Frequency Adjustment Method of Switching Power Supply and Frequency Adjustment System of Switching Power Supply

Abstract

The present application discloses a frequency regulation method for a switching power supply and a frequency regulation system for a switching power supply, belonging to the technical field of switching power supplies. The frequency regulation method for the switching power supply includes: controlling the charge and discharge state of a target capacitor based on at least one of a front edge blanking signal, a sawtooth wave signal generated by the target capacitor in a working state, and a first electrical signal threshold; when the charge and discharge state of the target capacitor is a discharge state, regulating the discharge current of the target capacitor based on the sawtooth wave signal and an initial turning voltage to change the frequency of the switching power supply; when the charge and discharge state of the target capacitor is the discharge state, controlling the on-off state of a power tube based on the sawtooth wave signal, a load voltage, and a second electrical signal threshold. The frequency regulation method for the switching power supply in the present application can improve system stability and extend the service life of the device.

Description

Technical Field

[0001] This application belongs to the technical field of switching power supplies, and particularly relates to a frequency regulation method for a switching power supply and a frequency regulation system for a switching power supply. Background Art

[0002] The pulse frequency modulation curve of a switching power supply changes the switching frequency according to different loads, which can effectively improve the working efficiency. However, in the case of a large load, due to the influence of power frequency ripple and large ripple of the feedback voltage, when the switching period change rate is relatively fast, it will cause valley jumps at the same load point, affecting the service life of the device. In related technologies, a multiplexer is used to change the discharge current of the capacitor through the turning point of the feedback voltage, so that the switching period changes at different rates with the change of the feedback voltage under different loads. However, due to the output jitter problem of the comparator, the turning points of the rising and falling of the feedback voltage are different, which affects the valley distribution in the full load range and the normal operation of the device, thus affecting the service life of the device. Summary of the Invention

[0003] This application aims to solve at least one of the technical problems existing in the related technologies. For this purpose, this application provides a frequency regulation method for a switching power supply and a frequency regulation system for a switching power supply, which adaptively regulate the discharge rate of the target capacitor to realize the adaptive change of the switching period with the change speed of the sawtooth wave signal before and after the target turning point, improve the system stability, and extend the service life of the device.

[0004] In a first aspect, this application provides a frequency regulation method for a switching power supply, and the method includes:

[0005] Controlling the charge and discharge state of the target capacitor based on at least one of a front edge blanking signal, a sawtooth wave signal generated by the target capacitor in a working state, and a first electrical signal threshold; the charge and discharge state includes: a charging state or a discharging state; the front edge blanking signal is determined based on the feedback voltage of the load;

[0006] When the charge and discharge state of the target capacitor is the discharging state, adjusting the discharge current of the target capacitor based on the sawtooth wave signal and an initial turning voltage to change the frequency of the switching power supply;

[0007] When the charge and discharge state of the target capacitor is the discharging state, controlling the on-off state of a power transistor based on the sawtooth wave signal, a load voltage, and a second electrical signal threshold.

[0008] According to the frequency adjustment method of the switching power supply of the present application, by one or more of the leading edge blanking signal, the sawtooth wave signal generated by the target capacitor in the working state, and the first electrical signal threshold, the charge and discharge state of the target capacitor is controlled, and during the discharge process of the target capacitor, based on the sawtooth wave signal and the initial turning voltage, the discharge current is adjusted, so as to adaptively adjust the discharge rate of the target capacitor, thereby being able to solve the technical problem that the turning points of the load voltage rising and falling caused by the delay of the multiplexer affect the valley distribution in the full load range. On this basis, based on the turning point, the frequency of the switching power supply is adjusted, and the frequency of the switching power supply can be adaptively changed according to different loads, so as to realize the adaptive change of the switching period with the change speed of the sawtooth wave signal before and after the turning point, improve the system stability, and extend the service life of the equipment.

[0009] According to the frequency adjustment method of the switching power supply of the present application, when the charge and discharge state of the target capacitor is the discharge state, based on the sawtooth wave signal and the initial turning voltage, adjusting the discharge current of the target capacitor to change the frequency of the switching power supply includes:

[0010] When the sawtooth wave signal is greater than the initial turning voltage, adjusting the discharge current to a first current to change the frequency of the switching power supply;

[0011] When the sawtooth wave signal is not greater than the initial turning voltage, adjusting the discharge current to a second current to change the frequency of the switching power supply; wherein, the first current is greater than the second current, and the first switching power supply frequency corresponding to the first current is greater than the second switching power supply frequency corresponding to the second current.

[0012] According to the frequency adjustment method of the switching power supply of the present application, the frequency of the switching power supply is determined based on the following steps, including:

[0013] Obtain the working parameters of the target capacitor in the charging state and the working parameters in the discharging state at each acquisition moment within the target charge and discharge cycle respectively; the working parameters in the discharging state include: the first charge and the first current or the working parameters in the discharging state include: the second charge and the second current;

[0014] Based on the working parameters of the target capacitor in the charging state, the first charge and the first current of the target capacitor in the discharging state, obtain the first functional relationship between the sawtooth wave signal and the switching period;

[0015] Obtain a second functional relationship between the sawtooth wave signal and the switching period based on the operating parameters of the target capacitor in the charging state, the second charge of the target capacitor in the discharging state, and the second current;

[0016] Determine the frequency of the switching power supply based on the first functional relationship and the second functional relationship.

[0017] According to the frequency adjustment method of the switching power supply of the present application, in the case where the charge-discharge state of the target capacitor is the discharging state, controlling the on-off state of the power tube based on the sawtooth wave signal, the load voltage, and the second electrical signal threshold includes:

[0018] When the load voltage is greater than the second electrical signal threshold, obtain the pulse frequency signal based on the sawtooth wave signal and the load voltage;

[0019] When the load voltage is not greater than the second electrical signal threshold, obtain the pulse frequency signal based on the sawtooth wave signal and the second electrical signal threshold; when the pulse frequency signal is at a high level, control the power tube to conduct;

[0020] When the pulse frequency signal is at a low level, control the power tube to turn off.

[0021] According to the frequency adjustment method of the switching power supply of the present application, controlling the charge-discharge state of the target capacitor based on at least one of the front-edge blanking signal, the sawtooth wave signal generated by the target capacitor in the operating state, and the first electrical signal threshold includes:

[0022] When the front-edge blanking signal is at a low level, control the target capacitor to charge;

[0023] When the front-edge blanking signal is at a high level and the sawtooth wave signal is greater than the first electrical signal threshold, control the target capacitor to discharge.

[0024] In a second aspect, the present application provides a frequency adjustment system for a switching power supply based on the frequency adjustment method of the switching power supply as described in the first aspect. The system includes:

[0025] A pulse frequency modulation oscillator circuit, which is used to control the charge-discharge state of the target capacitor based on at least one of the front-edge blanking signal, the sawtooth wave signal generated by the target capacitor in the operating state, and the first electrical signal threshold;

[0026] A turning point adjustment circuit, the turning point adjustment circuit is connected to the pulse frequency modulation oscillator circuit; the turning point adjustment circuit is used to adjust the discharge current based on the sawtooth wave signal and the initial turning voltage in the state where the target capacitor is discharging, so as to change the frequency of the switching power supply;

[0027] A processing module, the processing module is respectively connected to the pulse frequency modulation oscillator circuit and the turning point adjustment circuit.

[0028] For the frequency adjustment system of the switching power supply according to the present application, by setting the pulse frequency modulation oscillator circuit, a sawtooth wave signal and its corresponding oscillation curve are effectively generated by controlling the charging and discharging states of the target capacitor; and by setting the turning point adjustment circuit connected to the pulse frequency modulation oscillator circuit, the discharge current before and after the initial turning voltage is effectively adjusted, so as to control the discharge time of the pulse frequency modulation oscillator circuit, so that the switching period and the slope of the sawtooth wave signal are different under light load and heavy load, thereby adaptively adjusting the frequency of the switching power supply.

[0029] In a third aspect, the present application provides a device for adjusting the frequency of a switching power supply, the device includes:

[0030] A first processing module, configured to control the charging and discharging state of the target capacitor based on at least one of a front edge blanking signal, a sawtooth wave signal generated by the target capacitor in the working state, and a first electrical signal threshold; the charging and discharging state includes: a charging state or a discharging state;

[0031] A second processing module, configured to adjust the discharge current of the target capacitor based on the sawtooth wave signal and the initial turning voltage to change the frequency of the switching power supply when the charging and discharging state of the target capacitor is the discharging state;

[0032] A third processing module, configured to control the on-off state of the power tube based on the sawtooth wave signal, the load voltage, and a second electrical signal threshold when the charging and discharging state of the target capacitor is the discharging state.

