flying capacitor C F and the current output by the inductor L through the second current output channel.

[0035] It should be added that at the first phase , the voltage V L across the inductor is V IN . At the second phase , the voltage V L across the inductor is V IN -2V0. The conversion ratio M of the DC voltage conversion circuit provided by the embodiment of the present application can refer to the following analytical formula: , Among them, V IN represents the DC input voltage, V0 represents the DC output voltage, and D represents the duty cycle of the first control signal. When 0 < D < 0.5, 0.5 < M < 1, supporting buck conversion. When D > 0.5, M > 1, supporting boost conversion. The conversion ratio M increases monotonically with the increase of the duty cycle D, and there is no problem of sudden change of the duty cycle during traditional step-up / step-down switching.

[0036] Furthermore, please refer to Figure 5 , Figure 5 is another optional circuit structure diagram of the DC voltage conversion circuit provided by the embodiment of the present application. In some embodiments, the first switch unit 420 includes a first switch tube S1 and a first operational amplifier. The first end of the first operational amplifier is connected to the control signal generation unit 410 for receiving the voltage V G1The second terminal of the first operational amplifier is connected to both the voltage input module 100 and the source of the first switching transistor S1. The third terminal of the first operational amplifier is connected to the gate of the first switching transistor S1, and the fourth terminal of the first operational amplifier is grounded. The drain of the first switching transistor S1 is connected to both the flying capacitor C and the gate of the first switching transistor S1. F The first terminal is connected to the first terminal of inductor L.

[0037] In some embodiments, the second switching unit 430 includes a second switching transistor S2 and a second operational amplifier. The first terminal of the second operational amplifier is connected to the control signal generation unit 410 and is used to receive voltage V. G2 The second terminal of the second operational amplifier is connected to the voltage input module 100. The third terminal of the second operational amplifier is connected to ground and the source of the second switching transistor S2. The fourth terminal of the second operational amplifier is connected to the gate of the second switching transistor S2. The drain of the second switching transistor S2 is connected to the third switching section 441 and the flying capacitor C. F connect.

[0038] In some embodiments, the third switching unit 441 includes a third switching transistor S3 and a third operational amplifier. The first terminal of the third operational amplifier is connected to the control signal generation unit 410 and is used to receive voltage V. G3 The second terminal of the third operational amplifier is connected to capacitor C. BST3 The first terminal is connected to the source of the third switch S3, and the third terminal of the third operational amplifier is connected to the capacitor C. BST3 The second terminal is connected to the negative terminal of diode D1, and the positive terminal of diode D1 is connected to the voltage input module 100 for receiving DC input voltage V. IN The fourth terminal of the third operational amplifier is connected to the gate of the third switching transistor S3. The drain of the third switching transistor S3 is connected to the fifth switching section 451 and the output capacitor C. O The first end is connected.

[0039] In some embodiments, the fourth switching unit 442 includes a fourth switching transistor S4 and a fourth operational amplifier. The first terminal (i.e., drain) of the fourth switching transistor S4 is connected to the second terminal of the inductor L, the second terminal (i.e., source) of the fourth switching transistor S4 is grounded, the third terminal (i.e., gate) of the fourth switching transistor S4 is connected to the first terminal of the fourth operational amplifier, and the second terminal of the fourth operational amplifier is connected to the control signal generation unit 410 for receiving voltage V. G4 The third terminal of the fourth operational amplifier is connected to the voltage input module 100 to receive the DC input voltage V. IN The fourth terminal of the fourth operational amplifier is grounded.

[0040] In some embodiments, the fifth switching unit 451 includes a fifth switching transistor S5, a fifth operational amplifier, a diode D2, and a start-up capacitor C. BST5The first terminal (source) of the fifth switch S5 is connected to the second terminal of the inductor L. The second terminal (drain) of the fifth switch S5 is connected to the voltage output module 300 (output capacitor C). O The first terminal of the fifth switching transistor S5 is connected to the first terminal of the fifth operational amplifier. The third terminal (i.e., the gate) of the fifth switching transistor S5 is connected to the first terminal of the fifth operational amplifier. The second terminal of the fifth operational amplifier is connected to the second terminal of the inductor L and the starting capacitor C. BST5 The first terminal is connected. Startup capacitor C BST5 The second terminal is connected to the third terminal of the fifth operational amplifier and the cathode of diode D2, respectively. The fourth terminal of the fifth operational amplifier is connected to the control signal generation unit 410 to receive voltage V. G5 The positive terminal of the diode is connected to the voltage input module 100 to receive the DC input voltage V. IN .