[0033] The frequency adjustment device of the switching power supply according to the present application controls the charging and discharging state of the target capacitor through one or more of the leading-edge blanking signal, the sawtooth wave signal generated by the target capacitor in the working state, and the first electrical signal threshold. During the discharging process of the target capacitor, the discharging current is adjusted based on the sawtooth wave signal and the initial turning voltage, so as to adaptively adjust the discharging rate of the target capacitor, thereby solving the technical problem that the turning points of the load voltage rising and falling caused by the delay of the one-bit data selector are different, affecting the valley distribution in the full load range. On this basis, the frequency of the switching power supply is adjusted based on the turning point, and the frequency of the switching power supply can be adaptively changed according to different loads, so as to realize the adaptive change of the switching period with the change speed of the sawtooth wave signal before and after the turning point, improve the system stability, and extend the service life of the device.

[0034] In a fourth aspect, the present application further provides a chip, which includes a processor and a communication interface. The communication interface is coupled to the processor. The processor is used to run programs or instructions. When the processor executes the programs or instructions, the frequency adjustment method of the switching power supply as described in the first aspect is implemented.

[0035] In a fifth aspect, the present application provides an electronic device, which includes a memory, a processor, and a computer program stored on the memory and executable on the processor. When the processor executes the computer program, the frequency adjustment method of the switching power supply as described in the first aspect above is implemented.

[0036] In a sixth aspect, the present application provides a non-transitory computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, the frequency adjustment method of the switching power supply as described in the first aspect above is implemented.

[0037] In a seventh aspect, the present application provides a computer program product, which includes a computer program. When the computer program is executed by a processor, the frequency adjustment method of the switching power supply as described in the first aspect above is implemented.

[0038] One or more of the above technical solutions in the embodiments of the present application have at least one of the following technical effects:

[0039] Control the charging and discharging state of the target capacitor through one or more of the front-edge blanking signal, the sawtooth wave signal generated by the target capacitor in the working state, and the first electrical signal threshold. During the discharging process of the target capacitor, adjust the discharging current based on the sawtooth wave signal and the initial turning voltage, so as to adaptively adjust the discharging rate of the target capacitor, thereby solving the technical problem that the turning points of the load voltage rising and falling caused by the delay of the one-bit data selector are different, affecting the valley distribution in the full load range. On this basis, adjust the frequency of the switching power supply based on the turning point, and can adaptively change the frequency of the switching power supply according to different loads, so as to realize the adaptive transition of the switching period before and after the turning point with the change speed of the sawtooth wave signal, improve the system stability, and extend the service life of the device.

[0040] Furthermore, by setting a pulse frequency modulation oscillator circuit, effectively generate a sawtooth wave signal and its corresponding oscillation curve by controlling the charging and discharging state of the target capacitor; and by setting a turning point adjustment circuit connected to the pulse frequency modulation oscillator circuit, effectively adjust the discharging current before and after the initial turning voltage, so as to control the discharging time of the pulse frequency modulation oscillator circuit, so as to achieve different slopes of the switching period and the sawtooth wave signal under light load and heavy load, thereby adaptively adjusting the frequency of the switching power supply.

[0041] Even further, by setting a turning point adjustment circuit, effectively adjust the discharging current of the target capacitor based on the correlation between the sawtooth wave signal generated by the pulse frequency modulation oscillator circuit and the initial turning voltage, so as to adaptively adjust the discharging time of the target capacitor. The structure is simple and easy to implement, and the cost is low.

[0042] Additional aspects and advantages of the present application will be given in part in the following description, become apparent in part from the following description, or be learned through the practice of the present application. Description of the Drawings

[0043] The above and / or additional aspects and advantages of the present application will become apparent and easy to understand from the description of the embodiments in conjunction with the following drawings, where:

[0044] Figure 1 is a schematic flowchart of the method for adjusting the frequency of the switching power supply provided by the embodiment of the present application;

[0045] Figure 2 is one of the schematic structural diagrams of the system for adjusting the frequency of the switching power supply provided by the embodiment of the present application;

[0046] Figure 3 is one of the schematic principle diagrams of the method for adjusting the frequency of the switching power supply provided by the embodiment of the present application;

[0047] Figure 4It is the second structural schematic diagram of the frequency regulation system of the switching power supply provided by the embodiment of the present application;

[0048] Figure 5 It is the second principle schematic diagram of the frequency regulation method of the switching power supply provided by the embodiment of the present application;

[0049] Figure 6 It is the third principle schematic diagram of the frequency regulation method of the switching power supply provided by the embodiment of the present application;

[0050] Figure 7 It is the fourth principle schematic diagram of the frequency regulation method of the switching power supply provided by the embodiment of the present application;

[0051] Figure 8 It is the fifth principle schematic diagram of the frequency regulation method of the switching power supply provided by the embodiment of the present application;

[0052] Figure 9 It is the structural schematic diagram of the frequency regulation device of the switching power supply provided by the embodiment of the present application;

[0053] Figure 10 It is the structural schematic diagram of the electronic device provided by the embodiment of the present application.

[0054] Reference numerals: Pulse frequency modulation oscillator circuit 210; First current source 211; First switching tube 212;

[0055] First capacitor 213; First comparator 214; First logic control module 215; First inverter 215-1;

[0056] First reset-set flip-flop 215-2; Second inverter 215-3; Third inverter 215-4;

[0057] Fourth inverter 215-5; Fifth inverter 215-6;

[0058] Turning point adjustment circuit 220; Second switching tube 221; First amplifier 222; Second current source 223;

[0059] Third current source 224; Fourth current source 225;

[0060] Pulse frequency modulation signal generation circuit 230; Second comparator 231; Third nor gate 232;

[0061] Second set-reset flip-flop 233; Sixth inverter 234; Two-to-one selector 240. Detailed implementation manners

[0062] Next, the technical solutions in the embodiments of the present application will be clearly described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art belong to the scope of protection of the present application.

[0063] The terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects, rather than to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so that the embodiments of the present application can be implemented in an order other than those illustrated or described herein, and the objects distinguished by "first", "second", etc. are generally of the same type, and the number of objects is not limited. For example, the first object can be one or multiple. In addition, "and / or" in the specification and claims means at least one of the connected objects, and the character " / " generally indicates an "or" relationship between the associated objects before and after.

[0064] Next, in conjunction with the accompanying drawings, the frequency adjustment method of the switching power supply, the frequency adjustment system of the switching power supply, the frequency adjustment device of the switching power supply, the chip, and the readable storage medium provided by the embodiments of the present application will be described in detail through specific embodiments and their application scenarios.

[0065] Among them, the frequency adjustment method of the switching power supply can be applied to a terminal, and specifically can be executed by hardware or software in the terminal.

[0066] The terminal includes, but is not limited to, portable communication devices such as mobile phones or tablets. It should also be understood that in some embodiments, the terminal may not be a portable communication device, but a desktop computer.

[0067] In the following various embodiments, a terminal including a display and a touch-sensitive surface is described. However, it should be understood that the terminal may include one or more other physical user interface devices such as a physical keyboard, a mouse, and a joystick.

[0068] The frequency adjustment method of the switching power supply provided by the embodiments of the present application, the execution subject of the frequency adjustment method of the switching power supply can be an electronic device or a functional module or functional entity in the electronic device that can implement the frequency adjustment method of the switching power supply. The electronic devices mentioned in the embodiments of the present application include, but are not limited to, mobile phones, tablets, computers, cameras, and wearable devices, etc. Hereinafter, taking the electronic device as the execution subject as an example, the frequency adjustment method of the switching power supply provided by the embodiments of the present application will be described.

[0069] As Figure 1 shown, the frequency adjustment method of the switching power supply includes: step 110, step 120, and step 130.

[0070] The frequency adjustment method of the switching power supply can be applied to Figure 2 the frequency adjustment system of the switching power supply as shown.

[0071] The frequency adjustment system of the switching power supply includes: a pulse frequency modulation oscillator circuit, a turning point adjustment circuit, and a processing module.

[0072] The specific connection method of the frequency adjustment system of the switching power supply will be described in detail below and will not be elaborated here for the time being.

[0073] The frequency adjustment method of the switching power supply can be applied to the field of pulse frequency adjustment of the switching power supply.

[0074] Step 110: Control the charge and discharge state of the target capacitor based on at least one of the front edge blanking signal, the sawtooth wave signal generated by the target capacitor in the working state, and the first electrical signal threshold; the charge and discharge state includes: a charging state or a discharging state;

[0075] In this step, the target capacitor is the capacitor that charges and discharges in the circuit.

[0076] The front edge blanking signal is the reset signal of the circuit where the sawtooth wave signal is generated, and the front edge blanking signal can be expressed as leb.

[0077] The front edge blanking signal is determined based on the feedback voltage of the load.

[0078] In the actual execution process, the front edge blanking signal can be determined based on the sawtooth wave signal and the feedback voltage (FB) corresponding to the load.

[0079] The sawtooth wave signal is the signal generated by the target capacitor during the charge and discharge process, and can be expressed as Vsaw.

[0080] The front edge blanking signal changes correspondingly based on the change of the feedback voltage of the load.

[0081] It can be understood that in the case where the voltage corresponding to the sawtooth wave signal is lower than the feedback voltage corresponding to the load, the front edge blanking signal will change.

[0082] In the descending stage of the sawtooth wave signal, the voltage corresponding to the sawtooth wave signal and the feedback voltage corresponding to the load can be compared. In the case where the voltage corresponding to the sawtooth wave signal is lower than the feedback voltage corresponding to the load, the sawtooth wave signal is directly pulled down to end this cycle.

[0083] The frequency adjustment system of the switching power supply starts the next charge and discharge cycle based on the issued leb signal.

[0084] The working state means that the target voltage is in the charge and discharge state or not in the charge and discharge state.

[0085] The first electrical signal threshold is a preset value for controlling the charge and discharge state of the target capacitor.

[0086] In the actual execution process, the first electrical signal threshold is the feedback voltage value corresponding to the minimum switching period.

[0087] In the actual execution process, the charge and discharge state of the target capacitor can be controlled based on the correlation between the leading edge blanking signal, the sawtooth wave signal generated by the target capacitor in the working state, and the first electrical signal threshold.

[0088] In some embodiments, step 110 may further include:

[0089] When the leading edge blanking signal is at a low level, control the target capacitor to charge;

[0090] When the leading edge blanking signal is at a high level and the sawtooth wave signal is greater than the first electrical signal threshold, control the target capacitor to discharge.

[0091] In this embodiment, in the actual execution process, when the leading edge blanking signal is at a low level, the control circuit charges the target capacitor. During the charging process of the target capacitor, a sawtooth wave signal is generated and the sawtooth wave signal gradually rises.

[0092] When the value that the sawtooth wave signal rises to is greater than the first electrical signal threshold, the leading edge blanking signal changes to a high level. At this time, control the target capacitor to start discharging.

[0093] Such as Figure 2 As shown, when the leading edge blanking signal is at a low level, PM0 is turned on, NM0 is turned off, and I0 charges C0 (i.e., the target capacitor). At this time, the sawtooth wave signal gradually rises.

[0094] The sawtooth wave signal serves as the positive input terminal of the comparator CMP1 and is compared with the first electrical signal threshold. When the sawtooth wave signal is greater than the first electrical signal threshold, the output of the CMP1 comparator is at a high level, PM0 is turned off, NM0 is turned on, and the first capacitor (i.e., the target capacitor) starts to discharge.

[0095] According to the frequency adjustment method of the switching power supply provided by the embodiments of the present application, the target capacitor is controlled to charge through the leading edge blanking signal. During the charging process, continuously judge the relationship between the sawtooth wave signal and the first electrical signal threshold. When the sawtooth wave signal is greater than the first electrical signal threshold, control the target capacitor to discharge. The control logic is simple and the operation is convenient.

[0096] Step 120: When the charge and discharge state of the target capacitor is in the discharge state, based on the sawtooth wave signal and the initial turning voltage, adjust the discharge current of the target capacitor to change the frequency of the switching power supply;

[0097] In this step, the initial turning voltage is a preset value compared with the sawtooth wave signal during the process of adjusting the discharge current, and the initial turning voltage can be expressed as VFB_turn.

[0098] The specific value of the initial turning voltage can be determined based on the actual situation, and this application does not make any limitations.

[0099] In some embodiments, based on the sawtooth wave signal and the initial turning voltage, adjusting the discharge current of the target capacitor may further include:

[0100] Based on the magnitudes of the sawtooth wave signal and the initial turning voltage, adjust the magnitude of the discharge current of the target capacitor, so that when the sawtooth wave signal is larger, the discharge current is increased, the falling slope of the sawtooth wave signal is increased, and thus the switching period is shortened (i.e., the switching period and the slope of the load voltage are gentle), thereby changing the frequency of the switching power supply.

[0101] During the actual execution process, when it is determined that the value of the sawtooth wave signal at the current acquisition moment is greater than the first electrical signal threshold, the target capacitor can be controlled to start discharging, and the discharge rate of the target capacitor can be determined based on the correlation between the sawtooth wave signal and the initial turning voltage. Based on different correlation relationships, the speed of adjusting the discharge current of the target capacitor is adjusted.

[0102] Step 130: When the charge and discharge state of the target capacitor is the discharge state, control the on-off state of the power transistor based on the sawtooth wave signal, the load voltage, and the second electrical signal threshold.

[0103] In this step, the sawtooth wave signal is the sawtooth wave signal corresponding to the discharge current after adjusting the discharge current.

[0104] It can be understood that the sawtooth wave signal changes based on the change of the discharge current.

[0105] The load voltage is the voltage corresponding to the load that the switching power supply needs to control.

[0106] The load voltage can be expressed as VFB.

[0107] The second electrical signal threshold is the feedback voltage value corresponding to the maximum switching period.

[0108] During the actual execution process, the on or off state of the power transistor can be controlled by adjusting the correlation between the voltage corresponding to the sawtooth wave signal after adjusting the discharge current, the load voltage, and the second electrical signal threshold.

[0109] It can be understood that during the actual application process, the load voltage varies between the first electrical signal threshold and the second electrical signal threshold. After the initial turning voltage, the slope of the sawtooth wave signal becomes lower. Whether the feedback voltage corresponding to the load moves up or down will cause a change in the correlation between the feedback voltage corresponding to the load and the entire switching cycle, thereby obtaining the Figure 3 pulse frequency modulation curve as shown.

[0110] It can be understood that by distinguishing the slope of dTpfm / dVFB under light load and heavy load, that is, dTpfm / dVFB is larger under light load, and Tpfm changes faster with VFB; dTpfm / dVFB is smaller under heavy load, and Tpfm changes slower with VFB, thus solving the problem of valley jumping due to power frequency ripple under heavy load.

[0111] The frequency regulation method of the switching power supply can adjust the discharge current in the discharge state, change the discharge time, and thus adjust the pulse frequency of the switching power supply.

[0112] According to the frequency regulation method of the switching power supply provided by the embodiments of the present application, through one or more of the front edge blanking signal, the sawtooth wave signal generated by the target capacitor in the working state, and the first electrical signal threshold, the charge and discharge state of the target capacitor is controlled, and during the discharge process of the target capacitor, based on the sawtooth wave signal and the initial turning voltage, the discharge current is adjusted, thereby adaptively adjusting the discharge rate of the target capacitor, and thus being able to solve the technical problem that the turning points of the load voltage rising and falling are different due to the delay of the one-bit data selector, affecting the valley distribution in the full load range. On this basis, based on the turning point, the frequency of the switching power supply is regulated, and the frequency of the switching power supply can be adaptively changed based on the different loads, thereby realizing the adaptive change of the switching cycle with the change speed of the sawtooth wave signal before and after the turning point, improving the system stability, and extending the service life of the device.

[0113] In some embodiments, step 130 may further include:

[0114] When the load voltage is greater than the second electrical signal threshold, based on the sawtooth wave signal and the load voltage, a pulse frequency signal is obtained;

[0115] When the load voltage is not greater than the second electrical signal threshold, based on the sawtooth wave signal and the second electrical signal threshold, a pulse frequency signal is obtained;

[0116] When the pulse frequency signal is at a high level, control the power transistor to conduct;

[0117] When the pulse frequency signal is at a low level, control the power transistor to turn off.

[0118] In this embodiment, the pulse frequency signal is a signal for controlling the on / off state of the power transistor.

[0119] The pulse frequency signal can be expressed as pfm.

[0120] As Figure 2 shown, during the actual execution process, the comparator can compare the correlation between the sawtooth wave signal, the load voltage, and the second electrical signal threshold to obtain the pulse signal frequency, and then control the on / off state of the power transistor based on the pulse signal frequency.

[0121] During the actual execution process, the multiplexer 240 can compare the load voltage and the second electrical signal threshold so that the multiplexer 240 outputs the relatively larger value between the load voltage and the second electrical signal threshold.

[0122] When the multiplexer 240 determines that the load voltage is greater than the second electrical signal threshold, the multiplexer 240 outputs the load voltage to the comparator. The comparator outputs the Vo2 signal based on the sawtooth wave signal and the load voltage, thereby determining the pulse frequency signal.

[0123] During the actual execution process, when the sawtooth wave signal is lower than the load voltage, the leading edge blanking signal will change, and the leading edge blanking signal will control the entire charge / discharge cycle to end prematurely.

[0124] During the actual execution process, when the load voltage is greater than the initial transition voltage, the waveform of the sawtooth wave signal, the pulse frequency signal, and the discharge cycle are as Figure 6 shown.