[0041] It is understandable that the first operational amplifier, second operational amplifier, third operational amplifier, fourth operational amplifier, and fifth operational amplifier are all driver circuit components for the corresponding switching transistors. The first control signal includes voltage V. G1 Voltage V G3 and voltage V G4 The second control signal includes voltage V G2 and voltage V G5 In other words, the voltage V G1 Voltage V G3 and voltage V G4 Consistent, voltage V G2 and voltage V G5 They are identical, but the two sets of signals have opposite levels at the same timing.

[0042] In some embodiments, the control signal generation unit 410 includes an inductor current sensing unit 411, an output voltage sensing unit 412, and a signal generation unit 413. The output voltage sensing unit is connected to the signal generation unit and the voltage output module 300, respectively, and is used to determine the feedback voltage V based on the DC output voltage. FB The inductor current sensing unit is used to detect the inductor current I generated by the inductor. L The signal generation unit sends an inductor current detection signal to the signal generation unit, which then uses the feedback voltage and the voltage V of the inductor current detection signal to determine the inductor current detection signal. CS Generate either the first control signal or the second control signal.

[0043] In some embodiments, the output voltage sensing unit includes a first resistor R1 and a second resistor R2. The first terminal of the first resistor R1 is connected to the voltage output module 300, and the second terminal of the first resistor R1 is connected to the first terminal of the second resistor R2 and the signal generation unit, respectively. The second terminal of the second resistor R2 is grounded. Specifically, the first terminal of the first resistor R1 is connected to the first terminal of the third resistor R3 and the output capacitor C, respectively. O The first end is connected.

[0044] In some embodiments, the voltage output module 300 includes an output capacitor C. O And the third resistor R3, output capacitor C O The first terminal is connected to the first discharge control unit 440, the second discharge control unit 450, and the first terminal of the third resistor R3, respectively, and the output capacitor C O The second terminal of the capacitor is grounded, and the second terminal of the third resistor R3 is also grounded. Specifically, the first terminal of the output capacitor CO is connected to the drain of the fifth switch S5, the drain of the third switch S3, and the first terminal of the third resistor R3. Figure 5 The signal generation unit 413 will be further explained in conjunction with subsequent embodiments regarding the DC voltage conversion method.

[0045] This application also provides an electronic device including the DC-DC voltage conversion circuit described in the above embodiments. By using the DC-DC voltage conversion circuit described in the above embodiments, this electronic device can achieve boost / buck conversion with a single duty cycle, avoiding output voltage fluctuations caused by mode switching, reducing the manufacturing process requirements for power switches, and thus reducing manufacturing costs. Because the capacitor and inductor currents can alternately output current according to the first current transmission channel and the second current transmission channel, the inductor current is effectively reduced, thereby significantly reducing conduction losses.

[0046] The specific implementation of this electronic device is basically the same as the specific embodiment of the DC voltage conversion circuit described above, and will not be repeated here.

[0047] This application also provides a DC voltage conversion method, which is applied to the DC voltage conversion circuit described in the foregoing embodiments. Please refer to [link to relevant documentation]. Figure 5 and Figure 6 , Figure 6 An optional flowchart of the DC voltage conversion method provided in the embodiments of this application, the method including but not limited to steps S601 to S605: Step S601: Obtain the DC input voltage of the voltage input module and the feedback voltage of the voltage output module.

[0048] Step S602: Generate an error output voltage signal based on the feedback voltage and the preset target voltage value.

[0049] Step S603: Obtain the inductor current detection signal of the current sustaining module.

[0050] Step S604: Generate a first control signal based on the inductor current detection signal, the error output voltage signal, and the preset clock signal, and invert the first control signal to obtain a second control signal.

[0051] Step S605: Control the first switching unit and the first discharge control unit based on the first control signal, and control the second switching unit and the second discharge control unit based on the second control signal, so as to convert the DC input voltage into a DC output voltage.

[0052] In step S601 of some embodiments, the DC input voltage of the voltage input module is... Figure 5 The Chinese character is marked with V. IN The output voltage V of the voltage output module O and feedback voltage V FB Different, feedback voltage V FB Let R1 be the voltage between the first resistor R1 and the second resistor R2.