[0125] During the actual execution process, when the load voltage is not greater than the initial transition voltage, the waveform of the sawtooth wave signal, the waveform of the pulse frequency signal, and the discharge cycle are as Figure 7 shown.

[0126] When the multiplexer 240 determines that the load voltage is not greater than the second electrical signal threshold, the multiplexer 240 outputs the second electrical signal threshold to the comparator. The comparator outputs the Vo2 signal based on the sawtooth wave signal and the second electrical signal threshold, thereby determining the pulse frequency signal.

[0127] During the actual execution process, when the load voltage is not greater than the second electrical signal threshold, since the second electrical signal threshold is less than the initial transition voltage, the load voltage is less than the initial transition voltage, and thus the waveform of the sawtooth wave signal, the waveform of the pulse frequency signal, and the discharge cycle are as Figure 8 shown.

[0128] By comparing the updated sawtooth wave signal with the load voltage, when the updated sawtooth wave signal is lower than the load voltage, the charge-discharge cycle is ended in advance. By having different slopes of the sawtooth wave signal before and after the initial turning point, the upward and downward shifts of the load voltage in the time domain are changed, thereby causing the entire switching cycle of the load to change to achieve based on the load switching frequency.

[0129] Continue to refer to Figure 2 , by comparing the correlation between the sawtooth wave signal, the load voltage, and the second electrical signal threshold, the comparator will output the Vo2 signal, which is used as the first input terminal of the NOR gate NOR3, and the pfm_chr signal is used as the second input terminal of the NOR gate NOR3 to ensure that the pfm signal is high only during the discharge time of the target capacitor C0. The NOR gate NOR3 outputs the set signal. The set signal is the set signal of the RS flip-flop 2 composed of the NOR gates NOR4 and NOR5, and the pfm_chr is the reset signal of the RS flip-flop 2. Finally, the set signal and the pfm_chr signal pass through the RS flip-flop 2 and the inverter INV6 to obtain the pfm signal.

[0130] According to the frequency adjustment method of the switching power supply provided by the embodiments of the present application, by comparing the correlation between the sawtooth wave signal, the load voltage, and the second electrical signal threshold, the pulse frequency signal can be effectively obtained. Thus, based on the level of the pulse frequency signal, the conduction or cut-off of the power transistor is controlled, and the control logic is simple and easy to operate.

[0131] In some embodiments, step 120 may further include:

[0132] When the sawtooth wave signal is greater than the initial turning voltage, the discharge current is adjusted to the first current to change the frequency of the switching power supply;

[0133] When the sawtooth wave signal is not greater than the initial turning voltage, the discharge current is adjusted to the second current to change the frequency of the switching power supply; wherein, the first current is greater than the second current, and the first switching power supply frequency corresponding to the first current is greater than the second switching power supply frequency corresponding to the second current.

[0134] In this embodiment, the first current is the current that controls the increase in the discharge rate of the target capacitor after determining that the sawtooth wave signal is greater than the initial turning voltage.

[0135] The second current is the current that controls the target capacitor to discharge at a normal rate after determining that the sawtooth wave signal is not greater than the initial turning voltage.

[0136] The specific values of the first current and the second current can be determined based on the circuit connection method.

[0137] The frequency of the first switching power supply is the frequency determined when the frequency regulation system of the switching power supply operates at the operating parameters corresponding to the first current.

[0138] The frequency of the second switching power supply is the frequency determined when the frequency regulation system of the switching power supply operates at the operating parameters corresponding to the second current.

[0139] During the actual execution process, when it is determined that the sawtooth wave signal is greater than the first electrical signal threshold, the control of the target capacitor starts to discharge. During the discharging process, the correlation between the sawtooth wave signal and the initial turning voltage is further compared.

[0140] When the sawtooth wave signal is greater than the initial turning voltage, the discharging rate of the target capacitor is increased, and the discharging rate of the target capacitor is adjusted to the first current to control the power tube based on the first switching power supply frequency corresponding to the first current.

[0141] When the sawtooth wave signal is not greater than the initial turning voltage, the target capacitor discharges at a normal rate. At this time, the discharging rate of the target capacitor is the second current, and the power tube is controlled based on the second switching power supply frequency corresponding to the second current.

[0142] It can be understood that increasing the discharging rate of the target capacitor is based on the discharging rate corresponding to the second current, and the discharging rate of the target capacitor is increased, that is, the discharging rate corresponding to the first current is greater than the discharging rate corresponding to the second current.

[0143] During the actual execution process, different discharging currents have different operating parameters, and the correlation between the switching period and each operating parameter can be determined based on the operating parameters.

[0144] The following describes the determination of the correlation between the switching period and each operating parameter under different discharging currents.

[0145] In some embodiments, the frequency of the switching power supply is determined based on the following steps:

[0146] Obtain the operating parameters of the target capacitor in the charging state and the operating parameters in the discharging state at each acquisition moment within the target charge-discharge period respectively;

[0147] Based on the operating parameters of the target capacitor in the charging state, the first charge of the target capacitor in the discharging state, and the first current, obtain the first functional relationship between the sawtooth wave signal and the switching period;

[0148] Based on the operating parameters of the target capacitor in the charging state, the second charge of the target capacitor in the discharging state, and the second current, obtain the second functional relationship between the sawtooth wave signal and the switching period;

[0149] Determine the frequency of the switching power supply based on the first functional relationship and the second functional relationship. In this embodiment, the target charge-discharge cycle is the cycle duration during the charge-discharge process of the target capacitor.

[0150] The operating parameters in the discharge state are the operating parameters of the circuit during the discharge process of the target capacitor.

[0151] The operating parameters in the discharge state include: the first charge and the first current, or the operating parameters in the discharge state include: the second charge and the second current.

[0152] The operating parameters in the charging state are the operating parameters of the circuit during the charging process of the target capacitor.

[0153] The operating parameters in the charging state include: the third charge and the third current.

[0154] In the actual execution process, during the charge-discharge process of the target capacitor, the operating parameters of the circuit in each state are collected in real time, that is, the operating parameters of the target capacitor in the charging state and the operating parameters in the discharge state are collected in real time.

[0155] In some embodiments, obtaining the operating parameters of the target capacitor in the discharge state at each acquisition moment within the target charge-discharge cycle may further include:

[0156] Obtain the first charge and the first current of the target capacitor when the target capacitor discharges based on the first current;

[0157] Obtain the second charge and the second current of the target capacitor when the target capacitor discharges based on the second current.

[0158] In this embodiment, the first charge is the electric charge amount corresponding to the target capacitor when the target capacitor discharges at the discharge rate corresponding to the first current.

[0159] The second charge is the electric charge amount corresponding to the target capacitor when the target capacitor discharges at the discharge rate corresponding to the second current.

[0160] The first current is the current value corresponding to the target capacitor during the discharge process with the first current.

[0161] The second current is the current value corresponding to the target capacitor during the discharge process with the second current.

[0162] In the actual execution process, the first charge, the first current, the second charge, and the second current of the target capacitor can be collected through instruments corresponding to the operating parameters such as collecting the charge value and the current value.

[0163] Continue to refer to Figure 2, when the sawtooth wave signal is greater than the initial turning voltage, output current I2, and obtain I3 through current mirroring to get the first current.

[0164] The first current can be determined based on the following formula:

[0165] Isink1 = I1 + K * I2

[0166] Where, Isink1 is the first current, I1 is the current corresponding to the second current source, and I2 is the current corresponding to the third current source.

[0167] When the sawtooth wave signal is not greater than the initial turning voltage, the transconductance amplifier GM1 gradually turns off the current I2 according to the difference between the sawtooth wave signal and the initial turning voltage until I2 = 0, then at this time I3 = 0, and the second current is obtained.

[0168] The second current can be determined based on the following formula:

[0169] Isink2 = I1

[0170] Where, Isink2 is the second current, and I1 is the current corresponding to the second current source.

[0171] During the actual execution process, after obtaining the first current and the second current, the discharge rates corresponding to the first current and the second current can be calculated.

[0172] The discharge rate corresponding to the first current can be determined based on the following formula:

[0173]

[0174] Where, dVsaw represents the integration of the sawtooth wave signal, dTpfm _dis represents the integration of the discharge period, Isink1 is the first current, I1 is the current corresponding to the second current source, I2 is the current corresponding to the third current source, and C1 is the first charge of the target capacitor.

[0175] The discharge rate corresponding to the second current can be determined based on the following formula:

[0176]

[0177] Where, dVsaw represents the integration of the sawtooth wave signal, dTpfm _dis represents the integration of the discharge period, Isink2 is the second current, I1 is the current corresponding to the second current source, and C2 is the second charge of the target capacitor.

[0178] According to the frequency adjustment method of the switching power supply provided by the embodiments of the present application, by collecting the charge amount and current value of the target capacitor at different discharge rates, the operating parameters of the circuit are effectively obtained, providing data support for subsequent adaptive frequency adjustment.

[0179] In some embodiments, obtaining the operating parameters of the target capacitor in the charging state at each acquisition moment within the target charge-discharge cycle may further include:

[0180] Obtaining the third current of the target capacitor in the charging state and the third charge of the target capacitor.

[0181] In this embodiment, the third current is the current value of the target capacitor during the charging process.

[0182] The third charge is the charge amount of the target capacitor during the charging process.

[0183] In the actual execution process, by collecting the instruments corresponding to the operating parameters such as the charge value and the acquisition current value, the charge amount and current value of the target capacitor in the charging state are collected.

[0184] According to the frequency adjustment method of the switching power supply provided by the embodiments of the present application, by collecting the charge amount and current value of the target capacitor in the charging state, the operating parameters of the circuit are effectively obtained, providing data support for subsequent adaptive frequency adjustment.

[0185] In some embodiments, a target relational expression may be determined based on the operating parameters in the charging state and the operating parameters in the discharging state;

[0186] In this embodiment, the target relational expression is the relational expression between the switching period and the voltage corresponding to the sawtooth wave signal.

[0187] In the actual execution process, after obtaining the operating parameters in the charging state and the operating parameters in the discharging state, the correlation between the sawtooth wave signal and the switching period may be calculated based on the obtained operating parameters corresponding to different discharge currents, and thus the target relational expression may be determined based on the correlation.

[0188] The first functional relational expression is the functional relational expression between the sawtooth wave signal and the switching period determined when the voltage corresponding to the sawtooth wave signal is less than or equal to the initial turning voltage.

[0189] The second functional relational expression is the functional relational expression between the sawtooth wave signal and the switching period determined when the voltage corresponding to the sawtooth wave signal is greater than the initial turning voltage.

[0190] In the actual execution process, the first functional relational expression may be determined based on the following formula:

[0191]

[0192] Among them, Vref is the first electrical signal threshold, VFB_dV is the second electrical signal threshold, I0 is the third current, I1 is the current corresponding to the second current source, I2 is the current corresponding to the third current source, C1 is the first charge of the target capacitor, C3 is the third charge of the target capacitor, and K is the target ratio.

[0193] Among them, the second electrical signal threshold is the feedback voltage value corresponding to the maximum switching period.

[0194] During the actual execution process, the second functional relationship can be determined based on the following formula:

[0195]

[0196] Among them, Vref is the first electrical signal threshold, VFB_dV is the second electrical signal threshold, I0 is the third current, I1 is the current corresponding to the second current source, C2 is the second charge of the target capacitor, and C3 is the third charge of the target capacitor.

[0197] After obtaining the first functional relationship and the second functional relationship, the pulse frequency modulation curve as shown in Figure 3 can be determined based on the first functional relationship and the second functional relationship.

[0198] It can be understood that based on the first functional relationship and the second functional relationship, the switching period can be expressed as follows:

[0199]

[0200] Among them, Tpfm is the switching period, Tpfm_ chr is the charging period, Tpfm_ dis is the discharging period, Vref is the first electrical signal threshold, VFB_dV is the second electrical signal threshold, I0 is the third current, I1 is the current corresponding to the second current source, I2 is the current corresponding to the third current source, C1 is the first charge of the target capacitor, C2 is the second charge of the target capacitor, C3 is the third charge of the target capacitor, and K is the target ratio.

[0201] Based on the obtained first functional relationship, second functional relationship, and the correlation between the switching period and the frequency, the first switching power supply frequency can be calculated based on the first functional relationship, and the second switching power supply frequency can be calculated based on the second functional relationship. Subsequently, the frequency of the switching power supply can be changed based on the first switching power supply frequency and the second switching power supply frequency.

[0202] Based on the formula corresponding to the above switching period, it can be obtained that when the load is small (i.e., light load), Vsaw ≤ VFB_turn, and the rate of change of Tpfm with Vsaw is relatively fast. When the load is large (i.e., medium load), Vsaw > VFB_turn, and the rate of change of Tpfm with Vsaw is relatively slow, realizing a Figure 3 pulse frequency modulation curve.

[0203] According to the frequency regulation method of the switching power supply provided by the embodiments of the present application, by comparing the relationship between the sawtooth wave signal and the initial turning voltage during the discharge process, the discharge current before and after the initial turning voltage is adaptively regulated, so as to adaptively regulate the discharge rate of the target capacitor. The judgment logic is simple and the operation is convenient, improving the efficiency of discharge current regulation.

[0204] As Figure 2 shown, the embodiments of the present application also provide a frequency regulation system of a switching power supply based on the frequency regulation method of the switching power supply described in any of the above embodiments.

[0205] The frequency regulation system of the switching power supply includes: a pulse frequency modulation oscillator circuit 210, a turning point regulation circuit 220, and a processing module.

[0206] In this embodiment, as Figure 4 shown, the pulse frequency modulation oscillator circuit 210 is used to control the charge and discharge state of the target capacitor based on at least one of the front edge blanking signal, the sawtooth wave signal generated by the target capacitor in the working state, and the first electrical signal threshold.

[0207] The pulse frequency modulation oscillator circuit 210 generates a sawtooth wave signal by controlling the charge and discharge state of the target capacitor.

[0208] The turning point regulation circuit 220 is connected to the pulse frequency modulation oscillator circuit 210.

[0209] The turning point regulation circuit 220 is used to regulate the discharge current to change the frequency of the switching power supply based on the sawtooth wave signal and the initial turning voltage in the discharge state of the target capacitor.

[0210] The processing module is respectively connected to the pulse frequency modulation oscillator circuit 210 and the turning point regulation circuit 220.

[0211] The processing module is used to process the data in the pulse frequency modulation oscillator circuit 210 and the turning point regulation circuit 220.

[0212] According to the frequency regulation system of the switching power supply provided by the embodiments of the present application, by setting the pulse frequency modulation oscillator circuit 210, a sawtooth wave signal and its corresponding oscillation curve are effectively generated by controlling the charge and discharge state of the target capacitor; and by setting the turning point adjustment circuit 220 connected to the pulse frequency modulation oscillator circuit 210, the discharge current before and after the initial turning voltage is effectively adjusted, so as to control the discharge time of the pulse frequency modulation oscillator circuit 210, so that the switching period and the slope of the sawtooth wave signal are different under light load and heavy load, thereby adaptively adjusting the frequency of the switching power supply.

[0213] Continue to refer to Figure 2 , in some embodiments, the pulse frequency modulation oscillator circuit 210 may further include: a first current source 211, a first switching transistor 212, a first capacitor 213, a first comparator 214, and a first logic control module 215.

[0214] In this embodiment, the input terminal of the first current source 211 is connected to a voltage.

[0215] For example, as Figure 2 shown, the input terminal of the first power supply is connected to AVDD.

[0216] The source of the first switching transistor 212 is connected to the output terminal of the first current source 211.

[0217] The input terminal of the first capacitor 213 is connected to the drain of the first switching transistor 212.

[0218] The output terminal of the first capacitor 213 is grounded.

[0219] The positive input terminal of the first comparator 214 is connected to the drain of the first switching transistor 212.

[0220] The negative input terminal of the first comparator 214 is connected to the first electrical signal threshold.

[0221] In the actual execution process, the first comparator 214 may be Figure 2 CMP1 in

[0222] The input terminal of the first logic control module 215 is connected to the output terminal of the first comparator 214.

[0223] The output terminal of the first logic control module 215 is connected to the gate of the first switching transistor 212.

[0224] In some embodiments, the pulse frequency modulation oscillator circuit 210 may further include: a third switching transistor.

[0225] In this embodiment, the source of the third switching transistor is connected to the output terminal of the first capacitor 213.

[0226] The drain of the third switching transistor is connected to the drain of the first switching transistor 212.

[0227] The gate of the third switching transistor is connected to the first reset signal.

[0228] The first reset signal can be expressed as lebb.

[0229] During the actual execution process, the lebb signal resets the sawtooth wave signal through the third switching transistor, and the first current source 211 recharges the first capacitor 213. This process repeats to generate the sawtooth wave signal.

[0230] According to the frequency adjustment system of the switching power supply provided by the embodiments of the present application, by connecting the positive input terminal of the first comparator 214 to the sawtooth wave signal and connecting the negative input terminal of the first comparator 214 to the first electrical signal threshold, the charging and discharging states of the target capacitor are effectively controlled based on the output of the first comparator 214 and the first logic control module 215. The control logic is simple and the operation is convenient.

[0231] In some embodiments, the first logic control module 215 may further include: a first inverter 215-1, a first reset-set flip-flop 215-2, a second inverter 215-3, a third inverter 215-4, a fourth inverter 215-5, and a fifth inverter 215-6.