[0053] In step S602 of some embodiments, the preset target voltage value is the reference voltage V. REF Its specific value can be set according to actual needs. Operational amplifier EA outputs an error output voltage signal V based on the Type-II compensation strategy. EA .

[0054] In step S603 of some embodiments, the inductor current I is detected by the inductor current sensing unit 411. L The inductor current sensing unit 411 can be a current sensor, and the voltage output by the sensor is used as the inductor current detection signal V. CS .

[0055] In step S604 of some embodiments, the clock signal CLK is processed by a ramp generator (Ramp Generator) to generate a ramp signal RAMP. The error output voltage signal V is then... EA With inductor current detection signal V CS Signal integration is performed to obtain signal V. SUM The signal V is compared using comparator CMP. SUMThe ramp signal RAMP is used to generate a PWM signal, which is then used as the first control signal. This signal is inverted and a non-overlapping dead time is added to obtain the second control signal. The non-overlapping dead time ensures that the on-times of the two switches do not completely overlap within a complete PWM cycle. For example, when the first switch S1 is turned off, there is a certain delay before the second switch S2 is turned on, ensuring that the second switch S2 is only allowed to turn on after the first switch S1 is completely turned off.

[0056] In step S605 of some embodiments, the first control signal and the second control signal are level-shifted to obtain the drive level of the gate of each switch transistor, thereby controlling each switch transistor. Specifically, the first control signal is level-shifted to obtain a voltage V. G1 Voltage V G3 and voltage V G4 This drives the first switch S1, the third switch S3, and the fourth switch S4 to turn off and close. The second control signal is converted into voltage V. G2 and voltage V G5 This drives the second switch S2 and the fifth switch S5 to turn off and close.

[0057] Steps S601 to S605, as shown in the embodiments of this application, generate an error signal by comparing the feedback voltage with the target voltage value, and then adjust the control signal by combining the inductor current detection signal and the clock signal, thereby realizing efficient conversion of DC input voltage.

[0058] The DC voltage conversion circuit provided in this application embodiment, under DC input voltage V IN When the voltage range is [2.8V, 4.2V], its inductor current I L With output current I O The ratio (I) L / I O With the DC input voltage V IN The value decreases with increasing voltage, dropping from 1.2 to 0.8. Compared to a traditional DC-DC boost / buck converter (CBBC), at the same DC input voltage V... IN Within the range, the inductor current I L With output current I O The ratio (I) L / I O The voltage drop is from 2.2 to 1.8. Compared to a traditional DC-DC boost / buck converter (CBBC), when the DC input voltage V... IN When =2.8V, the ratio (I) corresponding to the circuit provided in this embodiment is... L / I OThe decrease reached 45%. When the DC input voltage V IN When =4.2V, the ratio (I) corresponding to the circuit provided in this embodiment is... L / I O The decrease was 54%.

[0059] Please see Figure 7 , Figure 7 This is a waveform diagram of the DC-DC voltage conversion circuit provided in the embodiments of this application. The variable on the horizontal axis is time t, and each cycle is divided by the first phase. Second phase The data is divided into two parts, alternating between them. The variables on the three vertical axes are, in order, the inductor current I. L The voltage V across the inductor L L and the capacitor output current I C .

[0060] Please see Figure 8 , Figure 8 This is another working waveform diagram of the DC voltage conversion circuit provided in the embodiments of this application. Figure 8 The output current waveform of the DC-DC voltage conversion circuit of this application is shown. and output voltage ripple waveform The red lines indicate the current and output voltage ripple waveforms, respectively. The gray lines represent the output current and output voltage ripple waveforms of a conventional DC-DC boost / buck converter (CBBC). Because the DC-DC voltage conversion circuit of this application operates in a two-phase state... C and I L Alternating current transfer to the output achieves continuous output current, significantly reducing output ripple and decreasing current I. L .

[0061] Please see Figure 9 , Figure 9 This is a normalized output voltage ripple curve diagram of the DC-DC voltage conversion circuit provided in this application embodiment. Compared to a traditional DC-DC boost / buck converter (CBBC), when the DC input voltage V... IN When the DC input voltage is 2.8V or 4.2V, the normalized output voltage ripple of the circuit provided in this embodiment decreases by 77%. IN When the voltage is 3.6V, the normalized output voltage ripple of the circuit provided in this embodiment decreases by 90%.