[0232] In this embodiment, the input terminal of the first inverter 215-1 is connected to the front edge blanking signal.

[0233] The input terminals of the first reset-set flip-flop 215-2 are respectively connected to the output terminal of the first inverter 215-1 and the output terminal of the first comparator 214.

[0234] The input terminal of the second inverter 215-3 is connected to the output terminal of the first reset-set flip-flop 215-2.

[0235] The input terminal of the third inverter 215-4 is connected to the output terminal of the second inverter 215-3.

[0236] The output terminal of the third inverter 215-4 is connected to the gate of the first switching transistor 212.

[0237] The input terminal of the fourth inverter 215-5 is connected to the output terminal of the second inverter 215-3.

[0238] The input terminal of the fifth inverter 215-6 is connected to the output terminal of the fourth inverter 215-5.

[0239] The fifth inverter 215-6 outputs the first pulse frequency modulation signal.

[0240] During the actual execution process, the charging and discharging states of the target capacitor can be jointly controlled based on the front edge blanking signal and the output of the first comparator 214.

[0241] According to the frequency regulation method of the switching power supply provided by the embodiments of the present application, by setting the first logic control module 215, logical judgment is effectively performed based on the front edge blanking signal and the output of the first comparator 214. Thus, based on the output result of the first logic control module 215, the conduction or disconnection of the first switching transistor 212 is controlled, thereby controlling the charging and discharging states of the target capacitor.

[0242] In some embodiments, the first reset - set flip - flop 215 - 2 may further include: a first NOR gate and a second NOR gate.

[0243] In this embodiment, the first input port of the first NOR gate is connected to the output terminal of the first inverter 215 - 1.

[0244] The output port of the first NOR gate is connected to the input port of the second inverter 215 - 3.

[0245] The first input terminal of the second NOR gate is connected to the output terminal of the first NOR gate.

[0246] The second input terminal of the second NOR gate is connected to the output terminal of the first comparator 214.

[0247] The output terminal of the second NOR gate is connected to the second input terminal of the first NOR gate.

[0248] According to the frequency regulation system of the switching power supply provided by the embodiments of the present application, by setting the first reset - set flip - flop 215 - 2 in the first logic control module 215, in the case of faults and errors in the frequency regulation system of the switching power supply, the entire system is restored to the initial state using the reset signal, and by controlling the set and reset signals, the output state of the flip - flop is flexibly changed, achieving precise control of the circuit behavior and improving the stability of the system.

[0249] In some embodiments, the turning - point adjustment circuit 220 may further include: a second switching transistor 221, a first amplifier 222, a second current source 223, a third current source 224, and a fourth current source 225.

[0250] In this embodiment, the drain of the second switching transistor 221 is connected to the drain of the first switching transistor 212.

[0251] The gate of the second switching transistor 221 is connected to the output terminal of the first logic control module 215.

[0252] The positive input terminal of the first amplifier 222 is connected to the drain of the first switching transistor 212.

[0253] The negative input terminal of the first amplifier 222 is connected to the initial turning voltage.

[0254] The input terminal of the second current source 223 is connected to the source electrode of the second switching transistor 221.

[0255] The output terminal of the second current source 223 is grounded.

[0256] During the discharging process of the target capacitor, the second current source 223 is in the on state.

[0257] The input terminal of the third current source 224 is connected to the output terminal of the first amplifier 222.

[0258] The output terminal of the third current source 224 is grounded.

[0259] The input terminal of the fourth current source 225 is connected to the source electrode of the second switching transistor 221.

[0260] The output terminal of the fourth current source 225 is grounded.

[0261] The fourth current source 225 and the third current source 224 are mirrored based on the target ratio.

[0262] For example, during the actual execution process, as Figure 2 shown, when the leading edge blanking signal is at a low level, pfm_chr = 1, Vctr = 0, the first switching transistor 212 is turned on, the second switching transistor 221 is turned off, the first current source 211 charges the first capacitor 213, and during the charging process, the sawtooth wave signal gradually rises.

[0263] The value of the sawtooth wave signal can be calculated based on the following formula:

[0264]

[0265] where vsaw is the sawtooth wave signal, I0 is the third current, that is, the current corresponding to the first current source 211, Tpfm_chr is the charging period, and Tpfm_chr is the third charge of the first capacitor 213.

[0266] When the sawtooth wave signal is compared with the first electrical signal threshold value of the positive input terminal and the negative input terminal of the first comparator 214 CMP1, when the sawtooth wave signal is greater than the first electrical signal threshold value, the output of the first comparator 214 CMP1 is 1, pfm_chr passes through the first reset - set flip - flop 215 - 21 composed of the first NOR gate and the second NOR gate and the second inverter 215 - 3, the fourth inverter 215 - 5 and the fifth inverter 215 - 6 and then outputs a low level. At the same time, Vctr = 1, controlling the first switching transistor 212 to turn off and the second switching transistor 221 to turn on, and the first capacitor 213 starts to discharge.

[0267] Continue to refer to Figure 2 During the discharging process, the turning point adjustment circuit 220 controls the discharging current of the first capacitor 213.

[0268] When the sawtooth wave signal at the positive input terminal of the first amplifier 222 is greater than the initial turning voltage at the negative input terminal of the first amplifier 222, the current corresponding to the third current source 224 is output, and the current corresponding to the fourth current source 225 is obtained through current mirroring to obtain the first current, where the first current is the sum of the current corresponding to the second current source 223 and the current corresponding to the fourth current source 225.

[0269] When the sawtooth wave signal at the positive input terminal of the first amplifier 222 is not greater than the initial turning voltage at the negative input terminal of the first amplifier 222, the third current source 224 is gradually turned off based on the difference between the sawtooth wave signal and the initial turning voltage until the third current source 224 becomes 0 and the fourth current source 225 also becomes 0, obtaining the second current, where the second current is the current corresponding to the second current source 223.

[0270] According to the frequency adjustment system of the switching power supply provided by the embodiments of the present application, by setting the turning point adjustment circuit 220, the discharging current of the target capacitor is effectively adjusted based on the correlation between the sawtooth wave signal generated by the pulse frequency modulation oscillator circuit 210 and the initial turning voltage, so as to adaptively adjust the discharging time of the target capacitor. The structure is simple and easy to implement, and the cost is low.

[0271] As Figure 4 shown, in some embodiments, the frequency adjustment system of the switching power supply may further include: a pulse frequency modulation signal generation circuit 230.

[0272] In this embodiment, the pulse frequency modulation signal generation circuit 230 controls the conduction and disconnection of the power transistor.

[0273] Continue to refer to Figure 2 In some embodiments, the pulse frequency modulation signal generation circuit 230 may further include: a second comparator 231, a third NOR gate 232, a second set-reset flip-flop 233, and a sixth inverter 234.

[0274] In this embodiment, the positive input terminal of the second comparator 231 is connected to the drain of the first switching transistor 212.

[0275] The negative input terminal of the second comparator 231 is connected to the output terminal of the multiplexer 240.

[0276] The input terminals of the multiplexer 240 include: a first input port and a second input port.

[0277] The first input port is connected to the load voltage.

[0278] The second input port is connected to a second electrical signal threshold.

[0279] The first input port of the third NOR gate 232 is connected to the output terminal of the second comparator 231.

[0280] The second input port of the third NOR gate 232 is connected to a first pulse frequency modulation signal, and the first pulse frequency modulation signal can be represented as pfm_chr.

[0281] The input terminals of the second set-reset flip-flop 233 are respectively connected to the output terminal of the third NOR gate 232 and the second input terminal of the third NOR gate 232.

[0282] The input terminal of the sixth inverter 234 is connected to the output terminal of the second set-reset flip-flop 233.

[0283] The output terminal of the sixth inverter 234 outputs a pulse frequency signal, and the pulse frequency signal can be represented as pfm.

[0284] The first pulse frequency modulation signal is used to control the output pulse frequency signal to be at a high level when the first capacitor 213 is in a discharging state.

[0285] The first pulse frequency modulation signal is the reset signal of the second set-reset flip-flop 233.

[0286] The reset signal and the first pulse frequency modulation signal pass through the second set-reset flip-flop 233 and the sixth inverter 234 to obtain the pulse frequency signal.

[0287] During the actual execution process, when the sawtooth wave signal is greater than the second electrical signal threshold, as Figure 2 shown, the second comparator 231 CMP2 outputs Vo2 = 1 and pfm = 0. At this time, the power transistor can be controlled to turn off.

[0288] When the sawtooth wave signal is not greater than the second electrical signal threshold, as Figure 2 shown, the second comparator 231 CMP2 outputs Vo2 = 0. When Vo2 = 0 and pfm_chr = 0, the set signal is 1. After passing through the second set-reset flip-flop 233 and the sixth inverter 234, the pulse frequency signal pfm = 1. At this time, the power transistor can be controlled to turn on.

[0289] According to the frequency regulation system of the switching power supply provided by the embodiment of the present application, by setting the correlation between the sawtooth wave signal and the second electrical signal threshold by the second comparator 231, the on-off state of the power transistor can be effectively controlled, the structure is simple and easy to implement, and the cost is low.

[0290] During the actual execution process, the waveform in the frequency regulation system of the switching power supply is as Figure 5 shown. leb is the front edge blanking signal of DRV. There is a shielding signal for t1 time when DRV is turned on, and the rest of the time is at a high level. In the method for regulating the frequency of the switching power supply provided by the embodiments of the present application, the execution subject can be a frequency regulation device of the switching power supply. In the embodiments of the present application, taking the frequency regulation device of the switching power supply executing the frequency regulation method of the switching power supply as an example, the frequency regulation device of the switching power supply provided by the embodiments of the present application is described.

[0291] The embodiments of the present application also provide a frequency regulation device for a switching power supply.

[0292] As Figure 9 shown, the frequency regulation device of the switching power supply includes: a first processing module 910, a second processing module 920, a third processing module 930, a fourth processing module 940, and a fifth processing module 950.

[0293] The first processing module 910 is configured to control the charge and discharge state of the target capacitor based on at least one of the front edge blanking signal, the sawtooth wave signal generated by the target capacitor in the working state, and the first electrical signal threshold; the charge and discharge state includes: a charging state or a discharging state;

[0294] The second processing module 920 is configured to, when the charge and discharge state of the target capacitor is the discharging state, adjust the discharge current of the target capacitor based on the sawtooth wave signal and the initial turning voltage to change the frequency of the switching power supply;

[0295] The third processing module 930 is configured to, when the charge and discharge state of the target capacitor is the discharging state, control the on-off state of the power tube based on the sawtooth wave signal, the load voltage, and the second electrical signal threshold.

[0296] According to the frequency regulation device of the switching power supply provided by the embodiments of the present application, by one or more of the front edge blanking signal, the sawtooth wave signal generated by the target capacitor in the working state, and the first electrical signal threshold, the charge and discharge state of the target capacitor is controlled, and during the discharging process of the target capacitor, the discharge current is adjusted based on the sawtooth wave signal and the initial turning voltage, so as to adaptively adjust the discharge rate of the target capacitor, thereby being able to solve the technical problem that the turning points of the rise and fall of the load voltage are different due to the delay of the one-bit data selector, affecting the valley distribution in the full load range. On this basis, by regulating the frequency of the switching power supply based on the turning point, the frequency of the switching power supply can be adaptively changed based on the different loads, so as to realize the adaptive transition of the switching period with the change speed of the sawtooth wave signal before and after the turning point, improve the system stability, and extend the service life of the device.

[0297] In some embodiments, the second processing module 920 may further be configured to:

[0298] When the sawtooth wave signal is greater than the initial turning voltage, adjust the discharge current to a first current to change the frequency of the switching power supply;

[0299] When the sawtooth wave signal is not greater than the initial turning voltage, adjust the discharge current to a second current to change the frequency of the switching power supply; wherein, the first current is greater than the second current, and the first switching power supply frequency corresponding to the first current is greater than the second switching power supply frequency corresponding to the second current.

[0300] In some embodiments, the second processing module 920 may further be configured to:

[0301] Obtain the operating parameters of the target capacitor in the charging state and the operating parameters in the discharging state at each acquisition moment within the target charge-discharge cycle respectively; the operating parameters in the discharging state include: the first charge and the first current or the operating parameters in the discharging state include: the second charge and the second current;

[0302] Based on the operating parameters of the target capacitor in the charging state, the first charge and the first current of the target capacitor in the discharging state, obtain a first functional relationship between the sawtooth wave signal and the switching period;

[0303] Based on the operating parameters of the target capacitor in the charging state, the second charge and the second current of the target capacitor in the discharging state, obtain a second functional relationship between the sawtooth wave signal and the switching period;

[0304] Based on the first functional relationship and the second functional relationship, determine the frequency of the switching power supply.

[0305] In some embodiments, the third processing module 930 may further be configured to:

[0306] When the load voltage is greater than the second electrical signal threshold, obtain a pulse frequency signal based on the sawtooth wave signal and the load voltage;

[0307] When the load voltage is not greater than the second electrical signal threshold, obtain a pulse frequency signal based on the sawtooth wave signal and the second electrical signal threshold;

[0308] When the pulse frequency signal is at a high level, control the power transistor to conduct;

[0309] When the pulse frequency signal is at a low level, control the power transistor to turn off.

[0310] In some embodiments, the first processing module 910 may further be configured to:

[0311] When the front edge blanking signal is at a low level, control the target capacitor to charge;

[0312] When the leading edge blanking signal is at a high level and the sawtooth wave signal is greater than the first electrical signal threshold, control the target capacitor to discharge.

[0313] The frequency adjustment device of the switching power supply in the embodiments of the present application can be a frequency adjustment system of the switching power supply, or can be an electronic device communicatively connected to the frequency adjustment system of the switching power supply, or can be a component in the frequency adjustment system or electronic device of the switching power supply, such as an integrated circuit or a chip. The electronic device can be a terminal or other devices other than the terminal. Exemplarily, the electronic device can be a mobile phone, a tablet computer, a laptop computer, a handheld computer, a vehicle-mounted electronic device, a Mobile Internet Device (MID), an augmented reality (AR) / virtual reality (VR) device, a robot, a wearable device, an ultra-mobile personal computer (UMPC), a netbook, or a personal digital assistant (PDA), etc., and can also be a server, a Network Attached Storage (NAS), a personal computer (PC), a television (TV), a teller machine, or a self-service machine, etc. The embodiments of the present application do not make specific limitations.

[0314] The frequency adjustment device of the switching power supply in the embodiments of the present application can be a device with an operating system. The operating system can be an Android operating system, an IOS operating system, or other possible operating systems. The embodiments of the present application do not make specific limitations.

[0315] The frequency adjustment device of the switching power supply provided by the embodiments of the present application can implement Figure 1 , Figure 3 and Figures 5 to 8 the various processes implemented by the method embodiments. To avoid repetition, they will not be elaborated here.

[0316] In some embodiments, as Figure 10 shown, the embodiments of the present application further provide an electronic device 1000, including a processor 1001, a memory 1002, and a computer program stored on the memory 1002 and executable on the processor 1001. When the program is executed by the processor 1001, it implements the various processes of the above-mentioned method embodiments for adjusting the frequency of the switching power supply and can achieve the same technical effects. To avoid repetition, they will not be elaborated here.

[0317] It should be noted that the electronic devices in the embodiments of the present application include the above-mentioned mobile electronic devices and non-mobile electronic devices.

[0318] The embodiments of the present application further provide a non-transitory computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, it implements each process of the above-mentioned embodiment of the frequency regulation method of the switching power supply, and can achieve the same technical effects. To avoid repetition, it will not be elaborated here.

[0319] Among them, the processor is the processor in the electronic device described in the above embodiment. The readable storage medium includes computer-readable storage media, such as computer read-only memory ROM, random access memory RAM, magnetic disk or optical disc, etc.

[0320] The embodiments of the present application further provide a computer program product, including a computer program, which implements the above-mentioned frequency regulation method of the switching power supply when executed by a processor.

[0321] Among them, the processor is the processor in the electronic device described in the above embodiment. The readable storage medium includes computer-readable storage media, such as computer read-only memory ROM, random access memory RAM, magnetic disk or optical disc, etc.

[0322] The embodiments of the present application further provide a chip, which includes a processor and a communication interface. The communication interface is coupled to the processor, and the processor is used to run programs or instructions to implement each process of the above-mentioned embodiment of the frequency regulation method of the switching power supply, and can achieve the same technical effects. To avoid repetition, it will not be elaborated here.

[0323] It should be understood that the chip mentioned in the embodiments of the present application may also be referred to as a system-on-chip, system chip, chip system, or system-on-chip, etc.

[0324] It should be noted that in this text, the term "including", "comprising" or any other variant thereof is intended to cover non-exclusive inclusion, such that a process, method, article or device including a series of elements not only includes those elements but also other elements not expressly listed, or elements inherent to such process, method, article or device. Without further limitation, an element defined by the phrase "including one..." does not exclude the existence of additional identical elements in the process, method, article or device including such element. In addition, it should be pointed out that the scope of the methods and devices in the embodiments of the present application is not limited to performing functions in the order shown or discussed, and may also include performing functions in a substantially simultaneous manner or in a reverse order according to the functions involved. For example, the described methods may be performed in an order different from that described, and various steps may be added, omitted, or combined. Additionally, the features described with reference to certain examples may be combined in other examples.