[0062] This application can be used in a wide variety of general-purpose or special-purpose computer system environments or configurations. Examples include: personal computers, server computers, handheld or portable devices, tablet devices, multiprocessor systems, microprocessor-based systems, set-top boxes, programmable consumer electronics, network PCs, minicomputers, mainframe computers, and distributed computing environments including any of the above systems or devices. This application can be described in the general context of computer-executable instructions executed by a computer, such as program modules. Generally, program modules include routines, programs, objects, components, data structures, etc., that perform specific tasks or implement specific abstract data types. This application can also be practiced in distributed computing environments where tasks are performed by remote processing devices connected via a communication network. In distributed computing environments, program modules can reside in local and remote computer storage media, including storage devices.

[0063] The embodiments described in this application are for the purpose of more clearly illustrating the technical solutions of the embodiments of this application, and do not constitute a limitation on the technical solutions provided by the embodiments of this application. As those skilled in the art will know, with the evolution of technology and the emergence of new application scenarios, the technical solutions provided by the embodiments of this application are also applicable to similar technical problems.

[0064] Those skilled in the art will understand that the technical solutions shown in the figures do not constitute a limitation on the embodiments of this application, and may include more or fewer steps than shown, or combine certain steps, or different steps.

[0065] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs.

[0066] Those skilled in the art will understand that all or some of the steps in the methods disclosed above, as well as the functional modules / units in the systems and devices, can be implemented as software, firmware, hardware, or suitable combinations thereof.

[0067] The terms “first,” “second,” “third,” “fourth,” etc. (if present) in the specification and accompanying drawings of this application 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 this application 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.

[0068] It should be understood that in this application, "at least one (item)" means one or more, and "more than" means two or more. "And / or" is used to describe the relationship between related objects, indicating that three relationships can exist. For example, "A and / or B" can represent three cases: only A exists, only B exists, and both A and B exist simultaneously, where A and B can be singular or plural. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship. "At least one (item) of the following" or similar expressions refer to any combination of these items, including any combination of single or plural items. For example, at least one (item) of a, b, or c can represent: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", where a, b, and c can be single or multiple.

[0069] In the several embodiments provided in this application, it should be understood that the disclosed apparatus and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of the units described above is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection between apparatuses or units may be electrical, mechanical, or other forms.

[0070] The units described above as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0071] Furthermore, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0072] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes multiple instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods of the various embodiments of this application. The aforementioned storage medium includes various media capable of storing programs, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0073] The preferred embodiments of the present application have been described above with reference to the accompanying drawings, but this does not limit the scope of the claims of the present application. Any modifications, equivalent substitutions, and improvements made by those skilled in the art without departing from the scope and substance of the embodiments of the present application shall be within the scope of the claims of the present application.

Claims

1. A DC voltage conversion circuit, characterized in that, The circuit includes: A voltage input module, wherein the voltage input module is used to connect a DC input voltage; A current sustaining module, the current sustaining module including a flying capacitor and an inductor; A voltage output module, wherein the voltage output module is used to determine the DC output voltage based on the target output current; A phase control module includes a control signal generation unit, a first switching unit, a second switching unit, a first discharge control unit, and a second discharge control unit. The first terminal of the first switching unit is connected to the voltage input module and is used to charge the flying capacitor and the inductor with the DC input voltage according to the conduction state of the first switching unit. The second terminal of the first switching unit is connected to the first terminal of the flying capacitor and the first terminal of the inductor, respectively. The second terminal of the flying capacitor is grounded through the second switching unit. The second terminals of the flying capacitor and the inductor are respectively connected to the first discharge control unit. The second terminal of the inductor is also connected to the second discharge control unit. The first discharge control unit and the second discharge control unit are respectively connected to the voltage output module. The control signal generation unit is connected to the voltage output module. The control signal is used to generate a first control signal and a second control signal based on the DC output voltage. Under the same timing, the level of the first control signal is opposite to the level of the second control signal. The first switching unit and the first discharge control unit are used to determine a first current transmission channel between the flying capacitor and the voltage output module according to the first control signal, so that the flying capacitor outputs the target output current through the first current transmission channel. The second switching unit and the second discharge control unit are used to determine a second current transmission channel between the inductor and the voltage output module according to the second control signal, so that the inductor outputs the target output current through the second current transmission channel.