[0325] Through the description of the above embodiments, those skilled in the art can clearly understand that the methods of the above embodiments can be implemented by means of software plus a necessary general hardware platform. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation. Based on such an understanding, the technical solution of the present application, in essence or the part that contributes to the related technology, can be embodied in the form of a computer software product. This computer software product is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disc) and includes several instructions for causing a terminal (which may be a mobile phone, computer, server, or network device, etc.) to execute the methods described in various embodiments of the present application.

[0326] The embodiments of the present application have been described above in conjunction with the accompanying drawings. However, the present application is not limited to the above specific embodiments. The above specific embodiments are merely illustrative and not restrictive. Those of ordinary skill in the art, under the inspiration of the present application and without departing from the purpose of the present application and the scope protected by the claims, can also make many forms, all of which fall within the protection scope of the present application.

[0327] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0328] Although embodiments of the present application have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present application. The scope of the present application is defined by the claims and their equivalents.

Claims

1. A method for adjusting the frequency of a switching power supply, characterized in that: include: Based on at least one of a leading edge blanking signal, a sawtooth wave signal generated by the target capacitor in a working state, and a first electrical signal threshold, the charge and discharge state of the target capacitor is controlled; the charge and discharge state includes: a charging state or a discharging state; the leading edge blanking signal is determined based on a feedback voltage of a load; When the charge and discharge state of the target capacitor is the discharge state, based on the sawtooth wave signal and the initial breakover voltage, adjusting the discharge current of the target capacitor to change the frequency of the switching power supply; When the charge and discharge state of the target capacitor is the discharge state, controlling the on and off state of the power tube based on the sawtooth wave signal, the load voltage and the second electrical signal threshold; The first electrical signal threshold is a preset value for controlling the charge and discharge state of the target capacitor; The second electrical signal threshold is a feedback voltage value corresponding to the maximum switching cycle; The controlling the charge and discharge state of the target capacitor based on at least one of the leading edge blanking signal, the sawtooth wave signal generated by the target capacitor in the working state, and the first electrical signal threshold comprises: When the leading edge blanking signal is at a low level, controlling the target capacitor to charge; When the leading edge blanking signal is at a high level and the sawtooth wave signal is greater than the first electrical signal threshold, the target capacitor is controlled to discharge.

2. The frequency adjustment method of the switching power supply according to claim 1, characterized in that: When the charge and discharge state of the target capacitor is the discharge state, adjusting the discharge current of the target capacitor to change the frequency of the switching power supply based on the sawtooth wave signal and the initial breakover voltage includes: When the sawtooth wave signal is greater than the initial breakover voltage, adjusting the discharge current to a first current to change the frequency of the switching power supply; When the sawtooth wave signal is not greater than the initial turning voltage, the discharge current is adjusted to a second current to change the frequency of the switching power supply; wherein the first current is greater than the second current, and the first switching power supply frequency corresponding to the first current is greater than the second switching power supply frequency corresponding to the second current.

3. The frequency adjustment method of the switching power supply according to claim 1, characterized in that: The frequency of the switching power supply is determined based on the following steps: Respectively obtaining the operating parameters of the target capacitor in the charging state and the operating parameters in the discharging state at each acquisition time in the target charging and discharging cycle; The operating parameters in the discharge state include: a first charge and a first current or the operating parameters in the discharge state include: a second charge and a second current; Obtaining a first functional relationship between the sawtooth wave signal and the switching period based on the operating parameters of the target capacitor in the charging state, the first charge of the target capacitor in the discharging state, and the first current; Based on the operating parameters of the target capacitor in the charging state, the second charge of the target capacitor in the discharging state, and the second current, a second functional relationship between the sawtooth wave signal and the switching period is obtained; Based on the first functional relationship and the second functional relationship, the frequency of the switching power supply is determined.

4. The frequency adjustment method of the switching power supply according to any one of claims 1 to 3, characterized in that: When the charge and discharge state of the target capacitor is the discharge state, controlling the on and off state of the power tube based on the sawtooth wave signal, the load voltage and the second electrical signal threshold includes: When the load voltage is greater than the second electrical signal threshold, a pulse frequency signal is obtained based on the sawtooth wave signal and the load voltage; When the load voltage is not greater than the second electrical signal threshold, a pulse frequency signal is obtained based on the sawtooth wave signal and the second electrical signal threshold; When the pulse frequency signal is at a high level, controlling the power tube to be turned on; When the pulse frequency signal is at a low level, the power tube is controlled to be disconnected.

5. A frequency regulation system for a switching power supply based on the frequency regulation method for a switching power supply according to any one of claims 1 to 4, characterized in that: include: a pulse frequency modulation oscillator circuit, the pulse frequency modulation oscillator circuit being used to control the charge and discharge state of the target capacitor based on at least one of the leading edge blanking signal, the sawtooth wave signal generated by the target capacitor in the working state, and the first electrical signal threshold; A turning point adjustment circuit, the turning point adjustment circuit is connected to the pulse frequency modulation oscillator circuit; the turning point adjustment circuit is used to adjust the discharge current to change the frequency of the switching power supply based on the sawtooth wave signal and the initial turning voltage in the target capacitor discharge state; a processing module, wherein the processing module is connected to the pulse frequency modulation oscillator circuit and the turning point adjustment circuit respectively; The controlling the charge and discharge state of the target capacitor based on at least one of the leading edge blanking signal, the sawtooth wave signal generated by the target capacitor in the working state, and the first electrical signal threshold comprises: When the leading edge blanking signal is at a low level, controlling the target capacitor to charge; When the leading edge blanking signal is at a high level and the sawtooth wave signal is greater than the first electrical signal threshold, the target capacitor is controlled to discharge.

6. The frequency regulation system of the switching power supply according to claim 5, characterized in that: The pulse frequency modulation oscillator circuit comprises: A first current source, wherein an input terminal of the first current source is connected to a voltage; A first switch tube, wherein a source of the first switch tube is connected to an output end of the first current source; A first capacitor, wherein an input end of the first capacitor is connected to a drain of the first switch tube; and an output end of the first capacitor is grounded; A first comparator, wherein the positive input terminal of the first comparator is connected to the drain of the first switch tube; and the negative input terminal of the first comparator is connected to the first electrical signal threshold; A first logic control module, wherein an input end of the first logic control module is connected to an output end of the first comparator, and an output end of the first logic control module is connected to a gate of the first switch tube.

7. The frequency regulation system of the switching power supply according to claim 6, characterized in that: The first logic control module includes: A first inverter; an input end of the first inverter is connected to the leading edge blanking signal; a first reset-set trigger; an input end of the first reset-set trigger is connected to an output end of the first inverter and an output end of the first comparator respectively; A second inverter; an input end of the second inverter is connected to an output end of the first reset-set trigger; a third inverter; the input end of the third inverter is connected to the output end of the second inverter; the output end of the third inverter is connected to the gate of the first switch tube; a fourth inverter; an input end of the fourth inverter being connected to an output end of the second inverter; a fifth inverter; the input end of the fifth inverter is connected to the output end of the fourth inverter; the output end of the fifth inverter outputs a first pulse frequency modulation signal.

8. The frequency regulation system of the switching power supply according to claim 7, characterized in that: The first reset-set trigger comprises: A first NOR gate; a first input port of the first NOR gate is connected to the output end of the first inverter; an output port of the first NOR gate is connected to the input port of the second inverter; a second NOR gate; a first input terminal of the second NOR gate is connected to an output terminal of the first NOR gate; a second input terminal of the second NOR gate is connected to an output terminal of the first comparator; and an output terminal of the second NOR gate is connected to a second input terminal of the first NOR gate.

9. The frequency regulation system of the switching power supply according to claim 8, characterized in that: The turning point adjustment circuit comprises: a second switch tube, wherein the drain of the second switch tube is connected to the drain of the first switch tube; and the gate of the second switch tube is connected to the output end of the first logic control module; A first amplifier; a positive input terminal of the first amplifier is connected to the drain of the first switch tube, and a negative input terminal of the first amplifier is connected to the initial breakover voltage; a second current source, wherein an input end of the second current source is connected to a source of the second switch tube, an output end of the second current source is grounded, and during the discharge process of the target capacitor, the second current source is in an on state; a third current source, wherein an input end of the third current source is connected to an output end of the first amplifier; and an output end of the third current source is grounded; A fourth current source, wherein an input end of the fourth current source is connected to a source of the second switch tube; an output end of the fourth current source is grounded; and the fourth current source and the third current source are mirrored based on a target ratio.

10. A chip, comprising a processor and a communication interface, wherein the communication interface is coupled to the processor, characterized in that: The processor is used to run a program or an instruction, and when the processor executes the program or the instruction, the frequency adjustment method of the switching power supply according to any one of claims 1 to 4 is implemented.

11. A non-transitory computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the frequency adjustment method of the switching power supply according to any one of claims 1 to 4 is implemented.

Images