2. The circuit according to claim 1, characterized in that, The first discharge control unit includes a third switch section and a fourth switch section. The first terminal of the third switch section is connected to the second terminal of the flying capacitor, the second terminal of the third switch section is connected to the voltage output module, the first terminal of the fourth switch section is connected to the second terminal of the inductor, and the second terminal of the fourth switch section is grounded. The first switch unit, the third switch section, and the fourth switch section are used to turn on or off according to the first control signal, so as to form the first current transmission channel when turned on, or to disconnect the first current transmission channel when turned off.

3. The circuit according to claim 2, characterized in that, The second discharge control unit includes a fifth switch section. The first end of the fifth switch section is connected to the second end of the inductor, and the second end of the fifth switch section is connected to the voltage output module. The second switch unit and the fifth switch section are used to turn on or off according to the second control signal, so as to form the second current transmission channel when turned on, or to disconnect the second current transmission channel when turned off.

4. The circuit according to claim 3, characterized in that, The fourth switching section includes a fourth switching transistor and a fourth operational amplifier. The first terminal of the fourth switching transistor is connected to the second terminal of the inductor and the second terminal of the fourth switching transistor is grounded. The third terminal of the fourth switching transistor is connected to the first terminal of the fourth operational amplifier. The second terminal of the fourth operational amplifier is connected to the control signal generation unit and the third terminal of the fourth operational amplifier is connected to the voltage input module. The fourth terminal of the fourth operational amplifier is grounded.

5. The circuit according to claim 4, characterized in that, The fifth switching unit includes a fifth switching transistor, a fifth operational amplifier, a diode, and a startup capacitor. The first terminal of the fifth switching transistor is connected to the second terminal of the inductor, and the second terminal of the fifth switching transistor is connected to the voltage output module. The third terminal of the fifth switching transistor is connected to the first terminal of the fifth operational amplifier. The second terminal of the fifth operational amplifier is connected to the second terminal of the inductor and the first terminal of the startup capacitor. The second terminal of the startup capacitor is connected to the third terminal of the fifth operational amplifier and the negative terminal of the diode. The fourth terminal of the fifth operational amplifier is connected to the control signal generation unit, and the positive terminal of the diode is connected to the voltage input module.

6. The circuit according to any one of claims 1 to 5, characterized in that, The control signal generation unit includes an inductor current sensing unit, an output voltage sensing unit, and a signal generation unit. The output voltage sensing unit is connected to the signal generation unit and the voltage output module, respectively. The output voltage sensing unit is used to determine the feedback voltage based on the DC output voltage. The inductor current sensing unit is used to detect the inductor current generated by the inductor to send an inductor current detection signal to the signal generation unit. The signal generation unit is used to generate the first control signal or the second control signal based on the feedback voltage and the voltage of the inductor current detection signal.

7. The circuit according to claim 6, characterized in that, The output voltage sensing unit includes a first resistor and a second resistor. The first end of the first resistor is connected to the voltage output module, and the second end of the first resistor is connected to the first end of the second resistor and the signal generation unit, respectively. The second end of the second resistor is grounded.

8. The circuit according to any one of claims 1 to 5, characterized in that, The voltage output module includes an output capacitor and a third resistor. The first end of the output capacitor is connected to the first discharge control unit, the second discharge control unit, and the first end of the third resistor, respectively. The second end of the output capacitor is grounded, and the second end of the third resistor is grounded.

9. An electronic device, characterized in that, The electronic device includes a DC voltage conversion circuit as described in any one of claims 1 to 8.

10. A DC voltage conversion method, characterized in that, The method, applied to the DC-DC voltage conversion circuit according to any one of claims 1 to 8, comprises: Obtain the DC input voltage of the voltage input module and the feedback voltage of the voltage output module; An error output voltage signal is generated based on the feedback voltage and the preset target voltage value; Acquire the inductor current detection signal from the current sustaining module; A first control signal is generated based on the inductor current detection signal, the error output voltage signal, and a preset clock signal. The first control signal is then inverted to obtain a second control signal. The first switching unit and the first discharge control unit are controlled based on the first control signal, and the second switching unit and the second discharge control unit are controlled based on the second control signal, so as to convert the DC input voltage into a DC output voltage.

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